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Home My WebLink About20240065.tiffWELD COUNTY CODE ORDINANCE 2023-16 IN THE MATTER OF REPEALING AND REENACTING, WITH AMENDMENTS, CHAPTER 8 PUBLIC WORKS, OF THE WELD COUNTY CODE BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF THE COUNTY OF WELD, STATE OF COLORADO: WHEREAS, the Board of County Commissioners of the County of Weld, State of Colorado, pursuant to Colorado statute and the Weld County Home Rule Charter, is vested with the authority of administering the affairs of Weld County, Colorado, and WHEREAS, the Board of County Commissioners, on December 28, 2000, adopted Weld County Code Ordinance 2000-1, enacting a comprehensive Code for the County of Weld, including the codification of all previously adopted ordinances of a general and permanent nature enacted on or before said date of adoption, and WHEREAS, the Weld County Code is in need of revision and clarification with regard to procedures, terms, and requirements therein. NOW, THEREFORE, BE IT ORDAINED by the Board of County Commissioners of the County of Weld, State of Colorado, that Chapter 8 of the Weld County Code be, and hereby is, repealed and re-enacted, with amendments, to read as follows. CHAPTER 8 PUBLIC WORKS ARTICLE I - Snow and Ice Policy Amend Sec. 8-1-20. Snow watch plan. • A. During normal working hours, sanding and/or plowing operations may be initiated by the 2 Director of Public Works or the on -duty Snow Boss. 81 B. In order to ensure that sanding/plowing operations are initiated in a timely manner at other r than normal working hours, feedback regarding road conditions by Sheriffs Office or-■ Deputies and any other agency, including the Colorado State Patrol, shall be sent to the Weld County Regional Communications Center (WCRCC). The WCRCC shall then notify in03 the scheduled on -duty Snow Boss. The Snow Boss shall then initiate sanding/plowing NI —.5 operations accordingly. ..ms e ,,,,E, Amend Sec. 8-1-30. Snow removal priorities. ..a 22 sc 5 A. Priorities: Clearing of roads shall occur according to the following order of priority: wni� ��.1 �.1 1. thru 6. — No change. .oa N ai WA o`er pr PAGE 1 cc:c--S(sG/c - 4944675 Pages: 1 of 285 2024-0065 Imo"� 02/15/2024 12:24 PM R Fee:$0.00 AcT0..)6FL�A/c�/So), Carly Kw s, Clerk and Recorder,' Weld County , Cs bA%5 Pw Wt / / ORD2023-16 Ili dO NI IIIIVI IMMI .� lLVII5 HI dill 03 /07/21-i 7. Collector roads. 8. Local roads, including subdivisions and unincorporated towns. B. Communications Command and control. 1. — No change. 2. Control of operations shall be exercised at the Public Works Department Operations Center (PWDOC). Communications between Snow Boss and operators shall be according to the following methods: 1) County Radio System; 2) cell phone; 3) CB radio. The Director of Public Works shall be in charge of snow removal operations and shall staff the PWDOC as necessary to carry out operations efficiently. This authority shall be delegated to the assigned Snow Bosses. 3. Any calls for emergency services received at the PWDOC shall be forwarded to the appropriate agency. 4. All incoming calls regarding snow removal or emergencies shall be routed to the PWDOC from dispatch or in-house Public Works staff. C. Operations. 1. — No change. 2. If weather information indicates that operations are anticipated in advance of the approaching storm, the Director of Public Works shall direct specific operators to be at work and ready to commence operations as soon as practical. If more than two (2) days of continuous operations are anticipated, no operator shall work more than twelve (12) hours in a day without approval of the Director of Public Works. 3. Status of all snow removal operations shall be maintained at the PWDOC. Reports shall be made to the Public Works Emergency Notification Group intermittently throughout the snow event. These reports shall be directed by the Director of Public Works or on -duty Snow Boss. 4. — No change. 5. If an abandoned vehicle is blocking the roadway, the operator shall radio in the location, license plate number and description of the vehicle to the PWDOC. The PWDOC shall contact the Regional Communications Center, informing the Dispatcher that a hazard exists and the vehicle should be removed from the County road right-of-way. Dispatch shall contact the Weld County Sheriffs Office for appropriate action. 6. No school property or private roads or driveways off the County rights -of -way shall be cleared by County equipment, with the following exceptions: PAGE 2 4944675 Pages: 2 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO ■III F111:itIlTY AVON 2024-0065 ORD2023-16 a. If requested in writing, by a school district, and approved in advance by the Board of County Commissioners. b. — No change. 7. Plow trucks shall primarily be used to remove snow and ice on paved roads and have designated routes or zones but may be assigned otherwise as needed. 8. Repair and maintenance of all Public Works equipment shall be furnished by the Weld County Department of Fleet Services during a snow event. Personnel shall be on standby or on duty, as directed by the Director of Fleet Services. 9. — No change. D. Planning and preparation. 1. All supervisors of units providing snow removal are responsible for ensuring that equipment is ready and personnel are briefed on their duties. Prior to a snow event, each piece of equipment shall be inspected with its plow and spreader to ensure readiness. All other equipment, such as tire and tow chains, route maps and vehicle lights, shall also be inspected at this time. 2. Fuel stocks at outlying satellite facilities shall be monitored by the individual zone operators immediately prior to a snow event and status reported to Fleet Services. If a fuel delivery is necessary during a snow event, the Snow Boss may direct the delivery route be cleared on a priority basis. Amend Sec. 8-1-40. Contracting for additional resources. In cases of EXTREME EMERGENCY and where County resources cannot maintain safe traveling conditions, it may be necessary to obtain additional equipment from Contractors. A. Authorization for contract. 1. - No change. 2. The Director of Public Works or authorized agent of the Board of County �Commissioners shall follow the emergency procurement process in Chapter 5 of 31�2 the Weld County Code. oho B. Contracted equipment command and control. Control of contractor equipment shall be exercised through the PWDOC. The Director of Public Works or the on -duty Snow Boss a� �t shall coordinate and control the efforts of all contractor equipment. O►a d-53-1 ~U� �hIw N p, PAGE 3 4944675 Pages: 3 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kedges, Clerk and Recorder, Weld County , CO VIII IVCIPIRligilrfliCIAX II 2024-0065 ORD2023-16 C. Operations. 1. County and contracted workforces shall be employed to maximize the efficiency of the snow removal operation. Contracted equipment may be paired with County equipment to take advantage of County radio control. 2. As soon as it is apparent that County forces can manage resources for the remaining snow event, the Director of Public Works shall terminate contractor operations. 3. — No change. 4. Contractors shall submit invoices to the Department of Public Works to receive payment for time and costs. Amend Sec. 8-1-50. Response plan for extreme snow and ice events. The following policy sets in place criteria for managing snow and ice removal efforts on the County roadway network during extreme weather events. A. Weather event definitions. Snow events are categorized using a storm level scale based on reports from the field as to the severity of conditions, as well as other methods, including forecasts, satellite images, weather stations and common sense. With the vast expanse of Weld County, storm levels may vary depending on conditions in that area. The levels of storms are defined below: 1. Level 1: Extreme weather conditions. Snow removal efforts shall cease, and equipment shall retreat to designated recovery stations located throughout the County for further instructions and redeployment as conditions warrant. Level 1 may be declared by the on -duty Snow Boss with the concurrence of the Director of Public Works, the Commissioner Coordinator or Alternate Commissioner 2 Coordinator for Public Works. When redeployed, resources shall be committed to predetermined priority snow routes. Notification of a Level 1 Condition or any road closures shall be communicated to the Regional Communications Center and the Public Works Emergency Notification List. 2. Level 2: Snow Removal Operations shall focus on snow removal priorities as �mm�T identified in Section 8-1-30(A). Some roads may be closed, and traffic rerouted so Nm3� snow removal vehicles can operate unimpeded by traffic. The on -duty Snow Boss ,�� shall refer to Section 8-1-30 of this Code. Oe� LLV0 e=� 3. Level 3: Snow Removal Operations shall focus on all roads. The effort and is 2 resources expended shall vary depending on accumulation and drifting conditions. 1The on -duty Snow Boss shall refer to Section 8-1-30 of this Code. • N p,� N`. 6,aM :6;U - PAGE 4 4944675 Pages: 4 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO Ill I1,rdl;rawAVlO IA till 2024-0065 ORD2023-16 Amend Sec. 8-1-60. No waiver of governmental immunity. No term or condition set forth in this Article shall be construed or interpreted as a waiver, express or implied, of any of the immunities, rights, benefits, protections, or other provisions of the Colorado Governmental Immunity Act, Section 24-10-101, et seq., C.R.S., as applicable. Furthermore, nothing set forth in this Article shall be construed as creating a duty of care upon any individual or party. Add Sec. 8-1-70. No expectation of service to any specific person or property. The provisions stated in this Article are not intended to, nor shall they, create in any specific person or property a right to expect a certain level of service, even if such level of service is described herein. Amend ARTICLE II — Improvements Agreements Sec. 8-2-10. Reserved. Sec. 8-2-20. Improvements Agreements. Depending on the land USE project, there are several different types of possible Improvements Agreements that may be required. It is the intent that Improvements Agreements will be in place prior to final approval of the use. Construction of any safety improvements are intended to be completed prior to operation or issuance of building permit(s). A. An Improvements Agreement reference may be used interchangeably and include, but is not limited to, immediate off -site and/or on -site improvements, future triggered improvements, and road maintenance criteria. (All categories may or may not include a proportional share based on locations and existing background traffic.) B. Agreement Types include: 1. Improvements Agreement (IA). This agreement is for projects that include future triggered improvements. Typically includes a standard road maintenance section for items such as dust suppressant or pavement damage repair. If applicable, will include a proportional share component for any future improvements done by the County on the haul or travel route. 2. Offsite Improvements Agreement (OFFSIA). These agreements include immediate off -site improvements. Immediate safety improvements may include, but are not limited to, adding auxiliary lanes, intersection improvements, paving of gravel road, or widening of a road. These agreements will require project and warranty collateral and will also include all components described in the improvements' agreements. PAGE 5 4944675 Pages: 5 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppes, Clerk and Recorder, Weld County , CO 2024-0065 ORD2023-16 3. On -Site Improvements Agreement (ONSIA). These agreements require immediate on -site improvements intended for public use but privately maintained, which may include, but are not limited to, dedication of rights -of -way for public use, construction of an internal roadway, and/or construction of irrigation or stormwater ponds. 4. Road Maintenance Agreement (RMA). A Road Maintenance Agreement includes items addressing routine road maintenance, including but not limited to, dust suppressant if on a gravel road and pavement damage repair if on a paved road. There will also be a proportional share component for typical road maintenance improvements performed by the County specifically identified to the haul and travel routes related to the project. 5. Road Maintenance During Construction (RMCA). These agreements are similar to the Road Maintenance Agreement but are limited in time. Often used for transmissions lines, solar energy facilities and other land use projects where the heavy traffic impact on the roads is limited to the construction of the facility/use. These agreements will still include a proportional share component for routine road maintenance improvements performed by the County on the haul and travel routes related to the project. Pre and post construction inspections are required for these agreements. Sec. 8-2-30. Collateral. A. Improvements Agreements requiring collateral as financial assurance that the obligations of the Agreement will be completed (including, but not limited to, Subdivision and Development Improvements Agreements for major and minor subdivisions and Development Improvements Agreements for Planned Unit Developments) shall generally conform to this Article II. B. The County requires applicants to provide acceptable collateral to guarantee all of their obligations under the associated Improvements Agreement in the following forms: (1) Project Collateral for completion of all improvements described in the Improvements Agreement; and (2) Warranty Collateral to ensure all public improvements uphold their functionality during the warranty period. C. All references to "Acceptance of Improvements" shall refer to the County confirming completion of the improvements according to the accepted Construction Plans. By accepting any improvement, the County does not thereby accept it for purposes of future maintenance, nor does the County accept any present or future responsibilities or obligations relative to the improvements. D. The Board of County Commissioners reserves the right to reject collateral that it deems inappropriate or insufficient. E. Release of collateral is the sole discretion of the Board. PAGE 6 4944675 Pages: 6 of 283 0 CarlygKapp ',024 1C1• k :24 alnd Recorrder,,OWed County , CO licrOrthiMilifi PO II I'M' AGgilitic 11 II 2024-0065 ORD2023-16 Sec. 8-2-40. Acceptable types of collateral. The three (3) types of collateral listed below are acceptable to the County: A. An irrevocable letter of credit from a federal- or state -licensed financial institution that has at least a three -star rating given by Bauer Financial consistent with a sample form supplied by the County. The Board may require the applicant to obtain replacement collateral if the rating of the financial institution providing the collateral drops below this level, which shall be submitted within sixty (60) days of the Board's notice to the applicant that the rating has fallen and that the collateral must be replaced. The applicant may not terminate existing collateral until replacement collateral has been secured. 1. The letter of credit shall provide for payment upon demand to the County if the applicant has not performed the obligations specified in the Improvements Agreement and the issuer has been notified of such default or if, after the County has received notice that the letter will not be renewed as set forth below, the County notifies the issuer that the applicant has not provided adequate replacement collateral and the County intends to demand payment, regardless of whether applicant is then in default. 2. The issuer of the letter of credit shall guarantee that, at all times, the unreleased portion of the letter of credit shall be available to the County for the purpose of completing the uncompleted improvements enumerated in the Improvements Agreement. 3. The letter of credit must stipulate that it will automatically renew and shall remain in full force and effect until released by action of the Board, or until after the Board has received a minimum of sixty (60) days' written notice from the issuer of the letter of credit of the pending expiration. The notice shall be sent by certified mail to the Clerk to the Board. B. A surety bond given by a corporate surety authorized to do business in the State and having at least a B+ rating given by A.M. Best. The Board may require the applicant to obtain replacement collateral if the rating of the financial institution providing the collateral drops below this level, which shall be submitted within sixty (60) days of the Board's notice to the applicant that the rating has fallen and that the collateral must be replaced. The applicant may not terminate existing collateral until replacement collateral has been secured. C. A cash deposit made with the Board. Sec. 8-2-50. Project Collateral. A. The value of Project Collateral submitted to the County must be equivalent to one hundred twenty-five percent (125%) of the value of the improvements identified on the accepted Construction Cost Estimate exhibit to the Improvements Agreement. PAGE 7 4944675 Pages: 7 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clark and Recorder, Weld County , CO lIII NUMMI I4%1 /1M I54PiAIJk 1I II 2024-0065 ORD2023-16 B. The Project Collateral shall be submitted with a signed Improvements Agreement including all required exhibits. The complete submittal is subject to final approval by the Board and shall be recorded at the Office of the Clerk and Recorder by the Clerk to the Board upon approval. C. Unless otherwise set forth in the Improvements Agreement Construction Schedule exhibit, the improvements shall be completed within three (3) years of execution of the Improvements Agreement. Otherwise, the Board, at its discretion, may make demand on all or a portion of the collateral and complete the improvements or partially complete the improvements, which may include, at the Board's discretion, contracting to have the work completed by a third party. D. Project Collateral may be provided separately for on -site and off -site Improvements. Sec. 8-2-60. Release of Project Collateral. A. Upon completion of the improvements in accordance with the Improvements Agreement, the developer shall notify Weld County, so staff may inspect the improvements. B. Following preliminary approval by County staff, the developer shall present a Statement of Substantial Compliance signed and stamped by a Colorado Professional Engineer licensed to do business in the state and a request for release of collateral. The Statement of Substantial Compliance shall certify the work has been completed in substantial compliance with approved plans and specifications, or that any material deviations have received prior written acceptance from the County, and the engineer or his or her representative has made regular on -site inspections during the course of construction and the construction plans utilized are the same as those accepted by the County. C. "As -built" plans are required for all public improvements, which may include, but are not limited to, public rights -of -way, permanent easements, or on -site drainage features. "As -built" plans shall be stamped by a Colorado Professional Engineer licensed to do business in the state certifying the project is in substantial compliance with the plans and specifications and shall be submitted at the time the letter requesting release of collateral is submitted. D. For improvements to public rights -of -way or permanent easements, materials test results must be submitted for all phases of the project, as per the Colorado Department of Transportation (CDOT) Schedule for minimum materials sampling, testing, and inspections found in the CDOT Materials Manual. E. If applicable, a letter of acceptance of maintenance and responsibility identifying all improvements are in place and in accordance with the approved plans submitted from the appropriate utility company, fire, water, and/or other special district, and/or municipality for any utilities and improvements shall be submitted with the request for release of collateral. F. The written request for release of Project Collateral shall be accompanied by Warranty Collateral in accordance with Section 8-2-70, Warranty Collateral, below. PAGE 8 4944675 Pages: 8 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppes, Clerk and Reoorder, Weld County , CO ■III I �s��'�3NIuJ �ti1'�Ifl� �kM�� if irVIL' Ir+IA L 11111 2024-0065 ORD2023-16 G. County staff shall schedule the request for consideration by the Board at a regularly scheduled public Board meeting and notify the applicant of the hearing date and time. The Project Collateral shall be released after final written acceptance by the Board. Sec. 8-2-70. Warranty Collateral. A. Warranty Collateral shall be in an amount equal to fifteen percent (15%) of the value of the improvements as shown in the Improvements Agreement, excluding improvements fully accepted for maintenance by the responsible governmental entity, special district, or utility company. B. The warranty period shall be two (2) years from the date of the Board's consent to release the Project Collateral. Sec. 8-2-80. Release of Warranty Collateral. A. Following the conclusion of the warranty period, the applicant shall submit a written request for release of the Warranty Collateral to Weld County. B. County staff shall inspect the improvements. If the improvements need mitigation or repairs are required, said work must be completed prior to release of the Warranty Collateral. In the event an applicant fails to adequately repair improvements associated with the Improvements Agreement, the County shall have the authority to pursue, at its sole discretion, Warranty Collateral to the extent necessary to complete the repairs in order to preserve public interest. C. If no improvements require mitigation or repairs, County staff shall schedule the request for consideration by the Board at a regularly scheduled public Board meeting and notify the applicant of the hearing date and time. The Warranty Collateral shall be released after final written acceptance by the Board. Sec. 8-2-90. Proportional Share Process for Improvements Agreements. A. The proportional share process is an important tool used by the County to identify the shared cost of safety improvements for existing and new development to mitigate impacts to the county road system. 8nr B. Weld County uses the Equivalent Single Axle Load (ESAL) methodology when calculating --a an Improvements Agreement proportional share. The ESAL methodology is a national Sy standard for normalizing traffic counts to reflect the actual damage caused by large am vehicles. The purpose of the methodology is to create the most reasonable and fair m.° method for analyzing traffic data and the impacts to county infrastructure. NB__ % 4 C. Weld County maintains a current list of approved and recorded Improvements °, Agreements. Annually, the Improvements Agreement haul, or travel routes are evaluated °'sk —.� to determine which roads will have proportional share costs for Weld County identified wE n# projects the next calendar year and therefore, what owners/land use permits will be •Qw-� dint. affected so they can be notified in advance. NamgPAGE 9 E®�.. 4944673 Pages: 9 of 283 2024-0065 �""- 02/16/2024 12:24 PM R Fee:$0.00 ORD2023-16 �mc4il� Carly Koppel, Clerk and Recorder, Weld County , CO VIII Kink' die I naiit:' hiiyliMix. kill II II D. Once the Improvements Agreement permit holders are identified, Development Review sends a courtesy letter notifying them of the anticipated proportional share associated with their use. This letter is meant to be general in nature and will not contain specific costs or percentages associated with the required contributions. It is meant to give permit holders preliminary notice that a project will be occurring in the upcoming calendar year. E. On or before December 31 of the year prior to the Weld County identified projects, the permit holder will receive another letter giving the proportional share percentage with supporting documentation. An estimated cost will also be provided at this time. F. Permit holder shall have the opportunity to review supporting documentation, review, comment and supplement the County's data, collection methodology and determinations. If the project is completed by the Public Works Department, the proportional share will be based on materials only. If the work is completed by a private contractor, the cost will be based on both materials and labor. G. The final cost will be based on actual costs of the work performed and will be invoiced to the permit holder at the completion of the project. H. The County's criteria for calculating the ESAL proportional share is identified in Appendix 8-Q. ARTICLE III - Culverts Add Sec. 8-3-10. Purpose. For the purpose of this Article, culverts may refer to, road culverts, driveway/access culverts, cross culverts, irrigation culverts, and similar structures that convey and maintain the natural flow of water carried in the roadside ditches. Amend Sec. 8-3-20. Installation of access culvert. A. The property owner shall pay the costs for materials for new road access culverts whenever the installation of a culvert is made necessary by the creation of a new access from private property to a County road, by any alteration of the natural flow of water across private property by the owner, or for any other reason created by any owner of private property. The culvert shall be installed according to Appendix 8-Q of the Weld County Engineering and Construction Criteria as to size and location in the County rights -of -way or other County property in which such culverts may be installed. Consideration of culvert sizing shall be based on the existing upstream and downstream culvert diameter size. The culvert size will be determined in accordance with standard engineering practices by Public Works Operations at the time of culvert installation. The property owner shall be responsible for cleaning the borrow or roadside ditch to the extent required to accommodate the road access culvert and ensure proper drainage. B. Property owner/user shall submit a Culvert Installation Form to Public Works for invoicing of the materials of the culvert installation. Property owner/user shall provide payment prior to culvert installation. The application form is available at Public Works. PAGE 10 4944675 Pages: 10 of 285 02/15/2024 12:24 PM R Fee:50.00 Carly Koppel, Clerk and Recorder, Weld County , CO ■III Ming gi lifinlel+Iatiii'glVIPAN LkYivh Bill 2024-0065 ORD2023-16 Amend Sec. 8-3-30. Maintenance. After county acceptance of the culvert installation, Weld County shall be responsible for the maintenance and repair of the road access and/or any related culvert. In the event of an emergency or if a hazardous situation is observed or detected, the property owner shall be notified and requested to provide an immediate remedy to the situation. If the property owner fails to react, the County shall correct the hazardous situation and may bill the property owner for all incurred expenses. Add Sec. 8-3-40. Maintenance of irrigation structures. The County's duty to maintain culverts, bridges or similar structures used for irrigation purposes shall be in accordance with the following statutory requirements: A. Section 43-5-305(1), C.R.S., which states as follows: "Any person or corporation owning or constructing any ditch, race, drain, or flume in, upon, or across any highway shall keep the highway open for safe and convenient travel by constructing culverts, bridges, or similar structures over such ditch, race, drain, or flume. When any ditch is constructed across, in, or upon any highway, the person owning or constructing such ditch shall construct a culvert, bridge, or similar structure long enough to conduct the water from shoulder to shoulder from such road or highway or of such greater length as the Board of County Commissioners having jurisdiction thereover may require, plans for the culvert, bridge, or similar structure having been approved in advance by the Board of County Commissioners. The Board of County Commissioners shall maintain the culvert, bridge, or similar structure after construction, in accordance with the provisions of Section 37-84-106, C.R.S." B. Section 37-84-106, C.R.S., which states as follows: "All bridges constructed over any ditch, race, drain, or flume, crossing any public highway, street, or alley, after construction, shall be maintained by and at the expense of the county or municipality in which the ditch, race, drain, or flume may be situated." 2 C. In the event of an emergency or if a hazardous situation is observed or detected, the o%- County shall notify the property owners/users to request the irrigation water be shut off in � conjunction with property owners/users schedule, in order to perform emergency repairs. a If Public Works identifies this road as an essential travel or haul route, or inadequate 3: detour route availability and the property owner/users fails to react, the County shall �aa correct the hazardous situation and may bill the property owner/user for any incurred aom •, expenses. i N -3 o � Amend Sec. 8-3-50. County Authority. ei IL '4.i''^ Remainder of Section — No change. � w sm \YL f2m aii PAGE 11 :VAN 4944675 Pages: 11 of 285 2024-0065 02/15/2024 12:24 PM R Fee:$0.00 ORD2023-16 Carly Koppas, Clark and Recorder, Wald County , CO X111MINACIR«I akiAWINIDA1i iii ARTICLE IV - Use of Borrow or Roadside Ditches Add Sec. 8-4-10. Purpose. Borrow or roadside ditches are intended to intercept surface water from agricultural fields or residential property. Roadside ditches are not intended to accommodate forced point source discharges. Tailwater ditches are not recognized as part of Weld County's conveyance system. Amend Sec. 8-4-20. Responsibilities. Whenever possible, the county shall try to separate agricultural farming operations out of the county road right-of-way, especially when located in a municipal separate storm sewer systems (MS4) area. Persons in the County who are currently using borrow/roadside ditches along County rights -of -way for agriculture uses, whether the consent to such uses was originally given expressly or implied, must adhere to the following conditions: A. thru C. — No change. D. Tailwater shall be controlled to prevent erosion and sedimentation of the borrow ditches. Add Sec.8-4-30. Maintenance. A. Public works prioritizes and maintains Roadside Ditches on a case -by -case basis, as needed, to remove sediment, debris, trash, or other encumbrance that may be impeding the proper flow of water. Landowner's or tenant's may contact Public Works to request an inspection of a Roadside Ditch. Public Works personnel will inspect and schedule the Roadside Ditch to be cleaned, if deemed necessary. In the event drainage water overflows a Roadside Ditch, Public Works personnel will inspect the Roadside Ditch and determine if action, such as ditch cleaning, is required or if the event produced excessive runoff beyond the capacity of the drainage system. B. Roadside ditches are intended to carry stormwater from county roads to natural drainage basins. The amount of stormwater a roadside ditch carries varies. For planning purposes, Weld County never assumes a roadside ditch can carry more water than five (5) cubic feet MI per second (cfs). 2 8m- C. Nonexclusive License Agreements (NELA's) for private irrigation structures located in county rights -of -way shall be done by separate Agreement on a case -by -case basis where -.. the Board grants a nonexclusive license to access, construct, operate, and/or maintain 8 ri. privately owned equipment within county road right-of-way/property. Nm3 Amend Sec. 8-4-40. Violations. o Say If the Board of County Commissioners determines that users are violating the above- -.,, E stated conditions, the Board may consider the revocation of its prior consent, whether express or ;._� implied. The revocation of consent may be entered by resolution of the Board of County ova " Commissioners, following notice to the owner and user (if the user can be determined), and a a i:= hearing held pursuant to the procedures for adjudicatory type hearings. The Director of Public Nin rnY PAGE 12 4944675 Pages: 12 of 285 ORD2023-16 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel' Clerk and Recorder, Weld County , CO INFORI I 1131111.clATIJINNit, Ili 11111 2024-0065 Works shall have the burden of showing, by a preponderance of evidence, that the owner and user have failed to comply with Section 8-4-20 herein. ARTICLE V - Cattle Guards Amend Sec. 8-5-10. Purpose. Person includes any individual, business or corporation, who is not a landowner, must demonstrate authority to act on behalf of the landowner prior to coordination with the county on the installation of cattle guards. Cattle guards are intended to restrict the movements of livestock and are not intended to be used for drainage and utility purposes. Amend Sec. 8-5-20. New installations/Relocation. Any person in the County who wishes to install a cattle guard on any County road may do so only upon the following conditions: A. Property owner/User shall submit a Cattle Guard Installation/Relocation Form to Public Works for invoicing of the cost of the materials of the Cattle Guard installation/relocation. Property owner/User shall provide payment prior to Cattle Guard installation/relocation. The application form is available at Public Works. B. The entire cost of installation or relocation of a cattle guard is paid by the person making the request, with the County doing the installation/relocation, or by requester with the County's written approval. Weld County will be responsible for maintenance and cleaning of Cattle Guards after installation is completed. C. The Department of Public Works shall be notified prior to installation/relocation of a cattle guard. An invoice will be sent and payment received in accordance with the written agreement form attached in Appendix 8-C of this Chapter. The Department of Public Works must receive the form at least thirty (30) days prior to the date of the installation/relocation. D. The agreement between the Department of Public Works and the person making the request, detailing the rights and obligations concerning the cost of the Cattle Guard shall be signed by the person making the application. Maintenance and repair of the cattle guards shall be Weld County's responsibility. E. Any cattle guard which is installed in County road rights -of -way must comply with any and all standards required by the Department of Public Works, including, but not limited to, the County's Specifications for Cattle Guard Installation. Amend Sec. 8-5-30. Maintenance. A. Any person who benefits from any cattle guard located upon any maintained County road has the responsibility to periodically inspect for maintenance, proper function and inspect for cleaning. The person must notify Public Works within the same five (5) working days in which the person obtains the knowledge of the need for maintenance. PAGE 13 4844675 Paris: 13 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel., Clerk and Recorder, Weld County , CO VIII IIIIII 2024-0065 ORD2023-16 Cattle guard maintenance includes, but is not limited to, the removal of all sand, dirt, silt and other solid debris which renders the cattle guard ineffective. The county deems a cattle guard cleaned when the space within the cement box and below the grate of the cattle guard are free of debris. Cattle Guard maintenance requests may be completed by the County within thirty (30) days of the request. B. The maintenance of any cattle guard on any maintained County road shall be the responsibility of the County. C. In the event a Cattle Guard is deemed, by the County, to be beyond maintenance or repair, the County shall replace the cattle guard at the county's expense. Delete Sec. 8-5-40. Delete Sec. 8-5-50. Delete Sec. 8-5-60. Amend Sec. 8-5-40. Vested right. No portion of these policies shall be considered to have vested any person with the right to a particular size of cattle guard. The County, upon a determination that road improvement or widening is necessary, may require replacement of existing cattle guards. The county is responsible for Cattle Guard costs. ARTICLE VI - Miscellaneous Provisions Amend Sec. 8-6-10. Gravel pits. The County shall obtain all required state and federal permits for Public Works operations. A. Gravel obtained from County permitted gravel sites shall not be sold or used for other than governmental purposes, except by specific authorization of the Board of County Commissioners. B. The County will acquire, in its name, all gravel mining permits for gravel mining on County - owned property. When the property is not owned by the County, the issue of the obligation to obtain, maintain and pay the costs of permits shall be addressed contractually. Delete Sec. 8-6-20. Reserved. Delete Sec. 8-6-30. Reserved. Delete Sec. 8-6-60. Reserved. PAGE 14 4944675 Pages: 14 of 285 02/1.00 Carly�Kopp� ,/2024 1 Clark and Recorder, 2,24 PM R O Wad County , CO IN 4411 111 2024-0065 ORD2023-16 Amend Sec. 8-6-70. Satellite Facility use. Gravel Road operators may park personal vehicles in satellite facilities while performing road maintenance work for the County. Any personal use of satellite facilities by County employees or any other individual except as specified above is prohibited. Amend Sec. 8-6-80. Satellite Facilities utilities and rents. When the County owns the satellite facility and a trailer pad, that item associated with the satellite facility will be provided at no cost. Other than as specifically stated herein, utilities of gas and electricity shall not be provided to any grader operator in the County. Each operator will be responsible for his or her own gas and electricity. Amend Sec. 8-6-100. Gravel road fugitive particulate emissions policy and procedure. A. General. Growth throughout the County has led to increased vehicular traffic on all roadways under the County's jurisdiction; as a result, a fugitive dust application may also be required for detour routes, or any other reason deemed appropriate by Public Works. B. Fugitive dust applications may be required if increased traffic on unpaved County roads has resulted in dissatisfaction with the levels of fugitive particulate emissions caused by vehicles traveling those roadways. The County must also make reasonable efforts within budgetary constraints to comply with regulations established by the State Air Quality Control Commission regarding this issue. In an effort to reasonably comply with air quality regulations, the policies and/or procedures set forth in this Section will be adhered to when considering requests for fugitive dust abatement. C. Responsibility for fugitive dust. The County -maintained roadway segments with Annual Average Daily Traffic (AADT) volumes exceeding two hundred (200) vehicles per day should be treated to inhibit fugitive dust at the expense of the County subject to available budgetary appropriations. The process for the determination of qualifying AADT volumes will be as outlined in Subsection D below. Roadway segments with AADT volumes below two hundred (200) vehicles per day may also be treated for fugitive dust at the expense of property owners in accordance with Subsection F of this Section. D. Procedures for determination of traffic volumes in conjunction with fugitive dust issues. 1. Routine counts. Traffic counts will be taken as needed on gravel roadway segments in areas of the County which are determined by the County to have significant growth trends. 2. — No change. 3. Traffic count procedure. If the AADT count exceeds two hundred (200) vehicles per day, the roadway segment will be recounted in ninety (90) calendar days using the methods noted above to confirm the original count. If this count is significantly below the two hundred (200) vehicles per day AADT, the roadway may not be treated by the County for fugitive dust control. When the County determines the PAGE 15 4944675 Pages: 15 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppee, Clerk and Recorder, Weld County , CO 2024-0065 ORD2023-16 VIII R&MM AIVaik ilIRikktir R NP4tJi 11111 use of weekend or partial weekend counts could assist in establishing a representative average daily traffic count when factored with weekday counts, the seventy -two-hour count may include those time periods. D. Determination of fugitive dust control mitigation. When a roadway segment meets the criteria for County mitigation, the County may, when practical and within budgetary constraints, select one (1) of the following alternatives to mitigate fugitive dust: 1. — No change. 2. Full depth treatment using dust control agents using no more than two (2) applications per year at the County's discretion. 3. Recycled asphalt treatment up to eight -inches (8") and may also include a dust control agent, per Public Works discretion. 4. Asphalt or concrete paving, based upon qualification though the Capital Improvement Project prioritization process. 5. Speed limit reductions. Delete 5. Periodic watering. The mitigation alternative and time of implementation will be based on budget and seasonal constraints. The County will confirm the need for continued mitigation on roadway segments by conducting traffic counts using the procedures noted above and maintaining historical traffic count records. Should the AADT on a road segment fall below two hundred (200) vehicles per day, dust control mitigation may be discontinued by Public Works. E. Private application. The County has no objection to individuals applying dust control chemicals to County roads at their own expense, provided that they agree to the following conditions: 1. — No change. 2. Private application shall not include used oil applications. 3. Dust control chemicals must be applied in such a manner that will not contaminate any roadside ditches. Therefore, any materials which may wash from the roadbed will not be suitable. 4. — No change. 5. All dust control agents used on County roads shall be approved for use by the Department of Public Works. 6. — No change. PAGE 16 4944675 Pages: 16 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopp.., Clerk and Recorder, Weld County , CO 2024-0065 ORD2023-16 �� NUS.rI"4 iLrWi.J�'�rlll��►�i1�'ll�'�ti� IK1HO14'4K YLV) E II l 7 All private application must be applied by a Weld County approved vendor, who must obtain a county right-of-way use permit. Amend Sec. 8-6-110. Survey monuments. A. — No change. B. In order to avoid having surveyors dig holes in paved road intersections to locate the monuments, the monument should be enclosed in a box which is kept at least one -quarter inch (1/4") below the roadway surface. 1. thru 5. — No change. C. For gravel roads, the monument shall be located at least one (1) foot below the roadway surface. D. On concrete paved roadways the monuments shall be surface mount type CDOT class section 629, type 5 (Brass) and shall be recessed 1/2" below the surface. Amend Sec. 8-6-130. Trees in rights -of -way. A. — No change. B. It is the policy of the County that when trees on private property begin to obstruct visibility on County roads, the property owner shall be given notice to trim the trees within a reasonable time. Remainder of section — No change. Delete Sec. 8-6-140. Reserved. Sec. 8-6-150. Road maintenance acceptance policy for public roads. Persons desiring to obtain County maintenance of public roads shall first address such request to the Board of County Commissioners for its consideration at one (1) of its regularly - scheduled business meetings. The person making the request shall be responsible to pay the entire cost of notification to owners and/or occupants of lands lying adjacent to the roadway. Such notification shall include a description of the request and shall set forth the time and place of the Board consideration. County maintenance of public roads may occur only if authorized by resolution of the Board of County Commissioners. Before a public road may be authorized by the Board for maintenance, the road must meet the following minimum conditions: A. and B. — No change. C. The width of the road right-of-way shall not be less than sixty (60) feet. D. The road shall serve a minimum of five (5) legal lots, which must be developed with residential, commercial or industrial improvements to be considered for acceptance. PAGE 17 4944673 Pages: 17 of 285 02/15/2024 12:24 PM R Fee:50.00 Carly Koppel, Clerk and Recorder, Weld County , CO Mi'WNLYVA II 2024-0065 ORD2023-16 Properties abutting the intersection of the road under consideration for acceptance and an existing publicly maintained road do not count toward the required five (5) lots. E. Any new road width shall be a minimum of twenty-six (26) feet of graveled surface or meet the minimum design guidelines for the anticipated traffic on the roadway segment being considered. F. The following shall be the minimum acceptable standards before a road is accepted for maintenance: 1. — No change. 2. Borrow ditches shall be a minimum of twenty-four (24) inches deep with 4:1 side slopes and graded to provide adequate drainage on a case -by -case basis. 3. All driveway side road borrow ditches shall be sufficient to carry the five-year storm or be a minimum of a fifteen -inch -diameter culvert or culvert size based on the upstream and downstream culvert size as determined by the Director of Public Works. Crossroad drainage structures shall be sufficient to carry the ten-year storm or be a minimum of a fifteen -inch culvert as determined by the Director of Public Works. 4. The Department of Public Works shall test and inspect the roadbed subgrade for structural adequacy and acceptable materials, in accordance with the most current versions of the CDOT Field Materials Manual, reference CP 23, and the Standard Specifications Book SECTION 203 EXCAVATION AND EMBANKMENT. 5. A minimum of four (4) inches of compacted surface gravel in accordance with Table 9-12 of the Weld County Engineering and Construction Criteria found in Appendix 8-Q. G. There shall be no fences or other obstructions within county road right-of-way. If cattle have cross -access to the roadway, a cattle guard shall be installed in accordance with - Article V above. 2 H. If a fence exists along the section line on which the road is to be built, relocation of the fence to the county road right-of-way lines shall be the responsibility of the sponsor(s) of the roadway project. T05 t: I. Reimbursement by the persons requesting authorization of County maintenance of public �� roads shall be made for acreage within the county road right-of-way included in an szN adjacent property Conservation Reserve Program (CRP) crop or which has an Vwig unharvested annual crop demolished by the roadway construction project. r'1 °%. Remainder of section — No change. 1a Y S � w N ✓ "Y PAGE 18 4844678 Pages : 18 of 285 2024-0065 � o�� 02/15/2024 12:24 PM R Fee:$0.00 ORD2023-16 Carly Kopp., Clark and R.00rder, Wald County , CO MU IOW frt om Y y 1I 111 Amend Sec. 8-6-170. Obstructions within county rights -of -way. The County reserves the right to maintain its road rights -of -way without obstructions located thereon. Obstructions include, but are not limited to, fences, trash cans, gates, landscaping materials, irrigation structures, and any structure that does not meet the intent of being constructed with breakaway materials, regardless of whether or not they are physically located on the traveled portion. Obstructions shall be removed from the County road rights -of - way upon request by the Department of Public Works. The total expense of the removal of any obstruction from a County road right-of-way will be paid by the person who installed the obstruction, or by the person exercising ownership or control over the obstruction. In the event such person does not remove the obstruction as requested, the County will remove the obstruction and bill the person responsible for the obstruction for any expenses incurred in its removal. This Section shall not alter any rights, responsibilities and/or penalties regarding the act of obstructing highways as set forth in Sections 18-9-107 and 43-5-301, C.R.S. Delete Sec. 8-6-180. Reserved. Amend ARTICLE VII - Signs and Pavement Markings Sec. 8-7-10. Purpose. The County's roads require certain pavement markings and signs per the Manual on Uniform Traffic Control Devices, and Colorado state statute. The pavement markings and signs are to serve the public interest in traffic safety. Sec. 8-7-20. Sign policy. A. The County sign shop shall produce signs for County -maintained roads in subdivisions, unincorporated areas and historic townsites; where the signs are produced pursuant to a separate intergovernmental agreement with a governmental agency; and for non -County - maintained roads upon request and payment of the cost of the (blue) signs by the persons making such requests. B. All signs placed in the County rights -of -way must conform to the Manual on Uniform Traffic Control Devices (MUTCD). No signs, except those installed by the County, shall be located within County rights -of -way and all signs adjacent to rights -of -way must meet applicable building and zoning codes. Sec. 8-7-30. Memorial signs. A. The memorial sign must be requested by the victim's family or other sponsor with the consent of the victim's family through an application. Upon submittal of a Roadside Memorial Sign Application with fee to the Department of Public Works, the County shall review application for acceptance. The application form is available at Public Works. 1. If accepted, the Department of Public Works shall construct, install, and maintain the requested roadside memorial sign for four (4) years after the date of installation. After four (4) years, the sign shall be removed and held for a period PAGE 19 4944675 Pages: 19 of 285 02/15/2024 12:24 PM R Fee:00.00 Carly Kopp., Clark and R.00rdar, Wald County , CO IIIII MaillI CACI' PLI AINAPIHMYki 11111 2024-0065 ORD2023-16 of thirty (30) days to provide the applicant the opportunity to pick up the removed sign for keeping. Signs not claimed within the thirty (30) day period will be recycled. 2. If the application is not accepted by the County, the fee shall be returned to the applicant. No private installation or maintenance of roadside memorial signs is allowed. B. These memorial signs shall consist of two (2) sign panels measuring standard dimensions in accordance with the MUTCD. 1. There are four (4) alternative messages for the top sign panel. These messages correspond with the type of accident or situations that occurred during the accident. The four (4) messages are: a. "Please Drive Safely" — this is the most common message used for these signs. b. "Please Ride Safely" — this message is for accidents involving motorcycles or bicycles. c. "Please Buckle Up" — this message is for accidents involving victims who were not wearing their safety restraints. d. "Don't Drink and Drive" — this message may only be used for fatal alcohol/drug (DUI) related accidents where there has been a conviction of the driver involved in the fatal crash who was in violation of Colorado DUI laws, or a toxicology report showing the victim driver to have been in violation of Colorado's DUI laws. 2. The bottom sign panel will include the message "In Memory or and the victim's name as shown in the application. The bottom sign panel can show multiple names if there were multiple victims in the accident and each of those victims' immediate family gives permission for the names to be added in the application. C. Memorial signs shall only be installed by the County on County -maintained rights -of -way. The Department of Public Works shall install the sign as close as possible to the location given in the application. If that location conflicts with existing signs or creates an unsafe condition, the sign will be moved to where it can be installed safely. If the roadway is annexed by a local municipality after installation, the applicant will be required to receive permission from that municipality for the sign to remain; otherwise, the County will remove the sign if requested by the annexing agency and return it to the applicant. Removed signs shall be held for a period of 30 days to provide the applicant the opportunity to pick up the removed sign for keeping. Signs not claimed within the thirty (30) day period will be recycled. D. The applicant shall submit a fee, as determined by the Board of County Commissioners, to help cover the sign's material cost, installation, maintenance, and removal by the PAGE 20 4944675 Pages: 20 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppes, Clerk and Rsoordsr, Wald County , CO VAIIIKPlinIVIAI It:liNtila Rik 1 II 2024-0065 ORD2023-16 County. In a multiple -fatality crash, the fee may be split equally between those families who want their family members' names on the sign. Once removed, each separate family may receive a sign to keep if requested. Removed signs shall be held for a period of 30 days to provide the applicant the opportunity to pick up the removed sign for keeping. Signs not claimed within the thirty (30) day period will be recycled. E. This section is considered to be the County's permitting system for roadside memorial signs and is in lieu of the procedural requirements of Section 43-2-149, C.R.S. ARTICLE VIII - Transportation Planning Add Sec. 8-8-10. General. Transportation planning for Weld County is a continuing, cooperative, and comprehensive process that includes the development of planning documents, working with regional agencies, securing funding for transportation projects, and reviewing safety data. Weld County collaborates with many different regional agencies in order to plan and implement needed improvements to the transportation system. Planning of the roadway network with respect to functional classification, alignment, and intersection/access spacing is developed through transportation planning. Weld County will continue to build and maintain a safe and reliable transportation system through prudent transportation planning. Add Sec. 8-8-20. Purpose. The purpose of this Article is to identify transportation planning policies, as well as the guiding technical documents for Weld County for the basis of formulating transportation planning related policies. Amend Sec. 8-8-30. Weld County Transportation Plan and Functional Classification Map. A. The Weld County Transportation Plan, as amended ("Transportation Plan"), is intended to summarize existing transportation conditions, recommend policy, funding and roadway development for the County over a twenty -five-year planning horizon. The Transportation Plan will serve an integral part in the decision -making process for County staff and elected officials. The Transportation Plan will also be an extension of the Comprehensive Plan • focusing on basic travel characteristics unique to the County. The Transportation Plan is oL found in Appendix 8-N of this Chapter and is intended to be used in concert with Chapter 22 of this Code. It is recommended to update this plan when updating the Comprehensive Plan. o� LI B. The Functional Classification Map is a component of the Transportation Plan and is the om3 process by which County roads are grouped into classes according to the character of .� - service provided. Grouping the roads into classes identifies the required minimum width °,�■.. of future road right-of-way and locations for future road right-of-way reservation. The Transportation Plan recommends the Functional Classification Map be reviewed every -- a two to three years, and can be amended by the Board of County Commissioners, as �a� needed. A link to the Functional Classification Map is found in Appendix 8-O of this d!'; - Chapter. IAma PAGE 21 rk 4944675 Pages: 21 of 283 2024-0065 ��.�� 02/15/2024 12:24 PM R Fee:$0.00 ORD2023-16 Carly Kopp.., Clerk and Recorder, Weld County , CO VIII IYU�.r11iGY4K��N�i�111�K�k1h�4�wtir�14�W�k 1I III C. The minimum road right-of-way widths are as follows, unless shown otherwise on the Functional Classification Map found in Appendix 8-O of this Chapter: 1. Arterial: 140 feet. Arterials may include planned roundabouts or other traffic features that necessitate expanded road right-of-way width as shown in arterial studies adopted by the Board of County Commissioners by resolution. 2. Collector: 80 feet. 3. Local: 60 feet. All roads maintained by Weld County have a minimum of 60 feet of road right-of-way. 4. Minimum road right-of-way widths for "Arterials Not Constructed" shown on the Functional Classification Map are found in project identifications and/or designs approved by resolutions of the Board of County Commissioners by resolution. 5. Minimum road right-of-way widths for Weld County four -lane controlled -access highways detailed in C.R.S. Section 43-2-110 are identified in approval documents. D. Where road right-of-way has not been dedicated or otherwise acquired by the County, but the County maintains a public road, the width of the prescriptive road right-of-way, which includes the entire area necessary for maintenance by the County, shall be a minimum of 60 feet (30 feet from either side of the center of the road). E. Weld County identifies primary and secondary roadway classifications, as required by C.R.S. §43-2-101. Each year, the Weld County Department of Public Works submits a map to CDOT showing the Weld County Primary and Secondary Road System and the total miles of public roads maintained by Weld County and eligible for participation in the HUTF, pursuant to the requirements of C.R.S. §43-2-110(1). Delete Sec. 8-8-40. Reserved. ARTICLE IX - Municipal Separate Storm Sewer System Amend Sec. 8-9-50. Definitions. For the purpose of this Article, the following terms, phrases, words and their derivations shall have the meanings given herein: Construction dewatering permit means the Colorado Discharge Permitting System (CDPS) General Permit COG080000, Construction Dewatering Discharges, which is regulated by the Colorado Department of Public Health and Environment, Water Quality Control Division. Add Development area means the area of land disturbance, including past and future phasing. When multiple lots are involved, such as a subdivision of land, the potential cumulative land disturbance will be considered the development area for the purposes of drainage design. PAGE 22 4944675 Pages: 22 of 285 02/15/2024 ar y5Kopp. ,1Cle k nlnd Recorrder,,OWeld County , CO rePi l'ilM ft‘Ilig IVPICIriAlkNP Ioif iri k III III 2024-0065 ORD2023-16 Stormwatermeans any surface flow, runoff and drainage occurring during or following any form of natural precipitation event and resulting therefrom and consisting entirely of water from natural precipitation events including snowmelt. Remainder of section — No change. Amend Sec. 8-9-80. Pre -construction. A. — No change. B. Pre -construction requirements. The following documents are required to be submitted and accepted by the Department of Public Works prior to any land -disturbing activity that will disturb greater than or equal to one acre of land. Applicable land -disturbing activity includes the total disturbed area, either planned or potential, from a common plan of development or sale. The Department of Public Works shall determine applicable sites and required documentation necessary to comply with MS4 Permit requirements. 1. thru 4.b. — No change. c. Drainage report; identifying the following components: site drainage; design details for permanent control measures; narratives for non- structural control measures, if applicable; and corresponding calculations used in determining compliance with the "Base Design Standards" of the MS4 permit. "Base Design Standards" are detailed in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec. 6.2.6.2 — Permanent Water Quality Control Measure Design). d. thru f. — No change. C. Enforcement. Failure to comply with this Section is a violation of this Article and enforcement procedures shall be pursued as detailed in Section 8-9-130. Additionally, a `hold' may be placed on the applicable parcel(s), which prevents future permitting of the site until requirements are met. Amend Sec. 8-9-90. Construction activity. A. thru B.2.b. — No change. Delete c. Indicator inspection: c. Inactive site inspection: An inactive site inspection is conducted at least every ninety (90) days. Inactive site inspections are reserved for sites pending final stabilization, and all construction activity has been completed. PAGE 23 4944675 Pages: 23 of 285 02/15/2024 12:24 PM R Fea:$0.00 Carly Koppel, Clark and Recorder, Wald County , CO 2024-0065 ORD2023-16 rdI'Wikdi AVIA IM 11444 II III Detailed inspection procedures can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec. 6.2.5.1 — Stormwater Inspections). C. — No change. D. Enforcement. Failure to comply with this Section is a violation of this Article and enforcement procedures shall be pursued as detailed in Section 8-9-130. Additionally, a `hold' may be placed on the applicable parcel(s), which prevents future permitting of the site until requirements are met. Amend Sec. 8-9-100. Post -construction. A. Purpose. The purpose of this Section is to require the implementation and maintenance of permanent control measures to ensure post -construction requirements of the MS4 permit are met. All control measures shall be selected, installed, implemented and maintained in accordance with good engineering, hydrologic and pollution control practices. This Section applies to all land -disturbing activities commencing after July 1, 2019. B. Post -construction requirements. The following requirements are applicable to sites for which construction activity will create a disturbed area greater than or equal to one acre and sites which will have a cumulative disturbed area greater than or equal to one acre during future phasing. The requirements are applicable to individual sites as well as sites that are part of a larger common plan of development or sale. For subdivisions, the potential development area will be considered unless otherwise platted. The Department of Public Works shall determine applicable sites and required procedures and documentation necessary to comply with MS4 permit requirements. 1. Permanent control measures. a. — No change. b. "Base design standards" can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec. 6.2.6.2 - Permanent Water Quality Control Measure Design). c. — No change. 2. As -built submittal. a. After construction of drainage is complete, a certified as -built drawing, signed and stamped by a Professional Surveyor and licensed Professional Engineer in the State of Colorado, shall be submitted to the Department of Public Works. 3. Final inspection and acceptance. PAGE 24 4944675 Pages: 24 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clark and Recorder, Weld County , CO 1111 WOW Clila AVM lkNION% lq 4 II II 2024-0065 ORD2023-16 a. After receiving the as -built, the County shall inspect the site to verify compliance with the Drainage Report, Drainage and Access Easements, Long -Term Operation and Maintenance Plan, and other submitted documentation. If the Department of Public Works determines the site has met the requirements of this Section, the site will be allowed to obtain a Certificate of Occupancy (CO). Otherwise, the parcel will remain on hold until all requirements have been met. 4. Post -acceptance oversight. a. Inspections of permanent control measures. Inspections shall be conducted at least every five (5) years, or an alternative frequency determined by the Department of Public Works, to ensure adequate long- term operation and maintenance of permanent control measures. The County Inspector shall verify the permanent control measure with the as -built and long-term operation and maintenance plan. If the inspector is unable to visually verify adequate functioning and maintenance of the permanent control measure, additional requirements may apply. Additional requirements may be avoided by installing structural components, such as a concrete trickle channel, which allows visual verification of adequate functioning and maintenance. 4.b. thru 5. — No change. C. Exemptions. 1. — No change. 2. A list of allowable exemptions under the MS4 permit can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec. 6.2.6.1 — Exemptions). The most common exemptions are as follows: a. Large -Lot Single -Family Sites: A single-family residential lot, or agricultural zoned lands, greater than or equal to 2.5 acres in size per dwelling and having a total lot impervious area of less than 10 percent. A total lot imperviousness greater than 10 percent may be allowed when a study specific to the watershed demonstrates the expected soil and vegetation conditions are suitable for infiltration/filtration of the WQCV for the site. The maximum total lot impervious covered under this exclusion shall be 20 percent. b. Undeveloped Land: Sites with land disturbance to undeveloped land (land with no human -made structures such as buildings or pavement) that will remain undeveloped. c. Above Ground and Underground Utilities: Activities for installation or maintenance of underground utilities or infrastructure that does not permanently alter the terrain, ground cover, or drainage patterns from those PAGE 25 4944675 2/1 56/2024 12,24 Pogo:: R Fee $O 00 Carly Koppel, Clerk and Recorder, Weld County , CO 2024-0065 ORD2023-16 present prior to the construction activity. This exclusion includes, but is not limited to, activities to install, replace, or maintain utilities under roadways or other paved areas that return the surface to the same condition. D. Enforcement. 1. Failure to comply with this Section is a violation of this Article and enforcement procedures shall be pursued as detailed in Section 8-9-130. Additionally, noncompliance may result in an `MS4 hold' and may be placed on the applicable parcel(s), which prevents future permitting of the site until the parcel(s) requirements are met. Amend Sec. 8-9-130. Enforcement procedures. A. — No change. B. Informal notice of violation. Except where a threatened discharge exists and/or emergency suspension is necessary, the Department of Public Works shall attempt to provide an initial informal notice to a person violating this Article. Such notice shall specify the location, type and severity of the violation and request that such person take immediate action to address the violation. Notices of violation are followed by compliance inspections to ensure the violation has been resolved. Failure to correct the violation within the specified time may result in a formal notice of violation. In the event reasonable efforts to communicate the informal notice to such person are unsuccessful, a formal notice of the violation shall be issued by the Department of Public Works. Causes for informal notices of violation include, but are not limited to: 1. Minor issues of improper handling, storage or disposal of potential stormwater pollutants; 2. and 3. — No change. C. Formal notice of violation. If the violation for which informal notice was given has not been resolved within fourteen (14) days of such notice, and no plan for corrective action has 2 been communicated, and except where emergency suspension is necessary, the Department of Public Works shall provide a formal notice of violation to persons violating this Article. Formal notices of violation are also issued for recurring violations and/or 2= violations more severe in nature. Notices of violations are followed by compliance inspections to ensure the violation has been resolved. Recurring violations may result in � m3 fees being assessed in accordance with Section 8-9-140 and/or enforcement methods being pursued in accordance with Section 8-9-150. o. - ,o,� Causes for formal notices of violation include, but are not limited to: e� -a 1. thru 9. — No change. �� L3 oL� Such notice shall describe the nature of the violation and may require without limitation: .. z � s N � � No PAGE 26 2024-0065 4944675 Pages: 26 of 285 ORD2023-16 02/1.00 Caly�K/2024 12:24 opp e,C1� k and O d R ordar,,Wad County , CO IIIII KOH irlICI MOBGII4 MVO P:ANA, ii t 1I II 1. thru 4. — No change. If abatement of a violation and/or restoration of affected property are required, the notice shall set forth a reasonable deadline within which such remediation and/or restoration must be completed. The written notice of violation shall be served by email or hand delivery or by certified mail, return receipt requested. Remainder of section — No change. ARTICLE XI - Storm Drainage Criteria Division 1- General Provisions Amend Sec. 8-11-10. Intent. A. The intent of the chapter is to provide minimum standards to preserve and protect the public health, safety and general welfare in the unincorporated lands of the County, pursuant to authority granted by Part 4 of Article 15 of Title 30, and Article 35 of Title 30, C.R.S. Remainder of section — No change. Amend Sec. 8-11-20. Definitions. For the purpose of this article, the following terms, phrases, and words and their derivations shall have the meanings given herein: Retention pond/Stormwater Infiltration facility: A flood control feature designed to temporarily store stormwater runoff and reduce peak flows. Retention ponds return water to the watershed through infiltration into the ground. Remainder of section — No change. Amend Sec. 8-11-30. Adoption of storm drainage standards. A. The Mile High Flood District's "Urban Storm Drainage Criteria Manual," (MHFD Manual) consisting of Volume 1, Volume 2, and Volume 3, as currently published or hereafter amended, is hereby adopted by reference, with the amendments and additions which are set forth herein. All references to "District" or "The District" within the MHFD Manual shall be replaced with "Weld County". All facilities for stormwater management on properties located within the unincorporated lands of the County, whether public or private, shall be designed and constructed in accordance with such criteria, unless a master drainage plan specific to the area of the site has been approved by the County. B. The criteria and procedures contained in this article are intended to supplement the MHFD Manual in ways specific to Weld County. In the case of a conflict between the MHFD Manual and the supplemental criteria and procedures in this article, such supplemental criteria and procedures shall take precedence over the MHFD Manual. PAGE 27 45144875 Page*: 27 of 285 02/15/2024 12:24 PM R Fs.:$0.00 Carly Koppel, Clark and Recorder, Weld County CO Vdrfi oeli 01,4MA 4101161., dWrih "Ill 2024-0065 ORD2023-16 C. Further guidance for stormwater design and construction shall be in accordance with Chapter 5 of the Weld County Engineering and Construction Criteria. Amend Sec. 8-11-40. Drainage policy. A. — No change. B. For new development, un-detained discharges to roadside ditches located in the County road right-of-way are prohibited. C. and D. — No change. E. Weld County shall review and approve new development in accordance with the storm drainage criteria of this article. F. — No change. G. Irrigation ditches shall not be used as outfall points for stormwater runoff from Uses by Special Review, Site Plan Reviews, Subdivisions, Planned Unit Developments, or WOGLAs unless such use is approved, in writing, by the ditch owner(s). Water quality treatment may be required. H. An as -built survey of stormwater facilities shall be provided if requested by Weld County. Add Sec. 8-11-45. Exceptions. A. Exception criteria. Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property. No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. Weld County will confirm if the development qualifies for an exception based upon the information provided by the applicant. Exception requests shall be supported with an approved drainage narrative, which must describe the following minimum criteria: 1. The exception being requested for consideration. 2. Any existing and proposed improvements to the property. 3. thru 8. — No change. B. Exceptions. Uses that can be excepted from stormwater detention are limited to the following: 1. thru 5. — No change. 6. Gravel pits if the stormwater drains into the gravel pit. Releases from the site shall comply with the Weld County Engineering and Construction Criteria, including dewatering. Topographical information shall be provided. PAGE 28 4944675 Pages: 28 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO Ell lPAIKieMifI hLlirliNtiWKriAnt'if i Wth 11 II 2024-0065 ORD2023-16 7 Residential developments with no historic flooding where all the following conditions exist. This exception shall be supported by calculations provided by the Applicant. Additional information may be requested and will be signed and stamped by a Colorado Licensed Professional Engineer: a. Nine (9) lots or fewer. b. The minimum lot size is equal to, or greater than, three (3) acres per lot. Delete c. Downstream roadway criteria are not exceeded. c. The total post -development imperviousness for the rural residential development does not exceed ten percent (10%), assuming that all internal roads and driveways are paved. 8. Development of sites where the change of use does not increase the imperviousness of the site. Note: This exception cannot be applied to sites where impervious surfaces were added for, or in conjunction with, a business that is/was operating in violation and/or without the required Weld County land use permit. 9. A parcel of land or project site where the "total developed stormwater runoff' from the 100 -year, 1 -hour storm is less than, or equal to, five (5) cfs. The "total developed stormwater runoff' includes cumulative runoff from the proposed project site plus runoff from any previously developed project site on the subject parcel. A project site is the area of land that lies within the project's limits of disturbance during construction. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer. 10. In -fill development parcels with total area less than, or equal to, one (1.0) gross acre. 11. An individual parcel with an unobstructed flow path and no other parcel(s) between the channel within a Federal Emergency Management Administration (FEMA) regulatory floodplain and the project. 12. A parcel greater than one (1) gross acre and less than, or equal to, five (5) gross acres in size is allowed a onetime exception for a new four thousand (4,000) sq. ft. of 100% impervious area or equivalent imperviousness. (See Appendix 8-Q in the Weld County Engineering and Construction Criteria Manual for impervious value percentages). 13. A parcel greater than five (5) gross acres in size is allowed a onetime exception for a new nine thousand (9,000) sq. ft. of 100% impervious area or equivalent imperviousness. (See Appendix 8-Q in the Weld County Engineering and Construction Criteria Manual for impervious value percentages). 14. No change. PAGE 29 4944675 Pages: 29 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Raoordar, Wald County , CO •IIIKINK VWrlithEILI ifItellIVN4S IA BIM 2024-0065 ORD2023-16 Amend Sec. 8-11-50. Rainfall. The designer shall use the most appropriate and best available data for the project area in determining the rainfall quantities. The applicant shall utilize local rainfall data from the National Oceanic and Atmospheric Administration (NOAA) unless otherwise approved by Weld County. The use of synthetic rainfall distribution data is not permitted. Amend Sec. 8-11-60. Runoff. A. The Rational Method should not be used to determine runoff for basins larger than one hundred sixty (160) acres. In areas located in the southwest portion of Weld County, where areas are larger than one hundred sixty (160) acres SWMM is required. Delete B. Amend Sec. 8-11-70. Street drainage for use by special review, commercial, industrial, planned unit development and residential subdivisions. A. — No change. B. Inlets. 1. The design guidelines provided in the streets/inlets/storm sewers chapter of the MHFD Manual (Volume 1) should be used when designing stormwater inlets. The standard inlets permitted for use in Weld County streets/roads are shown in the following table: Remainder of 1. and 2. (including both tables) — No change. C. Pipes. 1. The design guidelines provided in the streets/inlets/storm sewers chapter of the MHFD Manual (Volume 1) should be used when designing stormwater pipes. Remainder of section — No change. • Amend Sec. 8-11-80. Major drainage. 2 A. — No change. B. Open Channel Design Principles. ite j N 1. Grass -lined open channels conveying less than fifty (50) cfs may reduce the SmC minimum 1.0 -foot freeboard requirement to the freeboard required to convey 1.33 Nm3 times the 100 -year design flow. The reduced freeboard may only occur if a 1.0- otirr foot minimum freeboard is not physically possible, and calculations are submitted M `gz and accepted by Weld County. 0o: 4 PAGE 30 4944675 Pages: 30 of 285 02/15/2024 12:24 PM R Fe.:$0.00 Carly Koppat, Clerk and Recorder, Wald County , CO ■��KirdrilliN MIVICIERTILiAlkifIVOLi ■l11 2024-0065 ORD2023-16 2. Generally, channels and swales should be no steeper than 4:1. If steeper slopes are required due to site constraints, the design engineer shall address how the channel will be maintained. Amend Sec. 8-11-90. Culverts in County road right-of-way. A. Sizing. 1. The applicant shall contact Weld County to determine which types of storm sewer pipes are permissible for use in County road rights -of -way or public drainage easements. 2. — No change. B. Materials. Culverts that are to be installed in a County road right-of-way that is routinely burned must be made of either concrete or metal. Pipes made of flammable materials (such as PVC or HDPE) will not be allowed in County road rights -of -way that are subject to weed burning. Amend Sec. 8-11-100. Storage. A. Detention Criteria. 1. and 2. — No change. 3. Off -site flows can be routed over the spillway or routed around the site. Delete a. Delete b. 4. The elevation of the top of the detention pond embankment, except at the spillway, must be a minimum of 1 -foot of freeboard above the 100 -year water surface elevation in the detention pond. 5. Outlet structures should be sized and structurally designed to release at no more than the 1 -hour, 5 -year historic release rate in urbanizing drainage areas and 1 -hour, 10 -year historic release rate in non -urbanizing drainage areas without structural or hydraulic failure. Historic is defined as an undeveloped site with a 2.0% imperviousness. The outlet pipe must contain a minimum of two concrete cutoff walls embedded a minimum of eighteen (18) inches into undisturbed earthen soil. The cutoff walls must be a minimum of eight (8) inches thick. The outlet pipe bedding material must consist of native earthen soil, not granular bedding material, to at least the first downstream manhole or daylight point. 6. — No change. PAGE 31 02/45/2024 12,24 Pages: R Fey $0 05 Carly Kopecs, Clerk and Recorder, Weld County , CO Mt! h� P .�'�'lC�ii4k� ��l��Yl II III 2024-0065 ORD2023-16 7 A concrete cutoff wall eight (8) inches thick, three (3) feet deep, and extending a minimum of five (5) feet into the embankment on each side of the emergency spillway opening, is required on all privately -maintained detention ponds and regional detention ponds. The concrete cutoff wall permanently defines the emergency spillway opening. The emergency spillway elevation must be tied back into the top of the embankment using a maximum slope of 4:1. 8. and 9. — No change. B. Retention Criteria. 1. thru 3. — No change. 4. The design of the retention facility must provide evidence that the pond will drain in accordance with C.R.S. 37-92-602(8), as amended, when only draining through the bottom of the pond (side slopes cannot be used in the calculation). A retention pond that can cause injury to water rights or is in violation of state or federal law will not be accepted. C. Erosion Protection Design Criteria. Erosion protection for storage facilities must be designed to prevent erosion and ensure that the sediment does not leave the site or impact downstream properties. It will be necessary to leave erosion control measures in place until one season of growth and the site reaches final stabilization (70% vegetative cover). The Control Measures/BMPs outlined in the MHFD Manual (Volume 3) should be used. Amend Sec. 8-11-110. Revegetation. A. Weld County utilizes the information provided in the Revegetation Chapter of the MHFD Manual (Volume 2), and the Best Management Practices Chapter of the MHFD Manual (Volume 3). Weld County has recommended seed mixes that are applicable to specific areas of the County. These seed mixes can be found in the Weed Management Section of the Weld County Public Works Website. Noxious weeds shall be controlled on site, pursuant to Chapter 15, Articles I and II, of the Weld County Code. B. Seeding and Planting. In addition to the site preparation guidelines outlined in the revegetation chapter of the MHFD Manual (Volume 2), if mulching with straw, the straw must be free of seeds and weeds. Amend Sec. 8-11-120. Stormwater quality. A. A water quality feature improves the quality of stormwater runoff resulting from the impacts of site development. A water quality feature can be an existing low spot on a property that naturally collects water, or it can be an area on a property that has been excavated to capture stormwater runoff. The required water quality capture volume of a feature is based on the site's size and imperviousness. A properly sized feature will capture and hold stormwater runoff for the period of time necessary for contaminants to settle out before stormwater runoff is allowed to exit the site. PAGE 32 4944675 Pages: 32 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppss, Clark and Recorder, Wald County , CO B111 2024-0065 ORD2023-16 B. An accepted methodology for a water quality feature design can be found in the MHFD Manual, Volume 3, Best Management Practices. Remainder of section — No change. Amend Sec. 8-11-130. Control measures. Weld County uses the Control Measures/BMPs that are outlined in the MHFD Manual (Volume 3) Best Management Practices. Amend Sec. 8-11-140. Maintenance. A. Culverts located outside of County -maintained road rights -of -way are not maintained by Weld County. The owners of those culverts are responsible for their maintenance. Culverts that are part of a subdivision drainage plan are maintained by the respective homeowner's association. Those culverts should be maintained and cleaned out annually, per the drainage report maintenance plan, or on an as -needed basis to ensure proper drainage of the subdivision. B. thru D. — No change. E. Areas designated for stormwater storage, retention, or detention are not to be used for storage of materials, building, or parking, or modified without approval from Weld County. Amend Sec. 8-11-160. Stormwater drainage criteria variances. The variance procedure is intended to address cases of hardship. Relief from the provisions of this article may not be granted when the hardship is brought about solely through the actions of the appellant. No relief may be granted when the result of granting the requested relief is detrimental to the public health, safety, and general welfare or when the relief is contrary to the purpose and intent of this article. In granting any variance, Weld County may prescribe appropriate conditions and safeguards in conformity with this article. Violation of such conditions and safeguards, when made a part of the terms under which the variance is granted, shall be deemed a violation of this article. The variance request shall be stamped and signed by a professional civil engineer 8i licensed to practice in the State of Colorado. Requests will be reviewed by the proper Weld County designee. In order to be granted, the variance request must meet the criteria as specified in Chapter 12 of the Weld County Engineering and Construction Criteria (Appendix 8-Q of the Weld U County Code). 13:1-4 Nm Delete A. thru E. °' ' Remainder of section - No change. a 74 O dni4 �MnN � �N o � : PAGE 33 .7a1. 4944675 Psges: 33 of 285 2024-0065 02/16/2024 12:24 PM R Fee:$0.00 ORD2023-16 Carly Koppel, Clark and Recorder, Weld County , CO �� INFJI FIA4C IVIATTIL MCIONi ri+MLtiY4 II 111 ARTICLE XII - Grading Permit Policy Amend Sec. 8-12-10. General. The Grading Permit is a tool to ensure that the County has reviewed proposed grading plans and erosion and sediment control practices for planned construction activities with the goal of avoiding potential damages and risks to the public. A Grading Permit grants the Permit Holder permission to conduct construction activities within the requirements of applicable state regulations and provides the County with sufficient oversight to minimize the potential for offsite damages. In addition, construction activities in the County must be compliant with applicable state regulations regarding releases of sediment and water from construction sites. This policy shall apply within all unincorporated areas of the County as of the effective date of this Article. Amend Sec. 8-12-20. Purpose. This Article recognizes the importance of protecting the health, safety and welfare of the public, safeguarding County infrastructure, and the protection of water quality and private property rights. This Article describes the minimum requirements for prevention of detrimental or negative impacts to County water quality and damages to private property and County infrastructure by construction activities within the County. The goals are: A. thru C. — No change. Add D. To identify and eliminate any preventable damages to County infrastructure caused by construction activities. Add E. To ensure compliance with all Federal, State, and County laws and regulations pertaining to grading and water quality. Amend Sec. 8-12-30. Grading Permit. A. Issuance of Grading Permit. A Grading Permit shall be issued only in compliance with the rules and regulations set forth in this Article. In no event shall construction be allowed or permitted if it is detrimental to the public health, welfare and safety or the grading and/or sediment and erosion control plans indicate that the construction activities will be out of compliance with Federal or State laws and regulations. B. - No change. C. No Work Without Permit. No person or entity may surface disturb, grade, construct or excavate over one (1) acre of nonexempted ground without first having obtained a Grading Permit from Weld County. In addition, no person or entity may grade, excavate, construct or leave disturbed and unstabilized over one (1) acre of nonexempted ground beyond the date or dates specified in the Permit unless: (1) the person or entity requests a written extension before the expiration of the initial Permit; and (2) a new Permit or extension is granted. It is a violation of this article to perform this work without a permit. PAGE 34 4944675 Pages: 34 of 285 02/15/2024 12:24 PM R Faa:$0.00 Carly Kopp's, Clerk and Recorder, Wald County , CO VIII 11 2024-0065 ORD2023-16 D. Exemptions. The following land disturbance activities are permissible without obtaining a Grading Permit, unless otherwise located within a designated Municipal Separate Storm Sewer Systems (MS4) area. The Department shall determine if the exemption is in accordance with the County's MS4 permit. Other permits, such as right-of-way, flood hazard or OVVTS, may still be required. 1. thru 4. — No change. 5. County capital improvement or County maintenance projects within a road right- of-way and temporary construction easements (TCE). 6. — No change. 7. Maintenance and resurfacing of existing streets/roads, parking/outdoor storage areas, runways, and sidewalks/trail systems. 8. Performance of emergency work necessary to prevent or mitigate an immediate threat to life or property when an urgent necessity arises. The person performing such emergency work shall promptly notify Weld County of the problem and work required. Any person performing such emergency work shall immediately notify Weld County of the situation and the actions taken. The Weld County Public Works and/or Planning Services Director may, however, require such person to obtain a Grading Permit to implement remedial measures to minimize erosion resulting from the emergency. 9. and 10. — No change. 11. Land disturbance associated with the construction of natural surface trails may be exempted by Weld County except within designated MS4 areas, provided that the procedure outlined in this Article is completed prior to commencement of any trail construction. If exempted, the land disturbance associated with the construction of natural surface trails shall generally conform with the performance standards of this Article. Amend Sec. 8-12-40. Definitions. For the purpose of this Article, the following terms, phrases, words and their derivations shall have the meanings given herein: Add Construction dewatering permit: means the Colorado Discharge Permitting System (CDPS) General Permit COG080000, Construction Dewatering Discharges, which is regulated by the Colorado Department of Public Health and Environment, Water Quality Control Division. Add Construction stormwater permit: means the Colorado Discharge Permitting System (CDPS) General Permit COR400000, Stormwater Discharges Associated with Construction Activity, which is regulated by the Colorado Department of Public Health and Environment, Water Quality Control Division. PAGE 35 4944675 Pages: 35 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Weld County , CO IIIII INFIII iK #I AIFINII 4RNICIMI R Oilliti1i ilk 11111 2024-0065 ORD2023-16 Right-of-way (ROW): means a strip of land that is dedicated or granted to, and accepted by, Weld County for transportation purposes, such as a roadway or highway, whether maintained or non -maintained by Weld County. The term is used as both singular and plural. Add Stormwater construction permit: is the state -issued permit for construction activity disturbing one (1) acre or more, including disturbance less than one (1) acre but is part of a larger common plan of development or sale. Amend Sec. 8-12-50. Grading Permit application. A. Complete Application Required. Applicants shall file a complete application for a Grading Permit. Based upon the information provided in the application, additional submittals may be required by Weld County if sufficient information was not provided for review of the application. An application shall be considered complete if it is submitted in the required form, includes all mandatory information, including all supporting materials specified by application, and is accompanied by the applicable fee. If an application is determined to be incomplete, Weld County shall provide notice to the applicant, along with an explanation of the application's deficiencies. No further processing of the application shall occur until the deficiencies are corrected in a future resubmittal. An application which is determined to be incomplete may, or may not, retain its same processing cycle. B. A complete application will typically include civil engineering drawings signed and sealed by a registered Civil Engineer in the State. The drawings shall include a grading plan (with existing and proposed contours, spot elevations, and earth balance when requested), and a drainage plan. In addition, a Sediment and Erosion Control Plan that shows the location and types of control measures to be utilized at the site shall be provided. Typical control measure installation details and maintenance notes should also be on the drawings. C. — No change. Amend Sec. 8-12-60. Application review, Grading Permit issuance, permit expiration and permit extension. A. Review Process. The application and other data filed by an applicant for a Grading Permit shall be reviewed by Weld County. The application may also be reviewed by other departments or agencies to verify compliance with any applicable laws. If Weld County finds that the work described in an application for a Grading Permit conforms to the requirements and regulations set forth in this Article and meets the requirements defined in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q) or other pertinent laws regulations or ordinances, and that all required fees have been paid, a Grading Permit shall be issued to the applicant. Criteria upon which the Grading Permit shall be considered include, but are not limited to, the following: 1. thru 3. — No change. B. Changes in a Weld County Grading Permit. AWeld County Grading Permit shall not be changed, modified or altered without written authorization from the County. All work shall be done in conformance with the Permit issued. PAGE 36 4944675 Pages: 36 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppel, Clark and Recorder, Weld County , CO 2024-0065 ORD2023-16 Allit1114O411M4, II C. Permit Limitations. A Weld County Grading Permit requires the Permit Holder to meet certain permit specifications and general engineering standards. Weld County shall be responsible for ensuring compliance with such specifications and standards. The issuing and granting of the Grading Permit shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of this Article or of any Federal, State or County regulations. Additionally, the issuance of the Grading Permit shall not be construed as the approval or issuance of any necessary permits referred to in this Code. D. Indemnification. Every Weld County Grading Permit issued shall include the following language: "Permit Holder, its agents, employees, subcontractors, contractors and assigns hereby agree to hold Weld County, Colorado, the agencies thereof and their officers and employees harmless from any and all loss and damage or any claims which may arise out of, or be connected with, the construction within the area covered by this permit; excluding any such loss and damage or any claims (including consequential damages) which may be caused solely by the negligence of Weld County, the agencies thereof or its officers and employees." E. — No change. F. Permit Expiration. Every Weld County Grading Permit shall expire one (1) year from the issuance of the permit. If the permit has expired, the Grading Permit must be reissued by the County before work can begin or be resumed. Prior to the expiration or closure of the Grading Permit, the disturbance shall be stabilized, and non -permanent control measures shall be removed. G. Permit Extension. Any Permit Holder with an unexpired Grading Permit may apply, in writing, for an extension of the time within which work may begin under that Grading Permit if the Permit Holder is unable to begin or complete work within the time required for good cause, and that the cause is acceptable to Weld County. There may be an extension fee assessed to cover administrative costs. Amend Sec. 8-12-80. Permit Holder's general responsibilities. A Permit Holder is responsible for the following items. Additional requirements and more detailed information are shown in the Special Provisions of the Grading Permit. A. Control Measures. The Permit Holder shall ensure that all erosion and sediment control measures shown on the accepted plans are correctly installed and maintained. B. Other Permits. The Permit Holder shall secure all permits required by federal, state and local agencies. Permit Holder may need to provide additional documentation in order for the County to make a determination if a grading permit is required. C. — No change. D. Surety. If deemed necessary by Weld County, the Permit Holder shall provide a surety bond and/or other security for the total amount required to stabilize, restore or reclaim the PAGE 37 0244575 2eo: 37 of 285 4156/2024 12:24 9PM R F..:$0.00 Carly Koppel, Clark and Recorder, Wald County , CO VIII WWII sill iCR tivarilk.l hlAillUilut 11111 2024-0065 ORD2023-16 disturbed ground to prevent erosion and/or release of sediment, excessive storm water and/or pumped water discharges to surface waters from the construction area. Said security shall remain in effect for a period of twenty-four (24) months after all completion of construction and establishment of erosional stability. The amount of the security shall be sufficient to stabilize a disturbed site to prevent releases of sediment and water from construction sites and protect the health, safety and welfare of the public. The amount shall be based on cost estimates of site restoration provided by the applicant and accepted by the County. Whether or not covered by surety, the Permit Holder shall reimburse the County for any and all expenses incurred by the County within twenty-four (24) months after completion of any work as a result of, or related to, failure by the Permit Holder to perform all installation, construction, maintenance or other work pursuant to the Grading Permit, in a workmanlike manner. E. — No change. F. Traffic Control. Construction activities impacting the County rights -of -way shall not interfere with movement of traffic or compromise public safety. A County Right -of -Way Use Permit may be required in addition to a Grading Permit. G. Emergency Conditions. When a condition arises where emergency work must be performed, the applicant shall immediately notify the County of the emergency event, type and extent of work. Within two (2) business days after the occurrence of the emergency, the applicant shall apply for the necessary permits, pay the associated fees and fulfill the rest of the requirements necessary to comply with the Grading Permit for the actions the applicant took in response to the emergency. H. — No change. Site Stabilization, Restoration and Cleanup. The Permit Holder shall assume all responsibility for stabilizing the permitted site to prevent erosion and discharges of sediment. The Permit Holder shall also assume all responsibility for removing all debris associated with the construction activities in the County rights -of -way and all non- permanent control measures. If, upon inspection, the County determines that there is risk of erosional damage, or sediment discharges or debris has not been removed from the County rights -of -way, the County shall notify the Permit Holder of the violation of the Grading Permit conditions. The Permit Holder, upon notification from the County, shall correct all work to the extent necessary. The work shall be completed within the time period specified in the notice from the County. If the Permit Holder fails to establish site stability or restore the rights -of -way in the manner and to the condition required, the County may perform the restorations. In that event, the Permit Holder shall pay to the County, within thirty (30) days of billing, the cost of restoring the County rights -of -way. Remainder of section — No change. Amend Sec. 8-12-90. Inspections. A. Inspections during the construction period may be made by the County to ensure that work is progressing in compliance with the Grading Permit. It shall be the responsibility of the PAGE 38 4944675 Pages: 38 of 285 0Carly5Kopper ,4 1 Clerk anld Recorder,,OWld County , CO VIII IYUFAAIII.iflinlihi MI L V6 & AI II 2024-0065 ORD2023-16 Permit Holder to provide safe, access to the work site for the County and to all others, as authorized by law, for inspection at all reasonable times during the execution and upon completion of the work. At the time of inspection, the County may order the immediate termination of any work which involves the unauthorized exportation of material, or which poses, or is causing, a serious threat to the life, health, safety or well-being of the public. B. It shall be the responsibility of the Permit Holder to notify the County when work is ready for inspection. Weld County requires that every request for inspection be received at least forty-eight (48) hours before such inspection. Such requests may be made by telephoning or emailing the Department of Planning Services. The presence of County employees on - site shall not guarantee or qualify the Permit Holder's performance. The Weld County Grading Permit must be available on -site for review by County staff. Failure to comply may result in suspension of the Grading Permit. C. To ensure compliance with this Article, the County may make, or require, inspections and/or testing of any work as deemed necessary. Work performed without required inspections shall be subject to removal and replacement at the Permit Holder's expense, regardless of the quality of the work. Any inspection required outside of the normal working hours will be paid for by the Permit Holder. Certain types of work may require continuous inspection. When such projects exceed the County's ability to provide ample inspection, the Permit Holder will incur the cost for providing a private inspection firm to conduct inspections as needed. This third -party inspector will be appointed by the County prior to issuance of the Grading Permit. Amend Sec. 8-12-110. Appeal of denial of Grading Permit. If an application for a Grading Permit is denied by the County, or if the applicant objects to any of the terms or conditions of a permit thereby placed by the County, the applicant has the right to appeal the decision to the Board of County Commissioners, in writing, utilizing the appeal procedures set forth in Section 2-4-10 of this Code. Amend Sec. 8-12-120. Failure to comply with terms of grading permit. A. The issuance of the Grading Permit based on plans, specifications or other data shall not ii prevent the County from requiring the correction of errors in the plans, specifications and 4 other data, or from stopping excavation or construction operations being conducted in violation of this Article or any other state or County regulations. Failure of the applicant to 8& comply with any of the terms and conditions of the Grading Permit shall be sufficient cause ae . for cancellation of the Grading Permit. A ▪ B. The Permit Holder shall prevent releases of sediment and water from construction sites ana2i% that have the potential to cause damage to private property or County -maintained ;2...4 infrastructure. In the event that construction activities result in erosion or sediment and water discharges causing damage, the Permit Holder shall immediately attempt to prevent .13R further harm, by installing or replacing appropriate control measures and by correcting any 'r'.� unsatisfactory work. aaYm C. Right -of -Way Damage. The Permit Holder shall correct any unsatisfactory work. Actions .1U -� ▪ i .. PAGE 39 e 4944673 P�aos: 39 of 283 2024-0065 w.�= 02/15/2024 12:24 PM R Fae:$0.00 ORD2023-16 �a�� Carly Kopp.., Clark and Recorder, Wald County CO VIII railii gliNdMI Mr+NDiMk Iii Bill to remedy unsatisfactory work may include the patching and/or the removal and replacement of defective pavement. Other actions may be required. If the Permit Holder fails to restore the County rights -of -way in the manner and to the condition required by the Department of Public Works, or fails to satisfactorily and timely complete all restorations required by the Department of Public Works to a same or better condition, or in a timely manner, the County shall have the right to perform the restorations at the expense of the Permit Holder. Amend Sec. 8-12-130. Permit suspension or revocation. A. The County may deny, revoke or suspend any Grading Permit in order to protect the public health, safety and welfare. Permit Holders hold Grading Permits as a privilege. The County reserves the right to revoke any Grading Permit without a fee refund when the Permit is issued in error, based on incorrect information provided by the applicant, or when the Permit is issued in violation of any provisions of this Article. B. The grading permit will be suspended should the County determine that the Permit Holder has committed a substantial breach of the terms or conditions of any statute, ordinance, rule, or regulation, or any condition of the Grading Permit itself. Weld County will notify the Permit Holder of the Grading Permit suspension by either phone, or in writing, and mandate that the Permit Holder remedy the violation. The demand shall state that continued violations may be cause for revocation of the Grading Permit. Further, a substantial breach shall allow the County to place additional or revised conditions on the Grading Permit. C. Within twenty-four (24) hours of receiving notification of the suspension, the Permit Holder shall contact the County with a plan of correction which must be accepted. The Permit Holder's failure to contact the County, to submit an acceptable plan, or to reasonably implement the accepted plan shall be cause for immediate revocation of the Grading Permit and termination of work. Upon revocation of the Grading Permit, the Permit Holder will be required to re -apply for a new permit and will be charged for any additional fees that may be applicable. Amend Sec. 8-12-140. Penalties. A. Violations and Penalties. The County, through the Departments of Planning Services and Public Works or other County departments so authorized, may enforce this Article through methods included in this Article or through other methods adopted by the Board of County Commissioners. Remainder of section — No change. ARTICLE XIII - Right -of -Way Use Permit Policy Amend Sec. 8-13-10. General. The County strives to keep its road right-of-way in a state of good repair and free from unnecessary encumbrances. The Right -of -Way Use Permit is a tool to regulate and permit the PAGE 40 4944675 Pages: 40 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO 2024-0065 ORD2023-16 II use of Weld County's public road right-of-way by private companies, municipalities and/or special district constructing and burying lines either crossing or running parallel within Weld County road right-of-way. Crossings are allowed for all lines. Parallel installations are allowed for lines of "public utilities" that are defined in C.R.S. § 40-1-103 and are "domestic or foreign electric light power, gas, or pipeline companies" holding current Certificates of Public Convenience and Necessity issued by the Colorado Public Utilities Commission; for water lines of municipalities, water districts, and water and sewer districts; for transmission lines or pipelines used solely for agricultural purposes; for fresh water above -ground transfer pipelines; and for lines in non - maintained road right-of-way if approved by Weld County based upon locational factors, such as, surrounding population density, topography, or if the road right-of-way provides access to a recorded exemption lot, and with Permittee's agreement to move the line at its sole expense if Weld County or an annexing municipality intends to improve the road right-of-way; or if authorized by the Board of County Commissioners in an appeal of the denial of a Right -of -Way Use Permit application, pursuant to Section 8-13-110, below. Public road right-of-way subject to regulation by the Right -of -Way Use Permit includes Weld County's maintained and non -maintained road right-of-way, and all public drainage easements. A Right -of -Way Use Permit grants the Permittee and its Contractors permission to occupy designated County road right-of-way. The Permit authorizes excavation, surveying, and/or construction of facilities within the County road right-of- way and provides for their subsequent restoration upon completion of the Project. This Policy shall apply within all unincorporated areas of the County. Amend Sec. 8-13-20. Purpose. This Article recognizes the importance of protecting the health, safety and welfare of the traveling public, maintaining efficient traffic flow and preserving the integrity of Weld County's road right-of-way. Amend Sec. 8-13-30. Regulation of work in county road right-of-way. A. Issuance of Right -of -Way Use Permit. A Right -of -Way Use Permit shall be issued only in compliance with the rules and regulations set forth in this Article. In no event shall construction within the County road right-of-way be allowed or permitted if it is detrimental to the public health, welfare and safety. B. Right -of -Way Use Permit Necessary. A Right -of -Way Use Permit is required for occupying, constructing, maintaining or excavating facilities within, and for encroaching upon, any County road right-of-way. C. No Work Without Right -of -Way Use Permit. No person or entity may occupy, construct, perform maintenance or excavate within any County road right-of-way or easement, or encroach upon any County rights -of -way or easement, without first having obtained a Right -of -Way Use Permit from the Department of Public Works. In addition, no person or entity may excavate, construct, perform maintenance or occupy the County road right-of-way beyond the date or dates specified in the permit unless: (1) the person or entity requests a written extension before the expiration of the initial permit, and (2) a new permit or extension is granted. PAGE 41 4144873 Pages: 41 of 283 02/1'3/2024 12:24 PM R Fee:50.0Id County CO ,IIII Carly Kopp., Clerk and !Warder, 2024-0065 ORD2023-16 Amend Sec. 8-13-40. Definitions. For the purpose of this Article, the following terms, phrases, words and their derivations shall have the meanings given herein: Permittee means the owner, operator, person and/or entity constructing, excavating or occupying the County road right-of-way who has obtained a permit pursuant to this Article. Right -of -Way (ROM) means a portion of land that is dedicated or granted to and accepted by Weld County for transportation purposes, such as a roadway or highway whether maintained or non -maintained by Weld County. The term is used as both singular and plural. Remainder of definitions — No change. Amend Sec. 8-13-50. Right -of -Way Use Permit application. Complete Application Required. Applicants shall file a complete application for a Right -of -Way Use Permit. Based upon the information provided in the application, additional submittals may be required by the Department of Public Works if sufficient information was not provided for review of the application. An application shall be considered complete if it is submitted in the accepted form, includes all mandatory information, including all supporting materials specified by application. If an application is determined to be incomplete, the Department of Public Works shall provide notice to the applicant, along with an explanation of the application's deficiencies. No further processing of the application shall occur until the deficiencies are corrected in a future resubmittal. An application which is determined to be incomplete may or may not retain its same processing cycle. The Right -of -Way Use Permit is found in Appendix 8-P, the terms and conditions of which are incorporated into this Article. Amend Sec. 8-13-60. Application review, Right -of -Way Use Permit issuance, permit expiration and permit extension. A. Review Process. The application and other data filed by an applicant for a Right -of -Way Use Permit shall be reviewed by the Department of Public Works. The application may also be reviewed by other departments or agencies to verify compliance with any applicable laws. If the Department of Public Works finds that the work described in an application for a Right -of -Way Use Permit conforms to the requirements and regulations set forth in this Article, meets the requirements defined in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q) or other pertinent laws regulations or ordinances, and that all required fees have been paid, a Right -of -Way Use Permit shall be issued to the applicant. Criteria upon which the Right -of -Way Use Permit shall be considered include, but are not limited to, the following: 1. Safety: Occupation, construction, maintenance or excavating within the County road right-of-way must not create a safety hazard to the travelling public. 2. Constructability: All construction, maintenance or excavation within the County road right-of-way must be able to be performed according to general construction practices. PAGE 42 4944675 Pages: 42 of 285 02/15/2024 12:24 PM R Fe.:$0.00 Carly Kopp., Clark and Raoordar, Wald County , CO 11111 kirdNIllL +I JS'IKIIITALIi E hrhtiW1 wY4 1I II 2024-0065 ORD2023-16 B. — No change. C. Permit Limitations. An approved Right -of -Way Use Permit requires the Permittee to meet certain permit specifications and general engineering standards when working within the Weld County road right-of-way. The Department of Public Works shall be responsible for ensuring compliance with such specifications and standards. Reasonable care should be used to avoid damaging the existing roadway and/or County road right-of-way. The issuing and granting of the Right -of -Way Use Permit shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of this Article or of any regulations of the County. D. Indemnification. The Permittee, its agents, employees, subcontractors, Contractors and assigns, hereby agrees to hold Weld County, Colorado, the agencies thereof and their officers and employees harmless from any and all loss and damage or any claims which may arise out of, or be connected with, the construction, installation, maintenance, alteration, removal or presence of the lines installed and/or constructed herein referred to or any work or facility connected therewith, within the area covered by this permit; excluding any such loss and damage or any claims (including consequential damages) which may be caused solely by the negligence of the County, the agencies thereof or its officers and employees. The Permittee fully understands that all line installation, construction, maintenance and relocation will be performed at no expense whatsoever to the County. E. Permit Expiration. Every issued Right -of -Way Use Permit shall expire if the work authorized by the permit has not substantially begun within three (3) months from the date of the permit issuance or if the construction of work authorized by the permit is suspended or abandoned for a period of one (1) year at any time after the work has begun. Before work can begin or be resumed, a new permit must be applied for and reissued by the Weld County Department of Public Works. F. Permit Extension. Any Permittee with an unexpired Right -of -Way Use Permit may apply, in writing, for an extension of the time within which work may begin or be completed under _ that permit if the Permittee is unable to begin and complete work within the time required for good cause, and that the cause is acceptable to the Weld County Department of Public ME Works. If Permittee does not apply prior to the Permit expiring, the Permittee shall reapply 2 for a new Permit. Projects in progress under and expired Permit shall suspend work until a new permit is issued. There shall be an extension fee assessed to cover administrative �-r costs. av sa Amend Sec. 8-13-70. County authority. 47:42 A Right -of -Way Use Permit is considered to be a license for use of the County road right- -1=of-way. The Department of Public Works shall have the authority to suspend work, wholly or in LL41 o� part, because of the failure of the Permittee to properly execute the work in accordance with this Article. Weld County, notwithstanding the issuance of any permit or construction in Weld County :a724 sh .a eDNY`� sn PAGE 43 — --- -- - - -- - - - 2024-0065 w ; = 4944875 Pages: 43 of 285 02/16/2024 12:24 PM R F..:$0.00 ORD2023-16 Carly Koppel, Clerk and Recorder, Weld County , CO IIIII MIL iiII. DIIIRIVIIIIVI hAKNwJA II NNN road right-of-way, reserves the right to make any changes, additions, repairs or required relocation of any facilities within the dedicated road right-of-way at any time including, but not limited to, in connection with the relocation, reconstruction, widening and maintaining roads or road right-of-way, without compensating the owner. Amend Sec. 8-13-80. Permittee's general responsibilities. The Permittee is responsible to comply with all of the terms and conditions set forth in this Article and the Right -of -Way Use Permit found in Appendix 8-P. Amend Sec. 8-13-90. Inspections. A. Inspection of work performed within Weld County road right-of-way, pursuant to an approved Right -of -Way Use Permit, is required. Inspections during the construction period will be made by the Weld County Department of Public Works to ensure that work is progressing in compliance with the Permit. If at any time during an inspection it is determined work is out of compliance with the Permit or there is a safety concern, a stop work order shall be enforced until compliance has been returned. It shall be the responsibility of the Permittee to provide safe access to the work site for the Department and to all others, as authorized by law, for inspection at all reasonable times during the execution and upon completion of the work. At the time of inspection, the Department may order the immediate termination of any work which poses a serious threat to the life, health, safety or well-being of the public. B. It shall be the responsibility of the Permittee to notify the Department of Public Works when work is ready for inspection. The Department requires that every request for inspection be received at least forty-eight (48) hours before such inspection. Such requests may be made by telephoning, or emailing the Department. The presence of Department employees on -site shall not guarantee or qualify the Permittee's performance. The approved permit must be available on -site for review by Department staff. Failure to comply will result in suspension of the Permit. C. — No change. Amend Sec. 8-13-100. Administrative fee. All required fees shall be paid in full prior to Permit issuance. The fee schedule for Right - of -Way Use Permits shall be as determined by resolution of the Board of County Commissioners and shall be shown on the permit. If the applicant objects to the denial of a permit application by the Weld County Department of Public Works, or objects to any of the terms or conditions of a permit thereby placed by the Department, the applicant has the right to appeal the decision to the Board of County Commissioners, in accordance with the procedures detailed in Section 12-4-110, below. Amend Sec. 8-13-110. Appeal of denial of Right -of -Way Use Permit. %gll Remainder of section — No change. iEttr- ink 91 PAGE 44 IS 2024-0065 �N o ti 4944675 Pages : 44 of 285 02/15/2024 12:24 PM R F..:50.00 ORD2023-16 rm> Carly Kopp., Clark and Recorder, Wald County , CO m�i ■III M VI'W%'VI �Cth�h.�it�Myuk '�.' 1O14 11111 Amend Sec. 8-13-120. Failure to comply. A. — No change. B. The Permittee shall correct any unsatisfactory work including, but not limited to, defects in removal, replacement or patching. If the Permittee fails to restore the Weld County road right-of-way in the manner and to the condition required by the Weld County Department of Public Works or fails to satisfactorily and timely complete all restorations required by the Department, the County shall have the right to perform the restorations at the expense of the Permittee. C. Weld County reserves the right to require relocation of any facilities within the dedicated road right-of-way at any time without compensating the owner. If the Contractor or Permittee does not perform the required relocation within four (4) months of notification from the Weld County Department of Public Works, no new permits will be issued from the Department of Public Works for the contractor until the relocation has been accomplished. Amend Sec. 8-13-140. Enforcement. A. — No change. B. Criminal Penalties. 1. It is unlawful to occupy, construct or excavate within any Weld County road right-of-way or encroach upon any County road right-of-way, unless a Right -of - Way Use Permit is first issued. Any person, firm or corporation violating any provision of this Article is guilty of a Class 2 petty offense, which, upon conviction thereof, shall be punishable by a fine of three hundred dollars ($300.00) or by imprisonment in the County jail for not more than ten (10) days, or by both such fine and imprisonment, for each separate violation. Each day during which such violation continues shall be deemed a separate offense. Remainder of section — No change. ARTICLE XIV - Road Access Policy Amend Sec. 8-14-10. Intent of road access policy. This Article XIV is established for the safe and efficient movement of traffic while allowing reasonable and safe access to properties. It is necessary to protect the public health, safety and welfare to maintain conventional traffic flow along with unobstructed roadside drainage and to protect the functional integrity (safety, mobility, and capacity) of County roadways. Access management is an important tool in transportation planning, which identifies the safety, spacing and location of driveways, median openings, and the interconnectivity of road classifications to maintain the access and mobility function of collector and arterial roads. This Article XIV shall apply to all accesses utilizing County rights -of -way within the unincorporated area of Weld County. PAGE 45 4644875 Pages: 45 of 285 02/10/2024 12:24 PM R Fee:$0.00 Carly Kopp•s, Clerk and Recorder, Weld County , CO Ir111911.0RQN r1 rialiNIV;I Obi11111 2024-0065 ORD2023-16 Amend Sec. 8-14-20. Purpose and intent. The purpose of access management is to manage the safety of existing and proposed accesses adjacent to land uses on County roads to ensure that safety, capacity, and function are preserved and a reduction in conflict points occurs. This Article XIV describes the minimum requirements for the design, construction and maintenance of accesses onto Weld County road rights -of -way and requires the issuance of an access permit prior to construction. Amend Sec. 8-14-30. Regulation of access onto County roadways. A. Access to a Single Parcel. Each parcel shall be limited to one (1) safe access point for safe ingress and egress, which may be an existing or new shared access, except if allowed pursuant to Subsection E., below. B. Access Permit Required. An access permit shall be required for any of the following: 1. Constructing a new safe access onto a County road right-of-way, 2. Reconstructing, paving, altering, relocating, or enlarging an existing access location, 3. Changing the use or type of traffic of any existing access location, or 4. Increasing the amount of traffic using an existing access location. C. Issuance of Access Permit. Access Permits shall be issued only in compliance with the rules and regulations set forth in this Article XIV. In no event shall an access be allowed, or permitted, if it is detrimental to the public health, welfare, and safety. No such work shall commence prior to the issuance of an Access Permit. D. Emergency Access. Police, fire, ambulance and other emergency providers may have direct access to County roadways, on a case -by -case basis in the interest of public safety. If allowed, the emergency access is not intended to be used as a primary access accessible to the general public. The emergency access may be exempt from the minimum spacing criteria and shall be signed as emergency access only, gated and include a Knox box, or other types of safety improvements. In no way shall the emergency access be in a location that poses a safety risk or jeopardize the public health, safety, and welfare of public and private property. E. Additional Access. Additional accesses to a parcel may be allowed if the applicant demonstrates a need for more than one access, the proposed accesses comply with the spacing criteria for that road, and no other safety concerns exist (e.g. sight distance concerns). If a new access is requested that does not meet the spacing criteria to a legal parcel where an existing access already exists, the additional access shall not be approved unless the denial of the new access would create undue hardship on the property owner, as determined by Weld County. Whenever multiple accesses to a single legal parcel exist, and additional accesses are requested, one (1) or more existing accesses must be removed, minimizing new accesses, and utilizing existing accesses. PAGE 46 4944875 Pages: 46 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppel, Clark and Recorder, Wald County , CO 2024-0065 ORD2023-16 NUR iI III F. Access Permit a Condition of Building Permit. 1. When a new or upgraded access location is to be constructed in conjunction with any construction authorized by a building permit, the issuance of an access permit shall be a condition for obtaining a building permit for such construction. 2. When the property owner intends to use a Historical Access Location in conjunction with any construction authorized by a building permit, the property owner shall apply for a new access permit for any existing access location never previously permitted. Unless otherwise required by this Article XIV, such access permit shall not require the closure, relocation, upgrade, or any other physical change to the Historical Access Location and shall be for the purpose of identifying the Historical Access Location. In that circumstance the property owner shall not be charged an access permit application fee. G. Definitions. Access means the physical location where vehicles enter onto a maintained County road right-of-way. Change in Type of Traffic means a change to the type of vehicles that use the existing access location, including, but not limited to, a change from passenger vehicles to semi - trucks, or a change from agricultural equipment to passenger vehicles. Change of Use means a change in how a parcel that accesses onto a County road right-of-way is used, regardless of whether the parcel is within the unincorporated part of the County. Change of Use includes the construction of additional principal structures (e.g. homes, offices, etc.), the increase of intensity of an existing use (e.g. expansion of an existing business, etc.), change in zoning, change in lot lines, creation of new parcels, and other land use changes. Change of Use does not include construction of accessory structures, remodeling of existing structures that does not increase traffic to the site, or similar changes. Historical Access Location means an unpermitted access that was constructed and in -use prior to the date that this Access Code was originally approved, July, 1, 2010. Unless there is a safety concern, Historical Access Locations may continue to be used in the manner they were historically used prior to that date. Any Change of Use, Change in Type of Traffic, increase in amount of traffic, or change to the physical location of the Historical Access Location (e.g. enlarging, reconstructing, paving, or otherwise altering) shall require a new access permit. Illegal Access means an unpermitted access that has been constructed or used when otherwise required to obtain an access permit. Illegal Accesses do not include Historical Access Locations that are used in the manner they were historically used prior to the original approval of this Access Code. Access Approval as a Condition of a Land Use Case. When an existing, or shared access is to be utilized in conjunction with a land use case, the plat map shall identify the PAGE 47 4944873 Pages: 47 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Raoordar, Weld County , CO INIPINAN 'tANI Yoh II II 2024-0065 ORD2023-16 preliminary approved access location prior to recording the plat. The property owner shall apply for an access permit when ready to construct the access and may be required to enter into an improvements and road maintenance agreement. I. — No change. Table 1 — Minimum Access Spacing Criteria (Feet) — No change. Add J. Closure/Upgrade/Relocation of Accesses Presenting Safety Concerns. Weld County has the authority to order an existing access location (whether permitted, historical, or illegal) to be closed, upgraded, or relocated whenever it determines that a significant safety concern exists. Such action shall be made at the property owner's expense. Amend Sec. 8-14-40. Access permit application process. A. Submittal Requirements; Complete Application. An application for an access permit shall be considered complete if it is submitted on the required form, includes all mandatory information, including all supporting materials and is accompanied by the applicable fee. The application must be signed by the property owner or, if applicable, an authorized agent. Written authorization to act on the property owner's behalf may be accepted if the access application is not signed by the property owner. If an application is determined to be incomplete, the Department of Planning Services shall provide written notice to the applicant, along with an explanation of the application's deficiencies. No further processing of the application shall occur until the deficiencies are corrected in a future resubmitted application. An application which is determined to be incomplete may or may not retain its same processing cycle. B. Subdivision or Common Development Plan Access. Upon approval Weld County may require one (1) access permit at the location where the proposed common development plan or subdivision accesses to the County road to reduce the administrative burden on staff and applicants requesting permits concurrently for multiple lots. Such "development access" is subject to a development review application. C. — No change. D. Review Process. The application and information provided by an applicant for an access permit shall be reviewed by Weld County. The application may be reviewed by multiple departments or agencies to verify compliance with any applicable laws and codes. If Weld County finds the information and supporting documentation in the application for an access permit conforms to the policies and requirements set forth in this Article XIV, meets the requirements defined in the Weld County Engineering and Construction Criteria, as shown in Appendix 8-Q, or in other pertinent laws, regulations or ordinances, and that all required fees have been paid, an access permit shall be issued to the applicant. E. Changes in Approved Permit. An approved permit shall not be changed, modified or altered without written authorization from Weld County. All work shall be done in conformance with the approved permit. PAGE 48 4944875 Pogo.: 48 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO 2024-0065 ORD2023-16 Bill Permit Limitations. An approved access permit expires after one (1) year from its date of issuance and requires the permit holder to meet the specifications and general engineering standards of the Weld County Engineering and Construction Criteria, as shown in Appendix 8-Q. The proper Weld County staff shall be responsible for ensuring compliance with such specifications and standards. Remainder of section — No change. Amend Sec. 8-14-50. Permit holder's general responsibilities. A permit holder is responsible to comply with the general provisions of this Code, including temporary accesses permits issued for the following items: Additional requirements and more detailed information are shown in the special provisions of the access permit. A. — No change. B. Traffic Control. Access construction activities should not interfere with traffic on County roadways. If interference with traffic is necessary, a traffic control plan shall be submitted to, and approved by, the Department of Public Works as part of a Right -of -Way Permit application. All traffic control shall conform to the most current version of the Manual on Uniform Traffic Control Devices standards, which is available for review on the Federal Highway Administration website. All regulatory signs require approval of the Board of County Commissioners. If applicable, the permit holder shall be required to install all necessary signage and shall bear all expenses for the fabrication and installation of road name signs, permanent barricades, and signs required as part of a development project (e.g., one way, no parking, no outlet, stop sign, speed limit, etc.). C. — No change. D. Tracking control. Permanent vehicle tracking controls provide stabilized site access where vehicles exit a location onto a paved road. Vehicles are required to perform a complete revolution of all tires prior to entering a County -maintained roadway. Effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles. Commercial, industrial, or high traffic volume accesses shall provide permanent tracking control devices, which include, but are not limited to, double cattle guards or a paved (asphalt/concrete) tracking pad extending three hundred (300) feet into the site to mitigate impacts to the paved road, including damages and/or offsite tracking of mud or other materials. Requests for temporary tracking control techniques must be approved by Weld County prior to installation. Temporary tracking control shall be used during construction unless permanent tracking control is installed ahead of construction activities; such devices include, but are not limited to, crushed natural aggregate (recycled crushed concrete or asphalt shall not be used for any vehicle tracking pads) along with a geotextile fabric or pre -fabricated vehicle tracking pads with approved dimensions. Use -by -right permitted agricultural accesses are exempt from tracking control requirements. Tracking control is required for construction of accesses to prevent tracking from the site onto paved public roadways. The permit holder may be held financially responsible for damage to the roadway resulting from inadequate tracking control. All tracking control devices and PAGE 49 4944675 Pages: 49 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO ��cw�N�aM CIWCkirrgrlIOki, "Ill 2024-0065 ORD2023-16 designs must be in accordance with the Weld County Engineering and Construction Criteria, Appendix 8-Q. E. Access Construction, Restoration and Clean-up. The permit holder is responsible for installation of the correct culvert size(s), materials, and the cost of installation for new access culverts whenever the installation of a culvert is made necessary by the creation of a new access from private property to a county roadway. Accesses should be constructed in a manner that minimizes erosion and does not result in disposition of silt and debris upon the county roadway or roadside ditches. Accesses which slope down toward the County road will be constructed to assure that water does not run onto or across the traveled public way. This may include designing the crown, borrow ditches, pans, or other elements so that they direct water to the existing drainage facilities along the road. The permit holder shall assume all responsibility for removing all debris associated with the access construction activities and restoring the County roadway to pre-existing conditions. The access permit may allow construction of the access without the need for obtaining a separate Right -of -Way Use Permit pursuant to this Chapter. Installation of commercial/industrial access(es) may require a traffic control plan to be approved with the access permit. the permit holder, upon notification from the Departments of Public Works and/or Planning Services, shall correct any items not consistent with the approved access permit within fourteen (14) days. If the permit holder fails to restore the road right-of-way in the manner and to the condition required by the Departments, the County may remove the access or perform the restorations and invoice the permit holder for the expense(s) incurred by the County. F. Access Sight Distance. Sight distance is essential to protect the traveling public at all access points along County roadways. Sight distance is the length of roadway that is clearly visible to the driver and is dependent upon the height of the driver's eye above the road surface, the specified object height above the road surface, and the height of sight obstructions within the line of sight. The minimum sight distance available on a roadway must be sufficient to enable a vehicle traveling at or near the design speed to stop before reaching a stationary object. In evaluating the overall performance of a roadway, both the horizontal and vertical sight distances must be considered. When items such as walls, buildings, bridge piers, cut slopes, or vegetation growth are near the roadway on the inside of a curve, they can block a driver's view of the road ahead. If they are too close, the driver EEE - will not have sufficient distance along the curved roadway to stop when a hazardous ▪ condition comes into view. The minimum requirements and technical criteria for sight • distance are in the Weld County Engineering and Construction Criteria Manual, Appendix z 8-Q. Amend Sec. 8-14-60. Variance from specific access permit requirements. * o U `AIA property owner may request a variance from specific requirements set forth in this Article i6 - XIV. Weld County will consider requests for variances on a case -by -case basis. Requests for o i4= variances may be submitted in a written letter to Planning Services addressing the hardship or aaol._ justification for the variance and supporting documentation to explain why they cannot comply with the requirements of this Article or as outlined in the Weld County Engineering and Construction Criteria, Appendix 8-Q. Requests will be reviewed and acted upon by the Planning �aY Services Director or designee to ensure they will adequately protect the public health, safety, and :4Uy N °'S PAGE 50 a� 4944675 Pages: 50 of 285 2024-0065 �mvl� Ca ly5Kopp•a,024 i2,24 C1. Clerk an1d Recordir,,OWeld County , CO ORD2023-16 �� EirdriqK ��'y� W�� M�� ll�'�hl 'It BIM welfare. Weld County staff will respond with an approval or denial in writing within thirty (30) days of receipt of the variance request. Amend Sec. 8-14-70. Appeal of denial of access permit. If an access permit is denied by Weld County staff, or the applicant objects to any of the terms or conditions of a permit thereby placed by the County, the applicant has the right to appeal the decision to the Board of County Commissioners, in writing, utilizing the appeal procedures set forth in Section 2-4-10 of this Code. Amend Sec. 8-14-80. Enforcement. A. Violations and Penalties. The County, through the Department of Planning Services or other departments so authorized, may enforce this Article XIV through methods included in this Section, or through other methods adopted by the Board of County Commissioners. B. Criminal Penalties. 1. — No change. 2. Whenever the Departments of Public Works and/or Planning Services, through one (1) of its employees, has personal knowledge of any violation of this Article XIV, it shall give written notice to the violator to correct such violation within sixty (60) days after the date of such notice. Should the violator fail to correct the violation within such sixty (60) day period, the Departments of Public Works and/or Planning Services may request that the Sheriffs Office issue a summons and complaint to the violator, stating the nature of the violation with sufficient particularity to give notice of said charge to the violator. The summons and complaint shall require that the violator appear in court at a definite time and place stated therein to answer and defend the charge. One (1) copy of said summons and complaint shall be served upon the violator by the Sheriff's Office in the manner provided by law for the service of a criminal summons. One (1) copy each shall be retained by the Sheriff's Office and Department of Planning Services and one (1) copy shall be transmitted to the Clerk of the Court. The County may install barriers across or remove any access not conforming to this Article XIV during the pendency of the enforcement action. 3. and 4. — No change. C. thru E. — No change. F. Inspections. The Departments of Public Works and/or Planning Services or other County departments may conduct an inspection of each access that is the subject of the access permit to ensure full compliance with all provisions of this Article XIV and the terms of the permit. G. — No change. PAGE 51 4944875 Psges: 31 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopper, Clark and Recorder, Wald County , CO IVIVIICIACIA WNW,11111 2024-0065 ORD2023-16 H. Access Permit Issued Erroneously or Upon Incorrect Information. Any access permit which has been issued in error or on the basis of incorrect information supplied by the permit holder, shall be considered void. In the event an access permit is void, no refund of permit fees shall be made unless the access permit was issued in error by Weld County staff. I. Notice Regarding Illegal Access. For an illegal access, the property owner shall be sent written notice of any illegal access location or use. The owner shall be given sixty (60) days notification of pending actions, after which the County may install barriers across, or remove, any access not conforming to this Article XIV. Any access, driveway or curb -cut being constructed within County road right-of-way without an approved access permit shall be required to stop work immediately and apply for an access permit. If the permit is approved, work may continue subject to the conditions of the permit. If the permit is denied, any work that has been completed must be removed and the road and drainage facilities returned to pre-existing conditions acceptable to the Departments of Public Works and Planning Services, upon completion of any appeal or the time for appeal pursuant to the provisions of Section 8-14-70, above. Amend Sec. 8-14-90. County authority. Notwithstanding the issuance of any access permit or the construction of any access, Weld County reserves the right to make any changes, additions, repairs, conditions, and relocation or closure of any part of an access within the County road right-of-way at any time, including, but not limited to, in connection with the relocation, reconstruction, widening and maintaining of the road or road right-of-way, without compensating the owner of the access for the damages to or destruction of the access. Amend Sec. 8-14-100. Access Control Plans (ACP's), and additional techniques and requirements for access on County roads. A. and B. — No change. C. Access Control Techniques. A reduction in accesses onto a County road will improve traffic flow, operations, and safety of the traveling public. To reduce the number of existing access points, applicants may be required to implement the following access control techniques to reduce conflicts while maintaining adequate access to adjacent land uses. 1. Elimination. Applicants may be required to eliminate accesses identified as unsafe locations, where there are more than two (2) existing accesses for a parcel, or do not meet spacing requirements identified in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q). C.2. thru D. — No change. E. Auxiliary Turn Lanes. Auxiliary lanes maintain the safety, traffic flow, and operation of a roadway or access. Auxiliary lanes are required when unique location factors exist such as roadway speed and traffic density, access volume, the volume of commercial trucks, the influence of nearby accesses, existing auxiliary lanes close to the proposed access, PAGE 52 4944875 Pages: 52 of 285 02/13/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Reoorder, Weld County , CO PriirOFM URII'airniggralarMIAN'iY4 i 11111 2024-0065 ORD2023-16 nearby traffic control devices, available stopping sight distance, and other topographic or roadway design factors. When applicable, the access permit holder is responsible for design, installation, any road right-of-way acquisition needed to accommodate the required lane width. Required auxiliary turn lanes must be installed according to the following traffic triggers: 1. thru 3. — No change. 4. A left turn acceleration lane with transition taper may be required if it would benefit the safety and operation of the roadway. A left turn acceleration lane is generally not required when the acceleration lane would interfere with the left turn ingress movements to any other access. Further auxiliary lane design criteria can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q). F. Closure or Elimination of access. When an access is closed, abandoned or eliminated the permit holder shall assume all responsibility for any activities related to the closure/elimination and reclamation of access points stipulated to be removed. In the event the issuance of an access permit requires an existing access point to be "closed and reclaimed" it shall be completed by the stipulated date on the permit. If the county is closing an access, the property owner will be notified in writing, prior to the closure occurring of the date the County will close the access. Closure and reclamation activities may include, but are not limited to, reestablishing the profile of the burrow ditch, removing any culverts and gates in the fencing adjacent to the maintained road right-of-way, and attempting to reseed the affected area located in the road right-of-way with natural vegetation to the satisfaction of the Departments of Public Works and Planning Services. G. Roadway Improvements. Projects with high traffic/trip generation or safety concerns may require public improvements; including but not limited to, auxiliary lanes, such as acceleration and deceleration lanes, exclusive left or right-hand turn lanes, or a traffic signal, in accordance with the Weld County Engineering and Construction Criteria Manual, as shown in Appendix 8-Q. If these types of roadway improvements are required, the permit holder will be responsible to enter into an improvements agreement with collateral. The agreement shall be approved by the Board of County Commissioners. Remainder of section — No change. ARTICLE XV - Transport Permits Amend Sec. 8-15-40. General provisions. A. thru B.6. — No change. B.7. Travel routes may require build outs of turning radii or other road improvements necessary to accommodate movement of the Vehicle/Load. A Right -of -Way Use Permit may be applicable. Remainder of section — No change. PAGE 53 4944875 Pages: 53 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO IIII Mit*MIAI MMI,1.11KIMMI 1I II 2024-0065 ORD2023-16 Amend Sec. 8-15-50. Transport permits types. The following Transport Permits are available as determined by the Department of Public Works for the movement of Extra -legal Vehicles and Loads on roadways under Weld County jurisdiction: A. thru E. — No change. Delete F. Amend Sec. 8-15-60. Transport permits application information. A. The Maximum Limits authorized for Annual Extra -legal Vehicles or Loads are as follows: 1. — No change. 2. Seventeen (17) feet in Width. Remainder of section — No change. Amend Sec. 8-15-70. Transport permit application process. A. — No change. B. Submittal Requirements. Applicant must submit a complete application form, required submittals, and fee to the Department for review. Required submittals may include, but are not limited to: 1. Route survey and axle configuration drawing. B.2. thru E. — No change. F. Permit Expiration. 1. — No change. 2. Oil Rig Permits expire five (5) days from the date of issuance. 8 Remainder of section — No change. ARTICLE XVI - Vacation of Road Right -of -Way by Board of County Commissioners om�w Amend Sec. 8-16-30. Vacations of public road rights -of -way not within historic townsites Nm3 or subdivisions. :Pak A. Complete petitions for vacation of public road rights -of -way not within historic townsites or subdivisions accepted by the Department of Public Works shall include: aQ4z N a PAGE 54 nNY'� 4944675 Pages: 54 of 285 2024-0065 nm> 02/15/2024 12:24 PM R Fee:$0.00 ORD2023-16 Carly Koppea, Clark and Recorder, Wald County , CO Wis1SIMIy��l�tialll��l�'�GPJti'lKuYL�h II 1. A complete Petition Application signed by the petitioner with an accurate legal description of the road right-of-way requested to be vacated. 2. and 3. — No change. 4. A list of all adjacent property owners within 500 feet or landowners who are not directly adjacent, but may be affected due to usage of the road right-of-way. A.5. thru B. — No change. C. Within six (6) weeks of the petition being received, and at least ten (10) days prior to the meeting at which the Board of County Commissioners is to consider vacating any public road right-of-way, the Clerk to the Board shall mail notice of the meeting to all persons owning land adjacent to the roadway to be vacated, including any landowner who the Department of Public Works reasonably determines may use the road right-of-way proposed to be vacated to access their property. This notice shall not be required if the public road right-of-way has not been used as a roadway for at least twenty-one (21) years or since it was established. Inadvertent errors by the Department of Public Works in determining who should receive such notice, or by the Clerk to the Board's Office in sending such notice, shall not create a jurisdictional defect in the process, even if such error results in the failure of a property owner to receive such notification. Remainder of section — No change. Amend Sec. 8-16-40. Requirements. A. — No change. B. The Board of County Commissioners may approve or deny any request to vacate public road right-of-way as it determines to be in the best interests of the County. The Board may consider any information or evidence it determines appropriate, including, but not limited to, the following, to be provided by the Department of Public Works: 1. — No change. 2. Whether the road right-of-way is a maintained or non -maintained public road, and 3. — No change. 4. Whether there is enough information to determine if the public needs this road right-of-way in the future for items such as utility easements, etc. A title commitment or land survey plat may be required. Remainder of section — No change. Appendix 8-A Reserved — NO CHANGE. Appendix 8-B Road Access Sketches — ATTACHED. Appendix 8-C Cattle Guards —ATTACHED. PAGE 55 4844675 Pages: 55 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and R000rdsr, Weld County , CO 2024-0065 ORD2023-16 101 IPAPK 4IIIIIIIi MAN' AN' li 'Ef 1I 111 Appendix 8-D Dust Controls and Seasonal Adjustment Factor — ATTACHED. Appendix 8-E Weld County MS4 Area — ATTACHED. Appendices 8-F — 8-J. Reserved — NO CHANGE. Appendix 8-K 1-25 Corridor Plan — ATTACHED. Appendix 8-L Roadside Memorial Sign Application — NO CHANGE. Appendix 8-M Memorial Signs — NO CHANGE. Appendix 8-N Transportation Plan — NO CHANGE. Appendix 8-O Functional Classification Map — NO CHANGE. Appendix 8-P Right -of -Way Use Permit — ATTACHED. Appendix 8-Q Weld County Engineering and Construction Criteria — ATTACHED. BE IT FURTHER ORDAINED by the Board that the Clerk to the Board be, and hereby is, directed to arrange for Municode to supplement the Weld County Code with the amendments contained herein, to coincide with chapters, articles, divisions, sections, and subsections as they currently exist within said Code; and to resolve any inconsistencies regarding capitalization, grammar, and numbering or placement of chapters, articles, divisions, sections, and subsections in said Code. BE IT FURTHER ORDAINED by the Board, if any section, subsection, paragraph, sentence, clause, or phrase of this Ordinance is for any reason held or decided to be unconstitutional, such decision shall not affect the validity of the remaining portions hereof. The Board of County Commissioners hereby declares that it would have enacted this Ordinance in each and every section, subsection, paragraph, sentence, clause, and phrase thereof irrespective of the fact that any one or more sections, subsections, paragraphs, sentences, clauses, or phrases might be declared to be unconstitutional or invalid. The above and foregoing Ordinance Number 2023-16 was, on motion duly made and seconded, adopted by the following vote on the 8th day of January, A.D., 2024. BOARD OF COUNTY COMMISSIONERS WELD COUNTY, COLORADO ATTEST: o demkt •.jdo•,c Weld County Clerk to the Board AP j4JfrR{ tiiavdc Deputy Clerk to the Board ounty Attorne Date of signature: Z'6[Z`U ORM: (AYE) Kevin ! ' oss, Chair Perry L. Buc/, Pro-Tem Mike Freeman Scoti!'K. James 4944675 Pages: 56 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clark and Recorder, Wald County , CO 1111 ranImVRl � ��L��1� «!'�Y4 11111 AYE (AYE) (AYE) NAY 2024-0065 ORD2023-16 First Reading: Publication: December 4, 2023 December 10, 2023, in the Greeley Tribune Second Reading: December 20, 2023 Publication: December 24, 2023, in the Greeley Tribune Final Reading: January 8, 2024 Publication: January 14, 2024, in the Greeley Tribune Effective: January 19, 2024 PAGE 57 4944676 Pages: 57 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Reoorder, Weld County , CO 1111IIFJI'MAIL/MCNOLI'#IIhhl kkirMYI 11III 2024-0065 ORD2023-16 CHAPTER 8 - Public Works APPENDIX 8-B ROAD ACCESS SKETCHES DELETE APPENDIX 8-B IN ITS ENTIRETY - RESERVED 4844875 Pages: 58 of 285 02/15/2024 12:24 PM R F.s:$0,00 Carly Koppae, Clerk and Reoordar, Weld County , CO VIII I �.rl�4'�N�G+I�II�y I�W�N�4=144wI Gl nik, i'JL lyi „III Weld County, Colorado, Charter and County Code (Supp. No. 851 Created: 2023-11-07 14:42:52 [EST] Page 1 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS AMEND APPENDIX 8-C CATTLE GUARDS 4944675 Pages: 59 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clark and Reoorder, Weld County , CO VIII INPJNYIKINILI NC ROM WI:101VA 111111 Weld County, Colorado, Charter and County Code (supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 2 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS U y _i 2 a c L (Snmi 11110-4 COS II N0 J 41m 4.1.ti O -.c r L NALL O W aa Sa4--a CPI am CL It'll 0 N : r a soNo 'll n crQ L dam' a o Date: PUBLIC WORKS DEPARTMENT 1111 H STREET, P.O. BOX 758 GREELEY, COLORADO 80632 WEBSITE: WWW.CO.WELD.CO.US PHONE: (970) 304-6496 FAX: (970) 304-6497 CATTLE GUARD INSTALLATION/RELOCATION REIMBURSEMENT AGREEMENT By signing this document, you have agreed to reimburse Weld County Public Works for materials to install a 16', 24', or 32' wide Cattle Guard. The Cattle Guard location is on CR between CR/Hwy and CR/Hwy at tenths of a mile N, S, E, or W of CR/Hwy Cattle Guard design shall be in accordance with Weld County specifications and details. Installation will be done by a Weld County Public Works crew at the agreed location. Payment is required prior to installation. A price breakdown: Cattle Guard width Foot:Total $ Landowner(s): (please print) (signature) (please print) (signature) Landowner Address: Landowner Phone: Weld County Representative Title ** Sign one copy and send the signed copy with payment to Weld County Public Works at P.O. Box 758, Greeley, Colorado, 80632 4944675 Pages : 60 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppes, Clerk and Recorder, Weld County , CO III FdrxhIrr��PrIraR4�tiFcni�uoctifnx+� IIIr Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 3 of 24 II CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #1 os• se - o Iva is FIE 4-4 �0 so 0 i— �c mem a v• mg N e go CD a. Nmin b_ CDg� ctso� O N t Act CC CC Ca a CV X -00 CONSTRUCTION DETAILS W C CC 0 a - W8 x 18 STRINGER 8' LONG a w 3D "v - 4944673 Pages: 61 of 285 02/15/2024 12:24 PM R Fnn:$0.00 Carly Koppes Clerk and Recorder, Weld County , CO III )PjjJ%jI IYdE41NI�Y��iIMh�1�'hlli�hY4� III I M to Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 4 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #1 (cont'd) TYPICAL FOR ALL CONNECTIONS BASE AaC BASE NOTES OPPOSITE HANG BOLTING PATTERN FOR SECTION A a C RESPECTIVELY. 4944675 Pages: 62 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopp.., Clerk and Reoordar, Wald County , CO mr,inpArlialoteirrvaivie:iiii1.1114 "Ill Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 5 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #2 CONCRETE BASE PLAN VIEW CROSSBAR C 'O a 20.7 CHANNEL W 8 a 17 STRINGER e2jC-C CROSSBAR M Ll L1 L] L 1 L3 II STRINGER W 8 a IT—, m CONERETE BASE 1 NO.4 BARS WITH 4 i/2 /2"COVER. ) SECTION A -A CROSSBAR DETAIL 4944875 Pages: 63 of 285 02/15/2024 12:24 PM R Fes:$0.00 Carly Koppa.,Clerk Iand Recorder, Weld County ,, CO IIIIIff�ff�rl �f��lllll I�Tlff<f If1T17Iftrrll'fafl f�l�� If<RI ,I �� NO- 4 STURRIPS AT IB�CC WITH Z. -COVER. CATTLE GUARD DESIGNED DON CARROLL CHECKED DREW SC111 G APRCNED WAYNE SMYTH WELD COUNTY ENG INEERINc DATE MARCH 31, MIN Weld County, Colorado, Charter and County Code (Sapp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 6 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #2 (cont'd) i 4944675 Pages: 64 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppel, Clark and Recorder, Wald County , CO IIIII Kali lal1G all' kalhi'k4 lialli h 1I II Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 7 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #3 CROSS BAR 6' TYPICAL WHERE > 346 D CROSSBAR OR STRAPS OR STRINGERS CONTACT 3' I/4" c 2 • STRAP �z'•o"z 7=9' ;-2--5/8“ —WS STRINGER 9 LON CENTER STRINGER SPACING DETAIL SUPER- STRUCTURE GENERAL NOTES= SUPER STRUCTURE TO BE SUPPLIED IN TWO SEPERATE 12-0* BY 7.-9.• UNITS. ALL CONCRETE REINFORCING BARS TO BE CONTINUOUS. NO SPLICING OR LAPPING IS ALLOWED. ALL BOLTED CONNECTIONS ARE TO BE DOUBLE NUTTED. ALL ANCHOR BOLTS, NUTS, WASHERS AND CLIPS ARE TO BE GALVANIZED . MATERIALS SHALL MEET THE STATE DEPARTMENT OF HIGHWAYS, DIVISION OF HIGHWAYS, STATE OF COLORADO, STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION, 1991 OF THE FOLLOWING SECTIONS. SEC 309.03 STRUCTURAL CARBON STEEL (ASTM A361 SEC 601.02 CONCRETE (CLASS Al SEC 709.01 REINFORCING STEEL (GRADE 40) 4944675 Pages: 85 of 285 02/15/2024 12:24 PM R Fos :$0.00 Carly Koppel, Clark and Raoorder, Wald County , CO VIII Illrandl l'1leI PICEVIlMhr NMEI' MCP II Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 8 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #4 3/4 E ANCHOR BOLTS WITH 4" CF THREAD. TYPICAL AT ALL CONNECTIONS. ANCHOR DETAI L 3/8"PLATE 4 1/2 13/6.DIA. HOLE �- ANCHOR CLIP DETAIL 3/8 PLATE'ti,ti 3" 2- 4944675 Pages: 66 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppel, Clark and Raoordor, Wald County , CO MON, Ill II Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 9 of 24 CHAPTER 8 - Public Works APPENDIX 8-D DUST CONTROLS AND SEASONAL ADJUSTMENT FACTOR DELETE APPENDIX 8-D IN ITS ENTIRETY - RESERVED 4944676 Pages: 67 of 285 02/15/2024 12:24 PM R F.s:$0.00 Carly Kappa.. Clerk and Recorder, Wald County , CO iv 1fAMMIL1ValrirldNfihNilifilimk 11111 Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:53 [EST] Page 10 of 24 CHAPTER 8 - Public Works APPENDIX 8-E Weld County MS4 Area DELETE APPENDIX 8-E IN ITS ENTIRETY - RESERVED 4944675 Pages: 68 of 285 02/15/2024 12:24 PM R Fee:00.00 Carly Keeps., Clerk and Recorder, Weld County , CO 11111 KOPP k' ! NEUiakiYkh 11111 Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-0714:42:53 [EST] Page 11 of 24 CHAPTER 8 - Public Works APPENDIX 8-K DELETE APPENDIX 8-K IN ITS ENTIRETY - RESERVED 4944675 Pages: 69 of 285 02/15/2024 12:24 PM R Fet:$0.00 Carly Kappae, Clark and Recorder, Weld County , CO VIII kiraililudlitlINI'llIftdallardlehilii II II Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 12 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA APPENDIX 8-P RIGHT-OF-WAY USE PERMIT The intent of the Right -of -Way Use Permit is to regulate and permit the use of Weld County's public right-of- way by private companies, municipalities and/or special districts constructing and burying lines either crossing or running parallel within Weld County right-of-way. Crossings are allowed for all lines. Parallel installations are allowed for lines of "public utilities" that are defined in CRS 40-1-103 and are "domestic or foreign electric light power, gas, or pipeline companies" holding current Certificates of Public Convenience and Necessity issued by the Colorado Public Utilities Commission; for water lines of municipalities, water districts, and water and sewer districts; for transmission lines or pipelines used solely for agricultural purposes; for fresh water above -ground transfer pipelines; for lines in non -maintained right-of-way if approved by Weld County based upon locational factors, such as, surrounding population density, topography, or if the right-of-way provides access to a recorded exemption lot, and with Permittee's agreement to move the line at its sole expense if Weld County or an annexing municipality intends to improve the right-of-way; or if authorized by the Board of County Commissioners in an appeal of the denial of a Right -of -Way Permit application, pursuant to Weld County Code Section 8-13-110. Public right-of-way subject to regulation by the Right -of -Way Use Permit includes Weld County's maintained and non -maintained, and all public drainage easements. A Right -of -Way Use Permit grants the Permittee and its Contractors permission to occupy designated County right-of-way. The Permit authorizes excavation, surveying, and/or construction of facilities within the County right-of-way and provides for their subsequent restoration upon completion of the Project. The Permit is issued solely for the Permittee's and its Contractor's construction of the Project. Permittee is prohibited from changing the use of the Project in any way without first obtaining a new permit. SUBMITTAL REQUIREMENTS 1. Complete application. Permittee must submit a complete Right -of -Way Use Application and include required submittals for review and consideration of its Project. If the Project is approved, a Right -of -Way Use Permit will be issued to the Permittee. It is the Permittee's responsibility to inform its Contractor of all Permit requirements, Provisions, and attached Special Provisions. 2. Drawing, plan set, and map. A drawing, plan set and map are required to be submitted with the Application. Detailed plan(s), sketch, and/or map(s) showing the work location and roadway, edge of roadway, County ROW lines and width, at least one crossroad, and a legend. It is preferred, that drawings be 11x17 or capable of being printed out in 11 x 17. All underground installations must include a cross section drawing showing depth of line being installed per County requirements based on the lowest point of the County ROW and show the County ROW width Engineer stamped plan and profile drawings are required for underground installations running parallel within a roadway. Drawings at intersections must be in plan and profile, and shall be at a scale of 1:100 or as determined by the Department of Public Works. 3. Traffic Control Plan. A Traffic Control Plan (TCP) or Method of Handling Traffic (MHT) must be submitted and approved prior to Permittee's commencement of work. Permittee shall provide all necessary traffic control in accordance with the Manual on Uniform Traffic Control Devices (MUTCD) in drawing form; narratives will not be accepted. (a) Flaggers shall be required at any locations where there is encroachment into a travelling lane. (b) Full road closure requests must be prepared by and signed by a Traffic Control Supervisor (TCS). (c) Full road closures exceeding three (3) days shall require approval of the Board of County Commissioners. 4. Insurance. Permittee and/or its Contractor shall secure and maintain insurance policies and/or provide proof of adequate self-insurance that will protect itself, its sub -contractors, members of the public who Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST, Page 13 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA use the right-of-way associated with the Project, and Weld County, Colorado, from claims for bodily injury, death, or property damage which may arise from the construction of the Project, or caused by the facilities which are constructed as permitted herein. The Board of County Commissioners of Weld County, Colorado, its officers, and employees must be named as an "Additional Named Insureds" in all liability insurance policies secured by the Permittee and/or its Contractor. The following insurance policies and amounts are required. Certificates of insurance evidencing such policies shall be delivered to the Weld County Department of Public Works: (a) Statutory Worker's Compensation. (b) Contractor's public liability and property damage in the following sums: Bodily Injury: Property Damage: Each person I $1,000,000 $1,000,000 Each accident Each accident $1,000,000 Aggregate $2,000,000 (c) Automobile public liability and property damage in the following sums: Bodily Injury: Property Damage: Each person I $1,000,000 Each accident $1,000,000 Each accident $1,000,000 5. Bonding and Surety. If determined necessary by Weld County's Department of Public Works, Permittee shall provide a surety bond or other security for the total amount required to restore the right-of-way under which the Project is to be installed or constructed, based upon current Weld County Department of Public Works contract prices for the performance of such work. Said collateral shall remain in effect for a period of two (2) years after inspection of completed construction by Weld County Department of Public Works. Whether or not covered by a bond, Permittee shall reimburse Weld County for all expenses incurred by it as the result of, or related to, the failure by Permittee or its Contractor to perform all installation, construction, maintenance or other work pursuant to this Permit in a workmanlike manner. 6. Geotechnical Submittals. The Weld County Department of Public Works reserves the right to request from Permittee geotechnical submittals if deemed necessary. The grant of this Permit is conditioned upon Permittee's and its Contractor's compliance with the General Provisions, Construction Provisions, Pipeline Provisions (if applicable), and General Matters set forth below. By accepting this Permit, Permittee and its Contractor agree to comply with the terms and conditions set forth herein. GENERAL PROVISIONS 1. Permit Required. (a) Commencement of construction prior to receiving an approved Permit will result in applicable penalties (see emergency repair section for exclusions listed as item number 12). (b) Contractor must have a copy of this Permit on site during construction of the Project. (c) This Permit requires commencement of construction within three (3) months from date issued unless otherwise stated. The Permittee may apply for an extension if work is not completed before the expiration of three (3) months. All applicable fees must be paid before extension will be issued. 2. Inspection. Inspection of work performed in Weld County right-of-way is required. The Weld County Department of Public Works must be notified 48 hours prior to commencing all work within Weld County Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42,4 [EST] Page 14 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA right-of-way. Final inspections are required. Weld County shall have the right to order Permittee or its Contractor to stop work anytime Weld County believes that a violation of this Permit has occurred or if there is a danger to the safety of the public if the work continues. 3. Additional Permits. Permittee shall be responsible for obtaining all other state, federal, or local permits which may be required of Permittee and/or its Contractor to install and/or maintain its Project. Permittee shall provide evidence of such other permits upon request by the Weld County Department of Public Works. 4. Determination of Placement. Weld County reserves the right to determine the specific placement of the Project or lines within its right-of-way. 5. Suspension of Work. Weld County's Department of Public Works shall have the authority to suspend work, wholly or in part, because of the failure of Permittee to properly execute the work in accordance with this Permit. Notwithstanding the issuance of this Permit, Weld County reserves the right to make or to require Permittee to make any changes, additions, repairs or required relocation of any facilities within the dedicated right-of-way at any time. 6. Setback Requirements. By accepting this Permit, Permittee hereby waives its right to require industry setback requirements which it might otherwise require from other utilities which may be placed in Weld County's right-of-way and relinquishes its authority over the placement of all other electric, power, gas, communications or other conduits, pipelines, appurtenances, or irrigation structures which Weld County may allow to be placed in its Right-of-way. Weld County must approve location prior to construction. 7. Compliance with Utility Notification Requirements. Permittee and/or its Contractor shall comply with all applicable requirements of C.R.S. §§ 9-1.5-101, et seq., and be responsible for locating all existing utilities and registering all new lines with 811. Contact the Utility Notification Center of Colorado at 811 or 1- 800-922-1987 at least two days in advance of digging. Markers and flags are valid for 30 days. Permittee must remove all utility locates such as flags and marker pins from the right-of-way once the construction is complete. Any subsurface utility engineering notification sent to the Colorado Notification Association shall also be sent to the Weld County Department of Public Works. 8. No Damage to Other Projects. No culverts, irrigation structures, drain lines, utility lines, or any other Projects or facilities within the right-of-way are to be cut or damaged. In the event Permittee or its Contractor damages an existing facility, Permittee shall first notify the owner and either immediately repair and replace the damaged facility or pay the owner to repair and replace the same in accordance with the desires of the owner. 9. Emergencies. Permittee shall report all emergency repairs to Weld County Public Works immediately upon being advised that an emergency exists. During such repairs, Permittee shall utilize proper traffic control measures. Permittee shall apply for a Right -of -Way Use Permit and make the required repairs as soon as practicable after the Weld County Department of Public Works is notified of the emergency situation and the need for such repairs. In no event shall such repairs be completed later than 24 hours after receiving such notification, unless adverse weather conditions prohibit the repair process. 10. Changes Made to the Right-of-way - Permittee's Financial Responsibility. In the event changes are made by Weld County to the right-of-way or appurtenances within the right-of-way that would necessitate removal or relocation of the Project, Permittee shall do so promptly at its own expense upon the request of Weld County. 11. Permittee Responsible for All Project Related Expenses. The construction, operation, maintenance and repair of the Project constructed by Permittee, and all other improvements described in this Permit, shall be at its own expense and without the aid or use of Weld County funds. Weld County, Colorado, Charter and County Code (Stipp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 15 of 24 (e) CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA 12. Permittee Solely Responsible. Permittee or its successors and assigns, remains solely responsible for all matters pertaining to the Project and all costs associated with or pertaining to the Project. These responsibilities include, but are not limited to, the following: repair and maintenance of the physical components of the Project; removal of the physical components of the Project upon retirement of the use or following the request of Weld County to remove the Project; cooperation with Weld County and other Permittees whose projects are placed in Weld County's right-of-way. 13. Successors and Assigns of Permittee. It is mutually understood and agreed that this Permit and all the terms and conditions hereof shall extend to and be binding upon the Permittee and its successors, and assigns. CONSTRUCTION PROVISIONS 1. Road Crossings. All underground installations crossing maintained or non -maintained Weld County roadways and road rights -of -way shall be by directional bore unless otherwise approved by Weld County Public Works. 2. Parallel Installations. Parallel installations within the untraveled portion of Weld County road right-of- way may be performed by bore, trenching, plowing, drilling or excavation. Parallel installation methods within the traveled portion shall be determined by the Department of Public Works. 3. Bridge Structures. (a) No lines shall be attached or otherwise placed along or upon any Bridge structure or wing walls. (b) No continuous line shall be installed crossing under a bridge structure. (c) Underground projects installed parallel to a bridge structure must maintain a minimum clearance of five feet (5') from all wing walls and pilings. 4. Minimum Cover for County Road Right -of -Way Installations. All depth requirements are minimums and are subject to approval or modification by the Department of Public Works based on engineering and safety standards and existing utilities in the road right-of-way. In no event shall any facilities be installed in Weld County road right-of-way at depth less than four feet (4') from top of line measured from the lowest point of the road right-of-way. (a) Dry utilities shall be installed at a minimum depth of four feet (4') from top of line measured from the lowest point of the road right-of-way (flowline). (b) Wet utilities shall be installed at a minimum depth of six feet (6') from top of line measured from the lowest point of the road right-of-way (flowline). (c) All types of oil and gas lines shall be installed at a minimum depth of ten feet (10') from top of line measured from the lowest point of the road right-of-way (flowline). Concrete surfaces shall be crossed at a minimum depth of fifteen feet (15') from top of line measured from the lowest point of the road right-of-way (flowline). (d) All line types crossing non -maintained road right-of-way shall be at a minimum depth of four feet (4') from top of line measured from the lowest point of the road right-of-way (flowline). Culverts must have a minimum of twelve inches (12") of cover. 5. Daily Construction Requirements. At the end of each day during the installation and construction of the Project, Permittee shall observe the following requirements: (a) Working hours allowed under this Permit are from Sunrise to % hour prior to Sunset. Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 16 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA (b) All materials shall be removed a minimum of ten feet (10') from outside edge of the road shoulder. (c) All excavations upon the traveled portions of the road right-of-way shall be back -filled in accordance with the compaction requirements set forth below unless otherwise approved by Weld County. (d) All traffic signs must be in place per the approved Traffic Control Plan or removed or covered if not applicable to nightly activities. 6. Equipment Movement and Equipment Crossings. (a) Movement of cleated or track equipment is restricted to the immediate work area. Equipment shall be transported to a proper unloading area. No cleated or track equipment may work on or move over any road way surface without mats. (b) Equipment crossings shall require a separate permit and must meet safety and sight distance criteria for approval. Crossings are in line with the Project and shall be built up level with the road surface with a practicable anti -tracking material to prevent damage to the road surfaces and shoulder areas. Crushed concrete is prohibited for use as a surface material. A minimum of a twelve -inch (12") culvert shall be placed in ditch areas under tracking pad to maintain proper drainage. Existing ditch and upstream and downstream culverts must be observed in determining appropriate drainage culvert size. 7. Site Markers. Permittee shall mark the site of the construction of the Project, whether permanent or temporary, with markers acceptable to Weld County Department of Public Works. Markers shall be placed as far from edge of road as to not interfere with normal road maintenance. 8. Future Line Location. The installation of non-ferrous lines in the road right-of-way shall require a suitable means to facilitate future line location such as, but not limited to, metallic warning tape installed above the line and registration with 811. 9. Concrete Surfaces. There is a strict no cut policy on all concrete surfaces, which includes potholing. Any damage or cutting of concrete surfaces will result in the Permittee being responsible for the cost of a full replacement of concrete panel(s) by a Contractor approved by Weld County. Bore grout may be required for underground crossings of concrete surfaces. 10. Asphalt Surfaces. Asphalt surfaces are not to be cut unless approved by the Weld County Department of Public Works. If an asphalt surface cut is granted, the cut shall be repaired with a flowable fill cement (refer to Section 11. Compaction Requirements, below) and hot bituminous pavement and/or concrete placed at a thickness of existing plus one (+1). 11. Compaction Requirements. (a) All compaction of backfills and road surfaces shall be compacted in accordance with the most current versions of the Colorado Department of Transportation (CDOT) Standard Specifications for Road and Bridge Construction and Field Materials Manual. (b) All backfills located within an existing asphalt surface or under the asphalt not currently in place but will be as part of a new road construction, must be compacted using flow -fill cement in the upper three feet (3') of backfill. (c) If any wet or non-compactable materials are produced from excavations, they shall be completely removed from the road right-of-way and replaced with compactable materials. The road right-of- way shall then be returned to the original grades and cross sections. Weld County Department of Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 17 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA Public Works shall have the authority to determine what materials shall be discarded and what materials shall be acceptable as replacement. (d) On gravel roads where excavation materials are stacked on the road surface, road base of 1.5 inch surface gravel as specified in Chapter 9 of the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q) specifications for surface gravel shall be spread over the entire road surface at a minimum depth of six inches (6") upon completion of the work. Shoulders on paved roads or barrow ditches where excavation is done shall require a minimum of four inches (4") of N -inch Class 6 aggregate road base material. Recycled Concrete will not be substituted for Class 6 aggregate road base. These amounts are minimums and do not supersede any requirements within the Permit. (e) On gravel roads where excavation is done within the roadway, backfilling lifts greater than eight inches (8"), but not exceeding twelve inches (12"), shall be permitted providing that Permittee has suitable equipment to properly compact the depth of lift placed. Weld County Public Works shall determine if Permittee's equipment and the depth of backfill lift is appropriate. Ninety-five percent (95%) of a standard proctor shall be required at any trench depth or in replacement of any materials within the traveled portion of the road right-of-way. Eighty-five percent (85%) of a standard proctor shall be required at any trench depth or in replacement of any materials off the traveled portions of the road right-of-way. Installations running parallel within a gravel roadway will require a final placement of a minimum of six inches (6") of surface gravel after all of the Project has been placed and compaction test results are in compliance. (f) Potholes in gravel surfaces shall be filled completely with road base and compacted. Potholes in asphalt shall be filled with a cement/grout to existing thickness plus 1 (+1) or filled with a compactable base material and the final placement a HMA or concrete material of existing thickness plus one (+1). Cold patching material is not an acceptable method of restoration. 12. Reseeding. Permittee shall reseed, with a seed mix approved by Weld County Department of Public Works, all areas within the road right-of-way in which vegetation was removed or disturbed during the installation of its Project. 13. Points of Access. Permittee shall install manholes and other points of access to underground lines within the boundaries of the road right-of-way outside the normal wheel path of the roadway so that they do not obstruct maintenance operations within the road right-of-way. Permittee shall, at its sole expense, adjust access points, when requested to do so by Weld County. 14. Survey Monuments. Permittee or its Contractor shall preserve or replace all survey monuments or benchmarks at each work site. If such monuments or bench marks are destroyed, Permittee shall hire a registered land surveyor to replace destroyed monuments or bench marks. If Permittee chooses to preserve such monuments or benchmarks, it shall also hire a registered land surveyor to complete such preservation. 15. Permittee's Obligations Regarding Surveys. (a) All surveying performed within the boundaries of the road right-of-way shall be conducted with proper safety equipment and advanced warning signs; (b) Surveying permit holders can be issued an annual permit. (c) Any excavation within the boundaries of the road right-of-way will be backfilled with the same material or better than what was excavated. Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 18 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA (d) Weld County Department of Public Works offers free monument boxes and lids to Permittee to establish, upgrade or perpetuate the location of an aliquot corner of any section on a paved road. Permittee shall furnish the location of the section corners being preserved to the Department of Public Works when obtaining monument boxes. 16. Permittee's Obligations Regarding the Completion of Project. (a) Permittee shall place surface gravel, as specified in Chapter 7 of the Weld County Engineering and Construction Criteria, on all surfaces where any damage has occurred to the road surface from equipment, trenching, or storage of material. Weld County shall determine the damaged areas, remedial work required, and timing of said work. (b) Permittee shall complete road restoration including, but not limited to, clean-up (including utility markers), repair of damaged facilities, trench compaction, and replacement of gravel shall be kept within one (1) mile of new excavation. (c) All disturbed portions of the road right-of-way or damaged road surfaces are to be returned to their original condition prior to demobilizing. If the road right-of-way is not returned to original conditions, Weld County may perform or contract such remedial work and Permittee shall pay for all work or forfeit its surety bond in order to pay for all work done. (d) Permittee shall own, maintain, operate and repair any line installed or constructed herein in accordance with the regulations, conditions and terms of this permit. No lines installed within County rights -of -way may be abandoned by the owner at any time. Although the lines may be retired, they may not be abandoned and all responsibility for such lines remains with the owner. The County does not recognize, nor accept, any lines designated by any other source as abandoned, and the County will continue to expect such lines to be maintained or removed by the Permittee. 17. Line Retirement. Retirement of lines in Weld County road right-of-way are still required to be located as part of 811. If Weld County approves a line to be retired, the retirement of an existing line in the road right-of-way shall be subject to conditions as determined by the Weld County Department of Public Works based on the age, condition, material type, and size. Permittee shall cut, cap, and fill lines that are not required to be removed. 18. Line Abandonment. If Permittee desires to abandon a line from being located as part of 811 notification, Permittee shall completely remove the line from Weld County road right-of-way, unless otherwise approved by Weld County. 19. Drainage Interference. Permittee shall not obstruct the natural free and clear passage of water along the roadside ditch flow lines or other waterways. If surface drainage is to be affected, Permittee is responsible for the proper disposition of the runoff. PIPELINE PROVISIONS 1. Natural Gas/Crude Oil Pipelines. (a) Road crossings for natural gas/crude oil pipelines must be by directional bore, only. (b) Above -ground appurtenances and/or equipment are not permissible for installation within the County road right-of-way and must comply with setback requirements. 2. Permanent Fresh Water (Non -Potable) Pipelines. (a) Road crossings for permanent fresh water (non -potable) pipelines must be by directional bore, only. Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 19 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA (b) Permanent fresh water (non -potable) pipelines must extend past future road right-of-way prior to daylighting. (c) Above ground appurtenances and/or equipment are not permissible for installation within the County road right-of-way and must comply with setback requirements. (d) Weld County approval is required for any change of use or retirement of a permanent fresh water (non -potable) pipeline. 3. Temporary Above -Ground Transfer Pipelines. (a) Above -ground transfer pipelines are allowed as a temporary use for a period of 6 months or less for both road crossings and parallel installations. See the limitations and restrictions set forth below depending upon crossing methods. (b) Above -ground transfer pipelines may transfer fresh or recycled water and dairy irrigation slurry, only. (c) The source of water must be disclosed on the Right -of -Way Use Application and location maps. (d) The use of non -maintained Weld County road right-of-way for temporary above -ground transfer pipelines shall be negotiated with the landowner(s). Existing driveway culverts may not be used for water transfers and permission from property owner must be provided for crossing private driveways or accesses. (f) All pipelines or lay flat pipes occupying the road right-of-way (running parallel to the roadway) must be secured up out of the ditch flowlines and away from the road edges. They may not interfere with normal road maintenance or impede drainage. All accesses and driveways shall be accessible and cannot be blocked by lay flat lines. Trailer mounted pumps shall be placed on private property and must be maintained and re -fueled on private property. Crossing methods for temporary above -ground transfer pipelines: 1) Plate/Manifold: Applicable for untreated gravel roadways for a transfer duration of 10 days or less. (e) b. Must be covered with 11/2" surface gravel with a minimum of 15 -foot road base tapers on each side. All forms of traffic must be able to safely cross the plate/manifold. c. Traffic control signs required including a speed reduction to 15 mph for the duration of the transfer. d. Permittee is required to maintain the crossing which includes 24 -hour snow removal in winter. 2) Culvert Sleeve: a. Applicable for longer term transfers crossing untreated gravel roadways only. b. Maximum culvert size is an 18" outside diameter for a single line transfer and 24" outside diameter Elliptical for a double line transfer unless approved by the Weld County Department of Public Works. c. Minimum of 18" of 1.5" surface gravel cover on culvert. Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 20 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA d. Compaction tests of road base is required after culvert is removed if flowable fill is not used for final restoration of the roadway. 3) Existing Culverts: Requests for use of existing County culverts (any culvert crossing under a County maintained roadway or intersection) are subject to special review. Use is for a maximum of 15 days. b. Existing culverts are not available for use from March through October. c. Driveway/access culverts are not available for use. d. If the culvert also serves for irrigation, written permission from the Irrigation or Ditch Company may be required. e. Culvert must be cleared anytime drainage is impeded due to run-off or flooding or a significant rain or flooding event is forecasted. Shut off valves should be placed on each side of culvert to allow for disconnection and removal. 4) HDPE or PVC Pipe: a. Applicable for longer term transfers where a paved, hard surface, or treated gravel roadway must be crossed. b. Pipeline installation is required to be at a depth of 10 feet based on the lowest point in the County ROW and ends must extend past future road right-of-way before daylighting. Installation method by boring only. c. Weld County approval is required for any change of use or retirement of the pipeline. 4. Produced Raw Water Pipelines. (a) No temporary above -ground transfers. (b) Pipelines will only be considered for approval that are transferring to a State and County approved injection or recycling facility. (c) Casing is required for crossing under County roadways. (d) Casing type may be determined by the Permittee or its Contractor. (e) Casing maximum outside diameter is not to exceed 12". (f) Casing ends must extend outside of the County road right-of-way. (g) If Flex Steel Pipe or equivalent with a temperature rating of 180 degrees or higher is used, casing requirement will be waived. (h) Maximum size of the produced water pipeline is not to exceed 8" and not to exceed 10" outside diameter (OD). Requests for larger diameter pipelines will require special review by the Weld County Department of Public Works. (i) Location markers shall be green in color and must list "produced water" and an emergency contact number. GENERAL MATTERS Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 21 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA 1. Terms. (a) All references herein to "Right -of -Way" refer to a portion of land that is dedicated or granted to and accepted by Weld County for transportation purposes, such as a paved or gravel roadway or highway whether maintained or unmaintained by Weld County. The term is used as both singular and plural. (b) All references herein to "Permittee" are to any persons and/or entities applying for and being issued this Right -of -Way Use Permit granting permission to construct their Project within Weld County's right-of-way. (c) All references here to "Lines" means all underground and overhead cable, telephone, electric, power, wire, gas and irrigation lines, and/or appurtenances, structures or pipelines. (d) All references herein to "Contractor" are to any persons or business entities retained by Permittee to install the Project in Weld County right-of-way. All references herein to "Permit" refer to this Right -of -Way Use Permit, including all Permit requirements, Provisions, and attached Special Provisions. 2. Weld County's Limited Interest in Right -of -Way. Weld County owns a limited interest in the right -of- way and therefore, does not, by the issuance of this Permit, warrant its ownership of the right-of-way. Permittee is responsible for determining the ownership of properties traversed by its lines, the location of all property boundary lines, and the ownership of all right-of-way. Therefore, Permittee shall obtain from the fee title owner(s) of the right-of-way or others having proprietary interests in the right-of-way such authority or rights as Permittee may need, in addition to this Permit for Permittee's use of the right- of-way. Permittee acknowledges and agrees that the authorization granted herein by Weld County is subject to Permittee's securing such authority or rights. 3. Rights Reserved by Weld County. Permittee acknowledges and agrees that the Right -of -Way which are the subject of this Permit exist as public right-of-way for the primary benefit of the travelling public, and that the rights granted in this Permit to the Permittee are subject to Weld County's rights and obligations to preserve and maintain the right-of-way and the public's right to continue to travel safely upon the right-of-way. (0) (a) Subject to the right granted herein to Permittee, Weld County reserves the remaining use of the Right -of -Way for existing and future construction, operation, maintenance, repair, replacement relocation and abandonment of its own use and facilities. (b) Weld County reserves the right to revoke this Permit at any time if Permittee or its Contractor fails to comply with the requirements of this Permit. Should this Permit be terminated for non- compliance by Permittee or its Contractor, any lines or facilities installed prior to the termination shall remain the responsibility of the Permittee and may be removed or maintained by Permittee at the sole discretion of Weld County. (c) This Permit is non-exclusive. Weld County reserves the right to allow other public and private utilities and entities to utilize the subject right-of-way and may impose location requirements and restrictions on Permittee in anticipation of requests by future public and private utilities and entities to occupy the right-of-way. (d) Weld County reserves the right to reconstruct, widen and/or maintain the right-of-way which are the subject Permit. In the event this work requires Permittee to incur expenses to preserve, re- locate or maintain its Project, Permittee shall do so upon notification from Weld County at its sole cost. Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 22 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA 4. Indemnification. Except for the negligence of Weld County, Permittee shall indemnify and save harmless Weld County, its officers, employees, agents, successors and assigns from any damage or loss sustained by them or any of them, which arises by reason of Permittee's negligence with respect to the installation, upgrade and/or maintenance of the Project. 5. Hold Harmless. Permittee agrees to protect Weld County and save and hold Weld County harmless from any and all third -party claims and damages which the installation and/or maintenance of Permittee's Project and related facilities may directly or indirectly cause. Additionally, Permittee releases Weld County from any and all claims and damages to property owned by Permittee resulting from any act, either by or on the part of Weld County or by or on the part of any third -party. 6. No Assignment. Permittee shall not assign any or all of its rights under this Permit without first obtaining written consent to such assignment from Weld County, which consent shall not be unreasonably withheld. However, in the event Permittee contracts with a third -party Contractor to perform the work associated with the installation of the Project, Permittee remains solely responsible for Contractor's compliance with the terms and conditions of this Permit. 7. Entire Permit Agreement. The parties hereby agree that neither has made or authorized any agreement with respect to the subject matter of this instrument other than expressly set forth herein, and no oral representation, promise, or consideration different from the terms herein contained shall be binding on either party hereto, or its agents or employees. This Permit embodies all agreements between the parties hereto and there are no promises, terms, conditions, or obligations referring to the subject matter whereof other than as contained herein. 8. Effect of Invalidity of Provision. If any term or provision of this Permit, or the application thereof to any erg 8y person or circumstances shall, to any extent, be held invalid or unenforceable, the remainder of this Permit, or the application of such terms or provisions, to a person or circumstances other than those as to which it is held invalid or unenforceable, shall not be affected, and every other term and provision of o5c this Permit shall be deemed valid and enforceable to the extent permitted by law. a�oa; 9. No Waiver of Immunity. No term or condition of this Permit shall be construed or interpreted as a waiver, Na3 express or implied, of any of the immunities, rights, benefits, protections or other provisions, of the Colorado Governmental Immunity Act §§ 24-10-101 et seq., as applicable now or hereafter amended. coop 10. No Third -Party Beneficiary. It is expressly understood and agreed that the enforcement of the terms and conditions of this Permit, and all rights of action relating to such enforcement, shall be strictly reserved to Weld County and nothing in this Permit shall give or allow any claim or right of action whatsoever by dn! any other person not included in this Permit. It is mutually understood and agreed that this Permit and SIT all the terms and conditions hereof shall extend to and be binding upon the Permittee and its successors � and assigns. N p. abY'r SPECIAL PROVISIONS re .= This Permit may be subject to additional Special Provisions. Such Special Provisions are attached hereto. Permittee Signature: Printed name: Date: 4044675 Pages: 80 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Wald County , CO 11111 Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 23 of 24 APPENDIX 8-Q WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA 4944676 Pages: 81 of 285 02/15/2024 12:24 PM R Fe.:$0.00 Carly Koppaa, Clerk and Racordsr, Weld County , CO 11111rd170101414Mittli lalkfillia Mk 11111 This page intentionally left blank. 4944678 Pages: 82 of 285 02/15/2024 12:24 PM R Fee:00.00 Carly Kopp., Clerk and Recorder, Weld County , CO IIII NIMMICAliitifriffir I. nriliJAN, id till TABLE OF CONTENTS Chapter 1 General Provisions 1 1.1 Title 1 1.2 Purpose and Background 1 1.3 Applicability 1 1.4 Reference Documents 1 1.5 Interpretation 2 1.6 Road Acceptance 2 1.7 Improvements Agreements 3 Chapter 2 Road Classifications and Typical Sections 4 2.1 Road Classification System 4 2.1.1 Functional Classifications 4 2.1.2 Primary vs Secondary Classifications 5 2.2 Right -of -Way Widths 5 2.3 Right -of -Way Use Permit 5 2.4 Right -of -Way Determination 5 2.5 Right -of -Way Acquisitions 6 2.6 Typical Cross -Sections 6 Chapter 3 Surveying 17 3.1 Survey Data - require a survey control sheet 17 3.2 State Plane 17 3.3 Monument Boxes 17 3.4 Road Safety 17 Chapter 4 Roadway Design Criteria 18 4.1 General 18 4.1.1 Policy on the Use of Referenced Publications 18 4.1.2 Typical Plan Set Guidelines 18 4.1.3 Design Speed 21 4.2 Horizontal Alignment 22 4.2.1 Horizontal Curves 22 4.2.2 Superelevation 23 4.2.3 Transitions 23 4.2.4 Cross Slope 24 4.3 Vertical Alignment 24 4.3.1 Maximum and Minimum Grades 24 4.4 Sight Distance 25 4.4.1 Stopping Sight Distance 25 4.4.2 Passing Sight Distance 27 4.4.3 Decision Sight Distance 27 4.4.4 Intersection Sight Distance 28 4.5 Intersections 29 4.5.1 Alignment and Profile 29 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE l i 4.5.2 Corner Radii 30 4.5.3 Approval Requirements 30 4.5.4 Auxiliary Lanes 31 4.6 Cul-de-Sacs 31 4.7 Bridges 31 4.7.1 Bridge Hydraulic Capacity 31 4.7.2 Freeboard 32 4.7.3 Bridge Scour 33 4.7.4 Use of HEC-RAS 33 4.7.5 Bridge Railing 33 4.7.6 Minimum Structural Requirements 33 Chapter 5 Drainage Criteria 34 5.1 General 34 5.2 Drainage Law 35 5.3 Drainage Policy 35 5.3.1 Submittal Requirements 35 5.3.2 Data Collection 37 5.4 Rainfall 37 5.4.1 Intensity Duration Curves for Rational Method 37 5.5 Runoff 38 5.5.1 The Rational Method 39 5.5.2 Larger Basin Rainfall Methods 45 5.6 Roads, Inlets, and Storm Drains 45 5.6.1 Applicable Software 45 5.6.2 Roadway Drainage 45 5.6.3 Inlets 46 5.6.4 Pipes 46 5.6.5 Manholes 47 5.7 Open Channels, Roadside Ditches, and Grass Swales 48 5.7.1 Applicable Software 48 5.7.2 Open Channels and Swales 48 5.7.3 Roadside Ditches 52 5.8 Culverts 53 5.8.1 Applicable Software 53 5.8.2 Sizing 53 5.8.3 Materials 54 5.8.4 Cover 54 5.8.5 End Sections and Safety Grate 54 5.8.6 Maintenance 55 5.9 Riprap 55 5.10 Storage 62 5.10.1 Retention 62 5.10.2 Detention 63 5.10.3 Dam Information 73 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I ii 5.10.4 Irrigation Ditches/Private Irrigation Systems 74 5.11 Stormwater Drainage Criteria Variances 75 5.12 Oil and Gas Stormwater Management 76 Chapter 6 GRADING and MS4 Requirements 77 6.1 Erosion Control AND Grading Requirements 77 6.1.1 Applicability 77 6.1.2 Grading and Erosion Control Plans 77 6.1.3 Implementation 78 6.1.4 Grading Permit Deadline & Extension 78 6.1.5 Tracking Control 79 6.2 MS4 Requirements 81 6.2.1 Designated MS4 Areas and Responsibilities 81 6.2.2 Applicability of MS4 Requirements 82 6.2.3 Required Permits 82 6.2.4 MS4 Requirements for Pm -Construction 83 6.2.5 MS4 Requirements for Construction Activity 85 6.2.6 MS4 Requirements for Post Construction 86 6.2.7 MS4 Requirements for As -Built Drawing Checklist 90 6.3 Revegetation 90 6.3.1 Site Preparation 90 6.3.2 Seeding and Planting 91 6.3.3 Mulching 91 6.3.4 Maintenance 91 6.3.5 Erosion Protection Design Criteria 92 Chapter 7 FEMA Floodplain Requirements 93 7.1 Background Information 93 7.2 Floodplain Management Obligations 93 7.3 FEMA Floodplains 93 7.3.1 Floodplain Requirements 93 Chapter 8 Traffic Criteria 95 8.1 Traffic Impact Studies 95 8.1.1 Traffic Impact Study Area 95 8.1.2 Preliminary Traffic Impact Analysis 95 8.1.3 Traffic Impact Study Requirements 96 8.1.4 Traffic Impact Study Checklist 100 8.1.5 Updating Existing Traffic Impact Studies 101 8.2 Change in Access Use 102 8.3 Temporary Access 102 8.4 Traffic Control Devices and Plans 102 8.4.1 Signage and Striping Plans 102 8.4.2 Striping guidance 103 8.4.3 Type and Location of Signs 103 8.4.4 New Roadway Signage 103 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE Lill 8.4.5 Memorial Sign Applications 103 8.4.6 Construction Criteria 104 8.5 Access Points 104 8.5.1 Local Roadways 104 8.5.2 Collector Roadways 105 8.5.3 Arterial Roadways 105 8.5.4 State Highway and Interstate Systems 105 8.5.5 Shared Accesses 105 8.5.6 Restricted Movement Access 106 8.5.7 Access Control Plans 106 8.6 Access Design 106 8.6.1 Geometric Design 106 8.6.2 Access Sight Distance 107 8.6.3 Subdivision Roads Sight Distance 108 8.7 Auxiliary Turn Lanes 109 8.7.1 Auxiliary Lane Length 111 8.7.2 Storage Lengths 112 8.7.3 Auxiliary Lane Conflicts 113 8.8 Access Construction 113 8.8.1 Gravel Requirements 113 8.8.2 Pavement Requirements 114 8.8.3 Access Drainage 114 8.8.4 Structures 114 8.9 Average Daily Traffic Count 114 8.9.1 Vehicle Classification 115 Chapter 9 Soil Investigation and Pavement Design 117 9.1 Introduction and Purpose 117 9.2 Field Investigation and Soil Samples 117 9.2.1 Testing Frequency 117 9.2.2 Sampling Procedures 117 9.3 Subgrade Testing 117 9.3.1 Classification 117 9.3.2 Swell Test 118 9.3.3 pH and Sulfate 118 9.3.4 Moisture Density 118 9.3.5 Hveem Stabilometer 118 9.4 Pavement Design Criteria for Onsite Roadways 118 9.4.1 Design Equivalent Single Axle Loads (ESAL) 119 9.4.2 Traffic Equivalence Load Factors 119 9.4.3 Traffic Growth Rate 119 9.4.4 Lane Factor 119 9.5 Flexible Pavement Design 120 9.5.1 Serviceability and Reliability 120 9.5.2 Standard Deviation 120 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE ( iv 9.5.3 Drainage Factor 120 9.5.4 Strength Coefficients 120 9.5.5 Pavement Thickness 121 9.5.6 Pavement Design 121 9.6 Material Specification 121 9.6.1 General 121 9.6.2 Procedure for Material Source Approval 121 9.6.3 Hot Mix Asphalt 122 9.6.4 Portland Cement Concrete Pavement 123 9.6.5 Aggregate Base Course 123 9.6.6 Aggregate Surface Course (Gravel) 124 9.7 Soils/Pavement Design Report 125 Chapter 10 Construction Criteria 126 10.1 General 126 10.1.1 Policy on the Use of Referenced Publications 126 10.1.2 Control of Work and Inspection 126 10.1.3 Project Acceptance and Warranty 127 10.2 Contractor Responsibilities 127 10.2.1 Qualifications, Insurance Requirements, and Licensing 127 10.2.2 Pre -Construction Meetings 128 10.2.3 Permits 128 10.2.4 Public and Worker Safety 128 10.2.5 Utility Coordination 129 10.2.6 Dust Control 129 10.2.7 Traffic Control 130 10.2.8 Removal of Unacceptable or Unauthorized Work 130 10.2.9 Record Drawings and Record Keeping 131 10.3 Materials Quality Control and Testing 132 10.3.1 Qualifications of Testing Personnel and Laboratories 132 10.3.2 Minimum Testing Types and Frequencies 132 10.3.3 Material Sources and Sampling 132 10.3.4 Required Submittals 133 10.3.5 Soils Reports and Pavement Designs 133 10.3.6 Materials Rejection 133 10.4 Excavation and Embankment 134 10.4.1 Utility Trenching and Backfill Requirements 134 10.4.2 Unsuitable Materials 134 10.4.3 Moisture and Density Control 134 10.5 Subgrade Construction Methods 135 10.5.1 Unsuitable Materials 135 10.5.2 Soft Spots 135 10.5.3 Moisture and Density Control 135 10.5.4 Subgrade Proof Rolling 135 10.5.5 Treated Subgrades 136 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE Iv 10.6 Base Course Construction Methods 136 10.6.1 Gradation and Moisture and Density Control 136 10.6.2 Base Course Proof Rolling 137 10.6.3 Treated Base Courses 137 10.6.4 Acceptance Prior to Paving 138 10.7 Pavement Construction Methods 138 10.7.1 Pre -Paving Meetings 138 10.7.2 Recycled Asphalt Pavement Surfaces 138 10.7.3 Hot Mix Asphalt Surfaces 138 10.7.4 Concrete (PCCP) Surfaces 139 10.7.5 Pavement Cut and Patching Requirements 142 10.8 Structures and Drainage Features 143 10.8.1 Bridges 143 10.8.2 Culvert and Pipe Installation 143 10.8.3 Curbs, Gutters and Crosspans 143 10.8.4 Concrete Structures, Manholes, and Inlets 144 10.8.5 Retaining Walls and Slope Stabilization Measures 144 10.9 Other Roadway Features 144 10.9.1 Pavement Markings 144 10.9.2 Traffic Control Devices (Signs and Signals) 144 10.9.3 Trees and Plantings 145 10.9.4 Sidewalks and Trails 145 10.9.5 Guardrails 145 10.9.6 Fences 145 10.9.7 Cattle Guards 146 Chapter 11 Permitting 147 11.1 Transport Permit 147 11.2 Right -of -Way Use Permit 147 11.3 Access Permit 147 11.4 Grading Permit 147 11.5 Floodplain Development Permit 148 Chapter 12 Variance Requests 149 LIST OF FIGURES Figure 2-1 Rural Local and Collector Roads (Unpaved) (Interim) 9 Figure 2-2 Rural Local (Ultimate) 10 Figure 2-3 Rural Collector (Paved) 11 Figure 2-4 Rural Arterial 12 Figure 2-5 County Highway 13 Figure 2-6 Urban Local 14 Figure 2-7 Urban Collector 15 Figure 2-8 Urban Arterial 16 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I vi Figure 4-1 Horizontal Curve 22 Figure 4-2 Minimum Tangent from Intersection 23 Figure 4-3 Intersection Cross Slope Detail 24 Figure 4-4 Horizontal Sight Distance 26 Figure 4-5 Crest Vertical Curve 27 Figure 4-6 Departure Sight Triangles at Intersection (Stop Control) 29 Figure 4-7 Typical Intersections 30 Figure 5-1 Weld County Watersheds 35 Figure 5-2 Manning's n vs. Depth for Low -Flow Section in a Composite Channel 51 Figure 5-3 Manning's n vs. VR for Two-Retardances in Grass -Lines Channels 52 Figure 5-4 Riprap Apron Detail for Culverts In Line with the Channel (USDCM, Vol 2 Figure 9-34) 57 Figure 5-5 Expansion Factor for Circular Conduits (USDCM, Vol 2 Figure 9-35) 58 Figure 5-6 Expansion Factor for Rectangular Conduits (USDCM, Vol 2 Fig 9-36) 59 Figure 5-7 Riprap Erosion Protection at Circular Conduit (Valid for Q/D2.5<6.0) (USDCM, Vol 2 Figure 9-38) 60 Figure 5-8 Riprap Erosion Protection at Rectangular Conduit Outlet (Valid for Q/WH1.5<8.0) (USDCM, Vol 2 Figure 9-39) 61 Figure 5-9 Water Quality Capture Volume (WQCV) Based on BMP Drain Time (USDCM, Vol 3 Fig 3-1) 66 Figure 5-10 Outlet Structure Plan and Profile Example 69 Figure 5-11 Emergency Spillway Typical Design 71 Figure 8-1 Access Approach 107 Figure 8-2 Departure Sight Triangles at Access (Stop Control) 108 Figure 8-3 Subdivision Road Sight Distance Triangle 108 Figure 8-4 Auxiliary Lanes Layout 109 Figure 8-5 Geometric Components of a Deceleration Lane 110 Figure 8-6 Geometric Components of an Acceleration Lane 111 Figure 8-7 FHWA Vehicle Classification (CDOT M -E Pavement Design Manual, Figure 3.6) 116 0 U LIST OF TABLES Table 2-1 Typical Cross Sections Summary (Rural) 7 aom Table 2-2 Typical Cross Sections Summary (Urban) 8 Nm3 Table 4-1 Roadway Design Criteria 21 c wa Table 4-2 Stopping and Passing Sight Distances and K Values 26 aL m R Table 4-3 Decision Sight Distance 28 4;2 Table 4-4 Design Frequencies 32 RY Table 5-1 Runoff Coefficient Equations for Weld County/2008 MHFD (HSG-a) 39 GNU Table 5-2 Percentage Impervious Values for Weld County 40 '"~�- 7-6 Table 5-3 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-A) 41 ilia Table 5-4 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-B) 42 W.11 �ti Table 5-5 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG C/D) 43 hill '\iTable 5-6 NRCS Conveyance Factor, K 44 Table 5-7 Inlets for Weld County 46 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G E ( vii Table 5-8 Theoretical Capacity of Inlets for Weld County 46 Table 5-9 Manhole Sizes 47 Table 5-10 Roughness Coefficients ("n") for Channel Design (After Chow 1959) 50 Table 5-11 Trapezoidal Channel Design Guidance/Criteria 52 Table 5-12 Maximum HW/D Requirements for Weld County 54 Table 5-13 Classification and Gradation of Ordinary Riprap 62 Table 5-14 Drain Time Coefficients for WQCV Calculations 66 Table 5-15 WQCV Outlets Orifice Plate Perforation Sizing 67 Table 5-16 Non -Jurisdictional vs Jurisdictional Dam Criteria Summary 73 Table 8-1 Updating an Existing TIS 102 Table 8-2 Minimum Intersection and Access Spacing Criteria (feet) 104 Table 8-3 Access Geometry 106 Table 8-4 Auxiliary Lane Requirements 110 Table 8-5 Components of Speed Change Lane Lengths for Rural Highways (R -B) from State Highway Access Code 112 Table 8-6 Acceleration/Deceleration Lane and Taper Design Criteria and Redirect Taper for Through Lanes 112 Table 8-7 Grade Adjustment Factors for Acceleration Lanes 112 Table 8-8 Auxiliary Lane Storage Lengths 113 Table 8-8 Traffic Count Seasonal Adjustment Factors 115 Table 9-1 Test Requirement and Frequency 118 Table 9-2 Equivalence Load Factors (CDOT M -E Pavement Design Manual, Table H.2) 119 Table 9-3 Lane Factors (Modified from CDOT M -E Pavement Design Manual, Table 3.3) 119 Table 9-4 Serviceability 120 Table 9-5 Reliability Factor 120 Table 9-6 Drainage Factor 120 Table 9-7 Strength Coefficient 121 Table 9-8 Master Range Table for Hot Mix Asphalt from Table 703-4 in CDOT's Standard Specifications for Road and Bridge Construction 122 Table 9-9 Concrete Aggregate Gradation Table from Table 703-1 in CDOT's Standard Specifications for Road and Bridge Construction 123 Table 9-10 Aggregate Base Course Requirements 124 Table 9-11 Aggregate Surface Course Requirements 125 Table 10-1 Pavement Marking Types on Asphalt and Concrete Roadways 140 LIST OF APPENDICES Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F Appendix G Weld County Drainage Basin Map Drainage Report Checklist CDOT Operations and Maintenance Plan Guidelines As -Built Drawing Checklist USDCM 2007 Runoff Coefficients Rational Formula -Based Modified FAA Procedure Grading Permit Checklist WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I viii Appendix H Appendix I Appendix J MS4 Pollution Prevention Plan Checklist and Manual Traffic Impact Study Checklist Weld County Standard Details 4944875 Pages: 91 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopp., Clark and Recorder, Wald County , CO 1111 PAPPdilil'i *UNA Ball 'M«Y h II II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE lix This page intentionally left blank. 4944675 Pages: 92 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Wald County , CO VIII NU��G�II�P� +��IWU PHI%114111111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE Ix CHAPTER 1 GENERAL PROVISIONS 1.1 TITLE This manual is called the Weld County Engineering & Construction Criteria and will be referred to throughout the text as the WCECC. 1.2 PURPOSE AND BACKGROUND Communities and counties often provide engineering criteria for the repair and construction of infrastructure, outlining specific "must build" requirements. In Weld County, Colorado, which covers 4,000 square miles, the range of soil types and site conditions is so varied that it is not practical or advisable to develop specific requirements. In Weld County, one size does not fit all. However, recognizing the need in the engineering community for basic information about the County's criteria for acceptable infrastructure, the County has developed this document. It outlines design and material options and guidelines for the design, construction, location, improvement, and maintenance of infrastructure in Weld County. The criteria outlined in this manual are intended to provide the designer with guidance to facilitate the development of infrastructure that is well suited to County needs and is safe, efficient, and economical. Some cases may arise where conformance to these criteria will be exceptionally difficult. In such cases, requests for variance to these criteria will be considered on a case -by -case basis. The overriding requirement is that all improvements must be designed and constructed with professional integrity and quality at the forefront. Additionally, designs will consider sustainability (reuse of existing materials where practical) and long-term total cost of ownership through life -cycle cost analysis. 1.3 APPLICABILITY The WCECC applies to all lot dividers, developers, landowners, and owners of facilities adjacent to or located in the County's rights of way or easements —and to the employees, agents, or contractors of these entities —when they design, construct, and maintain facilities or conduct other activities subject to review and approval under the provisions of the Weld County Code. The WCECC also applies to the County and its employees, agents, and contractors. V 1.4 REFERENCE DOCUMENTS The WCECC hereby adopts the latest versions of the following documents by reference. However, some �ma of these references represent nationwide and statewide standards, respectively, which do not always NO3 satisfy County conditions. When standards differ, the instructions and guidance in this manual will c govern. v�� MLL tl1 �� American Association of State Highway and Transportation Officials (AASHTO) A Policy on y E i 2 Geometric Design of Highways and Streets o�ar aN i AASHTO Guide for Design of Pavement Structures Nv ..� AASHTO Roadside Design Guide lu E AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Np_ m N Y z. Testing d * . AASHTO Standard Specifications for Highway Bridges iiilial WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 1 AASHTO Load & Resistance Factor Design (LRFD) Bridge Design Specifications AASHTO LRFD Bridge Construction Specifications American Society for Testing and Materials (ASTM) Annual Book of ASTM Standards Colorado Department of Transportation (CDOT) Access Control Plans • CDOT Bridge Design Manual • CDOT Construction Manual • CDOT Drainage Design Manual • CDOT Field Materials Manual CDOT M&S Standard Plans CDOT M -E Pavement Design Manual CDOT Roadway Design Guide • CDOT State Highway Access Code CDOT Standard Specifications for Road and Bridge Construction with Weld County Special Revisions (aka Weld County Department of Public Works Conformed Standard Special Revisions to COOT'S Standard Specifications for Road and Bridge Construction) CDOT Survey Manual Colorado Revised Statutes Relevant Federal Emergency Management Agency (FEMA) documents • Federal Highway Administration (FHWA) Manual on Uniform Traffic Control Devices (MUTCD) • FHWA Roundabouts: An Informational Guide (NCHRP Report 672) • FHWA Railroad/Highway Crossing Grade Handbook FHWA Real Estate Acquisition Guide for Local Public Agencies ("The Uniform Act") Institute of Transportation Engineers (ITE) Trip Generation Manual Mile High Flood District (MHFD) Urban Storm Drainage Criteria Manual (USDCM) o MHFD is formerly Urban Drainage and Flood Control District (UDFCD) • Transportation Research Board (TRB) Highway Capacity Manual • Weld County Code • Weld County Transportation Plan 1.5 INTERPRETATION This manual presents the basic criteria that must be met to ensure that infrastructure facilities are safe, efficient, economical, and appropriate for use in the County. Where minimum values are stated, greater values for safety, durability, or functional limits are encouraged whenever practical and consistent with federal, state, and local requirements. Situations might arise where the application of individual criteria from the WCECC will not ensure the protection of public health, safety, and welfare. Accordingly, Weld County may choose not to accept the infrastructure for taxpayer -funded maintenance; may impose additional or more stringent criteria than those contained in the WCECC; or may require the modification of plans, specifications, or operations to protect public health, safety, and welfare. 1.6 ROAD ACCEPTANCE Acceptance of a road for maintenance by the County is at the discretion of the Board of County Commissioners (BOCC) and requires passage of a resolution. The Weld County Road Acceptance Policy requirements are available in Section 8-6-150 of the Weld County Code. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 12 1.7 IMPROVEMENTS AGREEMENTS Subdivisions, Planned Unit Developments, Final Plats, Uses by Special Review (USR) and Access Permits may require the developer to sign an improvements agreement with the County and provide collateral to guarantee the improvements are completed as required for one or all the following reasons: Off -site public improvements Road Maintenance Agreement Construction Maintenance Agreement Access Improvements Agreement On -site improvements for subdivisions/PUDs More information can be found in Chapter 8, Article II, of the Weld County Code. An Improvements and Road Maintenance Agreement will detail the approved haul route(s), outline when offsite improvements will be triggered, and include a maintenance agreement for the haul routes. Possible mitigations included in the road maintenance agreement may include, but are not limited to, dust control, specified haul routes, damage repairs, and future improvement triggers. An example agreement is available at: https://www.weld.gov/files/sharedassets/public/v/1/departments/public-works/documents/usr-spr- perm its-im provements-agreement-template.pdf Weld County uses the Equivalent Single Axle Load (ESAL) methodology when calculating an Improvements Agreement proportional share. The ESAL methodology is a national standard for normalizing traffic counts to reflect the actual damage caused by large vehicles. The ESAL method data is as follows: *Add factors & equation. 4944875 Pagss: 95 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Keepss, Clerk and Recorder, Weld County , CO II III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE ( 3 CHAPTER 2 ROAD CLASSIFICATIONS AND TYPICAL SECTIONS 2.1 ROAD CLASSIFICATION SYSTEM The County classifies roadways based on their function and whether they are urban or rural. These two classifications help designers determine the appropriate design characteristics for the road, including cross section and geometric standards. The functional classifications and urban/rural classification consider anticipated traffic volume and access requirements on a road and determine the minimum right-of-way required. Together, these classifications help determine the minimum level of service (LOS). They are a rational, cost-effective basis for the selection of geometric criteria within the range of values available to the designer. The BOCC adopts a Road Classification Map by ordinance and reviews it every two years. Changes made between the two-year reviews typically are based on development reviews and are made on a case -by - case basis via a public hearing process. The current Weld County Functional Classification Map can be found on the Public Works Department's Transportation Planning web page. In addition, the Weld County Transportation Plan includes recommendations for when to modify road classifications. 2.1.1 Functional Classifications Function is determined based on the degree to which a roadway provides access and allows mobility. Roadways provide access when they allow travelers to easily reach most of the destinations within a given area. Roadways provide mobility when they allow travelers to easily go longer distances. The classification of Weld County roads is comprised of a hierarchy of roadways whose functional classifications are defined by their usage. The relative degree to which a road serves these functions defines its functional classification. Roads in Weld County are classified as Arterial, Collector, Local, or Private Roads. The functional classifications of roadways used by Weld County are described below. 2.1.1.1 Arterials A county highway refers to a highway defined in House Bill 16-1155. In Weld County a county highway is a four -lane controlled -access arterial road intersecting with an interstate highway, United States numbered highway, or State Highway. Roads that were annexed before the County's designation of the road as a county highway also may be included by intergovernmental agreement (IGA) with the municipality. Weld County has designated Weld County Road 49 (WCR 49) between Interstate 76 (1-76) and U.S. Highway 34 (US 34) Weld County Parkway, and Weld County Road 47 (WCR 47) from the Parkway to State Highway 392 (SH 392) as county highways. See the Weld County Functional Classification Map, available on the County's Transportation Planning webpage. The county highway designation means Weld County will govern all substantive aspects of the road, including access, maintenance, traffic control, speed limits, and overweight limits, even if municipalities later annex the road. Arterials provide good mobility, carrying significant traffic volumes at high speeds for long distances. They are seldom spaced at closer than one -mile intervals and serve to connect larger communities. The primary difference between interstate highways and arterials is access. Interstate highways have fully controlled accesses with no at -grade intersections, while arterials include limited at -grade intersections. 02/44675 85 15/2024 12:24�PBM RRe6 of 0 00 Carly Kopper, Clerk and Reoorder, Weld County CO X1111 ��11�1E�II.��1� �'�Iw� � �DIGIF I al 'fil�ti 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE ( 4 2.1.1.2 Collectors Collectors link local roads with the arterial road system and connect smaller communities. Both mobility and access are of equal importance on these roadways. Travel speeds and volumes are moderate, and distances traveled are short to medium. Traffic on collector roads typically has an origin or destination within the nearby area. Weld County has both paved and unpaved collector roads. 2.1.1.3 Local Roads ▪ Local roads primarily provide access to adjacent land in rural and urban areas. Local roads are closely spaced and carry relatively lower traffic volumes for short distances. They generally are internal to —or 2 serve an access function for —a residence, farm, single neighborhood, or development. Generally, they 0.- should lead traffic to a collector road. a"' 2.1.1.4 Privately Maintained Roads zR Weld County may review privately maintained roads that are planned to be used by the public, such as a road within the boundaries of a residential subdivision, but the roads will be maintained by a ao a • NO3� homeowner's association (HOA) or other private entity. a mad I,: og 2.1.2 Primary vs Secondary Classifications o, $ i.;4 In addition to classifying roads by function, Weld County classifies roads as Primary or Secondary per ME c (C.R.S.) § 43-2-101. ▪ Primary roads usually serve more developed areas and diverse uses (e.g., bicyclists, pedestrians, on- street parking, etc.). Primary roads usually are paved, with curbs, gutters, and sidewalks. Often, they .NYs 1E connect to an existing stormwater drainage system rather than making use of roadside ditches (which r -a> are found commonly beside rural roads). .3- ell Secondary roads primarily serve less developed areas and lower volumes of vehicular traffic. Most of the roads in Weld County are classified as secondary. However, roads that are in municipal Urban Growth Boundaries may be classified as urban/primary. 2.2 RIGHT-OF-WAY WIDTHS The minimum right-of-way widths are as follows, unless otherwise approved by the BOCC: Arterial 140 feet Collector 80 feet Local 60 feet 2.3 RIGHT-OF-WAY USE PERMIT Permits are required when working within the County road right-of-way. More information can be found in Section 11.2 of this document. See also Weld County Code, Chapter 8, Article XIII, Sec. 8-13-10, et seq. It is not the intent to allow new private irrigation systems to be located within County road right-of-way. 2.4 RIGHT-OF-WAY DETERMINATION On October 12, 1889, the BOCC declared all section and township lines on the public domain of the United States in Weld County to be public highways with the intent of constructing roadways on these WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE ( 5 lines. With this order and for this purpose, the BOCC also established 30 feet of road right-of-way on each side of the section or township line (a total of 60 feet). Sections not included in the public domain are railroad sections, school sections (usually 16 and 36), and sections patented prior to October 12, 1889. Not all County roads are a result of the 1889 Resolution. Many Weld County rights of way have been conveyed by landowners through road petitions and dedications, as well as Weld County acquisitions working with landowners. Due to topography, cost, and other factors, not every county road is situated within the 60 -foot road right-of-way and/or centered on the section line. In some places, additional right-of-way has been acquired or reserved. The right-of-way section of the Public Works web page discusses this in more detail. The County recommends that designers review this information and also do their own research into right of way in the areas of their projects. The Weld County right-of-way road files are located in the office of the Clerk to the Board at 1150 O Street in Greeley, Colorado. Please call (970) 400-4225 to set up a time to come in. 2.5 RIGHT-OF-WAY ACQUISITIONS Acquisition of road right-of-way will substantially follow the Real Estate Acquisition Guide for Local Public Agencies published by the FHWA, the Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970, 42 United States Code (U.S.C.) Ch. 61 (the "Uniform Act"), and Title 38 of the Colorado Revised Statutes (CRS). 2.6 TYPICAL CROSS -SECTIONS While it is important to try to preserve the ultimate road right-of-way, funding availability does not always allow for construction of the ultimate section and, in such cases, an interim section should be constructed until funding becomes available. The Public Works Department determines whether a road is designed to the interim or ultimate (or combinations thereof) road cross section. This determination is based on funding, existing and projected traffic volumes, connectivity, continuity, mobility, and capacity. If only a portion of the ultimate cross section is being constructed, the interim design will need to allow for eventual widening of the road to the ultimate cross section. The interim design should ensure that the first phase of the roadway will not need to be removed to complete the full cross section. Storm drainage designs and floodplain analysis will be considered and be constructed to accommodate the ultimate section, unless written approval is obtained from the Public Works Department. All designs should consider how the roadway is used, long-term traffic predictions, location and density of nearby development, and topographical characteristics. A roadway constructed to the ultimate cross section still may require more right-of-way and roadway width in the future for additional lanes, pedestrian or bicycle facilities, landscaping, utilities, or construction requirements, such as cut or fill slopes. Designers should try to anticipate such needs. Other chapters within this manual will discuss design considerations in more detail. Table 2-1 (Rural Conditions) and Table 2-2 (Urban Conditions) summarize some of the features incorporated into the typical cross section drawings for the different road classifications. Figure 2-1 through Figure 2-8 present examples of typical cross section drawings for interim and ultimate roadway types found in the County. Note that the tables and typical sections in this manual usually reflect minimum requirements. The Public Works Department may impose additional requirements on a case - by -case basis. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 16 4947589 Pages: 99 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Kopp., Clark and Reoorder, Weld County , CO II Table 2-1 Typical Cross Sections Summary (Rural) Roadway Classification Right -of -Way Width (min.) Road Surface Number of Travel Lanes (min.) Travel Lane Width (min.) Shoulder Width (min.)/Type Median Width (min.)/Type Drainage Type Sidewalk Width (min.) RURAL ROADS (INTERIM) Arterial 140 ft Paved 2 12 ft 6 ft Paved 2 ft Gravel N/A Roadside Ditch N/A Collector 80 ft Paved 2 12 ft 4 ft Paved 2 ft Gravel N/A Roadside Ditch N/A Collector (Unpaved) 80 ft Gravel 2 12 ft 2 ft Gravel N/A Roadside Ditch N/A Local (Unpaved) 60 ft Gravel 2 12 ft 2 ft Gravel N/A Roadside Ditch N/A RURAL ROADS (ULTIMATE) County Highway 140 ft Paved 4 12 ft 8 ft Paved 2 ft Gravel 16 ft Paved Roadside Ditch N/A Arterial 140 ft Paved 4 12 ft 8 ft Paved 2 ft Gravel 0 ft to 28 ft Paved or Unpaved Separation Roadside/Median Ditch or Storm Sewer N/A Collector 80 ft Paved 2 12 ft 6 ft Paved 2 ft Gravel 0 ft to 16 ft Paved Roadside Ditch N/A Local 60 ft Paved 2 12 ft 1 ft Paved 1 ft Gravel N/A Roadside Ditch N/A Non -maintained Local - Residential 30 ft Unpaved RAP 2 10 ft 2 — 5 ft Gravel N/A Roadside/Utility Ditch Culverts need to be located outside of ROW on landowner property N/A Non -maintained Local — Residential 30 ft Unpaved Gravel 2 13 ft 2-2 ft Gravel N/A Ditch swale Culverts need to be located outside of ROW on landowner property N/A WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (7 4947589 Pages: 100 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Koppel, Clark and Recorder, Weld County , CO Table 2-2 NEVIS pp .mo Nit O� � i FN o. • �: ma aa(N sue_ � o Typical Cross Sections Summary (Urban) Roadway Classification Right -of -Way Width (min.) Road Surface Number of Travel Lanes (min.) Travel Lane Width (min.) Shoulder Width (min.)/Type Median Width (min.)/Type Drainage Type Sidewalk Width (min.) URBAN ROADS (INTERIM) Arterial 140 ft Paved 2 12 ft 6 ft Paved 2 ft Gravel N/A Roadside Ditch or Storm Sewer N/A Collector 80 ft Paved 2 12 ft 5 ft Paved 1 ft Gravel N/A Roadside Ditch N/A Local 60 ft Paved 2 12 ft 1 ft Paved 1 ft Gravel N/A Roadside Ditch N/A URBAN ROADS (ULTIMATE) Arterial 140 ft Paved 4 12 ft 16 ft Paved* 16 ft to 28 ft Paved or Raised Median Curb & Gutter and Storm Sewer 10 ft Collector 80 ft Paved 2 12 ft 8 ft Paved* 0 ft to 16 ft Paved Curb & Gutter and Storm Sewer 5 ft Local •__I._J__ -. 60 ft ... Paved 2 12 ft 8 ft Paved* N/A Curb & Gutter and Storm Sewer 5 ft WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 18 Figure 24 Rural Local and Collector Roads (Unpaved) (Interim) INTERIM TYPICAL CROSS SECTION Typical Gravel Road NOT TO SCALE Notes: 1. 4 The allowable class and thickness of Aggregate Base Course (ABC) shall be deternned by the guidelines described in the Pavement Design Chapter. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated.. 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Width of ROW shall be determined by classification of road. 6. Signing per approved plan.. Computer File Information Cma6nn thte 02?1D/1U Ididals K1! WELD COUNTY PUBLIC WORKS DEPARTMENT tast.Maddrevian Date; Ih11e&rl6 Initials: ddd Full Patb, TIPBSOAdminTroposalsWeide thwiey Fit, Now Miemnutan Ver. XM. _ Sok N.T.S. Units•. English I l l r ll Srra Greeley, Col Pbanc (970 Fax: 1970; 3 4944673 Pages: 101 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kmma, Clerk and Recorder, Weld County , CO 11111 I rd14KiGWWII II 1 Rn'e5ed; INTERIM RURAL LOCAL AND COLLECTOR ROADS Dcsittlicr.wad courty F FIGURE NO. I I innenkamp WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Figure 2-2 Rural Local (Ultimate) NOT TO SCALE Computer File Information TYPICAL CROSS SECTION Notes: " The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC') shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shalt be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements.. 5. Signing and striping per approved plan. Coatis lace' 02110, I0 Igi�id.; K1I WELD COUNTY PUBLIC WORKS DEPARTMENT 01 lnaok; Kt1 tall Pule T:tPHS,Ad0t,riPcopmmlr'AVelde IYrtu,r Fik tiFmc tlirnaut,tm Ver. XSt Seale, N.T:S, l3nia: [.nrhsh RURAL LOCAL t.ipawchl(bounty FIGURE NO. 2 OM. K.. Hmnrnk,, 4944675 Pages: 102 of 285 02/15/2024 12:24 PM R Fee:$0,00 Carly Kopp.s, Clark and Reoorder, Weld County CO 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 110 Figure 2-3 Rural Collector (Paved) R0' l�.O.W. , 6' 22' 6' 24' 6' 22' — Buffer Shoulder: Varies 4' 12' ' 12' �-Shoulder 4' Be' i , Travel. Lane , Travel Lane *HMA % t 2% \1 —1,11; I 1 I I — 4`f (Class 5) * HMA — Compacted Subgrade 4 4 INTERIM TYPICAL 4 L _ * ABc (Class 6) — CROSS SECTION Shoulder(_ Multi -Use R0' RRO.W. 0' 20' 8' r rt 24' $' 20' Buffer . Varies tShoulder/ Multi -Use 6' 1 --*ShoulderJ i 12' 12' Multi -Use 6' Buffer _ - Travel Lane ' Travel Lanu *HMA i9 , uY'� ly I - I I Ila fir'=ut—uJ—l.l i—I lY 7 ABC � (Class, 5) — *HMA * ABC (Class `• p(L Compacted Subgrade4. —\ 6) — ULTIMATE TYPICAL CROSS SECTION NOT TO SCALE Note I, * The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter, 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4, Additional ROW may be required by Public Works to meet site specific requirements, 5. Signing and striping per approved plan. Computer File Information WELD COUNTY RURAL COLLECTOR CrxuionDan: 0211 W Initials:.. PUBLIC WORKS DEPARTMENT Last Modification Date: 01.+04`12 initials:.. Apprarcd: Full. Path TIPBSCAdminTropasalnAVOk t ri A lit 1 Fi Slnes+Foy4Dfle<e &+s 758 rxm34`Y• Cotarada g663.r67511 RnvKd: Drawing F& Name: i <, .r Pn ins (976) 364.649fi Dr IP' "''Inty FIGURE NO. 3 t x Innay;ba qg7 ,,,,,itanatn Ver \M Safe: MX,. Unit: Enelisli_y_: Rcsimt: Msmkr" K. Hinnrnkamp 4944675 Pages: 103 of 285 02/15/2024 12:24 PM R Fee:$0,00 Orly Kappa,, Clerk and Recorder, Weld County , CO 1 rdNIf'lNAi1451 IK:oll LAIN Il ML III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 11 Figure 2-4 Rural Arterial 140' �i.O.W. 40' in. 8' 24' 50' Buffer Varies Shoulder/ . 6' t 12' , 6' \Shoulder Travel Lane H1 Travel Lane 2% -* IMA2% 12' ABC ' f" Compacted Subgrade (Class • HMA — —• ABC (Class 6) INTERIM TYPICAL CROSS SECTION 4 22 B VV es 2 ButTer 84'-96 (,0' houlde (old -U 4' ed or Unpav00 SepthRoe 12' 12' I (2 vel Lane Travel Lane l' I l' el Lane 2% l *HMA a •'n ':.L! ♦ � 1' !P1 h .t _ T f 1"X'+A � dR #„� ".. � T err Shoulder/ Multi -Use 8' Buffer — ABC * HMA (Class 5) NOT TO SCALE • LIMA ' • ABC (Class 6) C"ompacted Subgntde ABC (Class 5) ULTIMATE TYPICAL CROSS SECTION Notes: I. • The allowable class and thickness of Hot Mix Asphalt (LIMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Puvernenl Design Chapter. 2. The foreslopea and backslopes shall be no steeper than 4:1 with a preference of 6: I or hatter where it can be accommodated. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site epceifie requirements. 5. Signing and striping per approved plan. Computer File Information CreatixDete 0,l0'l0 Lulel: KH WELD COUNTY PUBLIC WORKS DEPARTMENT IA, WO.. tMrr'. 0VD, 2 In6uR Ktl F,dlPad T_1 PBSC,AdminTre,,,WeWc tlra ift, t'11L �t3!!IC' 4944675 Pages: 104 of 285 02/15/2024 12:24 PM R Fee:$0,00 Carly Koppes, Clerk and Reoorder, Weld County , CO "Ill RURAL ARTERIAL tkrrpxl: Weld C'eunly th'rr:kn K. Ilrnnenkamp FIGURE NO, 4 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 112 Figure 2-5 County Highway 140' R.O 28' Buffer 10" Shoulder/ Multi -Use _ 12'' Travel: 8 2 2 16` Left Turn 1 24' v 10' 'travel Lane * FCC Travel Lane Shoulder/ Multi -Use 8' •l 11,1 ld n ID�Y1 n 11" —Sly R 11— Ills ll U 1-1"• lf"�Il,rll ,IE,;IIgr'7,"�, r„��II .,IGaalEl]�mll�b��EEr71�lE=n {tu.�nn- n��l_31 Ir...IF..,IE�'0 EI il�l<r—'_.1f-`I�;I : II�11„EIj,21„11 ,11,� NOT TO SCALE * ABC (Class 6) — clod Subgrade COUNTY HIGHWAY TYPICAL CROSS SECTION 28' Buffer Notes;_ 1. * The allowable class and thickness of Portland Cement Concrete (PCC) and Aggregate Base Course (ABC) shall be determined by the r�uut1delines described in the Pavement Design Chapter. 2. The foreslopes and bacicslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4. Adclitieesl ROW may be required by Public Harks to meet site specific requirements. 5. Signing and striping per approved plan. Computer File Information. 02110,20 Initiak KFl WELD COUNTY PUBLIC WORKS DEPARTMENT Las! Maclif,cadon Date: 01.12 lnitiils: KFI F{IQlPak TAPBSC4Admdt0PropcsalsWielde Drawing 1St Name: Micrcanuen yer. KM. Scale: N.T.S. Units: English Si [irnc9ey. Co l 4944675 Pagss: 105 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppea,Clerk and Recorder, Weld County , CO "Ill lewd: Revisal: Rn•ised: COUNTY HIGHWAY Ixs,Emer Svola cuunry I FIGURE NO. 5 Healer K.. Flinncnkamp WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE X13 Figure 2-6 Urban Local Compacted Subgrrde INTERIM TYPICAL CROSS SECTION f 60' 10' 10' Sidewalk/ Curb! Buffer Shoulder/ Multi•LJse II�X1�i�I ABC (Class 6) - 2' : l2' Travel Lane 1 Travel Lane • IIMA Compacted Subgradc ULTIMATE TYPICAL CROSS SECTION 5' Minimum Sidewalks as Required by Public Works NOT TO SCALE Computer File Information Cnalix Date. 0240.10 L as. Kti Sidewalk/ Curb/ Buffer Shouldeitr! Multt Notes: I • ' The allowable class and thickness of Hot Mix Asphalt (HIM) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The forestopcs and backstopes shall be no steeper than 4:I with a preference of 6:l or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4• Additional ROW may be required by Public Works to meet site specific requirements. 5. Signing and striping per approved plan. WELD COUNTY PUBLIC WORKS DEPARTMENT Ltm NUM,. fh4l 01'0,1.1.. InI0A Kt! t3dl PmA TATSCiXdmin=F'rotxtsateW,Ittc DMA, Fil Kane' 61nr+gmnn Ver. X111 k : N.T.S. I:nitr- kbgil'.h 1111 ti St ief Tt aiptnnal: Revita }tett. URBAN LOCAL ne .lordco�,1y t FIGURE NO. 6 tArkr K Hmtutkto, WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PACE X14 Figure 2-7 Urban Collector NOT TO SCALE INTERIM TYPICAL CROSS SECTION ompacted Subgradc ' ABC (Class ULTIMATE TYPICAL CROSS SECTION 5' Minimum Sidewalks as Required by Public Works Notes: I. * The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no 9lccper than 4:1 with a prcfcremcc of 6:1 or hatter where it can be accommodated. 3. All sideslopcs shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Signing and striping per approved plan. Computer File Information Cnativr Ate. 02.16KH I.uuSGtilni;a a+I}sir nI u; , In., Kit F.JIPa�-`r`.PBSC-AJmin-['rupt,.al,c�N'olJc WELD COUNTY PUBLIC WORKS DEPARTMENT Draa7va Ek Aimc' \licrdtatio ti's- XM & ` r S I niu F.nghsh 111 n snm r+»tO(tiu Bus 15s t irrrky. 4'oMrn1+ FgIb3:-u�t w 1:17 19141 kli-dd'.+Z Ap.d: Rnixd: Rnf. -J URBAN COLLECTOR r>a, cv tdc�lnly I FIGURE NO. 7 Ih ler. Ik. Hinucnkamp WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 115 Figure 2-8 Urban Arterial 140' R.O.W. r 40' _ 52' 24' 8' 52' .. Buffer _ Me s Shoulder8' 6' I 12' 12' Buffer . , Shoulder _ -Travel Lane', Travel Lane *HMA Tv, i 2n/ ` 4...,--.4.3.7 14?� ♦ \ (CloseB5) *.HMA— Compacted Subgrade —'1'ABC (Class 6) " ... INTERIM TYPICAL CROSS SECTION C 1 140'R 36. 16'-22' 16' 24' 16'-28' 24' y 16' 16'-22' - Sidewalk/ Curb/ Shoulder/ Multi -Use 12' 12' Raised Median I 12' 12' Shoulder/ Multi -Use Sidewalk/ Curb/ Buffer 10' Travel Lane Travel Lane ' ' t Travel Lane * HMA Travel Lane Buffer 1f' - - ■ a+.y v2rs-�+s��. V :a^�2r�_a.._�r : ...' •r 1-LL-It-11=11=fl= l -.Il IL IL 17=fl u -n a:•:a••� R Tr�rn B rr n n�f- n. >r_ir�n' � f! Ilolr it n=�r" —-t�1,-n�lr_n_rr n lr n=B n n n -n �_r` IT�u=rr_rl-n=71 n—Irnl _I . �,.......—.._.._.._ * ABC (Class 6) _.._.. ,..�.... n' ULTIMATE TYPICAL Compacted Subgrade CROSS SECTION 10' Minimum Sidewalks as Required by Public Works Notes: 1. * The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslapes and backslapes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public NOT TO SCALE Works to meet site specific requirements. 5. Signing and striping per approved plan. Computer File Information WELD COUNTY PUBLIC WORKS DEPARTMENT URBAN ARTERIAL Creation Data; 02/10110 Initials: KFr Last Modification Data 01/04/12 Initials:. _ " `1 I l I t Ii 8trcevPo,t 00iLo Qox 758 � �t,� Full Path T IPBSC�AdminTroposals\Wel. 1 r - yCukradu 86612-0758 1 Rly, : Dmion f k Name: DcsiBncr. t.Veld County I FIGURE PhonIe /976) JOS 6M14F pr Fax: 070).44497 Rniaat: hlicnnwlkm Ver. Xh'[ le: nits: ik English N.T.S_ Er NO. ii Detail.. K. Hirmenkamp WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE X16 CHAPTER 3 SURVEYING 3.1 SURVEY DATA - REQUIRE A SURVEY CONTROL SHEET The required horizontal datum for surveying in Weld County is North American Datum of 1983, NAD-83. The required vertical datum is North American Vertical Datum of 1988, NAVD-88. 3.2 STATE PLANE It is required that survey control be tied into a National Geodetic Survey (NGS) monument for state plane conversion. Please refer to the NGS website for monument information and location. 3.3 MONUMENT BOXES Monument boxes are available at no charge for surveyors with valid permits who are upgrading aliquot corners on paved Weld County Roads or placing monumentation for aliquot corners on new paved Weld County Roads. Please contact Public Works in advance at (970) 400-3750. 3.4 ROAD SAFETY Appropriate traffic control devices and safety equipment are required when surveying within the County right-of-way. For the safety of the traveling public, monument box covers must be replaced, or the holes created must be backfilled. To minimize damage to the asphalt, concrete collars will be required around newly installed monument boxes. 4944976 Pages: 109 of 285 02/15/2024 12:24 PM R Fe.:$0.00 Carly Kappa:, Clark and Recorder, Wald County , CO 111111 WELD COUNTY ENGINEERING 8z CONSTRUCTION CRITERIA PAGE '17 CHAPTER 4 ROADWAY DESIGN CRITERIA 4.1 GENERAL 4.1.1 Policy on the Use of Referenced Publications This chapter summarizes and/or supplements standards that have been prepared by AASHTO. The County expects and recommends that transportation designers reference the most recent edition of AASHTO's A Policy on Geometric Design of Highways and Streets as a primary guide when designing roadways in the County. Designers also are expected to reference CDOT design manuals. However, AASHTO and CDOT policies represent nationwide and statewide standards, respectively, which do not always satisfy County conditions. When standards differ, the instructions and guidance in this manual will govern. For the design of auxiliary turn lanes, please see Chapter 8 of this document. All traffic control devices and road striping will be in accordance with the latest version of the MUTCD or as shown in the latest version of CDOT's M&S Standard Plans. 4.1.2 Typical Plan Set Guidelines Typical plan sets should include enough detail and documentation to allow successful construction of the proposed transportation improvements. Plan sets found to be incomplete, or of insufficient quality to be easily readable by the reviewer(s), will be rejected by the Public Works Department. Plan sets will be produced on 11 -inch x 17 -inch paper and may be submitted electronically. All plan sets will be prepared by or under the direct supervision of a Professional Engineer licensed in the state of Colorado. Each sheet will be stamped and signed by the Professional Engineer of record. The following elements also must be included: Cover Sheet. Must include a vicinity map with scale and north arrow, an index of sheets, design data, the phone number and address of the company and/or engineer responsible for the drawings, a utility contact list with phone numbers and email addresses, the Utility Notification Center of Colorado (UNCC) phone number (811), the project title, and the date printed. M&S Standards Sheet. Must show which M&S standards from the most recent CDOT M&S Standard Plans are applicable to the project. Typical Section Sheet(s). Must include functional classification of the roadway, rural or urban classification of the roadway, right-of-way width, lane and shoulder widths, road centerline (crown) location, typical cross -slope, and pavement structural section elements and thicknesses. General Notes. Must include all notes that are applicable to the construction of the project. May also include notes on pavement design, Best Management Practice (BMP) design, etc. Summary of Approximate Quantities and Earthwork Quantities Sheet(s). Must include tables showing the bid tabulation quantities and breakdowns of all quantities by location. Survey Control Sheet(s). Must include the basis of elevation control, basis of bearings, and project coordinates datum. Right -of -Way Plan Sheet(s). Must be included when temporary or permanent easements are needed, or right-of-way will be acquired. Must include scale and north arrow, existing right-of- way lines, parcel lines and data, ownership information, proposed easement or right-of-way lines, and existing and proposed improvements. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 118 Utility Plans Sheet(s). Provide existing (SUE) and proposed utility relocations. Both plan sets must include scale and north arrow, utility ownerships, utility locations, utility conflicts. The SUE sheets shall provide the appropriate level of mapping meeting Colorado state legislative subsurface utility engineering (SUE) requirements. County requires Quality Level B or better for all utility impacts. The utility plan should also show the location of where utilities are proposed to relocate. Demolition and Removal Sheet(s). Must show existing conditions and include all items that are to be removed or demolished by the contractor as part of the project. Plan and Profile Sheet(s). Must include horizontal and vertical scales and north arrow, location of right-of-way, location of easements, location of property lines, location of utilities, centerline stationing, horizontal and vertical curve information, existing and finished road grades, and design elevations. Separate plan and profiles sheets will be included for each access point, irrigation structures, and other structures as applicable. Intersection Detail Sheet(s). Must include roadway centerline with stationing, north arrow, horizontal scale (1 inch = 20 feet preferred), proposed and existing contours (1 foot minimum), grade flow arrows, location of right-of-way, curb type label (if applicable), and critical spot elevations. Grading and Erosion Control Sheet(s). Must include existing and final elevation contours at a minimum one -foot contour interval, spot elevations at critical drainage points to facilitate review and construction, slope/flow arrows and labels, limits of construction disturbance, and location of permanent erosion control features. If the project requires a Stormwater Permit per the National Pollutant Discharge Elimination System (NPDES), a detailed stormwater management plan (SWMP) and landscaping/vegetation plan will be required. (Additional information can be found in Chapter 6 of this document.) Drainage Sheet(s). Must include location and type of all drainage features (e.g., pipes, ditches, inlets, manholes), details for pond spillways and outlet structures, plan and profile views of all pipes and culverts (unless new pipes or culverts are replacing existing ones of the same size and at the same location), location of all existing utilities, utility potholing, identification of utilities that conflict with new drainage features, and construction details. Labeling is required for any pond water surface elevations (WSEL), volumes, water quality capture volumes (WQCV), and elevations. Drainage sheets must correspond to the accepted drainage report. Signage and Striping Plan Sheet(s). Must include driving lane and shoulder widths; stationing locations for striping beginnings, endings, and changes; color and size of striping; striping material type; stationing location for signs; type and size of signs; and quantities tabulation tables. Landscaping Plan Sheet(s). Must include all areas that are to be seeded and/or landscaped. If trees are to be replaced, they must be shown on this plan subset. Phasing Plan Sheet(s). If the project is to be phased, the phasing plans must be included. Construction Traffic Control Plan Sheet(s). Must include plan view of all existing roads within the limits of the detour or within one mile of the project, whichever is larger; type and size of signs or other traffic control features; locations for all traffic control features; and quantities tabulation table. These sheets also must show any anticipated detour routes for road closures during construction. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (19 Cross Section Sheet(s). Cross sections on 50 -foot interval must include depiction of existing and final ground elevations, location of existing and proposed right-of-way and easement lines, utilities, station labeling, and roadway centerline location. Stormwater Management Plan. Must determine whether site is located in a Municipal Separate Storm Sewer System (MS4) area and must be included for temporary and permanent control measures. See Chapter 6 of this document for more information. These guidelines are not intended to replace specific guidelines related to preparation and submission of plat maps and property description maps prepared by a licensed professional surveyor. These guidelines also are not inclusive of all the specific items that may be required by the Weld County Public Works, Planning or Building Departments. There may be additional requirements for more complex projects, such as bridge replacement and County Highway projects. Table 4-1 below summarizes the roadway design criteria that can be found in this document for each roadway classification. For additional details refer to the sections below that discuss each topic. 4944675 Pages: 112 of 285 02/15/2024 12:24 PM R Fee:$0.00. Carly Koppel, Clerk and Reoorder, Weld County , CO 111 VA!Ki�K��l WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 120 Table 4-1 Roadway Design Criteria Design Element Arterial I Collector I Local Design Speed Within Subdivisions 60 mph 1 50 mph I 40 mph Outside Subdivisions See Note 1 Posted Speed Within Subdivisions 50 mph I 40 mph I 30 mph Outside Subdivisions See Note 1 Design Vehicle WB-67 I WB-67 I WB-67 Maximum Superelevation Rural 6% 6% 6% Urban 4% 4% 4% Minimum Tangent Between Curves in Addition to Superelevation Transition Length Required 100 ft 100 ft 50 ft Minimum Intersection Tangent (Measured from Pavement Edge) (See Note 2) 200 ft 150 ft 100 ft Minimum Centerline Radius See Note 3 Minimum K Value for Vertical Curves See Note 4 Minimum Stopping Sight Distance See Note 4 Minimum Centerline Grade on Road with Curb and Gutter 0.40% 0.40% 0.40% Maximum Centerline Grade 5% 6% 8% Maximum Vertical Grade Change Not Requiring a Vertical Curve ≤0.2% ≤0.2% ≤0.2% Minimum length for Vertical Curves Preferred: 300 ft 300 ft 300 ft Allowed (3 x Design Speed): 180 ft 150 ft 120 ft Notes: 1. See Section 4.1.3 to determine an appropriate design speed and posted speed limit. Enforceable speed limit for roads without a posted speed limit is 55 mph. 2. See Figure 4-2. 3. See AASHTO's A Policy on Geometric Design of Highways and Streets superelevation tables for minimum radii based on design speed and maximum superelevation. 4. See Table 4-2 for minimum stopping sight distance and K values for vertical curves. 4.1.3 Design Speed Weld County requires designers to use a design speed that is 10 miles per hour (mph) above the required posted speed limit. Any change to the existing posted speed limit on a County road requires review by the Public Works Department and approval by the BOCC. To determine an appropriate speed limit, traffic investigations should consider the following factors applicable to the portion of road being studied: • Vehicle speed data (85th percentile) • Crash history • Hazardous locations (curves, sight distance, etc.) • Parking practices WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 121 • Roadside development • Road characteristics The enforceable speed limit on roads within the County (not including roads within a subdivision) is 55 mph unless posted otherwise or within business districts, residential areas, or other areas where special conditions require a lower speed limit. Section 42-4-1102 of the Colorado Revised Statutes requires that speed limits not be higher or lower than the basic prima facie (reasonable and prudent under normal conditions) speed limit unless a traffic investigation has justified the change. Posted speed limits for roads within subdivisions shall be as follows: • 50 mph for arterial roads; • 40 mph for collector roads; • 30-40 mph for local commercial/industrial uses; and • 25 — 30 mph for local residential uses. 4.2 HORIZONTAL ALIGNMENT 4.2.1 Horizontal Curves Horizontal alignment of the roadway is critical for safe and economical operation of motor vehicles traveling the roadway at the design speed. Horizontal curve design should be based on an appropriate relationship between design speed, right-of-way, profile grades, and construction costs —and on their joint relationships with superelevation and side friction. Curves are not required when the deflection angle (A) (total central angle of the circular curve) is less than 1 degree. Curves should be at least 500 feet long for a deflection angle of 5 degrees, and the minimum length should be increased 100 feet for each 1 degree increase in the deflection angle. Figure 4-1 illustrates a simple horizontal curve. aFigure 4-1 Horizontal Curve 31%= = � Z O�L • NLL O�� ifriE N a The formulas can be found in AASHTO's A Policy on Geometric Design of Highways and Streets and • g%". CDOT's M&S Standard Plans. Minimum radius values may also be taken from the AASHTO superelevation tables, using the "NC" (normal crown) line item. For rural areas, use the AASHTO table :Wiwi for minimum radii normal crown rates with eR,a, = 6 percent. For urban areas, use the AASHTO table for minimum radii for normal crown rates with emax = 4 percent. 4944675 Pages: 114 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopp•, Clerk and Recorder, Weld County , CO IIIII MOM ighatrilgrAINAri�'K� 41 h�ti Simple Curve WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 122 Designers should use every effort to exceed the minimum curve radius recommended by AASHTO when practical. Simple curves should be used for all roadways. Broken back, compound, or reverse curves are not recommended. The tangent between curves should be sufficient to accomplish the superelevation transitions required for adjacent curves. An additional 50 feet to 100 feet of tangent length, graded as a normal crown, should be provided between the end of the transition out of one curve and the beginning transition into the next for ease of driving. Minimum intersection tangents (measured from the pavement edge of the intersected road at intersections) shall be as follows: 200 feet for arterial roadways; 150 feet for collector roadways; and 100 feet for local roadways as illustrated in Figure 4-2. Figure 4-2 Minimum Tangent from Intersection MINIMUM TANGENT FROM INTERSECTION WELD COUNTY ROAD EDGE OF PAVEMENT POINT OF CURVATURE (PC) 4.2.2 Superelevation • 2 Proper design of horizontal curves often requires the use of superelevation (roadway banking). Factors 8 controlling the use of superelevation include climate conditions, terrain conditions, classification of the -- road, and the frequency of slow -moving vehicles on the roadway. In general, a lower rate of superelevation is used in urban areas than in rural areas. For rural areas, use the AASHTO table for Yminimum radii for design superelevation rates with emaX = 6 percent. For urban areas, use the AASHTO aa,i3 table for minimum radii for design superelevation rates with emaX = 4percent. If possible, superelevation Na3 g P p rates of 4 percent or less should be used in roadway designs. E" f— 4.2.3 Transitions : � �g The superelevation transition section consists of the superelevation runoff and tangent runout sections. ola'-Z The superelevation runoff is the length of roadway needed to accomplish a change in outside lane cross slope from zero to full superelevation, or vice versa. The tangent runout section is the length of roadway needed to accomplish a change in outside lane cross slope from normal cross slope rate to zero, or vice aao a versa. Additional information pertaining to the lengths and use of transitions for simple and spiral curves can be found in AASHTO's A Policy on Geometric Design of Highways and Streets and CDOT's M&S Standard Plans. The design should allow for 60 percent of the superelevation transition length to occur before the horizontal curve starts and after it ends. The remaining 40 percent of the transition occurs within the horizontal curve. This includes the lengths for all the transitions including normal crown, level crown, reverse crown and full superelevation. 4944675 Pages: 115 of 285 02/10/2024 12:24 PM R Faa:$0.00 Carly Kopp., Clark and Racordar, Wald County , CO Mk I MAIM, III II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (23 4.2.4 Cross Slope Cross slope is necessary to ensure adequate roadway drainage. The paved typical cross sections (described in Chapter 2 of this document) all show a cross slope of 2 percent, and this is the County's preferred value for a paved roadway. Non -paved roadways should have a cross slope closer to 3 to 4 percent to help accommodate surface drainage. Undivided roads should have a normal crown that is a two-way cross slope, with the high point of the cross section located on the road centerline. Divided roads should have a cross slope on each side of the divide, with the high point of each section located - where the pavement meets the median. • Unusual conditions and transition areas may cause the 2 -percent cross slope requirement to vary. Cross og slopes varying from a minimum of 1 percent to a maximum of 4 percent may be allowed depending "� upon surface type. Intersections of roads with curbs and gutters sometimes require the use of crosspans for drainage. At these areas, the normal two-way 2 -percent cross slope will transition to a one-way slope adjacent to the cross pan, with a slope range of 1 percent to 3 percent. For intersections not Nm requiring cross pans, see Figure 4-3 for the desired cross slope configuration. aMii 4.2ff' o; •ate nli It iftla (Diva Nm a� Figure 4-3 Intersection Cross Slope Detail UNCONTROLLED INTERSECTION Maintain positive drainage from centerpoint of intersection CONTROLLED to all quadrants. INTERSECTION Eliminate crown from all directions approaching the intersection. Through road retains crown; side roads with stop/yield signs are shaped to match the edge of through road. The rate of change for cross slope in an area of transition, should not exceed 1.5 inches over a 50 -foot horizontal distance. This rate helps to ensure ride quality for the traveling public. • 4.3 VERTICAL ALIGNMENT X Weld County's topography generally is flat with gentle slopes, but some areas have steep drainage ▪ basins and rolling hills. When designing roadway vertical alignment, designers must consider stopping sight distance requirements for the given speed limit and the challenges of large cut -and -fill sections. Nm3TZ Vertical curves are classified as either sag or crest curves. Typically, sag curves are controlled by nighttime driving conditions with headlight visibility restrictions, and crest curves are controlled by (41 3.1 stopping sight distances. Vertical curves should be simple in application and should result in a design ��y that is safe and comfortable in operation, aesthetically pleasing, and adequate for drainage —especially �a ro when a curb and gutter are used. 4.3.1 Maximum and Minimum Grades Grade lines typically are controlled by topography and structure clearances, but very flat grade can be o controlled by drainage considerations. Other factors that should be considered are road classifications, ;I.!! a design speed, safety, and construction costs. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 124 A minimum grade value of 0.4 percent is preferred for road sections with curbs and gutters. In certain conditions, a grade as low as 0.3 percent may be used with approval of the Department of Public Works. The designer must consider the ultimate design of the roadway, however, recognizing if a curb and gutter may be required in the future, and then design for those conditions during the interim design. Maximum allowable grades are as identified in Table 4-1 above; 5 percent on arterials, 6 percent on collectors, and 8 percent on local roads. Grades of 4 percent or steeper will require special consideration for drainage or erosion protection. When using combinations of horizontal and vertical curves, it is important to recognize the driver's 2 perspective. Sharp horizontal curvature should not be introduced at or near the top of a pronounced crest vertical curve. If unavoidable, the horizontal curve should be made longer than the vertical curve to help minimize the driver's inability to perceive the horizontal change, especially at night. For further details, see AASHTO's A Policy on Geometric Design of Highways and Streets and CDOT's Roadway Design Guide. N�3Y The length of vertical curves can be determined by dividing the rate of vertical curvature by the grade change or algebraic difference in intersecting grades (%). L (Length)(ft) = K (rate of curvature) / A (grade change)(%) 1E -ME a A vertical curve is not required when a grade change or the algebraic difference is ≤ 0.2 percent. The :; Weld County preferred minimum length of a vertical curve is 300 feet. The allowed minimum is three times the roadway design speed. �aa 4.4 SIGHT DISTANCE At intersections, accesses, and points along County roadways, sight distance is essential to protect the traveling public. In evaluating the overall performance of a roadway, there are several sight distances to consider when designing a roadway. When items such as walls, buildings, bridge piers, cut slopes, or vegetation growth are near the roadway on the inside of a curve, they can block a driver's view of the road ahead. If they are too close, the driver will not have sufficient distance along the curved roadway to stop when a hazardous condition comes into view. Sight distance related to accesses is discussed in Chapter 8 of this document. 4.4.1 Stopping Sight Distance Stopping sight distance is the length of roadway it takes for a driver to bring a vehicle to a complete in 7:7 stop. Stopping sight distance is measured from the driver's point of view, which, according to AASHTO's Nm3� A Policy on Geometric Design of Highways and Streets, is 3.5 feet above the road surface, to an object's m _ o`�' height of 2 feet within the roadway. Stopping sight distance includes the reaction time of the driver and �LL X braking distance of the vehicle, as well as roadway grades (see Table 4-2). Additional information regarding reaction time and braking distance can be found in AASHTO's A Policy on Geometric Design of a1a S -T Highways and Streets and in Chapter 8 of this document. 'N�' As shown in Table 4-2, stopping sight distance varies depending on the percent in grade up or down NU� within the vertical curve. The designer should account for the varying grades within his or her profile igN E . design and select the appropriate values of stopping sight distance. Table 4-2 lists stopping and passing sight distances for various percent grades up or down. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 125 Table 4-2 Stopping and Passing Sight Distances and K Values Design Speed (mph) Stopping Sight Distance (feet) Passing Sight Distance No Grade % Down Grade % Up Grade Crest Sag Crest Curve (0) 3 6 9 3 6 9 K K (feet) K 25 155 158 165 173 147 143 140 12 26 450 72 30 200 205 215 227 200 184 179 19 37 500 89 35 250 257 271 287 237 229 222 29 49 550 108 40 305 315 333 354 289 278 269 44 64 600 129 45 360 378 400 427 344 331 320 61 79 700 175 50 425 446 474 507 405 388 375 84 96 800 229 55 495 520 553 593 469 450 433 114 115 900 289 60 570 598 638 686 538 515 495 151 136 1,000 357 65 645 682 728 785 612 584 561 193 157 1,100 432 For horizontal curves (see Figure 4-4), the sight line is measured along the chord of the curve, while the stopping sight distance is measured along the centerline of the inside lane around the curve. Figure 4-4 Horizontal Sight Distance Sight Distance Sight Obstruction HSO = R(1 -cos (28.65S/R)) or S = R/28.65 acos ((R-HS0)/R) 050 = Horizontal Sightine Offset S - stopping Sight Distance R. Radius of lane centerline Horizontal sight distance may be restricted by obstacles along the roadway or even by cut slopes through a hillside. Other normal roadside objects, such as guardrail, concrete barriers, and privacy fences, should be studied for interference with sight distance. 4844675 Pages: 118 of 285 02/15/2024 12:24 PM R Foe:$0.00 Carly Keypa., Clark and Recorder, Weld County , CO 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 126 Vertical sight distance is determined by the geometrics of the curve. Figure 4-5 is an example of the crest vertical curve. Figure 4-5 Crest Vertical Curve Sag vertical curves usually are controlled by headlight distance. Under certain conditions, the minimum stopping sight distance values used for design exceed the length of visible roadway. This is because of the limitations of vehicle headlights, especially low -beam headlights. Formulas to determine stopping sight distance on both crest and sag curves can be found in AASHTO's A Policy on Geometric Design of Highways and Streets. 4.4.2 Passing Sight Distance Passing sight distance is the length of roadway required for the driver of a vehicle to pass another vehicle safely and comfortably, without interfering with the speed of an oncoming vehicle traveling at the design speed if it came into view after the passing maneuver was started. Passing sight distance is measured from the driver's point of view, which is to be measured at 3.5 feet above the road surface, to an object's height of 3.5 feet. Typically, passing sight distance will be limited on crest vertical hills. A significant amount of cut may be required to achieve adequate passing sight distance. Table 4-2 lists appropriate passing sight distances for various speeds. 4.4.3 Decision Sight Distance The stopping sight distances shown in Table 4-2 are distances for reasonable and alert drivers to come to a complete stop. They do not include the time it takes drivers to make a decision when unexpected or unusual maneuvers are required. Decision sight distances (see Table 4-3) are substantially greater than stopping sight distances. Locations where these kinds of decisions are required include interchanges, cluttered or confusing intersections, and short lane drops. (See AASHTO A Policy on Geometric Design of Highways and Streets for more information.) 4944878 Psges: 119 of 285 02/15/2024 12:24 PM R Fee:50.00 Carly Kopp., Clerk and Recorder, Weld County , CO 110 141,11 414V ?' 111111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 127 Table 4-3 Decision Sight Distance Decision Sight Distance Design Speed (mph) Decision Sight Distance for Avoidance Maneuver (ft) A B C D E 30 or less 220 490 450 535 620 40 330 690 600 715 825 50 465 910 750 890 1,030 60 610 1,150 990 1,125 1,280 70 780 1,410 1,105 1,275 1,445 Where: Avoidance Maneuver A = stop on rural road (t = 3.0 seconds) Avoidance Maneuver B = stop on urban road (t = 9.1 seconds) Avoidance Maneuver C = speed/path/direction change on rural road (t =10.2 sec to 11.2 sec) Avoidance Maneuver D = speed/path/direction change on suburban road (t =12.1 sec to 12.9 sec) Avoidance Maneuver E = speed/path/direction change on urban road (t =14.0 sec to 14.5 sec) 4.4.4 Intersection Sight Distance There are numerous intersections within Weld County; most are controlled, but some are uncontrolled, which means there is no signing in either direction. Ideally, intersections would have adequate sight distance in all directions and along approaches to allow drivers to see obstructions or approaching vehicles. However, many of the County intersections do not have unobstructed views for various reasons. Utility appurtenances, embankments, vegetation, and privacy fences are just a few examples of sight restrictions. In these circumstances, and where no traffic control devices are present, the basic rule of the road is the vehicle on the left is to yield to the vehicle on the right if they arrive at about the same time. If drivers cannot see due to sight obstructions at the intersection, it is the responsibility of every driver to slow down and determine if it is safe to continue through the intersection. Additional information regarding intersection sight distance can be found in AASHTO's A Policy on Geometric Design of Highways and Streets. The recommended dimensions of the sight triangles vary with the type of control used at the intersection because different types of control impose different constraints on drivers and, therefore, result in different behavior. AASHTO's A Policy on Geometric Design of Highways and Streets presents procedures to determined sight distances at intersections for the following types of traffic control: 1. Intersections with no control 2. Intersections with stop control on the minor road 3. Intersections with yield control on the minor road 4. Intersections with traffic signal control 5. Intersections with all -way stop control 6. Left turns from the major road 7. Roundabouts Figure 4-6 below, illustrates an intersection with stop control on the minor road. For information regarding the variable definitions and equations used to calculate these distances, see Section 8.6.2 of this document and AASHTO's A Policy on Geometric Design of Highways and Streets. 4944873 Pages: 120 of 285 02/10/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clark and Raoordar, Weld County , Co IIIII FA" Prilili,illnligillyr.Ilk lAtilit UDC Ilk Bill WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 128 Figure 4-6 Departure Sight Triangles at Intersection (Stop Control) La _ Clear Sight Triangle Decision Point Major Road a#i o Major Road 82 La b a~ Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic Departure Sight Triangle for Viewing Traffic Approaching the Minor Road from the Left Approaching the Minor Road from the Right Private accesses need to take into consideration these sight distance requirements just as other roadways would. More information regarding access sight distance can be found in Chapter 8 of this document. 4.5 INTERSECTIONS By definition, an intersection is the location where two or more roadways meet or join together. This occurs at at -grade crossings, interchanges, or grade separations without ramps. All of the County -owned intersections in Weld County are at -grade intersections. Generally, there is more potential for conflict at intersections than on straight sections of roadway, so intersections usually have higher accident rates. Chapter 9 of AASHTO's A Policy on Geometric Design of Highways and Streets discusses intersections and provides guidance on design details. Designers also should refer to CDOT's Roadway Design Guide. The sections below highlight a few key aspects of intersection design. See also Chapter 2 of this document for typical cross-section drawings. 4.5.1 Alignment and Profile It is very important for the success and safety of any intersection that it is aligned with the intersecting roadway. For standard, at -grade, four-way intersections and T -intersections, the roadways should meet as close to perpendicular as possible. Skewed intersections are difficult for drivers and create unsafe conditions. The required angle between centerlines of the intersecting roadways is 90 degrees, as shown in Figure 4-7. Any deviations from 90 degrees will need to be approved by the Department of Public Works. 4944675 Pages: 121 of 285 02/15/2024 12:24 PM R F..:$0.00 lit y Kopp., Clerk and Recorder, Wald County , CO I ��Id111 Y r�rh4wl�'d�4�1'M�wIaI�i�,��liJti'�lI�'I IY�h �� II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PACE 129 Figure 4-7 Typical Intersections 90 Degrees Rdwy CL I � J r 9OD glees T 1 `. 90 Degrees l N. �/ Rdwy CL Four -Way Intersection T Intersection The alignments and grades of the intersecting roadways should permit the maneuvers needed for cars to pass through the intersection with minimal interference. Alignments should be as straight and flat as practical, and substantial grade changes should be avoided. All lanes shall be in general alignment through each intersection; however, a maximum 2 -foot shift is allowed across an intersection without a variance approval by the County Engineer. The profile grade lines should be adjusted back a distance from the intersection to provide a smooth transition. It may be desirable to remove the cross slopes coming into the intersection, as steep cross slopes or grade changes create an undesirable bump at the intersection and may require reconstruction to correct. Refer back to Figure 4-3 for an intersection cross slope detail. A smooth transition is particularly important at intersections where drivers do not reduce their speed or come to a stop. Designers should remember that intersections which are currently stop -controlled may not be stop - controlled in the future. 4.5.2 Corner Radii Corner radii are another critical aspect of intersection design. Corner radii are selected based on the turning radii of different design vehicles. Chapter 2 of AASHTO's A Policy on Geometric Design of Highways and Streets discusses design vehicles and their different turning radii. The four classes of design vehicles are: passenger cars, buses, trucks, and recreational vehicles. The Weld County design vehicle is the WB-67 truck. 4.5.3 Approval Requirements Chapter 9 of AASHTO's A Policy on Geometric Design of Highways and Streets summarizes the minimum edge of traveled way design for the four classes of design vehicles. Usually, the simplest curves to construct are the simple curve with taper and the three -centered compound (symmetric) radii. Other compound curves can be difficult to implement in the field. For intersections on arterial and collector roadways, designers should consider a minimum radius of 65 feet, following a simple curve with taper WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 130 radii. This allows larger trucks to make right turns without the rear tires going off the road and without veering into opposing vehicle paths. An exhibit from AutoTURN software or equivalent roadway design turning template software must be provided to the County to demonstrate the corner radius is appropriate. 4.5.4 Auxiliary Lanes See Chapter 8 of this document for information on auxiliary lanes. 4.6 CUL-DE-SACS Cul-de-sacs and dead-end roadways are not common in the County but are sometimes found in subdivision and residential areas. Cul-de-sacs should be designed with a radius large enough to allow a standard fire truck to use the cul-de-sac to make a u -turn without having to back up. The minimum outside curb or pavement edge radius allowed for a cul-de-sac is 55 feet. The minimum right-of-way turnaround radius is 65 feet. The maximum cul-de-sac length between intersecting streets (from centerline to centerline) is 1,500 feet. No more than 20 lots may be served by a permanent cul-de-sac. The most common design is a circular cul-de-sac with or without a center island. Chapter 5 of A Policy on Geometric Design of Highways and Streets offers additional design criteria and other types of cul-de- sacs. The designer must consult the relevant fire protection authority for its minimum criteria as well. 4.7 BRIDGES This section is not intended to cover bridge design in detail. It covers only general guidelines. More detailed bridge design information can be found in the latest editions of AASHTO's LRFD Bridge Design Specifications, the Culverts and Bridges chapter in the USDCM, Volume 2, and CDOT's Drainage Design Manual and Bridge Design Manual, as updated. 4.7.1 Bridge Hydraulic Capacity During preliminary design, the designer shall complete a hydrologic and hydraulic analysis of the waterway to correctly size the opening of a new bridge, coordinating with owners as necessary. Bridges over canals require less hydrologic analysis than bridges over natural drainage ways. Designers shall gather and analyze background information, such as past inspection reports, measurable high-water marks, past maintenance issues, scour, and flood records. The storm design frequency for the different types of roadways and drainage types is shown in Table 4-4. 4944675 Pages: 123 of 285 02/15/2024 12:24 PM R Fs.:$0.00 Carly Koppas, Clark and Raoordar, Wald County , CO kibiliniliriliskNiNiLrill*I6 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 131 Table 4-4 Design Frequencies Drainage Type I Design Frequency Multi -Lane Roads Urban area 100 -year Rural area 100 -year Two -Lane Roads Urban area 100 -year Rural area C150> 4000 cfs Qso < 4000 cfs 50 -year 25 -year Drainage Type Design Frequency Bridge foundation scour Based on Qdeslgn if: Qzs requires Qso scour design and Qioo Check Flood Qso requires Q1oo scour design and Qzoo Check Flood Q1oo requires Qzoo scour design and Qsoo Check Flood In areas that contain the FEMA mapped 100 -year floodplain, designers shall use the 100 -year discharge in their designs. If a bridge is being constructed in a 100 -year floodplain, all applicable floodplain regulations and codes apply, including the need to submit a Letter of Map Revision (LOMB) to FEMA for review and acceptance and the need to obtain a Floodplain Hazard Permit from the County. On wide floodplains, structure loss can be prevented by lowering approach embankments to provide overflow sections that pass unusual floods over the roadway. This may require relief structures to be constructed to allow minor flooding without upstream ponding. Factors such as traffic delays and alternative routes should be considered. Additional and detailed information can be found in CDOT's Drainage Design Manual and CDOT's Bridge - Design Manual. ▪ 4.7.2 Freeboard ; A minimum clearance, or freeboard, shall be provided between the water surface elevation and the low a girder of the bridge. The freeboard is required to allow for wave action, ice, debris, and uncertainty during estimation. Nm3 y The minimum freeboard for a bridge should follow these guidelines: t% -fa.:• For a high -debris stream, freeboard should be 4 feet or more. A "high -debris" stream ;11' (St designation often will be site -specific and shall be determined through consultation with Public Works officials and local landowners, as well as through a thorough investigation of the debris potential in the watershed. • For low- to moderate -debris streams, the minimum freeboard will be 2 feet. Nil The water surface elevation at a distance of 50 feet to 100 feet upstream of the face of the bridge will V-11.:. be the elevation to which the freeboard is added to get the low girder elevation of the bridge as a rough gj2aestimate of maximum backwater. tTmv� WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 132 4.7.3 Bridge Scour Increased flow velocities at bridge constrictions often lead to scour of the bridge foundations, which can cause the potential for collapse of the structure. Localized bridge scour is comprised of contraction scour and local scour at piers and abutments. These three components are added together to create the final scour envelope. Methodologies for estimating scour at bridges can be found in the following FHWA guidelines: • FHWA, Evaluating Scour at Bridges, Hydraulic Engineering Circular No. 18 (HEC-18), latest edition • FHWA, Stream Stability at Highway Structures, Hydraulic Engineering Circular No. 20 (HEC-20), latest edition Methodologies for designing scour countermeasures at bridges, piers, and abutments can be found in FHWA's Bridge Scour and Stream Instability Countermeasures: Experience, Selection, and Design Guidance, Hydraulic Engineering Circular No. 23 (HEC-23), latest edition. 4.7.4 Use of HEC-RAS It is acceptable to use the U.S. Army Corps of Engineers (USACE) Hydrologic Engineering Center's River Analysis System (HEC-RAS) to determine the hydraulic characteristics at bridges. Standard modeling practices accepted by FEMA should be used when performing HEC-RAS modeling. It is not acceptable to rely on HEC-RAS output for estimating maximum velocities for erosive or hazardous considerations or local scour in a channel. A more -detailed hydraulic analysis of the specific cross section, accounting for variable velocities across the channel, is necessary. - 4.7.5 Bridge Railing 0 2 Bridge railing should be provided along bridge edges to protect both drivers and in applicable situations _ pedestrians. Weld County follows CDOT M&S Standards for bridge rail and guardrail design. CDOT's "� M&S Standard Plans, as well as the CDOT Bridge Structural Worksheets, identify several different railing aN options and configurations that the designer may consider. AASHTO's bridge design documents provide 5a additional information as well. Nm3 4.7.6 Minimum Structural Requirements o day Design loadings for bridges shall comply with the latest editions of AASHTO's LRFD Bridge Design V.I? X Specifications and CDOT's bridge design publications. 494487"5 Pages: 125 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Coops., Clark and Raoordar, Weld County , CO IIIII 111k�M1,11 ICakihli# III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 133 CHAPTER 5 DRAINAGE CRITERIA 5.1 GENERAL The intent of Weld County's storm drainage criteria WCECC is to protect the health, safety, general welfare, and economic well-being of the County and residents, while also protecting property and infrastructure. The drainage characteristics of Weld County vary greatly throughout the 4,000 square miles of the county. This chapter aims to provide greater detail on the expectations and guidance for drainage -related portions of a project. Weld County has adopted the following master drainage plans: South 1-25 Corridor Master Drainage Plan, also known as "Godding Hollow and Tri-Town Study" (adopted in 1999). The South 1-25 "Tri-Town" Master Drainage Plan from 1999 can be found on the City of Dacono's website. Master Drainage Plan for the Area Surrounding Weld County Parkway (adopted in 2016). This Master Drainage Plan can be found on the County's Parkway webpage. A map of Weld County's drainage basins is shown in Figure 5-1. A full-sized version is provided in Appendix A. This manual refers to both the current and older, archived versions of Urban Drainage and Flood Control District (UDFCD) Urban Storm Drainage Criteria Manual (USDCM), Volumes 1 through 3. This manual will explicitly state when to use an older version of the USDCM. UDFCD has rebranded as of 2019 and is now referred to as the Mile High Flood District (MHFD). The MHFD acronym will be used exclusively throughout the chapter. It shall be noted that specifically to drainage, some of these references have provided updated values and equations in recent years that are in accordance with Full Spectrum detention pond design. Weld County does not support Full Spectrum design and, as such, when standards differ, the instructions and guidance in the following Drainage Chapter will govern. All Storm Drainage Guidance documents provided by the County can be found on the Weld County Planning and Zoning's Development Review webpage. 4944873 Pa►gss: 126 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppaa, Clark and Recorder, Wald County , CO II111MOM ' INI nifilliVftliliA1,114.10, BIM WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 134 Figure 5-1 Weld County Watersheds 'a. o minZ o a mEs o - U ![I N0• 41, oL o cr • g ce 73 a el Y rl • t -- --a r r-+ 7O11 (- e-4 j_ Jim ulC CZ a- No -4i r'et ' g N � a rteG a •. N Oi • C!'oo 4 •. •1 t, ty 21 23 n 3I .1 .. T .�� aSager -f 11t..-.- -OP sit ‘*;\ A a "I . ' - , . • -, 1. t . ne i On relIe ,,.A . •- —i...... 1 i- Y. . I E .., �.•,,,,,4 L.j:i_ck771T4 - — ,_•'.ft_L�t 1i-sw.w r • �F• 4,r -t lafw •r• i II 1 ; ger • . N te • - Weld County '� '� '�'�■ . , - F! _ -a , Drainage bas Map . , • �. J� • 1 Nu•• I. UMWI•___ I4141 C ow" Oktilsit Was Ent 4 .� ■ - , 4 Mw ti t1,. ■�st Sloriesob IV ... 4i .., I , s vitist,,,, r . .,. t �Y --� h v I bra lnag• exam Daulxl••IR• ilme Sam Or - Me 114 4.4 ;j:fJ .• D le taw ' N ar 1 K .-is . - Sr , . . ,t E i Mill sosSlispo. ,, so Ir. II Litt • r. 1, ir rt • t 4 Ji" 1".1:4-irt.T. 41 a . a _ _ _ I lea ism .; et-, mucam Oa vn ■ en t l! R tam a tea ' _Lat . -- • f�� -' . .,�... - i • - '►« ..nom., . '• +h-+ «--+� -. • •.•4_ t F ~r S�.. ; �, ��... r vow awns .••••• T .0--1.1� M f�• „ —z eitN-tro 40a�•.w�1ari;t• r.—. s•w• Mi.IM A•w 71 a^casflac- ' 20 M M•Saine is r.teary tt—woos* lido ea *SKI; 5.2 DRAINAGE LAW L7 It; ,« tY• Is • ,U 4- r .. fl I p• T P tM 0 tI♦ Refer to the Drainage Law chapter of the USDCM, Volume 1, for more information on drainage law as it relates to stormwater runoff and floodplain management 5.3 DRAINAGE POLICY The drainage policies set forth are intended to provide adequate stormwater management to preserve and promote the health, safety, general welfare, and economic well-being of the County. Weld County embraces the basic principles defined in the Drainage Policy chapter of the USDCM, Volume 1. 5.3.1 Submittal Requirements The Weld County Planning Services Department is the agency responsible for reviewing drainage in the development review process. The submittal requirements for each project (commercial and residential WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 35 developments, new roadways, new bridges, channel restorations, etc.) will differ based on the scope and location of the improvements. °11-7 11- inch x 17 -inch paper. 4 The Drainage Report Checklist provided in Appendix B shall serve as a guideline for designers throughout the entire design and construction process. The Drainage Report Checklist provides a framework of Weld County's requirements for the drainage report, construction drawings, and operations and maintenance (O&M) plan. The designer shall include this checklist with the preliminary and final 2 deliverables for the project. ox The drainage report must fully document all assumptions and methodologies and shall contain copies of all applicable tables and reference materials in an appendix. A drainage basin map shall be included showing basin delineations, flow arrows, design points, pond volumes, and any other information pertinent to the design. Grading and drainage plans shall be submitted as a single PDF document, printable to scale on �LL t To assist owners with maintenance, an Operations and Maintenance (O&M) plan for stormwater -- facilities and associated infrastructure shall be included with the final drainage report. The O&M as 5=1 plan should include instructions on safe and correct operations, repair and maintenance of all installed equipment and facilities, and recommended inspection schedules. The O&M plan to be distributed to any applicable homeowners' association or business park association (or 21166 equivalent). Weld County has adopted CDOT's guidelines for the O&M plan and is provided in rCk-Appendix C. � Electronic copies of drainage design spreadsheets, models, etc., may be requested for submittal to Weld County for reviewing purposes. AutoCAD base files (including site layout, roadways, utilities, survey coordinate system information) shall be included with the project's final submittal for inclusion into the County's GIS mapping system. Electronic pdf copies of all calculations relevant to the design of the project shall be included in the drainage report appendices for review. Each plan and report must be prepared by or under the supervision of a professional civil engineer licensed to practice in the State of Colorado. Plan sheets will contain the Engineer's seal; signed, dated, and sealed per State requirements. Electronic stamps are acceptable. g The report shall contain the Weld County Drainage Code Certificate of Compliance stating that U 2-�- the design meets all applicable drainage requirements set forth in this WCECC, with the N3 exception of County -approved variances. The Certificate of Compliance is available on the `6%77-2-i Department of Planning and Zoning's Development Review webpage. Design variance request �LL information is to be included on the lower portion of the Certification of Compliance sheet. The consulting engineer should provide information supporting the variance request in the form of a oN►E drainage memo or letter. Any necessary engineering calculations or explanation should be aN �, provided in the submittal. D" The designer/contractor is to provide an as -built survey, when requested, of the constructed N a stormwater facilities upon final completion of the project for acceptance by Weld County and g`'NY•, issuance of any Certificate of Occupancy. An As -Built Drawing Checklist is included in Appendix a�iN ro-_ D. The survey will be conducted, signed, dated, and sealed by a Professional Land Surveyor :611 licensed to practice in the State of Colorado. At a minimum, the as -built drawings shall include: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 136 1. Drawing showing design contours versus as -built contours of constructed pond/site (1 -foot contour intervals, labeled) 2. Spot elevations at critical drainage design points: • Pond outlet structure • Pond emergency spillway, start and end of riprap or other required protection • Pipe/inlet elevations • Structure inverts • Exposed groundwater elevation, if applicable ▪ 3. Pond design volume (stage -storage tables) versus as -built volumes. The designer/contractor shall submit a Statement of Compliance signed and stamped by a Colorado Professional Engineer that verifies in writing that the pond as -built volume meets the design volume requirements. 4. Drawings shall be properly scaled and sized to clearly show the work that was done through construction. The contractor shall provide signed and stamped Engineered copies of relevant plans and details with updates including the following, but not limited to, updated elevations, am3. dimensions, and pipe sizes. oa 5. All appurtenances and related features shall be located horizontally and vertically by the N.o-+- surveyor. -- s "l; Due to a project's scope and/or location, special permits may be required. Such permits may include construction permits, floodplain permits, and environmental permits. Requirements for special permits are dictated by the approving department or agency. 5.3.2 Data Collection rpY The County uses information and data provided by FEMA, the National Oceanic and Atmospheric tee. Administration (NOAA), the U.S. Geological Survey (USGS), private consulting engineers, and the •7m300 Colorado Water Conservation Board (CWCB). Before commencing design of any drainage project, designers should collect and evaluate data for the particular watershed area under consideration. Unless explicitly stated otherwise, Weld County will allow the use of data collection methodologies other than what is recommended in this WCECC on a case -by -case basis when complete documentation of all assumptions is provided. Weld County reserves the right to review alternatives and compare with other commonly used approaches, including those discussed in the USDCM. 5.4 RAINFALL The designer should use the most appropriate and best available data for the project area in determining the rainfall quantities. Local rainfall data shall be obtained from NOAA Atlas 14: Precipitation -Frequency Atlas of the United States, Volume 8 (Atlas 14) unless otherwise approved by the Department of Public Works, or unless otherwise specified in urbanized jurisdictions and existing master plans. The use of synthetic rainfall distribution data is not permitted. 5.4.1 Intensity Duration Curves for Rational Method To develop depth -duration curves or intensity -duration curves for the Rational Method of runoff analysis, the 1 -hour depth(s) obtained from NOAA Atlas 14 can be applied to Equation 5-1 below for the duration (or durations) of interest: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 137 28.5P1 1 =(l0+Td)o.7s6 Where: • 1= rainfall intensity (inches per hour) • P1= 1 -hour point rainfall depth (inches) • Td= storm duration (minutes) Eq. 5.4.1 For more details regarding the development of rainfall information, refer to the Rainfall chapter of the USDCM, Volume 1. 5.5 RUNOFF For more details regarding the development of runoff information, refer to Chapter 8, Article XI, of the Weld County Code and the Runoff chapter of the USDCM, Volume 1. The County explicitly uses the 2007 version of the Runoff chapter of USDCM, Volume 1 and, as such, it has been made available on the Weld County website. Depending on the size and location of a project, there are three allowable stormwater runoff calculation methods. Table 5-1 below summarizes the allowable methodology. When designing a site with multiple detention basins in parallel or series, the use of Stormwater Management Model (SWMM) is required for routing. Weld County does not allow the use of CUHP. 4944675 Pages: 130 of 285 02/15/2024 12:24 PM R Fie:00.00 Carly Koppel, Clerk and Recorder, Weld County , CO IIIII MINKCifar'0I9I.livi II II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 138 Table 5-1 Runoff Coefficient Equations for Weld County/2008 MHFD (HSG-a) Size of Basin Allowable Runoff Calculation Method Less than 5 acres Rational Method required 5 to 160 Acres Rational Method or SWMM allowable Greater than 160 acres SWMM is required 5.5.1 The Rational Method The Rational Method is a simplistic method for determining peak runoff from a proposed development or road construction project. It should not be used for basins greater than 160 acres. Refer to the Runoff chapter of the USDCM, Volume 1 provided on the County Website for more information regarding application of the Rational Method. The design engineer shall use the Rational Method to perform runoff calculations (for basin sizes under 160 acres). The spreadsheet used to perform runoff calculations, UD-Rationalv1.02, is available for download on the Department of Public Works Zoning's Development Review webpage. This spreadsheet utilizes the rational method "C -values" from the 2007 design manual (shown in Table 5-3 through Table 5-5 below). The design consultant may use the downloadable spreadsheets or may create their own based on the information provided in the following portion of this document. The created spreadsheets must use the older 2007 C -values to be accepted. A copy of these runoff coefficients are provided in Appendix E and on the Department of Planning and Zoning's Development Review webpage. The rational formula is as follows: Q=CxIxA Where: Q = peak runoff rate, cfs C = runoff coefficient, dimensionless I = rainfall intensity at the time of concentration, in/hr A = area of the basin, acres Eq. 5.5.1 The runoff coefficient, C, represents the effects of infiltration, evaporation, retention, and interception and is calculated based on the soil type and impervious percentages. Higher impervious percentage values (roofs, parking lots) mean the area does not readily allow water to infiltrate into the ground, whereas lower impervious percentage values (parks, green space) mean the area does allow water to infiltrate into the ground. The recommended impervious percentage values, I, for Weld County are provided in Table 5-2, below. 4844575 Paseo: 131 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp's, Clark and Raoordar, Wald County , CO VIII PAU aliiii1DIMANde'rR&IIIAIP4I Bill WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 139 Table 5-2 Percentage Impervious Values for Weld County Land Use or Surface Characteristics Percent Impervious (%) Commercial 95 Residential: Single -Family Greater than 2.5 acres or larger 12 Greater than 0.75 acre to 2.5 acres 20 Greater than 0.25 acre to 0.75 acre 30 0.25 acre or smaller 45 Multi -Unit Detached 60 Multi -Unit Attached 75 Apartments 80 Industrial: Light 80 Heavy 90 Solar Facilities: A & B Soils 2 C & D Soils Site -specific Parks, Cemeteries 10 Playgrounds 25 Schools 55 Railroad Yard Areas 50 Roofs 90 Undeveloped Areas: Historic Flow Analysis 2 Greenbelts, Agricultural 2 Streets: Paved 100 Packed Gravel (Includes Road Base and Compacted, Cleared, Earthen Areas typically used for Roads/Parking/Storage) 40 Recycled Asphalt Pavement 75 Drives and Walks 90 Table 5-3 through Table 5-5 use the impervious percent value (expressed as a decimal) to calculate the runoff coefficients for Natural Resources Conservation Service (NRCS) hydrologic soil groups A, B, and C/D for various storm return periods. 4844675 Pages: 132 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koops., Clark and Recorder, Wald County , CO lIII KM NaMIIIHMA r JLII 1/2 UALIVAIM ilk till WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 140 Table 5-3 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-A) Equation Hydrologic Soil Group A 5 -Year 10 -Year 100 -Year Cs= (-0.08i+ 0.091+ (1.31i3- 1.4412 + 1.135i - 0.12) Cu = (-0.14i + 0.17) + (1.31i3 -1.44i2 + 1.135i - 0.12) Cue = (-0.25i + 0.32) + (1.31i3 - 1.44i2 + 1.135i - 0.12) 2% 0.00 0.07 0.22 5% 0.02 0.10 0.24 10% 0.06 0.14 0.28 15% 0.10 0.17 0.30 20% 0.13 0.20 0.33 25% 0.16 0.23 0.35 30% 0.19 0.25 0.37 35% 0.22 0.28 0.39 40% 0.25 0.30 0.41 45% 0.27 0.33 0.43 50% 0.30 0.35 0.45 55% 0.33 0.38 0.47 60% 0.37 0.41 0.50 65% 0.41 0.45 0.53 70% 0.45 0.49 0.56 75% 0.50 0.54 0.61 80% 0.56 0.60 0.66 • 85% 0.63 0.66 0.72 90% 0.71 0.73 0.79 95% 0.80 0.82 0.86 100% 0.90 0.92 0.96 4944675 Pages. 133 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppss, Clerk and Recorder, Weld County , CO VIII INFA I hf i1h II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 141 Table 5-4 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-B) Equation Hydrologic Soil Group B 5 -Year 10 -Year 100 -Year Cs = (Ca + Cull 2 Cio = (Ca + Cull 2 Cwo = (Ca + Cull 2 2% 0.08 0.17 0.36 5% 0.10 0.19 0.38 10% 0.14 0.22 0.40 15% 0.17 0.25 0.42 20% 0.20 0.27 0.44 25% 0.22 0.30 0.46 30% 0.25 0.32 0.47 35% 0.27 0.34 0.48 40% 0.30 0.36 0.50 45% 0.32 0.38 0.51 50% 0.35 0.40 0.52 55% 0.38 0.43 0.54 60% 0.41 0.46 0.56 65% 0.45 0.49 0.59 70% 0.49 0.53 0.62 75% 0.54 0.58 0.66 80% 0.59 0.63 0.70 85% 0.66 0.69 0.75 90% 0.73 0.75 0.81 95% 0.81 0.83 0.88 100% 0.90 0.92 0.96 4944675 Pages: 134 of 285 02/15/2024 12:24 PM R Fse:$0.00 Carly Kappa., Clerk and Recorder, Wald County , CO mIII I �JoiI�I�I��rM�+W�'rk��P 1r�%1 �� i 111 II 1 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 142 Table 5-5 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG C/D) Equation Hydrologic Soil Group C/D 5 -Year 10 -Year 100 -Year Cs = (-0.10i + 0.111+ )0.858i3 - 0.786i2 + 0.774i + 0.04) Co = (-0.18i + 0.21) + )0.858i3 - 0.786i2 + 0.774i + 0.04) Cue = (-0.39i + 0.46) + (0.858i3- 0.786i2 + 0.774i + 0.04) 2% 0.16 0.26 0.51 5% 0.18 0.28 0.52 10% 0.21 0.30 0.53 15% 0.24 0.32 0.54 20% 0.26 0.34 0.55 25% 0.28 0.36 0.56 30% 0.30 0.38 0.57 35% 0.33 0.40 0.57 40% 0.35 0.42 0.58 45% 0.37 0.44 0.59 50% 0.40 0.46 0.60 55% 0.43 0.48 0.62 60% 0.46 0.51 0.63 65% 0.49 0.54 0.65 70% 0.53 0.57 0.68 75% 0.58 0.62 0.71 80% 0.63 0.66 0.74 85% 0.68 0.71 0.79 90% 0.75 0.77 0.83 95% 0.82 0.84 0.89 100% 0.90 0.92 0.96 5.5.1.1 Time of Concentration The time of concentration is calculated based on the length, slope, and cover in the basin. The time of concentration is calculated by adding the initial or overland flow time and the channelized travel time. Where: tc = tti + tt t, = Time of concentration, minutes t, = Initial or overland flow time, minutes tc = Channelized travel time, minutes 5.5.1.2 Initial or Overland Flow Time The initial or overland flow time will be calculated as follows: 4944875 Pages: 135 of 285 02/18/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Raoordar, Wald County , CO VIII LI *EP MIN 111111 Eq. 5.5.1.1 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 143 o - U Where: ti 40.33 0.395(1.1—CS)X Eq. 5.5.1.2 L,= Length of overland flow, ft (500 ft maximum for non -urbanizing undeveloped areas, 300 ft maximum for urbanizing or developed areas) So= Overland basin slope, ft/ft 5.5.1.3 Channelized Flow Time The channelized flow time (travel time) will be calculated as follows: Where: _ Lt _ Lt tt 60K So 60V Lc= Waterway length, ft So= Waterway slope, ft/ft K= NRCS Conveyance Factor (see Table 5-6) V= Travel time velocity, ft/s Table 5-6 NRCS Conveyance Factor, K Type of Land Surface NRCS Conveyance Factor Tillage/Field 5 Short pasture and lawns 7 Nearly bare ground 10 Grassed waterway 15 Paved areas and shallow paved swales 20 Eq. 5.5.1.3 Nm�� %%4 5.5.1.4 Urban Check �LL o For developed and urbanizing basins, the maximum time of concentration shall not exceed the time of .-. g concentration calculated by the urban check equation as follows: wE�z reS = Lt + 10 ��i 180 Where: N � „NYir=g`ti L, Waterway length, ft The minimum time of concentration for urbanizing areas is 5 minutes and the minimum time of concentration for non -urbanizing areas is 10 minutes. 4944875 Pales: 138 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and R.00rdmr, Wald County , Co VIII NU�� LR ti 'h�1�Mti1�l r�� l r il'r'��I��LI � IY 11111 Eq. 5.5.1.4 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 144 5.5.2 Larger Basin Rainfall Methods Based on Table 5-1, areas larger than 160 acres require use of the SWMM, developed by the Environmental Protection Agency (EPA). The designer should use the most up-to-date version of SWMM. Any supporting modeling data should be included in the drainage report appendices, so that review staff can adequately review the model. Supporting documentation should include basin information, infiltration method used (with supporting coefficients, curve numbers, soil types), rainfall data, stage - storage curves for ponds and any other pertinent information for the model. Electronic submittals of the SWMM model are required with each submittal package for review by County staff. 5.6 ROADS, INLETS, AND STORM DRAINS Stormwater collection and conveyance systems (roads, inlets, and storm drains) for new developments shall be designed to convey the 100 -year storm event to the proposed detention/retention pond. Street flooding may occur, in which case traffic is disrupted as the street functions as an open channel (see Section 5.8). In these cases, the design engineer shall ensure that any flooding or surcharge of the system shall maintain public safety, minimize flood damages, and allow for emergency vehicle access as required by the local agency. Sizing of inlets, pipe systems, culverts or other drainage collection systems on private development sites should be designed to safely convey flows through the site, in a manner that will protect the site's users from harm and will not cause damage to on -site structures. The design engineer for the project shall provide calculations for pipe sizes, overtopping of roads, ditches, etc., such that the County's review engineers can verify that the drainage on -site is safe for users. The County reserves the right to comment on private drainage systems that they see as being unsafe or inadequate for the intended site use. The 100 -year developed flows must be transported safely to the site's detention pond for a controlled release. For information regarding the design of stormwater collection and conveyance systems, refer to Chapter 8, Article XI, of the Weld County Code and the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1. 5.6.1 Applicable Software It is acceptable to use HydroFLOW, CivilStorm, HY-8, FlowMaster, and StormCAD softwares to determine the hydraulic characteristics of storm networks/culverts. Inlet spread calculations and street capacities with curb and gutter to be analyzed using newest version available of MHFD's UD-Inlet spreadsheets provided on their website. Alternative modeling software may be used upon approval by the Department of Public Works. 5.6.2 Roadway Drainage Roadway classifications in Weld County are described in Section 2.1 of this WCECC and include freeways (interstates), county highways, arterials, collectors, local roads, and privately maintained roads. For collector roads, local roads, and privately maintained roads, the maximum encroachment depth over the roadway crown is 6 inches during the 10 -year storm and 18 inches during the 100 -year storm. Pages:137 285 02/15/2024 12 24PM R Fee$0 00 Carly Kopp., Clerk and Reoorder, Weld County , CO VIII NUr.��M�rl�Wlh��l WHIP Rat)! h III II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 145 Allowable roadway overtopping for interstates, county highways, and arterials shall be determined by the Public Works Director or Designee. 5.6.3 Inlets The design guidelines provided in the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1 should be used when designing stormwater inlets. In general, the allowable road capacity and maximum encroachment depth shall dictate the placement of inlets. Inlets should be placed at low points (sumps), median breaks, intersections, super -elevation transitions, and before cross walks and bridges, as required. The standard inlets permitted for use in Weld County streets and roads are shown in Table 5-7. Weld County has adopted CDOT (Type C, Type D, Type R and Type 13) and Greeley (Combination Type 3) Inlet detail, with modifications as provided in details sheets. See Appendix J. Note: Inlet Types C and D will require close mesh grates as directed by Weld County. Table 5-7 Inlets for Weld County Inlet Type Permitted Use Curb Opening Inlet Type R All street types with 6 -inch vertical curb Grated Inlet Type C, D Roadside ditches or swales Grated Inlet Type 13 Alleys or private drives with a valley gutter Combination Inlet Type 3 All street types with 6 -inch vertical curb Various factors, such as debris clogging, pavement overlaying, and variations in design assumptions can decrease the capacity of inlets. To account for these factors, Weld County recommends that the theoretical capacity calculated for inlets be reduced by the factors presented in Table 5-8. Table 5-8 Theoretical Capacity of Inlets for Weld County c _ N°.3- va a0 v L MtL � a N 5.6.4 Pipes The design guidelines provided in the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1 should be used when designing stormwater pipes. Pipe networks shall be sized to convey the 10 -year Condition Inlet Type Percent of Theoretical Capacity Allowed Sump or continuous grade Curb Opening Type R (5 -ft Length) 2 88 Curb Opening Type R (10 -ft Length) 2 92 Curb Opening Type R (15 -ft Length) 2 95 Continuous grade Combination Inlet Type 3 66 Sump 'Grated Inlet Type C or D2 50 Grated Inlet Type 132 50 Combination Inlet Type 3 65 ' Type C and D inlets shall not be placed in roadways 2 CDOT Standards, with modifications WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (46 storm event while flowing at 80 percent of the full pipe capacity. In the 100 -year event, the hydraulic grade line (HGL) shall be kept at least one foot below manhole lids, inlet grates, and inlet curb openings. The calculated HGL for both the minor and major storm events shall be provided on all proposed final storm profile views. The minimum flow velocity (for both storm events) shall be 3 ft/s to minimize EG sediment deposition. Maximum flow velocity (for both storm events) shall not exceed 18 ft/s to minimize scour at the outlet. Erosion protection at the pipe outlet is required for all velocities greater than or equal to 3 ft/s. Riprap should be used at pipe outlets and have a minimum D. of 9 inches 0 (Type L). The minimum allowable size for a storm sewer within a public right-of-way or public drainage easement shall be 15 inches in diameter or equivalent. The Department of Public Works should be contacted to Ha determine which types of storm sewer pipes are permissible for use in public rights of way or public •F3S drainage easements. Pipes constructed under the travel lanes of a new public roadway shall be o'-:� reinforced concrete pipe (RCP), Class 3 strength or greater, depending on traffic loading, or an approved ri!l equivalent. All RCPs shall have a minimum cover of 12 inches above the pipe crown and bell to the bottom of pavement section (asphalt or concrete) at the edge of the roadway. A minimum of 12 inches as ` of cover above the pipe crown to the top of the finishedgrade is required for gravel roads. If 12 inches P•p q of cover is not possible, the pipe material must be rated for a minimum of HS -20 loading or the largest expected loads crossing it (i.e., oil rigs, semi -trucks, etc.). The contractor must provide shop drawings for amia a any precast concrete box culvert (CBC) to be approved for use by the engineer. 2Y�� 12®& The Manning's roughness coefficient "n" for all storm sewer capacity calculations in Weld County shall aaei■ be 0.013 regardless of pipe material e.g., concrete, polyvinyl chloride [PVC], or high -density polyethylene [HDPE])—with the exception of aluminized corrugated metal pipe (CMP), which shall have a coefficient of 0.025. However, the designer should take note that only RCP and CMP are allowed in public ROW due to ditch burning. Any other pipe material used shall only be placed outside of public ROW, or upon approval by the Department of Public Works. 5.6.5 Manholes U Manholes shall be provided to allow for inspection and maintenance of stormwater systems. At a o{� minimum, manholes shall be placed at all pipe junctions, changes in pipe size or material, and changes in grade and alignment. For long straight runs of pipe, the distance between manholes shall be limited to Nm 400 feet(for pipe diameters < 42 inches and 500 feet(for pipe diameters 5 42 inches). Manhole lids P�P ) P P ) c�A shall not be located within the vehicle wheel path. MLL�r! � k 1E34E T v L G.Na3l Nv aQ Iflma Table 5-9 Manhole Sizes Storm Pipe Diameter (inches) Manhole Diameter (ft) 15 inches to 18 inches 4 ft 21 inches to 30 inches 5 ft 36 inches to 54 inches 6 ft 60 inches + CDOT Standard M-604-20 It shall be noted that the designer should review the incoming and outcoming pipe angles to ensure that the manhole diameter can accommodate the pipe skew, when the pipe sewer alignment is not straight WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 47 through, or when more than one sewer line goes through the manhole. Steps shall be provided to allow safe access into the manhole. Manhole details are provided in Appendix J 5.7 OPEN CHANNELS, ROADSIDE DITCHES, AND GRASS SWALES It is important to distinguish the difference between channels, ditches, and swales. Open channels and grass swales often are existing drainage conveyances that either carry large offsite flows around a site or carry onsite flows to a detention pond on -site. County -owned roadside ditches are common along rural roads and provide runoff conveyance for the County's roadway infrastructure. Irrigation ditches are not considered to fall under any of these definitions and shall be treated as separate infrastructure altogether. Open channels, grass swales, storm pipe systems, and culverts located on new development sites need to ensure runoff from the developed site for the 100 -year storm event can safely reach the on -site detention pond with adequate capacity and freeboard. This can be a combination of overland flow, pipes, or swales to get the runoff to the pond, without it leaving the site. The design engineer needs to provide calculations to show that the 100 -year developed flows make it to the pond without overtopping or exceeding the capacity of the proposed drainage system. Any off -site flows that are planned to be routed around the developed site must be designed using a 100 -year runoff value, so that no unplanned flows enter the proposed site that were not planned for in the detention pond's spillway calculations. Roadway ditches that are designed by consultants for the County (for County -owned and maintained roadways only) may use a developed runoff from the 10 -year, 1 -hour storm event in their ditch designs. For more information regarding the design of open channels, refer to Chapter 8, Article XI, of the Weld County Code and the Open Channels chapter of the USDCM, Volume 1. Information regarding the design of roadside ditches is provided in the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1. If grass swales are used, they shall be designed in accordance with the Grass Swales Fact Sheet (T-2) of the USDCM, Volume 3. 5.7.1 Applicable Software The design of open channels, grass swales, and roadside ditches is to be completed in FlowMaster or Hydraflow Express Extension for Autodesk software. Channels, swales, and roadside ditches will be designed to account for any erosive or hazard conditions. It is acceptable to use USACE's HEC-RAS software to determine the hydraulic characteristics of large open channels. HEC-RAS modeling shall be performed to align with standard modeling practices accepted by FEMA. It is the designer's responsibility to effectively model erosive, hazard, or local scour in a channel for estimating maximum velocities. The designer shall create a model that adequately places the correct number of cross sections in the necessary locations to accurately make an evaluation of velocities throughout the channel to determine its erosive and scour potential. 5.7.2 Open Channels and Swales Generally, channels and swales should be designed as a trapezoidal shape with a minimum two -foot bottom width and side slopes no steeper than 4:1. If, however, steeper slopes are required due to site WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (48 constraints, the design engineer should address how the channels will be maintained, since it may not be safe to mow on slopes that are greater than 4:1. The design engineer also should consider the appropriate seed mix and seeding application method when determining side slopes. More information on seed mixes and revegetation can be found in Chapter 6 of this WCECC. Open channels and swales shall be designed to allow the 100 -year design flow plus a minimum of one foot of freeboard. However, channels conveying less than 20 cfs may reduce the minimum one -foot freeboard requirement to the freeboard required to convey 1.33 times the 100 -year design flow. The reduced freeboard may only occur if a one -foot minimum freeboard is not physically possible, and calculations are submitted. Hydraulic structures (check/drop structures, bridges, transitions, constrictions, bends, confluences, rundowns) associated with open channels shall be designed for the 100 -year storm event. For more information regarding the design of hydraulic structures, refer to Chapter 8, Article XI, of the Weld County Code, the most recent version of Hydraulic Structures chapter of the USDCM, Volume 2, and Chapter 4.7 - Bridges of this WCECC. MHFD has published guidelines for typical Manning's n values and other design criteria for "V" and trapezoidal swales. Table 5-10 through Table 5-12 and Figure 5-2 and Figure 5-3 below provide guidance for channel design. 4944675 Pages: 141 of 285 02/15/2024 1Clerk and 4 PM Records 3®Wi d County , CO Carly Kopp�a, IIIII ROOF IdliIL YAM A(4 l+ K I:Mk 1I II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 149 Table 5-10 Roughness Coefficients ("n") for Channel Design (After Chow 1959) Channel Type Roughness Coefficients (n) Minimum I Typical I Maximum I. Excavated or Dredged 1. Earth, straight and uniform a. Gravel, uniform section, clean 0.022 0.025 0.030 b. With short grass, few weeds 0.022 0.027 0.033 2. Earth, winding, and sluggish a. Grass, some weeds 0.025 0.030 0.033 b. Dense weeds or aquatic plants 0.030 0.035 0.040 c. Earthy bottom and rubble/riprap sides 0.028 0.030 0.035 3. Channels not maintained, weeds and brush uncut a. Dense weeds, high as flow depth 0.050 0.080 0.120 b. Clean bottom, brush on sides 0.040 0.050 0.080 II. Natural streams (top width at flood stage 100 ft) 1. Streams on plain a. Clean, straight, full stage, no rifts or deep pools 0.025 0.030 0.033 Clean, winding, some pools and shoals, some b. weeds and stones 0.035 0.045 0.050 Very weedy reaches, deep pools, or floodways c. with heavy stand of timber and underbrush 0.075 0.100 0.150 III. Lined or Built -Up Channels 1. Concrete a. Trowel/float finish 0.011 0.015 0.016 b. Shotcrete 0.016 0.020 0.025 2. Gravel bottom with sides of: a. Formed concrete 0.017 0.020 0.025 b. Random stone in mortar 0.020 0.023 0.026 c. Dry rubble or riprap 0.023 0.033 0.036 3. Wetland Bottom Channels See Figure 5-2 4. Grass -Lined Channels and Swales See Figure 5-3 4944875 Puma: 142 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppes, Clerk and Recorder, Weld County , CO i3/44 YV II II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 150 Figure 5-2 Manning's n vs. Depth for Low -Flow Section in a Composite Channel .070 .065 .060 3 .055 •, .050 S co g .045 .040 .035 .030 n=0.0001(Y)-0.0025(Y)+0.050 n = 0.0019(YZ - �- - 0.0206(Y) + 0.099 2 3 4 5 6 7 8 Depth of Flow Y, in Feet 4844875 2/1 5% 2024 12:24 Pages R Fee:$0.00 005 Carly Kopper, Clark and Recorder, Wald County , CO IN IMP RigNI J L 11111 9 10 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 151 Figure 5-3 0.5 0.4 M 0 2 z Z 0.3 02 0.1 08 06 05 Manning's n vs. VR for Two-Retardances in Grass -Lines Channels /--- Channel capacity design curve (C) Retardance D) Limiting velocity design curve 0.2 0.3 04 0506 08 1.0 2 3 4 5 6 8 10 20 30 VR, PRODUCTOF VELOCITYAND HYDRAULIC RADIUS From "Handbook of Channel Design For Sod and Water Conservation,: U.S. Department of Agriculture, Soils Conservation Service, No. SCS-TP-61 March, 1947, Rev. June, 1954 Table 5-11 Trapezoidal Channel Design Guidance/Criteria Design Item Criteria for Various Types of Channel Lining Grass: Erosive solo Grass: Erosion Resistant Soils Riprap Concrete Maximum 100-yr Velocity 3.0 ft/sec 5.0 ft/sec 12.0 ft/sec 18.0 ft/sec Minimum Manning's n - capacity check 0.030 0.030 0.030 0.011 Maximum Manning's n - capacity check 0.035 0.035 0.040 0.013 Maximum Fronde Number 0.5 0.8 0.8 n/a Maximum side slope 4H:1V 4H:1V 2.5H:1V 1.5H:1V Minimum centerline radius for a bend 2 x top width 2 x top width 2 x top width 2 x top width Minimum freeboard 1.0 ft 1.0 ft 1.0 ft 1.0 ft 5.7.3 Roadside Ditches The designer shall design flexible ditch linings based on FHWA's Design of Roadside Channels with Flexible Linings, Hydraulic Engineering Circular No. 15 (HEC-15) guidelines and should coordinate with the Department of Public Works for approval of the chosen lining. Riprap-lined ditches shall have a minimum Dso of 9 inches (Type L). Roadside ditches shall be designed to maintain a minimum of one foot of freeboard during the 10 -year storm event. Design criteria, provided in the previous Open Channels and Swales section, should be used in the design of roadside ditches as well. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 152 5.8 CULVERTS Culverts are structures that convey flow through embankments such as roadways and railroads and should not be confused with storm drainage systems. If a project uses culverts in any facet and connects to County facilities, then the culvert and associated facilities must convey the 100 -year storm event flow. A culvert is required for every new access point or supporting documentation must be provided to the County to show that a culvert is not needed. For more information regarding the design of culverts, refer to Chapter 8, Article III, Article XI, and Appendix 8-B of the Weld County Code and the Culverts and Bridges chapter of the USDCM, Volume 2. See also the latest edition of AASHTO's Roadside Design Guide. 5.8.1 Applicable Software It is acceptable to use FHWA's HY-8 or CulvertMaster culvert analysis software to determine the hydraulic characteristics of culverts. Alternative modeling software may be used upon approval by the Department of Public Works. 5.8.2 Sizing Culverts shall be sized such that any roadway overtopping meets allowable street capacity and maximum encroachment depth requirements. The minimum allowable size for a culvert within a public right-of-way or public drainage easement shall be 15 inches in diameter or equivalent. Weld County may require additional culvert capacity to prevent flooding and backwater effects on adjacent properties. The storm drainage system for a developed site, via culverts, inlets, swales, pipe systems, must provide adequate capacity to safely convey the 100 -year developed runoff to the site's detention/retention pond without leaving the site. If the culvert/pipe system is undersized and results in flooding, the flooding must be contained onsite. It should be shown that on -site flooding does not impact permanent structures or buildings on -site. Developed runoff from the site may not adversely impact adjacent or downstream properties. The maximum overtopping of local or collector County roads during the 10 -year storm event is 6 inches and 18 inches in the 100 -year event. However, the County prefers to minimize overtopping to the greatest extent possible. Allowable roadway overtopping for county highways and arterials shall be determined by the Public Works Director or Designee. Private culverts/swales within developments must be sized to provide adequate capacity to carry runoff from the 100 -year event safely to the proposed detention/retention pond. Additionally, culverts must be sized to meet the maximum headwater to depth ratios (HW/D) listed in Table 5-12. 4944875 Pages: 145 of 285 02/15/2024 12:24 PM R Faa:$0.00 Carly Kopp., Clerk and Raoord.r, Weld County , CO VIII 1 M Kh 14141Vi lI.ti41 !JAW li1 lkall If: II II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 153 Table 5-12 Maximum HW/D Requirements for Weld County Range of Diameter or Height or Rise (Inches) Maximum HW/D Less than 36 inches 2.0 36 inches to 60 inches 1.7 Larger than 60 inches but less than 84 inches 1.5 84 inches to less than 120 inches 1.2 120 inches or larger 1.0 Culverts shall be installed to the minimum slope required to achieve a minimum flow velocity of 3 ft/s to minimize sediment deposition within the pipe. The slope should be checked for each design, and if the proper minimum velocity is not obtained, other design options should be evaluated. Maximum velocity at the culvert exit should be consistent with the velocity in the channel to which it discharges so as to reduce the risk of scouring at the culvert outlet. Energy dissipators may be required and shall be designed per the most recent version of Hydraulic Structures chapter of the USDCM, Volume 2, and the guidelines in the FHWA Hydraulic Design of Energy Dissipators for Culverts and Channels, Hydraulic Engineering Circular No. 14 (HEC-14). 5.8.3 Materials Weld County allows the installation and use of commonly available culvert types such as RCP and aluminized CMP within the public right-of-way. Weld County will allow the use of other culvert types on a case -by -case basis when complete documentation of all culvert specifications is provided. It should be noted that pipe materials that do not withstand high temperatures (burning of roadside ditches), should not be used within the County ROW. 5.8.4 Cover All culverts must be installed with a minimum of 12 inches of cover above the pipe crown and bell to the bottom of asphalt at the edge of pavement (for paved roads) and a minimum of 12 inches of cover above the pipe crown to the top of the finished grade (for gravel roads). If 12 inches of cover is not possible, the culvert material must be rated for a minimum of HS -20 loading or the largest expected loads crossing it (i.e., oil rigs, semi -trucks, etc.). 5.8.5 End Sections and Safety Grate At a minimum, culverts installed in public rights -of -way must be equipped with a flared end section or headwalls on the culvert entrance and outlet, as directed by Public Works. Cutoff walls below the outlet end section shall be 4,500 psi concrete with epoxy coated #5 rebar 12" on center each way, three inches clear from all earthen edges, 8" wide x 3' deep and 2' beyond each outside edge of the end section. There may be situations in which other types of culvert inlets are necessary. In those situations, the design methodologies outlined in the Culverts and Bridges chapter of the USDCM, Volume 2 should be used. Safety grates are strongly recommended at culvert entrances to prevent people, animals, and large debris from inadvertently entering a culvert. Safety grates shall not be placed at the outlet of culverts or storm drains. The following conditions may require use of a safety grate: • It is not possible to see daylight from one end of the culvert to the other. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 154 • The culvert is less than 42 inches in diameter. • Conditions within the culvert (bends, obstructions, vertical drops) or at the outlet are likely to trap or injure a person. Exceptions to the above criteria consist of street curb -opening inlets and driveway culverts that are subject to ponding depths no greater than 12 inches at the flowline and culvert entrances that are made inaccessible to the public by fencing. Sound engineering judgement should be used to determine the need for a safety grate while also considering hydraulic forces and clogging potential. Undersized or poorly designed grates can become clogged during heavy runoff and the culvert may be rendered ineffective. Additionally, the surrounding site features and depth and velocity of flow may increase the risk of pinning a human or animal against the grate. To minimize these hazards, safety grates should be sized according to the Outlet Structures Fact Sheet (T-12) of the USDCM, Volume 3 and designed to meet the following criteria: • Grates should be inclined at a slope no steeper than 3:1 (flatter is better) and have a clear opening at the bottom of no more than 9 inches to permit passage of debris and bed load at lower flows. Weld County does not allow the use of collapsible gratings. 5.8.6 Maintenance The County will maintain culverts located within the County ROW. Private property owners are responsible for maintenance of their culverts. Culverts that are part of a subdivision drainage plan are maintained by the respective homeowner's association. Those culverts should be maintained and cleaned out on an as -needed basis to ensure proper drainage of the subdivision. Safety grates should be inspected and cleaned after every large storm event (at a minimum) to ensure that the systems remain effective and that clogging and pinning risks are minimized. 5.9 RIPRAP Riprap should be included on the downstream end of culverts and pipe systems to provide erosion protection. The following direction should be used when designing riprap aprons at the outlet of culverts and pipe systems. Mirafi FW-300 or approved equivalent shall be installed under all riprap. al 5.9.1.1 Configuration of Riprap Apron 2 Figure 5-4 illustrates typical riprap protection of culverts outlets. 8::i 5.9.1.2 Extent of Protection f The length of the riprap protection downstream from the outlet depends on the degree of protection in desired. If it is necessary to prevent all erosion, the riprap must extend until the velocity decreases to an Nm3s acceptable value. The acceptable major event velocity is set at 3 ft/sec for non -cohesive soils and at 5 o+% -?J ft/sec for erosion resistant soils. The rate at which the velocity of a jet from a conduit outlet decreases is R. o not well known. The procedure recommended here assumes the rate of decrease in velocity is related to �a the angle of lateral expansion, 8, of the jet. The velocity is related to the expansion factor, ( n e) , PYg which can be determined directly using Figure 5-5 or Figure 5-6 by assuming the expanding jet has a aN rectangular shape: NVZ m gV N rN O k WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (55 OIN` �mii� = At Lp (2t10)Q—w) an Yt Where: Lp = Length of protection (ft) - W = Width of the conduit (ft, use diameter for circular conduits) - Yt = Tailwater depth (ft) 0 = The expansion angle of the culvert flow O and: Eq. 5.9.1 � 4. At = Q Eq.5.9.2 am3i Where: °;;-12 At = required area of flow at allowable velocity (ft2) r �"6_ V = the allowable non -eroding velocity in the downstream channel (ft/sec) 1Eil Q = design discharge (cfs) rei.- . For Eq. 5.9.1: .rV? a i If the tailwater elevation is unknown or unable to be calculated, a value of 0.4 x the culvert wAIR height or pipe diameter may be used for Yt. LqNY._� .m. °®ate The expansion factor ( 1 ) can be found from Figure 5-5 and Figure 5-6 shown below, after 2 tan 0 calculating Q/D2.5. In the calculations for At, the allowable non -eroding velocity in the downstream channel should be: o 3.0 ft/sec for erosive soils o 5.0 ft/sec for non -erosive soils In certain circumstances, Eq. 5.9.1 may yield unreasonable results. Therefore, in no case should Lp be less than 3H or 3D, nor does L2 need to be greater than 10H or 10D whenever the Froude parameter, Q/WH1.5 or Q/D2.5, is less than 8.0 or 6.0, respectively. Whenever the Froude parameter is greater than those maximums, increase the maximum L2 required by'AD, or'AH for circular or rectangular (box) culverts, respectively, for each whole number by which the Froude parameter is greater than 8.0 or 6.0, respectively. Once Lp has been determined, the width of the riprap protection at the furthest downstream point should be verified. This dimension is labeled "T" on Figure 5-4. The first step is to solve for 0 using the results from Figure 5-5 or Figure 5-6: 0 = tan -1 2 (ExpansionFactor) Where: • Expansion Factor = determined using Figure 5-5 or Figure 5-6 Eq. 5.9.3 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 156 T = 2 (L, tanO) + W Eq. 5.9.4 Figure 5-4 Riprap Apron Detail for Culverts In Line with the Channel (USDCM, Vol 2 Figure 9-34) EXTEND RIPRAP TO HEIGHT OF PIPE OR BOX, MIN. D, OR 2' MIN T then is calculated using the following equation: • 01, --7 O[g a Y r¢sw A � d~•L NO • �Y`� a am sU- RIPRAP MORE THAN 1.0' ABOVE PIPE INVERT SHALL BE INSTALLED 6" BELOW FINISHED GRADE AND BURIED WITH TOPSOIL FINISHED GRADE TOEWALL 8"' THICKNESS 3' MINIMUM DEPTH GEOTEXTILE EROSION CONTROL. MIRAFI 300 OR EQUAL PLAN NTS END TREATMENT MAY CONSIST OF RCP END SECTION (WITH TOEWALL) OR HEADWALL 2D. MIN PROFILE NTS 05 01 05 SOIL RIPRAP OR VOID -FILLED RIPRAP WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 157 Figure 5-5 Expansion Factor for Circular Conduits (USDCM, Vol 2 Figure 9-35) 9 = Expansion Angle EXPANSION FACTOR , 0 7 6fif 5 � o '�� ,O OZ:1 to p b• o 4 b0 3 _ /6. 2 /� 1 Cl 1 _2 3 4 .5 4 .7 .E TAILWATER DEPTH/ CONDUIT HEIGHT, Yt/D D 4944675 Pages: 150 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppas, Clark and Records, Wald County , CO VIII MrlNl kidigwll'ildell! 4I.IMEll MK Ilk 1111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 158 Figure 5-6 8 7 6 0 v cu5 oc e4 O z 3 Z3 z 21,1 2 W 1 0 0 Expansion Factor for Rectangular Conduits (USDCM, Vol 2 Fig 9-36) 8 = Expansion Angle 7/ _ 5) a O N 0) 11177 o C a• h•O .1 .2 .3 .4 .5 .6 7 .8 TAILWATER DEPTH/ CONDUIT HEIGHT— Yt/H .9 10 Erm• The size of riprap can be found using the following graph after calculating Q/D1.5 and Yt/Dc and reading ▪ the value from Figure 5-7 and Figure 5-8, shown below. Use Figure 5-7 to determine the required rock size for circular conduits and Figure 5-8 for rectangular conduits. Figure 5-7 is valid for Q/D,25of 6.0 or less and Figure 5-8 is valid for Q/WH1.5of 8.0 or less. The �a ▪ parameters n these two figures are: 4rAi �' of Q/D1.5 or Q/WH° 5 in which Q is the design discharge in cfs, D, is the diameter of a circular conduit in feet, and W and H are the width and height of a rectangular conduit in feet. as "� Yt/D, or Yt/H in which Yt is the tailwater depth in feet, D, is the diameter of a circular conduit in feet, and dn: H is the height of a rectangular conduit in feet. In cases where Yt is unknown or a hydraulic jump is suspected downstream of the outlet, use Yt/Dt = Yt/H = 0.40 when using Figure 5-7 and Figure 5-8. N � meY`ti rasm 4844875 Pages: 151 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Wald County , CO firil KM Yak 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 59 Figure 5-7 Riprap Erosion Protection at Circular Conduit (Valid for Q/D2.5<6.0) (USDCM, Vol 2 Figure 9-38) 0 4 0 i 0 4...*".0...0r �Q!'�� F►�'Oi pis .0 Jz• QF. 1 TYPE L D _2 _4 _6 _B 1.! Yt/D Use Da instead of D whenever flow is supercritical in the barrel. ** Use Type L for a distance of 3D downstream. 4944675 Page.: 152 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppes, Clerk and Recorder, Wald County , CO 11111 :dig 14 HMV NINO IF 1 CAI II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 160 Figure 5-8 Riprap Erosion Protection at Rectangular Conduit Outlet (Valid for Q/WH1.5<8.0) (USDCM, Vol 2 Figure 9-39) :? 0P k 17 4 . < • ' 1 mc. APE OO .2 .4 .6 Yt/H .8 1.0 Use Ha instead of H whenever culvert has supercritical flow in the barrel. **Use Type L for a distance of 3H downstream. After selecting the riprap size, the minimum thickness of the riprap layer is defined as: T = 2Dso Table 5-13, below, identifies dso based on riprap classification and gradation. 4644675 Pages: 133 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kappa., Clark and Raoorder, Weld County , CO VIII I��.r�iil'Sw1rM�lff��:�1h►Ii ItiM�+r�r01R Wr�k III III Eq. 5.9.5 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 161 Table 5-13 Classification and Gradation of Ordinary Riprap Riprap Designation % Smaller Than Given Size by Weight Intermediate Rock Dimensions (inches) dw (inches)* Type VL 70-100 50-70 35-50 2-10 12 9 6 2 6" Type L 70-100 50-70 35-50 2-10 15 12 9 3 9" Type M 70-100 50-70 35-50 2-10 21 18 12 4 12" Type H 70-100 50-70 35.50 2-10 30 24 18 6 18 Type VH 70-100 50-70 35-50 2-10 42 33 24 9 24 dye = mean particle size (intermediate dimension) by weight. " Mix VL and L riprap with 30% (by volume) topsoil and bury it with 6+ inches of topsoil, at vibration compacted, and revegetate. 5.10 STORAGE Weld County requires regional and/or on -site detention for all future developments. The County shall be contacted to verify if any existing drainage master plans exist in the area of work. If it is determined that there is an existing master plan for the area of work, the designer shall incorporate that information into the design and ensure that the design follows the drainage requirements set forth in the masterplan. The designer also should keep the following things in mind: • Weld County does not allow detention release rates based on soil types. • Weld County does not allow full spectrum detention to be used in sizing ponds (see Weld County's spreadsheets for storage capacity). 5.10.1 Retention Stormwater retention facilities (stormwater infiltration facilities) normally are not allowed in Weld County but shall be considered for special circumstances with the issuance of a variance. Variance requests shall only be considered in situations where there is a proven hardship on the proposed site. A hardship would be considered where there is not adequate topography to physically drain a pond (sump in basin), refusal of an irrigation ditch to accept additional drainage, or some other physical site constraint. Variances shall be reviewed on a case -by -case basis to determine the validity of the hardship and shall be signed by the Development Review Engineer. Upon the determination that a retention pond is applicable, the volume should be calculated as 1.5 x the developed site runoff for the 100 -year, WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 162 24 -hour storm event plus 1 foot of additional freeboard. An emergency spillway is required for retention ponds. Retention ponds may be sized using the "Modified FAA" tab on the spreadsheet referenced in the "Detention" portion of this document, using a near zero release rate per acre and extending the rainfall duration to 1440 minutes (24 -hours x 60 minutes). The resulting volume at the 1440 -minute interval shall be the value that must be multiplied by 1.5 for the final retention pond volume. A second method for calculating retention pond volume is: Volume = 1.5 x Area x C -Value x Rainfall Area = Site area draining to pond (acres) C -Value = Composite C -Value for area draining to pond (based on soil type and overall, developed impervious percentage for site) Rainfall — NOAA Atlas rainfall depth for site location, 100 -year storm at 24 -hours (in feet, divide NOAA rainfall depth in inches by 12) Volume = Required Volume for Retention Pond in acre -ft The retention pond/infiltration facility shall be designed to meet Colorado Revised Statute 37-92-602 (8) drain time requirements. In order to meet the State Statute requirements, soil infiltration rates may be used to calculate pond drain times. However, soil infiltration rates cannot be used in the overall sizing of the detention/retention ponds. These requirements state that retention facilities: Be solely operated for stormwater management; Be owned and operated by a governmental entity or is subject to oversight by a governmental entity; Continuously releases or infiltrates at least 97 percent of all runoff from a rainfall event that is less than or equal to the 5 -year storm within 72 hours after the end of the event; Continuously releases or infiltrates at least 99 percent of the runoff from a rainfall event that is greater than the 5 -year storm within 120 hours after the end of the event; and Operates passively and does not provide active water treatment processes for the stormwater. 5.10.2 Detention Developments are required to detain the runoff (developed site condition) produced by the 100 -year, 1 - hour storm event with 1 foot of additional freeboard. Pond release rates are based off the calculated undeveloped runoff value for the site. A 2 -percent site imperviousness should be used to calculate the historic runoff rate for pond release values, regardless of site conditions prior to new site improvements. Release rates are calculated using the 5 -year, 1 -hour storm for urbanizing areas and the 10 -year, 1 -hour storm for non -urbanizing areas. Urbanizing areas are defined as areas within one -quarter mile of any municipal boundary, as amended. Non -urbanizing areas are greater than one -quarter mile in distance from a municipal boundary. Municipal boundaries may be found on the County's GIS online mapping website. If the project site is within an urbanizing area or adjacent to a municipal boundary, the governing entity's drainage criteria must be taken into consideration. Weld County requires that the WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (63 more restrictive of the criteria (if municipality is more conservative) must be used in the drainage design of the site. 0 "NI Continuously release or infiltrate at least 99 percent of the runoff from a rainfall event that is -5.... -j greater than the 5 -year storm within 120 hours after the end of the event; and o U Operate passively and do not provide active water treatment processes for the stormwater. in N 8.45E 5.10.2.1 Pond Layout Considerations `O.)1,-, The geometry of a stormwater detention facility depends on specific site conditions such as adjoining t,11. { land uses, topography, geology, preserving or creating wildlife habitat, and volume requirements. -a a Several key features must be incorporated in all detention facilities: v Y a N ; Embankments and side slopes shall have a maximum slope of four feet horizontal to one foot �"vertical (4:1) and shall be stabilized. Slopes steeper than 4:1 in detention basin areas will not be �A aS accepted. rao � t0�"iga The design engineer shall submit all design worksheets for pond designs in the appendices of the drainage report for review. Rainfall data/depths should be site specific and taken from the NOAA Atlas 14, online precipitation frequency data server webpage. A UD-Detention v2.34 worksheet is available on the Weld County Planning and Zoning Development Review webpage. This spreadsheet is an older, archived version of the MHFD's spreadsheet, which utilizes the "Modified FAA" procedure for pond sizing with the County approved C -values. The County DOES NOT accept the full spectrum detention pond design method. The design consultant may use the downloadable spreadsheets or may create their own based on the information provided in this document. If created spreadsheets are utilized, they must comply with the design requirements in this document. Rainfall duration times should be extended until the pond reaches a peak volume, after which the pond volume falls. If the peak is not reached within a reasonable time period (less than two to three hours ±) the volume at the 60 -minute interval may be taken as the required detention volume for the site. If a series of detention ponds are proposed on -site, the County may require a SWMM model be created for the development, so that the pond volumes/water surface elevations can be analyzed as routed ponds. An excerpt from a previous version of USDCM, Volume 2 on the Modified FAA procedure has been provided on the Weld County Planning and Zoning Development Review Webpage, and in Appendix F for reference, if the consultant would like to create their own pond -sizing spreadsheet. The outlet works for detention and water quality facilities shall be designed to meet Colorado Revised Statute 37-92-602 (8), drain time requirements. In order to meet the State Statute requirements, soil infiltration rates may be used to calculate pond drain times. However, soil infiltration rates cannot be used in the overall sizing of the detention/retention ponds. These requirements state that detention facilities: Be solely operated for stormwater management; Be owned and operated by a governmental entity or be subject to oversight by a governmental entity; Continuously release or infiltrate at least 97 percent of all runoff from a rainfall event that is less than or equal to the 5 -year storm within 72 hours after the end of the event; WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 164 Detention basin embankments shall be designed to withstand the 100 -year and larger storm. Poorly compacted native soils shall be excavated and replaced. Embankment soils shall be compacted to at least 95 percent maximum density (Modified Proctor) or as specified in the geotechnical report for the site. Detention basin bottoms shall have a minimum slope of 1 percent for vegetated surfaces. If the desired slope is not attainable, a bottom slope of 0.5 percent may be used with a concrete trickle channel. Water quality and detention flows are released through an outlet structure. The minimum outlet pipe size for use in detention facilities is 12 -inch diameter (or equivalent). Orifice/restrictor plates may be used to reduce flows from the minimum pipe sizes. When possible, place inflow culverts as far from the pond outlet as possible for increased water quality through pond vegetation. Inflow points shall enter the detention basin at or near the toe of the basin to prevent erosion along the basin embankments. If providing an inflow point at the toe of the basin is not feasible, then erosion protection must be provided from the inflow all the way to the toe of the basin. Detention basin bottom must be a minimum of 24 inches above the groundwater elevation. (Groundwater elevation data must be determined during high groundwater months.) Detention basins must be located a minimum of 20 feet away from an irrigation ditch or other facility, or more if specified by the owner of the irrigation canal and protected from seepage from the irrigation canal. Stormwater infiltration facilities shall not be placed in the FEMA mapped floodway and should not be placed in the FEMA mapped 100 -year floodplain. Any berming within the floodplain will require a floodplain study, which may result in the need for a LOMR/CLOMR. 5.10.2.2 Water Quality 8 With drain time requirements in mind, the outlet works for an extended detention basin shall be y designed to release the water quality capture volume (WQCV) over a 40 -hour period. The WQCV may be calculated, along with the orifice hole sized, on the MHFD spreadsheet. An alternate method to U� calculate the required WQCV is to use the equations taken from USDCM, Volume 3 as shown below. NB 1- ."1-2 The WQCV is calculated as a function of imperviousness and BMP drain time using Eq. 5.10.2.1, and as p. o shown in Figure 5-9: 51:• WQCV = a(0.91i3 — 1.19i2 + 0.78i) Eq. 5.10.2.1 Where: WQCV = Water Quality Capture Volume (watershed inches) ors n a = Coefficient corresponding to WQCV drain time (5-) = Imperviousness (%/100) :2.1.1 4944875 Pages: 157 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koopea, Clerk and Recorder, Weld County , CO 11111IY��.rlli�'�Kti i�1Y14Y�i��'�K+�r 4�I�Y�K�� 1114/4/1 III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (65 Figure 5-9 Water Quality Capture Volume (WQCV) Based on BMP Drain Time (USDCM, Vol 3 Fig 3-1) WQGV in Watershed Inches 0.500 0,450 0.400 0.350 0.300 0.250 0.200 0.150 0.100 0.050 0.000 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Total Imperviousness Ratio (i = la/100) Figure 3-1. Water Quality Capture Volume (WQCV) Based on BMP Drain Time 140 h r ur drain time if VPQCV=a(0.9fr'-f. I 124 hour drain time / I9r=+0.78x) � ie 12 -hr drain time a = 0.8 -24-hr drain time a=0.9 40 -hr drain time a = 1,0 r,s f •.• 12 hour drain time Table 5-14 Drain Time Coefficients for WQCV Calculations Drain Time (hrs) Coefficient, a 12 hours 0.8 24 hours 0.9 40 hours 1.0 Weld County does not require the use of trash racks be placed in front of the water quality plate. It shall be at the discretion of the design engineer if trash racks are included. The WQCV is considered a part of the overall detention/retention volume requirement and should not be added to the volume. The water quality orifice plate perforations also may be found using the chart in Table 5-15 only. 4944675 Pages: 158 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Weld County , Co MINI& %WdN :Milk BIM WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 166 Table 5-15 WQCV Outlets Orifice Plate Perforation Sizing Orifice Plate Perforation Sizing Circular Perforation Sizing This table may be used to size perforation in a vertical plate of riser pipe. Hole Dia. (in.) * Hole Dia. (in.) Min. Sc (in.) Area per Row (sq. in.) n =1 n = 2 n = 3 1/4 0.250 1 0.05 0.10 0.15 5/16 0.313 2 0.08 0.16 0.24 3/8 0.375 2 0.11 0.22 0.33 7/16 0.438 2 0.15 0.30 0.45 1/2 0.500 2 0.20 0.40 0.60 9/16 0.563 3 0.25 0.50 0.75 5/8 0.625 3 0.31 0.62 0.93 11/16 0.688 3 0.37 0.74 1.11 3/4 0.750 3 0.44 0.88 1.32 13/16 0.813 3 0.52 1.04 1.56 7/8 0.875 3 0.60 1.20 1.80 15/16 0.938 3 0.69 1.38 2.07 1 1.000 4 0.79 1.58 2.37 11/16 1.063 4 0.89 1.78 2.67 1 1/8 1.125 4 0.99 1.98 2.97 1 3/16 1.188 4 1.11 2.22 3.33 11/4 1.250 4 1.23 2.46 3.69 15/16 1.313 4 1.35 2.70 4.05 1 3/8 1.375 4 1.48 2.96 4.44 17/16 1.438 4 1.62 3.24 4.86 112 1.500 4 1.77 3.54 5.31 19/16 1.563 4 1.92 3.84 5.76 15/8 1.625 4 2.07 4.14 6.21 1 11/16 1.688 4 2.24 4.48 6.72 13/4 1.750 4 2.41 4.82 7.23 113/16 1.813 4 2.58 5.16 7.74 17/8 1.875 4 2.76 5.52 8.28 115/16 1.938 4 2.95 5.90 8.85 2 2.000 4 3.14 6.28 9.42 n = Number of columns of perforations Minimum steel plate thickness 1/4" 5/16" 3/8" * Designer may interfere to the nearest 32"° inch to better match the needed area if desired. Rectangular Perforation sizing Use only one rectangular column whenever two 2;inch diameter circular perforations cannot provide needed outlet area. Rectangular Height = 2 -inches Rectangular Width = Required Area per Row / 2" 4944675 Pages: 159 of 285 02/15/2024 12:24 PM R Fss:$0.00 Carly Kopp., Clark and Recorder, Weld County , CO VIII INVISIL,MillediiitilliNallAVICAIlk 111111 Rectangular hole Width Min. Steel Thickness 5" 6" 7" 8" 9" 10" 1/4 1/4 " 5/32 " 5/16 " 11/32 " 3/8 " 12" > 10" WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 167 5.10.2.3 Outlet Structure Included below is a typical configuration for a detention pond outlet structure. The detail shows the general features and layout of the basic components of a typical outlet structure. Figure 5-10 is not a construction detail. The design engineer will be required to design the outlet structure to meet the needs of the individual site plan and topography. In addition, the following items must be included in the outlet structure design: The outlet pipe must contain a minimum of two concrete cutoff walls embedded a minimum of 18 inches into undisturbed earthen soil. The cutoff walls must be a minimum of 8 inches thick. The outlet pipe bedding material must consist of native earthen soil, not granular bedding to at least the first downstream manhole or daylight point. A water quality plate designed to release the WQCV in 40 -hours attached to the front of the structure. Plate should be a tight fit with no gaps. Gasket or seal could help facilitate this fit. A restrictor plate attached to the back wall of the structure to limit the pond release to the calculated 5 -year or 10 -year historic runoff rate for the site (see detention pond section for details). The outlet pipe must be a minimum diameter of 12 -inches. To reduce maintenance and avoid operational problems, outlet structures must be designed with no moving parts other than the trash rack (i.e. use only pipes, orifices, and weirs). Manually and/or electrically operated gates shall be avoided. To reduce maintenance, outlets should be designed with openings as large as possible, compatible with the depth -discharge relationships desired and with water quality, safety, and aesthetic objectives in mind. • Outlets should be robustly designed to lessen the chances of damage from debris or vandalism. 2 Avoid the use of thin steel plates as sharp -crested weirs to help prevent potential accidents, 8-$ especially with children. Trash racks must be provided on all outlet structures. 4944675 Pages: 160 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopp., Clerk and Raoordar, Wald County , CO IIIIIIMPJIIIIPPAgIVIII:ditlaidiaLleiNfliNik BIM WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 168 Figure 5-10 Outlet Structure Plan and Profile Example OUTLET REQUIREMENTS OUTLET STRUCTURE WQCV SHALL BE RELEASED OVER 40 HOURS OUTLET WORKS SHOULD BE SIZED AND STRUCTURALLY DESIGNED TO RELEASE AT NO MORE THAN THE 1 -HOUR, 5 -YEAR HISTORIC RELEASE RATE IN URBANIZING AREAS AND THE 1 -HOUR, 10 -YEAR HISTORIC RELEASE RATE IN NON -URBANIZING AREAS. OPENINGS IN THE SAFETY GRATE SHALL ALLOW ENOUGH FLOW TO PASS THE 5 -YEAR OR 10 -YEAR HISTORIC FLOW (DEPENDENT ON URBANIZATION CLASSIFICATION), USING A 50% CLOGGING FACTOR. STEEL FOR GRATES AND GRATE INSTALLATION HARDWARE SHALL BE GALVANIZED AND CONSTRUCTED IN ACCORDANCE WITH CDOT SECTION 712.06. CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS, PER CDOT SPECIFICATION SECTION 601. REINFORCEMENT BARS SHALL BE PER COOT SPECIFICATIONS. SPACING AND SIZE TO BE DETERMINED BY CONSULTING DESIGN ENGINEER. - STEPS SHALL BE PROVIDED WHEN HEIGHT IS GREATER THAN 3'-6- AND SHALL CONFORM TO AASHTO M 199. SAFETY GRATE m OUTLET PIPE 12- MIN. PLAN VIEW RESTRICTOR ORIFICE PLATE WATER QUALITY PLATE A' SECTION B -B' 5.10.2.4 Stage Storage Curves A relationship between the water surface elevation and detention basin volume, commonly referred to as a "stage -storage" curve, needs to be developed for each pond. The afore mentioned MHFD spreadsheet will calculate a stage -storage table based on overall pond dimensions, however the County WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 169 requires the stage -storage volumes be based on the actual site design contours. The volumes may be calculated in the "Basin" tab of the spreadsheet by using the "Surface Area at Stage (ft2) override" column or by using the equation below. Another method of calculating the stage -storage volume is called the "Conic" method and is based on the following formula: V=(A+B+ AB) Eq.5.10.2.2 .Y Where: V= Volume between two contours, ft3 D= Depth between contours, feet 24:01 A= Area of bottom contour, ft2 B= Area of top contour, ft2 14."11• "A cumulative volume should be provided for the progressing stages/depth of the pond. The required pond volume for water quality and detention should be compared to the available pond volume provided in the design. The information should be clearly shown in the project's drainage report. 5.10.2.5 Spillway Detention ponds and stormwater infiltration facilities (retention ponds) shall contain an emergency spillway capable of conveying the peak 100 -year storm discharge (from developed site) draining into the r.0,• ,m pond/infiltration facility. The spillway also should be capable of passing any off -site flows that are routed w.;;= through the pond un-detained. The spillway location should be placed so that downstream properties or residences are not adversely affected. The invert of the emergency spillway must be equal to or above the 100 -year WSEL. The elevation of the top of the embankment should be a minimum of 1 foot above the water surface elevation when the emergency spillway is conveying the maximum design or ▪ emergency flow. The depth of flow over the emergency spillway shall be 6 inches or less. Additional ▪ spillway details are shown in Appendix J. Flow over a horizontal spillway can be calculated using the following equation for a horizontal broad- ,, crested weir, shown below. Q = CB,LH1.5 Eq. 5.10.2.3 Ns'•3� Where: Q= Discharge, cfs = Broad -crested weir coefficient, dimensionless (ranges from 2.6 to 3.0) as § L= Length of weir, ft H= Head above weir crest, ft NU '" In addition, the County requires the following items be included in the spillway design. mNYiEj • A concrete cutoff wall 8 inches thick, 3 feet deep, and extending a minimum of 5 feet into the embankment on each side of the emergency spillway opening is required on all privately maintained detention ponds/infiltration facilities and regional detention ponds/infiltration WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 170 facilities. The concrete cutoff wall permanently defines the emergency spillway opening. The emergency spillway elevation shall be tied back into the top of the embankment using a maximum slope of 4:1. To protect the emergency spillway from catastrophic erosion failure, riprap shall be placed from the emergency spillway downhill to the embankment toe of slope, with a toe -down constructed to a depth of 4xD5o. The minimum D50 for riprap on the emergency spillway shall be 12 inches (Type M). Riprap may be either grouted or buried. If buried, the protected area shall be covered with 6 inches of topsoil and seeded. Revegetation requirements for storage facilities can be found in Chapter 8 of this WCECC. S detail of the preferred spillway design is in Figure 5-11 below. Figure 5-11 Emergency Spillway Typical Design EMERGENCY SPILLWAY • 2 o � U PizC Z � J 3 W -p AFL p. N o tO�Y' 01N`- FRONT VIEW SIDE VIEW EMERGENCY SPILLWAY REQUIREMENTS - EACH DETENTION POND SHALL CONTAIN AN EMERGENCY SPILLWAY CAPABLE OF CONVEYING THE PEAK 100 -YEAR STORM AT A DEPTH OF SIX (8) INCHES OR LESS. BURIED OR GROUTED RIPRAP SHALL BE PLACED FORM THE EMERGENCY SPILLWAY DOWNHILL TO THE EMBANKMENT TOE OF SLOPE AND COVERED WITH SIX (6) INCHES OF TOPSOIL, IF BURIED. THE RIPRAP MUST BE SIZED AT THE TIME OF FINAL ENGINEERING DESIGN. GROUTING OF THE RIPRAP MAY BE REQUIRED. - IN ORDER TO PREVENT DAMAGE TO PUBLICLY -OWNED INFRASTRUCTURE (ROADS, ROADSIDE DITCHES), A CONCRETE CUTOFF WALL EIGHT (8) INCHES THICK. THREE {3) FEET DEEP, AND EXTENDING A MINIMUM OF FNE (5) FEET INTO THE EMBANKMENT ON EACH SIDE OF THE SPILLWAY OPENING IS REWIRED ON ALL DETENTION PONDS. THE EMERGENCY SPILLWAY ELEVATION MUST BE TIED BACK INTO THE TOP OF THE EMBANKMENT USING MAXIMUM SLOPE OF 4'1. - CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS. PER COOT SPECIFICATION SECTION 801. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 171 5.10.2.6 Maintenance Maintenance for stormwater storage facilities should follow the recommendations in the USDCM, Volume 3, unless otherwise specified by the design engineer. It is recommended that stormwater infiltration facilities be scraped/plowed every few years to prevent sedimentation and/or clogging and to ensure proper infiltration is being achieved. Areas designated for stormwater drainage, detention, or stormwater infiltration, are not to be used for materials storage, building, or parking, and should not be modified without approval from the Department of Public Works. Access also must be provided to the drainage facilities for long-term maintenance. Refer to Section 5.3.1 of this WCECC for O&M submittal requirements. 5.10.2.7 Exceptions to Detention Requirements Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property. The following exceptions are provided in Chapter 8, Article XI, of the Weld County Code and are subject to updates: Use by right or accessory use in the A (Agricultural) Zone District Zoning permits for accessory storage, commercial vehicles, home occupations, or manufactured homes in the A (Agricultural) Zone District • A second dwelling permit in the A (Agricultural) Zone District • Towers, including but not limited to wind and telecommunication towers • Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances Gravel pits, if the stormwater drains into the gravel pit. Releases from the site shall comply with this Engineering and Construction Criteria Manual, including dewatering. Topographical information will be provided. Rural residential developments with no historic flooding, where all the following conditions exist. This exception shall be supported by calculations provided by the Applicant. Additional information may be requested and will be signed and stamped by a Colorado licensed Professional Engineer: a. Nine (9) lots or fewer. b. The minimum lot size is equal to, or greater than, three (3) acres per lot. c. The total post -development imperviousness for the rural residential development does not exceed ten percent (10%), assuming that all internal roads and driveways are paved. Development of sites where the change of use does not increase the imperviousness of the site. Note: This exception cannot be applied to sites where impervious surfaces were added for, or in conjunction with, a business that is/was operating in violation and/or without the required Weld County land use permit. A parcel of land or project site where the "total developed stormwater runoff" from the 100 - year, 1 -hour storm is less than, or equal to, five (5) cfs. The "total developed stormwater runoff" includes cumulative runoff from the proposed project site plus runoff from any previously developed project site on the subject parcel. A project site is the area of land that lies within the project's limits of disturbance during construction. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer. In -fill development parcels with total area less than, or equal to, one (1.0) gross acre. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 172 An individual parcel with an unobstructed flow path and no other parcel(s) between the channel within a Federal Emergency Management Administration (FEMA) regulatory floodplain and the project. A parcel greater than one (1) gross acre and less than, or equal to, five (5) gross acres in size is allowed a one-time exception for a new four thousand (4,000) sq. ft. building or equivalent imperviousness. A parcel > 5 gross acres in size is allowed a one-time exception for a new 4,500 sq. ft. of 100% impervious area or equivalent imperviousness. A parcel greater than five (5) gross acres in size is allowed a one-time exception for a new nine thousand (9,000) sq. ft. of 100% imperviousness area or equivalent imperviousness. Concentrated Animal Feeding Operations (CAFOs), Animal Feeding Operations (AFOs), and Housed Commercial Swine Feeding Operations (HCSFOs) which are covered and approved by the Colorado Discharge Permit System (CDPS) regulations. Portions of the site not included or covered by the CDPS permit shall comply with the criteria set forth in this Chapter. Exception requests shall be supported with an approved drainage narrative, which must describe the following minimum criteria: • The exception being requested for consideration. • Any existing and proposed improvements to the property. • Where the water originates if it flows onto the property from an offsite source. • Where the water flows as it leaves the property. The direction of flow across the property. Previous drainage problems with the property, if any. The location of any irrigation facilities adjacent to or near the property. Any additional information pertinent to the development. During the review of the application, the Weld County Department of Planning and Zoning will determine if the exception is applicable and will not jeopardize the health, safety, and welfare of public and private property. 5.10.3 Dam Information All detention ponds shall be evaluated to verify if the detention facility would be classified as a non - jurisdictional or jurisdictional dam, per the State of Colorado Department of Natural Resources criteria. Refer to Table 5-16. Table 5-16 Non -Jurisdictional vs Jurisdictional Dam Criteria Summary Non -Jurisdictional Dam Jurisdictional Dam Jurisdictional Height of Berm < 10 ft > 10 ft Water Storage Area (at High Water Line) < 20 ac > 20 ac Water Storage Volume < 100 ac -ft > 100 ac -ft *This table is a general summary of the required State Criteria. The Designer shall be required to determine which category their design would be classified as and determine the required protocol. This information will then be supplied to the County for record keeping purposes. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 173 If it is determined that the detention facility is classified as a jurisdictional dam, state procedures must be followed. It should be noted that non -jurisdictional -size dams are regulated and subject to the authority of the State Engineer consistent with Sections 37-87-012 and 37-87-105 C.R.S., Implementation of detention ponds, and will require the design engineer to consult with the State Engineer's Office to verify the legal right to store water. 5.10.4 Irrigation Ditches/Private Irrigation Systems It is not the intent to allow new private irrigation systems to be located within County right-of-way. Irrigation ditches shall not be used as conveyance systems and/or outfall points for stormwater runoff for all land use cases including, but not limited to: Uses by Special Review, Site Plan Reviews, Subdivisions, or Planned Unit Developments, unless such use is approved, in writing, by the ditch owner(s). The approval shall be in the form of signature on the construction plans/documents or other formal legal agreements as required by the ditch company or owner. Should direct discharge of stormwater runoff be permitted, water quality treatment may still be required. In the instance where an irrigation ditch serves as the outfall for a stormwater detention facility, the following items must be met: The maximum water surface elevation must be determined based on the maximum amount of irrigation flow in the ditch. The appropriate owner/ditch or reservoir company is the determining authority regarding the maximum irrigation flow in the ditch. Written verification of the maximum irrigation flow from the owner/ditch or reservoir company must be submitted with the hydraulic analysis of the ditch water surface elevation. The detention outlet must be designed such that backflow from the ditch into the detention facility is prevented. The backwater effects caused by the design of a detention outlet, if any, must be reviewed and approved by both the County and the appropriate ditch or reservoir company. The outlet design must consider tailwater effects on the outlet pipe resulting from the combination of the maximum irrigation flow and the 100 -year storm discharge within the ditch. Drain times need to adhere to Colorado Revised Statute 37-92-602 (8) drain time requirements as listed in the "Detention Pond" section of this document. If new developments are adjacent to irrigation facilities but no flows are being directed into the ditch, the owner/ ditch or reservoir company must still be notified of the proposed development. In such cases, it shall be the developer's engineer responsibility to provide drawings and calculations to support the fact the irrigation ditch is not impacted. These drawings and calculation shall be supplied to the County and ditch company owner. The party seeking modifications to existing ditch conditions must obtain the appropriate owner / ditch or reservoir company approvals and signatures prior to seeking Weld County approval for such modifications. The party seeking modifications to the existing irrigation facilities must coordinate with the irrigation system owner/operator to provide an adequate design to make the irrigation system function as it did prior to the improvements. When modifications to existing irrigation systems are necessary, the following must be provided to the County review staff: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 174 Information on how the existing private irrigation facilities are to be protected or routed through the project site. Plan and profile drawings of any new irrigation pipes should be included in the drawing set, similar to information for proposed storm lines. A hydraulic model showing the irrigation pipe system at full irrigation flows should be provided in the drainage report for review by County staff. Irrigation flows should be provided by the owner of the irrigation system, not estimated on existing pipe or ditch sizes. Details of any irrigation structures required should be provided in the plan set for the development. Dimensions of the structures, concrete type and thickness, rebar type and spacing, grates, weir boards, bridge, trash racks, connecting hardware, air vents etc. should be included in the details of the irrigation structures. Owner approval of the new system is required before construction can proceed. Proposed private irrigation facilities for new developments or reconfigured existing irrigation systems should be located outside of the public right-of-way. As -built survey is required documenting all changes in direction and structure critical elements plus video of all pipes installed verifying pipe connections and debris removal. 5.11 STORMWATER DRAINAGE CRITERIA VARIANCES In cases of hardship, an applicant may apply for a variance from a requirement of the storm drainage criteria. Weld County will not approve design variances found to be detrimental to the public health, safety, and general welfare or when the request is contrary to the purpose and intent of the criteria set forth in this document or the Weld County Code. The variance procedure is intended to address cases of hardship, and requests will not be granted when the hardship is brought about solely through the actions of the appellant. Variance requests shall be stamped and signed by a professional civil engineer licensed to practice in the State of Colorado and shall be submitted with the Certificate of Compliance. Variance requests will be reviewed by the Development Review Engineer. To be reviewed, the variance request must: State the hardship that is causing the request for a variance from Weld County Code. Provide proof of the hardship in the drainage memo/letter provided. Describe the design criteria of the Weld County Code from which a variance is being requested. Describe the proposed alternative with engineering rationale that supports the intent of the Weld County Code. Meet the design intent of the Weld County Code. Demonstrate that granting of the variance will still adequately protect public health, safety, and general welfare. Demonstrate there are no adverse impacts from stormwater runoff to the public rights of way and/or offsite properties as a result of the project. Applicants may appeal the denial of a variance to the BOCC pursuant to the provisions in Chapter 2, Article IV, Section 2-4-10 of the Weld County Code. Variance requests, if accepted, are not precedent setting and are based on site -specific constraints. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 175 5.12 OIL AND GAS STORMWATER MANAGEMENT The following standards apply only to the development of oil and gas exploration and production in the Weld Mineral Resource (Oil and Gas) Area. These standards shall be supported by calculations signed and stamped by a Colorado licensed Professional Engineer and accepted by the Weld County Department of Public Works. See also Chapter 21 of the Weld County Code. Oil and Gas Tank battery secondary containment. When calculating the Oil and Gas Location imperviousness and pervious areas, secondary containment areas may be excluded from the total site imperviousness and pervious calculations provided that the secondary containment area is appropriately sized to hold the originally designed safety containment volumes plus the 100 -year, 1 -hour storm rainfall event. Detention pond storage volume. In non -urbanizing areas during the Construction Phase, detention ponds shall be sized to store the stormwater runoff generated by the 1 -hour, 100 - year storm falling on the developed site and release of the detained water at the historic runoff rate of the 1 -hour, 10- year storm falling on the undeveloped site or at 5 cfs, whichever is greater. Historic is defined as an undeveloped site (before any development) with an assumed 2.0 percent imperviousness maximum. During the Production Phase or in urbanizing areas, detention ponds shall adhere to Sec. 8-11-100.A.1. of the Weld County Code. Detention pond freeboard. During the Construction Phase, less than 1 foot of freeboard may be allowed on a case -by -case basis. This exception shall be supported by calculations signed and stamped by a Colorado licensed Professional Engineer and accepted by the Weld County Department of Public Works. During the Production Phase, the detention pond shall adhere to Sec. 8-11-100.A.4 of the Weld County Code. Emergency spillway. To prevent damage to publicly owned infrastructure (roads, roadside ditches), a cutoff wall is required on all privately maintained detention ponds and retention ponds. The cutoff wall permanently defines the emergency spillway opening. The emergency spillway elevation must be tied back into the top of the embankment using a maximum slope of 4:1. The cutoff wall must either be constructed of concrete or galvanized steel sheet pile. Concrete cutoff walls must adhere to Sec. 8-11-100.A.7 of the Weld County Code. Steel sheet pile cutoff walls must be hot dipped galvanized steel of1A-inch thickness or 3 -gauge and extend 3 feet below the bottom of the pond or per manufacturer's recommendation, whichever is greater. If steel sheet pile is proposed for the cutoff wall, the native soils must be tested for sulfate levels. If the sulfate levels are above 1.0 percent, the sheet pile shall be coated with a corrosion -resistant epoxy. Retention pond. Retention facilities shall be allowed without a variance only during the Construction Phase. Retention facilities that are proposed for the Production Phase require the issuance of a variance requested by the Applicant and accepted by the Weld County Department of Public Works. Additionally, as part of the application for a 1041 WOGLA Permit, an Operator shall provide proof of a valid stormwater discharge permit issued by CDPHE. The Operator shall submit a drainage report to comply with required Storm Drainage Criteria pursuant to Chapter 8, Article XI of the Weld County Code. Additional requirements for Municipal Separate Storm Sewer System (MS4) areas may be applicable pursuant to Chapter 8, Article IX of the Weld County codr 4947669 Pages: 168 of 283 03/05/2024 11:15 All R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 176 CHAPTER 6 GRADING AND MS4 REQUIREMENTS 6.1 EROSION CONTROL AND GRADING REQUIREMENTS Weld County requires an erosion control and grading plan. Erosion control methods are implemented to prevent the offsite transport of sediment from land- disturbing activities. Erosion has the potential to damage adjacent properties and County drainage systems, as well as contributing to the degradation of water quality. When properly installed and maintained, temporary control measures provide effective erosion control for a site. At a minimum, a stormwater management plan (SWMP) shall include erosion control and grading plans. 6.1.1 Applicability Sites disturbing more than one acre (Sec. 8-12-30.B) of land disturbance require a Grading Permit. For MS4 areas a grading permit may be required for any disturbance. The definition of disturbance in the Weld County Code is when the surface area is disturbed by any work activity upon the property by means including, but not limited to, grading; excavating; stockpiling soil, fill, or other materials; clearing; vegetation removal; removal or deposit of any rock, soil, or other materials; or other activities that expose soil. Disturbed area does not include the tillage of land that is zoned agricultural or the tillage of a parcel zoned PUD (planned unit development) within the area identified for agricultural uses. For Grading Permit exemptions, refer to Section 8-12-30 of the Weld County Code. 6.1.2 Grading and Erosion Control Plans When applying for a Grading Permit, a Grading Plan, a Utility Map (Sec. 8-12-50.C), a Drainage Plan and a Sediment & Erosion Control Plan shall be submitted for review. A Grading Permit Checklist, provided in Appendix G, should be used for guidance in developing the Grading Plan and Sediment & Erosion Control Plan to expedite the review process. The main components of the Grading Plan and Sediment & Erosion Control Plan are: 1. Site Drainage —identifying existing and proposed grading and drainage features (swales, inlets, manholes, curb and gutter, concrete pans, culverts, roof drains, ponds, and outlet structures) designed to convey stormwater runoff. Site grading will be consistent with accepted Drainage Plan for the site. 2. Temporary Control Measures (BMPs)—identifying, detailing, and locating all structural and non- structural temporary control measures used during each phase of construction, from initial disturbance to final stabilization, to prevent the discharge of sediment from the site. Additionally, the plan will include installation, implementation, maintenance, and removal specifications for each structural control measure and a narrative description of each non- structural control measure. 3. Permanent Stabilization —identifying the means and methods used to achieve stabilization for all disturbed areas. Stabilization includes, but is not limited to; seed mix, seed application method, mulch type, mulch application method, soil testing, soil amendments, and erosion control blankets. Additionally, the plan will include installation, implementation, and maintenance specifications for each structural control measure and a narrative description of each non-structural control measure. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 177 A complete set of plans will include separate plan sheets for all three phases of construction identified as follows: 1. Initial Phase —depicting current site conditions, including existing structures, drainage patterns, topography, etc. 2. Interim Phase —depicting temporary control measures used during active construction. Depending on construction phasing, multiple sheets may be required. At a minimum, vehicle tracking, perimeter control and inlet/outlet protection will be addressed with temporary control measures. In addition, the plans should note that a state -issued Dewatering Permit will be obtained and submitted to Weld County prior to any dewatering activities. 3. Final Phase —depicting temporary control measures to remain in place after construction until the site reaches final stabilization. Final stabilization is when all landscaping is complete, and seeding has reached at least 70 percent permanent vegetative cover. At a minimum, perimeter control will remain in place and maintained until final stabilization is reached. In addition, other temporary control measures may be required to remain in place and maintained, if necessary, to prevent offsite sediment transport while waiting for vegetative growth. Plan sheets will be submitted electronically and should be clear and legible. The Development Review Engineer reserves the right to require plan modifications for readability purposes. In addition, each temporary control measure used will be located on the applicable site plan and referenced in the legend, and an installation and implementation specification will be attached. Public Works recommends using USDCM Volume 3, Chapter 7, Construction BMPs, for clear and specific installation and implementation specifications. Other methods may be approved on a case -by -case basis. 6.1.3 Implementation During construction, the Grading Plan, Utility Map, Drainage Plan and Sediment & Erosion Control Plan shall be kept onsite and available for reference by site workers and County inspectors. In accordance with the state- issued Construction Permit, temporary control measures should be inspected by a Qualified Stormwater Manager at a minimum of every two weeks and after storm runoff events; however, more frequent inspections may be necessary to properly maintain temporary control measures. If changes to the approved Grading Plan and Erosion & Sediment Control Plan are necessary, Weld County shall be contacted to determine if a Grading Permit modification is necessary. Weld County inspectors shall verify site conditions with the approved set of plans. Violations may occur if site conditions do not reflect the approved plans. 6.1.4 Grading Permit Deadline & Extension Grading permits are a construction permit and are good for a 12 -month period from issuance. Final permit closeout requires a minimum of 70% vegetative cover over the disturbed area. If construction is not complete and/or vegetative cover is not established prior to the one-year expiration date an extension to the permit will be required. A permit extension fee may be required if the applicant has not established substantial or final completion as determined by County staff inspections of the site. Substantial completion, at the sole discretion of the County, could be granted if the construction timeline did not provide the opportunity for the site to get through an entire and proper growing season. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 178 6.1.5 Tracking Control Tracking control is required when construction activity is accessing onto a roadway surface other than gravel. There are three tracking control options when required to mitigate impacts to the public road, including damages and/or offsite tracking of mud or other materials. Regardless of option, drainage and/or culverts must be maintained. The associated appropriate tracking control devices for each situation are listed below. Permanent access onto concrete, asphalt, or recycled asphalt (RAP) public road a. Double cattle guards used in combination with 100 feet of asphalt b. Or 300 feet of asphalt Permanent access onto gravel public road a. Double cattle guards with 100 feet of aggregate surface course (See Section 9.6.6) b. Or 300 feet of aggregate surface course (See Section 9.6.6) c. Aggregate surface course (See Section 9.6.6) on all drive surfaces Temporary access onto either concrete, asphalt, or recycled asphalt (RAP) or gravel public road. Culverts or accepted drainage report may be required for temporary access control pads. a. County accepted prefabricated tracking pad b. Aggregate with base and a minimum of 70 feet long (per Error! Reference source not found.6-1) 4944675 Pagss: 171 of 285 02/10/2024 12:24 PM R Fse:$0.00 Carly Kopp., Clark and Recorder, Wald County , CO lIII ti'hf� iP 1 N ,�l %11440alukkIl t l /Ili tii 11111 WELD COUNTY ENGINEERING 8, CONSTRUCTION CRITERIA PAGE (79 Figure 6-1 Tracking Control for Temporary Accesses PLAN VIEW 10' EXISTING GROUND 7, MIN. ELEVATION SECTION OR EQUIVALENT SECTION B -B NOTES: 1. AGGREGATE SHALL CONFORM TO COOT SPECIFICATIONS. SUBSECTION 208 2. THE CONTRACTOR SHALL PROTECT CURB AND GUTTER, EDGE OF PAVEME OF GRAVEL ROAD THAT CROSSES OR IS ADAJACENT TO THE ENTRANCE F1, WHILE NOT BLOCKING FLOW OF WATER, IN THE CASE THERE IS AN EXISTING CULVERT IS REQUIRED PROTECTION OF THE ADJACENT ROADWAY MATERIAL' ABOVE SHALL BE INCLUDED IN THE COST OF THE WORK AND NOT PAID FO1 3. ALL MATERIALS AND LABOR TO COMPLETE THE VEHICLE TRACKING PAD INCLUDED IN THE COST OF THE WORK AND NOT PAID FOR SEPARATELY. 4. THE PAY ITEM NUMBER FOR VEHICLE TRACKING PAD (EACH) IS CDOT ST SPECIFICATION 208-00070. 4844675 Pages: 172 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Wald County , CO IIII PAMtMINI11:1144)11.0IItWIll PIrdDliliki III II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 180 6.2 MS4 REQUIREMENTS Sites located in Weld County's state -permitted Municipal Separate Storm Sewer System (MS4) area are required to comply with the Grading Permit requirements as well as additional MS4 requirements. Weld County is categorized as Phase II. An MS4 is a conveyance or system of conveyances that is: • Owned by a state, county, city, town, or other public entity that discharges to waters of the United States • Designed or used to collect or convey stormwater (including storm drains, pipes, ditches, etc.) • Not a combined sewer • Not part of a publicly owned treatment works (sewage treatment plant) EPA's Stormwater Phase II Rule established a management program that is intended to reduce the quantity of pollutants that enter MS4s from stormwater. Common pollutants include oil and grease from roadways, pesticides and fertilizers, sediment from construction sites, and discarded trash. When deposited into nearby waterways through MS4 discharges, these pollutants can impair the waterways, discourage recreational use, contaminate water supplies, and interfere with the habitat for aquatic organisms, fish, and wildlife. In compliance with the provisions of the Federal Water Pollution Control Act (commonly referred to as the Clean Water Act), as amended (33 USC 1251 et seq.), the EPA promulgated rules establishing Phase I of the NPDES stormwater program in 1990. The 1990 Phase I program requires operators of medium and large MS4s (defined as those serving populations of 100,000 or greater) to implement a stormwater management program to control pollution. State law has similar provisions (Colorado Water Quality Control Act, CRS 25-8-101 et seq). The 1999 Stormwater Phase II Rule extended coverage of the NPDES stormwater program to certain "small" MS4s in urbanized areas (those serving populations of 10,000 to 100,000). Small MS4s located in urbanized areas are defined by the Census Bureau based on the most recent Census. New urbanized areas will be identified in each subsequent Census, occurring every 10 years. Generally, Phase I MS4s are covered by individual permits, and Phase II MS4s are covered by a general permit. Each regulated MS4 is required to develop and implement a program to reduce the contamination of stormwater runoff and prohibit illicit discharges. Operators of small MS4s are required to design their programs to reduce the discharge of pollutants to the "maximum extent practicable." In Colorado, the program is administered by the Colorado Department of Public Health & Environment (CDPHE) Water Quality Control Division. (The Colorado program is referred to as the Colorado Discharge Permit System, or CDPS, instead of NPDES.) 6.2.1 Designated MS4 Areas and Responsibilities The MS4 mapped areas are reviewed annually by Weld County and are designated by CDPHE based on population density. Currently, MS4 municipalities in Weld County include Greeley, Evans, Windsor, Firestone, Erie, LaSalle, Brighton, Longmont, and a small portion of Northglenn and Thornton. As Weld County continues to grow in population, each of these MS4 areas will continue to expand, potentially encompassing urbanized parts of Frederick and Dacono. The MS4 permit requires the County to implement a Construction Sites Program to prevent the discharge of pollutants to the MS4 from applicable construction activities. The MS4 permit also requires WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (81 a Post -Construction Program to treat stormwater runoff from applicable development sites. These responsibilities are handled through coordination between the departments of Planning and Public Works. 6.2.2 Applicability of MS4 Requirements The MS4 Permit mandates specific requirements for construction activities resulting in a land disturbance of greater than or equal to one (1) acre. The same requirements apply to land disturbance that is less than one (1) acre but is part of a larger common plan of development or sale with a planned disturbance of greater than or equal to one acre. For subdivisions, planned disturbance is equal to the cumulative potential development area as specified by Chapter 23 of the Weld County Code and/or the Master Drainage Plan for the subdivision, if more restrictive. The MS4 Permit defines construction activity as ground -surface -disturbing activity, which includes, but is not limited to, clearing; grading; excavation; demolition; and installation of new or improved haul roads, access roads, staging areas, stockpiling of fill materials, and borrow areas. Activities that include routine maintenance to maintain original line and grade, hydraulic capacity, or original purpose of the facility are not considered construction activities. Activities to conduct repairs that are not part of regular maintenance and activities that are for replacement are considered construction activities and are not considered routine maintenance. Repaving activities where underlying or surrounding soil is cleared, graded, or excavated as part of the repaving operation are construction activities unless they are an excluded site under Part I.E.4.a.i. of the permit. 6.2.3 Required Permits 6.2.3.1 CDPS Construction Stormwater Permit When construction activities result in land disturbance of one (1) acre or more, or less than one acre but part of a larger common plan of development, the owner and operator must obtain a CDPS Construction Stormwater Permit, issued by CDPHE, prior to the start of land- disturbing activities. Under certain conditions, an R -Factor waiver may be obtained from CDPHE. As part of the permit, a Stormwater Management Plan (SWMP) must be kept onsite at all times. Additionally, the site must have a Qualified Stormwater Manager (QSM), a person knowledgeable about stormwater requirements and capable of implementing the SWMP in its entirety. Refer to the CDPHE website for more information on the CDPS Construction Stormwater Permit, R - Factor Waiver, and a SWMP preparation guidance document. 6.2.3.2 CDPS Construction Dewatering Permit When construction activities require dewatering, the owner and operator must obtain a CDPS Construction Dewatering Permit, issued by CDPHE, prior to the start of dewatering activities. Under certain conditions, as specified in CDPHE's Low Risk Discharge Guidance for Discharges of Uncontaminated Groundwater to Land, a dewatering permit may not be required. However, if the dewatering activity is not complying with the guidance document and/or there is a threatened discharge of pollutants to the MS4, the Department of Public Works will issue a Stop Work Order until a CDPS Construction Dewatering Permit is obtained and the threatened discharge no longer exists. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 182 Refer to the CDPHE website for more information on the CDPS Construction Dewatering Permit and CDPHE's Low Risk Discharge Guidance for Discharges of Uncontaminated CDPHE's Low Risk Discharge Guidance for Discharges of Uncontaminated Groundwater to Land. 6.2.3.3 Weld County Grading Permit When construction activities will result in land disturbance of one acre or more, or less than one acre but part of a larger common plan of development, the owner or operator must obtain a Grading Permit, issued by Weld County, prior to the start of land -disturbing activities. In some cases, when disturbing less than one acre within a developing subdivision, a Grading Permit may be required depending on other construction activities in the area. Additionally, a Grading Permit may be required for sites not located within the MS4 area but discharge into an MS4 drainage system. Exemptions to the Grading Permit do not apply to properties located within the MS4 area, and variances to MS4 requirements will not be granted. 6.2.4 MS4 Requirements for Pre -Construction The following requirements apply to any applicable development or construction activity within the MS4 area. This includes the resubdivision of land since it is considered a "larger common plan of development." The Department of Public Works will review each case and determine the applicability of the site and if any exclusions are approved (see Post -Construction exclusions below). 6.2.4.1 Site Plan Review The following documents shall be submitted, reviewed, and accepted by Weld County staff prior to any applicable construction activity requiring a Grading Permit. In addition, construction activity not requiring a Grading Permit may be required to submit applicable documents if determined necessary to comply with MS4 requirements. 6.2.4.2 Drainage Report Drainage Reports shall be signed and stamped by a Colorado licensed Professional Engineer. A Drainage Report Checklist, provided in Appendix B, should be completed and submitted with the report. The four main components of the Drainage Report relating to MS4 requirements are: a. General Content —describing the nature of the development, basic characteristics of the site, and proposed drainage improvements designed to comply with Weld County drainage and MS4 requirements. This includes specifying the MS4 "Base Design Standard" used in the design of the permanent water quality control measure. b. Hydrology and Hydraulic Analysis —including the calculations, narratives, and design details for permanent structural control measures and associated drainage features to show compliance with the MS4 Permit's "Base Design Standards." c. Construction Drawings —detailing the existing and proposed drainage, permanent water quality control measure(s) to be installed, and specifications for structural components. d. Long -Term Operations and Maintenance Plan —for permanent water quality control measures and associated drainage features. The plan shall include frequencies of inspections and maintenance and narratives for non-structural control measures, if applicable. Refer to USDCM Volume 3 Chapter 6 for guidance on maintaining permanent water quality control measures. WELD COUNTY ENGINEERING 8L CONSTRUCTION CRITERIA PAGE (83 When designing a permanent water quality control measure and developing maintenance procedures, Public Works will conduct routine inspections for the life of the control measure to ensure proper functioning and adequate maintenance is being performed. Inspections generally occur every year; however, some sites may qualify for inspections every five years based on factors such as the control measure type/design, facility type, pollutant load, and historical compliance. If there are no structural components to visually confirm volume capacity, such as a concrete trickle channel, micro -pool, or forebay, a survey conducted by a Professional Land Surveyor may be required. Additionally, a Colorado licensed Professional Engineer shall provide confirmation of the existing volume capacity meeting the approved Drainage Report calculations. The survey and report may be required to be submitted every five years for the life of the facility. 6.2.4.3 Grading and Sediment & Erosion Control Plans Grading and Sediment & Erosion Control Plans shall be signed and stamped by a Colorado licensed Professional Engineer. A Grading Permit Checklist, provided in Appendix G, should be used in developing plans to expedite the review process. For details, refer to Section 6.1. The main components of the Grading Plan and Sediment & Erosion Control Plan have been identified in Section 6.1.2 above. 6.2.4.4 MS4 Pollution Prevention Plan The MS4 Pollution Prevention Plan Checklist and Manual is available in Appendix H. The checklist shall be completed and submitted with the plan. The manual contains County -approved installation and maintenance specifications for temporary control measures. Specifications for proprietary temporary control measures, such as concrete washout structures and vehicle tracking pads, shall be submitted and approved prior to use. The MS4 Pollution Prevention Plan Checklist and Manual was developed to help the Qualified Stormwater Manager (QSM) with implementation of structural and non- structural temporary control measures used during each phase of construction, from initial disturbance to final stabilization, to prevent the discharge of pollutants from the site. It is the QSM's responsibility to identify all potential pollutants onsite and to implement temporary control measures for each pollutant. A list of potential pollutants include: Vehicle tracking of sediments Land disturbance and storage of soils • Loading and unloading operations • Outdoor storage of construction site materials, building materials, fertilizers, and chemicals. • Bulk storage of materials • Vehicle/equipment maintenance and fueling • Significant dust- or particulate -generating processes • Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, and oils Concrete truck/equipment washing, including the chute and associated fixtures and equipment Dedicated asphalt/concrete batch plants or masonry mixing station WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 184 • Waste sources such as sanitary waste, construction site waste, and worker trash • Other non-stormwater discharges, including construction dewatering or power washing • Other areas or operations where spills can occur (if so, specify) 6.24.5 Future Development For developments not requiring a Grading Permit, such as a re -subdivision of land or phased construction sites, MS4 requirements remain applicable. If no land -disturbing activities are planned, the applicant may only be required to submit a Drainage Report, including, but not limited to, the design of a permanent water quality feature and associated drainage features and a Long -Term Operation and Maintenance Plan. Upon commencement of land -disturbing activities, additional documents, such as a Grading Plan, Sediment & Erosion Control Plan, and MS4 Pollution Prevention Plan will be required. 6.2.5 MS4 Requirements for Construction Activity 6.2.5.1 Stormwater Inspections As required by the MS4 Permit, the County is required to routinely inspect construction sites at a frequency of at least every 45 days. The Department of Public Works maintains the authority to increase inspection frequencies based on historical violations. It is the responsibility of the applicant to contact the Department of Public Works to schedule the first inspection, at which time, the temporary control measures necessary to begin construction will be inspected (I.e. perimeter control and vehicle tracking control). The applicant shall provide notice a minimum of seven days prior to commencing construction activity. Failure to schedule an inspection is considered a violation of MS4 requirements, and a stop work order or other enforcement actions may be pursued. During routine inspections, the inspector shall review the current site conditions using the documents submitted during the review process. Significant changes in plans may require modifications to be submitted for approval. Minor changes should be noted in the Grading Plan and Sediment & Erosion Control Plan, MS4 Pollution Prevention Plan, or SWMP, which are to be kept onsite at all times. The inspector shall assess all onsite control measures, pollutant sources, and discharge points to determine if an illicit discharge has occurred or has the potential to occur. If violations are found, the applicant will be notified verbally, via email and/or certified mail, depending on the severity of the violations. A compliance inspection then will be scheduled no later than 14 days from the date of the violation. If violations are not corrected by the time of the compliance inspection, and a schedule for compliance is not being followed, escalating enforcement procedures shall be followed until the site reaches compliance. This may include a formal Notice of Violation (NOV), the issuance of a Stop Work Order and holding all permits for the site until violations have been corrected. If violations continue to exist, judicial enforcement responses may be pursued depending on the severity and recalcitrance of the violations. Refer to the Enforcement section below. Indicator (drive -by) inspections may be conducted at any time to assess site conditions. However, if violations are found during indicator inspections, the applicant will be contacted to remedy the violations and to schedule a follow-up compliance inspection. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 185 When construction activity is completed, inspections shall occur at least every 90 days until the site has reached final stabilization and all temporary control measures have been removed. If the contractor is no longer associated with the site, the CDPS permit shall be transferred to the landowner, and the completed transfer shall be emailed to Public Works. A final walkthrough will be performed to release the Grading Permit. 6.2.5.2 Construction Enforcement Upon finding a stormwater violation that does not require emergency suspension, the inspector will verbally inform the owner and/or operator of the necessary corrective action. If the violation is corrected during the inspection, no further action is required. For all remaining violations, the inspector will notify the owner and/or operator detailing the required corrective actions, and a follow-up compliance inspection will be scheduled. Depending on the severity of the violation, alternatives to the follow-up compliance inspection may be allowed, such as submitting photos of the corrective action. When the site reaches compliance, the routine inspection frequency will resume. If violations were not corrected by the follow-up compliance inspection, an NOV will be issued, specifying a date by which compliance must be obtained to avoid further enforcement action. If corrective actions are found adequate during the compliance inspection, the routine inspection frequency will resume. If the violations detailed in the NOV were not corrected by the specified date, additional NOVs may be issued, in combination with additional enforcement actions, such as Stop Work Orders and placing holds on permits. If compliance is not being achieved through previous methods, the Department of Public Works may decide to pursue an administrative entry and seizure warrant for abatement in addition to any potential civil and/or criminal enforcement. A hearing with the BOCC will be scheduled to assess the costs of the abatement, and these costs will become a lien against the property from which the causes of violation have been remediated. Additionally, the County may, without prior notice, seek the suspension of MS4 discharge access, such as issuing a Stop Work Order, to stop an illicit discharge or threatened discharge which presents, or may present, imminent and substantial danger to the environment, to the health or welfare of persons or to any MS4 or waters of the state. If the violator fails to comply with a suspension order issued in an emergency, the Department of Public Works may take such steps as deemed necessary to prevent or minimize damage to any MS4 or waters of the state. The BOCC may assess the costs of the abatement and such costs will become a lien against the property from which the causes of violation have been remediated. A person commits an offense if the person reinstates access to the MS4 without prior approval of the Department of Public Works. For more information on enforcement procedures, refer to Weld County Code Section 8-9. 6.2.6 MS4 Requirements for Post Construction When developing a site within the MS4 area, stormwater drainage shall be treated by use of a permanent water quality control measure prior to discharging into any MS4. The MS4 Permit allows for several exemptions; however, exemptions must be reviewed and accepted by Weld County staff prior to use. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 186 6.2.6.1 Exemptions The following exemptions are allowed in the MS4 area: 1. Large -Lot Single -Family Sites: A single-family residential lot, or agricultural zoned lands, greater than or equal to 2.5 acres in size per dwelling and having a total lot impervious area of less than 10 percent (10%). Atotal lot imperviousness greater than 10 percent (10%) may be allowed when a study specific to the watershed demonstrates the expected soil and vegetation conditions are suitable for infiltration/filtration of the WQCV for the site. The maximum total lot impervious covered under this exclusion shall be 20 percent (20%). 2. Undeveloped Land: Sites with land disturbance to undeveloped land (land with no human -made structures such as buildings or pavement) that will remain undeveloped. 3. Above Ground and Underground Utilities: Activities for installation or maintenance of underground utilities or infrastructure that does not permanently alter the terrain, ground cover, or drainage patterns from those present prior to the construction activity. This exclusion includes, but is not limited to, activities to install, replace, or maintain utilities under roadways or other paved areas that return the surface to the same condition. This list contains the most common exemptions, but other exemptions are listed in the MS4 Permit and may be allowed. All exemptions will be approved on a case -by -case basis. 6.2.6.2 Permanent Water Quality Control Measure Design Permanent water quality control measures must meet at least one of the "Base Design Standards" detailed in the MS4 Permit. No exemptions or variances to the standards are allowed for applicable development within the MS4 area. For the purposes of this section, the "permittee" is the landowner. The following italicized "Base Design Standards" were excerpted from the MS4 Permit, and all references made can be found within that document. The entire permit is available on the CDPHE website. 1. WQCV Standard The control measure(s) is designed to provide treatment and/or infiltration of the WQCV and: 100 percent of the applicable development site is captured, except the permittee may exclude up to 20 percent, not to exceed 1 acre of the applicable development site area when the permittee has determined that it is not practicable to capture runoff from portions of the site that will not drain towards control measures. In addition, the permittee must also determine that the implementation of a separate control measure for that portion of the site is not practicable (e.g., driveway access that drains directly to street). The exclusion of up to 20 percent of the site will be approved only in extreme cases when other forms of treatment are infeasible. Use of this exclusion will not be approved if flows can be diverted to the main permanent water quality control measure, or a separate permanent water quality control measure can be installed. It is the duty of the Engineer to demonstrate the hardship and prove that alternative methods cannot be employed. Cost in this case is not considered a hardship. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (87 Evaluation of the minimum drain time shall be based on the pollutant removal mechanism and functionality of the control measure implemented. Consideration of drain time shall include maintaining vegetation necessary for operation of the control measure (e.g., wetland vegetation). Most commonly, applicable development will require a detention pond, sized for the 100 -year storm event and releasing within 72 hours, for flood control purposes. Detention ponds designed to current standards and rainfall data meet the WQCV Standard. However, if the site drains to a detention pond designed under previous standards and/or rainfall data that do not meet the WQCV Standard, a new permanent water quality control measure is required. Additionally, a permanent water quality control measure is required even if a site qualifies for an exception to detention. • In order to show compliance with this design standard, the plan must detail the percentage of the site is 8 being captured and treated by the permanent water quality control measure. If there are any excluded ;:f. areas proposed, a hardship must be demonstrated. Public Works will assess these on a case -by -case basis. N .3!-2 Examples of permanent water quality control measures meeting the WQCV Standard include detention "l_m ponds (with orifice plates), bioretention (with underdrains), and sand filters (with underdrains). ▪ Calculations for the WQCV Standard can be found in the USDCM, Volume 3. 2. Runoff Reduction Standard Oa`+s In M The control measure(s) is designed to infiltrate into the ground where site geology permits, evaporate, or evapotranspire a quantity of water equal to 60 percent of what the calculated WQCV would be if all pi are impervious area for the applicable development site discharged without infiltration. This base design � Y�standard can be met through practices such as green infrastructure. "Green infrastructure" generally 12®n; refers to control measures that use vegetation, soils, and natural processes or mimic natural processes to manage stormwater. Green infrastructure can be used in place of or in addition to low impact development principles. The Runoff Reduction Standard is most commonly used for sites qualifying for an exception to detention or sites draining to a detention pond which was not originally designed to meet the WQCV Standard. Examples of permanent water quality control measures meeting the Runoff Reduction Standard include grass swales, grass buffers, bioretention (full infiltration), and sand filters (full infiltration). Calculations for the Runoff Reduction Standard can be found in the USDCM, Volume 3. 3. Applicable Development Site Draining to a Regional WQCV Control Measure The regional WQCV control measure must be designed to accept the drainage from the applicable development site. Stormwater from the site must not discharge to a water of the state before being discharged to the regional WQCV control measure. The regional WQCV control measure must meet the requirements of the WQCV Standard listed above. The design engineer is encouraged to use guidance documents, spreadsheets and programs provided by MHFD to assist in designing the BMPs. Other software programs may be used, but the designs will be verified using the MHFD spreadsheets. The most current versions of MHFD spreadsheets can be downloaded from the MHFD website at https://udfcd.orq/software. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 188 Control measure technology is changing constantly. Weld County will evaluate the use of newly developed control measures on a case -by -case basis when complete documentation of all assumptions is provided. Weld County reserves the right to review alternative methods and compare with other commonly used approaches, including those discussed in the USDCM. 6.2.6.3 Certificate of Occupancy Upon completion of the permanent water quality control measure, the applicant will submit an As -Built Drawing, certified by a Colorado licensed Professional Engineer, of the permanent water quality control measure and associated drainage features. An As -Built Drawing Checklist, can be found in Appendix D. Upon receiving the As -Built drawing, Public Works will schedule an inspection of the permanent water quality control measure and associated drainage features to visually confirm site conditions with the submitted drawing. If the inspector has no concerns, the Certificate of Occupancy (CO) may be obtained. If not, the CO will be withheld until all concerns are addressed. For redevelopment sites or sites in violation, an 'MS4 hold' will be placed on the parcel, under which no permits will be issued until MS4 requirements are met. 6.2.6.4 Release from Grading Permit A site reaches final stabilization when all construction, paving, and landscaping is complete, and has reached at least 70 percent permanent vegetative cover. Upon achieving final stabilization of the site and release of the CDPS Construction Stormwater Permit, a final inspection will be conducted to verify final site conditions with the previously submitted Site Plans and As -Built Drawing. When confirmation is obtained, the site can be released from the Grading Permit. If the inspector observes conditions other than in the approved documents, additional actions and/or submittals may be required. Grading Permits may be subject to a permit renewal fee. 6.2.6.5 Long -Term Inspections of Permanent Water Quality Control Measures Permanent water quality control measures and associated drainage features shall be routinely maintained to function properly. Long-term operation and maintenance of the permanent water quality control measure will be verified by an annual inspection or at a rate determined by Public Works staff, not to exceed five years. If the volume capacity of the permanent water quality control measure cannot be visually verified, such as with a concrete trickle channel or other structural marker, Public Works may require a survey to be completed by a Professional Land Surveyor. Confirmation of the volume capacity will be confirmed in a report stamped by a Colorado licensed Professional Engineer. The survey and report may be required every five years. Upon change in ownership, the new landowner will be responsible for the proper operation and maintenance of the control measure. O&M Plans may be updated at any time by contacting the Public Works Department. 6.2.6.6 Post -Construction Enforcement When a violation is determined by an inspection, the owner will be notified either informally or formally based on the severity of the violation. Informal notification may be verbally communicated, or a written notice will be sent, usually by email. If corrective actions are made within a reasonable amount of time, no further action is required. If corrective actions are not made within an agreed -upon schedule, a WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 189 formal NOV will be issued by certified mail. Additionally, an NOV may be issued if violations are severe or occur repeatedly at the site. If corrective actions are not made within the specified amount of time, then an 'MS4 hold' will be placed on the parcel. Additionally, a hearing may be scheduled with the BOCC. If an illicit discharge has occurred or will likely occur, the Department of Public Works may take immediate action in cleaning up or preventing the contaminant from discharging into the MS4. Specific details concerning enforcement can be found in the Weld County Code. _ 6.2.7 MS4 Requirements for As -Built Drawing Checklist 2 The purpose of this checklist, provided in Appendix D, is to assist the applicant in submitting the required As -Built Drawing for site drainage (ponds, swales, inlets, outlet structures, spillways, etc.) "m•• implemented within the MS4 area. As-Builts are typically a red -lined copy of the original plans, clearly depicting all changes made in the field. Elevations shown in the plans shall be verified through survey. Materials, dimensions, pond capacity and other aspects of the design shall be verified by the engineer. Additional sheets may be added to the As -Built Drawings if there is not enough room on the original N,33 plan. Oda 6.3 REVEGETATION Guidelines for revegetation in Weld County are provided in the Weed Management section of the Weld � as `S County Public Works website. For more information regarding revegetation, refer to the Revegetation mot_ chapter of the USDCM, Volume 2, and the Temporary and Permanent Seeding Fact Sheet (EC -2) of the USDCM, Volume 3. aS oNN g 6.3.1 Site Preparation C_ An initial evaluation of site conditions is necessary for successful revegetation. Site preparation activities :2:1 ao'•M should include, at a minimum: • Initial hydrologic evaluation • Initial weed evaluation and control • Topsoil preservation (including existing wetland soil) • Soil testing • Soil amendment • Seed bed preparation • Tree protection A list of noxious weeds is provided in Chapter 15, Article I of the Weld County Code. In the case that noxious weeds exist onsite, the appropriate steps need to be taken before, during, and after work is completed to control their spread. Soil amendments may be needed to improve the existing soil conditions prior to revegetating the site. Recommendations for soil amendments are provided in the Revegetation chapter of the USDCM, Volume 2 and include, but are not limited to, fertilizers, compost, peat, humates, sulfur, gypsum, lime, wood chips, and soil micro-organisms. For disturbance of soils within the Weld County right-of-way, soils should be tested to determine requirements for fertilizing and conditioning. Based upon the test results, hydraulic growth medium (HGM) may be required. Contact Public Works for fertilizer and HGM requirements. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 190 6.3.2 Seeding and Planting In addition to the site preparation guidelines outlined in the Revegetation chapter of the USDCM, Volume 2, seed mixtures should be coated with Mycorrhiza at the rate of 2 pounds per acre at the time of seeding. The Weed Management page of the Weld County Public Works website provides recommended seed mixes for use within Weld County. The design engineer is encouraged to work with Weld County Public Works in selecting a suitable seed mix. The two applicable seeding styles in Weld County are drill seeding and broadcast seeding. Drill seeding involves placing the seed in a firm seed bed just under the surface, which provides the best seed -to -soil contact and yields higher success rates. Typical application for this method uses 11 pounds to 14 pounds of pure live seed (pls) per acre. Broadcast seeding involves placing the seed directly to the surface of the soil, and typically uses 20 pounds to 24 pounds pls per acre. Ideal seeding dates are from April 1, or spring thaw, to June 15 and from September 15 until consistent ground freeze for non -irrigated areas. Winter and early spring seeding should not be conducted if the soil is frozen, snow covered, or wet (muddy). Hydro -seeding will be approved by Weld County only on a case -by -case basis. In order for a project to come to completion, it will be required that the project site achieve 70% plant density during full growing season. 6.3.3 Mulching Mulching is the practice of applying a protective layer of material onto the soil surface of plantings or a seeded area. Mulching may be achieved through straw or rolled erosion control product (RECP) installations. If mulching with straw, the straw must be certified weed -free. Mulching will not be conducted in wetland areas. Hydromulch will be approved only on a case -by -case basis. 6.3.4 Maintenance A maintenance and management plan should be established for each project to ensure successful revegetation post -construction. Recommended maintenance activities include, but are not limited to: Weed control and long-term management Reseeding bare areas where grasses did not establish Repairing erosion control fabrics, if applicable • Stabilizing eroded areas, particularly following large storm events • Installing protection from animal damage • Temporary or permanent irrigation, as needed Removing debris Installing and/or repairing temporary fencing to control foot traffic, particularly in heavily used park areas Wetland areas usually require specific post -construction monitoring as part of the Clean Water Act Section 404 permitting process. These requirements should be coordinated with Weld County Public Works. Refer to the Revegetation chapter of the USDCM, Volume 2 for more information. The property owner/developer is fully responsible for site maintenance and revegetation. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 191 6.3.5 Erosion Protection Design Criteria Protecting major drainage channels from erosion is critical for maintaining channel stability. Channels need to be designed so that they remain stable until they are fully constructed or vegetated. It may be necessary to install riprap, straw bales, erosion control logs, or erosion control blankets in the channels to ensure that they remain stable. The BMPs outlined in the USDCM, Volume 3, shall be used to ensure stability. 4944878 Pages: 184 of 285 02/16/2024 12:24 PM R Fee:$0.00 Carly Kopp.., Clerk and Raoordar, Wald County , CO VIII MAMIE. VIOlini IiiiiIIIO1141MINIPM IA Bill WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 192 CHAPTER 7 FEMA FLOODPLAIN REQUIREMENTS All development, as defined by FEMA, shall comply with all floodplain regulations and codes, including the need to submit a CLOMR and a LOMR to FEMA for review and acceptance if applicable. For more information regarding floodplain regulations, refer to Chapter 23, Article XI, of the Weld County Code; the 2022 Colorado Water Conservation Board (CWCB) Rules and Regulations for Regulatory Floodplains in Colorado; and Title 44 Code of Federal Regulations (CFR) 59, 60, and 65 of FEMA's regulations. Floodplain-related work will be reviewed by the Weld County Department of Planning Services and a permit will be issued for all compliant submittals. For more information regarding floodplain modeling and mapping requirements refer to FEMA's Guidance for FEMA's Risk Mapping, Assessment and Planning. 7.1 BACKGROUND INFORMATION Weld County is a participant in FEMA's National Flood Insurance Program (NFIP), therefore, Weld County is responsible for ensuring that floodplain regulations, per FEMA, the state of Colorado, and Weld County are administered. Failure to administer the floodplain regulations can result in the suspension of Weld County from the NFIP. Suspension from the NFIP results in the inability of Weld County residents to obtain flood insurance and the suspension of disaster assistance funding from FEMA in the event of a natural disaster. 7.2 FLOODPLAIN MANAGEMENT OBLIGATIONS Weld County has several cases that govern many of the requirements set forth in this WCECC: The boundaries of the floodplain should be accurately determined and based on a reasonable standard. Mallett v. Mamarooneck, 125 N.E. 2d 875 (N.Y. 1955). Adoption of a floodplain regulation to regulate flood -prone areas is a valid exercise of police power and is not a taking as long as the regulation does not go beyond protection of the public's health, safety, morals, and welfare. Hermanson v. Board of County Commissioners of Fremont, 595 P.2d 694 (Colo. App. 1979). The adoption by a municipality of floodplain ordinances to regulate flood -prone areas is a valid exercise of police power and is not a taking. Morrison v. City of Aurora, 745 P.2d 1042 (Colo. App. 1987). 7.3 FEMA FLOODPLAINS There are several hundred square miles of FEMA mapped floodplains in Weld County. Refer to the Flood Insurance Rate Maps (FIRMS) that are published by FEMA to determine if a proposed project is located within a mapped floodplain. The floodplain maps can be obtained from the FEMA Flood Map Service Center and the floodplain boundaries are depicted on the Property Portal Map maintained by Weld County. The Weld County Department of Planning Services should be contacted to determine if there have been any LOMRs or other changes to the floodplain boundaries that affect the project area. 7.3.1 Floodplain Requirements All development, as defined by FEMA, requires a Floodplain Permit (FP) or Floodplain Development Permit (FHDP) from Weld County. The applications can be found on Weld County's Planning and Zoning • WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 193 website. Contact the Weld County Department of Planning Services to determine which application is required. The designer should also be aware that a CLOMR and a LOMR are required if there is an increase greater than 0.00 feet or a decrease greater than 0.3 feet in regulatory floodways. A CLOMR and a LOMR are also required if there is an increase or a decrease greater than 0.3 feet in the WSEL in regulatory floodplains. Sections 4.7 and 5.7 of this WCECC discuss the criteria for constructing hydraulic structures within an open channel. All design engineering of the hydraulic structures must follow accepted FEMA methodology. Construction of hydraulic structures within FEMA floodplains must not increase the WSEL for Zone A or Zone AE. Per FEMA regulations, a Floodplain Development Permit (FHDP) shall be required for the construction of channels and other major drainage system components within the floodplain. It may be necessary to submit a CLOMR and a LOMR to FEMA as part of the development process. 484467'3 Pages : 188 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Knapes, Clerk and Recorder, Wald County , CO VIII 14U��IIIIR�1Ii I �1lt�� y ik i�� Pl��l��kW�k 1I 111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 194 CHAPTER 8 TRAFFIC CRITERIA This Chapter discusses the requirements for developing and submitting Traffic Impact Studies, traffic control devices, access to county roads, access design, auxiliary lane requirements, access construction within County right-of-way, and tracking control standards. 8.1 TRAFFIC IMPACT STUDIES A Traffic Impact Study (TIS) is required to analyze the effects of a proposed development or other land use action on the transportation system to determine if adequate public facilities exist to serve the proposed development, and to clearly identify any improvements required to mitigate the impacts on the transportation system. When a plan for development or redevelopment is submitted, the applicant is responsible for assessing the traffic impacts of the additional traffic to the surrounding transportation system under existing (current), short-range and long-range horizons. If a project is adjacent to a road that is under the jurisdiction of another entity (CDOT, City, Town, or adjacent County), the applicant is responsible for contacting that entity to determine the traffic analysis and access approvals that may be required. Any proposed access to a State Highway will require a CDOT Access Permit and direct coordination with CDOT. 8.1.1 Traffic Impact Study Area Traffic impacts shall be analyzed within the traffic impact area. The determination of a traffic impact area is done on a case -by -case basis; however, at a minimum the limits of the study should include: 1. Internal roads. 2. Adjacent roads. 3. Access locations and/or new intersections. 4. Off -site roads to the nearest paved County collector or arterial road or state highway. 5. Off -site roads where traffic from the proposed development or land use action will account for at least 20 percent of the average daily traffic upon build -out. 6. Off -site intersections where traffic from the proposed development or land use action: a. Contributes a 10 -percent impact of the peak hour traffic on any approach leg of an intersection where the intersection is operating at a level of service (LOS) C or better upon build -out. b. Contributes a 5 -percent impact of the peak hour traffic on any approach leg of an intersection where the intersection is operating at a LOS D or worse upon build -out. c. Impacts a specific turning movement that currently does not have an auxiliary turn lane by at least 50 percent of the peak hour volume warrant for an auxiliary turn lane. 8.1.2 Preliminary Traffic Impact Analysis A preliminary traffic impact analysis (traffic narrative) shall be submitted with every project application for the application to be considered complete. The intent of the analysis is to determine the project's cumulative development impacts, appropriate project mitigation and improvements necessary to offset a specific project's impacts. This analysis shall include the following information: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 195 1. Describe how many roundtrips/day are expected for each vehicle type: Passenger Cars/Pickups, Tandem Trucks, Semi-Truck/Trailer/RV (Roundtrip = One trip in and One trip out of a site). 2. Describe the expected travel routes or haul routes for site traffic. 3. Describe the travel distribution along the routes (e.g. 50 percent of traffic will come from the north, 20 percent from the south, 30 percent from the east, etc.). 4. Describe the time of day that you expect the highest traffic volumes. IN Public Works will review the narrative and advise the applicant if more information or an engineered 0-t traffic impact study is required. 8.1.3 Traffic Impact Study Requirements A full TIS is required for any proposed development or land use zoned Commercial or Industrial, any Na3 residential subdivision greater than nine (9) lots, or when determined necessary by the Engineer. The TIS o�►� should address impacts to on -site and off -site roadways and highways within the County and shall be ao r °f prepared, stamped, and signed by a Professional Engineer licensed in the state of Colorado. The TIS shall include, at a minimum, the following information: 414 wE�� 1. Describe the traffic impact area, including at a minimum those elements described in the traffic dp: impact study area section of this document. 2. A location map showing the development site, the boundaries of the traffic impact area, and all a®an roads, intersections, bridges, or other roadway structures in the traffic impact area. 112CM 3. Define the following study horizons for the Full Traffic Impact Study: the existing current r„p �� p (current), � short- range, and long-range horizons. :WM a. Existing Horizon: The intent is to establish a baseline traffic condition. b. Short -Range Horizon: The intent is to evaluate the immediate impacts of the project on the transportation system. The short-range horizon year is defined as the point of full buildout of the proposed development or land use action. If the project is proposed to occur over multiple phases, the impacts shall be analyzed at the point of full buildout of each phase. In no case shall the short-range horizon exceed five (5) years. c. Long -Range Horizon: The intent is to evaluate the impacts of the fully developed project U ` in the context of regional transportation planning efforts. The long-range impacts are analyzed as of the end of the current Regional Transportation Plan 20 -year planning J at ° horizon. U � aomi l 4. Identify the existing, approved, and proposed land uses within the traffic impact area. NO3� wm _�• 5. Describe existing traffic conditions within the traffic impact area, including average daily traffic co:f r. volumes for roadways and impacted intersections and a.m. and p.m. peak hour levels of service 0 2LL —C for intersections. 4.37 a. Existing daily traffic data must be obtained from the Department of Public Works. If the ma "� data are not available for the area in question or data is outdated (older than 24 months a`"r' 4 for daily counts or 12 months for intersection counts), then the designer may obtain new traffic data. Daily traffic counts must be collected over a 72 -hour period starting on ,om a a Tuesday and ending on a Thursday of a normal week, excluding any holidays or events NNY`� riiiiL that may skew results. Daily traffic counts must have been collected within the past 24 `ri months. Intersection turning movement counts must be collected for at least two hours each of the morning and evening peak hours of a typical weekday (Tuesday, WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 196 Wednesday, or Thursday) and must have been collected within the past 12 months. Existing daily roadway and intersection peak hour traffic counts must be included for the study area. Any traffic counts collected for the study should be included in Appendix 6. For short-range traffic projections, provide references, calculations, and data sources for all trip generation estimates. The trip generation results shall be shown in a table with the following information: a. Land Use b. Unit of Measurement (for example, per dwelling unit, per 1,000 sq. ft., etc.) c. Total number of units d. Trip generation rates per unit for average daily traffic and peak hour volumes e. Total number of trips generated for average daily traffic and a.m. and p.m. peak hours 7. Short-range and long-range traffic projections must also include forecasts for the growth in background traffic. 8. Provide trip distribution estimates for the roads and intersections in the traffic impact area based on the following: Tables in the report need to show the trip generation rates used, based on the most recent version of the Institute of Transportation Engineer's Trip Generation Manual. If no Trip Generation Manual information is available, the site -specific number of trips can be calculated based on the number of employee trips for each shift time, number of deliveries, additional trips entering/exiting, and other applicable trips that may enter and exit the site throughout a typical day. a. Vehicle Types The number or percentage of anticipated trucks should be included in the trip generation. In the analysis, a Passenger Car Equivalent (PCE) should be used to account for slower -moving trucks in the traffic stream. The procedures for converting trucks to PCEs can be found in the latest edition of TRB's Highway Capacity Manual or in the CDOT State Highway Access Code. If a haul route is associated with the development, the route should be called out in the report. b. Trip Distribution The directional analysis for the site -generated traffic should be presented clearly. If internal trip reductions or pass -by trips are used in the calculations, they must be clearly documented. c. Total Proposed Volumes The total proposed trips and corresponding turning movement counts should be clearly shown for both the short-range horizon (project opening year) and for the long-range horizon (20 -year planning horizon). WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 197 9. Present the volumes for short-range and long-range traffic including the projected traffic for the proposed development or land use action for the a.m. and p.m. peak hour and average daily conditions. These volumes must include turning movements at intersections as well as volumes for roads in the traffic impact area. 10. Analyze the adequacy of the transportation system to handle the projected traffic for short- range and long-range planning years. Key elements in this analysis should include: a. Generalized daily traffic volume level of service for roadways and intersection levels of service for a.m. and p.m. peak hours, based on the following guidance: The LOS must be analyzed at each intersection within the study area. For unsignalized intersections, the worst -movement approach must be reported. The County has established LOS C as the minimum acceptable threshold at both signalized and unsignalized intersections. If LOS C cannot be achieved in the existing, opening year, or horizon year analysis, mitigation should be recommended and documented. The existing peak hour LOS and delay calculations should be based on the procedures outlined in the latest edition of the TRB's Highway Capacity Manual. Typically, the weekday morning and evening peak hour will be used for analysis, but if the site's peak hours are anticipated at other times of day, the proposed peak hours of analysis should be approved by the County. The following traffic analysis scenarios must be included: • 2 8 U Fin am•� is `+ �No � Ir-a>m raeM • Existing (Current) Year, without project • Short -Range Analysis, Project Opening Year with Project Traffic • Long -Range Analysis (20 -year planning horizon) without Project (Background Traffic) • Long -Range Analysis (20 -year planning horizon) with Project If the project is proposed to open in phases, the analysis of multiple opening year scenarios may be required. An additional Background Traffic Project Opening Year scenario may be required if background traffic volumes are anticipated to be significantly higher than under Existing Year conditions. Each analysis scenario should be presented clearly, with graphics showing the proposed access locations, assumptions used for trip distribution, trip assignment, intersection turning movements, daily traffic volumes, and LOS. Any existing or background intersection or roadway operational and geometric deficiencies in the study area should be clearly noted. b. The appropriateness of access locations and if necessary, a traffic signal warrant analysis. Requirements for access spacing are included in Section 8.5. All existing and proposed intersections within the study area should be assessed to determine if spacing criteria are met. 4844875 Pagaa: 190 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp• , Clerk and Recorder, Weld County , CO WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 198 If an intersection within the study area may be signalized, a traffic signal warrant analysis should be performed based on the warrant criteria in the latest edition of the MUTCD. Both the opening year and horizon year conditions should be evaluated to determine if the intersection may meet warrants. c. The need for auxiliary lanes (turn lanes, deceleration, and acceleration lanes), including explanations of how acceleration/deceleration lengths, storage lengths, and taper lengths were determined. Requirements for auxiliary lanes are included in Section 8.7 and are based on the CDOT State Highway Access Code Rural Highway (Category R -B) classification requirements. If the roadway has characteristics differing from a Rural Highway, the designer should refer to the Access Code to utilize a more appropriate classification to calculate auxiliary lane needs. All intersections and site access points within the study area should be evaluated to determine if auxiliary lane warrants are met. If auxiliary lanes are in place, the study should determine if the storage length, taper length, and deceleration/acceleration lane distances meet minimum requirements with the added site traffic. d. Sight Distance All site accesses should be evaluated to ensure sight distance minimum requirements are met based on the requirements in Section 8.6. If applicable, the study should evaluate if changes to passing zones are recommended in the vicinity of the site due to the proposed development. e. Crash History A crash history and safety analysis may be required if the site is proposed to access a location where the County has identified a safety concern. Consultants may need to purchase third -party software, such as DiExSys, to analyze the safety performance functions of a location based on existing and proposed new traffic. If a location is found to perform at a level of service of safety greater than 3, then improvements must be determined to reduce the level of service of safety. Weld County will accept locations that have a level of service of safety of 1, 2, or 3. f. Sites Accessing Gravel Roads If the site is proposed to access gravel roads, an assessment should be performed to determine if development of the site requires consideration of paving the road. See Section 8.9 for Tracking Control requirements. g. Parking Needs For non-residential development, ensure that the site has adequate on -site or on -street parking available. h. Safe Routes to School and/or School Bus Stops WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (99 For residential development, identify existing or proposed school bus stops within the study area, existing and proposed sidewalks, and note any deficiencies and proposed improvements. i. Access to Public Transit If there is public transit within the study limits, identify accessibility to public transit and safe pedestrian/bicycle access to the nearest transit stop within half a mile of the project site. Haul Route If applicable, the site's proposed haul route should be identified. Any deficiencies along the haul route (such as pavement, bridge deficiencies, etc.) must be called out along the haul route, even if it is outside of the project study area. k. Provide a summary of conclusions and recommendations from the full Traffic Impact Study, including at least the following items: I. A summary listing of traffic impacts from the proposed development on existing and proposed roads and intersections within the traffic impact area. m. A summary listing of the improvements needed to assure adequate service and safety levels on the roadway system affected by the proposed development, identify and describe each proposed improvement, how and when it will be funded, and expected completion dates. i. The TIS should clearly state recommended improvements to the site accesses, intersections, and roadway system for the short-range and long-range years. Include any auxiliary lane recommendations, modifications to existing storage bay lengths, intersections recommended to be signalized, proposed turning restrictions at intersections or access points, modifications to roadway surface, or improvements required along the roadway. ii. An updated LOS analysis should be performed where mitigation is recommended to ensure that acceptable operations can be achieved for both short-range and long-range conditions. iii. Identify and describe each proposed improvement, how and when it will be funded, and expected completion dates. n. Any reasonable additional information deemed necessary for review —special considerations. Public Works will review the TIS and advise the applicant if more information is needed or provide technical comments on the submittal. 8.1.4 Traffic Impact Study Checklist A stand-alone checklist will be provided to developers along with the Pre -Submittal Requirements packet found in Appendix I of this document. 4944678 Palos: 192 of 285 02/19/2024 12:24 PM R Fee:$0.00 Carly Knees., Clark and Recorder, Weld County , CO �IIII�.r01Kti�li�l��l'�I:�+�tih�+�.('��itisllilk 1I III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1100 8.1.5 Updating Existing Traffic Impact Studies The following scenarios will require the preparation of an update (or amendment) to a previous study, or the preparation of an entirely new study. 1. When the time or circumstances of the original study fall within the parameters presented in Table 8-1, the applicant shall prepare the appropriate documentation identified in Table 8-1. 2. When the original study was prepared for a large, complex, or phased project and was designed, organized, and written to function as a "base" or master plan document for future development applications, it must include updates to the County comprehensive plan. (These types of studies require scoping consultation with the County prior to their preparation.) 4944875 Pages: 193 of 285 02/15/2024 12:24 PM R Fss:$0.00 Carly Kopp., Clark and Rsoordar, Wald County , CO VIII IMIONdttliltlitill MrMJ UA NA IN IA II III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (101 Table 8-1 Updating an Existing TIS Changes to the Original Development Original Report is: Access changed, or trip generation increased by 15% or more Access did not change, and trip generation did not increase by 15% or more < 2 years old Amendment letter: identify and discuss only items that changed Letter documenting change; include level of service (No other traffic requirements) > 2 years old New study Amendment letter, including: • Updated traffic counts (daily counts taken over 72 hours) • Revised trip generation • Revised LOS analysis • Meet all current TIS requirements 8.2 CHANGE IN ACCESS USE If the use of an existing access to County right-of-way changes or there is a change in the use of the property, a new Access Permit will be required, in accordance with Chapter 8, Article 14 of the Weld County Code. Change in access or property use may include, but is not limited to, change in the amount or type of traffic, structural modification, remodeling, change in use or type of business, expansion of existing business, change in zoning, change in property division, and creation of new parcels. 8.3 TEMPORARY ACCESS Any road access that will be closed after being used for a limited time may be considered a temporary road access, or a road that will be temporarily used for a different purpose may be considered a temporary upgrade in use. The time in use of temporary accesses will not exceed 18 months. A Temporary Access Permit may be granted only if the temporary access meets minimum County traffic safety and operational requirements (Weld County Code Sec. 8-14-10, et sea), including sight distance and tracking control that is discussed in further detail in Section 8.6 For a Temporary Upgrade in Use Access Permit, the access must meet prior use standards and regulations including use, width, and turning radii after the permit expires. 8.4 TRAFFIC CONTROL DEVICES AND PLANS All road signs, striping, delineators, barricades, signals, and other traffic control devices will conform to the most current edition of MUTCD and any applicable Colorado supplement, as amended. The applicant will be required to install all necessary signage and will bear all expenses for the fabrication and installation of road name signs, permanent barricades, and signs for implementing the approved project design (e.g., one way, no parking, no outlet, stop sign, speed limit). Necessary signage will include signs required on County roads as a consequence of the applicant's project, such as regulatory, guide, or warning signs. Signs and barricades will be in place prior to road acceptance. 8.4.1 Signage and Striping Plans All road improvement and/or land development projects must incorporate a separate signage and striping plan in accordance with the criteria of this section. Striping plans may not be required for local subdivision roads. However, sign plans are still required for all subdivisions. All signing and striping plans WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (102 will conform to the most current edition of the MUTCD. All traffic control devices will be fabricated and installed in accordance with the MUTCD. Permanent signage and striping will be complete and in place before any new roadway is opened to the public for use. 8.4.1.1 Signage Plan Elements 1. Show the general longitudinal location of each sign (horizontal offset and station). 2. Specify the sign legend and sign type. 3. Specify the sign size. 8.4.1.2 Striping Plan Elements 1. Include stripe color and type. 2. Include lane width, taper lengths, storage lengths, etc. 3. Include striping/skip interval. 4. All permanent pavement marking materials, except point location markings, must meet current CDOT specifications for thermoplastic traffic marking paint unless another material is specified by the engineer and approved by the County. 5. All point location markings (stop bars, turn arrows, words, symbols, etc.) must meet specifications. 6. Include station and offset or dimensions for all angle points, symbol locations, and line terminations. 7. Include stripe dimensions. 8. Delineate raised median islands. 8.4.2 Striping guidance A stop line (stop bar) should be placed a minimum of 4 feet in advance of the nearest crosswalk line at controlled intersections. In the absence of a marked crosswalk, the stop line should be placed at the desired stopping point but should not be placed more than 30 feet or less than 4 feet from the nearest edge of the intersecting traveled way. Preferred distance is 10-12 feet from edge of traveled way. 8.4.3 Type and Location of Signs The Department of Public Works will make the final determination regarding the type and location of traffic control devices within the right-of-way or access easement. These controls will include traffic control signs, road name signs, delineators, and permanent barricades. 8.4.4 New Roadway Signage Permanent signage, unless otherwise approved by the Department of Public Works, will be installed before any new road or access easement is opened for use. 8.4.5 Memorial Sign Applications A memorial sign must be requested by the victim's family or another sponsor with the consent of the victim's family, in accordance with Weld County Code, Chapter 8, Article VI, Sec. 8-6-180. Upon submittal of a Roadside Memorial Sign Application with fee to the Weld County Public Works Department, Public Works will review the application for acceptance. See also Appendix 8-L and 8-M of the Weld County Code. 4944875 Pages: 195 of 285 02/15/2024 12:24 PM R Fes:$0.00 Carly Kopp., Clerk and Raoordar, Weld County , CO BIM WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (103 8.4.6 Construction Criteria Refer to Section 10.9.1 and Section 10.9.2 for more -detailed information on construction criteria of pavement marking and traffic control devices. 8.5 ACCESS POINTS The Weld County Code defines an access as the place, means. or way vehicles or pedestrians shall have safe, adequate, and legal ingress and egress to a lot, trail, open space, off-street parking space or use. Weld County recognizes that property owners have a right of reasonable access to the County road system. However, within an environment where population growth will increase traffic volumes and operational pressure on the general transportation system, be it rural or urban, access control is crucial to protect the public health, safety, and welfare. Access control is used to maintain smooth traffic flow, to provide road right-of-way drainage, and to protect the functional level of the County roads while meeting state, regional, local, and private transportation needs and interests. Weld County Code Sec. 8- 14-10, et seq., contains the County's Road Access Policy. Also refer to the Weld County Functional Classification Map and Transportation Plan, available on the County's Transportation Planning webpage. An access permit application must be submitted for any new proposed access to a County -maintained road. If a property is proposed to directly access a State Highway, access must be approved and obtained by CDOT as described in Section 8.3.1.1.a. If a property is proposed to directly access a road under the jurisdiction of a local municipality, access must be approved and obtained by the local municipality. If a property has frontage on two roads, it is recommended access should be obtained from the lower volume road when possible. Intersection and access spacing criteria (as measured from centerline to centerline) for local roads, collector roads, and arterial roads are shown in Table 8-2. Table 8-2 Minimum Intersection and Access Spacing Criteria (feet) Access Element Arterial Collector Local Distance between intersections Signalized Unsignalized 2,640 1,320 N/A 1,320 N/A 330 Distance between access points and intersections 660 660 330 Distance between access points 660 330 150 Distance between access points in Subdivisions N/A N/A 75 If design criteria cannot be met for auxiliary lane requirements or if an operational threshold of LOS C cannot be maintained, the proposed access may be approved as restricted movement, as described in Section 8.5.6. 8.5.1 Local Roadways Access standards to local roadways will be governed by Weld County recognizing that property owners have a right of reasonable access to the County road system. However, within an environment where WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (104 population growth will increase traffic volumes and operational pressure on the general transportation system, be it rural or urban, access control is crucial to protect the public health, safety, and welfare. Access control is used to maintain smooth traffic flow, to provide road right-of-way drainage, and to protect the functional level of the County roads while meeting state, regional, local, and private transportation needs and interests. Weld County Code Sec. 8-14-10, et seq., contains the County's Road Access Policy. Also refer to the Weld County Functional Classification Map and Transportation Plan, available on the County's Transportation Planning webpage. Whenever possible, shared accesses will be given priority. • 8.5.2 Collector Roadways 8 U Access standards to collectors are shown in Table 8-2. An access or new intersection onto a collector is not permitted unless it meets the spacing requirements in Table 8-2 and an alternative access or 67 8 _ intersection to a lower classified road is not feasible. No more than one access will be allowed to an individual or to contiguousparcels under the same ownership unless it can be shown that the additional Na3� 8 •�� -� access would not be in conflict with local safety regulations; the additional access would not be ,-. detrimental to public health, safety, and welfare; and the additional access is necessary for the efficient �LL o use of the property. ' a 8.5.3 Arterial Roadways Access standards onto arterial roadways are shown in Table 8-2. An access or new intersection onto an arterial is not permitted unless an access/intersection to a lower classified road is not feasible and the ®.IC Q proposed access meets the spacing requirements in Table 8-2 and does not interfere with the location, c.& planning, and operation of thegeneral street system or access to nearby properties. Whenever possible, ro,,� p g p Y p P shared accesses will be given priority. No more than one access will be allowed to an individual or to thaLia contiguous parcels under the same ownership unless it can be shown that allowing only one access would be in conflict with local safety regulations; the additional access would not be detrimental to public health, safety, and welfare; and the additional access is necessary for the efficient use of the property. Intersections will be spaced no less than one -quarter mile apart on arterials, unless such spacing is impractical or impossible due to topographic or other physical limitations as determined by • the Department of Public Works. The type of access —full movement, three-quarter movement, or right - 8 a- in/right-out movement —will be determined by the Department of Public Works. - 8.5.4 State Highway and Interstate Systems - CDOT and FHWA rules and regulations will apply to all highway and interstate accesses. Weld County .4 takes no jurisdictional authority over access onto a highway or interstate. mw^-� •3 _� m _ �;� 8.5.5 Shared Accesses GI L� °+'� Whenever possible and feasible, shared access will be provided to serve two or more adjacent 4 �-V properties. A shared access is to be centered on the common property line. For shared accesses, the �b County strongly recommends the property owner establish a written access road maintenance rove agreement so future owners of the properties will be aware of their requirements for shared maintenance of the access road. Shared access and utility easements shall be a minimum of 30 feet wide in.Y and shall contain a minimum 20 -foot -wide, all-weather roadway. �mcro� WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 0.05 8.5.6 Restricted Movement Access If the minimum spacing criteria cannot be met, or if the minimum level of service threshold of LOS C cannot be achieved, the County may require that the movements at an access be restricted to ensure traffic safety. The following types of access are most common: 1. Full movement access. All potential movements for the access are allowed. 2. Three-quarter access. All movements are allowed except a left turn out of the access. 3. Right-in/right-out access. Only right turn in and right turn out movements are allowed. 8.5.7 Access Control Plans On corridors with an adopted Access Control Plan in effect, recommendations for each existing and future access location and policies that guide future access management efforts will be enforced. 8.6 ACCESS DESIGN Access points will be designed to provide safe movement for traffic entering and traveling on roadways within the County. Like intersections, access points are conflict locations. The basic design of access points includes adequate spacing, proper alignments, and clear sight distances. 8.6.1 Geometric Design Accesses shall enter onto Weld County roads at an 80- to 100 -degree angle, for a minimum of one vehicle length. An access approach that is gated will be designed so that the longest vehicle (including trailers) using the access can completely clear the traveled way when the gate is closed. In no event will the distance from the gate to the edge of the traveled surface be less than 35 feet. Any overhead entry structures shall have at least a 14 -foot, 6 -inch clearance, measured from the access surface. When the access is intended for commercial or industrial use, the access radii shall accommodate the turning movements of anticipated vehicle types. AutoTURN exhibits may be required by the County if there is a safety or operational concern. Table 8-3 shows the access width and access radii for properties based on land use. Table 8-3 Access Geometry Type of Land Use Maximum Access Width at ROW Access Radii Single-family residential 24 feet wide 25 feet minimum Commercial/Industrial/Agricultural 40 feet wide 65 feet minimum Fill slopes and cut slopes will be constructed to match the slopes of the existing County road adjacent to the maximum access width as identified at the ROW line. It is desirable that all side slopes be no steeper than 4:1 (H:V). Drainage culverts are required for new access points unless otherwise approved by the County. Minimum required size is a 15 -inch aluminized CMP or RCP. See Section 5.8.3 of this document for allowable culvert types. Minimum cover requirement will be 12 inches above the pipe crown to the bottom of asphalt at the edge of pavement (for paved roads) and a minimum of 12 inches of cover above the pipe crown to the top of the finished grade (for gravel roads). All culverts should be sized to convey the flow water based on the existing capacity of the ditch and meet the HW/D requirements specified in Chapter 5 of this document. Figure 8-1 shows a typical access approach. Dimensions of radius and access width should be determined by Table 8-3, above. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (106 Figure 8-1 Access Approach - -WELD COUNTY -ROAD 8.6.2 Access Sight Distance Accesses are stop controlled so the access sight distance discussed in this section is the distance required for vehicles to enter traffic and accelerate to the average running speed. There shall be an unobstructed sight distance along both approaches and both sides at an access (within the right-of-way) for distances sufficient to allow the operators of vehicles that are approaching simultaneously to see each other in time to prevent collisions at the access. All clear sight triangles must be within the public right-of-way or a sight distance easement. See also Figure 8-2. Distance az in Figure 8-2 is equal to distance a1 plus the width of the lane(s) departing from the intersection on the major road to the right. Distance az also should include the width of any median present on the major road. The appropriate measurement of distance a1 and distance az for departure sight triangles depends on the placement of any marked stop line that may be present and, thus, may vary with site -specific conditions. In Weld County, the typical distance behind the traveled way to the stop bar is 14 feet. b = 1.47Vmajortg Eq. 8.6.1 b= Access Sight Distance (see Figure 8-2) V„,„„. Design Speed of major road (MPH) tg= time gap needed for vehicle entering major road (sec) tg= 7.5 Car, 9.5 Single -Unit Truck, 11.5 Combo -Unit Truck Adjust tgfor crossing more than 2 lanes: +0.5/extra lane for cars +0.7/extra lane for trucks Also adjust tgfor starting grade of the vehicle if it exceeds 3% +0.2 sec/percent grade for cars and trucks (only for starting uphill) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1107 The value calculated should be rounded up to the nearest 5 feet. Additional information regarding sight distance for intersections and cases other than the stop control condition can be found in AASHTO's A Policy on Geometric Design of Highways and Streets. Figure 8-2 Departure Sight Triangles at Access (Stop Control) Weld County Rd b Clear Sight Triangle Decision Point N3N U � Q = fi Departure Sight Triangle for Viewing Traffic l _ fi a2 N 3 U � Q= b Ot Weld County Rd Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic Approaching the Access/Driveway from the Left Approaching the Access/Driveway from the Right 8.6.3 Subdivision Roads Sight Distance Roads should not have visible impediments between 3 feet and 8 feet in height at subdivision intersections within a triangular area, as shown in Figure 8-3. Figure 8-3 Subdivision Road Sight Distance Triangle -EDGE OF DRIVING SURFACE (FLOWLINE) 4044675 Pigs.: 200 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Kopper, Clerk and Recorder, Wald County , CO BIM �aolNroF afEmEmoN 40' EDGE OF DRIVING SURFACE (FLOWLINE) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1108 8.7 AUXILIARY TURN LANES Auxiliary lanes are useful in maintaining the safety, traffic flow, and operation of a roadway or access. When auxiliary lanes are required by the County or warranted by information obtained during the development review process, the applicant is responsible for design, installation, and any purchase of right-of-way to accommodate the required lane width. Auxiliary lanes are required when unique location factors (e.g., roadway speed and traffic density, access volume, the volume of commercial trucks, the influence of nearby accesses, existing auxiliary lanes close to the proposed access, nearby traffic control devices, available stopping sight distance, and other topographic or roadway design factors) exist that determine the need for auxiliary lanes. Auxiliary lanes are required to mitigate specifically identified and documented locations with safety and/or operational problems. These include: • Any access where high traffic volume or lack of gaps in traffic make an auxiliary lane necessary for vehicles to safely and efficiently enter/exit the roadway. • Any locations where conditions such as horizontal or vertical curves and sight obstructions exist that cannot be removed and may negatively affect public safety or traffic operations. Auxiliary lanes typically consist of one or more of the following: transition taper, acceleration or deceleration length, and storage length (see Figure 8-4). The use of these components varies based on speed limit, through street classification, and site -specific conditions (grades). Figure 8-4 Auxiliary Lanes Layout ACCELERATION LANE ...s...,.....r TRANSITION TAPERS REDIRECT TAPERS REDIRECT TAPERS ACCELERATIONLANE DECELERATIONLANE DECELERATION LANE TRANSITION TAPERS Auxiliary turn lanes shall be installed on local, collector, and arterial roadways according to the criteria in Table 8-4, which is consistent with the requirements for Rural Highways in the CDOT State Highway Access Code. Auxiliary lanes may be also required at the County's discretion if safety needs or unique location factors discussed above warrant the addition of an auxiliary lane. Auxiliary lane thresholds should incorporate a passenger car equivalent factor based on the existing and projected bus, truck, and combination volumes. 4944875 Pages: 224 of 285 02/10/2024 12:24 PM R Fee:$0.00 Carly Kopp. , Clark and Raoordar, Wald County , CO !PAR' rgell:IIII I: M' h I�M�1 11��Yk 11 I WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1109 Table 8-4 Auxiliary Lane Requirements Classifications Auxiliary Lane Criteria to be Checked Minimum Ingress Left Turns Required for Left- Turn Deceleration Lane Minimum Ingress Right Turns Required for Right -Turn Deceleration Lane Minimum Egress Right Turns to Require Right- Turn Acceleration Lane Minimum Egress Left Turns to Require Left -Turn Acceleration Lane Arterial 10 vph 25 vph 50 vph May be required if it would benefit the safety and operation of the roadway Collector 10 vph 25 vph 50 vph May be required if it would benefit the safety and operation of the roadway Local 10 vph 25 vph Generally not applicable Generally not applicable Geometric Components Deceleration Length + Taper Length + Storage Length Deceleration Length + Taper Length + Storage Length Acceleration Length (Includes Taper) Acceleration Length (Includes Taper) The geometric components of a deceleration lane are shown in Figure 8-5 and of an acceleration lane in Figure 8-6. ti oti "� Figure 8-5 a5� Geometric Components of a Deceleration Lane 4044675 Pages: 223 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppas, Clerk and Recorder, Weld County , CO VIII I�.r�N4.srirtM�'rh1� l��M�W F�'��I'i Yk �I II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1110 Figure 8-6 Geometric Components of an Acceleration Lane ► Traffic Direction 1 Taper Length 8.7.1 Auxiliary Lane Length To determine the required acceleration and deceleration lane and transition taper length, see the design criteria presented in Table 8-5 and Table 8-6. Table 8-5 is an excerpt taken from Table 4-5 of the State Highway Access Code, August 31, 1998, for a Category R -B —Rural Highway. A rural highway is described as, "highways that have the capacity for moderate to high travel speeds and low traffic volumes providing for local rural needs. This category may be assigned to low volume minor arterials, secondary collectors and local highway sections that do not normally provide for significant regional, state or interstate travel demands. "The Category R -B meets the needs for most Weld County maintained roadways. The designer should refer to the State Highway Access Code for roadways with characteristics differing from the R -B description above. The length of the required transition taper is determined by multiplying the distance offset (lateral shift) by the transition taper ratio value associated with the posted speed in Table 8-6. The beginning and ending point of all tapers shall be rounded. Acceleration Transition tapers: The purpose of an acceleration lane and transition taper is to provide sufficient length for a vehicle to accelerate to the appropriate speed and merge into the through traffic lanes without disrupting traffic flow. Table 8-6 provides the required acceleration lane and transition taper lengths by design speed. Acceleration lane lengths in Table 8-6 will be adjusted for a grade of 3 percent or more by the factors shown in Table 8-7. The total length of the acceleration lane includes the values of both the lane and transition taper. The length of a transition taper is calculated by multiplying the width of the lane by a standard ratio shown in Table 8-6. The beginning and ending point of all tapers will be rounded. Deceleration Lane lengths: Deceleration lengths shown in Table 8-6 represent the estimated distance to maneuver from the lane into an auxiliary lane and brake to stop. The transition taper is calculated based on design speed and deceleration lane lengths in Table 8-6 will be adjusted for a grade of 3 percent or more by the factors shown in Table 8-7. The storage lane lengths will be included in the calculation, which are shown in Table 8-8 or based on the results of a Traffic Study. Redirect or straight tapers: Redirect tapers will be used where an exclusive turn lane, median, or other redirection of vehicles is necessary and where redirection of the flow of traffic is necessary to accommodate the exclusive turn lane or median. Redirect tapers required for redirecting through travel lanes will be installed in conformance with Table 8-6. If the redirect taper would WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (111 result in a horizontal curve design deficiency for the through movement, the horizontal curve will be corrected. Redirect tapers should be designed as straight tapers with the beginning and ending points rounded. • In cases where there is constrained right-of-way, restrictive topography, or limited distance between intersections, a design waiver may be obtained to construct a shorter auxiliary lane. Table 8-5 Components of Speed Change Lane Lengths for Rural Highways (R -B) from State Highway Access Code Access Category Left -Turn Deceleration Lane Right -Turn Deceleration Lane Acceleration Lane R -B *decel. Length + storage *decel. Length *accel. length *Taper length is included within stated accel. Or decel. length Table 8-6 Acceleration/Deceleration Lane and Taper Design Criteria and Redirect Taper for Through Lanes Acceleration/Deceleration Lane Design Criteria Posted speed limit (MPH) 25 30 35 40 45 50 55 60 65 Deceleration length (ft) 180 250 310 370 435 500 600 700 800 Acceleration length (ft) N/A 190 270 380 550 760 960 1170 1380 Accel/Decel Transition taper (ratio) 7.5:1 8:1 10:1 12:1 13.5:1 15:1 18.5:1 25:1 25:1 Redirect (Straight) taper for Through Lanes (ratio) 15:1 15:1 20:1 30:1 45:1 50:1 55:1 60:1 65:1 Table 8-7 Grade Adjustment Factors for Acceleration Lanes Grade Posted Speed Limit (mph) 25 to 45 50 55 60 65 3 to 4.9% Up Grade 1.3 1.4 1.5 1.5 1.7 5 to 7% Up Grade 1.5 1.8 2.0 2.3 2.5 3 to 4.9% Down Grade 0.7 0.65 0.65 0.6 0.6 5 to 7% Down Grade 0.6 0.55 0.55 0.5 0.5 8.7.2 Storage Lengths The storage length for an auxiliary lane can be determined by the information summarized in Table 8-8. These lengths are based on the average length of a passenger vehicle and the estimated turning vehicles per hour. Estimated lengths for buses, larger trucks, and recreational vehicles must be determined and submitted to the County for review, or a "passenger car equivalent" (PCE) should be incorporated into the storage length calculation. Use a PCE of 3 for each bus and all trucks and combinations of 40 feet in length or longer. Use a passenger car equivalent of 2 for each vehicle or combination at or over 20 feet in length but less than 40 feet. 4944575 Pages: 221 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppa., Clerk and Recorder, Weld County , CO VIIIINFAIRRiPilaillaMilliItwl:OkMI'#%Y bill:On/11%k 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1112 Table 8-8 Auxiliary Lane Storage Lengths Auxiliary Lane Storage Lengths Turning vehicles per hour < 30 30-59 60-100 100 200 300 Minimum required storage length (ft) 25 40 50 100 200 300 Truck traffic generators (ft) 100 100 200 200 200 300 The basis for designing the length of required storage is to provide sufficient length for vehicles to queue within the lane without affecting other movements. Table 8-8 provides the required storage lengths for stop -controlled intersections. Storage lengths for signal -controlled intersections may be determined • from highway capacity nomographs in the Highway Capacity Manual or may be based on the • recommendations of the submitted Traffic Impact Study for the development. If the Department of Public Works determines that meeting the required storage length is impractical or will result in an 3 unsafe condition, the minimum storage length will be based on the mean arrival rate. U� 164 y 8.7.3 Auxiliary Lane Conflicts ��3� o$� The following standards also apply for auxiliary lane design. : 3% 1. No driveway will be permitted within the transition area of any auxiliary lane. 2. In the event that a portion of an auxiliary lane extends across one or more adjacent properties, aaY�i the County may require the applicant to obtain any necessary right-of-way. 3. In the event an auxiliary lane is constructed within 100 feet of an arterial -arterial intersection, the applicant is responsible for design, acquisition of required right-of-way, relocation of as a_ utilities, and construction of the lane to such intersection. 11n a 4. Where two intersections have exclusive turn lanes that overlap or the ending points of the o�= exclusive turn lanes have less than 300 feet or one-half their length of separation (whichever is 1.a,1M shorter), and a significant structure or topographical feature does not preclude widening, a continuous exclusive turn lane will be constructed between the intersections to improve roadway consistency and safety, and to maintain edge of pavement continuity. 5. If restrictive topography allows only one exclusive turn lane, normally a left -turn deceleration lane is given first priority. Where a left -turn lane is installed and the travel lanes must be a redirected, an overlay of pavement is required. 8.8 ACCESS CONSTRUCTION All roadway access construction that affects existing structures within the County right -of -way —such as pavement, curbs, gutters, sidewalks, drainage structures, ditches, and auxiliary lanes —is required to @�1 incorporate modifications to existing structures as part of the final access design. An Access Permit is �m required prior to any new access construction. The Access Permit allows construction of the access : without the need for obtaining a separate Right -of -Way Use Permit unless the proposed access point is ter) f NLL m located within section line County Right -of -Way or if the access is to be paved with asphalt or concrete. ifFLI 8.8.1 Gravel Requirements Y dN m Gravel or recycled asphalt gravel base will be permitted for individual residential access or field access • adjacent to County roads with gravel surfacing. The gravel surface will include a minimum of 6 inches of Np_ WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (113 compacted aggregate base course or equivalent material from the right-of-way line to the edge of the traveled roadway. Specifications for this material can be found in Section 9.6.6. 8.8.2 Pavement Requirements Access pavement thickness shall match roadway pavement thickness. If required by the weather, a delay of one season in placement of hot bituminous pavement may be allowed, provided adequate gravel surfacing is substituted and maintained until asphalt placement. 8.8.3 Access Drainage Accesses shall be constructed in a manner that minimizes erosion and does not result in deposition of silt and debris on the County roadway or in roadside ditches. Accesses that slope down toward the public road will be constructed to assure that water does not run onto or across the traveled public way. This may include designing the crown, borrow ditches, pans, or other elements so that they direct water to the existing drainage facilities along the road. The owner of the property shall pay for materials and the cost of installation for new access culverts whenever the installation of a culvert is made necessary by the creation of a new access from private property to a County roadway. The applicant is responsible for any alterations of the natural flow of water across private properties. 8.8.4 Structures For efficiency and to avoid maintenance or public safety concerns, the County reserves the right to maintain the full width of the road right-of-way without structures located thereon. Structures include, but are not limited to, fences, trash cans, gates, mailboxes, and irrigation structures regardless of whether they are physically located on the traveled portion or right-of-way will be removed from the right-of-way upon written request by the Department of Public Works. Mailboxes may be located in the public road right-of-way only where they do not create a roadside hazard, obstruct or hinder vehicular or pedestrian traffic, or interfere with road maintenance activities such as snowplowing and mowing. Mailboxes will be located at least 8 feet away from the edge of the traveled way. Wear, damage, or breakage to mailboxes, fencing, decorative items, signage, or any other appurtenances throughout the property roadside frontage due to thrown snow and inclusions from snow removal activities on a County -maintained road will not be the responsibility of the County. 8.9 AVERAGE DAILY TRAFFIC COUNT Volume counts are expressed as average daily traffic (ADT) counts or annual average daily traffic (AADT) counts. ADT is the unadjusted, average number of vehicles passing in both directions at a specified location of a roadway. AADT is the term used to show the average traffic volume in both directions on a section of road, adjusted for seasonal variation. Traffic count information for pavement designs must be obtained from the Weld County Public Works Department. If the count information is not available for the area needed, then a traffic count must be completed by the designer and approved by Weld County. The count must be a 72 -hour continuous count and completed on Tuesday, Wednesday, and Thursday of a normal week (no holidays or special events taking place). The traffic count cannot be a raw volume count; it must include a Vehicle Classification. If known changes to the traffic volumes exist since the latest count, such as new development or changes to existing development that could modify the counts, then a new traffic count may be warranted. 4!44673 Pages: 218 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly oem.. , Clark and Recorder, Wald County , CO IIII P.r U PIIMEIMIll 1.14tiliPiltniilimh III III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (114 Table 8-9 Traffic Count Seasonal Adjustment Factors SEASONAL ADJUSTMENT FACTORS Timeframe Adjustment Factor Jan. 1 —Feb. 28/29 1.08 Mar. 1 —Apr. 4 1.00 Apr. 5 —May 16 0.98 May 17 —Jun. 20 0.96 Jun. 21 —Aug. 22 0.94 Aug. 23 —Sep. 26 0.94 Sep. 27 —Nov. 1 0.97 Nov. 2 —Nov. 29 1.04 Nov. 30 —Dec. 31 1.08 8.9.1 Vehicle Classification Vehicle classification categorizes vehicles into three types, as described below. • Lightweight vehicles: All motorcycles, cars, pickups, vans, and single/dual wheels o Class 1 through Class 3 • Single units: Buses and other units up to three axles o Class 4 through Class 7 • Combo units: Vehicles of four axles and more o Class 8 through Class 13 Figure 8-7 shows the most common types of vehicles found on the nation's highways. Designers can use this information to determine which vehicle classification category should be used for the vehicles identified in the traffic count. 4844875 Pages: 218 of 285 02/18/2824 12:24 PM R F.e:$0.00 Carly Kope•s, Clark and Recorder, Wald County , CO IRIIIINIIIVAINIMA NOVA "Ill WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 115 Figure 8-7 FHWA Vehicle Classification (CDOT M -E Pavement Design Manual, Figure 3.6) U NN o N -3 a 464, . Oo N n� ..��n` raw a a.—• r,m a 1 Ire all M. pi a gogo N o in en IN a; ›Ja L no esti. ac 8nsi U - 00 Z3 i N ® CO • a 0 - Q1 Wan 1i O N Ce� �� a a ro r.. N (i) t� Nu -� e-{ OIL_ vi Ire N Q� a GE rN., No all to cr O) N d- s Schema Is i� Ps Donn pt at motorcycles pits two wheel axles all cars piLs oret:wo axle trailers ail pickups and 'tars slrg eRJ Jat vineels buses s nr4rieitLa wheers two axle. s agle wilt At ee' tree axle E 'lgle unit four axle. �1n41e unit tots or ress axles, sing le tr-alln SIX or no re axe singe trailers live cries axles. mull -t .a'.ers six axles, run tetra e -E 5et'en Or more aces nuttl-utters Not used WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1116 CHAPTER 9 SOIL INVESTIGATION AND PAVEMENT DESIGN 9.1 INTRODUCTION AND PURPOSE The design of a pavement structure involves the consideration of many factors and conditions —the most important being traffic volumes, vehicle classifications, design materials, existing materials, local climate, and drainage conditions. The purpose of this chapter is to give general guidance and to supplement the existing design information contained within the latest editions of the 1993 AASHTO Guide for Design of Pavement Structures and the CDOT M -E Pavement Design Manual, as well as AASHTO or ASTM Material Manuals. AASHTO 1993 should be used only for onsite roadway pavement designs and M -E should be used for any offsite pavement designs maintained by Weld County. These criteria provide the basic design procedures and reporting guidelines for flexible and rigid pavements. The final design should be based on a thorough investigation of specific project conditions, projected traffic, life- cycle economics, and on the performance of comparable projects with similar structural sections under similar conditions. An adequate pavement design will reduce long-term maintenance costs and provide a long-lasting driving surface. 9.2 FIELD INVESTIGATION AND SOIL SAMPLES Designers should visit each site to gather information that may help determine the appropriate design. Whether this is a new design or rehabilitation of an existing pavement, information such as current distress, drainage conditions, roughness, traffic control options, and surrounding land usage should be collected and will be used later during the actual design. 9.2.1 Testing Frequency Soil samples within the project limits will be obtained for each soil type as defined in the Soil Survey of Weld County, Colorado (http://websoilsurvey.nres.usda.gov/app/) or at a spacing of not more than 500 linear feet. These boring locations will include, but not be limited to, travel lanes, shoulders, auxiliary lanes, and roadside ditches. 9.2.2 Sampling Procedures Borings can be performed by either an auger or core drill. The depth of each hole generally should be at least 5 feet to 10 feet, depending on the anticipated depths of cuts or fills of a new roadway. Borings for rehabilitation of existing surfaces generally can be on the lower side of the range unless major reconstructions are necessary at certain locations. All borings will be field logged and visually classified. 9.3 SUBGRADE TESTING 9.3.1 Classification Each boring location will be tested to determine liquid limit, plastic limit, plasticity index, and the percentage passing the U.S. Standard No. 200 sieve. Test results will be used to calculate the AASHTO Classification and Group Index using AASHTO M 145. These data will be determined using the following methods: • Liquid limit: AASHTO T 89 or ASTM D 4318 • Plastic limit: AASHTO T 90 or ASTM D 4318 • Percent passing No. 200 sieve: AASHTO T 11 or ASTM C 117 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1117 • Gradation: AASHTO T 27 or ASTM D 422 9.3.2 Swell Test Swell potential evaluation will be required when a soil is classified as an A-6 to A-7 type. • Swell test: AASHTO T 216 or ASTM D2435 9.3.3 pH and Sulfate pH and Sulfate testing will be performed at each boring location. It is important not only to identify the al presence of sulfates but also the depth of occurrence. The designer or project manager should know a what depths are crucial to the success of the design. o- - U� - • Sulfate ion content: CP-L2103 • pH of soils: AASHTO T 289 Na X 9.3.4 Moisture Density �A3 Standard test methods for moisture density are described in AASHTO T 99 and AASHTO T 180. • oae 9.3.5 Hveem Stabilometer _ Representative samples will be tested to determine the subgrade support value using Hveem � aa Stabilometer (R -value) testing. These values will be used in the design of the pavement section. R -value am; will be performed on each soil group (AASHTO classification) but will never be less than a minimum of two per soils report. These tests will be conducted in accordance with the following procedures. We ova a suggest performing the hydrometer testing for all applicable soil of interest since the percent silt and '� clay content in soil are identified as important independent variables. • R -Value: CP (Colorado Procedure) 3101 (AASHTO 1190 & ASTM D 2844-07) where the reference documents used to develop CP 3101 Table 9-1 Test Requirement and Frequency Test Testing Frequency Notes/Exception Liquid limit Each Boring Location Plastic limit Each Boring Location Gradation Each Boring Location AASHTO Classification Each Boring Location pH Each Boring Location Sulfate Each Boring Location Swell Each Clay Soil Type A-6 through A-7-6 soil types Moisture —Density Per Report Bulk sample of material governing pavement design CBR or R -value See Section 9.3.5 9.4 PAVEMENT DESIGN CRITERIA FOR ONSITE ROADWAYS Weld County's pavement design method for onsite roadways is based on the 1993 AASHTO Guide for Design of Pavement Structures equations and CDOT guidelines. This section provides the criteria used for the design of these pavements. These criteria will ensure adequate strength and durability to carry WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1118 the predicted traffic loads for the design life of each project. Alternative designs will be considered as advances are made in pavement design methods and paving materials. Any deviation from the criteria presented in this document must be technically justified and approved by the Public Works Department. Weld County does not allow the use of full -depth asphalt paving and does not accept maintenance of any full -depth paved roads. 9.4.1 Design Equivalent Single Axle Loads (ESAL) There are certain input requirements needed to obtain an 18,000 -pound (18 KIPS) Equivalent Single Axle Load calculation or design ESAL • ii U a71 Annual average daily traffic count (see chapter 8) Vehicle classification (see chapter 8) Traffic equivalence load factors • Traffic growth rate • Design period • Lane factor O. 9.4.2 Traffic Equivalence Load Factors _ The equivalence load factor is a numerical factor that expresses the relationship between axle loads of ac s�iN the three types of vehicles. Table 9-2 presents equivalence loads factors from CDOT's M -E Pavement a•M Design Manual. dp�t • �m r� Table 9-2 Equivalence Load Factors (CDOT M -E Pavement Design Manual, Table H.2) 3 -Bin Vehicle Classification Flexible Pavement Rigid Pavement Lightweight vehicles 0.003 0.003 Single units 0.249 0.285 Combo units 1.087 1.692 z N E 9.4.3 Traffic Growth Rate .� r' The number of vehicles using a road tends to increase with time. Weld County uses a 20 -year growth 1.� m� rate to estimate the future traffic on roadways. The growth rate is applied to all of the vehicle m y V. classifications. A growth rate assumes that the AADT percent growth rate for any given year is applied to _ c-,;',"; the volume during the preceding year. Contact the Public Works Department for assistance in }1"iN-u .. determining an appropriate growth rate. nr. °� �' 9.4.4 Lane Factor o The number of vehicles or ADT on the roadway will be split according to the number of lanes in the C%ii)., proposed roadway. Table 9-3 lists the acceptable values. Q.8E, M � n 0 r; Riz Table 9-3 Lane Factors (Modified from CDOT M -E Pavement Design Manual, Table 3.3) Lanes per Direction Design Lane Factor One lane 0.60 Two lanes 0.45 Three lanes 0.309 Four lanes 0.25 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 119 9.5 FLEXIBLE PAVEMENT DESIGN 9.5.1 Serviceability and Reliability The initial serviceability for asphalt at construction normally will fall in the range of 4.2 to 4.6 and generally will be assumed to be 4.5. The terminal serviceability is based on the current ADT. These factors can be found in Table 9-4. Table 9-4 Serviceability �Q� w �mmN 0 c es Serviceability Loss ADT 2.0 >750 2.5 <750 The reliability factor, shown in Table 9-5, is based on the functional classification of the roadway. Weld County's functional classification map can be found on the transportation planning section of the Public Works Department web page. Table 9-5 Reliability Factor Functional Classification Urban/Rural Arterial 90 Collector 85 Local 80 9.5.2 Standard Deviation Weld County uses an overall standard deviation of 0.44 for all pavement designs. 9.5.3 Drainage Factor The drainage factor shown in Table 9-6 may be incorporated into the pavement design to account for the drainage characteristics of the site. Table 9-6 Drainage Factor Quality of Drainage Water Removed Within: Percent of Time Pavement Structure is Exposed to Moisture Levels Approaching Saturation Less than 1% 1% to 5% 5% to 25% >25% Excellent 2 hours 1.40-1.35 1.35-1.30 1.30-1.20 1.20 Good 1 day 1.35-1.25 1.25-1.15 1.15-1.00 1.00 Fair 1 week 1.25-1.15 1.15-1.05 1.00-0.80 0.80 Poor 1 month 1.15-1.05 1.00-0.80 0.80-0.60 0.60 Very poor Will not drain 1.05-0.95 0.95-0.75 0.75-0.40 0.40 9.5.4 Strength Coefficients The strength coefficients are used in the structural number equation to determine the thickness of the various layers of the pavement structure. Table 9-7 lists the strength coefficients for various potential components of the pavement section. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1120 Table 9-7 Strength Coefficient Component rre1wTest er inch of material) Criteria Conventional Materials HMA 0.44 See Section 9.6.3 *Existing bituminous pavement 0.20-0.40 N/A Aggregate base course 0.14 R -value ≥83 Aggregate base course 0.12 77≤ R -value <83 Aggregate base course 0.11 69≤ R -value <77 Existing aggregate base course 0.09 N/A Treated Materials Fly ash 0.10 7 -day, 150 psi Lime treated subgrade 0.14 7 -day, 160 psi Cement treated base 0.22 7 -day, 100-200 psi Cement treated base 0.23 7 -day, 200-300 psi *Falling Weight Deflectometer or CDOT structural layer coefficients of existing pavements forms will be used to determine the structural coefficient for existing bituminous pavements. 9.5.5 Pavement Thickness Full -depth pavement sections will not be allowed within the County -maintained right-of-way. A composite section of hot mix asphalt (HMA) and free draining sub -base material will be used. Total HMA thickness will not be placed in lifts less than three times the nominal maximum aggregate size of the mix being used. 9.5.6 Pavement Design All pavement design will be prepared in accordance with AASHTO and CDOT pavement design procedures. A computer -generated printout of the design and/or other design calculations must be included with the design submittal. In lieu of design, 12 inches of HMA over 12 inches of aggregate base course (ABC) will be the minimum. 9.6 MATERIAL SPECIFICATION 9.6.1 General All sources of mined or manufactured materials used within the County -maintained right-of-way must be approved annually by the Public Works Department. 9.6.2 Procedure for Material Source Approval On or before April 1 of each year, or a minimum of 14 calendar days before beginning construction, materials suppliers will supply written documentation and material test results from a materials testing laboratory. These will indicate the following: • That the material(s) being tested meet(s) the minimum specifications • The test procedure employed • The material test results WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (121 A signed statement will be provided by the material suppler certifying that the materials tested are representative of the materials to be provided during the coming 365 -day period. 9.6.3 Hot Mix Asphalt HMA will meet the requirements of and be placed according to Table 9-8 below and the latest edition of CDOT's Standard Specifications for Road and Bridge Construction. The 100 gyration mixes should be used on arterial and collector roads. 75 gyration mixes to be used on minor and major residentials roadways. HMA leveling courses, mid mats, and residential wear courses to be 64-22 mixes with a maximum of 20% RAP used in aggregate gradation. HMA topping or wear course should be an SX 64-28 mix with a maximum of 20% RAP, on arterial and collector roads. Table 9-8 Master Range Table for Hot Mix Asphalt from Table 703-4 in CDOT's Standard Specifications for Road and Bridge Construction Sieve Size Percent by Weight Passing Square Mesh Sieves Grading SF Grading ST Grading Sr Grading S Grading SG 37.5 nun (1;4") 100 25.0 MITI (I") 19:0 mm 100 100 90 - 100 90 100 12.5 min 9.5 111111 1101 100 90-100 90 -100 4,75 min () #0 Ia0 2.36 min (48) 28-58 20-58 23-49 19-45 1.18 mm (#16) 30-54 60Oµm 030) 300µm (#50) 150 pm (0100) 75µm (##200) 2-12 2-10 2-10 2-8 1-7 s These additional Form 43 Specification. Screens will initially be established using values from the As Used Gradation shown on the Design Mix. 4944675 Pees: 211 of 265 02/15/2024 12:24 PM R Fee:$0.00 Carly Commeo, Clark and Recorder, Weld County , CO IIIII WAIF N FAME,' II II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1122 9.6.4 Portland Cement Concrete Pavement Portland Cement Concrete Pavement (PCCP) materials will meet the requirements of and be placed according to Table 9-9 below and the latest editions of CDOT's Standard Specifications for Road and Bridge Construction and CDOT's M&S Standard Plans. Table 9-9 Concrete Aggregate Gradation Table from Table 703-1 in CDOT's Standard Specifications for Road and Bridge Construction Steno Size Coarse Aggregates (from AASHTO 6143) Fine Aggregate No. 3 No.357 No. 4 No. 467 No. 57 No.6 No. 67 No. 7 No. 8 50 rum in 25.0 (�„� t° 50 mm to 4,75 nun (2" to 37.5 mm [o 19,0 mm (154" to 37.5 mm to 4,75 no (1'/;'' to 25.0 mm to a 75 (7 i U 19.0 mm to 9.5 rum (inn to 19.0 mm to 4.75 mm (('1" to 1_2.5 mm to 4.75 mm ('," to 9.5 mm to 2.36 ins l'/8 " to 4.75 mm to 150 µm (04 to 1„1 No.4) '/b") .) 041 4'( #41 #4) #8) #100) 63 tern (21/2") 100 100 50 mm (2') 90-100 95-100 100 100 3(7.5 trim (1'4'1) 35-70 90-100 95-I00 100 25.0 mm (1") 0-15 35-70 20-55 95-100 100 100 19'0 tr 0-15 35 - 70 90-100 90-100 100 12.5 tnan 0-5 10-30 25-6(} 20-55 90-100 100 9,5xnrn. 0-5 10-30 0-15 20-55 40-70 85-100 10(1 4.75 mm (1-5 0-5 0-10 0-5 0-10 0-15 1(1--30 95-100 (#4) 2.36 MITI (#8) 0--5 0-5 0--5 0-10 80 100 1.18 tin (# 16) 0 -5 50 85 600 µtn 25-60 (#30) 300µm 10-30 (#50) 150 µtzt 2,1U (#100) 9.6.5 Aggregate Base Course ABC used in the pavement sections shall be crushed angular manufactured aggregate Class 6, unless otherwise approved. Class 6 Aggregate Base Course will meet the requirements in Table 9-10, which shows the gradation requirements, PI requirements, and LA Abrasion requirements. The minimum R - value shall be 69. Angularity of aggregate shall have a minimum fractured faces of one or more as per ASTM D 5821 of 45% or more. Recycled Concrete Product (RCP) aggregate base course shall not be used as shouldering material or as an exposed layer. RCP will be covered by a subsequent layer. The liquid limit shall be as shown in Table 9-10 and the plasticity index shall not exceed six when the aggregate is tested in accordance with AASHTO T 89 and T 90 respectively. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1123 Table 9-10 Aggregate Base Course Requirements Sieve Designation Mass Percent Passing Square Mesh Sieves LL not greater than 35 LL not greater than 30 Standard Mesh Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 ABC RAP (mm) (in) 150 6" 100 100 4" 100 75 3" 95-100 63 2.5" 100 50 2" 95-100 100 100 37.5 1.5" 90-100 100 25.4 1" 95-100 100 85-100 19 3/4" 50-90 100 75-100 12.5 1/2" 55-90 9.5 3/8" 45-80 4.76 No.4 30-65 30-50 30-70 30-65 25-55 2.38 No. 8 25-55 20-85 1.18 No. 16 5-55 0.42 No. 40 0.07 No. 200 3-15 3-15 20 max 3-12 3-15 3-12 5-15 0-5 Plasticity index 0 0 0 <6 <6 <6 <6 <6 LA wear test (T96) 50 max 50 max 9.6.6 Aggregate Surface Course (Gravel) Aggregate used as surface course will meet the following requirements, unless otherwise approved. Furnish hard, durable particles or fragments of crushed stone, crushed slag, or crushed gravel conforming to the following: 1. Los Angeles abrasion, AASHTO T96 2. Mechanically Fractured faces, one or more, ASTM D 5821, crushed material, not screened, to attain fractured face 3. Free from organic matter and lumps or balls of clay 4. Liquid Limit, AASHTO T89 5. Dust ratio: %passing #aoo %passing #40 6. Gradation and plasticity index, AASHTO T90 40% 45% min. 30 max. 2/3 max. As shown in Table 9-11 Do not use material that breaks up when alternately frozen and thawed or wetted and dried. Obtain the aggregate gradation by crushing, screening, and blending processes as necessary. Fine aggregate, material passing the No 4 sieve, will consist of natural or crushed sand and fine mineral particles. Do not furnish material that contains asbestos fibers. Recycled concrete cannot be used as surfacing gravel. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1124 Table 9-11 Aggregate Surface Course Requirements Sieve Designation Mass Percent Passing Square Mesh Sieves Standard(mm) Mesh (in) Aggregate Surfacing 150.00 6 100.00 4 75.00 3 63.00 2.5 50.00 2 37.50 1.5 100 25.40 1 90-100 19.00 3/4" 12.50 1/2" 55-80 4.76 No.4 45-65 2.38 No.8 33-53 0.42 No.40 15-35 0.07 No. 200 4-15 Plasticity index 6-16 LA wear test (T96) 40 max 9.7 SOILS/PAVEMENT DESIGN REPORT The soils/pavement design report will include the following information: 1. Vicinity map of investigated area 2. Transparent overlay of proposed project "plan view" on vicinity and boring location drawings. 3. Scaled drawing showing the location of borings 4. Scaled drawing showing the estimated extent of subgrade soil types, thickness of base material, thickness of and HMA 5. A spreadsheet showing all the factors used to calculate the design ESALs 6. Summary sheet listing all sample designations, liquid limit, plasticity index, percent passing the No. 200 sieve, AASHTO classifications, group index, soil description, R -value, moisture content, percent soluble sulfate, and pH 7. A discussion regarding potential subgrade soil problems, including, but not limited to, soils with swelling potential, frost -susceptible soils, groundwater, drainage considerations (surface and subsurface), cold weather construction (if appropriate), soluble sulfates and pH in the subgrade, and other factors or properties that could affect the design or performance of the pavement system 8. Recommendations to alleviate or mitigate the impact of potential subgrade soil problems 9. Pavement design alternatives for roadway 10. Pavement mix types to be used for the project 11. Any deviations from the County criteria and discussion/justification of the deviation, a formal request will be submitted for approval of the design alternative 12. Signed and stamped by a Professional Engineer licensed in the state of Colorado. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1125 CHAPTER 10 CONSTRUCTION CRITERIA 10.1 GENERAL For the public safety, health, and well-being, it is crucial to ensure that proper construction practices and industry standards are followed. The construction criteria defined within this chapter will be used for any work within the County right-of-way and any infrastructure proposed for County maintenance. In this chapter, the "contractor" is the individual, company, landowner, developer, or other entity legally responsible for the construction work. Unless otherwise indicated, the term "engineer" refers to the current County Engineer or his/her authorized representative, the term "department" refers to the Weld County Public Works Department, and the term "inspector" refers to the current Weld County lead construction inspector or his/her authorized representative. 10.1.1 Policy on the Use of Referenced Publications The information provided herein summarizes and/or supplements minimum standards that have been prepared in great detail by CDOT. The most recent publications of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction and M&S Standard Plans are recognized by Weld County as being the primary documents used by transportation contractors and construction crews. However, CDOT policies represent statewide standards, which do not always satisfy local conditions. When standards differ, the most recent version of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction will govern followed by the instructions and guidance in this chapter will govern. All construction traffic control devices and their use must be in accordance with the latest version of the MUTCD. 10.1.2 Control of Work and Inspection The Department is responsible for oversight and inspection of construction that takes place within the County right-of-way and for infrastructure proposed for County maintenance. In addition to the primary goal of promoting public safety, the goal of County oversight —which takes the form of establishing standards and conducting inspections —is to help ensure quality construction and thereby minimize the long-term maintenance costs associated with County -maintained infrastructure. The County has the authority to impose standards on construction work and determine whether it has been constructed in accordance with approved plans. The contractor is responsible for staying informed about and complying with all federal, state, and local laws, ordinances, and regulations that may affect the work or impact those employed to do the work. The contractor will indemnify the County against any claim or liability arising from the County's actions. Failure to meet these conditions can result in suspension of the work by the Department. The Department will have the authority to suspend work if the contractor has failed to maintain safe conditions for the public. Such notification will be presented to the contractor in written form, at which time work will cease immediately —except for any activities necessary to position traffic control devices and put other safety measures in place to leave the project site in a safe condition during the shutdown, as directed by the engineer. The engineer will be the final authority in matters related to the proper WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1126 interpretation of approved plans and will make final determinations when discrepancies in the plans or disputes between the inspector and the contractor occur. The inspector will have the authority to inspect all work and materials being used. The role of the inspector is to use acceptable engineering techniques and professional judgment to determine if the construction is being accomplished according to the methods described in the standards. The contractor will cooperate fully with inspection efforts, allow access to all parts of the work, and furnish any information required for complete and detailed inspections. Inspection by the department will not relieve the contractor or its designated representatives of the responsibility to control the work and ensure compliance with the approved plans and specifications for the project. 10.1.3 Project Acceptance and Warranty All work that does not conform to the standards and the approved plans —whether resulting from poor workmanship, use of defective materials, or lack of care —will be considered unacceptable work. Unacceptable work will be subject to removal and restoration prior to final acceptance of the project by the County. Disputes related to the acceptability of work will be subject to a final determination by the engineer. Upon written notice from the contractor of the completion of all work, the inspector will make a final inspection. If all project work is determined to be in compliance with the standards, the approved plans, the performance guarantee, the subdivision improvement agreement, and the contract agreement or other applicable agreements, the County will initiate the procedure for final acceptance and perform an inspection for final acceptance. If the inspection discloses any work as being unacceptable, the Public Works Department will notify the contractor in writing. After corrections have been made, another final inspection will be scheduled. The contractor will be responsible for maintenance and traffic control until final acceptance of the project has been granted by the Public Works Department. Final acceptance does not relieve the developer and/or contractor of a minimum two-year warranty on all workmanship and materials incorporated into the project, unless specified otherwise by the County. The warranty period will commence on the same date that written final acceptance is granted. Prior to the end of the warranty period, the inspector will arrange for the project to be inspected and will notify the contractor of any work items to be completed. 10.2 CONTRACTOR RESPONSIBILITIES 10.2.1 Qualifications, Insurance Requirements, and Licensing Any contractor performing work within the right-of-way will have the qualifications to complete the work in an acceptable and timely manner and will receive the necessary permit(s) from the Public Works Department before beginning work. Contractors will be fully licensed, insured, and possess a valid IRS Taxpayer Identification Number. The Department reserves the right to suspend or deny work being performed by any contractor or business that has been determined by the engineer to be unqualified to perform construction within the right-of-way. The contractor will indemnify the County from lawsuits and claims of any type that may occur as a result of its actions while performing work within the right-of-way. Until final acceptance of the project, the WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1127 contractor will procure and maintain insurance coverage in the minimum amounts specified in the most recent version of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction from an insurance company authorized to do business in the State of Colorado. 10.2.2 Pre -Construction Meetings Contractors shall be required to schedule and attend a pre -construction meeting prior to starting work on complicated projects. The engineer can waive this requirement if the project is small or straightforward and it is determined that a meeting is not necessary. Attendees at the meeting typically are the contractor's key personnel, subcontractors, material suppliers, utility companies, material testing firms, the County inspector, and the County engineer. The meeting typically is held at least one week prior to start of construction. The pre -construction meeting agenda likely will include the following: • Exchange of contact information (phone numbers, fax numbers, etc.) • Applicable safety requirements, contact information, and emergency procedures • Construction traffic control requirements and methods Construction schedule with key dates and benchmarks Required contract paperwork (insurance, bonds, escrow, permits, etc.) Material submittals and testing requirements Special conditions and access requirements 10.2.3 Permits Permitting requirements are discussed in Chapter 11 of this document. In addition to approved construction plans, Weld County often will require obtaining and adhering to all requirements of a Transport Permit, Right -of -Way Use Permit, Access Permit, Grading Permit, and Floodplain Development Permit. The contractor will be fully informed and knowledgeable of all required state and federal permits. Weld County is not responsible for ensuring the contractor has satisfied permit requirements from other agencies. However, copies of fully executed permits will be furnished to the engineer or inspector upon request. 10.2.4 Public and Worker Safety All work will be conducted in a manner that minimizes obstructions to traffic and pedestrians. The safety of the traveling public and adjacent landowners is the most important issue on every construction project. Contractors must inspect and maintain the project to ensure safety, as they bear the sole responsibility for any accidents or injuries related to the construction. The Department has the authority to suspend work if the contractor has failed to maintain safe conditions. The contractor will observe all rules and regulations of federal, state, and local health officials and departments. No workers are allowed to be required to work in unsafe surroundings or under conditions that are unsanitary, hazardous, or dangerous. Contractors will be fully informed and knowledgeable of all current construction safety practices and protective equipment to be used for specific work conditions. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1128 The contractor is responsible for complying with all safety regulations governed by the Occupational Safety and Health Administration (OSHA). The inspector is not responsible for enforcing these regulations, but will monitor construction activities for obvious or suspected noncompliance with OSHA regulations and will report any such issues to the contractor and the engineer. If imminent danger potentially resulting in serious injury or death is identified in the construction area, and the contractor has failed to act immediately to correct the dangerous condition, the engineer can issue a written work suspension order. 10.2.5 Utility Coordination When excavating or grading in the area of underground utilities, the contractor will comply with Article 1.5 of Title 9, Colorado Revised Statutes, "Excavation Requirements." as modified by SB-18-167. The contractor will notify all affected utilities at least two business days prior to commencing work and will contact the Utility Notification Center of Colorado (UNCC) at 8-1-1 to have locations of UNCC-registered utilities marked onsite. All other underground facilities will be located by contacting the respective utility owner. Affected utility company representatives should be invited to the pre -construction meeting. Where the contractor's operations are adjacent to a utility owner's facilities, work will not commence until arrangements (acceptable to both parties) for the protection of the utilities have been made. The approved plans will clearly indicate those utility items that are to be relocated or adjusted by the utility owner and those utility items that are to be constructed by the contractor. The contractor will meet with the utility owners as often as necessary to coordinate and schedule relocations or adjustments. Weld County is not responsible for the actions of utility owners, and the contractor will not seek damages or claims against the County for coordination, inconvenience, delay, or damages sustained due to interference from the utility owners. 10.2.6 Dust Control The contractor is responsible for dust control related to its construction project. The contractor also is responsible for compliance with the Colorado Air Quality Control Act. The majority of construction sites can achieve adequate dust control by providing a water -spray truck to keep moisture in the exposed soil. Water trucks may be required on any construction sites that disturb an area of land greater than 1 acre, or for projects that are using gravel roads as the main access to the construction site. The goal of dust control is to prevent airborne particulates (dust) from leaving the construction site or access roads. Damages or health issues caused by dust leaving the construction site are the sole responsibility of the contractor. The contractor will be responsible for cleaning up and removing any dirt or dust that has left the construction site. Closure of a roadway often requires the contractor to set up a designated detour route for traffic. If the detour route uses an existing gravel road, dust mitigation and road deterioration can quickly become a problem. Such detours often will require the contractor to apply a durable dust treatment, such as magnesium chloride. The department will determine the quantity, frequency, and locations of such dust treatments. The contractor will need to use a county approved vendor which has a Right-of-way Use permit with the county for the application. The inspector will monitor the construction site and let the contractor know if dust control measures are inadequate. Reasonable complaints received by the County or contractor from adjacent landowners, or WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1129 the traveling public will be addressed by the contractor in 24 hours or less. Failure to respond to reasonable requests (as determined by the County) to provide dust control or failure to provide a water truck on the construction site can result in a written suspension of work order from the engineer. 10.2.7 Traffic Control During construction, the contractor will be responsible for supplying and maintaining traffic control devices according to the requirements of the MUTCD. Any work within the right-of-way requires approval of the Method of Handling Traffic (MHT) by the department prior to work commencing. In addition, any road closure within the right-of-way that will last for three days or more requires approval by the BOCC prior to work commencing. The contractor should allow at least two weeks prior to the planned road closure to obtain required approvals from the County. The contractor's MHT will be prepared by a person knowledgeable and qualified in the area of traffic control, who is a certified Traffic Control Supervisor (TCS). The MHT will be easily readable, prepared in a professional manner, and include the following elements: • A project site location map • A diagram showing the location of all traffic control devices • A tabulation of the sizes, types, and quantities of all traffic control devices • Location of all existing roads and accesses within the traffic control zone • Certifications of all TCSs and flaggers working on the jobsite Traffic control devices will be inspected by the contractor's TCS for proper placement on at least a daily basis and will be inspected during the nighttime at least once per week. The reflective surfaces of all signs will be checked and cleaned on a regular basis, no less frequently than every two weeks. For safety reasons, the contractor will not store materials or equipment near open travel lanes. Portions of the roadway that are open to traffic will be maintained, kept clean, and kept free of snow and ice by the contractor. The inspector will monitor the traffic control set-up to ensure the MHT is being followed and to look for any problems that need to be corrected. If the inspector deems that changes to the traffic control are necessary, this will be communicated to the contractor and/or TCS. 10.2.8 Removal of Unacceptable or Unauthorized Work Unacceptable work resulting from any cause found to exist prior to final acceptance of the project will be removed and replaced in an acceptable manner at the contractor's expense. The construction of transportation facilities requires a high degree of precision and quality from the contractor. These facilities will eventually be used by the traveling public, who assume that safe and predictable driving and drainage conditions exist. Failure to remove and/or replace unacceptable or unauthorized work within the right-of-way can expose the contractor to liability. The inspector is authorized to ensure the contractor is following approved plans and specifications, to identify work that is unacceptable or unauthorized, and to communicate such findings to the contractor. The contractor will correct the identified work in a timely manner. If the contractor and the inspector disagree about whether work is unacceptable or unauthorized, the final determination will be made by the engineer. 4944875 Pagss: 2103 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO VIII PAW tiLr, VIti1inell'AI J "III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G E 1130 10.2.9 Record Drawings and Record Keeping Preparation and organization of project records and record (as -built) drawings is an important step for ensuring proper future maintenance of transportation facilities. This is especially true when the project includes construction of underground facilities. Changes in the scope of work, geometric design, structural plans, typical sections, standard plans, specifications, and corrections of design errors must be incorporated into the as -built plans. These as - built plans shall be sealed by the engineer responsible for changes. Information shown on the as -constructed plans should include, but is not limited to the following: Structures: Show tip elevation of piling for each pier, wall, or abutment. Show structure changes for both minor and major structures. Show type, manufacturer, manufacturer's project number, and shop drawing number of bridge expansion and bearing devices installed. Show elevation and placement of brass cap benchmarks, when used. The elevation should be project specific and marked on the plans. All temporary benchmarks on the plans will be lined out. Vertical and lateral clearances should be indicated Plan and Profile: 2 Show the final location of new utility placements, unknown utility discoveries, relocations, and changes. Abandoned utilities should be shown and noted. Show all geometric revisions to alignment, super elevation, and grade. Show significant changes in revised slope catches specifically ordered in the field oa Show final locations of minor structures. N m; Show locations of discovered underground features, such as foundations or pipes, which are left in place. i Show detailed information on the location of all buried material within the County right-of-way ga ate$, or project limits. tea= Detail any new or deleted accesses. d !b Drainage Plans: v+VZ C • Meet the requirements of the As -Built Drawing Checklist provided in Appendix D of this � � 1701% document �e a� Prior to final acceptance of construction work, the contractor will turn in all requested as -constructed information, materials testing information, electronic files, and submittals to the inspector for review. The As -Built drawings shall follow the requirements for As -Constructed drawings that are set for in the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction 4944613 Pages: 202 of 283 02/16/2024 12:24 PM R F..:$0.04 Curly Kopp's, Clark and Recorder, Wald County , CO 1111 FAA UMW M WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1131 10.3 MATERIALS QUALITY CONTROL AND TESTING 10.3.1 Qualifications of Testing Personnel and Laboratories Materials Process Control testing is an important and necessary part of any successful transportation project. Testing of construction materials (soil, concrete, asphalt, etc.) ensures the owner and contractor that suppliers are providing the materials specified and adequate construction methods are being used. CDOT qualifications related to materials are covered extensively in CDOT's Colorado Procedure 10 (CP10). It should be noted that Weld County does require the contractor to meet the qualifications for testing personnel described in CP10. All process control testing by consultant or material testing firms should be done in accordance with AASHTO and (CP) Colorado Procedures as directed in the CDOT Field Materials Manual - OA Frequency Guide Schedule for Minimum Materials Sampling, Testing and Inspection. The AASHTO and CDOT Field Materials Manuals have developed and published detailed and specific standard procedures to be used for materials testing. The contractor will be responsible for providing material testing that meets the requirements of the applicable testing standard. The inspector will provide oversight to ensure material testing is being performed properly and that testing laboratories being used are adequate. 10.3.2 Minimum Testing Types and Frequencies The contractor will make arrangements to provide material testing of the types and frequencies described in the latest version of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction. The inspector may accept some reduction in inspection and testing procedures under certain conditions. If the contractor does not intend to meet the minimum testing frequencies listed in the frequency guide schedule in the latest version of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction, it must provide a written explanation to the inspector at least 48 hours prior to start of the related construction. Examples of conditions under which the minimum testing frequencies may be reduced by the inspector could include: • Very small quantities of materials are being used. • The construction work is taking place outside of the roadway structural prism. • The construction work is temporary in nature. • The inspector has determined that construction methods being used easily exceed minimum requirements, thereby resulting in predictable passing test results. 10.3.3 Material Sources and Sampling All material sources used will meet the requirements of the approved plans and specifications. If the contractor intends to use any materials that do not meet the requirements as described in the County criteria, it must provide a written description and request prior to or at the pre -construction meeting. The engineer then may choose to review the information and grant a variance prior to construction starting. 4844675 Pages: 201 of 285 02/10/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO IIIII FAO 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (132 The inspector will be granted access by the contractor to sample and test all material to be incorporated into the work. Failure to allow such access will result in a suspension of work order being issued by the engineer. The inspector reserves the right to request proof from the contractor that materials being delivered to the jobsite are coming directly from approved sources. All materials will be handled and delivered in a manner such that their quality and acceptability are not adversely affected during the process. Aggregates and pavement mixes will be delivered to the jobsite in trucks designed to prevent loss or segregation of materials. The contractor will be aware that if materials delivered to the jobsite show excessive segregation, disturbance, or contamination, they may be rejected by the inspector. HMA that has cooled excessively also may be rejected by the inspector. 10.3.4 Required Submittals Contractor submittals given to the County for review and approval will vary for each project, depending on the scope and complexity of the work to be performed. A simple Access Permit or utility crossing may not justify multiple submittals, while a large-scale bridge or roadway construction project may require many submittals. The contractor will consult with the engineer prior to the pre -construction meeting for a specific list of required submittals. A typical large-scale project could include submission, review, and approval of the following documents: MHTs Construction schedule Shop drawings or fabrication details Concrete and asphalt mix designs Soils laboratory test information Manufacturer's product data and installation instructions Copies of required worker's certifications and qualifications Certificates of compliance and material samples Documents required by County Codes or by the Planning Department 10.3.5 Soils Reports and Pavement Designs To ensure proper design of roads and bridges, the department will require the contractor to provide a soils report and associated pavement design. In certain cases, the engineer may waive these 3 requirements. Specific requirements are described in Chapter 9 of this document. N®s � 10.3.6 Materials Rejection NIPMaterials that do not meet the requirements of the approved construction plans and specifications will N.,., be rejected by the inspector. Rejected materials will be removed from the right-of-way in a timely manner at the contractor's sole expense. The contractor may choose to perform additional third -party �o1s ~- materials testing in an effort to reverse the inspectors' decision. However, in no case will rejected iy a_ U — materials be covered up or incorporated into the work without approval. In cases where the contractor and the inspector disagree on a materials rejection issue, the engineer will make the final decision. N P.- mvtzaa aYi� mum 4844875 Pages: 228 of 283 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppas, Clerk and Recorder, Wald County , CO lIII Medlin N Mg, 141 1111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1133 10.4 EXCAVATION AND EMBANKMENT 10.4.1 Utility Trenching and Backfill Requirements All utility trenches underneath or within 5 feet of a public roadway will be backfilled with suitable materials and mechanically compacted to not less than 95 percent of maximum density, as determined by AASHTO T99. This work will require the contractor to arrange and pay for the applicable materials quality control testing. The exception to this requirement is underground utilities that are bored into place or installed by similar methods which do not disturb the surrounding soils. Alternative backfill using an approved flowable cement fill (flow -fill) mix design can be used instead of soil materials, eliminating the need for onsite compaction testing. Weld County Standard Flow -Fill Mix: Slump of 7 to 10 inches - ASTM C143 Compressive Strength F'C-1,000 PSI @ 28 days ASTM 150 Type y e I - II, minimum pounds III 329 d Na3� Course Aggregate ASTM-33—Minimum 1,000 pounds Fine Grain Aggregate ASTM-33—Minimum 2,000 pounds N� oh Air Entraining Agent (SIKA Air) ASTM-C260—Minimum 1.0 oz./cubic yard Noc�37 Water —Minimum 150 pounds All utility trenches located more than 5 feet away from a public roadway will be backfilled with suitable de: materials and mechanically compacted to not less than 90 percent of maximum density, as determined by AASHTO T99. The inspector may choose to waive the requirement for materials testing in these cases .41 IS if s/he believes that proper construction methods are being used to ensure good compaction, or if flow- n a fill is being used. :m,11. The department reserves the right to perform material testing on any utility trench being constructed within the right-of-way. If the material testing performed by the department shows that the contractor has failed to meet or exceed the compaction requirements described above, the contractor will be directed to remove and recompact the backfill and/or pavement materials at its own expense. See Section 10.7.5 for Pavement Cuts and Patching Requirements. 10.4.2 Unsuitable Materials Soil materials used in embankment construction will be as recommended in the approved soils report for the project. Soil materials that do not meet the requirements of the soils report are identified as being "unsuitable materials" and will be removed from the jobsite. Es.; •3 Projects that do not have an approved soils report will follow more general requirements for the materials to be used. Embankment and fill material will be free of ice, organics, trash, glass, chemicals, Ad and other deleterious materials. When tested by a Hveem Stabilometer, the soils will have a minimum yi 12 M R -value of at least R-20 and a maximum dry density of not less than 120 pounds per cubic foot. �a o ti a N _ 10.4.3 Moisture and Density Control ~U .7 Moisture and density control will follow CDOT's Standard Specifications for Road and Bridge �, N o E Construction. rnN�� WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1134 The contractor will be responsible for material testing to confirm that proper construction methods are being used and that the moisture and density requirements are being met. Moisture and density testing requirements may be waived by the inspector in cases where the amount of embankment being constructed is small or the embankment being constructed is not intended to be used for a public roadway. However, the inspector is not authorized to waive or relax the testing requirements described in an approved soils report. 10.5 SUBGRADE CONSTRUCTION METHODS 10.5.1 Unsuitable Materials Suitability of subgrade materials is equal to that described for embankment materials in Section 10.4.2. Subgrade materials that are deemed unsuitable for construction will be removed from the jobsite. 10.5.2 Soft Spots Subgrade areas that cannot be constructed initially to meet compaction requirements or support traffic loads using standard, acceptable construction methods are commonly referred to as "soft spots." Repair of soft spots typically is addressed by first trying methods that require little time and expense, then progressing to more costly methods if necessary. In cases where soft spots are numerous and extensive, where the soft spots are so bad that standard construction equipment cannot access the area, or where soft spots present a dangerous work condition, the contractor will consult a Professional Engineer or Professional Geologist for recommendations for proper construction methods. The following are some of the methods used to repair soft spots: • Scarifying/drying/blending the onsite soils and then recompacting • Over -excavating and backfilling with suitable onsite soils • Over -excavating and backfilling with imported granular fill Over -excavating and placing geogrid or geotextiles, then backfilling with imported granular fill Subgrade treatment of onsite soils with cement, fly ash, or other approved materials The success or failure of any of these methods will be determined by extensive proof rolling and inspection. 10.5.3 Moisture and Density Control Subgrade moisture and compaction requirements are similar to the requirements for embankments but are a little more stringent since subgrade materials are a component of the overall roadway structural section. If the subgrade materials fail to meet the conditions required in the overall pavement design, the aggregate base and pavement sections are likely to fail prematurely. Moisture and density control for subgrade will follow CDOT's Standard Specifications for Road and Bridge Construction. The contractor will be responsible for material testing to confirm that proper construction methods are being used and that the moisture and density requirements are being met. When the final subgrade surface elevations have been established, proofrolling and inspection will be performed before any aggregate base is placed on top of the subgrade. 10.5.4 Subgrade Proof Rolling The department requires proof rolling of subgrade materials, observed by the inspector, to determine their adequacy to support heavy loads. This work typically is accomplished with a heavy rubber -tire WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1135 truck, such as a water truck, that can generate a minimum axle load of 18,000 pounds per axle. The inspector may require the contractor to provide a certified weight ticket as proof that adequate proof rolling equipment is being used. The subgrade will be proof rolled after the required compaction has been verified with materials testing equipment and the subgrade has been graded to the required elevations called for in the plans. The inspector will be notified at least 48 hours prior to any subgrade proof rolling. No proof rolling will be accepted without the inspector or designee present. Upon approval of the proof rolling, the contractor will place the aggregate base course on top of the approved subgrade materials within 48 hours. If the contractor fails to place the aggregate base course within 48 hours or the moisture conditions of the subgrade change due to inclement weather or other conditions, proof rolling will need to be repeated. 10.5.5 Treated Subgrades Subgrade soils can be treated with cement, fly ash, lime, or other approved stabilizing agents. This approach is a cost-effective way to avoid over -excavation of unsuitable soils over large areas. Subgrade treatment also is used to raise the structural value of the soils, thereby allowing the designer to require less thickness of aggregate base course and pavement. Another reason for the use of stabilizing agents is to reduce the swell potential of certain clay soils. Specific moisture and density control requirements vary, depending on the type of stabilizing agent used. Prior to placement of any subgrade treatment, the contractor will submit a mix design to the inspector for approval. The contractor also will supply the inspector with information regarding the type of delivery, mixing, watering, grading, and compaction equipment to be used during construction. 10.6 BASE COURSE CONSTRUCTION METHODS 10.6.1 Gradation and Moisture and Density Control Overall pavement quality, including structural longevity and riding smoothness, is greatly affected by the quality of the underlying subgrade and base course materials. Base course materials must meet specified gradation and moisture and density control requirements to adequately support the traffic loads. The department requires a minimum of 4 inches of compacted aggregate base course underneath - any permanent paved road surface. Depending on the pavement design, subgrade R -value, predicted ▪ traffic loading, and other applicable factors, greater thicknesses of aggregate base course often are `� required. The base course provides the pavement structure with a free -draining, non -frost -susceptible material layer that distributes the traffic loads from the pavement surface to the underlying subgrade. o � ,n a Aggregates for bases will be crushed rock, native or crushed gravels, crushed recycled concrete, or N�3 crushed recycled asphalt materials. Base course gradation will be as specified in CDOT Specifications: o4 Class 5 or Class 6 materials. Class 6 Aggregate Base Course typically is used for areas directly underneath c°°.iLL o the permanent paved surface. Class 5 Aggregate Base Course typically is used for "shouldering" the r- areas adjacent to the edges of the permanent paved surface. Shouldering materials shall not contain crushed or recycled concrete materials. Prior to any placement of materials, the contractor will submit a aN ; laboratory gradation test to the inspector verifying specifications are being met. The contractor also will �i grant the inspector access to any stockpiles or sources of base course to be used on the project. N rN O lO�Y� v. 61C III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1136 The maximum compacted thickness of any individual lift of base course will not exceed 6 inches. Multiple lifts will be required when the thickness is greater than 6 inches. Compaction of each layer will meet a density of at least 95 percent of the maximum density determined in accordance with AASHTO T- 180. Water should be uniformly applied to ensure this compaction requirement has been met. The final surface elevations of the base course will be graded to within .04' of the elevations specified on the plans. Placement shall be performed utilizing side -dump or belly dump haul equipment. With the exception of smaller area placement where material can be placed with little segregation using loader or skid steer equipment. Mixing, moisture conditioning and grading shall be done with rubber -tired equipment to prevent breakdown of aggregate and gradation. End dumping and Dozer grading is not allowed unless authorized by a Weld County Engineer. If material is stockpiled for any length of time, care should be taken in the maintenance of the pile to prevent segregation of the material. oe10.6.2 Base Course Proof Rolling The department requires proof rolling of base course materials under observation of the inspector to determine the adequacy to support heavy loads. This work typically is accomplished with a heavy rubber -tire truck, such as a water truck, that can generate a minimum axle load of 18,000 pounds per ID Na3 axle. The inspector may require the contractor to provide a certified weight ticket as proof that om� adequate proof rolling equipment is being used. The base course will be proof rolled after the required cp •'12Am compaction has been verified with materials testing equipment and the base course has been graded to NLLo� Na�H the required elevations called for on the approved construction plans. pa rT The inspector will be notified at least 48 hours prior to any base course proof rolling. No proof rolling dt°2 will be accepted without the inspector or designee present. 10.6.3 Treated Base Courses Base courses can be treated with cement to obtain a stiffer and stronger material than an unbound base. A stiffer base reduces deflections due to traffic loads, which results in lower strains on the pavement surface. This approach can be a cost -saving measure that allows the designer to require less thickness of pavement. Cement -treated bases need to be designed for each specific project. The structural properties of cement -treated base depend on the soil/aggregate material, quantity of cement, curing conditions, and age. The contractor will be responsible for submitting a mix design to the inspector for review and approval prior to construction. Specific moisture and density control requirements vary, depending on the cement -treated base mix design. In addition to having an approved mix design, samples of the cement -treated base will be taken during construction, and laboratory tests will be conducted to verify that the minimum strength properties specified have been achieved. The contractor also will supply the inspector with information regarding the types of delivery, mixing, watering, grading, and compaction equipment to be used during construction. In addition, the inspector may require copies of certified weight tickets for the cement to verify proper quantities have been incorporated into the base course. All testing of processed cement - treated base material or its individual components, unless otherwise provided specifically in the approved construction plans and specifications, will be in accordance with the latest applicable AASHTO or ASTM material specifications. The final surface elevations of the cement -treated base course will be graded to within one -quarter inch of the elevations specified on the plans. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1137 10.6.4 Acceptance Prior to Paving Upon approval of the proof rolling, the contractor will place the pavement surface (if applicable) on top of the approved base course materials within 48 hours. If the contractor fails to place the pavement surface within 48 hours or the moisture conditions of the base course change due to inclement weather, excessive drying, or other conditions, proof rolling will need to be repeated. The inspector is responsible for giving the contractor final approval to proceed with placement of the pavement surface on roads and bridges within the right-of-way. The contractor will furnish copies of ME certified load tickets for the base course materials as proof that the correct type and quantity of base course was delivered to the jobsite. When the inspector determines that base course placement is 82 acceptable, a pre -paving meeting can be held. 10.7 PAVEMENT CONSTRUCTION METHODS (3... 10.7.1 Pre -Paving Meetings Nee, Pre -paving meetings are mandatory on any road or bridge project that requires placement of asphalt or 0,;-,3-0— concrete permanent pavement more than 500 tons of HMA Pavement or 2,000 SY of Concrete a •`� Pavement. The meetings will be scheduled and arranged with the inspector. Attendees at the pre -paving VA meeting generally include the contractor superintendent, paving foreman, materials quality control 1553 tester, TCS, material supplier representative, engineer, and inspector. The asphalt or concrete mix design will be submitted, reviewed, and approved by the inspector prior to the pre -paving meeting. Pre -paving meetings typically are held on the jobsite. Following is a partial list of the general items for ooNo discussion: n ;Y� ~S'_ Introductions and attendance roster with contact information 5a:sis Assignment of specific duties Scheduling, construction sequencing, and traffic control requirements Materials quality control methods and requirements Types of hauling equipment and paving equipment to be used Construction details, such as lift thicknesses, joint construction, and pavement striping Conditions under which paving will cease (bad weather, darkness, holidays, etc.) 10.7.2 Recycled Asphalt Pavement Surfaces y3 Weld County has constructed roads using recycled asphalt pavement (RAP) as the pavement surface for interim cross sections instead of gravel. This typically is accomplished as a permanent means of dust Nm �-� control and is less costly than HMA. Candidate roads for RAP pavement are gravel roads that have a high 3 enough ADT to make grading and dust control maintenance a significant effort, but low enough ADT to not warrant permanent HMA pavement placement. 10.7.3 Hot Mix Asphalt Surfaces wE 2Most County roads with permanent paved surfaces are constructed with HMA. This type of surfacing Y. N;, suits the County needs well since our road crews are knowledgeable and well equipped to properly 2 -' maintain asphalt roads. N QS r N g The current edition of the CDOT Standard Specifications for Road and Bridge Construction, Sections 400, 403, 702 and 703 provide material specifications and construction methods generally acceptable to WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1138 Weld County. Table 9-8 has the Master Range gradation requirements for Grading S (N") on bottom, intermediate lifts and SX (%") for top lift placement are acceptable. Designs will require Performance Graded Binder of 64-22 on bottom and intermediate lifts, while top lifts will have 64-28 (Table 702-1 in COOT'S Standard Specifications for Road and Bridge Construction), other binder grades must be approved in writing by Weld County Engineer. Design air voids will be targeted at 3.5-4.5% under 100 gyrations. No more than 20% Recycled Asphalt may be used in the bottom and intermediate lifts. Top IN lift will utilize virgin aggregate in the mix design. No asphalt shingles can be used in the recycled asphalt products. G Prior to any asphalt placement, the contactor will submit an asphalt mix design to the inspector for approval, as described in Section 401.02(a) (1) and (2) of the COOT Standard Specifications. The inspector reserves the right to perform a site visit and inspect the facilities of any asphalt supplier of „ _ Na;& used. During construction, the contractor will furnish copies of certified load tickets for the pavement -3 y •�� -Qs materials as proof that the correct type and quantity of pavement materials were delivered to the o .+ L� jobsite. N�� N The minimum and maximum layer thickness will be as specified by CDOT Specifications for the type of a`+-3 asphalt mix being used, or as otherwise specified in an approved pavement design report. The use of a .; geosynthetics associated with asphalt pavement or mill/overlay operations will be approved by the engineer prior to use. iC ape`V 10.7.4 Concrete (PCCP) Surfaces 1`1m.m PCCP construction is encouraged for high -volume intersections, industrial developments, and heavy vr2SIM truck routes. CDOT Specifications Section 412 provides material specifications and construction methods generally acceptable to the department. Prior to any concrete placement, the contactor shall submit construction plans which follow all the requirements in this guide but also include a joint layout plan and a construction phasing plan. The following standards including but not limited to the following shall be included in the project: I 1. The Contractor shall also submit an optimized gradation concrete mix design to be reviewed and 8- approved by the County. a 2. A PCCP design shall be provided using the mechanistic empirical (ME) design criteria. If the ai recommended pavement thickness is less than 9 inches, the minimum concrete thickness shall m- be 9 inches. If the recommended concrete pavement thickness is more than 9 inches, the N3 greater thickness shall be used. The minimum thickness of Class 6 ABC is 6 inches unless a of greater thickness is recommended by the design. 2LL �' N: 3. A minimum of 1 layer of Tensar INTERAX NX650 geogrid or approved equivalent shall be placed v� beneath the Class 6 ABC and the subgrade on all PCCP project. The manufacturer's iirequirements for overlap shall be followed. Additional layers of INTERAX NX650 shall be 1.:1'17 required if stability and compaction of the subgrade cannot be achieved. �" 4. The concrete mix design shall contain no more than 20% fly -ash g aV 5. Only non -chloride High early strength concrete mix designs may be used in some situations if ,5:74),1-2 submitted and approved by the County prior to construction. it 6. All acceleration and deceleration lanes shall have a 4 -foot PCCP shoulder and a 2 -foot gravel �m�� shoulder. The gravel shoulder shall be composed of either Class 6 ABC or RAP. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1139 7. All other PCCP travel lanes shall have an 8 -foot PCCP shoulder and a 2 -gravel shoulder. 8. A safety edge is required for the full length of the PCCP lanes except at driveway locations. 9. If an existing PCCP road is being widened, the existing safety edge and shoulder shall be removed prior to the construction of additional lanes. The additional lanes shall be constructed with a safety edge. 10. The minimum 28 -day flexural strength for concrete paving shall be a minimum of 650 psi. Any concrete paving found to be less than this shall be removed and replaced. 11. All other material submittals such as aggregates, cement, joint sealant, curing compound, dowel bars, and tie bars shall be approved by the County prior to any concrete being placed. 12. Non -flexible fusion bonded epoxy coated (purple or black) carbon steel bars (dowels) shall be used in the wheel paths for load transfer between panels. The Simplex Time Capsule or ArmorCoat dowel bars are acceptable. 13. Dowel bar sizes vary depending on pavement thickness and expecting loading. Never to be less than 1.25". 14. All epoxy coated Tie Bars used in concrete pavement jointing will have no bare steel ends and require coating of epoxy paint prior to placement. 15. The transition between PCCP and HMA shall follow the Weld County PCCP to HMA transition detail. 16. Concrete paving shall be finished using a moistened doubled burlap drag for texture. Concrete texturing shall occur prior to curing compound being placed. 17. All non-standard sized concrete panels shall be reinforced with 6 -gauge welded wire mesh 18. Concrete curing compound shall be White Water Linseed Oil Concrete Curing and Anti-spalling Compound or approved equivalent. 19. Joint sealant shall be Dow Corning 890 SL joint sealant or approved equivalent. 20. Pavement markings placed onto finished concrete pavement shall follow Table 10-1 below. Table 10-1 Pavement Marking Types on Asphalt and Concrete Roadways Surface Type Line Type Material Type CDOT ITEM # Existing Asphalt 6" White Edge Line Modified Epoxy 627-00008 4" Yellow Edge Line Modified Epoxy 627-00008 4" Double -Yellow Centerline Modified Epoxy 627-00008 4" White Extension Line Modified Epoxy 627-00008 4" White Skip Lane Line Modified Epoxy 627-00008 8" White Gore Area Modified Epoxy 627-00008 8" White Channelizer Modified Epoxy 627-00008 8" White Lane Drop Modified Epoxy 627-00008 8" White Double -Left Guide Modified Epoxy 627-00008 Stop Bar/Xwalk Preformed Thermoplastic (Inlaid) or Preformed Plastic Type I (Inlaid) 627-30411 or 627-30328 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (140 Word Message/Symbol Preformed Thermoplastic (Inlaid) or Preformed Plastic Type I (Inlaid) 627-30407 or 627-30323 New Asphalt 6" White Edge Line Modified Epoxy 627-00008 4" Yellow Edge Line Modified Epoxy 627-00008 4" Double -Yellow Centerline Modified Epoxy 627-00008 4" White Extension Line Modified Epoxy 627-00008 4" White Skip Lane Line Modified Epoxy 627-00008 8" White Gore Area Modified Epoxy 627-00008 8" White Channelizer Modified Epoxy 627-00008 8" White Lane Drop Modified Epoxy 627-00008 8" White Double -Left Guide Modified Epoxy 627-00008 Stop Bar/Xwalk Preformed Thermoplastic (Inlaid) or Preformed Plastic Type I (Inlaid) 627-30411 or 627-30328 Word Message/Symbol Preformed Thermoplastic (Inlaid) or Preformed Plastic Type I (Inlaid) 627-30407 or 627-30323 Existing & New Concrete 6" White Edge Line Preformed Plastic Type II (Inlaid) 627-02010 4" Yellow Edge Line Modified Epoxy 627-00008 4" Double -Yellow Centerline Modified Epoxy 627-00008 4" White Extension Line Modified Epoxy 627-00008 4" White Skip Lane Line Preformed Plastic Type II (Inlaid) 627-02010 8" White Gore Area Modified Epoxy 627-00008 8" White Channelizer Preformed Plastic Type II (Inlaid) 627-02010 8" White Lane Drop Preformed Plastic Type II (Inlaid) 627-02010 8" White Double -Left Guide Preformed Plastic Type II (Inlaid) 627-02010 Stop Bar/Xwalk Preformed Thermoplastic (Inlaid) or Preformed Plastic Type I (Inlaid) 627-30411 or 627-30328 Word Message/Symbol Preformed Thermoplastic (Inlaid) or Preformed Plastic Type I (Inlaid) 627-30407 or 627-30323 Rollover Curb in Roundabouts Modified Epoxy — Yellow with reflective beads 627-00008 21. For epoxy pavement markings, the concrete curing compound must be removed along the marking layouts prior to placement of the epoxy. This can be accomplished using pressurized water or other methods as approved by the County. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1141 The County reserves the right to perform a site visit and inspect the facilities of any material supplier used during construction. The contractor shall furnish copies of certified load tickets for the pavement materials as proof that the correct type and quantity of pavement materials were delivered to the jobsite. Traffic control requirements for PCCP construction are a major concern because of the concrete curing time requirements. 10.7.5 Pavement Cut and Patching Requirements Some roadways in Weld County have a "No Cut" policy in place. Consult with the Public Works Department to find out which roads fall under this policy. Construction work that requires removal of existing paved surfaces will require replacement with similar new pavement materials within a period of 48 hours, unless otherwise approved by the inspector. Traffic control devices will not be removed until after the paved surface has been replaced. Removed RAP surfaces will be replaced with HMA. Where pavement is to abut existing pavement, the existing pavement shall be removes to a neat vertical line, using a saw or other method as approved, to create a clean construction "T -Joint". The contractor will also be required to paint the edge with diluted emulsified asphalt (slow setting) prior to paving operations. The rate of application shall be as determined by the engineer at the time of application. Contractor shall mill existing roadway to a minimum depth of 2 inches. The milling shall be a minimum of 2 feet wide or a greater width so that the joint will not fall within the intersecting travel lane wheel path. Construction in the winter will require temporary asphalt patching using cold -mix materials, then returning to the site to reconstruct with permanent patching using hot -mix materials when weather conditions allow. All pavement removals will be saw -cut a minimum of 1 foot wider than the patching area. The new pavement patch material will be placed and compacted to a thickness at least 1 inch greater than the adjacent in -place pavement. The minimum dimension of both length and width of any pavement patch will be at least 4 feet to ensure adequate compaction can be obtained. The inspector may choose to waive the requirement for pavement surface materials testing if they believe that proper construction methods are being used to ensure good compaction. Pavement cut and patching requirements for concrete pavements will require review and approval by the inspector. Concrete patching typically requires insertion of steel dowel bars into the adjacent pavement. Proper curing and jointing methods also must be used. Improper construction of pavement patches is a problem in Weld County. Poor construction methods may result in dangerous bumps or dips in the traveled roadway. If such conditions are identified by the department within two years after construction, the contractor will be notified in writing to reconstruct the pavement patch properly. Failure to meet the conditions described in the written notice from the department can result in emergency repairs being performed by County crews. In such cases, the contractor will be invoiced to reimburse the County for all costs associated with the road repairs. 4944675 Pages: 234 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Weld County , CO VIII growl K ti h w:I : o' i � l �b:l�W�k Bill WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (142 10.8 STRUCTURES AND DRAINAGE FEATURES 10.8.1 Bridges Unless otherwise approved by the engineer, bridges will be designed and constructed according to the most current requirements of AASHTO's LRFD Bridge Design Specifications, CDOT's Bridge Design Manual, CDOT Standard Specifications, and CDOT Standard Plans. If alternate designs or construction methods are being proposed by the contractor, the engineer will provide specific submittal requirements. The design and construction of any bridge within the County right-of-way will be overseen by a Professional Engineer licensed in the state of Colorado. 10.8.2 Culvert and Pipe Installation Culvert and pipe installation will be completed according to the requirements of CDOT Specifications Section 603 and Standard Plans, unless otherwise described in Chapter 5.6.4 and Chapter 5.8 of this document. Pipes constructed in right-of-way for private driveway access in rural areas will be at least CMP, or an approved equal, and will have a minimum diameter of 15 inches. Pipes constructed under the travel lanes of a new public roadway will be RCP, or an approved equal, and will have a minimum diameter of 15 inches. All culverts and pipes must be installed with a minimum of 12 inches of cover above the pipe crown and bell to the bottom of asphalt at the edge of pavement (for paved roads) and a minimum of 12 inches of cover above the pipe crown to the top of the finished grade (for gravel roads). If 12 inches of cover is not possible, the culvert material must be rated for a minimum of HS -20 loading or the largest expected loads crossing it (i.e., oil rigs, semi -trucks, etc.). The contractor must provide shop drawings for any precast concrete box culvert (CBC), which will be reviewed and approved for use by the engineer. HOPE, ADS, or other plastic pipes that cannot withstand fire will not be allowed. It will be the responsibility of the contractor to protect pipe materials from damage during shipping, unloading, and installation. Any damaged pipe materials (as determined by the inspector) will be removed from the jobsite. The construction elevation tolerance for pipes will be within 0.5 inches of the design elevation called for on the approved plans. 10.8.3 Curbs, Gutters and Crosspans Construction will be according to the requirements of CDOT Specifications Section 609 and Standard Plans, or as otherwise described in Chapter 5 of this document. All curbs, gutters, and crosspans will be constructed of CDOT Class D concrete or an approved equal. All gutters and cross pans shall be 8" thick, minimum. Asphalt curbs are permitted for bridge construction only. All outflow curb and gutter will be CDOT Type 2 —Section IB, unless otherwise approved. All inflow curb and gutter will be CDOT Type 2 —Section IIB, unless otherwise approved. All mountable curb shall be CDOT Type 2 Section IM or Section IIM, unless otherwise approved. All crosspans will be CDOT Gutter Type 2 with a minimum thickness of 6 inches, unless otherwise approved. The minimum vertical slope for all gutters and crosspans will be 0.5 percent. Minimum width of 8 feet. 4944678 Pagss: 235 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Wald County , Co VIII MR HM14 1111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE (143 10.8.4 Concrete Structures, Manholes, and Inlets Construction will be according to the requirements of CDOT Specifications Section 601 and Standard Plans, or as otherwise described in Chapter 5.6 of this document. All irrigation structures will be reviewed and approved by the applicable irrigation company or board prior to construction. All concrete structures, manholes, and inlets will be constructed with steel reinforcement as shown on the approved construction plans. The contractor will be responsible for concrete quality control testing for all cast -in -place concrete construction. The contractor will request an inspection of the concrete formwork by the inspector a minimum of 24 hours prior to concrete placement. 10.8.5 Retaining Walls and Slope Stabilization Measures Any retaining walls 4 feet tall or higher that are to be constructed in the right-of-way will be designed (and designs will be stamped) by a Professional Engineer licensed in the state of Colorado. The contractor will submit detailed plans for approval by the department prior to construction. Retaining wall foundations must follow the recommendations provided by the geotechnical engineer. Modular block retaining walls will be constructed per the manufacturer's specifications. Retaining walls will be located such that they ensure adequate clear distance from the wall to the edge of the roadway and so do not pose a risk to the traveling public. Any retaining wall constructed in an urban or residential area and greater than 4 feet in height will incorporate a railing or fence for fall protection. Non-structural erosion control measures for slopes (blankets, turf reinforcement mats, etc.) will be installed per the manufacturer's specifications. Structural slope stabilization measures (riprap, gabions, soil anchors, slope mattresses, etc.) will be designed, and designs will be stamped, by a Professional Engineer licensed in the state of Colorado. The contractor will submit detailed plans for approval by the department prior to construction. 10.9 OTHER ROADWAY FEATURES 10.9.1 Pavement Markings All roadways and bridges constructed will receive permanent pavement markings (striping) prior to the construction traffic control devices being removed. The contractor will ensure that all pavement markings have been designed and located according to the requirements of the MUTCD. All permanent line striping will be done with epoxy paint materials applied according to the manufacturer - recommended methods at 15 mils minimum thickness, unless otherwise approved by the department. Both pavement and air temperatures will be at least 50 degrees and rising at the time of pavement marking. All permanent words, symbols, stop bars, crosswalks, etc., will be pre -formed thermoplastic pavement markings capable of being affixed to the asphalt pavement surface by heating, unless otherwise approved by the department. The minimum pavement and air temperature will be as recommended by the manufacturer. The contractor will submit a copy of the manufacturer installation recommendations to the inspector prior to application. 10.9.2 Traffic Control Devices (Signs and Signals) Installation of all permanent traffic control devices within the right-of-way is to be approved and overseen by the department. Traffic control device materials and manufacturers will meet the requirements of CDOT Specifications Section 713 and the latest version of the MUTCD. Installation of WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1144 traffic control devices will meet the requirements of CDOT Specifications Section 614 and the latest version of the MUTCD. Construction of traffic signals within the right-of-way with the intention of turning over ownership of the traffic signal to the County will require specific design guidance and approval by the department. 10.9.3 Trees and Plantings Weld County does not encourage the placement of any trees or plantings within the right-of-way that require an irrigation system. Any trees or plantings proposed to be used will be able to survive under non -irrigated conditions. Trees and plantings will be located such that they do not present a safety hazard to the traveling public by ensuring adequate clear zone distance from the trees and plantings to the edge of the roadway. Trees and plantings will be of the species and varieties previously approved for use by the department. The contractor will obtain certificates of inspection of plant materials that are required by federal, state, or local laws, and will submit the certificates to the department for approval prior to planting. All delivered plant materials will be free from plant diseases and insect pests. All plant materials are subject to the two-year warranty period. The contractor is responsible for removing and replacing any dead plant materials that have been identified by the department prior to the end of the warranty period. 10.9.4 Sidewalks and Trails Any permanent sidewalk, bikeway, or trail within the right-of-way will be constructed with concrete or HMA, with a minimum thickness of 4 inches. The minimum width of the completed surface will be 5 feet. All completed surfaces will have a maximum cross slope of 1.8 percent to ensure proper drainage and comply with the Americans with Disabilities Act (ADA). Sidewalks will be constructed with concrete curb ramps and will comply with ADA requirements. Before any surfacing is placed, clearing and grubbing, tree removal, grass and brush removal, and topsoil removal will be completed. The existing ground then will be thoroughly compacted to not less than 90 percent of maximum density as determined by AASHTO T99. Materials testing requirements may be waived by the inspector if the amount of sidewalk being constructed is minimal or the construction methods being used are obviously adequate to ensure required results. 10.9.5 Guardrails All new guardrail placed within the right-of-way will be CDOT Midwest Guardrail System (MGS). Any contractor installing guardrail will be pre -qualified with CDOT for this specific type of construction (work type 14). The contractor will be responsible for providing and maintaining traffic control devices until the guardrail construction has been entirely completed, inspected, and approved for use by the inspector. 10.9.6 Fences New fences constructed within the right-of-way will be in accordance with CDOT Specifications Section 607 and Standard Plans No. M-607-1 (Wire Fences and Gates). In cases where a contractor is replacing an existing fence, the adjacent landowner and the inspector should be consulted regarding acceptable fencing materials. In all cases, the contractor will obtain permission to enter upon adjacent private land. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1145 Construction of fences intended to be located on the right-of-way line will be surveyed and staked prior to construction. If the locations of the right-of-way line or adjacent property lines are in question, the department will be consulted for assistance. All fences will be designed and constructed in a manner that does not adversely impact the sight distance for vehicles, especially near roadway intersections. In urban or developed areas, standard barbed-wire fences are not the preferred type. Developers and landowners can make use of many other fence types that will better fit the needs. The department will be consulted and will review specific requests prior to construction. The contractor will perform clearing and grubbing as necessary to construct the fence to the required grade and alignment. At locations where fence posts or anchors need to be imbedded in concrete, adequate bracing will be left in place until the concrete has hardened. The tops of all posts will be set to the required grade and alignment. Avoid cutting off the tops of treated wooden posts. All gates will be galvanized steel or factory -painted, unless otherwise approved. 10.9.7 Cattle Guards In Weld County, cattle guards are used to keep cattle or other grazing animals off the right-of-way. New cattle guards constructed within the right-of-way will be in accordance with CDOT Specifications Section 611 and Standard Plans No. M-611-1 (Cattle Guard). A written agreement similar to the agreement found in Appendix 8-C of the Weld County Code must be received by the Public Works Department prior to installation. The contractor will obtain permission to enter upon adjacent private land, if necessary, for construction and will make arrangements for temporary access with the affected landowner(s). The deck area of all cattle guards will be constructed of steel, and all hardware will be galvanized steel. The contractor will ensure that concrete has sufficient time for curing and strength gain prior to allowing traffic to use the new cattle guard. The contractor will be responsible for providing a temporary means of controlling cattle or other grazing animals during construction. 4947889 Paws: 238 of 285 03/05/2024 11:15 AM R Faa:$0.00 Carly Kopper,, Clerk and Recorder, Wald County , CO NAL f Welk till 4944875 Pogo.: 238 of 285 02/15/2024 12:24 PM R Faa:$0.00 Carly Kopper, Clark and Recorder, Wald County , CO VIII IN��IIM21 M�f I '14� lhfdtik DWI hi 41� ii 1I II WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1146 CHAPTER 11 PERMITTING The following permits are issued by the Public Works Department or the Planning and Zoning Department, as indicated. Additional information regarding any of the permits, including application forms, can be found on the Weld County website. 11.1 TRANSPORT PERMIT The Transport Permit is issued by the Public Works Department and is required when vehicles using the County road network are overweight, over -sized, or both. It is issued for standard overweight or over- sized load vehicles and for oil rigs drilling in the County. Permit conditions or restrictions may apply to these vehicles and are listed on the application form. When a permit for this application is issued by Weld County, the permit is subject to the conditions described with the understanding that no liability is assumed by Weld County by reason of its issuance. With regard to the condition of roads or capacity of culverts and bridges, the applicant must examine and inspect the adequacy of roads and bridges for traffic movement. In case of an emergency, an authorized Weld County employee or an authorized agent may suspend the permit until emergency conditions have passed. (See Weld County Code, Chapter 8, Article XV, Sec. 8-15-10, et seq.) 11.2 RIGHT-OF-WAY USE PERMIT The Right -of -Way Use Permit, issued by the Public Works Department, is a tool to help regulate unauthorized obstructions of, excavations in, and use of the County's rights of way and easements by requiring permits for all construction activities within the Weld County rights of way or easement and provide for the subsequent restoration upon completions. A Right -of -Way Use Permit grants a permit holder permission to occupy, excavate, survey, perform locations, or construct facilities within the County rights of way or easements and provide for the subsequent restoration upon completion. (See Weld County Code, Chapter 8, Article XIII, Sec. 8-13-10, et seq.) Right-of-way Use Permit instructions and application can be found at: https://www.weld.gov/Government/Departments/Public-Works/Permits/Right-of-Way-Permits. 11.3 ACCESS PERMIT 3 Land use, natural resources recovery,general utilities, and development have impacts on County roads. ��P P The requirement for Access Permits, issued by the Public Works Department, recognizes that the efficiency and safety of County roads depends on minimizing roadside interference and its detrimental effect upon the movement of traffic. The Access Permit sets out minimum requirements for the design, construction, and maintenance of accesses. (See Weld County Code, Chapter 8, Article XIV, Sec. 8-14-10, oL� eq.) � vex NLL m� 11.4 GRADING PERMIT �a �z The Grading Permit, issued by the Public Works Department, is a tool to ensure that the County has r4.reviewed the grading plan, the erosion and sediment control plan, and the utility map for proposed �`" construction activities with the goal of avoiding potential damages. A Grading Permit grants the Permit Holder permission to conduct construction activities within the requirements of applicable state mRD regulations and provides the County with sufficient oversight to minimize the potential for offsite . damages. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1147 A Grading Permit will be required if disturbing more than one acre or any earth disturbance in an MS4 area per the MS4 criteria within this document. (See Weld County Code, Chapter 8, Article XII, Sec. 8-12- 10, et sec{.) 11.5 FLOODPLAIN DEVELOPMENT PERMIT The Floodplain Development Permit is issued by the Planning and Zoning Department. (See Weld County Code, Chapter 23, Article XI, Sec. 23-11-200, et seq.) 4947569 Pages: 240 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Kappa., Clark and Recorder, Wald County , CO 11111 liMdl iK' MON c logLI t.l11 41 fiM0uC IY�I� �� 4944675 Pages: 240 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Wald County , CO II FAN� � ti l IYSIK.ti+N4:'rh 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1148 CHAPTER 12 VARIANCE REQUESTS The County recognizes that in certain limited instances it may be exceptionally difficult to conform to the criteria set forth in this manual and the Weld County Code. The County will consider requests for variances on a case -by -case basis. The variance request will be submitted in a written attachment to the initial submittal of construction plans. Drainage variances are addressed in Section 8-11-160 of the Weld County Code. All other requests will consist of the following: 1. Identification of the criteria or Weld County Code section to be waived or varied 2. Identification of the construction criteria adhered to 3. Justification for the variance, which will demonstrate the following: Hardship is created if the variance is not approved. The hardship shall be specific to the subject property, rather than general in nature, such as cost, and shall not have been self- imposed by the applicant or their predecessors in title to the property. There will be only minimal impact on public safety. The variance is not contrary to best engineering practices. The variance is not contrary to the intent and general purpose of these criteria and the Weld County Code. The variance does not result in a significant impact to the public due to maintenance of the improvement. The variance does not result in a significant impact to the aesthetic appearance of the improvement. The variance is the minimum exception from the criteria necessary to afford relief from the hardship. The variance is reasonably necessary for the health, safety, and welfare of the public. The variance request shall be prepared, stamped, signed, and dated by a professional civil engineer licensed to practice in the State of Colorado. Requests will be reviewed by the Public Works and/or Planning Services Director or his/her designee. The Public Works Director, or his or her designee, shall only approve the variance request if the applicant has demonstrated the justification required above. The Public Works and/or Planning Services Director or his/her designee reserves the right to deny, or allow his or her designee to deny, any request for variance if doing so is in the interest of public health, safety, and welfare. 4947569 Pages: 241 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Kappaa, Clark and Recorder, Wald County , CO IIIII IYU� KtilthRiliNIfi fA 11111 4944675 1/24 12:24 sPM R Fie $ of 285 Carly Kappaa, Clark and Recorder, Wald County , CO IIIII !PAU �'Mh M�aM�l4ti 4i R it: RAW 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 149 This page intentionally left blank. 4947569/0 24 11:15 Pages: R2 Fig $ of 285 0 Carly Koons., Clerk and Recorder, Weld County CO IIII PAM hil:10t "4l1,414 till 4944675 Pages: 242 of 285 CarlyaComm ,l Clerk and Recorde ,,O Weld County , CO IIIII MN!, �rh��lh CiV MIVi'I tiII 4PVGIYMIti !Mill WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 150 APPENDIX A Weld County Drainage Basin Map 4847688 Pages: 243 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Kopp.., Clerk and Recorder, Wald County , CO VIII NW& VIIIIII W,iitiCk 11111 4844875 Pages: 243 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppp , Clork and Raoordar, Wold County CO Bpi WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA. 4944675 Pages: 244 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppes. Clerk and Recorder. Weld County CO III Eirrdriliki JI�� 4947569 Pages: 244 of 288 03/05/2024 11:15 AM R Fee:$0.00 Carly Kopp's, Clark and Recorder, Weld County , CO III 0411i ILCINNP Ai leR1 III III I IVP4 Re7M R&M 13 15 17 19 21 13 75 27 29 112 110 1pe lee ;wpm 102 ICA) 'S. j ....%—: mi..w. . r•=s ft .i' sfa •r r iNgn .J. .y ... !... r, ... ..e......... t ...... s... 11 7, tit, • 6666 1 V 5 7 ae Sri 24 irbilCuPC7I5 RatlOr 22 t :.N 20 ib 15 t4 I I) IN 5 a Sins Elder Cnselt Lost Cnx k.. . ... I - i 1 .. e. ,.. • .1.,....... H. _late i t • j. IIe 44444 satin $1111111. U;. ■ t `1` CS• — Saneora Draw 9 it 13 15 17 tD 21 13 i5 it :7 Pele or ern NUM • • e 91 77 79 Is-. South Pawns,* Creek Wildcat CroeA TM 62 eu 5e Se 54 52 V, 45 n t 4 to 38 it, 34 32 30 1 •M T.w 26 24 22 20 T N 18 t6 11 12 10 6 tm 0 4 i • '-'n Weld County Drainage Basin Map Legend NN ',AVM a. a. lame Drainage Basin Boundaries Card Paps cca' t Or lees LWr1 Vert Oran r-a.a Ctwt f... 1... Ms trees tee. rims MOM Pawn G•ee U .1W en.ta.. tame Santoro the. Snot Ores _ S...n P...w l.••. 50.711 C4 *TM 7i.fIld JSOON C•.NV -a«ttw Crest tin, 1a1rf a1(.ntr. Map Produced By Weld County Public WOM1; February 2010 on. 41„ COLORADO 4 ®.9 2 3 4 5 ■ — a� Mari MS Miles — �� swear, ,•-••• IS L... ....tan. '4 • •••••f •••1�..V..1. a. ��..r N.�� -rase' . • soon sot eat Y: �r.t.�M. �aut.avn. a r..n a a, -fl .w..� IIPV• ..�a. 0+...rY.t •..Meer. i1. M1MYM.VIM•.Hh•..I/ leek \.6I innine • •r....•.•.e.... �Sr.••••• ..� . m• 117 III) 106 N.46 104 102 Itw rw W ty( tau 88 be 44 42 1:!1 .•r I 1-(rt. T9N 14N e6 t !N 1a 7b rt APPEIVDIX B - Drainage Report Checklist 4947589 Pages: 245 of 285 03/05/2024 11:15 AM R Fee:$0.00 1111 .lRW;r��t� �e« n�� Zr BIN 4944875 Pages: 245 of 285 02/15/2024 12:24 PM R Fee:;0.00 Coyly Koppn , Clerk and Recorder, Weld County CO 1111 KM& VINIVIIIMifrIONI1 1419 MIA 8111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Drainage Report Checklist Project Name: The purpose of this checklist is to assist the applicant's Engineer with developing a drainage report that supports the intent of the Weld County Code using commonly accepted engineering practices and methodologies. Is the project in the MS4? Yes _ Report Content Weld County Case Number Certificate of Compliance signed and stamped by a Colorado Licensed PE Description/Scope of Work Location (County Roads, S -T -R) Nearby water features and ownership Total acres vs. developed acres Hydrological soil types/maps FEMA Flood Zones Urbanizing or non -urbanizing Methodologies used for report & analysis (full spectrum is not accepted) Base Design Standard used for permanent control measure design in the MS4 Discussion of offsite drainage routing Conclusion statement indicating that the design will adequately protect public health, safety, and general welfare and have no adverse impacts on public rights -of -way or offsite properties No If yes, the following requirements in blue apply. See Chapter 8, Article IX of the Weld County Code. Hydrology and Hydraulic Analysis Design Storm / Rainfall Information (NOAA Atlas or Local Data) Release Rate calculations Post corstruction site imperviousness Hydrologic calculations (historic & developed basins) Hydraulic calculations for proposed drainage improvements (swales, culverts, riprap, pond, outlet, spillway, WQCV outlet, etc.) Detentioi/WQCV calculations Comments: 4944675 Pages: 246 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO PIM Construction Drawings Stamped by PE Engineering scale & north arrow Property lines, rights -of -way, and easements 1' Contours & elevations (existing & proposed) Pre- and post -development drainage basins Arrows depicting flow direction Time of concentration critical path Drainage design points Improvements labeled Permanent control measure and associated drainage features labeled 'No Build/No Storage', include design volume Cross sections for open channels, profiles for pipes Elevations for inverts, flow lines, top of grates, orifice(s), etc. Pipe specs (size, material, length, slope) Outlet and spillway details Maintenance Plan Frequency of onsite inspections Repairs, if needed Cleaning of sediment and debris Vegetation maintenance 7 Manufacturer maintenance specifications, if applicable Other Required Documents (If Applicable) H Variance Request and documentation— explain hardship, applicable code section, and proposed mitigation. Variances will not be granted for the Base Design Standard requirement in the MS4. 4947569 Pages: 246 of 285 03/05/2024 11:15 AM R Fsa:50.00 Carly Koppes, Clerk and Recorder, Wild County , CO MildWILIMIlilkl INiiI0141111lli 1111 Department of Planning and Zoning I Deve opment Review 1402 N. 17th Avenue. Greeley, CO 80632 Ph: 970-400-6100 www.weld.govlGovernmentlDepartmentslPlanning-and-ZoninglDevelo pment-Review 3/13/2023 2. Once the revised design and drainage report have been submitted, the County may provide additional comments in addition to the ones listed above. Depending on the complexity of the changes made, a full 28 -day review period may be required. 3. Please provide a written response on how the above comments have been addressed when resubmitting the drainage report. Thank -you. 4947569 Pages: 247 of 285 03/05/2024 11:15 AM R Fnn:$0.00 Carly Koppes, Clerk and Recorder, Weld County , CO III lii 4944875 Pages: 247 of 285 02/15/2024 12:24 PM R Fnn:$0.00 Carly Koppes, Clerk and Recorder, Wald County , CO titticalik "Ill Department of Planning and Zoning Development Review 11402 N. 17th Avenue, Greeley, CO 80632 Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Develo pment-Review 3/13/2023 APPENDIX C - CDOT Operations and Maintenance Plan Guidelines 4947569 5 24 11,15 Pages: R F0a $0 285 Carly Koppas, Clark and Raoordar, Wald County CO 111111 4944675 Pages: 248 of 285 02/15/2024 12:24 PM R Faa:$0.00 Carly Koppas, Clark and Raoordar, Wald County , CO IIII FAIN tiNel Gc M moicamayal WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Aso COLORADO Department of Transportation Preparation Guidelines for Operations and Maintenance Plans (O&M Plans) for Permanent Water Quality Control Measures (PWQ CMs) This document will guide CDOT staff and consultants, 'ncluding Design Engineers, Project Engineers, Hydraulic Engineers, and Environmental and Maintenance staff, in the development of an Operations and Maintenance Plan (0HM Plan) for Permanent Water Quality Control Measures (PWQ CM) installed during a project's active construction phase for long-term treatment of runoff from the project area after construction is complete. PWQ CMs include extended detention basins, sand filters, media filter drains, and other constructed and proprietary structures.' The CDOT Drainage Design Manual and Maintenance Manual provide additional general direction on the design and maintenance of PWQ CMs. The development of an OHM Plan for each PWQ CM needs to occur for compliance with the requirements of the Municipal Separate Storm Sewer System (MS4) Permit issued by the Colorado Department of Public Health and Environment (CDPHE), specifically Part I.E.2.v. The 0£tM Plan is intended to serve as a reference document for maintenance staff to review prior to leaving the maintenance yard so that they arrive at each PWQ CM site with the staff and equipment required to maintain the PWQ CM, an understanding of access requirements and maintenance expectations, and a knowledge of necessary procedures required to maintain the PWQ CM to its original design specifications. The OHM Plan will reflect as -built conditions. An example OHM Plan has been provided. The example OHM Plan is representative only. The information and text included in the example OHM Plan are not reflective of what should or should not be done at any site; it is reflective only of the type of information that should be provided. All OHM Plans for PWQ CMs shall generally conform to the example regarding the type of information provided; however, not all necessary contents may be included on the example 0HM Plan. Unique features may warrant inclusion of additional information. This guidance document provides a thorough discussion of the elements that will be required, if applicable, on an OHM Plan for PWQ CMs. The OHM Plan will be a doubled -sided 11x17 with a font size of at least 11 point. If an item is not required, note that is it not required rather than omitting it from the OHM Plan. No. Front of 11x17 Sheet 1. Title block and title text The front and back of each 0HM Plan shall include a title block and title text that includes the facility name, the type of PWQ CM (one of seven SAP PWQ CM categories), the SAP number, the project subaccount number, the Colorado county the CM is in, the CDOT Region the CM is in, the route and route segment the PWQ CM is treating, and the month and year the facility was constructed. It will also include the CDOT Region Maintenance Section or Local Agency responsible for maintenance. 2. Location map A large-scale location map shall cover enough area and include enough major roadways that the OHM Plan user can find the PMQ CM. The location map shall show CDOT roadway(s) with mileposts, north arrow, and location of PWQ CM. Scale shall be between 1"=1000' and 1"=500O. 3. Detailed as -built plan view A smaller scale detailed plan view of the PWQ CM location shall show all nearby roadways; all maintenance access points, turn-arounds, and sediment/debris stockpile areas; at least one hard maintenance control point including elevation; right-of-way, property boundaries, ownership, and easements; areas to remain undisturbed by maintenance activities such as areas regulated by a 404 permit or any other sensitive areas; and areas to be mowed or to receive other weed control activities including weed spraying. Major features shall be identified such as forebays, micropools, inlets, outlets, structures, trickle channels, etc. Include the 100 -year floodplain if applicable. If a power source usable by maintenance staff is present at the site, it shall be shown in the detailed plan view. Any weight - restricted areas shall be shown. Detailed instructions need not be provided on the detailed plan view if they are included in the notes. Scale shall be between 1"=20' and 1"=100'. The location of the access point to the PWQ CM may need to be delineated by dimensions from roadway centerline, edge of pavement, or other hard, visible structure if it is below grade or otherwise may be difficult to find. For ' Refer to the PWQ Section of the Drainage Design Manual for more information (hops://www.codot.gov/programs/environmental/water-quality/documents/drainage-design-manual-1). Version 1_May 2019 Page 1 of 4 SG example, if the PWQ CM is a below -grade vault with manhole access, and there are multiple manholes in the vicinity, it will be necessary to indicate which specific manhole(s) access the PWQ CM. 4. Profile While not required for every PWQ CM, if critical information cannot be sufficiently in sections and/or the plan view, a profile view of the main flow path through the PWQ CM may be added to show critical elevations and information. Such information may include variations in slope of the main channel invert or pipes and culverts, the extents and depth of the filter media, and underdrains and other structures. The profile shall show permanent pool elevations, crossing utilities, flow direction, and any design water surface elevations used such as the elevation of the water quality capture volume (WQCV) or any specific design storm event. General maintenance notes may be included on the profile or reserved for the detailed notes on the back of the ObM Plan. 5. Sections Enough PWQ CM sections shall be included to detail all tops of walls, inverts, rims, dimensions, and flowline elevations of all CM components including, but not limited to, forebays, inlets, micropools, outlets, trickle channels, storm sewers, underdrains, sumps, headwalls, wingwalls, overflow weirs, orifice plates, grates, screens, gates, trash racks, and filter media dimensions and specifications. Sections of proprietary structures may be as provided by the manufacturer. Nearby utilities shall be shown in the sections as applicable. A section showing the maintenance access roads shall also be included with the access road surfacing material and thickness, minimum width, maximum grade, and any weight limitations. 6. Grate Details Details of all grates must be included with enough information that the maintaining agency can reorder grates if they are stolen. This includes exterior dimensions, materials, and bar spacing in both directions. 7. Front page notes While the first page of the OftM Plan is generally reserved for plans, sections, profiles, and details, any notes of high importance may be added here as well as on the second page of the ObM Plan. These may include detailed notes on critical items such as how to handle wetlands or weeds on site, unique access instructions, or IGA conditions. These notes may also be included on the back page to provide redundancy. No. Back of 11x17 Sheet 1. Notes on general project information The notes shall include the project subaccount number; name(s) of the receiving water; the name, phone number, email of the CDOT Project Engineer for the design of the PWQ CM; the property owners name(s), contact name, address, phone number, and contact email address if available; the maintaining agency's name(s), contact name, address, phone number, and contact email address if available; the design engineer's name(s), contact name, address, phone number, PE license number, and contact email address if available. If CDOT is the maintaining agency, the name of the Maintenance Section Superintendent shall be included. 2. Notes on the general facility description The notes shall include a general facility description that includes what type of PWQ CM the facility is; how it functions (filtration, sedimentation, etc.); and the origin of the runoff it treats, including tributary area. A brief note about the overall project under which the PWQ CM was constructed, if applicable, should be included as well as the CDOT Maintenance Section and Local Agency (if applicable) that approved the design. If the facility will not treat the 100 -year storm event but will receive inflow exceeding its volumetric capacity, a note should be added on how those flows are safely conveyed through and beyond the facility. If flows are bypassed prior to reaching the PWQ CM, a note shall be included that details the function and location of the bypass structure. 3. Notes on the anticipated inspection and maintenance frequency and procedure COLORADO Department of Transportation Version 1_May 2019 Page 2 of 4 Alt Q COLORADO � : Initial PWQ CM inspection shall be annually plus after storms producing more than 1 inch of rainfall per hour. at a minimum, with an inspection form filled out for each inspection. Inspection frequency may be adjusted based on findings of inspections during the first year. PWQ CM maintenance shall be annually at a minimum. Maintenance frequency may be increased based on findings of inspections during the first year and any requirements issued by the EPA or CDPHE. Examples of items to be inspected include pond forebays, low water crossings, riprap side slopes and inverts, grouted riprap, inlets, access ramps, storm sewer outfalls, incoming and outgoing pipes, pond outlet structure including interior of structure, canal gate (to be exercised), restrictor plate, micropool, trash rack, well screen. The maintenance procedure shall include the following at a minimum, provided they are applicable: Traffic control plan; confined space entry protocols; dewatering and water control requirements such that a dewatering permit is not required; sediment and debris removal and disposal requirements, including longest reach distance from access road; mowing and weed control; information on wetlands and other sensitive areas; any other maintenance required maintenance activities; items to be replaced; any materials testing requirements if sediment must be tested for contaminants prior to disposal; post - maintenance considerations such as restoring flow patterns, removing temporary dewatering and water control measures such as stop logs, or additional cleanup requirements. 4. Notes on required maintenance equipment, materials, staffing, and responsibility The notes shall include all equipment, materials, and labor that is anticipated to be required to maintain the PWQ CM. Equipment may include, but not be limited to mowers, pumps, hoses, vac trucks (note reach required), air compressors, shovels, buckets, excavators (note reach required), inflatable coffer dams, weed killer, generators, and sprayers. Anticipated sizes of all equipment shall be included. Materials may include proprietary replacement products such as filter bags or media that need to be ordered in advance or more general filter media. Materials notes should include approximate quantities. Staffing notes shall include the minimum number of maintenance staff expected to be required to complete the maintenance activities. For example, if two employees are required to operate a pump or install a coffer dam, this should be noted in this section. These notes shall include a description and details of any inter -governmental agreements (IGAs) regarding maintenance of the PWQ CM and which entity is responsible for which aspects of maintenance. The IGA description and details should include the dates and parties subject to the agreement and a general summary of the agreement, including what happens if one party does not fulfill its contractual obligations. Also note if CDOT or a Local Agency is relying on C.R.S. 43-2-135 as the maintenance mechanism. 5. Notes on ROW, adjacent ownership, and access The notes shall include a general description of the right-of-way shown in the detailed plan view, the adjacent property ownership, and locations and dimensions of maintenance access. These notes shall include property access requirements such as whether locked gates might be encountered, locations of keys, access codes, and vehicular weight limitations. Notes shall also include additional applicable specific instructions (e.g., must approach access drive from the south). 6. Notes on vegetation management The notes are specific to seed mixes, mowing, and weed control. There may be some redundancy with the notes on the anticipated inspection and maintenance procedure and frequency. These notes are intended to be more detailed. The notes shall include all seed mixes (dryland/upland and/or wetland mixes) and any trees or shrubs that have been planted at the site. Seed mixes shall include all genus, species, variety, and pounds pure live seed per acre of each type of seed that was planted as well as the location (e.g. above elevation )0XX.XX, on the low flow channel side slopes, etc.). These notes shall also indicate the total area to be mowed, in acres, and any notes on mowing. How weed control is to be accomplished (e.g. mowing, spraying, etc.) shall be included in the notes. Different areas may require different methods, and these shall be noted. These notes shall also include criteria on replacement of seed or other vegetation. Version 1_May 2019 Page 3 of 4 aQ 7. Notes on hydraulic design The notes shall include all flow rates used in the hydraulic design including base flow and the 2- and 100 - year peak inflow and outflow at a minimum. The notes shall include other calculated flow rates as applicable, the WQCV and associated water surface elevation, the excess urban runoff volume (EURV) and associated water surface elevation, if applicable, the 100 -year volume and associated water surface elevation if applicable, and the volumes of major structures that can accumulate sediment including forebays, micropools, and sumps. Depths of major structures shall be noted. The WQCV drain time and EURV drain time shall be noted if applicable. 8. Notes on sensitive areas, wetlands, and permits The notes shall include descriptions of any environmentally sensitive areas, wetlands to remain undisturbed, and areas covered by a 404 permit or other environmental permit and how maintenance activities are different for these areas, if applicable. The notes shall include any monitoring or inspections required by 404 or other environmental permits. The notes shall also include information on any current or retired groundwater monitoring wells, any hazardous materials that were or could reasonably be anticipated to be encountered on site, and any known unmitigated hazards. Permits that may be required include a floodplain development permit if the CM is within the 100 -year floodplain and CDPHE permits such as construction dewatering, stormwater discharge, groundwater, etc. 9. Notes on snow and ice control Notes shall include descriptions of locations where maintenance staff are responsible for snow and ice control if necessary for sidewalks and/or roadways within the PWQ CM and the methods by which snow and ice are to be controlled. If requirements for snow and ice control exist, they are likely a Local Agency requirement. 10. Notes on miscellaneous information Notes shall include any other items or details that are important for understanding the inspection and maintenance requirements of the site or for general informational purposes. One required item is the approximate survey date, horizontal and vertical datum, and coordinate system information. 11. Notes on homeless encampments The note included on the OEM Plan template shall be included on all O&M Plans. The contact person for all PWQ CMs maintained by CDOT should be the Maintenance Section Superintendent. For PWQ CMs maintained by a local agency, contact the local agency to determine who should be contacted. COLORADO Department of 4944678 Pages : 252 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Wald County , CO 1111 P:011 11111 Version 1_May 2019 Page 4 of 4 APPENDIX D - As -Built Drawing Checklist 4947588 Pages: 253 of 285 03/00/2024 11:15 AM R F..:$0.00 Carly Mopes., Clark and Raoordar, Wild County , CO 11111 4844875 Pages: 253 of 285 02/15/2024 12:24 PM R F..:$0.00 Carly Koppss, Clark and Raoordar, Wild County , CO l+�Mrry�l,lR� � �I�h4Y 11111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA As -Built Drawing Requirements As -built drawings are required for all projects within, or draining to, the MS4 area or when requested by Development Review for sites outside of the MS4 area. While it is expected that a project will be built in accordance with the accepted construction plans, it is understood that unforeseen site conditions may require deviations. Therefore, as -built drawings are .equired to be submitted for all site drainage and shall clearly demonstrate the construction of drainage natures as designed and in accordance with Weld County Code. As -built drawings shall verify critical ublic safety elements and document all modifications/changes to the original plans as described below. s -built drawings are typically a red -lined copy of the original, accepted grading plans, unless otherwise allowed by Public Works. out 'AP 0 v ) -o ere ale NO3- %.--� It1 u.. tilt N: -ot s a �- :Int* a_�• m_4(.3 re a :S WNO a. ari { eso >X Lou- c°) __ NaO) amnia_ al NC — it (1.Nam NU — rt at. cis ta N NNo a.CON s -Built Drawing Requirements: Surveyor's and Engineer's Statements of Substantial Compliance are required on the cover sheet only and as follows: • Registered Colorado Professional Land Surveyor: A registered land surveyor in the State of Colorado shall certify the construction of drainage and stormwater infrastructure with the following statement: "A field survey was conducted by (Surveyor), on (Dates). Unless explicitly marked, constructed condition should not be assumed. I, (Surveyor), hereby state that in my professional opinion the information shown on these plans accurately represents the improvements constructed." • Registered Colorado Professional Engineer: The responsible P.E. for the project shall certify the construction of drainage and stormwater infrastructure with the following statement: "Based upon review of and reliance on the field survey data and other pertinent data provided by (Name of Firm(s) or Surveyor), on (Date), and a final site investigation conducted on (Date), I hereby state that to the best of my knowledge, information and belief, it is my professional opinion that the facilities shown in these drawings were constructed in substantial compliance with the accepted Drainage Report and/or Construction Drawings and the Engineer's intent. This statement is based only on a review of the field survey data and a final site investigation." The As -Built drawings are a standalone document and shall provide an exact rendering of the construction as it appears in the field. Any modifications to the original plans, whether minor or major, shall be included. The changes shall be color coded, bubbled, clouded, or outlined and they shall be explained clearly in writing. Any deviation from the plans shall be specified, whether the change was in design, location, or the materials used. Small details like materials used shall be documented if they differ from those indicated in the original plans. The intended but unused materials shall be crossed out to acknowledge the changes that emerged during the construction process. If necessary, additional sheets may be added to clearly show all required information. The verification of public safety elements (i.e., detention/retention pond volume, stormwater conveyance structure capacity, etc.) shall be based on a field survey prepared by a Colorado licensed surveyor. • As -Built Drawings for Storm Sewer shall verify the material, size and longitudinal grade of all storm sewer pipes and culverts. Elevations are required for all pipes, inlets, riprap, headwalls, and all other storm drainage infrastructure shown on the accepted plans. • As -Built Drawings for Open Channels shall verify all drainageway grades/slopes, channel cross -sections and horizontal and vertical information for all grade control structures. • As -Built Drawings for Detention / Water Quality Facilities shall verify horizontal/vertical information of all facilities including pipe or channel inlets, low flow or trickle channels, outlet structures, emergency overflow spillways, and water surface elevations (WQCV and 100-yr storm event). Provide spot elevations for critical stormwater infrastructure locations (spillways, top of ponds, outlet structures, etc.). A stage/storage table of the surveyed pond may be required if topography (1' contours) significantly differs from the original plans. Department of Planning and Zoning I Development Review11402 1402 N. 17th Avenue, Greeley, CO 80632 I Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Development-Review APPENDIX E - USDCM 2007 Runoff Coeffi ents 4947569 Pages: 255 of 285 03/05/2024 11:15 AM R Fa.:$0.00 Carly Koppaa, Clark and Recorder, Wald County , CO 1111 4141 11111 4944675 Pages: 255 of 285 02/15/2024 12:24 PM R F.a:$0.00 Carly Koppaa, Clark and Raoordar, Wald County , CO NPARLIPlifihnilV hi 111 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA DRAINAGE CRITERIA MANUAL (V. 1) Table RO-5— Runoff Coefficients, C RUNOFF Percentage Imperviousness Type C and D NRCS Hydrologic Soil Groups 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 0% 0.04 0.15 0.25 0.37 0.44 0.50 5% 0.08 0.18 0.28 0.39 0.46 0.52 10% 0.11 0.21 0.30 0.41 0.47 0.53 15% 0.14 0.24 0.32 0.43 0.49 0.54 20% 0.17 0.26 0.34 0.44 0.50 0.55 25% 0.20 0.28 0.36 0.46 0.51 0.56 30% 0.22 0.30 0.38 0.47 0.52 0.57 35% 0.25 0.33 0.40 0.48 0.53 0.57 40% 0.28 0.35 0.42 0.50 0.54 0.58 45% 0.31 0.37 0.44 0.51 0.55 0.59 50% 0.34 0.40 0.46 0.53 0.57 0.60 55% 0.37 0.43 0.48 0.55 0.58 0.62 60% 0.41 0.46 0.51 0.57 0.60 0.63 65% 0.45 0.49 0.54 0.59 0.62 0.65 70% 0.49 0.53 0.57 0.62 0.65 0.68 75% 0.54 0.58 0.62 0.66 0.68 0.71 80% 0.60 0.63 0.66 0.70 0.72 0.74 85% 0.66 0.68 0.71 0.75 0.77 0.79 90% 0.73 0.75 0.77 0.80 0.82 0.83 95% 0.80 0.82 0.84 0.87 0.88 0.89 100% 0.89 0.90 0.92 0.94 0.95 0.96 TYPE B NRCS HYDROLOGIC SOILS GROUP 0% 0.02 0.08 0.15 0.25 0.30 0.35 5% 0.04 0.10 0.19 0.28 0.33 0.38 10% 0.06 0.14 0.22 0.31 0.36 0.40 15% 0.08 0.17 0.25 0.33 0.38 0.42 20% 0.12 0.20 0.27 0.35 0.40 0.44 25% 0.15 0.22 0.30 0.37 0.41 0.46 30% 0.18 0.25 0.32 0.39 0.43 0.47 35% 0.20 0.27 0.34 0.41 0.44 0.48 40% 0.23 0.30 0.36 0.42 0.46 0.50 45% 0.26 0.32 0.38 0.44 0.48 0.51 50% 0.29 0.35 0.40 0.46 0.49 0.52 55% 0.33 0.38 0.43 0.48 0.51 0.54 60% 0.37 0.41 0.46 0.51 0.54 0.56 65% 0.41 0.45 0.49 0.54 0.57 0.59 70% 0.45 0.49 0.53 0.58 0.60 0.62 75% 0.51 0.54 0.58 0.62 0.64 0.66 80% 0.57 0.59 0.63 0.66 0.68 0.70 85% 0.63 0.66 0.69 0.72 0.73 0.75 90% 0.71 0.73 0.75 0.78 0.80 0.81 95% 0.79 0.81 0.83 0.85 0.87 0.88 100% 0.89 0.90 0.92 0.94 0.95 0.96 4944675 Pages: 256 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clark and Recorder, Wald County CO IIIII'PAU +'t�:l�li� K�I'Mk� III �f W�h lYtitik lu l l 2007-01 RO-11 Urban Drainage and Flood Control District RUNOFF DRAINAGE CRITERIA MANUAL (V. 1) TABLE RO-5 (Continued) -Runoff Coefficients, C Percentage Imperviousness Type A NRCS Hydrologic Soils Group 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 0% 0.00 0.00 0.05 0.12 0.16 0.20 5% 0.00 0.02 0.10 0.16 0.20 0.24 10% 0.00 0.06 0.14 0.20 0.24 0.28 15% 0.02 0.10 0.17 0.23 0.27 0.30 20% 0.06 0.13 0.20 0.26 0.30 0.33 25% 0.09 0.16 0.23 0.29 0.32 0.35 30% 0.13 0.19 0.25 0.31 0.34 0.37 35% 0.16 0.22 0.28 0.33 0.36 0.39 40% 0.19 0.25 0.30 0.35 0.38 0.41 45% 0.22 0.27 0.33 0.37 0.40 0.43 50% 0.25 0.30 0.35 0.40 0.42 0.45 55% 0.29 0.33 0.38 0.42 0.45 0.47 60% 0.33 0.37 0.41 0.45 0.47 0.50 65% 0.37 0.41 0.45 0.49 0.51 0.53 70% 0.42 0.45 0.49 0.53 0.54 0.56 75% 0.47 0.50 0.54 0.57 0.59 0.61 80% 0.54 0.56 0.60 0.63 0.64 0.66 85% 0.61 0.63 0.66 0.69 0.70 0.72 90% 0.69 0.71 0.73 0.76 0.77 0.79 95% 0.78 0.80 0.82 0.84 0.85 0.86 100% 0.89 0.90 0.92 0.94 0.95 0.96 4844875 Pegs. : 257 of 285 CarlyBKopp i,iClerk and Recorder,,OWeld County , CO VIII Millilli 'irf1 14INAD:1,1.4.1Nififfilirti "Ill RO-12 2007-01 Urban Drainage and Flood Control District APPS IX F - Rational Formula -Based Modified FAA Procedure 4947589 Pages: 258 of 285 03/08/2024 11:15 AM R Fee:$0.00 Carly Koppa., Clark and Raoordar, Wald County , CO Ali 10 4I'14YrIl '114 11 111 4944875 Pages: 258 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO VIII ��IM1YI'�!1'�tirl��M 'I�i�''K�I iiiiiifial551101,Iiiyi II II WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA STORAGE DRAINAGE CRITERIA MANUAL (V. 2) 3.2.3 Rational Formula -Based Modified FAA Procedure The Rational Formula -based Federal Aviation Administration (FAA) (1966) detention sizing method (sometimes referred to as the "FAA Procedure"), as modified by Guo (1999a), provides a reasonable estimate of storage volume requirements for on -site detention facilities. Again, this method provides sizing for one level of peak control only and not for multi -stage control facilities. The input required for this Rational Formula -based FAA volume calculation procedure includes: A = the area of the catchment tributary to the storage facility (acres) C = the runoff coefficient Q. = the calculated 5 -year or 10 -year historic runoff release rate from pond (cfs) T, = the time of concentration for the tributary catchment (see the RUNOFF chapter) (minutes) P, = the 1 -hour design rainfall depth (inches) at the site taken from the NOAA Atlas website using a site specific gage, for the relevant return frequency storms The calculations are best set up in a tabular (spreadsheet) form with each 5 -minute increment in duration being entered in rows and the following variables being entered, or calculated, in each column: 1. Storm Duration Time, T (minutes), up to 180 minutes. 2. Rainfall Intensity, / (inches per hour), calculated using Equation RA -3 from the RAINFALL chapter. 3. Inflow volume, V, (cubic feet), calculated as the cumulative volume at the given storm duration using the equation: V = CIA (60T) 4. Outflow adjustment factor m (Guo 1999a): m=1 1+T� 0.5≤m≤1and T≥Tn 5. The calculated average outflow rate, Qav (cfs), over the duration T: Qav = mQPa 494756! Pages: 259 of 285 03/05/2024 11:15 AM R Faa:$0.00 Carly Kappaa, Clark and Recorder, Weld County , CO VIII I �.�O'Jl�llr11,14 NMI itinl+kl*IlrM BIM (SO -6) (SO -7) (SO -8) 12/2011 Urban Drainage and Flood Control District DRAINAGE CRITERIA MANUAL (V. 2) STORAGE 6. The calculated outflow volume, Va, (cubic feet), during the given duration and the adjustment factor at that duration calculated using the equation: Va = Qav (60T) 7. The required storage volume, Vs (cubic feet), calculated using the equation: VS= V—Vo (SO -9) (SO -10) The value of V. increases with time, reaches a maximum value, and then starts to decrease. The maximum value of VS is the required storage volume for the detention facility. Sample calculations using this procedure are presented in Design Example 6.2. The modified FAA Worksheet of the UD- Detention Spreadsheet performs these calculations (download from Weld County website). 4947589 Pages: 280 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO 111111:41MWink lull 4044875 Pages: 280 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel', Clerk and Recorder, Weld County , CO Wyk 11111 12/2011 Urban Drainage and Flood Control District SO -11 DRAINAGE CRITERIA MANUAL (V. 2) STORAGE 6.0 DESIGN EXAMPLES 6.2 Example -Rational Method Analysis Use the FAA method to determine the required detention volume for the 100 -year storm event for a 15 - acre site that will have a developed percentage imperviousness of 45%. The NRCS soil survey shows the site has hydrologic soil group B soils. The allowable release rate from the basin has to be limited to the 10 -year historic runoff value for the basin (based on a 2% imperviousness value). The time of concentration has been calculated at 12 minutes. The 100 -year, 1 -hour point precipitation is 2.6 inches. A runoff coefficient, C, of 0.51 is determined using Table RO-5 of the RUNOFF chapter (the 45% row and 100 -year storm column of the type B soils table equals 0.51). The calculations are shown in spreadsheet form UD-Detention workbook in Table SO -2. 4047389 Pages: 281 of 283 08/08/2024 11:18 AM R Fee:$0.00 Carly Koppel', Clerk and Recorder, Weld County , CO 1111 PAM WhIlli nili ki)/IoN GAGW:IT I Iii 11111 4844875 Pages: 281 of 285 02/18/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO 1111 FANWOOD % I L Ihirdi P M'L104'C'Wi 11111 12/2011 SO -39 Urban Drainage and Flood Control District STORAGE DRAINAGE CRITERIA MANUAL (V. 2) Determination of Detention Volume Using Modified FAA Method Rainfall durations must be entered in an increasing order. Rainfall Duration minutes (input) Rainfall Intensity inch/hr (output) Inflow Volume cubic feet (output) Adjustment Factor (output) Average Outflow cfs (output) Outflow Volume cubic feet (output) Storage Volume cubic feet (output) 0.00 12.02 0 5.00 8.72 20,021 1.00 12.75 3,825 16,196 10.00 6.95 31,902 1.00 12.75 7,650 24,252 15.00 5.83 40,119 0.90 11.48 10,328 29,791 20.00 5.05 46,316 0.80 10.20 12,240 34,076 25.00 4.47 51,257 0.74 9.44 14,153 37,105 30.00 4.02 55,351 0.70 8.93 16,065 39,286 35.00 3.66 58,838 0.67 8.56 17,978 40,861 40.00 3.37 61,873 0.65 8.29 19,890 41,983 45.00 3.13 6.4,559 0.63 8.08 21,803 42,757 50.00 2.92 66,967 0.62 7.91 23,715 43,252 55.00 2.74 69,150 0.61 7.77 25,628 43,522 60.00 2.58 71,147 0.60 7.65 27,540 43,607 65.00 2.45 72,987 0.59 7.55 29,453 43,535 70.00 2.32 74,694 0.59 7.47 31,365 43,329 75.00 2.22 76,287 0.58 7.40 33,278 43,010 80.00 2.12 77,780 0.58 7.33 35,190 42,590 85.00 2.03 79,186 0.57 7.28 37,103 42,083 90.00 1.95 80,514 0.57 7.23 39,015 41,499 95.00 1.88 81,774 0.56 7.18 40,928 40,846 100.00 1.81 82,972 0.56 7.14 42,840 40,132 105.00 1.75 84,114 0.56 7.10 44,753 39,362 110.00 1.69 85,206 0.55 7.07 46,665 38,541 115.00 1.63 86,252 0.55 7.04 48,578 37,675 120.00 1.58 87,256 0.55 7.01 50,490 36,766 125.00 1.54 88,222 0.55 6.99 52,403 35,820 130.00 1.49 89,152 0.55 6.96 54,315 34,837 135.00 1.45 90,050 0.54 6.94 56,228 33,823 140.00 1.41 90,917 0.54 6.92 58,140 32,777 145.00 1.38 91,757 0.54 6.90 60,053 31,704 150.00 1.34 92,569 0.54 6.89 61,965 30,604 155.00 1.31 93,358 0.54 6.87 63,878 29,480 160.00 1.28 94,123 0.54 6.85 65,790 28,333 165.00 1.25 94,867 0.54 6.84 67,703 27,164 170.00 1.23 95,590 0.54 6.83 69,615 25,975 175.00 1.20 96,295 0.53 6.81 71,528 24,767 180.00 1.17 96,981 0.53 6.80 73,440 23,541 Stormwater Detention Volume (Cubic Feet) = The required storage volume is 43,607 cubic feet (approx. 1.0 acre-foot). 4844875 Pages: 282 of 283 02/1B/2024 12:24 PM R F..:$0.00 Carly Keeps., Clerk and Recorder, Wald County , CO illI PA111Pa I dkh'iFIAMAlialit III II SO -40 43,607 12/2011 Urban Drainage and Flood Control District APPENDIX G - Grading Permit Checklist 4947589 Pages: 283 of 285 03/08/2024 11:18 AM R Fee:$0.00 Carly Kopp., Clerk and Recorder, Weld County , CO IIIII MiQI i' INILINNAIMitirVillAnik till 4944675 Pages: 263 of 285 02/18/2024 12:24 PM R F..:$0.00 Carly Kappa., Clerk and Recorder, Weld County , CO lIII KNCIVitai:INuIWJ4'MI*i r 5 N WM 1I III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA -a Vs_ V ae golo3.1 N •3 — 4- -"� 0 --:as O•LL o N 0 Ir ■. Sc 12 inn _Am a-+ fit:re Vi) ones � Nmnr,>a WOO Grading Permit Checklist Project Name: The purpose of this checklist is to assist the applicant's Engineer in developing a plan to prevent offsite discharge of sediment during active construction anc to support the intent of the Weld County Code. Is the project in the MS4? Yes _ No If yes, the following requirements in blue apply. See Chapter 8, Article IX of the Weld County Code. Grading Permit Requirements Weld County Grading Permit Application Grading & Drainage Plan Sediment & Erosion Control Plan Utility Map (per SUE/811 Law Level B, SB18-167) General Requirements for Plans The following items are required both the Grading Plan and Sediment & Erosion Control Plan: Scanned electronic (pdf) or 11" x 17" hard copy Signed and stamped by Colorado PE Engineering scale & north arrow Weld County case number, if applicable Property lines, rights -of -way and easements Limits of disturbance (include acreage) and temporary construction easements/agreements, if applicable Grading Plans The following items are required for Grading Plans in addition to the general requirements above: J Existing and Proposed Grading (1' annotated contours) Arrows depicting flow direction and grade flow Locations and design details for proposed drainage improvements (pond, culverts, swales, spillway, trickle channel, outlet, etc.) — Include finish grade, flowline, invert and crown elevations as appl cable. Onsite or adjacent springs, streams, wetlands and/or other surface waters, including irrigation ditches I Vicinity Map with the drainage route to the nearest receiving water Notes on the major phases of construction Final stabilization (pavement, gravel, >70% vegetative growth, etc.) Sediment & Erosion Control Plans The following items are required for Sediment & Erosion Control Plans in addition to the general requirements above: ■ Provide an Interim Construction Plans and Final Construction Plans clearly depicting, describing and locating all temporary control measures to be implemented. Include installation and implementation specifications (BMP details) for structural control measures (silt fence, straw wattles, vehicle tracking control, etc.), including maintenance and removal notes. Provide a narrative description of non-structural control measures (preservation of vegetation, traffic control, surface roughening, street sweeping, etc.). Clearly depict, describe and locate all permanent stabilization methods to be implemented. Include installation and implementation specifications for final stabilization methods (seed, crimped mulch, soil amendment, soil retention blanket, turf reinforcement mat, etc.). Other Required Documents (If Applicable) MS4 Pollution Prevention Plan Checklist for sites located within the MS4 area Weld County Access Permit Weld County Right -of -Way Permit Weld County Early Release Request for Grading Permits (Land Use cases must be conditionally approved by BOCC, Planning Director or designee.) CDPS Permit for Construction Stormwater Discharges (COR400000) CDPS Permit for Construction Dewatering Discharges (COG070000) USACE Section 404 Permit for Dredge/Fill in WOTUS Vle V e N0 J -3 - Th=r- i0 t& Natair In. • •Inr-Prin Y01 Y alvt-L 92 dN •a..r N t) -� re a. fEt InN o� Cook Department of Planning and Zoning I Development Review 1402 N. 17th Avenue. Greeley, CO 80632 I Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Development-Review 1. 2. Once the revised Grading Plan and/or Sediment & Erosion Control Plan (with responses) have been submitted, the County may provide additional comments. 3. Please provide a written response on how the above comments have been addressed when resubmitting. Thank -you. 4947569 Pages: 265 of 285 03/05/2024 11:15 AM R Fn•:$0.00 Carly Koppel Clerk and Recorder, Weld County , CO 4944675 Pages: 265 of 285 02/15/2024 12:24 PM R Fn :$0.00 Carly Koppel, Clerk and Reoorder, Weld County , CO III P)PjK% I1)icl1€iikI Likii III III icritIV lawn: "Ill Department of Planning and Zoning Development Review11555 1555 N. 17tH Avenue, Greeley, CO 80631 I Ph: 970-400-6100 www.weldgov.com/Government/Departments/Planning-and-Zoning/Development-Review 3/13/2023 APPENDIX H - MS4 Pollution Prevention Plan Checklist and Manual 4647560 Pages: 266 of 265 03/5(,2024,11;15 AM R Fee:$0.00 oppaaClark and Raoordar, Wald County CO WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA I � 0 - -a Nci3 0. left • crytr ; • -a g a •w a se i Inn Le . - a gr �10 N o� N ,Di_ eau MS4 Pollution Prevention Plan Checklist Site Name or Case No: Complete the table below and submit with the Grading Permit application. At a minimum, items in red are required to be included in the Grading Plans or Sediment & Erosion Control Plans. Mark other applicable items with a check mark. Items not listed below may be added to "Other Control Measures", which will be reviewed and accepted on a case -by -case basis. Temporary Control Measures If applicable to the I site If applicable to the site, include the following: Narratives (Pages located in Part I) Details (Pages located in Part in Sediment and Erosion Control Measures: SC -1: Silt Fence (SF) ✓ SF -1 to SF -2 SF -3 to SF -4 SC -2: Sediment Control Log (SCL) ✓ SCL-1 to SCL-2 SCL-3 to SCL-5 SC -3: Straw Bale Barrier (SBB) SBB-1 SBB-2 to SBB-3 SC -S: Rock Sock (RS) RS -1 RS -2 to RS -3 SC -6: Inlet Protection (IP) 1P-1 to IP-3 IP-4 to IP-8 EC -8: Temporary Outlet Protection (TOP) TOP -1 TOP -2 to TOP3 EC -12: Check Dams (CD) CD -1 to CD -2 CD -3 to CD -6 Materials and Site Management: MM -1: Concrete Washout Area (CWA) J CWA-1 to CWA-2 CWA-3 to CWA-4 MM -2: Stockpile Management (SP) ✓ SP -1 to SP -2 SP -3 to SP -6 MM -3: Good Housekeeping Practices (GH) ✓ GH-1 to GH-6 N/A SM-4: Vehicle Tracking Control (VTC) ✓ to VTC-2 VTC-3 to VTC-6 VTC-1 SM-6: Stabilized Staging Area (SSA) ✓ SSA -1 to SSA -2 SSA -3 to SSA -4 SM-7: Street Sweeping and Vacuuming (SS) ✓ SS -1 N/A SM-9: Dewatering Operations (DW) If no dewatering is anticipated, include a statement in the notes. DW-1 to DW-2 DW-3 to DW-5 SM-11: Temporary Batch If no temporary batch plants with the site, include a statement Plant (TBP) are associated in the notes. TBP-1 to TBP-2 N/A EC -14: Wind Erosion/Dust Control (DC) I DC -1 N /A Site Stabilization: EC -1: Surface Roughening (SR) J SR -1 to SR -2 SR -3 to SR -4 EC -2: Temporary/Permanent Seeding (TS/PS) ✓ TS/PS-1 to TS/PS-2 N/A Weld County Guidance for Reseeding I WC and Reseeding Seed Mixes Tips N/A EC -4: Mulching (MU) V MU -1 to MU -2 N/A EC -6: Rolled Erosion Control Products (RECP) RECP-1 to RECP-5 RECP-6 to RECP-9 Other Control Measures (i.e. proprietary products): 4944675 Pages: 267 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Wild County CO VIII PAIPalifiniti Ii tI 1111 APPENDIX I - Traffic Impact Study Checklist 4647566 Pages: 268 of 285 03/00/2024 11:15 AM R F..:50.00 Carly Kappa' Clark and Raoordar, Wald County CO 11111 4944875 Pages: 268 of 285 02/15/2024 12:24 PM R F..S0.00 �� I�rrKh Rih�r4� I it JRir� N� R�1� illti�iti till WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Traffic Impact Stud Checklist Project Name: If a Traffic Impact Study is determined to be required, this checklist is intended to assist the applicant's engineer with developing a Traffic Impact Study that supports the intent of the Weld County Code using commonly accepted engineering practices and methodologies. Traffic Impact Study Report Content Weld County Case Number Signed and stamped by a Colorado licensed PE Project Location and Traffic Impact Area Map Location Map, including existing and proposed roadway network and intersections Site description Existing and proposed land uses in vicinity of site Existing traffic conditions, including: Daily traffic volumes (counts conducted over 72 hours and within the previous 24 months) Intersection turning movement counts (AM/PM peak hour) (minimum of 2 hours per peak period and collected within the previous 12 months) Roadway classification Roadway characteristics and auxiliary lanes Access points and traffic control devices Background traffic projections for Shod -Range and Long -Range Scenarios, including growth rate used Trip Generation (ITE or site -specific) and proposed truck percentages Vehicle types Trip distribution (proposed) Total proposed volumes for short-range (project opening) and long-range analysis years Operational analysis for existing year, short-term horizon with project traffic, and long-term horizon with and without project traffic along mainline roadways and existing and proposed intersections. 4944878 Pages: 269 of 285 02/15/2024 12:24 PM R Fee:$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO III PriR110411 MY Ili hiNdidinviiiNcik liii Existing and background operational and geometric deficiencies J Identify deficiencies, including pedestr an/bicycle connections Li Identify any structurally or capacity deficient roads, intersections, or bridges within the study area or along a proposed haul route Appropriateness of existing and proposed access locations compared to the required access spacing in the Weld County Code Is a CDOT Access Permit required? Signal warrant analysis (if proposed) Identify need for auxiliary lanes (right/left turn lanes), including storage capacity and length based on County guidelines and State Highway Access Code requirements for Rural Highways (Classification R -B) Sight distance analysis at access points Safety analysis based on crash history (if requested by County) Paving threshold analysis Tracking control measures Are parking needs for development met? Identify safe route to school and/or school bus stops Identify accessibility to public transit Proposed haul route (if applicable) Identify proposed mitigation and recommendations Summary of findings Include any assumptions and adjustment factors Any additional information necessary for special considerations L 4947569 Pages: 269 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Kopper, Clerk and Recorder, Weld County , CO Ill MrdviffiMauiliuNhruii#1r,thiCilrirIKtiliuwlk 1liii Department of Planning and Zoning I Development Review 11402 N. 170, Avenue, Greeley, CO 80632 I Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Development-Review APPENDIX] - Weld County Standard Details 03/405/2024 11:15 Pages: 270 of s 285 Carly Koppaa, Clark and Raoordar, Weld County , CO 4844875 Pages: 270 of 285 02/15/2024 12:24 PM R Fas:$0.00 Carly Koppaa, Clerk and Raoordar, Wald County , CO Sill FA1 N' 'MN IIM I01.Iok lli It Y0YI UI III WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA 4947589 Pages: 271 of 285 03/05/2024 11:15 AM R Fee :$0.00 Carly Koppel, Clerk and Recorder, Weld County , CO Ila,l MrEuf'N s" ~ n 3 QUANTITIES FOR, ONE INLET (SEE NOTE 10) STEEL GRATE QUANTITIES -� . -r� 6.! }-•--------� ''•'^ A ( %2" 3'4' ND. r' 10'-0" PiDESCRiPTIDN LENGTH LBS PER FT. WEIGHT (LBSJ , ' 4" MIN ' I it/4' 4%z ' R. CONCRETE. (CU. m STEEL r2.i STEPS ,,AEQ'D IPIECES �—SYMMETRICAL ABOUT �� 4 S4 z 7.7 BEAM 41" 7.90 106 , ' I -I STEP/ I GRATE ' x %4" FLAT 2'-6' lA 3'0" 1.1 76 0 81 0 # I >� ' PARALLEL 2 3'/p" x''/i" FLAT 2 3" I/i" FLAT 26%y" 26%" 2,98 13 '�L751 A 36" �' _•�v SLOT DETAIL 3 -6" 1.2 97 0 ' I TO SLOPE SHALL I w � ROADWAY PY, x 2.55 12 TOTAL LBS. - 131 _' - -SSS_ I t RECESS ' FOR GRATIING_ I ig" WASHER '%5" x 1° l'i" 4' 0" 1.3 a' -s" 1.5 102 J 17 MATCH t MEDIAN p"=��-'"' 3" MIN, CLEARANCE _I_ * i5/i6" CLR: - OFFSET .� SLOTTED HOLE y -p 3.6 123 SLOPE •�_• rrr•�.�: �- L ge 5�n x g.. n 5'-6" 1.J 6'-0" 1.9 138 2 143 3 1pFe � 1 I CROSS' T I PLAN t [..--42.[..--42.¢2n PLIPE �A♦ BOLT 2 ` 1%z" 1%v" 6'-6" 2.0 P-0" 2.1 p-6" 159 164 3 l '' 5 ? LL _.._ ^` 11 '—aa2—'— — ^IL #a w 2� INLET " wAL, I. 2.2 5' o° z,a 180 ley a L,. A ]2" MIN. ,...t ' �f 12"'CENTER' ' ,1• (7Yp_)a02 i GRATE INSTALLATION ALTERNATE SLOT AND HOLD DOWN 8`6" 2.5 9'-0" 2,6 200 4 206 5 B INLET WITH DITCH PAVING SECTION VIEW i Y" - ,ti Lii'16.D TAIL PLATE DETAIL 94" 2.s 10'0" 2.9 221 s 236 s I i I , -r-t-a02-,J,- i-Li 11'-6" 3,3 252 6 GENERAL NOTES -� d• ' 1 4 SLOPE TO FIT D[KE L o !. ' 1 7 `* X �� 1 9X. J 1. WLff TYPE C iS NpT ROADWAYS. THIS INLET HS -20 RATED AND SHALL NOT BE PLACED IN PAVED ♦ PIPE INSIDE DIAMETER SHALL BE 30 IN. DR SHALL BE USED ONLY OUTSIDE PAVED ROADWAYS. LESS CONCRETE AND STEEL QUANTITIES ARE EARTHWORK ASSpCIATEO WITH DIKE 3" M[N._=402 INCLUDED IN THE £DST OF THE INLET HEIGHT OF DIKE CLEARANCE y gn 2. CONCRETE SHALL BE FOR ONE ENTIRE INLET BEFORE DEDUCTION CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. FOR VOLUME OCCUPIED BY PIPE. WEIGHT OF I� MAX —10.1 —1'�— 3. REINFORCING BARS SLOPE 1/i' PER FT -MAX. "" Militia' A MIN. SHALL OE GRADE 6q EPDXY COATED, AND DEFORMED ,4, AND STEEL INCLUDES A RING FOR THE MAXIMUM 2 INCH CLEARANCE. CUT OR BEND AROUND PIPES AS REQUIRED. PIPE DIAMETER. 1!-0n qg„ ELEVATION 4. CONCRETE SLOPE AND SECTION 507. REINFORCEMENT D[TCH PAVING SHALL BE iN ACCORDANCE WITH FOR CONCRETE SLOPE PAVING SHALL BE BAR LIST FOR H = 2 FT. -6 IN. NORMAL MEDIAN DITCH GRADE q�! a" CONCRETE CONCRETE INLET s X a - w1 a X wl4 DR s X s - w2.1 x wz.1. AND BENDING DIAGRAM CTING PIPE LENGTH N P ETA0. SMM� �"- SLOPE AND DITCH PAVING (REINFORCED) (REQUIRES L3 CU. YDJ 4 x 7.7 - 5. STRUCTi1RA1 STEEL BE GALT ZED, AND ' %4" FLAT 6, THE STANDARD INLET FOR GRATES AND GRATE INSTAllATION HARDWARE SHALL SHALL BE IN ACCORDANCE INTI XsECTION 712. GRATES SHALL OE USED ON ALL TYPE C INLETS MARK NO; REA D. HEIGHT LENGTH �" 4'-0" --'I CROSS_ � 1 PIPE THIS SLOPE SHALL BE SHOWN ON THE PLANS q'-0" UNLESS CLOSE MESH 7. CLOSE MESH GRATES INLET GRATES ARE SPEC[FIED ON THE PLANS. ARE RECOMMENDED WHERE F00T TRAFfIC OR BICYCLE ROL'''" 401 2 401 6 402 /All 2 2 8'0. 2!_7" g'-g!i "U" CONNECTING PIPE SECTION SEAL BOTH SIDES A —A ARE IN CLOSE PROXIMITY FRIENDLY AND SHALL 8. STEPS SHALL BE PROVIDED TO GRATE. THIS GRATE IS NOT ADA .COMPLIANT OR BI NOT BE PLACED DIRECTLY IN SIOEWALKSr CR0.5SWA1K5 OF WHEN INLET DIMENSION."H" IS EQUAL 10 OR GREAT ¢ 15'-4" I„ SECTION B —B INLET CONNECTED INLET TO A CROSS PIPE (FLOW FROM ON ONE a,raa THAN 3 FEET - 6 INCHES GRADE 3! %4" FLAT 9, SEE STANDARD PLAN DIRECTION) SECTION D -D I0. ALL INLETS SHALL NAVE AND SHALL GOrgi TO Afilit M 199. M-804-11, FOR REINFORCEMENT ARWND THE PIPE OPENING. A 4 INCH DTA METAL MEDALLION WITH A "ND DUMPOJG I` N0, 401 3-g" "U" MESSAGE ON IT. THE D IT SHALL BE FIRMLY MEDALLION SHALL HAVE A FTil SYMBOL WITH A BLUE BAC ATTACHED r0 THE TOP OF THE INLET WRH A PERMANENT INCREASE DIMENSION 6 IN41°R EACH 6 1N. INCREASE OF 'H° ABOVE 2 FT: 6 IN. IN CASES OF SKEWED P[PE, THIS DRAENS[ON SHALL BE SHOWN SKEW ON THE PLANS �PNGLE 3'/i' x %4" MEDIAN DITCH FLAT I REFERENCE: �/s" TYPICPL HEX. ROUND OR TWISTED CROSS BARS 6" SLOPE' ' C!. 'Din /z" PER FT. MAX. GRADE 3"x%" ' PER FT. MAX- FLAT SLOPE /p" I I ' ' I COLORADO DEPARTMENT OF TRANSPORTATION D STANDARD M-604-10. REFER STANDARDS, WITH MODIFICATIONS 4Ij4" CLASS OF CONCRETE A5 SHOWN (t'/q) GENERAL NOTES ON THIS DETAIL. TO LATEST M & S AT g IN. CTRS. WELDED TO TO THE 4" z /g BEARING BAITS A SPACED AT 23/g" CTRS. 3�-17�� " '''' IN THE l''''''')... IN. I 12" L NO. 402 I OR DITCH �4" CONCRE7E SLOPE AND DITCH PAVING INLET (REINFORCED) _ \^ \t `, 54 x 7.J BEAMS T- - CENTERLINE OF _ GRATE PARALLEL �ti yl fy7r,� X31 ;`i j ADO ONE BAR FDR EACH FT. INCREASE OF "H" ABOVE iN. CONNECTING PIPE (REQUIRES ... ..... 1.3 CU, ., .• ., q, -0n ■ ■ u ■ - i0 CENTERLINE 4" x 3/8' OF ROADWAY SPACED FROl4 EEACH OTHER,LY SECTION pEARING A -A B,e (3'/an) BAR 4" z ,' BAR 3i/e I/4" FLAT 3.x %' FLAT INLET CONNECTED TO A � CONCRETE SLOPE AND DITCH PAVING ¢I !! !! WILL OPEN SLOT fq (±/i ) x E LYE DerAI1 1N 3/," x %,!' FLArs E 4'(q" (tl/t'!) SAME AS IN STANDARD INLET CRATE SKEWED CROSS PIPE BE REQUIRED WHEN SHOWN ON INLET AT BOTTOM THE PVE Ilia I A&' I I II 3e GALVPNIZ[NG) CTRS. s %1s" ' 3" z. %4" FLAT -111 . OF VERTICAL CURVE 2s•�" (�/,9 (FLOW FROM TWO DIRECTIONS) STANDARD INLET GRATE SECTION E -E CLOSE MESH INLET GRATE Knowwher;.5elow. Grill bePore you tlig. Computer File Information Creation Date: Index of Revisions WELD COUNTY As Constructed INLET, TYPE C Project No./Code Dete: Comments: Imbals. I.` PUBLIC WORKBDEPARTMENT '1111 H. STREET }.,tt �:,, P.O. BOX 758 IuPil w;• GREFLEY,CO. 80632-0758 } '4"r` PHONE:((970)35&4000 FAX: (970/ 304-fi497 No Revisions: 07/31/2019 Last Modified Date, 07/312019 Full Palh: Draw ng Fle Name: Revised: goer: Desi COOT Detaler: COOT Sheet Sutuet; Sheet Subset: 1 of 1 Void: Sheet Numher of Aut.. Version: 2018 Scale: AS NOTED Units: English g pea! ;DS= R 4, ". SHOULDER o 4947559 Pages: 272 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Koppem, Clerk and Reoorder, Weld County , CO VIII 1irdQ Kr k19% WOAD& 11111 R. 3"x1/4"FLAT SLOT DETAIL ;111.0 x El; 107TD HOLE 6" ALTERNATE SLOT AND HOLD DOWN PLATE DETAIL GRATE INSTALLATION DETAIL DIKE - TRANSVERSE VIEW OPEN SLOT 41/4" al/q,) (TD FACLLITATEII 8" I GALVPNI2ING) 11 CTRS. 286f6" (t1/4") 12" MIN. 80" 47" 4I" - -y 6" 68 6" WALLS AND FLOOR (TYP:) AffDALLRIN GENERAL NOTES (SEE 1OTE 9 ) L INLET TYPE D I5 FIDT HS -20 RATED AND SHALL NDT 8E PLACED IN PAVED ROADWAYS. THIS INLET SHALL BE USED OP&.Y OUTSIDE PAYED ROADWAYS CONCRETE SHALL BE CLASS D.ItA_ET MAY BE GAST-BZ-PLACE DR PRECAST. #4 AT 3. SEE PLANS FOR SIZE AND LOCATION OF PIPE. 12" CTRS. 4 STRUCNRAL STEEL FOR GRATES AND GRATE INSTALIATIDN HARDWARE SHALL (TYP.) BE GALVANIIED AND SHALL 8E IN ACCORDANCE WITH SUBSECTION 712.08. STANDARD INLET GRATES SHALL DE USED DN ALL TYPE D INLETS UNLESS CLOSE MESH GRATES ARE SPECIFIED ON TIIE PLANS, INE:7YEEZRIERPrifTEr SARE RECOMMENDED WHERE FOIIT TOR BICYCLECONCRETE0.SE PROXIMITY TO GRATE, THIS GRAOT ADAPIPE DA, YCLE FRIENDLY AND SHALL NOT BEDIRECTLYSSWALKS OR DIKE PATHS. 3" MIN. 7. STEPS SHALL BE PROVIDED WHEN INLET DIMENSION "H" IS EDUAL TO CLEARANCE DR GREATER THAN 3 FEET -6 INCHES AND SHALL CONFORM WITH AASHTO M 199. 14" 14" #4 AT 12" CTRS. TRANSVERSE CROSS SECTION LONGITUDINAL CROSS SECTION LEVEL GRATE INSTALLATION 12" MIN, EARTHWORK ASSOCIATED f'l WITH DIKE INCLUDED W THE COST DF THE INLET LONGITUDINAL VIEW DIKE STANDARD INLET GRATE TWO STEEL GRATE PER INLET QUANTITIES N0. PIECES DESCRIPTION LENGTH LBS PER FT. WEIGHT (LBSJ S4 x 7.7 BEAM 31/2" x 1/q" FLAT 3" FLAT 40" 2656" 265a" 7.70 2.98 2.55 206 26 24 TOTAL LBS. - 256 811 x""w wl,al'"below. Call Ceiw"you ma. 47 REINFORCING BARS SHALL BE GRADE 60, EPDXY COATED, AND DEFORMED #4, AND SHALL HAVE A 2 INCH MIN. CLEARANCE. CUT DR BEND 'A ARWND PIPE AS REONRED, ALL INLETS SHALL HAVE A 4 WCH D10. METAL MEDALLDIN WITH A "NO DUHdPING GRAINS TD STREAM" MESSAGE ON IT. THE MEDALLION SNALL HAVE A F15H SYMBOL WITH A BLUE BACKGROUND. IT SNAIL BE FIRMLY ATTACHED TD THE IW.ET'S SURFACE WITH A PERMANENT FASTENER. " 6" AT' 12" CTRS. TRANSVERSE CROSS SECTION LONGITUDINAL CROSS SECTION SLOPING GRATE INSTALLATION 3," x I/4" FLAT )(a - 3" x 11q" FLAT 4" N 3/e' BAR \ ' x I/+" FLAT SECTION E -E E SLOT DETAIL IN 3%2" z 1/4" FLATS REFERENCE: �E 1/4" (₹1/4") SAME AS IN STANDARD INLET GRATE COLORADO DEPARTMENT OF TRANSPORTATION STANDARD -i -604t. REFERTTO LATEST 'LASS S CLOSE MESH GRATE OFACONCRETE S SHOWNINGENERAL CLASS NOTES ON THIS DETAIL OUTLET PIPE INSIDE DIA. 2.0 2.5 3.0 3.5 MIN. FT, 3.0 3.5 4.0 4.5 5.0 "H" FT, 3.0 3.5 4.0 4,5 5,0 5.5 6,0 6.5 7.0 7.5 8.0 6,5 9,0 9.5 10.0 80' 241/2" BOLT 31' CTRSTRS BOLT CTRS. PLAN VIEW (SHOWING ANCHOR BOLT LAYOUT) 1 CONCRETE CU. YD5. 1.5 1.7 1.9 2.0 2,2 2.4 2.6 2.8 2.9 3.1 3.3 3.5 3.6 3.8 4.0 STEEL LBS. 127 149 157 179 187 208 215 236 243 264 271 292 299 32D 327 CIRCULAR PIPE RANGE INSIDE DIA, IN, - "D" 18 18-24 18-30 18-36 18-42 18-42 18-42 18-42 18-42 1842 18-42 18-42 18-42 18-42 I8-42 19TIFTEETEiniFiE:P%E.. L RUPMITIES PREFOR ONE ENTIRETRIN Fqi VOLUMEOCCl�1ED BY PIPECLUDES A RING FDR THE MAXIMUM PIPE QUANTITIES FOR ONE INLET Computer File Information Creation Dale: Last Wed NW: 0 7/3112 01 9 Full Pak 07/3112019 A.CAD Version: 2016 Seale: AS NOTED Units: Eglish Index of Revisions Date: Commerils: Initials. WELD COUNTY As Constructed PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEV, CO. fi0fi32-0750 PHONE: (970) 356-4000 FAX: (970) 304-6497 INLET, TYPE D Project No./Code Void: Designer: COOT Deteler. COOT Sheet Subset: Sheet Subset: 1 of 1 Sheet Number 4947569 Pages: 273 of 285 03/05/2024 11;15 AM R F.a:$0.00 Carly Kopper, Clerk and Recorder, Weld INN Y��'PORWW'rCounty NIlhd til rY�rh �I II I A 6'-4n 11'-4" L=tO'-0'1 INLET PAY LENGTH PLAN VIEW CUT OFF OR BEND BARS TO CLEAR MANHOLE L='-0" 409 I6MANHOLE i4095 8" 403 L=5' RIR !L=10'OR 15',HZ' H>5' 801 T' CLR. 3,... "CLR. II' O.C 3" CLR. -`i F.- = 9" D.C. TYP L= I6'_4n _y " CLR. 405 4C6 4C5 406 405 408 III` 8" O.C. SECTION A -A REGULAR INLET Computer File Information 07/31/2019 Last Modified Date: 07/31/2019 Full Pall,: AutoCAD Version: 2018 Scale: AS NOTED Units. English I C. D -J C 411 D2� 2" CLR. NTIME:FTR FT, OR MORE, PROVIDESS AT BOTH ENDS W[TNHOLE RING AND COVERNT BNt ACCORDINGY. ♦ STATION POINT AT MIDPOINT OF INLET ALONG FLOWLME ENDS OF B C BEAM 3" GLR. FACE OF [3", EACH END TRANSiTIO GUTTER URB MEET SHAPE BF NORMAL BARRIER CURB AND CUTTER HERE. SEE CHANNEL LAYOUT ON SHEET 2. 11/2" BAR LONG 3" FCURB FACE 409 i (TYPPE 2 -SEC. NIB) OM 2:1 VU PIPE SPACER AND 11/4" LOCK NUT 3'z3"),, PLATE CURB FACE ASSEMBLY .PLACE ENTIRE ASSEMBLY BEFORE POURING CONCRETE. 413 REFERENCE: C0 00000 QE5000 NT OF SECTION A -A INLET FLAE, aRrFN STANDARD WITH DROP BOX ^/ H>5 FT. M-fi04-,z (SHEET 1 of 2) Index of Revisions Date: Comments: Initials: 3-411 I1" O.C. SECTIONS C -C & D -D (DOTTED BARS ARE IN Ow.. WELD COUNTY INLET BARRIER CURB FACE Na WHEN A TYPE R INLET 1S USED W[TH MOUNTABLE CURB AND GUTTER,5 FT. TRANSITION ` MOUNTABLE SHALL BE CONSTRUCTED. TRANSITION SNALL BE PAIb CURB FACE FOR AS CURB AVD GUTTER. MOUNTABLE CURB AND GUTTER TRANSITION GENERAL NOTES: SEE SHEET 2. TRANSITION CURB A- FORA 1'-0" PAN SLOPE 2" PER Fr. As Constructed PUBLIC WORKS DEPARTMENT 1111 .07 EET P.O. BOX 758 GREELEY, CO. e0fi32-0758 PHONE: 970) 356-4000 FAX: ( 70) 304-6497 4. 4.. 406 405 6" O.C. 6" O.C, SECTION B -B END VIEW 1 SLOPE 2% TO GUTTER 0.C CLR. NOTE: MANHOLE RING PND COVER, STATION PO]NT AND OUTFLOW PIPE SHALL BE LOCATED AT THE SAME END OF THE INLET. CURB INLET TYPE R 01 INLET STEPS REO'O.FOR ALL H 2 3'-6" 16" MAX. 407 9" O.C. 2" ALL AROUND 81 Nnow wnara below. Call bafare yo" aly. Project No./Code Void: Designer. COOT Detwiler. COOT Sheet Subset: Sheet Subset: 1 of 2 4947569 Pages: 274 of 285 03/05/2024 11:15 AM R Fee:$0.00 Carly Koppes, Clerk end Recorder, Weld County CO ■III pI��I�LIIt1wI.l�k��4��N�.�Wil TABLE ALL INLETS INLETS:H 5 5 FT. INLETS: H > 5 FT. GENERAL NOTES MARK SPACING TYPE 5 F5 FIENGTH r7 T Vr PIA,I. RETE SHALL BE CLBD. INLET MAY BE CAST -IN -PLACE OR PRECAST. SRE MBE Q' LENGTH N0. REQ'D. LENGTH N0. REGD. LENGTH N0. REQ'D. LENGTH N0. REQ'D6 SEE NOTE 11 2, CONCCRETE WALLS SHALL E FORMED ON BOTH SIDES AND SHALL I INCHE B S THICK. J 401 402 4 11" II IS � 21 4' 26 - kl * * 11 '� 3. INLET STEPS SHALL BE IN CONFORMANCE WITH AASHiO M 199. ` r ' ' r-',-, 4. CURB FACE ASSEMBLY SHALL BE GALVANIZED AFTER WELDING. 403 4 9" II 4'-0" 4'-0" 4'-0" 7 4'-0" 7 4'-0" • • ' T B.EXPOSED CONCRETE CORNERS SHALL BE razz. OF A INCH. CURB AID GUTTER CORNERS SHALL BE FINISFiEO TO MATCH THE EXISTING CURB A!✓D GUTTER BEYOND 405 6" VI 11 6'-10" 21 6'-D" 31 6'IO" 11 6' -ID" Ii 6'-k0" r-- -% - - o .--� THE TRANSITION GUTTER. B.REINFORCING BARS SHALL BE DEFDRMm AND SHALL HAVE A 2 INCH MINIMUM 406 407 408 4 4 4 6" 9" 12" VIII II II 7 3 8'-10" 5'-10" 6'-10" 7 13'-10" 10'-10" 7 W' 18'-10" 15'-10" 7 M-10" 5'-10" 7 #F 8'-10" 5'-10" '- C J �\ \ i CLEARANCE.ALL REINFORCING BARS SHALL BE GRADE 60 AND EPDXY GOATED. 7. DIMENSIONS AND WEIGHTS OF TYPICAL MANHOLE RING AND COVER ARE NOMINAL. 409 410 4 4 8" Ir. II VII 6 5'-10" 3 6 11'-10" 10'10" 3 6 16'-0" 15'-10" 3 6 11,0" 10'-10" 3 6 16'-0" 15'-10" B.MATERIAL FOR MANHOLE RINGS AND COVERS SHALL BE GRAY OR DUCTAE CAST •` J • • IRON IN ACCORDANCE WITH SUBSECTDN 712.06. 4U 412 4 4 Ii 11" II II 3 3 6-2" 3 3 10-2" �r 9. SINCE PIPE ENTRIES INTO THE INLET ARE VARIABLE, THE DIMENSIONS SHOWN ARE ` 1 r J' TYPICAL. AEBAli DIR4111ONST: AND QUANTITIES FOR CONCRETE AND REI17C5I MENT 11 �I SHALL BE AS REQUIRED IN THE WORK. QUANTITIES INCLUDE VOLUMES OCCUPIED BY 413 b 9" II 3 7 2'-g" 10'-9"" 3 7 2,..g" 15' 9" ,�r ` 1" y l �+ � 1" F— ism. T' 501 5 5'/2" IV II 3'-4" �7 1 10. STRUCTURAL STEEL SHALL BE GALVANIZED AND SHALL BE IN ACCORDANCE WITH SUBSECTION 712,06. 502 503 5 5 5%q" 5%2" III II 5 3'-6" 22 3'-4" 33 3'-4" 22 11 3'-4" 11'-5" 33 17 3'-4" 11'-5" PLAN VIEW 11. ALL MANHOLE COVERS SHALL BE CAST 0001000 DUMPING DRAINS TO STREAM" MESSAGE AND A FISH SYMBOL. THE SURFACE OF THE MANHOLE COVER SHALL 504 5 5%y" IX 16 3'-6" 27 3'-6" 6 3'-8" 6 5 3'-6" 5'-4" HAVE ANON-SLTP PATTERN. 231/e„ 601 6 2%" V 2 B'-10" 2 REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD 8'-10" 2 8'-10" 2 8'-10" 4 8'-10" M-604-12 (SHEET 2 OF 2). REFER 70 LATEST M & S STANDARDS, WITH MODIFICATIONS TO THE CLASS OF CONCRETE AS SHOWN IN .BC8.5 1 5'-IO" 1 SO' -10" 1 15'-10" 1 10'-10" 1 IS' -10" ELEVATION VIEW THE GE00000110 DETAIL. Z 8NI5.1 ♦ BNis, 3 RIffi a aIAS, S �a { BN5, 3 e taaa,s am5 23" 24" 23n MANHOLE COVER (TYP.) 2 $a BAR, $4 '14 •' ' VARIABLE REFER TO TABLE TWO.�1 u � INCLUDE $4,18 IN. BARS (SEE CHANNEL LAYOUT). REGULAR INLETS DROP BOX INLETS FOR 5 FT. INLET TABLE ONE', BAR LIST FOR CURB INLETS, TYPE "R" 35" 3s lip' ONE 1/Z !WHOLE Ig" saD" i 29" 24" 24" 24" 29" XII LENGTH N0.O(.. 00. KC.. L - 5 FT. L - 10 FT. L • 15 FT. $4 BARS'/Z 6" 12 12" 6" N "H" REGULAR DROP BOX I -I -I -I FOR 10 FT. MET 33/g" 401 402 410 403 407 403 407 CONC. CU. YDS. STEEL LBS. CONC. CU. YDS. STEEL LBs. CONC. CU. YDS. STEEL Les. 35" 30" 30" 35" 10 10 7 7 3.2 3.4 285 305 5,3 5.7 497 528 7.4 7.9 THREE t''/2 IN. HOLES 706 10'-10" 818.5 747 SECTION AT HOLE (TYP.) 12 12 9 9 3.7 3.9 326 334 6.0 6.4 559 571 8.4 8.6 PLAN VIEW 786 l7" 22" 22" 22. 24" 22. 22. 22" l7" 8 $48888 803 14 11 4.1 354 6.7 602 9.3 30" 844 1 1" 4° 2 "� 24/e' 4" 12' 12" 4"_ 4° 5'-6" 6'-0" 5'-2" 5'-8" 4'-2" 4'-8" 3'-Sn 15 13 15 6 4.4 375 6.0 607 7.4 850 _ 6'-8" 7'-0" 6'-2" 6'-8" S-2" 5'-8" 3'-U" 4'3" 4'-11" 16 IS 20 13 0 16 18 6 8 4.6 4.8 382 402 6.2 04 616 637 7.6 7.8 860 I 880 ,�� II 4I"(.-35"—�1�30"-+1.-30"-1-30"�-30"-�«-35"-+ F FOR 15 FT. INLET FIVE 1'/z IN. HOLES 7'-0" 7'-2" 6-2" 5'-5" 20 17 17 19 20 10 10 5.0 5.3 423 430 6.6 6.9 654 664 8.0 8.3 897 907 I I 15'-10" R 8'-0" 7'-8" 6'-8" 5'-11" 22 19 22 12 5.5 451 7.1 664 8.5 _I 927 CHANNEL LAYOUT DETAILS ,81 WEIGHTS: COVER = 125 L85, 8'-8" 9'-0" 8'-2" 8'-8" 7'-2" 7'-8" 6'-5" 6' -ii" 24 24 21 21 23 14 5.7 471 7.3 702 8.7 ELEVATION VIEW 944 +RING= 135 LBS. SEE CURB FACE ASSEMBLY ON SHEET 1. 9'-0" 9'-2" 8'-2" 7'-5" 26 23 24 26 14 16. 8.0 6.2 479 499 7.6 7.8 711 732 9.0 9.2 Ic""w wnae"belt 954 MANHOLE RING (TYP.) TOTAL= 260 LBS, Calleai"rey 974 10'-0" 9'-B" 8'-8" 7'-11" 28 25 27 16 6.4 520 8.0 749 9.4 992 TYPE II TYPE III TYPE IV TYPE V TYPE VI TYPE VII TYPE VIII TYPE X 10'-6" ll'-0" NOTES: FDR REGULAR DROP STEEL 10'-2" 10'-8" L=5 Fi. INLETS:TOTAL BOX WEIGHTS 9'-2" 9'-8" L=10 INLETS: TOTAL DO 8'3" 8'-U" FT., AND QUANTITIES QUANTITIES NOT INCLUDE -•••- 28 30 L=15 FT. NEEDED STRUCTURAL 25 27 ARE NEEDED ARE 28 30 OUTSIDE INSIDE STEEL CHANNEL. 18 20 HEAVY THE HEAVY a 6.7 6.9 BLACK BLACK 527 547 LINE. LINE. 8.3 8.5 759 779 17 9.9 1001 1022 LENGTH 31" X41" T' 2P, 502 8„ •'� 2g" U„1/21,.;1< 501 / T T 601 \ J 2" ' / 20" LL - - - _- 405 I--- 42"-.I i-�"t-1 IT VAR 410 20" -.I 406 ARV TES -.I r I IpI 34" 2;!'ll 504 l` I.- 44"- 4 •-•• BARS AND QUANTITIES VARIABLE WITH "H" WAR BENDING DIAGRAMS .v (DIMENSIONS ARE OUT —TO —OUT OF BAR) Computer File Information 07/31/2019 Last Modified Dale: 07/31/2019 Full Path: Drawing Fie Name: AuloCAD Version: 2018 Scale: ASNOTED Units: English Index of Revisions WELD COUNTY As Constructed Date: PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY, CO. 80632-0758 PHONE: (970) 356-4000 FAX: (iT0) 3046497 CURB INLET TYPE R Project No./Code Void: Designer. COOT Deb., COOT Sheet Subset: Sheet Subset: 2 of 2 Sheet Number of 4947569 Pages: 275 of 285 03/05/2024 11:13 AM R Fee:$A.00 Carly Koppee, Clark and Recorder, Weld County , CO IIIII MAW IghtillaliNHANAVIrkii1I II 1 8" rr�� IL CL GUTTERI TYPE 2 PLAN VIEW TYPE 13 INLET FOR GUTTER TYPE 2 4'-3," 403 19 8" O.C. SECTION A -A MAX = 30 IN. FOR H > 4 FT. L I 2 8" 402 x WENDING DIAGRAMS ALL DIMENSIONS ARE OUT -TO -OUT OF BAR. I� L 403 $l1 know wear:below. Call before you aiy. CORNERS RELIEVED %I6" TO PREVENT ROCK}NG (TYP.) REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-13. REFER TO LATEST M & 5 STANDARDS, WITH MODIFICATIONS TO TEHE CLASSOTES OF CONCRETE AS SHOWN IN THE NRAL N ON GETHIS DETAIL. WHEN HMA MATERIAL 1S TD EXTEND TO THE EDGE OF THE GRATING FRAME, CONCRETE MAY BE DEPRESSED. LC. SECTION B —B MAX = 18 IN. FOR ALL H 1/a" -I IQal.IY NO. 13 GRATE p 22v2�B p 31/4" IlAI I!A� A2IAI TAI IyIA l 481," 391/x" 40" I6" RADIUS MP.1 SECTION C -C B= C = 716f6" 1x 45" SECTION D -D 1 4- 391/8" I 2I3" t F+- NO.13 GRATING & FRAMES SECTION E -E APPROXIMATE WEIGHT = 590 LB5. 1 1�8 23" Lr TI - ---i 4,--N 23," 31," SECTION F -F GENERAL NOTES 1. CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. 2. CAST -IN -PLACE CONCRETE WALLS SHALL 8E FORMED ON BOTH SIDES. 3. E%POSED CONCRETE CORNERS SHALL BE CHAMFERED /4 OF A INCH. REINFORCING BARS SHALL BE DEFORMED �4 AND SHALL HAVE A 2 INCH MINIMUM CLEARANCE. :L REINFORCING OARS SHALL BE GRADE A60 "NCH EPDXY COATED. S7EPS SHALL BE PROVIDED WHEN INLET DIMENSION "H" IS EQUAL TO OR GREATER THAN 3 FEET -6 INCHES AND SHALL CONFORM TQ AASHTO M 199. 6. ALL GRAZES AND FRAMES SNALL DE GRAY DR DUCTILE CAST IRON IN ACCORDANCE WITH SUBSECTION 7(2.06, GRATES AND FRAMES SHALL BE DESIGNED TO W[THSTMIO HS 20 LDAQiNC. 7. STATION POINT IS AT THE CENTER OF THE INLET. 8. GRATE SHALL HAVE "DUMP ND WASTE DRAINS TO STREAM" MESSAGE CAST DN SURFACE. CONCRETE REINFORCING STEEL CU. YDS, 6 LB. 72 76 90 104 109 122 138 141 154 1'; MAXIMUM PIPE I.D. SEC. A -A IN 18 SEC. 8-0 3'-0" 3'-6" 4'-0" 1.3 1.5 18 18 30 30 30 30 5'-0" 5'-6" 2 18 6'-6" 7'-0" 7'-6" 2.5 168 173 187 200 205 219 30 30 30 2,8 3.0 10 11 12 8'-6" 18 18 3.3 30 10'-0" 13 IB B NCLUDES 1Y. FOR OVERR N. NOTE: CONCRETE QUANTITIES INCLUDE VOLUME OCCUPIED BY PIPE. QUANTITIES FOR ONE INLET MARK DIMENSIONS LENGTH 401 3'-6" 3'-41/z' 2'_2" 13'-4" 402 403 2'-7" 7'_2�JZu ADD 6 IN. TO THIS DIMENSION FOR EACH 6 IN. INCREASE OF "H" OVER 3 FT -0 IN. BAR LIST FOR H =3 FT. -0 IN. Computer File Information 07/31/2019 Last Modified Date: 07/31/2019 Full Palh: AuloCAO Version: 2018 Scale: AS NOTED Units: English Index of Revisions WELD COUNTY As Constructed Dale: PUBLIC WORKS DEPARTMENT 1111 H. STREET P. CO. BOX "7.7 80632-0758 PHONE: 970) 356-4000 FAX: ( 70)304-6497 CONCRETE INLET TYPE 13 Project No./Code Void: Designer COOT Detailer: COOT Sheet Subset Sheet Subset: 1 of 1 4947569 Pa9.s: 276 of 285 03/05/2024 11:15 AM R Fee:$0,00 Carly Koppel, Clerk and Reoorder, Weld County I CO lIII WONlinKFIRDAAO NiLl'Alik "Ill GENERAL NOTES: ALL WORK SHALL BE DONE IN ACCORDANCE WITH ME WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA. 2. CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. SECTION B - B BAR LIST FOR H=3'-0" AR 01 402 403 404 VARK 401 402 `4T. TYPE III III TYPE II to III N0. NO. REM, 7 3 a DI DIMEN 1•-0' 7—z ,/z" Z._g. INLET SIO 1-0" z'-tG t/z- R'-0 1/2' V2'_1' UBLE INLET SIONS LENGTH 14'-11 1/2' LENGTH 222'-0' '-2' 6,r 'A00 6" TC THIS DIMENSION FOR EACH 6" NCREgSE OF "H" OVER 3'-0" 45 9/16 5. ALL GRATINGS, FRAMES, RINGS AND COVERS SHALL BE CAST IRON. b. REINFORGNG BARS SHALL BE DEFORMED, GRADE 60, PER ASTM "1' AND SHALL HAVE A 2" MINIMUM CLEARANCE. 7. BARS MAV BE BENT OR CUT AT CULVERT ENTRANCES. 8: ALL CULVERTSSHALL BE SMOOTHLY GROUTED INTO THE WALLS OF THE BOX. I H' FOR INLETS WHERE H IS LESS hIAN 3'-0", REINFORCING IS SRLL REQUIRED AS DIRECTED BY THE ENGINEER. INLET FRAMES SHOWN ARE FOR SINGLE INLETS. TEETER #2502—A DOUBLE CURB INLET ONLY DOUBLE INLETS REQUIRE FRAMES WITH CLIPPED FLANGES WHERE THE TWO FRAMES ABUT. 10. INLET STRUCTURES SHALL NOT BE CONSTRUCTED UNTIL THE CURB AND GUTTER HAS BEEN INSTALLED, OR CONTRACTOR STAKES THE CURB & GUTIEH FOR 100' ON EACH SIDE 4 INLET. CONTRACTOR MUST ALSO STAKE INLET 80X CORNERS. 11. ADD (4) 4 171r —16 INCHES LONG (MIN) EQUALLY SPACED ANO 6" AT MID —DEPTH INTD THE TYPE 3 INLET CONCRETE ac 10" AT MID —DEPTH INTO EACH SIDEWALK SEC110N ADJACENT TO THE INLET (TYP L=5'). 4 ADDITIONAL BARS ARE REQUIRED FOR EACH 5' OF LENGTH ADDED FOR DOUBLE OR TRIPLE INLET. 12. ALL GRA1E5 AND FRAMES SHALL BE GRAY OR DUCTILE CAST IRON CONFORMING TO CDOT STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION -712.06. GRATES AND FRAMES SHALL BE DESIGNED TO WITHSTAND HS -20 LOADING. 13: MINIMUM CURB OPENING AREA = 150 50. IN. 14. MINIMUM REBAR SPLICE LENGTH SHALL BE 0". FACE OF 6" VERTICAL CURB AND GUTTER DEETER N0. 2502—A SINGLE, CURB INLET FRAME, GRATE, CURB & PARTIAL FRAME PLAN OF TYPE 3 INLET FOR VERTICAL FACE CURB. GUTTER & SIDEWALK SECTION THRU LENGTH 5 9/ 8'-6 e'-6 9'-0 1 1/2" CLR SEE NOTE 11 (FOR DOWELS) 2% SLO SECTION CENTER OF MULTIPLE INLETS TH 45 17/32' DUTLET PIPE ie 32' 42 32" REFERENCE: CITY OF GREELEY STORMWATER DETAIL 7-4A, JUNE 2008 tee" 144' DEETER #2502—A TRIPLE CURB INLET $ OF INLETS SINGLE DOUBLE TRIPLE STD. DEPTH (Y) MIN 0 (D) IN. SLOPE So 1.OD7. 1.80% 1.eo% FRAME AND GRATE FRAME AND GRATE SHALL BE A DEETER 2502—A OR EQUAL ""ValittroLig. Computer File Information Creation Date: JUNE 2008 Last Modified Date: JUNE 2008 Full Path: Drawing Fie Nams: AutoCAD Version: 2018 Scale: AS NOTED U,V8, English Index of Revisions Date. Comments: WELD COUNTY As Constructed PUBLIC WORKS DEPARTMENIT 1111 H. STREET P.O. BOX 768 GREELEY. CO. 80632A768 PHONE: 970) 366-0000 FAX: ( 70)504-6497 COMBINATION INLET TYPE 3 (FOR VERTICAL FACE CURB) Project No./Code Void: Designer: City of Greeley Detail., City of Greeley Sheet Subset: Sheet Subset: 1 of 2 Sheet Number III It I� I �i'4��4'�! I !J � Ifi IA'l�1r l IIII 00'0$:a.d WU 0T:TI R0M/0i0/T 0 GU 1° LIZ ;s"1''d 696061, GENERAL NOTES: 1. ALL WORK SHALL BE DONE IN ACCORDANCE WITH THE WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA. 2. CONCRETE SHALL MEET OR EXCEED METROPOLITAN GOVERNMENT ENGINEERING COUNCIL (MGPEC) SPECIFICATIDN5, ITEM 11, PORTLAND CEMENT CONCRETE PAVEMENT; SECTION 71.2, MATERIALS. CDOT CLASS D 4,500 PSI CDOT SPEC 601. 3. ALL CONCRETE SHALL 6E FORMED ON BOTH :SIDES. 4. ALL EXPOSED CONCRETE CORNERS SHALL BE CHAMFERED 3/4 >1- TYPE III. X ALL DIMENSIONS ARE OUT -TO -OUT BAR SECTION B - B - BAR LIST FOR H=3'-0" NARK 401 402 403 404 NARK 401 402 403 404 TYPE II III III TYPE II III III REO TYPE DIM TYPE OUBLE INLET DIMENSIONS 7'-2 1/2' 2'-10 1/2' 7'-1" r2'-01/2" 6' 6' ,NGTH LENGTH •ADD 6' TO THIS DIMENSION FOR EACH B" INCREASE OF "H" OVER 3'-0" 5 9/16" ACE OF DRIVE OVER CURB. LIP OF GUTTER DEETER N0. 2502-A SINGLE, CURB INLET FRAME, GRATE, CURB & PARTIAL FRAME PLAN OF TYPE 3 INLET/DRIVE OVER URB, GUTTER & SIDEWALK SECTION ALL GRATINGS FRAMES, RINGS AND COVERS SHALL BE CAST IRON. REINFORCING BARS SHALL BE DEFORMED, GRADE fi0, PER ASTM ;615, AND SHALL HAVE A 2" MINIMUM CLEARANCE. 7'. BARS MAY BE BENT OR CUT AT CULVERT ENTRANCES. ALL CULVERTS SHALL BE SMOOTHLY GROUTED INTO THE WALLS OF THE 80X. 42 42" 00 ASRDIRECTED BYRTHE ENGINEERmINLET FRAMES SHOWN ARE FORLSNG�ERINLET5 DEETER #2502-A DOUBLE CURB INLET ONLY DOUBLE INLETS REQUIRE FRAMES WITH CLIPPED FLANGES WHERE h1E TWD FRAMES ABUT. 10, INLET STRUCTURES SHALL NOT BE CONSTRUCTED UNTIL THE CURB AND GUTTER HAS BEEN INSTALLED, OR CONTRACTOR STAKES THE GURB f GUTTER FOR 100' ON EACH SIDE OF INLET. CONTRACTOR MUST ALSD STAKE INLET BOX CORNERS. 11. ADD (4)4 REBARS-16 INCHES LONG (MIN) EQUALLY SPACED ANO 8" AT MID -DEPTH INTO THE TYPE 3 INLET CONCRETE & iD" AT MID -DEPTH INTO EACH SIDEWALK SECTION ADJACENT TO THE INLET (TYP L=5'). 4 ADDITIONAL BARS ARE REgUIREO FOR EACH R. OF LENGTH ADDED FOR DOUBLE OR TRIPLE INLET. 12. ALL GRATES AND FRAMES SHALL BE GRAY OR DUCTILE CAST IRON CONFORMING TO CDOT STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION-120fi. GRATES AND FRAMES SHALL BE DESIGNED TO WITHSTAND S-20 LOADING. 50 SO. IN. THRU LENGTH 3/16" 2316" 3/16^ 5'-0" 12 2 REFERENCE: CITY OF GREELEY STORMWATER DETAIL 7-4A, JUNE 2008 DEETER #2502—A TRIPLE CURB INLET OF INLETS SINGLE DOUBLE TRIPLE STD. DEPTH (Y) MIN m (D) IN. SLOPE So IB" 00% 21 FRAME AND GRATE FRAME AND GRATE SHALL BE A DEETER 2502—A OR EQUAL "Wlitt'ehelOW. Cell hel"reyau dlg, Computer File Information Creation Dale: JUNE 2008 Last Modified Date: JUNE 2008 Fell Path: AA. Version: 2018 Scale: AS NOTED Units: English Index of Revisions WELD COUNTY As Constructed Comments: PUBLIC WORKS DEPARTMENT 1'111 H. BTREET P.O. BOX 758 GREELEY, CO. 80832-0758 PHONE: 970) 356-4000 FAX: ( 70)304-6497 COMBINATION INLET TYPE 3 (FOR DRIVE OVER CURB) Designer: City of Greeley Detail.: City of Greeley Sheet Subset: Project No./Code Sheet Subset: 2 or 2 Sheet Numb II I�IVa �'i 00 ' A;uno0 pieM JePJoo®a pue >Hey, seddoN RtJep 00'0S,eid a Nb 9t,tt tiZOZ/90/E0 99Z 9LZ 6961.14517 DR TD WITHIN 3" OF CYLNDRICAL DPENINI 3-ll03 z 5'-0" A 3" SPACE & 3" (OVER CYLINDRICAL OPENING) 501 & 502 MANHOLE BOX BASE ®®® 40l 4 1 /FT. IlEal......MINIE:2311111111 0.668 Off REQ'D. 16 18 iLENGTH Fii2. 8'-8" 97.2 104.2 18 8 " 9'-10" 1N.2 ?!.ii? l8 IB h01 11'-0 12'-2" a LENGTH = 32" + 2W + I.D. 132.3 146.3 402 4 III 0.668 rl(WEIGHT• i LENGTH D 5° 6'-0" IBI 20.0 6'_7" j'_p" 22.0 23.9 g'_4" .7 27.8 31.7 4112 BAR LENGTH = I.D+ 2W 501 5 T 1.043 t Li H'D fir WEIGHT W 5.' 8 -On 131.5 141.8 g ' y 2u 152. 162.5 l0'-4° 210-36 -0" 183.2 203.9 501 BAR LENGTH = 24'+ ID+ 2W 502 5 1 1.043 D. REQ'D. LENGTH ET 22 23 5'-0" 5'-0" 114.7 119.9 25 26 5'-0" 5'-0" 130. 135.6 29 32 '-0" E,' 51.2 [66.9 502 24+ID.+2W NUMBER BARS REOD. - 3 + 9 5n +1 503 5 A IA43 REQD. LENGTH WEIGHT 16 I6 Y 4.2 2239 18 18 282. 73 8 20 24 3285 423 5 503 '2JSSHI 0.+2W BAR LENGTHS 4'0-9'+2 51:1y+I p, �) +i ) 5 IS I 1.043 REO'D. LENGTH WEIGHT'W 12 14 8'-1 B'-8" 101.2 126.6 14 I6 9'-3" 9'-10" 35.1 164.1 18 20 N'-0" 12!-2" 206. 253.8 504 ?W+ID,-4 NUMBER BARS REo!D. - 2 +0 BAR LENGTH =32'42W+1D. 0 12" 1101 ]1 I 5.313 0. REQ'0. LENGTH WEIGHT to 4 4 7'-?" 7'-9" 152.3 184.7 4 4 8'-4" B'-11" 177.1 189.5 4 4 L1.3 11'-3 214.3 238.1 1101 BAR LENGTH' 21" + ID+ 2W 1102 n i 5.313 (NO. REQ'D. i LENGTH (WEIGHTM 4 4 56,7 56.7 4 4 2'-8" 2'-8" 56.7 6.7 4 2'-8" 56.7 56.7 28" . I y 1103 �©® (Nf2. REQ'0. LENGTH WEIGHT � 3 3 3 5'-0° 5'-0"" 79.7 79.7 79.7 3 3 3 5'-0° 79.7 79,7 79.7 TYPE II � 49" 16'4W+I.D/2 EICEEEMBENIZIMEMI 965.6 OINE® r r c®i 1,601.6 TYPE Ill V .4 .1 Y' CONCRETE - CuBIC YARDS - Toi, II NOTE: QUANTITIES ARE BASED ON SAME SIZE ;WE ENTRANCE BASE AND A 4 FT.MANHOLE ENTRANCE INTO WINES �®��® TO AND EXIT FROM, OF BASE. QUANTITIES FOR CONCRETE MANHOLE BOX BASE PLAN 9-401 502®5"CC. 503 ti PIPE 5010 5' CC. YEIN3ICAL1 503 9-401 SECTION A -A (STEEL IN BOTTOM OF BASE) THROUGH PIPE ONE LATERAL SHARP ANGLE ANGLED LATERALS GENERAL NOTES SINCE ALL PIPE ENTRIES INTO THE BASE ARE VPRTA8IE, THE DIMENSIONS SHOWN ARE TYPICAL.ACTUAL Dl1AENSI0N5 AND QUANTITIES FIX2 CONCRETE AND REINFORCEMENT SHALL BE 15 REQUIRED IN THE WORK. 2. Tail' FLAT TOP MAY BE USED ON ANY MANHOLE. THE ECCENTRIC CONE MAY BE USED WHEN THE MANHOLE "H" HEIGHT A/AT LEAST 8 FT. El(fifciE,,A,,,Errs:trEiTNIFIFITEFE SHALL BE SET IN ABED OFGROUTRROUNDED WITH A CEMENT GROUT INNCRETE COLAR IN PAVED AREA SEEND 3. 4. DESIGN OF BOX BASE IS BASED ON STRAIGHT RUNS OF PIPE OR CHANGE IN DIRECTION OF LESS THAN 45°.SPECIAL DESIGN IS REQUIREDGREATER. PRECAST MANHOLES AND RE1NFtlRCEMEMT SHALL CONFORM TO AASHTO M 199 (ASTM C 478). 6. CAST -(..ACE MANHOLES SHALL BE CLASS 8 CONCRETE. 7. STEPS SHALL BE REQUIRED WHEN THE MPNHDLE DEPTH EXCEEDS 3 FT: 6 IN. AND SHALL CONFORM TO AlSHTO M 199. ALL REINFORCING STEEL SHALL BE GRADE 60 AND EPDXY COATED. VERTICAL STEEL SHALL BE PLACED AT CENTERLINE OF WALL.Ata BARS SHALL HAVE A 2 IN. MIMMUM CLEARNiCE. ALL PIPE E14TRIE5 INTO THE BASE OF MANHOLE SHAH BE CONNECTED BY OPEN CHANNELIZATICNI ADJUSTED FOR PIPE SIZE, SHAPE, SLOPE, AND DIRECTION FLOW. DETAILS SHOWN ARE TYPICAL FOR INSTALLATIONS WITH ALL INVERTS OF SAME R0.ATIVE ELEVATION. FOR EXCESSIVE ELEVATION DIFFERENCE BETWEEN HAPN SD. FLOW CHANNELS AND INVERTS SHALL BE FORMED BY SHAPING WITH CLASS B CONCRETE OR APPROVED GROUT. 11. STUB-0UTS SHALL EXTEND 2 FT. MINIMUM BEYOND OUTSIDE WALL SURFACE OF MANHOLE AND BE SATISFACTORILY PLUGGED. 12. THE SLOPE OF THE MANHOLE COVER SHALL MATCH THE ROADWAY PROFRE AND CROSS SLOPE. • WHEN FINAL GRADE IS x1711 M SURFACE,RECE55 MANHOLE RING PND COVER I/�" MIN. TD I/2" MAX. REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-20 (SHEET 1 OF 3) REFER TO. THE LATEST M & 5 STANDARDS. TYPICAL CHANNELIZATION DETAILS Computer File Information Creation Dele, Lest Modi w Date: 07/31/2019 Full Palh: 07/31/2019 AutoCAD Version: 2018 Scale: AS NOTED Units: English Index of Revisions WELD COUNTY As Constructed Date: Cammenls: Initials. PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY CO. 60632-0758 PHONE: (970) 35fi-4000 FAX: (t 70) 304-6492 MANHOLES 811 Know.havbeloW. Call ner°ra you d19. Project No./Code Void: Designer: COOT [retailer: COOT Sheet Subset: Sheet Subset: 1 of 3 Sheet Number 4947569 Pages: 279 of 285 00/08/2024 11;18 AM R Fee:$0.00 Carly Kopp., Clark and Recorder, Weld County , Co VIII MO& ANN gitti: II B L PLAN SECTION C -C CAST -IN -PLACE SLAB BASE I , I$ 02. P 0� TYPICAL TIE BAR SECTION E -E PRECAST SLAB BASE MANHOLE RING AND COVER (RIM ELEVATION) FINAL GRADE IN UNPAVED AREA USE CEMENT GRADE RINGS DR BRICK COURSES WNEN FINAL GRADE IS PAVEMENT SURFACE, RECESS MANHOLE RMG AND COVER MANHOLE RING AND COVER A FINAL GRADE PRECAST FLAT TOP 4'DIA MANHOLE RISER SECTIONS PRECAST FLAT TOP FLAT TOP SECTION DETAIL MANHOLE RISER DETAIL SEE SHEET 3 FGR CONCRETE COLLAR OETARS GRADE RINGS OR BRICK COURSES v41% T"" WESGNT: APPROXIMATELY 4D0 LB5. SHALL BE GRAY DR DUCTILE CAST IRON IN ACCORDANCE WITH SUBSECTION 712.06. SECTION A -A MANHOLE RING AND COVER 83,1 Icnowwnarsbelaw. Cdll be/creyou dig. LEGEND SUITABLE SUBGRADE GRANULAR BEDDING MATERIAL CONCRETE REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-20 (SHEET 2 OF 3) REFER TO THE LATEST M & 5 STANDARDS. PRECAST MANHOLE BASES NOTES: I. THE BASE SLAB SHALL BE POURED MONOLITHICALLY WITH BOTTOM RISER SECTION. 2. PRECAST MANHOLE BASES Eilifs,Z,E:fcasTDWITIELD N REJECasBT NO COST TB TFIE AND LOCATIONS FOR WHICH S. ANY MANNA)LE BASE ORDER TD FIT THE LOCATIONS rEiE AND REPLACED BY PRECAST MANHOLE BASES SHALL BE BEDDED DN PN APPROVED GRANULAR BEDDING MATERIAL AS SHOWN ABOVE. Computer File Information Creation Date: Last Madifed D. 07/31/2019 Full Path: Drawing Fie Name: AutoCAD Version: 2018 Sc. AS NOTED Units English 07/31/2019 Index of Revisions Date: Initials: WELD COUNTY PU6LIC WORKS DEPARTMENT 1111 H. STREET P.O. 603{ 768 REELEY, CO. 80632.0768 PHONE: (970) 35 9?),70 FAX: (970) 304-6497 As Constructed MANHOLES Project No./Code Designer. COOT Detail., COOT Sheet Subset: Void: Sheet Subset: 2 of 3 Sheet Number 4947569 Pages: 280 of 285 03/05/2024 11:10 AM R F.a:$0.00 Carly Kopp., Clark and Recorder, Wald County CO VIII KIIIMVIIIMPANWO MIA II HI EitEPI1P'FNT HEIGHT IS 3 !N. (VtENT RMGS COMPATIBLETING MANHOLE RING BE USED TFTHE ENGMEER. C�'CRETE rALLNt DR FUlL DEPTH HMA PATCHING SHALL BE IN ACCORDPNCE WITH SECTIONS 403 OR 412 HMA PAVEMENT KTABTALE.N. S ORRETERTAL RINGS HMA PAVEMENT CONCRETE COLL OR FULL DEPTH PATCHMG BRICK COURSES, 2 MDL, 4 MAX. OR PRECAST CONCRETE GRADE RMGS PRECAST RISER S.= REFERENCE: COLORA00 DEPARTMENT OF TRANSPORTATION STANDARD M-804-20 (SHEET 3 OF 3J REFER TO THE LATEST M & S STANDARDS. i MORTAR THICKNESS MAY BE NONSYMMETRICAL TD MATCH CROSS LE OF ROADWAY. ADJUST MANHOLE 20 IN. OR LESS 12'. SLOPE 1%q" MIN- MAX 1/q SECTION F -F MODIFY MANHOLE GREATER THAN 20 IN. RECES FIE4',147- CONE.E MEASUREDARATELY, BUTD IN THE T-BASE T -BASE MANHOLES NOTES THE TATASE SECTION SHALL BE SHOP -FABRICATED FOR DELIVERY TO THE CONSTRUCTION SITE AS A COMPLETE UNIT. THESE OETAllS SHOW Of�Y THE CONCEPTUAL AND STANOPRD DIMENSIONAL REQUIREMENTS FOR TYPE T -BASE MANHOLES. THE CONTRACTOR SHALL FURNISH DETAILED SHOP DRAWINGS FOR APPROVAL PR10R TD FABRICATIDN.THE DETAILS SHOWN HEREIN PPPLY ONLY TO 48 1N. AND GREATER DIAMETER PIPES. EXCEPT FOR CLASS OF PIPE, SPECffICATIONS.- THE MANHOLE 'ALL" THE SAME AS THOSE REDUD2ED FOR THE POJOINING PIPE. TLIVTHE T -BASE SECTION SHALL MAINTAIN RS INTERNAL SHAPE AND FLOW AREA CROUTMG OR SHALL BE APPLIED SD AS TD NOT DISTURD TI NORMAL FLOW CR REDUCE THE AREA WHEN FINAL GRADE IS PAVEMENT SURFACE, RECESS MANHOLE RMG AND GOVER Jq" MIN. TD Viz" MAX. MANHOLE RING AND COVER CIRCULAR RIGID PIPE (LONGITUDINAL SECTION) CIRCULAR RIGID PIPE (TRANSVERSE SECTION) MANHOLE T -BASE 8,1 I(nowwhars below. Call6etore you aig. Computer File Information Creation Data: Last Modlged Date: 07/31/2019 FW Path: Drawing FiieNama: AutnCAD Version: 2018 Saele: AS NOTED Units English 07/31/2019 Index of Revisions Date: IniBals. WELD COUNTY As Constructed PUBLIC WORKS DEPARTMENT 111TH. STREET P.O. BOX 758 GREELEY, CO. 00632-0758 PHONE: (970) 35fi-40118 FAX: (978) 304-6497 MANHOLES Project No./Code Designer: COOT Retailer: COOT Sheet Subset: Void: Sheet Subset: 3 , 3 Sheet Number 4947588 Pages: 281 of 285 03/08/2024 11:18 AM A F'ss:$0,00 Carly Kopps•, Clark and Rsoordar, Weld County , CO liii iihniditiP Wyk 11111 OUTLET REQUIREMENTS WQCV SHALL BE RELEASED OVER 40 HOURS OUTLET WORKS SHOULD BE SIZED AND STRUCTURALLY DESIGNED TO RELEASE AT NO MORE THAN THE 1 -HOUR, 5 -YEAR HISTQRIC RELEASE RATE IN URBANIZING AREAS AND THE 1 -HOUR, 10 -YEAR HISTORIC RELEASE RATE IN NON -URBANIZING AREAS. OPENINGS IN THE SAFETY GRATE SHALL ALLOW ENOUGH FLOW TO PASS THE 5-YEAF OR 10 -YEAR HISTORIC FLOW (DEPEDENT SAFETY ON URBANIZATION CLASSIFICATION), USING GRATE A S0% CLOGGING FACTOR. STEEL FOR GRATES AND GRATE INSTALLATION HARDWARE SHALL BE GALVANIZED AND CONSTRUCTED IN ACCORDANCE WITH COOT SECTION 712.06. CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS, PER CDOT SPECIFICATION SECTION 601. REINFORCEMENT BARS SHALL 'LIES E PER CDOT SPECIFICATIONS SPACING AND SIZE TO BE DETERMINED BY CONSULTING DESIGN ENGINEER. STEPS SHALL BE PROVIDED WHEN HEIGHT IS GREATER THAN 3'-6" AND SHALL CONFORM TO AASHTO M 199: OUTLET STRUCTURE PLAN VIEW WQCV ORIFICE PLATE (HOT -DIPPED WQCV WSEL OUTLET PIPE 12" MIN,. "__-1 I I- 1 1 1;1,11 1 1;: l SECTION A.A. WQCV ORIFICE PLATE HOT -GIPPED GALVANIZED STEEL SECTION B -B' EMERGENCY SPILLWAY OVERTOPPING SPILLWAY WATER SURFACE 100 YEAR WSEL COMPACTED EARTH 95°lo STANDARD PROCTOR DENSITY 8,1 Knowwhars y 1tom you ct O81hetli, FED RIPRAP (DEPTH = 2 x Deo ) F SLOPE GEOTEXTI,EFDT IC MIRAFI F"'"° OR APPROVED EQUAL LDW TAILWATER BASIN IF VELOCITY EXCEEDS 2 FPS SIDE VIEW EMERGENCY SPILLWAY REQUIREMENTS EACH DETENTION POND SHALL CONTAIN AN EMERGENCY SPILLWAY CAPABLE OF CONVEYING THE PEAK 100 -NEAR STORM AT A DEPTH OF SIX (6) INCHES OR LESS. BUft1ED OR GROUTED RIPRAP SHALL BE PLACED FORM THE EMERGENCY SPILLWAY DOWNHILL TO THE EMBANKMENT TQ6 QF SLOR6 AND COVERED WITH SIX (6) INCHES OF TOPSOIL, IF BURIED. THE RIPRAP MUST BE SIZED AT THE TIME OF FINAL ENGINEERING DESIGN. GROUTING OF THE RIPRAP MAV BE REQUIRED. IN ORDER TO PREVENT DAMAGE TO PUBLICLY -OWNED INFRASTRUCTURE (ROADS, ROADSIDE DITCHES), A CONCRETE CUTOFF WALL EIGHT (8) INCHES THICK, THREE (S) FEET DEEP, AND EXTENDING A MINIMUM OF FIVE (5) FEET INTO THE EMBANKMENT ON EACH SIDE OF THE SPILLWAY OPENING IS REQUIRED ON ALL DETENTION PONDS. THE EMERGENCY SPILLWAY ELEVATION MUST BE TIED BACK INTO THE TOPOF THE EMBANKMENT USING A MAXIMUM SLOPE OF 4:1. CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS, PER CDOT SPECIFICATION SECTION 601. Computer File Information Creation Dale: Last Modified Date: 11712/2020 Full Path: Drawing File Name: AuteCAD Version: 2018 Scale: AS NOTED Units: English Index of Revisions WELD COUNTY As Constructed D. Initlals: PUBLIC WO1 H. STRERKS DEPARTMENT 111T P.O. BOX 758 GREELEV, CO. 80632-0758 PHONE: l970) 35fi-0000 FAX (870)304-6497 OUTLET AND SPILLWAY DETAILS Project No./Code Void: Sheet Subset: Sheet Subset: Sheet Number 11111 'M!I'R1�'4�4J�I�Y' +1r' i 1�I .1 ti IIi AMMAN III 00 +t;Ul'1O� NToM iJap4oa'a PAM 31A'T0 'MOddo) AT.IMO 00'0':0.4 a WI ST. Ti pause/F0 SSE JO ZOZ :sexed 69SLb6b PLAN C --I D1a A pipE DIMENSIONS ID. AI CIL I E 18 24 30 36 10 10 14 18 24 28 30 36 34 78 70 96 96 96 48 60 72 78 84 90 96 108 36 96 96 REINFORCED CONCRETE CIRCULAR PIPE SECTION X -X END VIEW 4► -X END SECTION FOR REINFORCED CONCRETE CIRCULAR PIPE COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-603-10. REFER TO LATEST M&S STANDARDS, REFER TO M60310 FOR EWPTICAL PIPES. D OR 2' MIN 3 MIN' TOEWALL NTS ifisWE:BssEiVIDNEE' E 4;500 PSI CLASS D CONCRETECKNESS. TOEWALL REINFORCEMENTED BY THE ENGINEER OR APPROVAL BY THE COUNTY, OR 2. MIN EXTEND RIPRAP TO HEIGHT OF PIPE OR BOX, MIN. D. OR 2' MIN RIPRAP MORE THAN 1.0' ABOVE PIPE INVERT SHALL BE INSTALLED " BELOW FINISHED GRADE AND BURIED WITH TOPSOIL PLAN NTS END TREATMENT MAY CONSIST OF RCP END SECTION (WITH TOEWALL) OR HEADWALL TOEWALL 8" THICKNESS 3' MINIMUM DEPTH GEOTEXTILE EROSION CONTROL. MIRAFI 300 OR E4UAL 205,, MIN PROFILE NTS SOIL RIPRAP 'X VOID—FILLED RIPRAP 81 Icaewwtar:below. Cell before you dig. Computer File Information Creation Date: 12/14/2020 Leat maned Data: Full Path: AutdCAD Version: 2018 Scale: AS NOTED Units: E08liah Index of Revisions Date: comments: Initials. WELD COUNTY As Constructed PUBLIC WORKS DEPARTMEM 1111 H. STREET P.O. BOX 758 GREELEV, CD. 80632.0756 PHONE: (970) 35&4000 FAX: (070) 304-6487 RIPRAP APRON DETAIL Project No./Code Void: Sheet Subset: I Sheet Subset: ...Number III It'ril��i fi�I1I�M711'dflf�I Bill l'�I r� lIII 03 . c;uno0 pT'M l.aap.ioo*d pule f.rot0 'seddox AHHjtp ;9z 3 £8 : staid ti t VZ69SLti6t EDGE OF DRIVING POINT OF SURFACE (FLOWLINE) / rrsiMECTIDN 40' // NOTE: 1. ROADS SHALL NOT HAVE VISIBLE IMPEDIMENTS BETWEEN 3 FEET AND 8 FEET IN HEIGHT AT SUBDIVISION INTERSECTIONS WITHIN A TRIANGULAR AREA AS SHOWN ABOVE. EpGE OF DRIVING SURFACE (FLOWLINE) SUBDIVISION ROADS SIGHT DISTANCE NOTES: DISTANCE oz IS EQUAL TO DISTANCE ar PLUS THE WIDTH OF THE LANES) DEPARTING FROM THE INTERSECTION ON THE MAJOR ROAD TO THE RIGHT. el:IrEr,,,Tifr!"-E.;-',Esd;'NNF/111,;c1FSIPA:TN,L:4,7FP:MEASUREMENT OFDISTANCE a� AND DISTANCE as FOR DEPARTUREDEPENDS ON THE PLACEMENT OF ANY MARKED STOP LINE THAT MAYTHUS, MAY VARY WITH SITE -SPECIFIC CONDITIONS.IN WELD COUNTY, ANCE BEHIND THE TRAVELED WAY TO THE STOP BAR IS 14 FEET, 4. ADDITIONAL INFORMATION REGARDING SIGHT DISTANCE FOR INTERSECTIONS ANO CASES OTHER THAN THE STOP CONTROL CONDITION CAN BE FOUND IN AASHTO'5 A POLICY ON GEOMETRIC DESIGN OF HIGHWAYS AND STREETS Clear Sight Triangle Decision Poin Major Road Major Road a#1 Departure Sight Trlangla for Viewing Traffic Departure Sight Triangle for Viewing Traffic Approaching the M1nor Road from the Left Approaching the Minor Road from the Right DEPARTURE SIGHT TRIANGLES INTERSECTION (STOP CONTROL) bi _ Weld County Re Clear Sight Trlangla Decision Paint Departure Sight Tnangle for Mewing Traffic Departure Sight Triangle for Viewing TreHic Approaching the Access/Driveway from the Lan Approaching the Acea griveway from the Right DEPARTURE SIGHT TRIANGLES AT ACCESS (STOP CONTROL) Access Sight Distance b = 1.47 a Vm,i„ + is Vm,p, = Design Speed of major rood (MPH) to = time gop needed for vehicle entering major road (sec) is — 7.5 Cor, 9.5 Single —Unit Truck, 11.5 Combo —Unit Truck +0.5/extra lane for cars +0.7/extra lane for trucks Put know wners below. Gail before you dlg. Computer File Information Destine Date: Lest Modified Dale: 11/12/2020 Full Pale AutoCAD Version: 2016 Scale: AS NOTED Units:. English Index of Revisions WELD COUNTY As Constructed Date: PUBLIC WORKS DEPARTMENT 1111 H.STREET P.O. BOx 756 GREELEY, CO. 60632-0758 PHONE: (970) 356-4000 FAX (970] 304-6497 SIGHT TRIANGLES Project No./Code Void: Sheet Subset: Sheet Subset: lull Y lIN71�i1�1'94�Ifilt��+40110740ill tWVIr��YIII 03 ' Aluno3 PToM I Jop.ioosN pus )0, t • ddoN RT.Is3 00.0$,..4 Z fo sb9Z ; timed, t bz69SLb6t EXISTING GROUND ELEVATION SECTION 70'. MIN. SECTION B -B 81 nnow whafsbelow. Call before you Elg. NOTES: 1. AGGREGATE SHALL COOT SPECIFICATIONS, SUBSECTION 208.02 (I) 2. THE CONTRACTOR :U;D;;NiNiET;TH CT CURBANOPAVEMENT, OREDGEF GRAVELR IS ADAJA!A!pyRAI CE FROM DAMAGE,WHILE NOT ER. INHETING DITCH,AULVERT ISOF THEADLMENTIONEDBOVESHALL BE INCE COST OF THE WORK AND NOTFORSEPARATELYALLMATERILSANO LABOR TO COMPLETE THE VEHICLE TRACKD SHALL BE CUDEDINTECOST OF THE WORK AND NOT PAID FOR SEPAR. REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M -20B-1, WITH MODIFICATIONS. Computer File Information Creation Dale: Last Modified Cate: 11/12/2020 Full Path: AutoCAO Version: 2018 Scale: AS NOTED Units. English Index of Revisions WELD COUNTY As Constructed Date: Comments: PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 -wan, No Revisions: VEHICLE TRACKING PAD (TEMPORARY ACCESS) Project No./Code Designer. Void: Sheet Subset: I Sheet Subset: Sheet Number 4947569 Pekes: 285 of 285 03/05/2024 11:15 AM A Fee:$0.A0 Carly Koppel, Clerk and Recorder, Weld County , CO VIII KM 0111VI wmwwhmehelow. Call before you dlg. NEW ASPHALT 24" MIN. SAW CUY AND REMOVE ASPHALT 2" DEPTH EXISTING ASPHALT Qa��Qa eG !\\\\\\\\\\\,\\ •\\' \\\\\A\'\ SAW T DTHER METH00CUATAPPROVED SAW CUT ASPHALT OR "T -JOINT" DETAIL NOTES: PAINT THE EDGE WITH DILUTED EMULSIFIED ASPHALT (SLOW SETTING) PRIOR TO PAVING OPERATION. APPLY TACK (C55-ih) TO Tr1E MILLED OR SAW -CUT EDGE PRIOR TO PAVING OPERATIONS. 2. RATE OF APPLICATION SHALL BE AS DETERMINED BY THE ENGINEER AT THE TIME OF APPLICATION, CSS-1h SHALL BE APPLIED AT 0.10 GAL/SY. A DIFFERENT APPLICATION RATE SHALL BE APPROVED BY WELD COUNTY. Creation Date: Lest Modified Date: 11/12/2020 Full Pak DraWing File Name: AutoCAD Version: 2018 Srale: AS NOTED Units: English Computer File Information Index of Revisions WELD COUNTY As Constructed Date: Initials. PUBLIC WORKS DEPARTMENT 1111 H. STREEr PO. BOX 755 GREELEV CO. 60632-0758 PHONE: (970) 35&4000 FAx: (970) 304-6497 SAW CUT ASPHALT OR "T -JOINT" DETAIL Project No./Code Vold: Designer: Detwiler: Sheet Subset: Sheet Subset: Sheet Number 1,(1-.;-/-a7 4,e) pd ,mom 2 ,,env WELD COUNTY CODE ORDINANCE 2023-16 //f/oW- IN THE MATTER OF REPEALING AND REENACTING, WITH AMENDMENTS, CHAPTER 8 PUBLIC WORKS, OF THE WELD COUNTY CODE BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF THE COUNTY OF WELD, STATE OF COLORADO: WHEREAS, the Board of County Commissioners of the County of Weld, State of Colorado, pursuant to Colorado statute and the Weld County Home Rule Charter, is vested with the authority of administering the affairs of Weld County, Colorado, and WHEREAS, the Board of County Commissioners, on December 28, 2000, adopted Weld County Code Ordinance 2000-1, enacting a comprehensive Code for the County of Weld, including the codification of all previously adopted ordinances of a general and permanent nature enacted on or before said date of adoption, and WHEREAS, the Weld County Code is in need of revision and clarification with regard to procedures, terms, and requirements therein. NOW, THEREFORE, BE IT ORDAINED by the Board of County Commissioners of the County of Weld, State of Colorado, that Chapter 8 of the Weld County Code be, and hereby is, repealed and re-enacted, with amendments, to read as follows. CHAPTER 8 PUBLIC WORKS ARTICLE I - Snow and Ice Policy Amend Sec. 8-1-20. Snow watch plan. A. During normal working hours, sanding and/or plowing operations may be initiated by the Director of Public Works or the on -duty Snow Boss. B. In order to ensure that sanding/plowing operations are initiated in a timely manner at other than normal working hours, feedback regarding road conditions by Sheriffs Office Deputies and any other agency, including the Colorado State Patrol, shall be sent to the Weld County Regional Communications Center (WCRCC). The WCRCC shall then notify the scheduled on -duty Snow Boss. The Snow Boss shall then initiate sanding/plowing operations accordingly. Amend Sec. 8-1-30. Snow removal priorities. A. Priorities: Clearing of roads shall occur according to the following order of priority: 1. thru 6. — No change. PAGE 1 2024-0065 ORD2023-16 7. Collector roads. 8. Local roads, including subdivisions and unincorporated towns. B Comm unications Command and control. 1. — N ) change. 2. Control of operations shall be exercised at the Public Works Department Operations Center (PWDOC). Communications between Snow Boss and operators shall be according to the following methods: 1) County Radio System; 2) cell phone; 3) CB radio. The Director of Public Works shall be in charge of snow removal operations and shall staff the PWDOC as necessary to carry out operations efficiently. This authority shall be delegated to the assigned Snow Bosses. 3 Any calls for emergency services received at the PWDOC shall be forwarded to the appropriate agency. 4 All incoming calls regarding snow removal or emergencies shall be routed to the PWDOC from dispatch or in-house Public Works staff. C. Operations. 1. — Nc change. 2. If weather information indicates that operations are anticipated in advance of the approaching storm, the Director of Public Works shall direct specific operators to be at work and ready to commence operations as soon as practical. If more than two (2) days of continuous operations are anticipated, no operator shall work more than twelve (12) hours in a day without approval of the Director of Public Works. 3 Status of all snow removal operations shall be maintained at the PWDOC. Reports shall be made to the Public Works Emergency Notification Group intermittently throughout the snow event. These reports shall be directed by the Director of Public Works or on -duty Snow Boss. 4 — Nc change. If an abandoned vehicle is blocking the roadway, the operator shall radio in the location, license plate number and description of the vehicle to the PWDOC. The PWDOC shall contact the Regional Communications Center, informing the Dispatcher that a hazard exists and the vehicle should be removed from the County road right-of-way. Dispatch shall contact the Weld County Sheriff's Office for appropriate action. 6 No school property or private roads or driveways off the County rights -of -way shall oe cleared by County equipment, with the following exceptions: PAGE 2 2024-0065 ORD2023-16 a If requested in writing, by a school district, and approved in advance by the Board of County Commissioners b — No change 7 Plow trucks shall primarily be used to remove snow and ice on paved roads and have designated routes or zones but may be assigned otherwise as needed 8 Repair and maintenance of all Public Works equipment shall be furnished by the Weld County Department of Fleet Services during a snow event Personnel shall be on standby or on duty, as directed by the Director of Fleet Services 9 — No change D Planning and preparation 1 All supervisors of units providing snow removal are responsible for ensuring that equipment is ready and personnel are briefed on their duties Prior to a snow event, each piece of equipment shall be inspected with its plow and spreader to ensure readiness All other equipment, such as tire and tow chains, route maps and vehicle lights, shall also,be inspected at this time 2 Fuel stocks at outlying satellite facilities shall be monitored by the individual zone operators immediately prior to a snow event and status reported to Fleet Services If a fuel delivery is necessary during a snow event, the Snow Boss may direct the delivery route be cleared on a priority basis Amend Sec. 8-1-40 Contracting for additional resources In cases of EXTREME EMERGENCY and where County resources cannot maintain safe traveling conditions, it may be necessary to obtain additional equipment from Contractors A Authorization for contract 1 — No change 2 The Director of Public Works or authorized agent of the Board of County Commissioners shall follow the emergency procurement process in Chapter 5 of the Weld County Code B Contracted equipment command and control Control of contractor equipment shall be exercised through the PWDOC The Director of Public Works or the on -duty Snow Boss shall coordinate and control the efforts of all contractor equipment PAGE 3 2024-0065 ORD2023-16 C. Operations. 1. County and contracted workforces shall be employed to maximize the efficiency of the snow removal operation. Contracted equipment may be paired with County equipment to take advantage of County radio control. 2. As soon as it is apparent that County forces can manage resources for the remaining snow event, the Director of Public Works shall terminate contractor operations. 3. No change. 4. Contractors shall submit invoices to the Department of Public Works to receive payment for time and costs. Amend Sec. 8-1-50. Response plan for extreme snow and ice events. The fo lowing policy sets in place criteria for managing snow and ice removal efforts on the County roadway network during extreme weather events. A. Weather event definitions. Snow events are categorized using a storm level scale based on reports from the field as to the severity of conditions, as well as other methods, including forecasts, satellite images, weather stations and common sense. With the vast expanse of Weld County, storm levels may vary depending on conditions in that area. The levels of storms are defined below: 1. Level 1: Extreme weather conditions. Snow removal efforts shall cease, and equipment shall retreat to designated recovery stations located throughout the County for further instructions and redeployment as conditions warrant. Level 1 may be declared by the on -duty Snow Boss with the concurrence of the Director of Public Works, the Commissioner Coordinator or Alternate Commissioner Coordinator for Public Works. When redeployed, resources shall be committed to predetermined priority snow routes. Notification of a Level 1 Condition or any road closures shall be communicated to the Regional Communications Center and the Public Works Emergency Notification List. Level 2: Snow Removal Operations shall focus on snow removal priorities as identified in Section 8-1-30(A). Some roads may be closed: and traffic rerouted so snow removal vehicles can operate unimpeded by traffic. The on -duty Snow Boss shall refer to Section 8-1-30 of this Code. 3 Level 3: Snow Removal Operations shall focus on all roads. The effort and resources expended shall vary depending on accumulation and drifting conditions. The on -duty Snow Boss shall refer to Section 8-1-30 of this Code. PAGE 4 2024-0065 ORD2023-16 Amend Sec. 8-1-60. No waiver of governmental immunity. No term or condition set forth in this Article shall be construed or interpreted as a waiver, express or implied, of any of the immunities, rights, benefits, protections, or other provisions of the Colorado Governmental Immunity Act, Section 24-10-101, et seq., C.R.S., as applicable. Furthermore, nothing set forth in this Article shall be construed as creating a duty of care upon any individual or party. Add Sec. 8-1-70. No expectation of service to any specific person or property. The provisions stated in this Article are not intended to, nor shall they, create in any specific person or property a right to expect a certain level of service, even if such level of service is described herein. Amend ARTICLE II — Improvements Agreements Sec. 8-2-10. Reserved. Sec. 8-2-20. Improvements Agreements. Depending on the land use USE project, there are several different types of possible Improvements Agreements that may be required. It is the intent that Improvements Agreements will be in place prior to final approval of the use. Construction of any safety improvements are intended to be completed prior to operation or issuance of building permit(s). A. An Improvements Agreement reference may be used interchangeably and include. but is not limited to immediate off -site and/or on -site improvements, future triggered improvements, and road maintenance criteria. (All categories may or may not include a proportional share based on locations and existing background traffic.) B Agreement Types include: 1. Improvements Agreement (IA). This agreement is for projects that include future triggered improvements. Typically includes a standard road maintenance section for items such as dust suppressant or pavement damage repair. If applicable, will include a proportional share component for any future improvements done by the County on the haul or travel route. 2 Offsite Improvements Agreement (OFFSIA). These agreements include immediate off -site improvements. Immediate safety improvements may include; but are not limited to, adding auxiliary lanes, intersection improvements, paving of gravel road, or widening of a road. These agreements will require project and warranty collateral and will also include all components described in the improvements' agreements. PAGE 5 2024-0065 ORD2023-16 3. On -Site Improvements Agreement (ONSIA). These agreements require immediate on -site improvements intended for public use but privately maintained, which may include. but are not limited to, dedication of rights -of -way for public use, construction of an internal roadway, and/or construction of irrigation or stormwater ponds 4 Road Maintenance Agreement (RMA). A Road Maintenance Agreement includes items addressing routine road maintenance, including but not limited to, dust suppressant if on a gravel road and pavement damage repair if on a paved road. There will also be a proportional share component for typical road maintenance improvements performed by the County specifically identified to the haul and travel routes related to the project. 5 Road Maintenance During Construction (RMCA). These agreements are similar to the Road Maintenance Agreement but are limited in time. Often used for transmissions lines, solar energy facilities and other land use projects where the heavy traffic impact on the roads is limited to the construction of the facility/use. These agreements will still include a proportional share component for routine road maintenance improvements performed by the County on the haul and travel routes related to the project. Pre and post construction inspections are required for these agreements. Sec. 8-2-30. Collateral. A. Improvements Agreements requiring collateral as financial assurance that the obligations of the Agreement will be completed (including; but not limited to, Subdivision and Development Improvements Agreements for major and minor subdivisions and Development Improvements Agreements for Planned Unit Developments) shall generally conform to this Article II. B. The County requires applicants to provide acceptable collateral to guarantee all of their obligat ons under the associated Improvements Agreement in the following forms: (1) Project Collateral for completion of all improvements described in the Improvements Agreement; and (2) Warranty Collateral to ensure all public improvements uphold their functionality during the warranty period. C All references to "Acceptance of Improvements" shall refer to the County confirming completion of the improvements according to the accepted Construction Plans. By accepting any improvement, the County does not thereby accept it for purposes of future maintenance, nor does the County accept any present or future responsibilities or obligations relative to the improvements. D The Bcard of County Commissioners reserves the right to reject collateral that it deems inapprc priate or insufficient. E Release of collateral is the sole discretion of the Board. PAGE 6 2024-0065 ORD2023-16 Sec 8-2-40. Acceptable types of collateral. The three (3) types of collateral listed below are acceptable to the County An irrevocable letter of credit from a federal- or state -licensed financial institution that has at least a three -star rating given by Bauer Financial consistent with a sample form supplied by the County The Board may require the applicant to obtain replacement collateral if the rating of the financial institution providing the collateral drops below this level, which shall be submitted within sixty (60) days of the Board's notice to the applicant that the rating has fallen and that the collateral must be replaced The applicant may not terminate existing collateral until replacement collateral has been secured 1 The letter of credit shall provide for payment upon demand to the County if the applicant has not performed the obligations specified in the Improvements Agreement and the issuer has been notified of such default or if, after the County has received notice that the letter will not be renewed as set forth below, the County notifies the issuer that the applicant has not provided adequate replacement collateral and the County intends to demand payment, regardless of whether applicant is then in default 2 The issuer of the letter of credit shall guarantee that, at all times, the unreleased portion of the letter of credit shall be available, to the County for the purpose of completing the uncompleted improvements enumerated in the Improvements Agreement 3 The letter of credit must stipulate that it will automatically renew and shall remain in full force and effect until released by action of the Board, or until after the Board has received a minimum of sixty (60) days' written notice from the issuer of the letter of credit of the pending expiration The notice shall be sent by certified mail to the Clerk to the Board B A surety bond given by a corporate surety authorized to do business in the State and having at least a B+ rating given by A M Best The Board may require the applicant to obtain replacement collateral if the rating of the financial institution providing the collateral drops below this level, which shall be submitted within sixty (60) days of the Board's notice to the applicant that the rating has fallen and that the collateral must be replaced The applicant may not terminate existing collateral until replacement collateral has been secured C A cash deposit made with the Board Sec. 8-2-50. Project Collateral. A The value of Project Collateral submitted to the County must be equivalent to one hundred twenty-five percent (125%) of the value of the improvements identified on the accepted Construction Cost Estimate exhibit to the Improvements Agreement PAGE 7 2024-0065 ORD2023-16 B. The Project Collateral shall be submitted with a signed Improvements Agreement includ ng all required exhibits. The complete submittal is subject to final approval by the Board and shall be recorded at the Office of the Clerk and Recorder by the Clerk to the Board upon approval. Unless otherwise set forth in the Improvements Agreement Construction Schedule exhibit, the improvements shall be completed within three (3) years of execution of the Improvements Agreement. Otherwise, the Board, at its discretion, may make demand on all or a portion of the collateral and complete the improvements or partially complete the improvements, which may include, at the Board's discretion, contracting to have the work completed by a third party. D. Project Collateral may be provided separately for on -site and off -site Improvements. Sec. 8-2-60. Release of Project Collateral. A. Upon completion of the improvements in accordance with the Improvements Agreement, the developer shall notify Weld County, so staff may inspect the improvements. B Follow ng preliminary approval by County staff, the developer shall present a Statement of Substantial Compliance signed and stamped by a Colorado Professional Engineer licensed to do business in the state and a request for release of collateral. The Statement of Substantial Compliance shall certify the work has been completed in substantial compliance with approved plans and specifications, or that any material deviations have received prior written acceptance from the County; and the engineer or his or her representative has made regular on -site inspections during the course of construction and the construction plans utilized are the same as those accepted by the County. C "As-bu It" plans are required for all public improvements, which may include but are not limited to, public rights -of -way, permanent easements, or on -site drainage features. _As -built" plans shall be stamped by a Colorado Professional Engineer licensed to do business in the state certifying the project is in substantial compliance with the plans and specifications and shall be submitted at the time the letter requesting release of collateral is submitted. D For improvements to public rights -of -way or permanent easements, materials test results must be submitted for all phases of the project, as per the Colorado Department of Transportation (CDOT) Schedule for minimum materials sampling, testing, and inspections found in the CDOT Materials Manual. E. If applicable, a letter of acceptance of maintenance and responsibility identifying all improvements are in place and in accordance with the approved plans submitted from the appropriate utility company, fire, water, and/or other special district, and/or municipality for any util ties and improvements shall be submitted with the request for release of collateral. F The wr tten request for release of Project Collateral shall be accompanied by Warranty Collateral in accordance with Section 8-2-70, Warranty Collateral, below. PAGE 8 2024-0065 ORD2023-16 G County staff shall schedule the request for consideration by the Board at a regularly scheduled public Board meeting and notify the applicant of the hearing date and time The Project Collateral shall be released after final written acceptance by the Board Sec. 8-2-70. Warranty Collateral. A Warranty Collateral shall be in an amount equal to fifteen percent (15%) of the value of the improvements as shown in the Improvements Agreement, excluding improvements fully accepted for maintenance by the responsible governmental entity, special district, or utility company B The warranty period shall be two (2) years from the date of the Board's consent to release the Project Collateral Sec. 8-2-80. Release of Warranty Collateral A Following the conclusion of the warranty period, the applicant shall submit a written request for release of the Warranty Collateral to Weld County B County staff shall inspect the improvements If the improvements need mitigation or repairs are required, said work must be completed prior to release of the Warranty Collateral In the event an applicant fails to adequately repair improvements associated with the Improvements Agreement, the County shall have the authority to pursue, at its sole discretion, Warranty Collateral to the extent necessary to complete the repairs in order to preserve public interest C If no improvements require mitigation or repairs, County staff shall schedule the request for consideration by the Board at a regularly scheduled public Board meeting and notify the applicant of the hearing date and time The Warranty Collateral shall be released after final written acceptance by the Board Sec. 8-2-90 Proportional Share Process for Improvements Agreements. A The proportional share process is an important tool used by the County to identify the shared cost of safety improvements for existing and new development to mitigate impacts to the county road system B Weld County uses the Equivalent Single Axle Load (ESAL) methodology when calculating an Improvements Agreement proportional share The ESAL methodology is a national standard for normalizing traffic counts to reflect the actual damage caused by large vehicles The purpose of the methodology is to create the most reasonable and fair method for analyzing traffic data and the impacts to county infrastructure C Weld County maintains a current list of approved and recorded Improvements Agreements Annually, the Improvements Agreement haul, or travel routes are evaluated to determine which roads will have proportional share costs for Weld County identified projects the next calendar year and therefore, what owners/land use permits will be affected so they can be notified in advance PAGE 9 2024-0065 ORD2023-16 Once the Improvements Agreement permit holders are identified, Development Review sends a courtesy letter notifying them of the anticipated proportional share associated with their use. This letter is meant to be general in nature and will not contain specific costs or percentages associated with the required contributions. It is meant to give permit holders preliminary notice that a project will be occurring in the upcoming calendar year. E On or before December 31 of the year prior to the Weld County identified projects, the permit holder will receive another letter giving the proportional share percentage with supporting documentation. An estimated cost will also be provided at this time. F Permit holder shall have the opportunity to review supporting documentation, review, comment and supplement the County's data, collection methodology and determinations. If the project is completed by the Public Works Department, the proportional share will be based on materials only. If the work is completed by a private contractor, the cost will be based on both materials and labor. G The final cost will be based on actual costs of the work performed and will be invoiced to the permit holder at the completion of the project. H The County's criteria for calculating the ESAL proportional share is identified in Appendix 8-Q. ARTICLE III - Culverts Add Sec. 8-3-10. Purpose. For the purpose of this Article, culverts may refer to, road culverts, driveway/access culverts, cross culverts, irrigation culverts, and similar structures that convey and maintain the natural flow of water carried in the roadside ditches. Amend Sec. 8-3-20. Installation of access culvert. A. The property owner shall pay the costs for materials for new road access culverts whenever the installation of a culvert is made necessary by the creation of a new access from pr vate property to a County road, by any alteration of the natural flow of water across private property by the owner, or for any other reason created by any owner of private property. The culvert shall be installed according to Appendix 8-Q of the Weld County Engineering and Construction Criteria as to size and location in the County rights -of -way or othe- County property in which such culverts may be installed. Consideration of culvert sizing shall be based on the existing upstream and downstream culvert diameter size. The culvert size will be determined in accordance with standard engineering practices by Public Works Operations at the time of culvert installation. The property owner shall be responsible for cleaning the borrow or roadside ditch to the extent required to accommodate the road access culvert and ensure proper drainage. B Property owner/user shall submit a Culvert Installation Form to Public Works for invoicing of the materials of the culvert installation. Property owner/user shall provide payment prior to culvert installation. The application form is available at Public Works. PAGE 10 2024-0065 ORD2023-16 Amend Sec 8-3-30. Maintenance After county acceptance of the culvert installation, Weld County shall be responsible for the maintenance and repair of the road access and/or any related culvert In the event of an emergency or if a hazardous situation is observed or detected, the property owner shall be notified and requested to provide an immediate remedy to the situation If the property owner fails to react, the County shall correct the hazardous situation and may bill the property owner for all incurred expenses Add Sec 8-3-40. Maintenance of irrigation structures The County's duty to maintain culverts, bridges or similar structures used for irrigation purposes shall be in accordance with the following statutory requirements A Section 43-5-305(1), C R S , which states as follows "Any person or corporation owning or constructing any ditch, race, drain, or flume in, upon, or across any highway shall keep the highway open for safe and convenient travel by constructing culverts, bridges, or similar structures over such ditch, race, drain, or flume When any ditch is constructed across, in, or upon any highway, the person owning or ' constructing such ditch shall construct a culvert, bridge, or similar structure long enough to conduct the water from shoulder to shoulder from such road or highway or of such greater length as the Board of County Commissioners having jurisdiction thereover may require, plans for the culvert, bridge, or similar structure having been approved in advance by the Board of County Commissioners The Board of County Commissioners shall maintain the culvert, bridge, or similar structure after construction, in accordance with the provisions of Section 37-84-106, C R S " B Section 37-84-106, C R S , which states as follows "All bridges constructed over any ditch, race, drain, or flume, crossing any public highway, street, or alley, after construction, shall be maintained by and at the expense of the county or municipality in which the ditch, race, drain, or flume may be situated " C In the event of an emergency or if a hazardous situation is observed or detected, the County shall notify the property owners/users to request the irrigation water be shut off in conjunction with property owners/users schedule, in order to perform emergency repairs If Public Works identifies this road as an essential travel or haul route, or inadequate detour route availability and the property owner/users fails to react, the County shall correct the hazardous situation and may bill the property owner/user for any incurred expenses Amend Sec. 8-3-50. County Authority. Remainder of Section — No change PAGE 11 2024-0065 ORD2023-16 ARTICLE IV - Use of Borrow or Roadside Ditches Add Sec. 8-4-10. Purpose. Borrow or roadside ditches are intended to intercept surface water from agricultural fields or residential property. Roadside ditches are not intended to accommodate forced point source discharges. Tailwater ditches are not recognized as part of Weld County's conveyance system. Amend Sec. 3-4-20. Responsibilities. Whenever possible, the county shall try to separate agricultural farming operations out of the county rcad right-of-way, especially when located in a municipal separate storm sewer systems (MS4) area. Persons in the County who are currently using borrow/roadside ditches along County rights -of -way for agriculture uses, whether the consent to such uses was originally given expressly or implied, must adhere to the following conditions: A. thru C. — No change. D. Tailwa:er shall be controlled to prevent erosion and sedimentation of the borrow ditches. Add Sec.8-4-30. Maintenance. A. Public works prioritizes and maintains Roadside Ditches on a case -by -case basis, as needed, to remove sediment, debris, trash, or other encumbrance that may be impeding the proper flow of water. Landowner's or tenant's may contact Public Works to request an inspection of a Roadside Ditch. Public Works personnel will inspect and schedule the Roadside Ditch to be cleaned, if deemed necessary. In the event drainage water overflows a Roadside Ditch, Public Works personnel will inspect the Roadside Ditch and determine if action, such as ditch cleaning, is required or if the event produced excessive runoff beyonc the capacity of the drainage system. B Roadside ditches are intended to carry stormwater from county roads to natural drainage basins. The amount of stormwater a roadside ditch carries varies. For planning purposes, Weld County never assumes a roadside ditch can carry more water than five (5) cubic feet per second (cfs). C Nonexclusive License Agreements (NELA's) for private irrigation structures located in county rights -of -way shall be done by separate Agreement on a case -by -case basis where the Board grants a nonexclusive license to access, construct, operate, and/or maintain privately owned equipment within county road right-of-way/property. Amend Sec. 8-4-40. Violations. If the Board of County Commissioners determines that users are violating the above - stated conditions, the Board may consider the revocation of its prior consent, whether express or implied. The revocation of consent may be entered by resolution of the Board of County Commissioners, following notice to the owner and user (if the user can be determined), and a hearing held pursuant to the procedures for adjudicatory type hearings. The Director of Public PAGE 12 2024-0065 ORD2023-16 Works shall have the burden of showing, by a preponderance of evidence, that the owner and user have failed to comply with Section 8-4-20 herein. ARTICLE V - Cattle Guards Amend Sec. 8-5-10. Purpose. Person includes any individual, business or corporation, who is not a landowner, must demonstrate authority to act on behalf of the landowner prior to coordination with the county on the installation of cattle guards. Cattle guards are intended to restrict the movements of livestock and are not intended to be used for drainage and utility purposes. Amend Sec. 8-5-20. New installations/Relocation. Any person in the County who wishes to install a cattle guard on any County road may do so only upon the following conditions: A. Property owner/User shall submit a Cattle Guard Installation/Relocation Form to Public Works for invoicing of the cost of the materials of the Cattle Guard installation/relocation. Property owner/User shall provide payment prior to Cattle Guard installation/relocation. The application form is available at Public Works. B The entire cost of installation or relocation of a cattle guard is paid by the person making the request, with the County doing the installation/relocation, or by requester with the County's written approval. Weld County will be responsible for maintenance and cleaning of Cattle Guards after installation is completed. C The Department of Public Works shall be notified prior to installation/relocation of a cattle guard. An invoice will be sent and payment received in accordance with the written agreement form attached in Appendix 8-C of this Chapter._ tihe Department of Public Works must receive the form at least thirty (30) days prior to the date of the installation/relocation. D The agreement between the Department of Public Works and the person making the request, detailing the rights and obligations concerning the cost of the Cattle Guard shall be signed by the person making the application. Maintenance and repair of the cattle guards shall be Weld County' responsibility. E Any cattle guard which is installed in County road rights -of -way must comply with any and all standards required by the Department of Public Works, including but not limited to, the County's Specifications for Cattle Guard Installation. Amend Sec. 8-5-30. Maintenance. A. Any person who benefits from any cattle guard located upon any maintained County road has the responsibility to periodically inspect for maintenance, proper function and inspect for cleaning. The person must notify Public Works within the same five (5) working days in which the person obtains the knowledge of the need for maintenance. PAGE 13 2024-0065 ORD2023-16 Cattle guard maintenance includes_ but is not limited to, the removal of all sand, dirt, silt and o:her solid debris which renders the cattle guard ineffective. The county deems a cattle guard _cleaned when the space within the cement box and below the grate of the cattle guard are free of debris. Catte Guard maintenance requests may be completed by the County within thirty (30) days of the request. B The maintenance of any cattle guard on any maintained County road shall be the responsibility of the County. C In the event a Cattle Guard is deemed, by the County, to be beyond maintenance or repair, the Ccunty shall replace the cattle guard at the county's expense. Delete Sec. 8-5-40. Reserved. Delete Sec. 8-5-50. Reserved. Delete Sec. 8-5-60._Reserved. Amend Sec. 8-5-740. Vested right. No portion of these policies shall be considered to have vested any person with the right to a particular size of cattle guard. The County, upon a determination that road improvement or widening is recessary, may require replacement of existing cattle guards. The county is responsible fo' Cattle Guard costs. ARTICLE VI - Miscellaneous Provisions Amend Sec. 8-6-10. Gravel pits. The Ccunty shall obtain all required state and federal permits for Public Works operations. A Gravel obtained from County permitted gravel sites shall not be sold or used for other than governmental purposes, except by specific authorization of the Board of County Commissioners. B The County will acquire, in its name, all gravel mining permits for gravel mining on County - owned property. When the property is not owned by the County, the issue of the obligation to obta°n, maintain and pay the costs of permits shall be addressed contractually. Delete Sec. 8-6-20. Reserved. Delete Sec. 8-6-30. Reserved. Delete Sec. 8-6-60. Reserved. PAGE 14 2024-0065 ORD2023-16 Amend Sec. 8-6-70 Satellite Facility use. Gravel Road operators may park personal vehicles in satellite facilities while performing road maintenance work for the County Any personal use of satellite facilities by County employees or any other individual except as specified above is prohibited Amend Sec. 8-6-80. Satellite Facilities utilities and rents When the County owns the satellite facility and a trailer pad, that item associated with the satellite facility will be provided at no cost Other than as specifically stated herein, utilities of gas and electricity shall not be provided to any grader operator in the County Each operator will be responsible for his or her own gas and electricity Amend Sec 8-6-100. Gravel road fugitive particulate emissions policy and procedure A General Growth throughout the County has led to increased vehicular traffic on all roadways under the County's jurisdiction;, as a result, a fugitive dust application may also be required for detour routes, or any other reason deemed appropriate by Public Works B Fugitive dust applications may be required if increased traffic on unpaved County roads has resulted in dissatisfaction with the levels of fugitive particulate emissions caused by vehicles traveling those roadways The County must also make reasonable efforts within budgetary constraints to comply with regulations established by the State Air Quality Control Commission regarding this issue In an effort to reasonably comply with air quality regulations, the policies and/or procedures set forth in this Section will be adhered to when considering requests for fugitive dust abatement C Responsibility for fugitive dust The County -maintained roadway segments with Annual Average Daily Traffic (AADT) volumes exceeding two hundred (200) vehicles per day should be treated to inhibit fugitive dust at the expense of the County subject to available budgetary appropriations The process for the determination of qualifying AADT volumes will be as outlined in Subsection D below Roadway segments with AADT volumes below two hundred (200) vehicles per day may also be treated for fugitive dust at the expense of property owners in accordance with Subsection F of this Section D Procedures for determination of traffic volumes in conjunction with fugitive dust issues 1 Routine counts Traffic counts will be taken as needed on gravel roadway segments in areas of the County which are determined by the County to have significant growth trends 2 — No change 3 Traffic count procedure If the AADT count exceeds two hundred (200) vehicles per day, the roadway segment will be recounted in ninety (90) calendar days using the methods noted above to confirm the original count If this count is significantly below the two hundred (200) vehicles per day AADT, the roadway may not be treated by the County for fugitive dust control When the County determines the PAGE 15 2024-0065 ORD2023-16 use of weekend or partial weekend counts could assist in establishing a representative average daily traffic count when factored with weekday counts, the seventy -two-hour count may include those time periods. D Determination of fugitive dust control mitigation. When a roadway segment meets the criteria for County mitigation, the County may, when practical and within budgetary constraints, select one (1) of the following alternatives to mitigate fugitive dust: 1. — No change. 2. Full depth treatment using dust control agents using no more than two (2) applications per year at the County's discretion. Recycled asphalt treatment up to eight -inches (8") and may also include a dust control agent, per Public Works discretion. 4 Asphalt or concrete paving, based upon qualification though the Capital Improvement Project prioritization process. 5. Speed limit reductions. Delete 5. Periodic watering. The mitigation alternative and time of implementation will be based on budget and seasonal constraints. The County will confirm the need for continued mitigation on roadway segments by conducting traffic counts using the procedures noted above and maintaining historical traffic count records. Should the AADT on a road segment fall below two hundred (200) vehicles per day, dust control mitigation may be discontinued by Public Works. E. Private application. The County has no objection to individuals applying dust control chemicals to County roads at their own expense, provided that they agree to the following conditions: 1. — No change. 2. Private application shall not include used oil applications. 3. Dust control chemicals must be applied in such a manner that will not contaminate any roadside ditches. Therefore, any materials which may wash from the roadbed will not be suitable. 4. — No change. 5. All dust control agents used on County roads shall be approved for use by the Department of Public Works. 6. — No change. PAGE 16 2024-0065 ORD2023-16 7 All private application must be applied by a Weld County approved vendor, who must obtain a county right-of-way use permit Amend Sec. 8-6-110. Survey monuments. A — No change B In order to ,avoid having surveyors dig holes in paved road intersections _to locate the monuments, the monument should be enclosed in a box which is kept at least one -quarter inch (1/4") below the roadway surface 1 thru 5 — No change C For gravel roads, the monument shall be located at least one (1) foot below the roadway surface D On concrete paved roadways the monuments shall be surface mount type CDOT class section 629, type 5 (Brass) and shall be recessed 1/2" below the surface Amend Sec. 8-6-130 Trees in rights -of -way. A — No change B It is the policy of the County that when trees on private property begin to obstruct visibility on County roads, the property owner shall be given notice to trim the trees within a reasonable time Remainder of section — No change Delete Sec. 8-6-140 Reserved. Sec 8-6-150. Road maintenance acceptance policy for public roads Persons desiring to obtain County maintenance of public roads shall first address such request to the Board of County Commissioners for its consideration at one (1) of its regularly - scheduled business meetings The person making the request shall be responsible to pay the entire cost of notification to owners and/or occupants of lands lying adjacent to the roadway Such notification shall include a description of the request and shall set forth the time and place of the Board consideration County maintenance of public roads may occur only if authorized by resolution of the Board of County Commissioners Before a public roadway be authorized by the Board for maintenance, the road must meet the following minimum conditions A and B — No change C The width of the road right-of-way shall not be less than sixty (60) feet D The road shall serve a minimum of five (5) legal lots, which must be developed with residential, commercial or industrial improvements to be considered for acceptance PAGE 17 2024-0065 ORD2023-16 Properties abutting the intersection of the road under consideration for acceptance and an existing publicly maintained road do not count toward the required five (5) lots. E Any new road width shall be a minimum of twenty-six (26) feet of graveled surface or meet the minimum design guidelines for the anticipated traffic on the roadway segment being consicered. F The following shall be the minimum acceptable standards before a road is accepted for maintenance: 1 — No change. 2. Borrow ditches shall be a minimum of twenty-four (24) inches deep with 4:1 side slopes and graded to provide adequate drainage on a case by case basis. 3 All driveway side road borrow ditches shall be sufficient to carry the five-year storm or be a minimum of a fifteen -inch -diameter culvert or culvert size based on the upstream and downstream culvert size as determined by the Director of Public Works. Crossroad drainage structures shall be sufficient to carry the ten-year storm or be a minimum of a fifteen -inch culvert as determined by the Director of Public Works. 4 The Department of Public Works shall test and inspect the roadbed subgrade for structural adequacy and acceptable materials, in accordance with the most current versions of the CDOT Field Materials Manual, reference CP 23, and the Standard Specifications Book SECTION 203 EXCAVATION AND EMBANKMENT. 5 A minimum of four (4) inches of compacted surface gravel in accordance with Table 9-12 of the Weld County Engineering hand Construction Criteria found in Appendix 8-Q. G There shall be no fences or other obstructions within county road right-of-way. If cattle have cross -access to the roadway, a cattle guard shall be installed in accordance with Article V above. H If a fence exists along the section line on which the road is to be built, relocation of the fence to the county road right-of-way lines shall be the responsibility of the sponsor(s) of the roadway project. Reimbffsement by the persons requesting authorization of County maintenance of public roads shall be made for acreage within the county road right-of-way included in an adjacent property Conservation Reserve Program (CRP) crop or which has an unharvested annual crop demolished by the roadway construction project. Remainder of section — No change. PAGE 18 2024-0065 ORD2023-16 Amend Sec. 8-6-170. Obstructions within county rights -of -way. The County reserves the right to maintain its road rights -of -way without obstructions located thereon Obstructions include, but are not limited to, fences, trash cans, gates, landscaping materials, irrigation structures, and any structure that does not meet the intent of being constructed with breakaway materials, regardless of whether or not they are physically located on the traveled portion Obstructions shall be removed from the County road rights -of - way upon request by the Department of Public Works The total expense of the removal of any obstruction from a County road right-of-way will be paid by the person who installed the obstruction, or by the person exercising ownership or control over the obstruction In' the event such person does not remove the obstruction as requested, the County will remove the obstruction and bill the person responsible for the obstruction for any expenses incurred in its removal This Section shall not alter any rights, responsibilities and/or penalties regarding the act of obstructing highways as set forth in Sections 18-9-107 and 43-5-301, C R S Delete Sec 8-6-180. Reserved Amend ARTICLE VII - Signs and Pavement Markings Sec 8-7-10 Purpose. The County's roads require certain pavement markings and signs per the Manual on Uniform Traffic Control Devices, and Colorado state statute The pavement markings and signs are to serve the public interest in traffic safety Sec. 8-7-20. Sign policy A The County sign shop shall produce signs for County -maintained roads in subdivisions, unincorporated areas and historic townsites, where the signs are produced pursuant to a separate intergovernmental agreement with a governmental agency, and for non -County - maintained roads upon request and payment of the cost of the (blue) signs by the persons making such requests B All signs placed in the County rights -of -way must conform to the Manual on Uniform Traffic Control, Devices (MUTCD) No signs, except those installed by the County, shall be located within County rights -of -way and all signs adjacent to rights -of -way must meet applicable building and zoning codes Sec. 8-7-30 Memorial signs. A The memorial sign must be requested by the victim's family or other sponsor with the consent of the victim's family through an application - Upon submittal of, a Roadside Memorial Sign Application with fee to the Department of Public Works, the County shall review application for acceptance The application form is available at Public Works 1 If accepted, the Department of Public Works shall construct, install, and maintain the requested roadside memorial sign for four (4) years after the date of installation After four (4) years, the sign shall be removed and held for a period PAGE 19 2024-0065 ORD2023-16 of thirty (30) days to provide the applicant the opportunity to pick up the removed sign for keeping _ Signs not claimed within the thirty (30) day period will be recycled 2 If the application is not accepted by the County, the fee shall be returned to the applicant No private installation or maintenance of roadside memorial signs is allowed B These memorial signs shall consist of two (2) sign panels measuring standard dimensions in accordance with the MUTCD 1 There are four (4) alternative messages for the top sign panel These messages correspond with the type of accident or situations that occurred during the accident The four (4) messages are a "Please Drive Safely" — this is the most common message used for these signs b "Please Ride Safely" — this message is for accidents involving motorcycles or bicycles c "Please Buckle Up" — this message is for accidents involving victims who were not wearing their safety restraints d "Don't Drink and Drive" — this message may only be used for fatal alcohol/drug (DUI) related accidents where there has been a conviction of the driver involved in the fatal crash who was in violation of Colorado DUI - laws,' or a 'toxicology report showing the victim driver to have been in violation of Colorado's DUI laws 2 The bottom sign panel will include the message "In Memory Of" and the victim's name as shown in the application The bottom sign panel can show multiple names if there were multiple victims in the accident and each of those victims' immediate family gives permission for the names to be added in the application C Memorial signs shall only be installed by the County on County -maintained rights -of -way The Department of Public Works shall install the sign, as close as possible to the location given in the application If that location conflicts with existing signs or creates an unsafe condition, the sign will be moved to where it can be installed safely If the roadway is annexed by a local municipality after installation, the applicant will be required to receive permission from that municipality for the sign to remain, otherwise, the County will remove the sign if requested by the annexing agency and return it to the applicant Removed signs shall be held for a period of 30 days to provide the applicant the opportunity to pick up the removed sign for keeping Signs not claimed within the thirty (30) day period will be recycled D The applicant shall submit a fee, as determined by the Board of County Commissioners, to help cover the sign's material cost, installation, maintenance, and removal by the PAGE 20 2024-0065 ORD2023-16 County In a multiple -fatality crash, the fee may be split equally between those families who want their family members' names on the sign Once removed, each separate family may receive a sign to keep if requested Removed signs shall be held for a period of 30 ,days to provide the applicant the opportunity to pick up the removed sign for keeping Signs not claimed ,within the thirty, (30) day period' will be recycled E This section is considered to be the County's permitting system for roadside memorial signs and is in lieu of'the procedural requirements of Section 43-2-149, C R S ARTICLE VIII - Transportation Planning Add Sec. 8-8-10 General. Transportation planning for Weld County is a continuing, cooperative, and comprehensive process that includes the development of planning documents, working with regional agencies, securing funding for transportation projects, and reviewing safety data Weld County collaborates with many different regional agencies in order to plan and implement needed improvements to the transportation system Planning of the roadway network with respect to functional classification, alignment, and intersection/access spacing is developed through transportation planning Weld' County will continue to build and maintain a safe and reliable transportation system through prudent transportation planning Add Sec 8-8-20. Purpose The purpose of this Article is to identify transportation planning policies, as well as the guiding technical documents for Weld County for the basis of formulating transportation planning related policies Amend Sec. 8-8-30. Weld County Transportation Plan and Functional Classification Map. A The Weld County Transportation Plan, as amended ("Transportation Plan"), is intended to summarize existing transportation conditions, recommend policy, funding and roadway development for the County over a twenty -five-year planning horizon The Transportation Plan will serve an integral part in the decision -making process for County staff and elected officials The Transportation Plan will also be an extension of the Comprehensive Plan focusing on basic travel characteristics unique to the County The Transportation Plan is found in Appendix 8-N of this Chapter and is intended to be used in concert with Chapter 22 of this Code It is recommended to update this plan when updating the Comprehensive Plan B The Functional Classification Map is a component of the Transportation Plan and is the process by which County roads are grouped into classes according to'the character of service provided Grouping the roads into classes identifies the required minimum width of future road right-of-way and locations for future road right-of-way reservation The Transportation Plan recommends the Functional Classification Map be reviewed every two to three years, and can be amended by the Board of County' Commissioners, as needed A link to the Functional Classification Map is found in Appendix 8-O of this Chapter PAGE 21 2024-0065 ORD2023-16 C The minimum road right-of-way widths are as follows, unless shown otherwise on the Functional Classification Map found in Appendix 8-O of this Chapter: 1. Arterial: 140 feet. Arterials may include planned roundabouts or other traffic features that necessitate expanded road right-of-way width as shown in arterial studies adopted by the Board of County Commissioners by resolution. 2 Collector: 80 feet. 3 Local: 60 feet. All roads maintained by Weld County have a minimum of 60 feet of road right-of-way. 4 Minimum road right-of-way widths for "Arterials Not Constructed" shown on the Functional Classification Map are found in project identifications and/or designs approved by resolutions of the Board of County Commissioners by resolution. 5 Minimum road right-of-way widths for Weld County four -lane controlled -access highways detailed in C.R.S. Section 43-2-110 are identified in approval documents. D Where road right-of-way has not been dedicated or otherwise acquired by the County, but the County maintains a public road, the width of the prescriptive road right-of-way, which includes the entire area necessary for maintenance by the County, shall be a minimum of 60 feet (30 feet from either side of the center of the road). E Weld County identifies primary and secondary roadway classifications, as required by C.R.S §43-2-101. Each year, the Weld County Department of Public Works submits a map to CDOT showing the Weld County Primary and Secondary Road System and the total miles of public roads maintained by Weld County and eligible for participation in the HUTF pursuant to the requirements of C.R.S. §43-2-110(1). Delete Sec. 8-8-40. Reserved. ARTICLE IX - Municipal Separate Storm Sewer System Amend Sec. 8-9-50. Definitions. For the purpose of this Article, the following terms, phrases, words and their derivations shall have the meanings given herein: Construction dewatering permit means the Colorado Discharge Permitting System (CDPS) General Permit C00080000, Construction Dewatering Discharges, which is regulated by the Colorado Department of Public Health and Environment, Water Quality Control Division. Add Development area means the area of land disturbance, including past and future phasing. When multiple lots are involved, such as a subdivision of land, the potential cumulative land disturbance will be considered the development area for the purposes of drainage design. PAGE 22 2024-0065 ORD2023-16 Stormwater means any surface flow, runoff and drainage occurring, during or following any form of natural precipitation event and resulting therefrom and consisting entirely of water from natural precipitation events including snowmelt Remainder of section — No change , Amend Sec. 8-9-80 Pre -construction. A — No change B Pre -construction requirements The following documents are required to be submitted and accepted by the Department of Public Works prior to any land -disturbing activity that will disturb greater than or equal to one acre of land Applicable land -disturbing activity includes the total disturbed area, either planned or potential, from a common plan of development or sale The Department of Public Works shall determine applicable sites and required documentation necessary to comply with MS4 Permit requirements 1 thru 4 b — No change c Drainage report, identifying the following components site drainage, design details for permanent control measures, narratives for non- structural control measures, if ,applicable, and corresponding calculations used, in determining compliance with the "Base Design Standards" of the MS4 permit "Base Design Standards" are detailed in the Weld County Engineering and Construction,Cntena Manual (Appendix 8-Q, Sec 6 2 6 2- Permanent Water Quality Control Measure Design) d thru f — No change C Enforcement Failure to comply with this Section is a violation of this Article and enforcement procedures shall be pursued as detailed in Section 8-9-130 Additionally, a `hold' may be placed on the applicable parcel(s), which prevents future permitting of the site until requirements are met Amend Sec. 8-9-90. Construction activity A thru B 2 b — No change Delete c Indicator inspection c Inactive site inspection An inactive site inspection is conducted at least every ninety (90) days Inactive site inspections are reserved for sites pending final stabilization, and all construction activity has been completed PAGE 23 2024-0065 ORD2023-16 Detailed inspection procedures can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec 6 2 5 1' — Stormwater Inspections) C — No change D Enforcement Failure to comply with this Section is a violation of this Article and enforcement procedures shall be pursued as detailed in Section 8-9-130 Additionally, a 'hold' may be placed on the applicable parcel(s), which prevents future permitting of the site until requirements are met Amend Sec 8-9-100. Post -construction A Purpose The purpose of this Section is to require the implementation and maintenance of permanent control measures to ensure post -construction requirements of the MS4 permit are met All control measures shall be selected, installed, implemented and maintained in accordance with good engineering, hydrologic and pollution control practices This Section applies to all land -disturbing activities commencing after July 1, 2019 B i Post -construction requirements The following requirements are applicable to sites for which construction activity will create a disturbed area greater than or equal to one acre and sites which will have a cumulative disturbed area greater than or equal to one acre during future phasing The requirements are applicable to individual sites as well as sites that are part of a larger common plan of development or sale For subdivisions, the potential development area will be considered unless otherwise platted The Department of Public Works shall determine applicable sites and required procedures and documentation necessary to comply with MS4 permit requirements 1 Permanent control measures a — No` change b "Base design standards" can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec 6 2 6 2 - Permanent Water Quality Control Measure Design) c — No change 2 As -built submittal a After construction of drainage is complete, a certified as -built drawing, signed and stamped by a Professional Surveyor and licensed Professional Engineer in the State of Colorado, shall be submitted to the Department of Public Works 3 Final inspection and acceptance PAGE 24 2024-0065 ORD2023-16 a After, receiving the as -built, the County shall inspect the site to verify compliance with the Drainage Report, Drainage and Access Easements, Long -Term Operation and Maintenance Plan, and other submitted documentation If the Department of Public Works determines the site has met the requirements of this Section, the site will be allowed to obtain a Certificate of Occupancy (CO) Otherwise, the parcel will remain on hold until all requirements have been met 4 Post -acceptance oversight a Inspections of permanent control measures Inspections shall be conducted at least every five (5) years, or an alternative frequency determined by the Department of Public Works, to ensure adequate long- term operation and maintenance of permanent control measures The County Inspector shall verify the permanent control measure with the as -built and long-term operation and maintenance plan If the inspector is unable to visually verify adequate functioning and maintenance of the permanent control measure, additional requirements may apply Additional requirements may be avoided by installing structural components, such as a concrete trickle channel,_ which allows visual verification of adequate functioning and maintenance 4 b thru 5 — No change C Exemptions 1 — No change 2 A list of allowable exemptions under the MS4 permit can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q, Sec 6 2 6 1 — Exemptions) The most common exemptions are as follows a Large -Lot Single -Family Sites A single-family residential lot, or agricultural zoned lands, greater than or equal to 2 5 acres in size per dwelling and having a total lot impervious area of less than 10 percent A total lot imperviousness greater than 10 percent may be allowed when a study specific to the watershed demonstrates the expected soil and vegetation conditions are suitable for infiltration/filtration of the WQCV for the site The maximum total lot impervious covered under this exclusion shall be 20 percent b Undeveloped Land Sites with land disturbance to undeveloped land (land with no human -made structures such as buildings or pavement) that will remain undeveloped c Above Ground and Underground Utilities Activities for installation or maintenance of underground utilities or infrastructure that does not permanently alter the terrain, ground cover, or drainage patterns from those PAGE 25 2024-0065 ORD2023-16 present prior to the construction activity. This exclusion includes, but is not limited to, activities to install, replace, or maintain utilities under roadways or other paved areas that return the surface to the same condition. D Enforcement. 1. Failure to comply with this Section is a violation of this Article and enforcement procedures shall be pursued as detailed in Section 8-9-130. Additionally, noncompliance may result in an `MS4 hold' and may be placed on the applicable parcel(s), which prevents future permitting of the site until the parcel(s) requirements are met. Amend Sec. 3-9-130. Enforcement procedures. A. — No change. B. Informal notice of violation. Except where a threatened discharge exists and/or emergency suspension is necessary, the Department of Public Works shall attempt to provide an initial informal notice to a person violating this Article. Such notice shall specify the location, type and severity of the violation and request that such person take immediate action to address the violation. Notices of violation are followed by compliance inspections to ensure the violation has been resolved. Failure to correct the violation within the specified time nay result in a formal notice of violation. In the event reasonable efforts to communicate the informal notice to such person are unsuccessful, a formal notice of the violation shall be issued by the Department of Public Works. Causes for informal notices of violation include, but are not limited to: 1 Minor issues of improper handling, storage or disposal of potential stormwater pollutants; 2. and 3. — No change. C Forma notice of violation. If the violation for which informal notice was given has not been resolved within fourteen (14) days of such notice, and no plan for corrective action has been communicated, and except where emergency suspension is necessary, the Department of Public Works shall provide a formal notice of violation to persons violating this Article. Formal notices of violation are also issued for recurring violations and/or violaticns more severe in nature. Notices of violations are followed by compliance inspections to ensure the violation has been resolved. Recurring violations may result in fees being assessed in accordance with Section 8-9-140 and/or enforcement methods being pursued in accordance with Section 8-9-150. Causes for formal notices of violation include, but are not limited to: 1. thru 9. — No change. Such notice shall describe the nature of the violation and may require without limitation: PAGE 26 2024-0065 ORD2023-16 1 thru 4 — No change If abatement of a violation and/or restoration of affected property are required, the notice shall set forth a reasonable deadline within which such remediation and/or restoration must be completed The written notice of violation shall be served by email or hand delivery or by certified mail, return receipt requested Remainder of section — No change ARTICLE XI - Storm Drainage Criteria Division 1- General Provisions Amend Sec. 8-11-10 Intent: A The intent of the chapter is to provide minimum standards to preserve and protect the public health, safety and general welfare in the unincorporated lands of the County, pursuant to authority granted by Part 4 of Article 15 of Title 30, and Article 35 of Title 30,, CRS , Remainder of section — No change Amend Sec. 8-11-20. Definitions. For the purpose of this article, the following terms, phrases, and words and their derivations shall have the meanings given herein Retention pond/Stormwater Infiltration facility A flood control feature designed to temporarily store stormwater runoff and reduce peak flows Retention ponds return water to the watershed through infiltration into the ground Remainder of section — No change Amend Sec. 8-11-30 Adoption of storm drainage standards. A The Mile High Flood District's "Urban Storm Drainage Criteria Manual," (MHFD Manual) consisting of Volume 1, Volume 2, and Volume 3, as currently published or hereafter amended, is hereby adopted by reference, with the amendments and additions which are' set forth herein All references to "District" or "The District" within the MHFD Manual shall be replaced with "Weld County" All facilities for stormwater management on properties located within the unincorporated lands of the County, whether public or private, shall be designed and constructed in accordance with such criteria, unless a master drainage plan ' specific to the area of the site has been approved by the County B The criteria and procedures contained in this article are intended to supplement the MHFD Manual in ways specific to Weld County In the case of a conflict between the MHFD Manual and the supplemental criteria and procedures in this article, such supplemental criteria and procedures shall take precedence over the MHFD Manual PAGE 27 2024-0065 ORD2023-16 C Further guidance for stormwater design and construction shall be in accordance with Chapter 5 of the Weld County Engineering and Construction Criteria. Amend Sec. 8-11-40. Drainage policy. A. — No chance. B. For new development; un-detained discharges to roadside ditches located in the County road right-of-way are prohibited. C. and D. — No change. E. Weld County shall review and approve new development in accordance with the storm drainage criteria of this article. F. — No change. G. Irrigation ditches shall not be used as outfall points for stormwater runoff from Uses by Special Review, Site Plan Reviews, Subdivisions, Planned Unit Developments, or WOGLAs unless such use is approved, in writing, by the ditch owner(s). Water quality treatment may be required. H. An as -built survey of stormwater facilities shall be provided if requested by Weld County. Add Sec. 8-11-45. Exceptions. A. Exception criteria. Exceptions to stormwater detention shall not jeopardize the public health safety, and welfare of public and private property. No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. Weld County will confirm if the development qualifies for an exception based upon the information provided by the applicant. Exception requests shall be supported with an approved drainage narrative, which must describe the following minimum criteria: 1. The exception being requested for consideration. 2. Any existing and proposed improvements to the property. 3. thru 8. — No change. B Exceptions. Uses that can be excepted from stormwater detention are limited to the following: 1. thru 5. — No change. Gravel pits if the stormwater drains into the gravel pit. Releases from the site shall comply with the Weld County Engineering and Construction Criteria, including dewatering. Topographical information shall be provided. PAGE 28 2024-0065 ORD2023-16 7 Residential developments with no historic flooding where all the following conditions exist This exception shall be supported by calculations provided by the Applicant Additional information may be requested and will be signed and stamped by a Colorado Licensed Professional Engineer a Nine (9) lots or fewer b The minimum lot size is equal to, or greater than, three (3) acres per lot Delete c Downstream roadway criteria are not exceeded c The total post -development imperviousness, for the rural residential development does not exceed ten percent (10%), assuming that all internal roads and driveways are paved 8 Development of sites where the change of use does not increase the imperviousness of the site Note This exception cannot be applied to sites where impervious surfaces were added for, or in conjunction with, a business that is/was operating in violation and/or without the required Weld County land use permit 9 A parcel of land or project site where the "total developed stormwater runoff' from the 100 -year, 1 -hour storm is less than, or equal to, five, (5) cfs The "total developed stormwater runoff' includes cumulative runoff from the proposed project site plus runoff from any previously developed project site on the subject parcel A project site is the area of land that lies within the project's limits of disturbance during construction This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer 10 In -fill development parcels with total area less than, or equal to, one (1 0) gross acre 11 An individual parcel with an unobstructed flow path and no other parcel(s) between the channel within a Federal Emergency Management Administration (FEMA) regulatory floodplain and the project 12 A parcel greater than one (1) gross acre and less than, or equal to, five (5) gross acres in size is allowed a onetime exception for a new four thousand (4,000) sq ft of 100% impervious area or equivalent imperviousness (See Appendix 8-Q in the Weld County Engineering and Construction Criteria Manual for impervious value percentages) 13 A parcel greater than five (5) gross acres in size is allowed a onetime exception for a new nine thousand (9,000) sq ft of 100% impervious area or equivalent imperviousness (See Appendix 8-Q in the Weld County Engineering and Construction Criteria Manual for impervious value percentages) 14 No change PAGE 29 2024-0065 ORD2023-16 Amend Sec. 8-11-50. Rainfall. The designer shall use the most appropriate and best available data for the project area in determining the rainfall quantities. The applicant shall utilize local rainfall data from the National Oceanic and Atmospheric Administration (NOAH) unless otherwise approved by Weld County. The use of synthetic rainfall distribution data is not permitted. Amend Sec. 8-11-60. Runoff. A. The Rational Method should not be used to determine runoff for basins larger than one hundred sixty (160) acres. In areas located in the southwest portion of Weld County, where areas are larger than one hundred sixty (160) acres SWMM is required. Delete B. Amend Sec. 8-11-70. Street drainage for use by special review, commercial, industrial, planned unit development and residential subdivisions. A. — No chance. B. Inlets. 1. The design guidelines provided in the streets/inlets/storm sewers chapter of the MHFD Manual (Volume 1) should be used when designing stormwater inlets. The standard inlets permitted for use in Weld County streets/roads are shown in the following table: Remainder of 1. and 2. (including both tables) — No change. C. Pipes. 1. The design guidelines provided in the streets/inlets/storm sewers chapter of the MHFD Manual (Volume 1) should be used when designing stormwater pipes. Remainder of section — No change. Amend Sec. 8-11-80. Major drainage. A. — No chance. B. Open Channel Design Principles. 1. Grass -lined open channels conveying less than fifty (50) cfs may reduce the minimum 1.0 -foot freeboard requirement to the freeboard required to convey 1.33 times the 100 -year design flow. The reduced freeboard may only occur if a 1.0 - foot minimum freeboard is not physically possible, and calculations are submitted and accepted by Weld County. PAGE 30 2024-0065 ORD2023-16 2 Generally, channels and swales should be no steeper than 4 1 If steeper slopes are required due to site constraints, the design engineer shall address how the channel will be maintained Amend Sec 8-11-90 Culverts in County road right-of-way A Sizing 1 The applicant shall contact Weld County to determine which types of storm sewer pipes are permissible for use in County road rights -of -way or public drainage easements 2 — No change B Materials Culverts that are to be installed in a County road right-of-way that is routinely burned must be made of either concrete or metal Pipes made of flammable materials (such as PVC or HDPE) will not be allowed in County road rights -of -way that are subject to weed burning Amend Sec. 8-11-100 Storage. A Detention Criteria 1 and 2 — No change 3 Off -site flows can be routed over the spillway or routed around the site Delete a Delete b 4 The elevation of the top of the detention pond embankment, except at the spillway, must be a minimum of 1 -foot of freeboard above the 100 -year water surface elevation in the detention pond 5 Outlet structures should be sized and structurally designed to release at no more than the 1 -hour, 5 -year historic release rate in urbanizing drainage areas and 1 -hour, 10 -year historic release rate in non -urbanizing drainage areas without structural or hydraulic failure Historic is defined as an undeveloped site with a 2 0% imperviousness The outlet pipe must contain a minimum of two concrete cutoff walls embedded a minimum of eighteen (18) inches into undisturbed earthen soil The cutoff walls must be a minimum of eight (8) inches thick The outlet pipe bedding material must consist of native earthen soil, not granular bedding material, to at least the first downstream manhole or daylight point 6 — No change PAGE 31 2024-0065 ORD2023-16 7 A concrete cutoff wall eight (8) inches thick, three (3) feet deep, and extending a minimum of five (5) feet into the embankment on each side of the emergency spillway opening, is required on all privately -maintained detention ponds and regional detention ponds. The concrete cutoff wall permanently defines the emergency spillway opening. The emergency spillway elevation must be tied back into the top of the embankment using a maximum slope of 4:1. 8. and 9. — No change. B Retention Criteria. 1. thru 3. — No change. 4. The design of the retention facility must provide evidence that the pond will drain in accordance with C.R.S. 37-92-602(8), as amended, when only draining through the bottom of the pond (side slopes cannot be used in the calculation). A retention pond that can cause injury to water rights or is in violation of state or federal law will not be accepted. Erosion Protection Design Criteria. Erosion protection for storage facilities must be designed to prevent erosion and ensure that the sediment does not leave the site or impact downstream properties. It will be necessary to leave erosion control measures in place u ntil one season of growth and the site reaches final stabilization (70% vegetative cover). The Control Measures/BMPs outlined in the MHFD Manual (Volume 3) should be used. Amend Sec. 8-11-110. Revegetation. A. Weld County utilizes the information provided in the Revegetation Chapter of the MHFD Manuel (Volume 2), and the Best Management Practices Chapter of the MHFD Manual (Volume 3). Weld County has highly recommended seed mixes that are applicable to specific areas of the County. These seed mixes can be found in the Weed Management Sect on of the Weld County Public Works Website. Noxious weeds shall be controlled on site, pursuant to Chapter 15, Articles I and II, of the Weld County Code. B. Seedirg and Planting. In addition to the site preparation guidelines outlined in the revegetation chapter of the MHFD Manual (Volume 2), if mulching with straw, the straw must be free of seeds and weeds. Amend Sec. 8-11-120. Stormwater quality. A. A water quality feature improves the quality of stormwater runoff resulting from the impacts of site development. A water quality feature can be an existing low spot on a property that n atura ly collects water, or it can be an area on a property that has been excavated to capture stormwater runoff. The required water quality capture volume of a feature is based o n the site's size and imperviousness. A properly sized feature will capture and hold stormwater runoff for the period of time necessary for contaminants to settle out before stormwater runoff is allowed to exit the site. PAGE 32 2024-0065 ORD2023-16 B An accepted methodology for a water quality feature design can be found in the MHFD, Manual, Volume 3, Best Management Practices Remainder of section — No change - Amend Sec. 8-11-130. Control measures. Weld County uses the Control Measures/BMPs that are outlined in the MHFD Manual (Volume 3) Best Management Practices , Amend Sec. 8-11-140. Maintenance A 'Culverts located outside of County -maintained road rights -of -way are not maintained by Weld County The owners of those culverts are responsible for their maintenance Culverts that are part of a subdivision drainage plan are maintained by the respective homeowner's association Those, culverts should be maintained and cleaned out annually, per the drainage report maintenance plan, or on an as -needed basis to, ensure proper drainage of the subdivision B thru D '— No change E Areas designated for stormwater storage,' retention, or detention are not to be used for storage of materials, building, or parking, or modified without approval from Weld County Amend Sec. 8-11-160 Stormwater drainage criteria variances. The ,variance procedure is intended to address cases of hardship Relief from the provisions of this article may not be granted when the hardship is brought about solely through the actions of the appellant No relief may be granted when the result of granting the requested relief is detrimental to the public health, safety, and general welfare or when the relief is contrary to the purpose and intent of this article In granting any variance, Weld County may prescribe appropriate conditions and safeguards in conformity with this article Violation of such conditions and safeguards, when made a part of the terms under which the variance is granted, shall be deemed a violation of this article The variance request shall be stamped and signed by a professional civil engineer licensed to practice in the State of Colorado Requests will be reviewed by the proper Weld County designee In order to be granted, the variance request must meet the criteria' as specified in Chapter 12 of the Weld County Engineering and Construction Criteria (Appendix 8-Q of the Weld County Code), Delete A thru E Remainder_ of section —'No change PAGE 33 2024-0065 ORD2023-16 ARTICLE XII - Grading Permit Policy Amend Sec. 3-12-10. General. The Grading Permit is a tool to ensure that the County has reviewed proposed grading plans and erosion and sediment control practices for planned construction activities with the goal of avoiding pctential damages and risks to the public. A Grading Permit grants the Permit Holder permission to conduct construction activities within the requirements of applicable state regulations ar d provides the County with sufficient oversight to minimize the potential for offsite damages. In addition, construction activities in the County must be compliant with applicable state regulations regarding releases of sediment and water from construction sites. This policy shall apply within a I unincorporated areas of the County as of the effective date of this Article. Amend Sec. 3-12-20. Purpose. This Article recognizes the importance of protecting the health, safety and welfare of the public, safeguarding County infrastructure, and the protection of water quality and private property rights. This Article describes the minimum requirements for prevention of detrimental or negative impacts to Cc unty water quality and damages to private property and County infrastructure by construction activities within the County. The goals are: A. thru C. — NJ change. Add D. To identify and eliminate any preventable damages to County infrastructure caused by constr action activities. Add E. To ensure compliance with all Federal, State, and County laws and regulations pertaining to grading and water quality. Amend Sec. 3-12-30. Grading Permit. A. Issuance of Grading Permit. A Grading Permit shall be issued only in compliance with the rules End regulations set forth in this Article. In no event shall construction be allowed or permitTed if it is detrimental to the public health, welfare and safety or the grading and/or sediment and erosion control plans indicate that the construction activities will be out of compliance with Federal or State laws and regulations. B. - No change. C. No Work Without Permit. No person or entity may surface disturb, grade, construct or excavate over one (1) acre of nonexempted ground without first having obtained a Grading Permit from Weld County. In addition, no person or entity may grade, excavate, construct or lease disturbed and unstabilized over one (1) acre of nonexempted ground beyond the date or dates specified in the Permit unless: (1) the person or entity requests a written extension before the expiration of the initial Permit; and (2) a new Permit or extension is granted. It is a violation of this article to perform this work without a permit. PAGE 34 2024-0065 ORD2023-16 D Exemptions The following land disturbance activities are permissible without obtaining a Grading Permit, unless otherwise located within a designated Municipal Separate Storm Sewer Systems (MS4) area The Department shall determine if the exemption is in accordance with the County's MS4 permit Other permits, such as right-of-way, flood hazard or OWTS, may still be required 1 thru 4 — No change 5 County capital improvement or County maintenance projects within a road right- of-way and temporary construction easements (TCE) 6 — No change 7 Maintenance and resurfacing of existing streets/roads, parking/outdoor storage areas, runways, and sidewalks/trail systems 8 Performance of emergency work necessary to prevent or mitigate, an immediate threat to life or property when an urgent necessity arises The person performing such emergency work shall promptly notify Weld -County of the problem and work required Any person performing such emergency work shall immediately notify Weld County of the situation and the actions taken The Weld County Public Works and/or Planning Services Director may, however, require such person to obtain a Grading Permit to implement remedial measures to minimize erosion resulting from the emergency 9 and 10 — No change 11 Land disturbance associated with the construction of natural surface trails may be exempted by Weld County except within designated MS4 areas, provided that the procedure outlined in this Article is completed prior to commencement of any trail construction If exempted, the land disturbance associated with the construction of natural surface trails shall generally conform with the performance standards of this Article Amend Sec 8-12-40. Definitions For the purpose of this Article, the following terms, phrases, words and their derivations shall have the meanings given herein Add Construction dewatenng permit means the Colorado Discharge Permitting System (CDPS) General Permit COG080000, Construction Dewatenng Discharges, which is regulated by the Colorado Department of Public Health and Environment, Water Quality Control Division Add Construction stormwater permit means the Colorado Discharge Permitting System (CDPS) General Permit COR400000, Stormwater Discharges Associated with Construction Activity, which is regulated by the Colorado Department of Public Health and Environment, Water Quality Control Division i PAGE 35 2024-0065 ORD2023-16 Right-of-way (ROW): means a strip of land that is dedicated or granted to and accepted by; Weld CouontyCounty for transportation purposes, such as a roadway or highway, whether maintained or non -maintained by Weld County. The term is used as both singular and plural. Add Stormwater construction permit: is the state -issued permit for construction activity disturbing one (1) acre or more, including disturbance less than one (1) acre but is part of a larger common plan of development or sale. Amend Sec. 8-12-50. Grading Permit application. A. Comp ete Application Required. Applicants shall file a complete application for a Grading Permit. Based upon the information provided in the application, additional submittals may be required by Weld County if sufficient information was not provided for review of the application. An application shall be considered complete if it is submitted in the required form, includes all mandatory information, including all supporting materials specified by application, and is accompanied by the applicable fee. If an application is determined to be incomplete, Weld County shall provide notice to the applicant, along with an explanation of the application's deficiencies. No further processing of the application shall occur until the deficiencies are corrected in a future resubmittal. An application which is determined to be incomplete may, or may not, retain its same processing cycle. B. A complete application will typically include civil engineering drawings signed and sealed by a registered Civil Engineer in the State. The drawings shall include a grading plan (with existing and proposed contours, spot elevations, and earth balance when requested), and a drairage plan. In addition, a Sediment and Erosion Control Plan that shows the location and types of control measures to be utilized at the site shall be provided. Typical control measure installation details and maintenance notes should also be on the drawings. C. — No change. Amend Sec. 8-12-60. Application review, Grading Permit issuance, permit expiration and permit extension. A. Review Process. The application and other data filed by an applicant for a Grading Permit shall be reviewed by Weld County. The application may also be reviewed by other departments or agencies to verify compliance with any applicable laws. If Weld County finds that the work described in an application for a Grading Permit conforms to the requirements and regulations set forth in this Article and meets the requirements defined in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q) or other pertinent laws regulations or ordinances, and that all required fees have been paid, a Gradirg Permit shall be issued to the applicant. Criteria upon which the Grading Permit shall be considered include, but are not limited to, the following: 1. thou 3. — No change. Changes in a Weld County Grading Permit. AWeld County Grading Permit shall not be charged, modified or altered without written authorization from the County. All work shall be done in conformance with the Permit issued. PAGE 36 2024-0065 ORD2023-16 C. Permit Limitations. A { Weld County Grading Permit requires the Permit Holder to meet certain permit specifications and general engineering standards. Weld County shall be responsible for ensuring compliance with such specifications and standards. The issuing and granting of the Grading Permit shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of this Article or of any Federal, State or County regulations. Additionally, the issuance of the Grading Permit shall not be construed as the approval or issuance of any necessary permits referred to in this Code. D Indemnification. Every Weld County Grading Permit issued shall include the following language: "Permit Holder, its agents, employees, subcontractors, contractors and assigns hereby agree to hold Weld County, Colorado, the agencies thereof and their officers and employees harmless from any and all loss and damage or any claims which may arise out of, or be connected with, the construction within the area covered by this permit; excluding any such loss and damage or any claims (including consequential damages) which may be caused solely by the negligence of Weld County, the agencies thereof or its officers and employees." E. — No change. Permit Expiration. Every Weld County Grading Permit shall expire one (1) year from the issuance of the permit. If the permit has expired, the Grading Permit must be reissued by the County before work can begin or be resumed. Prior to the expiration or closure of the Grading Permit, the disturbance shall be stabilized, and non -permanent control measures shall be removed. G Permit Extension. Any Permit Holder with an unexpired Grading Permit may apply, in writing, for an extension of the time within which work may begin under that Grading Permit if the Permit Holder is unable to begin or complete work within the time required for good cause, and that the cause is acceptable to Weld County. There may be an extension fee assessed to cover administrative costs. Amend Sec. 8-12-80. Permit Holder's general responsibilities. A Permit Holder is responsible for the following items. Additional requirements and more detailed information are shown in the Special Provisions of the Grading Permit. A. Control Measures. The Permit Holder shall ensure that all erosion and sediment control measures shown on the accepted plans are correctly installed and maintained. B Other Permits. The Permit Holder shall secure all permits required by federal, state and local agencies. Permit Holder may need to provide additional documentation in order Written documentation from an outside agency for the County to make a determination if a grading permit is required. permit shall be provided to the County when requested. C. — No change. PAGE 37 2024-0065 ORD2023-16 D Surety If deemed necessary by Weld County, the Permit Holder shall provide a surety bond e nd/or other security for the total amount required to stabilize, restore or reclaim the disturbed ground to prevent erosion and/or release of sediment, excessive storm water and/or pumped water discharges to surface waters from the construction area. Said security shall remain in effect for a period of twenty-four (24) months after all completion of construction and establishment of erosional stability. The amount of the security shall be suficient to stabilize a disturbed site to prevent releases of sediment and water from construction sites and protect the health, safety and welfare of the public. The amount shall b3 based on cost estimates of site restoration provided by the applicant and accepted by the County. Whether or not covered by surety, the Permit Holder shall reimburse the County for any and all expenses incurred by the County within twenty-four (24) months after completion of any work as a result of, or related to, failure by the Permit Holder to perform all installation, construction, maintenance or other work pursuant to the Grading Permit in a workmanlike manner. E — No chance. F Traffic Control. Construction activities impacting the County rights -of -way shall not interfe .e with movement of traffic or compromise public safety. A County Right -of -Way Use Permit may be required in addition to a Grading Permit. G Emergency Conditions. When a condition arises where emergency work must be performed, ed, the applicant shall immediately notify the County of the emergency event, type and extent of work. Within two (2) business days after the occurrence of the emergency, the ap Dlicant shall apply for the necessary permits, pay the associated fees and fulfill the rest of the requirements necessary to comply with the Grading Permit for the actions the applicant took in response to the emergency. H — No chance. Site Stabilization, Restoration and Cleanup. The Permit Holder shall assume all resporsibility for stabilizing the permitted site to prevent erosion and discharges of sediment. The Permit Holder shall also assume all responsibility for removing all debris associated with the construction activities in the County rights -of -way and all non- perrnalent control measures. If, upon inspection, the County determines that there is risk of erosional damage, or sediment discharges or debris has not been removed from the County rights -of -way, the County shall notify the Permit Holder of the violation of the Grading Permit conditions. The Permit Holder, upon notification from the County, shall correc. all work to the extent necessary. The work shall be completed within the time pericd specified in the notice from the County. If the Permit Holder fails to establish site stability or restore the rights -of -way in the manner and to the condition required, the County may perform the restorations. In that event, the Permit Holder shall pay to the County, within thirty (30) days of billing, the cost of restoring the County rights -of -way. Remainder of section — No change. PAGE 38 2024-0065 ORD2023-16 Amend Sec. 8-12-90. Inspections. A. Inspections during the construction period may be made by the County to ensure that work is progressing in compliance with the Grading Permit. It shall be the responsibility of the Permit Holder to provide safe access to the work site for the County and to all others, as authorized by law, for inspection at all reasonable times during the execution and upon completion of the work. At the time of inspection, the County may order the immediate termination of any work which involves the unauthorized exportation of material, or which poses, or is causing, a serious threat to the life, health, safety or well-being of the public. B. It shall be the responsibility of the Permit Holder to notify the County when work is ready for inspection. Weld County requires that every request for inspection be received at least forty-eight (48) hours before such inspection. Such requests may be made by telephoning. or emailing the Department of Planning Services. The presence of County employees on -site shall not guarantee or qualify the Permit Holder's performance. The Weld County Grading Permit must be available on -site for review by County staff. Failure to comply may result in suspension of the Grading Permit. C To ensure compliance with this Article, the County may make, or require, inspections and/or testing of any work as deemed necessary. _Work performed without the --required inspections shall be subject to removal and replacement at the Permit Holder's expense, regardless of the quality of the work. Any inspection hours required outside of the normal working hours will be paid for by the Permit Holder. Certain types of work may require continuous inspection. When such projects exceed the County's ability to provide ample inspection, the Permit Holder will incur the cost for providing a private inspection firm to conduct inspectons as needed. This third -party inspector will be appointed by the County prior to issuance of the Grading Permit. Amend Sec. 8-12-110. Appeal of denial of Grading Permit. If an application for a Grading Permit is denied by the County, or if the applicant objects to any of the terms or conditions of a permit thereby placed by the County, the applicant has the right to appeal the decision to the Board of County Commissioners, in writing, utilizing the appeal procedures set forth in Section 2-4-10 of this Code. Amend Sec. 8-12-120. Failure to comply with terms of grading permit. A. The issuance of the Grading Permit based on plans, specifications or other data shall not prevent the County from requiring the correction of errors in the plans, specifications and other data, or from stopping excavation or construction operations being conducted in violation of this Article or any other state or County regulations. Failure of the applicant to comply with any of the terms and conditions of the Grading Permit shall be sufficient cause for cancellation of the Grading Permit. B The Permit Holder shall prevent releases of sediment and water from construction sites that have the potential to cause damage to private property or County -maintained infrastructure. In the event that construction activities result in erosion or sediment and water discharges causing damage, the Permit Holder shall immediately attempt to prevent PAGE 39 2024-0065 ORD2023-16 further harm, by installing or replacing appropriate control measures and by correcting any unsatisfactory work. C Right -of -Way Damage. The Permit Holder shall correct any unsatisfactory work. Actions to remedy unsatisfactory work may include the patching and/or the removal and replacement of defective pavement. Other actions may be required. If the Permit Holder fails tc restore the County rights -of -way in the manner and to the condition required by the Deparment of Public Works, or fails to satisfactorily and timely complete all restorations required by the Department of Public Works to a same or better condition, or in a timely manner, the County shall have the right to perform the restorations at the expense of the Permit Holder. Amend Sec. 3-12-130. Permit suspension or revocation. A. The County may deny, revoke or suspend any Grading Permit in order to protect the public health safety and welfare. Permit Holders hold Grading Permits as a privilege. The County reserves the right to revoke any Grading Permit without a fee refund when the Permit is issuec in error, based on incorrect information provided by the applicant, or when the Permit is issued in violation of any provisions of this Article. B. The g -ading permit will be suspended should the County determine that the Permit Holder has committed a substantial breach of the terms or conditions of any statute, ordina ice, rule, or regulation, or any condition of the Grading Permit itself. Weld County will nctify the Permit Holder of the Grading Permit suspension by either phone, or in writing, and mandate that the Permit Holder remedy the violation. The demand shall state that continued violations may be cause for revocation of the Grading Permit. Further, a substantial breach shall allow the County to place additional or revised conditions on the Gradir g Permit. C Within twenty-four (24) hours of receiving notification of the suspension, the Permit Holder shall contact the County with a plan of correction which must be accepted. The Permit Holder's failure to contact the County, to submit an acceptable plan, or to reasonably implement the accepted plan shall be cause for immediate revocation of the Grading Permit and termination of work. Upon revocation of the Grading Permit, the Permit Holder will be required to re -apply for a new permit and will be charged for any additional fees that may be applicable. Amend Sec. 3-12-140. Penalties. A. Violations and Penalties. The County, through the Departments of Planning Services and Public Works or other County departments so authorized, may enforce this Article through methods included in this Article or through other methods adopted by the Board of County Com rr issioners. Remainder of section — No change. PAGE 40 2024-0065 ORD2023-16 ARTICLE XIII - Right -of -Way Use Permit Policy Amend Sec 8-13-110. General The County strives to keep its road right-of-way in a state of good repair and 'free from unnecessary encumbrances The Right -of -Way Use Permit is a tool to regulate and permit the use of Weld County's public road right-of-way by private companies, municipalities and/or special district constructing and burying lines either crossing or running parallel within Weld County road right-of-way Crossings are allowed for all lines parallel installations are allowed for lines of "public utilities" that are defined in C R S § 40-1-103 and are "domestic or foreign electric light power, gas, or pipeline companies" holding current Certificates of Public Convenience and Necessity issued by the Colorado Public Utilities Commission, for water lines of municipalities, water districts, ,and water and sewer districts, for transmission lines or pipelines used solely for agricultural purposes, for fresh water above -ground transfer pipelines, and for lines in non - maintained road right-of-way if approved by Weld County based upon locational factors, such as, surrounding population density, topography, or if the road right-of-way provides access to a recorded exemption lot, and with Permittee's agreement to move the line at its sole expense if Weld County or an annexing municipality intends to improve the road right-of-way, or if authorized by the Board of County Commissioners in an appeal of the denial of a Right -of -Way Use Permit application, pursuant to Section 8-13-110, below Public road right-of-way subject to regulation by the Right -of -Way Use Permit includes Weld County's maintained and non -maintained road right-of-way, and all public drainage easements A Right -of -Way Use Permit grants the Permittee and its Contractors permission to occupy designated County road right-of-way The Permit authorizes excavation, surveying, and/or construction of facilities within the County road right-of- way and provides for their subsequent restoration upon completion of the Project This Policy shall' apply within all unincorporated areas of the County Amend Sec 8-13-20. Purpose. This Article recognizes the importance of protecting the health, safety and welfare of the traveling public, maintaining efficient traffic flow and preserving the integrity of Weld County's road right-of-way Amend Sec. 8-13-30 Regulation of work in county road right-of-way A Issuance of'Right-of-Way Use Permit A Right -of -Way Use Permit shall be issued only in compliance 'with the rules and regulations set forth in this Article In no event shall construction within the County road right-of-way be allowed or permitted if it is detrimental to the public health, welfare and safety B Right -of -Way Use Permit Necessary A Right -of -Way -Use Permit is required for occupying,' constructing, maintaining or excavating facilities within, and for encroaching upon, any County road right-of-way i C No Work Without Right -of -Way Use Permit No person or entity may occupy, construct, perform maintenance or excavate within any County road right-of-way or easement, or encroach upon any County rights -of -way or easement, without, first having obtained a ' Right -of -Way Use Permit from the Department of Public Works In addition, no person or PAGE 41 2024-0065 ORD2023-16 entity may excavate, construct, perform maintenance or occupy the County road right-cf-way beyond the date or dates specified in the permit unless: (1) the person or entity -equests a written extension before the expiration of the initial permit, and (2) a new permit or extension is granted. Amend Sec. 8-13-40. Definitions. For the purpose of this Article, the following terms, phrases, words and their derivations shall have the meanings given herein: Perrnil tee means the owner, operator, person and/or entity constructing , excavating or occupying the County road right-of-way who has obtained a permit pursuant to this Article. Right- Df--Way (ROW, means a portion of land that is dedicated or granted to and accepted by Weld County for transportation purposes, such as a roadway or highway whether maintained or non-mairte fined by Weld County. The term is used as both singular and plural. Remainder of definitions — No change. Amend Sec. 8-13-50. Right -of -Way Use Permit application. Comp ete Application Required. Applicants shall file a complete application for a Right -of -Way Use Permit. Based upon the information provided in the application, additional submittals may be required by the Department of Public Works if sufficient information was not provided for review of the application. An application shall be considered complete if it is submitted in the accepted form, includes all mandatory information, including all supporting materials specified by aoplication. If an application is determined to be incomplete, the Department of Public Works shall Drovide notice to the applicant, along with an explanation of the application's deficiencies. No further processing of the application shall occur until the deficiencies are corrected in a future resubmittal. An application which is determined to be incomplete may or may not retain its same processing cycle. The Right -of -Way Use Permit is found in Appendix 8-P, the terms and conditions of which are incorporated into this Article. Amend Sec. 8-13-60. Application review, Right -of -Way Use Permit issuance, permit expiration ar d permit extension. A. Review Process. The application and other data filed by an applicant for a Right -of -Way Use Permit shall be reviewed by the Department of Public Works. The application may also be reviewed by other departments or agencies to verify compliance with any applicable laws. If the Department of Public Works finds that the work described in an application for a Right -of -Way Use Permit conforms to the requirements and regulations set forth in this Article, meets the requirements defined in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q) or other pertinent laws regulations or ordinances, and that all required fees have been paid a Right -of -Way Use Permit shall be issuec to the applicant. Criteria upon which the Right -of -Way Use Permit shall be consicered include, but are not limited to, the following: PAGE 42 2024-0065 ORD2023-16 1 Safety: Occupation, construction, maintenance or excavating within the County road right-of-way must not create a safety hazard to the travelling public. 2 Constructability: All construction. maintenance or excavation within the County road right-of-way must be able to be performed according to general construction practices. B — No change. C. Permit Limitations. An approved Right -of -Way Use Permit requires the Permittee to meet certain permit specifications and general engineering standards when working within the Weld County road right-of-way. The Department of Public Works shall be responsible for ensuring compliance with such specifications and standards. Reasonable care should be used to avoid damaging the existing roadway and/or County road right-of-way. The issuing and granting of the Right -of -Way Use Permit shall not be construed to be a permit for, or an approval of, any violation of any of the provisions of this Article or of any regulations of the County. D Indemnification. The Permittee, its agents, employees, subcontractors, Contractors and assigns, hereby agrees to hold Weld County, Colorado, the agencies thereof and their officers and employees harmless from any and all loss and damage or any claims which may arise out of, or be connected with, the construction, installation, maintenance, alteration, removal or presence of the lines installed and/or constructed herein referred to or any work or facility connected therewith, within the area covered by this permit; excluding any such loss and damage or any claims (including consequential damages) which may be caused solely by the negligence of the County, the agencies thereof or its officers and employees. The Permittee fully understands that all line installation, construction, maintenance and relocation will be performed at no expense whatsoever to the County. E. Permit Expiration. Every issued Right -of -Way Use Permit shall expire if the work authorized by the permit has not substantially begun within three (3) months from the date of the permit issuance or if the construction of work authorized by the permit is suspended or abandoned for a period of one (1) year at any time after the work has begun. Before work can begin or be resumed, a new permit must be applied for and reissued by the Weld County Department of Public Works. F Permit Extension. Any Permittee with an unexpired Right -of -Way Use Permit may apply, in writing, for an extension of the time within which work may begin or be completed under that permit if the Permittee is unable to begin and complete work within the time required for good cause, and that the cause is acceptable to the Weld County Department of Public Works. If Permittee does not apply prior to the Permit expiring, the Permittee shall reapply for a new Permit. Projects in progress under and expired Permit shall suspend work until a new permit is issued. There shall be an extension fee assessed to cover administrative costs. PAGE 43 2024-0065 ORD2023-16 Amend Sec. 8-13-70. County authority. A Right -of -Way Use Permit is considered to be a license for use of the County road right- of-way. The Department of Public Works shall have the authority to suspend work, wholly or in part, because of the failure of the Permittee to properly execute the work in accordance with this Article. Weld County, notwithstanding the issuance of any permit or construction in Weld County road right-of-way, reserves the right to make any changes, additions, repairs or required relocation of any facilities within the dedicated road right-of-way at any time including, but not limited to, in connection with the relocation, reconstruction, widening and maintaining roads or road right-of-way, without compensating the owner. Amend Sec. 8-13-80. Permittee's general responsibilities. The Permittee is responsible to comply with all of the terms and conditions set forth in this Article and the Right -of -Way Use Permit found in Appendix 8-P. Amend Sec. 8-13-90. Inspections. A. Inspection of work performed within Weld County road right-of-way, pursuant to an approved Right -of -Way Use Permit, is required. Inspections during the construction period will be made by the Weld County Department of Public Works to ensure that work is progressing in compliance with the Permit. If at any time during an inspection it is determined work is out of compliance with the Permit or there is a safety concern, a stop work order shall be enforced until compliance has been returned. It shall be the responsibility of the Permittee to provide safe access to the work site for the Department and tc all others, as authorized by law, for inspection at all reasonable times during the execution and upon completion of the work. At the time of inspection, the Department may order the immediate termination of any work which poses a serious threat to the life, health.. safety or well-being of the public. B It shal be the responsibility of the Permittee to notify the Department of Public Works when work is ready for inspection. The Department requires that every request for inspection be received at least forty-eight (48) hours before such inspection. Such requests may be made by telephoning, or emailing the Department. The presence of Department employees on -site shall not guarantee or qualify the Permittee's performance. The approved permit must be available on -site for review by Department staff. Failure to comply will result in suspension of the Permit. C. — No change. PAGE 44 2024-0065 ORD2023-16 Amend Sec. 8-13-100. Administrative fee. All required fees shall be paid in full prior to Permit issuance. The fee schedule for Right - of -Way Use Permits shall be as determined by resolution of the Board of County Commissioners and shall be shown on the permit. If the applicant objects to the denial of a permit application by the Weld County Department of Public Works, or objects to any of the terms or conditions of a permit thereby placed by the Department, the applicant has the right to appeal the decision to the Board of County Commissioners, in accordance with the procedures detailed in Section 12-4-110, below. Amend Sec. 8-13-110. Appeal of denial of Right -of -Way Use Permit. Remainder of section — No change. Amend Sec. 8-13-120. Failure to comply. A. — No change. B. The Permittee shall correct any unsatisfactory work including, but not limited to, defects in removal, replacement or patching. If the Permittee fails to restore the Weld County road right-of-way in the manner and to the condition required by the Weld County Department of Public Works or fails to satisfactorily and timely complete all restorations required by the Department, the County shall have the right to perform the restorations at the expense of the Permittee. C Weld County reserves the right to require relocation of any facilities within the dedicated road right-of-way at any time without compensating the owner. If the Contractor or Permittee does not perform the required relocation within four (4) months of notification from the Weld County Department of Public Works, no new permits will be issued from the Department of Public Works for the contractor until the relocation has been accomplished. Amend Sec. 8-13-140. Enforcement. A. — No change. B. Criminal Penalties. 1. It is unlawful to occupy, construct or excavate within any Weld County road right-of-way or encroach upon any County road right-of-way, unless a Right -of - Way Use Permit is first issued. Any person, firm or corporation violating any provision of this Article is guilty of a Class 2 petty offense, which, upon conviction thereof, shall be punishable by a fine of three hundred dollars ($300.00) or by imprisonment in the County jail for not more than ten (10) days, or by both such fine and imprisonment, for each separate violation. Each day during which such violation continues shall be deemed a separate offense. Remainder of section — No change. PAGE 45 2024-0065 ORD2023-16 ARTICLE XIV - Road Access Policy Amend Sec. 8-14-10. Intent of road access policy. This A-ticle XIV is established for the safe and efficient movement of traffic while allowing reasonable ard safe access to properties. It is necessary to protect the public health, safety and welfare to maintain conventional traffic flow along with unobstructed roadside drainage and to protect the fL notional integrity (safety, mobility, and capacity) of County roadways. Access management s an important tool in transportation planning, which identifies the safety, spacing and location of driveways, median openings, and the interconnectivity of road classifications to maintain the access and mobility function of collector and arterial roads. This Article XIV shall apply to all accesses utilizing County rights -of -way within the unincorporated area of Weld County. Amend Sec. 8-14-20. Purpose and intent. The purpose of access management is to manage the safety of existing and proposed accesses adjacent to land uses on County roads to ensure that safety, capacity, and function are preserved and a reduction in conflict points occurs. This Article XIV describes the minimum requirements or the design, construction and maintenance of accesses onto Weld County road rights -of -way and requires the issuance of an access permit prior to construction. Amend Sec. 8-14-30. Regulation of access onto County roadways. A. Access to a Single Parcel. Each parcel shall be limited to one (1) safe access point for safe ingress and egress, which may be an existing or new shared access, except if allowed pursuant to Subsection E., below. Access Permit Required. An access permit shall be required for any of the following: 1. Constructing a new safe access onto a County road right-of-way, 2. Reconstructing, paving, altering, relocating, or enlarging an existing access location, Changing the use or type of traffic of any existing access location, or Increasing the amount of traffic using an existing access location. C Issuarce of Access Permit. Access Permits shall be issued only in compliance with the rules and regulations set forth in this Article XIV. In no event shall an access be allowed, or permitted, if it is detrimental to the public health, welfare, and safety. No such work shall commence prior to the issuance of an Access Permit. D Emergency Access_ A lowed. Police, fire, ambulance and other emergency providers may have cirect access to County roadways, on a case -by -case basis in the interest of public safety., if no other access is permitted If allowed, the emergency access is not iintended to be used as a primary access accessible to the general public. The emergency access may be exempt from the minimum spacing criteria and shall be signed as emergency PAGE 46 2024-0065 ORD2023-16 access only, gated and include a Knox box, or other types of safety improvements. In no way shall the emergency access be in a location that poses a safety risk or jeopardize the public health, safety, and welfare of public and private property. E. Additional Access. Additional accesses to a parcel may be allowed if the applicant demonstrates a need for more than one access, the proposed accesses comply with the spacing criteria for that road, and no other safety concerns exist (e.g. sight distance concerns). If a new access is requested that does not meet the spacing criteria to a legal parcel where an existing access already exists, the additional access shall not be approved unless the denial of the new access would create undue hardship on the property owner, as determined by Weld County. Whenever multiple accesses to a single legal parcel exist, and additional accesses are requested, one (1) or more existing accesses must be removed, minimizing new accesses, and utilizing existing accesses. F Access Permit a Condition of Building Permit. 1. When a new or upgraded access location is to be constructed in conjunction with any construction authorized by a building permit, the issuance of an access permit shall be a condition for obtaining a building permit for such construction. 2. When the property owner intends to use a Historical Access Location in conjunction with any construction authorized by a building permit, the property owner shall apply for a new access permit for any existing access location never previously permitted. Unless otherwise required by this Article XIV, such access permit shall not require the closure, relocation, upgrade, or any other physical change to the Historical Access Location and shall be for the purpose of identifying the Historical Access Location. In that circumstance the property owner shall not be charged an access permit application fee. G Definitions. Access means the physical location where vehicles enter onto a maintained County road right-of-way. Change in Type of Traffic means a change to the type of vehicles that use the existing access location, including: but not limited to, a change from passenger vehicles to semi - trucks, or a change from agricultural equipment to passenger vehicles. Change of Use means a change in how a parcel that accesses onto a County road right-of-way is used, regardless of whether the parcel is within the unincorporated part of the County. Change of Use includes the construction of additional principal structures (e.g. homes, offices, etc.), the increase of intensity of an existing use (e.g. expansion of an existing business, etc.), change in zoning, change in lot lines, creation of new parcels, and other land use changes. Change of Use does not include construction of accessory structures, remodeling of existing structures that does not increase traffic to the site, or similar changes. PAGE 47 2024-0065 ORD2023-16 Historical Access Location means an unpermitted access that was constructed and in -use prior to the date that this Access Code was originally approved, July, 1, 2010. Unless there is a safety concern, Historical Access Locations may continue to be used in the manner they were historically used prior to that date. Any Change of Use, Change in Type of Traffic, increase in amount of traffic, or change to the physical location of the Historical Access Location (e.g. enlarging, reconstructing, paving, or otherwise altering) shall require a new access permit. Illegal Access means an unpermitted access that has been constructed or used when othenAise required to obtain an access permit. Illegal Accesses do not include Historical Access Locations that are used in the manner they were historically used prior to the original approval of this Access Code. H Access Approval as a Condition of a Land Use Case. When an existing, or shared access is to be utilized in conjunction with a land use case, the plat map shall identify the preliminary approved access location prior to recording the plat. The property owner shall apply =or an access permit when ready to construct the access and may be required to enter into an improvements and road maintenance agreement. I. — No change. Table 1 — Mirimum Access Spacing Criteria (Feet) — No change. Add J. Closure/Upgrade/Relocation of Accesses Presenting Safety Concerns. Weld County has the authority to order an existing access location (whether permitted, historical, or illegal) to be closed, upgraded, or relocated whenever it determines that a significant safety concern exists. Such action shall be made at the property owner's expense. Amend Sec. 3-14-40. Access permit application process. A. Submittal Requirements; Complete Application. An application for an access permit shall be considered complete if it is submitted on the required form, includes all mandatory inform 3tion, including all supporting materials and is accompanied by the applicable fee. The application must be signed by the property owner or, if applicable, an authorized agent. Written authorization to act on the property owner's behalf may be accepted if the access application is not signed by the property owner. If an application is determined to be incomplete, the Department of Planning Services shall provide written notice to the applicant, along with an explanation of the application's deficiencies. No further processing of the application shall occur until the deficiencies are corrected in a future resubmitted application. An application which is determined to be incomplete may or may not retain its same processing cycle. Subdivision or Common Development Plan Access. Upon approval Weld County may require one (1) access permit at the location where the proposed common development plan o- subdivision accesses to the County road to reduce the administrative burden on staff and applicants requesting permits concurrently for multiple lots. Such "development access" is subject to a development review application. PAGE 48 2024-0065 ORD2023-16 C — No change D Review Process The application and information provided by an applicant for an access permit shall be reviewed by Weld County The application may be reviewed by multiple departments or agencies to verify compliance with any applicable laws and codes If Weld County finds the information and supporting documentation in the 'application for an access permit conforms to the policies and requirements set forth in this Article XIV, meets the requirements defined in the Weld County Engineering and Construction Criteria, as shown in Appendix 8-Q, or in other pertinent laws, regulations or ordinances, and that all required fees have been paid, an access permit shall be issued to the, applicant E Changes in Approved Permit An approved permit shall not be changed, modified or altered without written authorization from Weld County All work shall be done in conformance with the approved permit F Permit Limitations An approved access permit expires after one (1) year from its date of issuance and requires the permit holder to meet the specifications and general engineering standards, of the Weld County Engineering and Construction Criteria, as shown in Appendix 8-Q The proper Weld County staff shall be responsible for ensuring compliance with such specifications and standards Remainder of section — No change Amend Sec. 8-14-50. Permit holder's general responsibilities. A permit holder is responsible to comply with the general provisions of this Code, including temporary accesses permits issued, for the following items Additional requirements and more detailed information are shown in the special provisions of the access permit A — No change B Traffic Control Access construction activities should not interfere with traffic on County roadways If, interference with traffic is necessary, a traffic control plan shall be submitted >, to, and approved by, the Department of Public Works as part of a Right -of -Way Permit application All traffic control shall conform to the most current version of the Manual on Uniform Traffic Control Devices standards, which is available for review on the Federal Highway Administration website All regulatory signs require approval of the Board of County Commissioners If applicable, the permit holder shall be required to install all necessary signage and shall bear all expenses for the fabrication and installation of road name,signs, permanent barricades, and signs required as part of a development project (e g , one way, no parking, no outlet, stop sign, speed limit, etc ) C — No change , D Tracking control Permanent vehicle tracking controls provide stabilized site access where vehicles exit a location onto a paved road Vehicles are required to perform a complete revolution of all tires prior to entering a County -maintained roadway Effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles Commercial, industrial, PAGE 49 2024-0065 ORD2023-16 or hig'i traffic volume accesses shall provide permanent tracking control devices, which include, but are not limited to, double cattle guards or a paved (asphalt/concrete) tracking pad extending three hundred (300) feet into the site to mitigate impacts to the paved road, includ ng damages and/or offsite tracking of mud or other materials. Requests for temporary tracking control techniques must be approved by Weld County prior to installation. Temporary tracking control shall be used during construction unless permanent tracking control is installed ahead of construction activities; such devices include, but are not limited to, crushed natural aggregate (recycled crushed concrete or asphat shall not be used for any vehicle tracking pads) along with a geotextile fabric or pre -fa xricated vehicle tracking pads with approved dimensions. Use -by -right permitted agricu tural accesses are exempt from tracking control requirements. Tracking control is required for construction of accesses to prevent tracking from the site onto paved public roadways. The permit holder may be held financially responsible for damage to the roadway resulting from inadequate tracking control. All tracking control devices and desigrs must be in accordance with the Weld County Engineering and Construction Criteria, Appendix 8-Q. E Access Construction, Restoration and Clean-up. The permit holder is responsible for installation of the correct culvert size(s), materials, and the cost of installation for new acces 3 culverts whenever the installation of a culvert is made necessary by the creation of a new access from private property to a county roadway. Accesses should be constructed in a manner that minimizes erosion and does not result in disposition of silt and debris upon the county roadway or roadside ditches. Accesses which slope down toward the County road will be constructed to assure that water does not run onto or across the traveled public way. This may include designing the crown, borrow ditches, pans, or other elements so that they direct water to the existing drainage facilities along the road. The permit holder shall assume all responsibility for removing all debris assoc ated with the access construction activities and restoring the County roadway to pre-e)(isting conditions. The access permit may allow construction of the access without the need for obtaining a separate Right -of -Way Use Permit pursuant to this Chapter. Installation of commercial/industrial access(es) may require a traffic control plan to be approved with the access permit. the permit holder, upon notification from the Departments of Public Works and/or Planning Services, shall correct any items not consistent with the approved access permit within fourteen (14) days. If the permit holder fails to, restore the road right-of-way in the manner and to the condition required by the Departments, the County may remove the access or perform the restorations and invoice the permit holder for the expense(s) incurred by the County. F Access Sight Distance. Sight distance is essential to protect the traveling public at all access points along County roadways. Sight distance is the length of roadway that is clearly visible to the driver and is dependent upon the height of the driver's eye above the road surface, the specified object height above the road surface, and the height of sight obstructions within the line of sight. The minimum sight distance available on a roadway must be sufficient to enable a vehicle traveling at or near the design speed to stop before reachi -ig a stationary object. In evaluating the overall performance of a roadway, both the horizoital and vertical sight distances must be considered. When items such as walls, buildirgs, bridge piers, cut slopes, or vegetation growth are near the roadway on the inside of a cL rve, they can block a driver's view of the road ahead. If they are too close, the driver PAGE 50 2024-0065 ORD2023-16 will not have sufficient distance along the curved roadway to stop when a hazardous condition comes into view. The minimum requirements and technical criteria for sight distance are in the Weld County Engineering and Construction Criteria Manual, Appendix 8-Q. Amend Sec. 8-14-60. Variance from specific access permit requirements. A property owner may request a variance from specific requirements set forth in this Article XIV. Weld County will consider requests for variances on a case -by -case basis. Requests for variances may be submitted in a written letter to Planning Services addressing the hardship or justification for the variance and supporting documentation to explain why they cannot comply with the requirements of this Article or as outlined in the Weld County Engineering and Construction Criteria, Appendix 8-Q. Requests will be reviewed and acted upon by the Planning Services Director or designee to ensure they will adequately protect the public health, safety, and welfare. Weld County staff will respond with an approval or denial in writing within thirty (30) days of receipt of the variance request. Amend Sec. 8-14-70. Appeal of denial of access permit. If an access permit is denied by Weld County staff, or the applicant objects to any of the terms or conditions of a permit thereby placed by the County, the applicant has the right to appeal the decision to the Board of County Commissioners, in writing, utilizing the appeal procedures set forth in Section 2-4-10 of this Code. Amend Sec. 8-14-80. Enforcement. A. Violations and Penalties. The County, through the Department of Planning Services or other departments so authorized, may enforce this Article XIV through methods included in this Section, or through other methods adopted by the Board of County Commissioners. B Criminal Penalties. 1. — No change. 2. Whenever the Departments of Public Works and/or Planning Services, through one (1) of its employees, has personal knowledge of any violation of this Article XIV, it shall give written notice to the violator to correct such violation within sixty (60) days after the date of such notice. Should the violator fail to correct the violation within such sixty (60) day period, the Departments of Public Works and/or Planning Services may request that the Sheriffs Office issue a summons and complaint to the violator, stating the nature of the violation with sufficient particularity to give notice of said charge to the violator. The summons and complaint shall require that the violator appear in court at a definite time and place stated therein to answer and defend the charge. One (1) copy of said summons and complaint shall be served upon the violator by the Sheriff's Office in the manner provided by law for the service of a criminal summons. One (1) copy each shall be retained by the Sheriffs Office and Department of Planning Services and one (1) copy shall be transmitted to the Clerk of the Court. The County may install PAGE 51 2024-0065 ORD2023-16 barriers across or remove any access not conforming to this Article XIV during the pendency of the enforcement action. 3. and 4. — No change. C. thru E. — Nb change. F. Inspections. The Departments of Public Works and/or Planning Services or other County departments may conduct an inspection of each access that is the subject of the access permit to ensure full compliance with all provisions of this Article XIV and the terms of the permit. G. — No change. H. Access Permit Issued Erroneously or Upon Incorrect Information. Any access permit which has been issued in error or on the basis of incorrect information supplied by the permit holder, shall be considered void. In the event an access permit is void, no refund of permit fees shall be made unless the access permit was issued in error by Weld County staff. Notice Regarding Illegal Access. For an illegal access, the property owner shall be sent written notice of any illegal access location or use. The owner shall be given sixty (60) days notification of pending actions, after which the County may install barriers across, or remove, any access not conforming to this Article XIV. Any access, driveway or curb -cut being constructed within County road right-of-way without an approved access permit shall be required to stop work immediately and apply for an access permit. If the permit is approved, work may continue subject to the conditions of the permit. If the permit is denied, any w irk that has been completed must be removed and the road and drainage facilities return3d to pre-existing conditions acceptable to the Departments of Public Works and Plann ng Services, upon completion of any appeal or the time for appeal pursuant to the provis ons of Section 8-14-70, above. Amend Sec. 8-14-90. County authority. Notwithstanding the issuance of any access permit or the construction of any access, Weld County reserves the right to make any changes, additions, repairs, conditions, and relocation cr closure of any part of an access within the County road right-of-way at any time, including, bu- not limited to, in connection with the relocation, reconstruction, widening and maintaining cf the road or road right-of-way, without compensating the owner of the access for the damages to or destruction of the access. Amend Sec, 8-14-100. Access Control Plans (ACP's), and additional techniques and requirements for access on County roads. A. and B. — No change. C. Access Control Techniques. A reduction in accesses onto a County road will improve traffic flow, operations, and safety of the traveling public. To reduce the number of existing PAGE 52 2024-0065 ORD2023-16 access points, applicants may be required to implement the following access control techniques to reduce conflicts while maintaining adequate access to adjacent land uses. 1. Elimination. Applicants may be required to eliminate accesses identified as unsafe locations, where there are more than two (2) existing accesses for a parcel, or do not meet spacing requirements identified in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q). C.2. thru D. — No change. E Auxiliary Turn Lanes. Auxiliary lanes maintain the safety, traffic flow, and operation of a roadway or access. Auxiliary lanes are required when unique location factors exist such as roadway speed and traffic density, access volume, the volume of commercial trucks, the influence of nearby accesses, existing auxiliary lanes close to the proposed access, nearby traffic control devices, available stopping sight distance, and other topographic or roadway design factors. When applicable, the access permit holder is responsible for design, installation, any road right-of-way acquisition needed to accommodate the required lane width. Required auxiliary turn lanes must be installed according to the following traffic triggers: 1. thru 3. — No change. 4. A left turn acceleration lane with transition taper may be required if it would benefit the safety and operation of the roadway. A left turn acceleration lane is generally not required when the acceleration lane would interfere with the left turn ingress movements to any other access. Further auxiliary lane design criteria can be found in the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q). F Closure or Elimination of access. When an access is closed, abandoned or eliminated the permit holder shall assume all responsibility for any activities related to the closure/elimination and reclamation of access points stipulated to be removed. In the event the issuance of an access permit requires an existing access point to be "closed and reclaimed" it shall be completed by the stipulated date on the permit. If the county is closing an access, the property owner will be notified in writing, prior to the closure occurring of the date the County will close the access. Closure and reclamation activities may include, but are not limited to, reestablishing the profile of the burrow ditch, removing any culverts and gates in the fencing adjacent to the maintained road right-of-way, and attempting to reseed the affected area located in the road right-of-way with natural vegetation to the satisfaction of the Departments of Public Works and Planning Services. G Roadway Improvements. Projects with high traffic/trip generation or safety concerns may require public improvements; including but not limited to, auxiliary lanes, such as acceleration and deceleration lanes, exclusive left or right-hand turn lanes, or a traffic signal, in accordance with the Weld County Engineering and Construction Criteria Manual, as shown in Appendix 8-Q. If these types of roadway improvements are required, the permit holder will be responsible to enter into an improvements agreement with collateral. The agreement shall be approved by the Board of County Commissioners. PAGE 53 2024-0065 ORD2023-16 Remainder of section — No change. ARTICLE XV - Transport Permits Amend Sec. 8-15-40. General provisions. A. thru B.6. — No change. B.7. Travel routes may require build outs of turning radii or other road improvements necessary to accommodate movement of the Vehicle/Load. A Right -of -Way Use Permit may be applicable. Remainder of section — No change. Amend Sec. 8-15-50. Transport permits types. The fc Rowing Transport Permits are available as determined by the Department of Public Works for the movement of Extra -legal Vehicles and Loads on roadways under Weld County jurisdiction: A. thru E. — No change. Delete F. Amend Sec. 8-15-60. Transport permits application information. A. The Naximum Limits authorized for Annual Extra -legal Vehicles or Loads are as follows: 1. — No change. 2. Seventeen (17) feet in Width. Remainder of section — No change. Amend Sec. 8-15-70. Transport permit application process. A. — No change. B. Subm ttal Requirements. Applicant must submit a complete application form, required submittals, and fee to the Department for review. Required submittals may include, but are nct limited to: 1. Route survey and axle configuration drawing. B.2. tf.ru E. — No change. F Permit Expiration. PAGE 54 2024-0065 ORD2023-16 1 — No change 2 Oil Rig Permits expire five (5) days from the date of issuance Remainder of section — No change ARTICLE XVI - Vacation of Road Right -of -Way by Board of County Commissioners Amend Sec 8-16-30 Vacations of public road rights -of -way not within historic townsites or subdivisions A Complete petitions for vacation of public road rights -of -way not within historic townsites or subdivisions accepted by the Department of Public Works shall include 1 A complete Petition Application signed by the petitioner with an accurate legal description of the road right-of-way requested to be vacated 2 and 3 — No change 4 A list of all adjacent property owners within 500 feet or landowners who are not directly adjacent, but may be affected due to usage of the road right-of-way A 5 thru B — No change C Within six (6) weeks of the petition being received, and at least ten (10) days prior to the meeting at which the Board of County Commissioners is to consider vacating any public road right-of-way, the Clerk to the Board shall mail notice of the meeting to all persons owning land adjacent to the roadway to be vacated, including any landowner who the Department of Public Works reasonably determines may use the road right-of-way proposed to be vacated to access their property This notice shall not be required if the public road right-of-way has not been used as a roadway for at least twenty-one (21) years or since it was established Inadvertent errors by the Department of Public Works in determining who should receive such notice, or by ,the Clerk to the Board's Office in sending such notice, 'shall not create a jurisdictional defect in the process, even if such error results in the failure of a property owner to receive such notification Remainder of section — No change, Amend Sec.8-16-40 Requirements. A — No change B The Board of County Commissioners may approve or deny any request to vacate public road right-of-way as it determines to be in the best interests of the County The Board may consider any information or evidence it determines appropriate, including, but not limited to, the following, to be provided by the Department of Public Works 1 — No change PAGE 55 2024-0065 ORD2023-16 2. Whether the road right-of-way is a maintained or non -maintained public road, and 3. — No change. 4. Whether there is enough information to determine if the public needs this road right-of-way in the future for items such as utility easements. etc. A title commitment or land survey plat may be required. Remainder of section — No change. Appendix 8-A Reserved — NO CHANGE. Appendix 8-B Road Access Sketches — ATTACHED. Appendix 8-C Cattle Guards — ATTACHED. Appendix 8-C Dust Controls and Seasonal Adjustment Factor — ATTACHED. Appendix 8-E Weld County MS4 Area — ATTACHED. Appendices 8-F — 8-J. Reserved — NO CHANGE. Appendix 8-K 1-25 Corridor Plan — ATTACHED. Appendix 8-L Roadside Memorial Sign Application — NO CHANGE. Appendix 8-M Memorial Signs — NO CHANGE. Appendix 8-N Transportation Plan — NO CHANGE. Appendix 8-00 Functional Classification Map — NO CHANGE. Appendix 8-P Right -of -Way Use Permit — ATTACHED. Appendix 8-O. Weld County Engineering and Construction Criteria — ATTACHED. BE IT FURTHER ORDAINED by the Board that the Clerk to the Board be, and hereby is, directed to arrange for Municode to supplement the Weld County Code with the amendments contained herein, to coincide with chapters, articles, divisions, sections, and subsections as they currently exist within said Code; and to resolve any inconsistencies regarding capitalization, grammar, and numbering or placement of chapters, articles. divisions, sections, and subsections in said Code. BE IT FURTHER ORDAINED by the Board, if any section, subsection, paragraph, sentence, clause, or phrase of this Ordinance is for any reason held or decided to be unconstitutional, such decision shall not affect the validity of the remaining portions hereof. The Board of County Commissioners hereby declares that it would have enacted this Ordinance in each and eve -y section, subsection, paragraph, sentence, clause, and phrase thereof irrespective of the fact that any one or more sections, subsections, paragraphs, sentences, clauses, or phrases might be declared to be unconstitutional or invalid. PAGE 56 2024-0065 ORD2023-16 The above and foregoing Ordinance Number 2023-16 was, on motion duly made and seconded, adopted by the following vote on the 8th day of January, A D , 2024 BOARD OF COUNTY COMMISSIONERS WELD COUNTY, COLORADO ATTEST Kevin D Ross, Chair Weld County Clerk to the Board Perry L Buck, Pro-Tem BY Deputy Clerk to the Board Mike Freeman APPROVED AS TO FORM Scott K James County Attorney Lori Saine Date of signature First Reading December 4, 2023 Publication December 10, 2023, in the Greeley Tribune Second Reading December 20, 2023 Publication December 24, 2023, in the Greeley Tribune Final Reading January 8, 2024 Publication January 14, 2024, in the Greeley Tribune Effective January 19, 2024 PAGE 57 2024-0065 ORD2023-16 CHAPTER 8 - Public Works APPENDIX 8-B ROAD ACCESS SKETCHES DELETE APPENDIX 8-B IN ITS ENTIRETY - RESERVED Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 52 [EST] Page Sof24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS AMEND APPENDIX 8-C CATTLE GUARDS Weld County, Colcrado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 2 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS Date: PUBLIC WORKS DEPARTMENT 1111 H STREET, P.O. BOX 758 GREELEY, COLORADO 80632 WEBSITE: WWW.CO.WELD.CO.US PHONE: (970) 304-6496 FAX: (970) 304-6497 CATTLE GUARD INSTALLATION/RELOCATION REIMBURSEMENT AGREEMENT By signing this document, you have agreed to reimburse Weld County Public Works for materials to install a 16', 24', or 32' wide Cattle Guard. The Cattle Guard location is on CR between CR/Hwy and CR/Hwy at tenths of a mile N, S, E, or W of CR/Hwy Cattle Guard design shall be in accordance with Weld County specifications and details. Installation will be done by a Weld County Public Works crew at the agreed location. Payment is required prior to installation. A price breakdown: Cattle Guard width Foot:Total $ Landowner(s): (please print) (signature) (please print) (signature) Landowner Address: Landowner Phone: Weld County Representative Title ** Sign one copy and send the signed copy with payment to Weld County Public Works at P.O. Box 758, Greeley, Colorado, 80632 Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 3 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS 41 0 N I CONSTRUCTION DETAILS w CO Ct 0 a. Weld County, Colc~ado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 4 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #1 (cont'd) 2 I/2. 21/2.5 TYPICAL FOR ALL CONNECTIONS BASE A a C BASE B NOTE OPPOSITE HAND BOLTING PATTERN FOR SECTION A 8 C RESPEC7IVELY C lOa 207 THREE 13/i6 DIA S IN EACH ENO OF BEAMHOLE • _ 4155j i' I CHANNEL LENGTH 9-4. Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 52 [EST] Page 5 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS 42 SECTION A -A r*A t/4 "x 2 STRAP CON CKETE BASE MISIP _ a r.m I I U I I- r"r I I I I I T i i I r CROSSBAR �--- CIO x 20.7 CHANNEL '+A PLAN VIEW 9 7'-t0" J 14 2 24'-O W 8 Y 17 STRINGER 6 -4 I 6" MIN. MIN. THICKNESS 7 GAGE CROSSBAR DETAI L CONERET E BASE NO. 4 BARS WIT} -4 2" COVER . �J NO. 4 STURRIPS AT I8. CC WfTH 2� COVER. CATTLE GUARD fESIGNED CHECKED APR C N/ E D DON CARROLL DREW SCHELTING WAYNE SMYTH WELD COUNTY ENGLNEERINf DATE MARCH 31 , 1981 Weld County, Colcrado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 6 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #2 (cont'd) Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 52 [EST] Page 7 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS 43 C OSS BAR _ 1 I2 -0 x 7- 9 1 t _ 6' TYPICAL WHERE > x/16 r� 3 CROSSBAR OR STRAPS CJ OR STRINGERS CONTACT 3' I/4" x 2 ' STRAP _04_415/6" 2' 2 3� © 2' 2' .77 2' 2 ,.-w8x17 LikST7- RINGER 9 LON ENTER STRINGER SPACING DETAIL SUPER- STRUCTURE GENERA NOTES SUPER STRUCTURE TO BE SUPPUED IN TWO SEPERATE I2 -O. BY 7'-9" UNITS. ALL CONCRETE REINFORCING BARS T- BE CONTINUOUS. NO SPLICING OR LAPPING IS ALLOWED. ALL BC_TED CONNECTIONS ARE TO BE DOUBLE NUTTED. ALL ANCHOR BOLTS, NUTS , WASHERS AND CLIPS RE TO BE GALVANIZED . MATERICU.S SHALL MEET THE STATE DEPARTMENT OF HIGHWAYS, DIVISION OF HIGHWAYS , STATE OF COLORADO, STANDA ID SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION, 1991 OF THE FOLLOWING SECTIONS. SEC 50'.03 STRUCTURAL CARBON STEEL ( ASTM A36) SEC 6O, .O2 CONCRETE (CLASS A ) SEC 7o9.Ot REINFORCING STEEL (GRADE 4O) Weld County, Colc ado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:52 [EST] Page 8 of 24 CHAPTER 8 - Public Works APPENDIX 8-C CATTLE GUARDS CATTLE GUARDS #4 ANCHOR DETAI L DOUBLE NUTTED ,ANCHLI DOUBORLE CWASPH HER W 8 x 17 STRINGER a 1/z' f 'l 3/8 . PLATE —y 13/16'OIA HOLE -6- 1- ANCHOR CLIP DETAIL 3/8' PLATE ti� 13/16' s 4 HOLES O O I I O z' I 3° 4- 3" 2' f N Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 52 [EST] Page 9 of 24 CHAPTER 8 - Public Works APPENDIX 8-D DUST CONTROLS AND SEASONAL ADJUSTMENT FACTOR DELETE APPENDIX 8-D IN ITS ENTIRETY - RESERVED Weld County, Colcrado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:53 [EST] Page 10 of 24 CHAPTER 8 - Public Works APPENDIX 8-E Weld County MS4 Area DELETE APPENDIX 8-E IN ITS ENTIRETY - RESERVED Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 53 [EST] Page 11 of 24 CHAPTER 8 - Public Works APPENDIX 8-K DELETE APPENDIX 8-K IN ITS ENTIRETY - RESERVED Weld County, Colcrado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 12 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA APPENDIX 8-P RIGHT-OF-WAY USE PERMIT The intent of the Right -of -Way Use Permit is to regulate and permit the use of Weld County's public right-of- way by private companies, municipalities and/or special districts constructing and burying lines either crossing or running parallel within Weld County right-of-way Crossings are allowed for all lines Parallel installations are allowed for lines of "public utilities" that are defined in CRS 40-1-103 and are "domestic or foreign electric light power, gas, or pipeline companies" holding current Certificates of Public Convenience and Necessity issued by the Colorado Public Utilities Commission, for water lines of municipalities, water districts, and water and sewer districts, for transmission lines or pipelines used solely for agricultural purposes, for fresh water above -ground transfer pipelines, for lines in non -maintained right-of-way if approved by Weld County based upon locational factors, such as, surrounding population density, topography, or if the right-of-way provides access to a recorded exemption lot, and with Permittee's agreement to move the line at its sole expense if Weld County or an annexing municipality intends to improve the right-of-way, or if authorized by the Board of County Commissioners in an appeal of the denial of a Right -of -Way Permit application, pursuant to Weld County Code Section 8-13-110 Public right-of-way subject to regulation by the Right -of -Way Use Permit includes Weld County's maintained and non -maintained, and all public drainage easements A Right -of -Way Use Permit grants the Permittee and its Contractors permission to occupy designated County right-of-way The Permit authorizes excavation, surveying, and/or construction of facilities within the County right-of-way and provides for their subsequent restoration upon completion of the Project The Permit is issued solely for the Permittee's and its Contractor's construction of the Project Permittee is prohibited from changing the use of the Project in any way without first obtaining a new permit SUBMITTAL REQUIREMENTS 1 Complete application Permittee must submit a complete Right -of -Way Use Application and include required submittals for review and consideration of its Project If the Project is approved, a Right -of -Way Use Permit will be issued to the Permittee It is the Permittee's responsibility to inform its Contractor of all Permit requirements, Provisions, and attached Special Provisions 2 Drawing, plan set, and map A drawing, plan set and map are required to be submitted with the Application Detailed plan(s), sketch, and/or map(s) showing the work location and roadway, edge of roadway, County ROW lines and width, at least one crossroad, and a legend It is preferred, that drawings be 11x17 or capable of being printed out in 11 x 17 All underground installations must include a cross section drawing showing depth of line being installed per County requirements based on the lowest point of the County ROW and show the County ROW width Engineer stamped plan and profile drawings are required for underground installations running parallel within a roadway Drawings at intersections must be in plan and profile, and shall be at a scale of 1 100 or as determined by the Department of Public Works 3 Traffic Control Plan A Traffic Control Plan (TCP) or Method of Handling Traffic (MHT) must be submitted and approved prior to Permittee's commencement of work Permittee shall provide all necessary traffic control in accordance with the Manual on Uniform Traffic Control Devices (MUTCD) in drawing form, narratives will not be accepted (a) Flaggers shall be required at any locations where there is encroachment into a travelling lane (b) Full road closure requests must be prepared by and signed by a Traffic Control Supervisor (TCS) (c) Full road closures exceeding three (3) days shall require approval of the Board of County Commissioners 4 Insurance Permittee and/or its Contractor shall secure and maintain insurance policies and/or provide proof of adequate self-insurance that will protect itself, its sub -contractors, members of the public who Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 54 [EST] Page 13 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA use tie right-of-way associated with the Project, and Weld County, Colorado, from claims for bodily injury, death, or property damage which may arise from the construction of the Project, or caused by the fe- cilities which are constructed as permitted herein. The Board of County Commissioners of Weld Coun y, Colorado, its officers, and employees must be named as an "Additional Named Insureds" in all liability insurance policies secured by the Permittee and/or its Contractor. The following insurance policies and amounts are required. Certificates of insurance evidencing such policies shall be delivered to the Weld County Department of Public Works: (a) Statutory Worker's Compensation. (b) Contractor's public liability and property damage in the following sums: Bodily Injury: Property Damage: Each person $1,000,000 Each accident $1,000,000 Each accident $1,000,000 Aggregate $2,000,000 (c) Automobile public liability and property damage in the following sums: Bodily Injury: Property Damage: Each person $1,000,000 Each accident $1,000,000 Each accident $1,000,000 5. Bonc ng and Surety. If determined necessary by Weld County's Department of Public Works, Permittee shall provide a surety bond or other security for the total amount required to restore the right-of-way undo- which the Project is to be installed or constructed, based upon current Weld County Department of Public Works contract prices for the performance of such work. Said collateral shall remain in effect for a period of two (2) years after inspection of completed construction by Weld County Department of Publi: Works. Whether or not covered by a bond, Permittee shall reimburse Weld County for all expenses incur-ed by it as the result of, or related to, the failure by Permittee or its Contractor to perform all insta lation, construction, maintenance or other work pursuant to this Permit in a workmanlike manner. 6 Geot2chnical Submittals. The Weld County Department of Public Works reserves the right to request from Permittee geotechnical submittals if deemed necessary. The grant Df this Permit is conditioned upon Permittee's and its Contractor's compliance with the General Provisions, Cons ruction Provisions, Pipeline Provisions (if applicable), and General Matters set forth below. By accepting this Permit, Permittee and its Contractor agree to comply with the terms and conditions set forth herein. GENERAL PROVISIONS 1. Perrr it Required. (a) Commencement of construction prior to receiving an approved Permit will result in applicable penalties (see emergency repair section for exclusions listed as item number 12). (b) Contractor must have a copy of this Permit on site during construction of the Project. (c) This Permit requires commencement of construction within three (3) months from date issued unless otherwise stated. The Permittee may apply for an extension if work is not completed before the expiration of three (3) months. All applicable fees must be paid before extension will be issued. 2 Inspction. Inspection of work performed in Weld County right-of-way is required. The Weld County DepE rtment of Public Works must be notified 48 hours prior to commencing all work within Weld County Weld County, Colc rado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 14 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA right-of-way. Final inspections are required. Weld County shall have the right to order Permittee or its Contractor to stop work anytime Weld County believes that a violation of this Permit has occurred or if there is a danger to the safety of the public if the work continues. 3 Additional Permits. Permittee shall be responsible for obtaining all other state, federal, or local permits which may be required of Permittee and/or its Contractor to install and/or maintain its Project. Permittee shall provide evidence of such other permits upon request by the Weld County Department of Public Works. 4 Determination of Placement. Weld County reserves the right to determine the specific placement of the Project or lines within its right-of-way. 5. Suspension of Work. Weld County's Department of Public Works shall have the authority to suspend work, wholly or in part, because of the failure of Permittee to properly execute the work in accordance with this Permit. Notwithstanding the issuance of this Permit, Weld County reserves the right to make or to require Permittee to make any changes, additions, repairs or required relocation of any facilities within the dedicated right-of-way at any time. 6. Setback Requirements. By accepting this Permit, Permittee hereby waives its right to require industry setback requirements which it might otherwise require from other utilities which may be placed in Weld County's right-of-way and relinquishes its authority over the placement of all other electric, power, gas, communications or other conduits, pipelines, appurtenances, or irrigation structures which Weld County may allow to be placed in its Right-of-way. Weld County must approve location prior to construction. 7 Compliance with Utility Notification Requirements. Permittee and/or its Contractor shall comply with all applicable requirements of C.R.S. §§ 9-1.5-101, et seq., and be responsible for locating all existing utilities and registering all new lines with 811. Contact the Utility Notification Center of Colorado at 811 or 1- 800-922-1987 at least two days in advance of digging. Markers and flags are valid for 30 days. Permittee must remove all utility locates such as flags and marker pins from the right-of-way once the construction is complete. Any subsurface utility engineering notification sent to the Colorado Notification Association shall also be sent to the Weld County Department of Public Works. 8. No Damage to Other Projects. No culverts, irrigation structures, drain lines, utility lines, or any other Projects or facilities within the right-of-way are to be cut or damaged. In the event Permittee or its Contractor damages an existing facility, Permittee shall first notify the owner and either immediately repair and replace the damaged facility or pay the owner to repair and replace the same in accordance with the desires of the owner. 9. Emergencies. Permittee shall report all emergency repairs to Weld County Public Works immediately upon being advised that an emergency exists. During such repairs, Permittee shall utilize proper traffic control measures. Permittee shall apply for a Right -of -Way Use Permit and make the required repairs as soon as practicable after the Weld County Department of Public Works is notified of the emergency situation and the need for such repairs. In no event shall such repairs be completed later than 24 hours after receiving such notification, unless adverse weather conditions prohibit the repair process. 10. Changes Made to the Right-of-way - Permittee's Financial Responsibility. In the event changes are made by Weld County to the right-of-way or appurtenances within the right-of-way that would necessitate removal or relocation of the Project, Permittee shall do so promptly at its own expense upon the request of Weld County. 11. Permittee Responsible for All Project Related Expenses. The construction, operation, maintenance and repair of the Project constructed by Permittee, and all other improvements described in this Permit, shall be at its own expense and without the aid or use of Weld County funds. Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 15 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA 12. Permittee Solely Responsible. Permittee or its successors and assigns, remains solely responsible for all matte -s pertaining to the Project and all costs associated with or pertaining to the Project. These respo isibilities include, but are not limited to, the following: repair and maintenance of the physical comp )nents of the Project; removal of the physical components of the Project upon retirement of the use o following the request of Weld County to remove the Project; cooperation with Weld County and other Permittees whose projects are placed in Weld County's right-of-way. 13. Succe;sors and Assigns of Permittee. It is mutually understood and agreed that this Permit and all the terms and conditions hereof shall extend to and be binding upon the Permittee and its successors, and assigrs. CONSTRUCTION PROVISIONS 1. Road Crossings. All underground installations crossing maintained or non -maintained Weld County roach rays and road rights -of -way shall be by directional bore unless otherwise approved by Weld County Public Works. 2 Paral el Installations. Parallel installations within the untraveled portion of Weld County road right-of- way nay be performed by bore, trenching, plowing, drilling or excavation. Parallel installation methods within the traveled portion shall be determined by the Department of Public Works. 3. Bridge Structures. (a) No lines shall be attached or otherwise placed along or upon any Bridge structure or wing walls. (b) No continuous line shall be installed crossing under a bridge structure. (c) Underground projects installed parallel to a bridge structure must maintain a minimum clearance of five feet (5') from all wing walls and pilings. 4. Mininum Cover for County Road Right -of -Way Installations. All depth requirements are minimums and are sibject to approval or modification by the Department of Public Works based on engineering and safer standards and existing utilities in the road right-of-way. In no event shall any facilities be installed in WF Id County road right-of-way at depth less than four feet (4') from top of line measured from the lower t point of the road right-of-way. (a) Dry utilities shall be installed at a minimum depth of four feet (4') from top of line measured from the lowest point of the road right-of-way (flowline). (b) Wet utilities shall be installed at a minimum depth of six feet (6') from top of line measured from the lowest point of the road right-of-way (flowline). (c) All types of oil and gas lines shall be installed at a minimum depth of ten feet (10') from top of line measured from the lowest point of the road right-of-way (flowline). Concrete surfaces shall be crossed at a minimum depth of fifteen feet (15') from top of line measured from the lowest point of the road right-of-way (flowline). (d) All line types crossing non -maintained road right-of-way shall be at a minimum depth of four feet (4 ) from top of line measured from the lowest point of the road right-of-way (flowline). (e) Culverts must have a minimum of twelve inches (12") of cover. 5 Daily Construction Requirements. At the end of each day during the installation and construction of the Project, Permittee shall observe the following requirements: (a) Working hours allowed under this Permit are from Sunrise to %z hour prior to Sunset. Weld County, Colceado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 16 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA (b) All materials shall be removed a minimum of ten feet (10') from outside edge of the road shoulder (c) All excavations upon the traveled portions of the road right-of-way shall be back -filled in accordance with the compaction requirements set forth below unless otherwise approved by Weld County (d) All traffic signs must be in place per the approved Traffic Control Plan or removed or covered if not applicable to nightly activities 6 Equipment Movement and Equipment Crossings (a) Movement of cleated or track equipment is restricted to the immediate work area Equipment shall be transported to a proper unloading area No cleated or track equipment may work on or move over any road way surface without mats (b) Equipment crossings shall require a separate permit and must meet safety and sight distance criteria for approval Crossings are in line with the Project and shall be built up level with the road surface with a practicable anti -tracking material to prevent damage to the road surfaces and shoulder areas Crushed concrete is prohibited for use as a surface material A minimum of a twelve -inch (12") culvert shall be placed in ditch areas under tracking pad to maintain proper drainage Existing ditch and upstream and downstream culverts must be observed in determining appropriate drainage culvert size 7 Site Markers Permrttee shall mark the site of the construction of the Project, whether permanent or temporary, with markers acceptable to Weld County Department of Public Works Markers shall be placed as far from edge of road as to not interfere with normal road maintenance 8 Future Line Location The installation of non-ferrous lines in the road right-of-way shall require a suitable means to facilitate future line location such as, but not limited to, metallic warning tape installed above the line and registration with 811 9 Concrete Surfaces There is a strict no cut policy on all concrete surfaces, which includes potholing Any damage or cutting of concrete surfaces will result in the Permrttee being responsible for the cost of a full replacement of concrete panel(s) by a Contractor approved by Weld County Bore grout may be required for underground crossings of concrete surfaces 10 Asphalt Surfaces Asphalt surfaces are not to be cut unless approved by the Weld County Department of Public Works If an asphalt surface cut is granted, the cut shall be repaired with a flowable fill cement (refer to Section 11 Compaction Requirements, below) and hot bituminous pavement and/or concrete placed at a thickness of existing plus one (+1) 11 Compaction Requirements (a) All compaction of backfills and road surfaces shall be compacted in accordance with the most current versions of the Colorado Department of Transportation (CDOT) Standard Specifications for Road and Bridge Construction and Field Materials Manual (b) All backfills located within an existing asphalt surface or under the asphalt not currently in place but will be as part of a new road construction, must be compacted using flow -fill cement in the upper three feet (3') of backfill (c) If any wet or non-compactable materials are produced from excavations, they shall be completely removed from the road right-of-way and replaced with compactable materials The road right-of- way shall then be returned to the original grades and cross sections Weld County Department of Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 54 [EST] Page 17 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA Public Works shall have the authority to determine what materials shall be discarded and what materials shall be acceptable as replacement. (d) On gravel roads where excavation materials are stacked on the road surface, road base of 1.5 inch surface gravel as specified in Chapter 9 of the Weld County Engineering and Construction Criteria Manual (Appendix 8-Q) specifications for surface gravel shall be spread over the entire road surface at a minimum depth of six inches (6") upon completion of the work. Shoulders on paved roads or barrow ditches where excavation is done shall require a minimum of four inches (4") of %-inch Class 6 aggregate road base material. Recycled Concrete will not be substituted for Class 6 aggregate road base. These amounts are minimums and do not supersede any requirements within the Permit. ( e) On gravel roads where excavation is done within the roadway, backfilling lifts greater than eight inches (8"), but not exceeding twelve inches (12"), shall be permitted providing that Permittee has suitable equipment to properly compact the depth of lift placed. Weld County Public Works shall determine if Permittee's equipment and the depth of backfill lift is appropriate. Ninety-five percent (95%) of a standard proctor shall be required at any trench depth or in replacement of any materials within the traveled portion of the road right-of-way. Eighty-five percent (85%) of a standard proctor shall be required at any trench depth or in replacement of any materials off the traveled portions of the road right-of-way. Installations running parallel within a gravel roadway will require a final placement of a minimum of six inches (6") of surface gravel after all of the Project has been placed and compaction test results are in compliance. Potholes in gravel surfaces shall be filled completely with road base and compacted. Potholes in asphalt shall be filled with a cement/grout to existing thickness plus 1 (+1) or filled with a compactable base material and the final placement a HMA or concrete material of existing thickness plus one (+1). Cold patching material is not an acceptable method of restoration. 12. Reseeding. Permittee shall reseed, with a seed mix approved by Weld County Department of Public Work, all areas within the road right-of-way in which vegetation was removed or disturbed during the insta lation of its Project. 13. Points of Access. Permittee shall install manholes and other points of access to underground lines within the Loundaries of the road right-of-way outside the normal wheel path of the roadway so that they do not cbstruct maintenance operations within the road right-of-way. Permittee shall, at its sole expense, adjust access points, when requested to do so by Weld County. 14. Survey Monuments. Permittee or its Contractor shall preserve or replace all survey monuments or benc-imarks at each work site. If such monuments or bench marks are destroyed, Permittee shall hire a registered land surveyor to replace destroyed monuments or bench marks. If Permittee chooses to preserve such monuments or benchmarks, it shall also hire a registered land surveyor to complete such preservation. (f) 15. Perrr ittee's Obligations Regarding Surveys. (a) All surveying performed within the boundaries of the road right-of-way shall be conducted with proper safety equipment and advanced warning signs; (b) Surveying permit holders can be issued an annual permit. (c) Any excavation within the boundaries of the road right-of-way will be backfilled with the same material or better than what was excavated. Weld County, Colc rado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 18 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA (d) Weld County Department of Public Works offers free monument boxes and lids to Permittee to establish, upgrade or perpetuate the location of an aliquot corner of any section on a paved road Permittee shall furnish the location of the section corners being preserved to the Department of Public Works when obtaining monument boxes 16 Permittee's Obligations Regarding the Completion of Project (a) Permittee shall place surface gravel, as specified in Chapter 7 of the Weld County Engineering and Construction Criteria, on all surfaces where any damage has occurred to the road surface from equipment, trenching, or storage of material Weld County shall determine the damaged areas, remedial work required, and timing of said work (b) Permittee shall complete road restoration including, but not limited to, clean-up (including utility markers), repair of damaged facilities, trench compaction, and replacement of gravel shall be kept within one (1) mile of new excavation (c) All disturbed portions of the road right-of-way or damaged road surfaces are to be returned to their original condition prior to demobilizing If the road right-of-way is not returned to original conditions, Weld County may perform or contract such remedial work and Permittee shall pay for all work or forfeit its surety bond in order to pay for all work done (d) Permittee shall own, maintain, operate and repair any line installed or constructed herein in accordance with the regulations, conditions and terms of this permit No lines installed within County rights -of -way may be abandoned by the owner at any time Although the lines may be retired, they may not be abandoned and all responsibility for such lines remains with the owner The County does not recognize, nor accept, any lines designated by any other source as abandoned, and the County will continue to expect such lines to be maintained or removed by the Permittee 17 Line Retirement Retirement of lines in Weld County road right-of-way are still required to be located as part of 811 If Weld County approves a line to be retired, the retirement of an existing line in the road right-of-way shall be subject to conditions as determined by the Weld County Department of Public Works based on the age, condition, material type, and size Permittee shall cut, cap, and fill lines that are not required to be removed 18 Line Abandonment If Permittee desires to abandon a line from being located as part of 811 notification, Permittee shall completely remove the line from Weld County road right-of-way, unless otherwise approved by Weld County 19 Drainage Interference Permittee shall not obstruct the natural free and clear passage of water along the roadside ditch flow lines or other waterways If surface drainage is to be affected, Permittee is responsible for the proper disposition of the runoff PIPELINE PROVISIONS 1 Natural Gas/Crude Oil Pipelines (a) Road crossings for natural gas/crude oil pipelines must be by directional bore, only (b) Above -ground appurtenances and/or equipment are not permissible for installation within the County road right-of-way and must comply with setback requirements 2 Permanent Fresh Water (Non -Potable) Pipelines (a) Road crossings for permanent fresh water (non -potable) pipelines must be by directional bore, only Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 54 [EST] Page 19 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA (b) Dermanent fresh water (non -potable) pipelines must extend past future road right-of-way prior to Jaylighting. (c) Above ground appurtenances and/or equipment are not permissible for installation within the :ounty road right-of-way and must comply with setback requirements. (d) Weld County approval is required for any change of use or retirement of a permanent fresh water ;non -potable) pipeline. 3. Temporary Above -Ground Transfer Pipelines. (a) Above -ground transfer pipelines are allowed as a temporary use for a period of 6 months or less for both road crossings and parallel installations. See the limitations and restrictions set forth below depending upon crossing methods. (b) Above -ground transfer pipelines may transfer fresh or recycled water and dairy irrigation slurry, only. (c) The source of water must be disclosed on the Right -of -Way Use Application and location maps. (d) The use of non -maintained Weld County road right-of-way for temporary above -ground transfer pipelines shall be negotiated with the landowner(s). (e) Existing driveway culverts may not be used for water transfers and permission from property owner must be provided for crossing private driveways or accesses. (f) All pipelines or lay flat pipes occupying the road right-of-way (running parallel to the roadway) must be secured up out of the ditch flowlines and away from the road edges. They may not interfere with normal road maintenance or impede drainage. All accesses and driveways shall be accessible and cannot be blocked by lay flat lines. Trailer mounted pumps shall be placed on private property and must be maintained and re -fueled on private property. Crossing methods for temporary above -ground transfer pipelines: 1) Plate/Manifold: a. Applicable for untreated gravel roadways for a transfer duration of 10 days or less. b. Must be covered with 1 1/2" surface gravel with a minimum of 15 -foot road base tapers on each side. All forms of traffic must be able to safely cross the plate/manifold. c. Traffic control signs required including a speed reduction to 15 mph for the duration of the transfer. d Permittee is required to maintain the crossing which includes 24 -hour snow removal in winter. 2) Culvert Sleeve: a. Applicable for longer term transfers crossing untreated gravel roadways only. b. Maximum culvert size is an 18" outside diameter for a single line transfer and 24" outside diameter Elliptical for a double line transfer unless approved by the Weld County Department of Public Works. c Minimum of 18" of 1.5" surface gravel cover on culvert. Weld County, Colcrado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 20 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA d Compaction tests of road base is required after culvert is removed if flowable fill is not used for final restoration of the roadway 3) Existing Culverts Requests for use of existing County culverts (any culvert crossing under a County maintained roadway or intersection) are subject to special review Use is for a maximum of 15 days b Existing culverts are not available for use from March through October Driveway/access culverts are not available for use d If the culvert also serves for irrigation, written permission from the Irrigation or Ditch Company may be required e Culvert must be cleared anytime drainage is impeded due to run-off or flooding or a significant rain or flooding event is forecasted Shut off valves should be placed on each side of culvert to allow for disconnection and removal 4) HDPE or PVC Pipe Applicable for longer term transfers where a paved, hard surface, or treated gravel roadway must be crossed b Pipeline installation is required to be at a depth of 10 feet based on the lowest point in the County ROW and ends must extend past future road right-of-way before daylighting Installation method by boring only Weld County approval is required for any change of use or retirement of the pipeline 4 Produced Raw Water Pipelines (a) No temporary above -ground transfers (b) Pipelines will only be considered for approval that are transferring to a State and County approved injection or recycling facility (c) Casing is required for crossing under County roadways (d) Casing type may be determined by the Permittee or its Contractor (e) Casing maximum outside diameter is not to exceed 12" (f) Casing ends must extend outside of the County road right-of-way (g) If Flex Steel Pipe or equivalent with a temperature rating of 180 degrees or higher is used, casing requirement will be waived (h) Maximum size of the produced water pipeline is not to exceed 8" and not to exceed 10" outside diameter (OD) Requests for larger diameter pipelines will require special review by the Weld County Department of Public Works Location markers shall be green in color and must list "produced water" and an emergency contact number 0) (1) GENERAL MATTERS Weld County, Colorado, Charter and County Code (Supp No 85) Created 2023-11-07 14 42 54 [EST] Page 21 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA 1. Terms (a) All references herein to "Right -of -Way" refer to a portion of land that is dedicated or granted to and accepted by Weld County for transportation purposes, such as a paved or gravel roadway or highway whether maintained or unmaintained by Weld County. The term is used as both singular and plural. (b) All references herein to "Permittee" are to any persons and/or entities applying for and being ssued this Right -of -Way Use Permit granting permission to construct their Project within Weld County's right-of-way. (c) All references here to "Lines" means all underground and overhead cable, telephone, electric, power, wire, gas and irrigation lines, and/or appurtenances, structures or pipelines. (d) All references herein to "Contractor" are to any persons or business entities retained by Permittee to install the Project in Weld County right-of-way. (e) All references herein to "Permit" refer to this Right -of -Way Use Permit, including all Permit requirements, Provisions, and attached Special Provisions. 2 Weld County's Limited Interest in Right -of -Way. Weld County owns a limited interest in the right -of- way and tnerefore, does not, by the issuance of this Permit, warrant its ownership of the right-of-way. Perm ttee is responsible for determining the ownership of properties traversed by its lines, the location of all property boundary lines, and the ownership of all right-of-way. Therefore, Permittee shall obtain from :he fee title owner(s) of the right-of-way or others having proprietary interests in the right-of-way such authority or rights as Permittee may need, in addition to this Permit for Permittee's use of the right- of-wEy. Permittee acknowledges and agrees that the authorization granted herein by Weld County is subje:t to Permittee's securing such authority or rights. 3 Rights Reserved by Weld County. Permittee acknowledges and agrees that the Right -of -Way which are the s abject of this Permit exist as public right-of-way for the primary benefit of the travelling public, and that the rights granted in this Permit to the Permittee are subject to Weld County's rights and obligations to pr?serve and maintain the right-of-way and the public's right to continue to travel safely upon the right-of-way. (a) Subject to the right granted herein to Permittee, Weld County reserves the remaining use of the Right -of -Way for existing and future construction, operation, maintenance, repair, replacement relocation and abandonment of its own use and facilities. (b) Weld County reserves the right to revoke this Permit at any time if Permittee or its Contractor fails to comply with the requirements of this Permit. Should this Permit be terminated for non- compliance by Permittee or its Contractor, any lines or facilities installed prior to the termination shall remain the responsibility of the Permittee and may be removed or maintained by Permittee at the sole discretion of Weld County. (c) This Permit is non-exclusive. Weld County reserves the right to allow other public and private utilities and entities to utilize the subject right-of-way and may impose location requirements and restrictions on Permittee in anticipation of requests by future public and private utilities and entities to occupy the right-of-way. (d) Weld County reserves the right to reconstruct, widen and/or maintain the right-of-way which are the subject Permit. In the event this work requires Permittee to incur expenses to preserve, re- locate or maintain its Project, Permittee shall do so upon notification from Weld County at its sole cost. Weld County, Colcrado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 22 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA 4. Indemnification. Except for the negligence of Weld County, Permittee shall indemnify and save harmless Weld County, its officers, employees, agents, successors and assigns from any damage or loss sustained by them or any of them, which arises by reason of Permittee's negligence with respect to the installation, upgrade and/or maintenance of the Project. 5. Hold Harmless. Permittee agrees to protect Weld County and save and hold Weld County harmless from any and all third party claims and damages which the installation and/or maintenance of Permittee's Project and related facilities may directly or indirectly cause. Additionally, Permittee releases Weld County from any and all claims and damages to property owned by Permittee resulting from any act, either by or on the part of Weld County or by or on the part of any third -party. 6 No Assignment. Permittee shall not assign any or all of its rights under this Permit without first obtaining written consent to such assignment from Weld County, which consent shall not be unreasonably withheld. However, in the event Permittee contracts with a third -party Contractor to perform the work associated with the installation of the Project, Permittee remains solely responsible for Contractor's compliance with the terms and conditions of this Permit. 7 Entire Permit Agreement. The parties hereby agree that neither has made or authorized any agreement with respect to the subject matter of this instrument other than expressly set forth herein, and no oral representation, promise, or consideration different from the terms herein contained shall be binding on either party hereto, or its agents or employees. This Permit embodies all agreements between the parties hereto and there are no promises, terms, conditions, or obligations referring to the subject matter whereof other than as contained herein. 8. Effect of Invalidity of Provision. If any term or provision of this Permit, or the application thereof to any person or circumstances shall, to any extent, be held invalid or unenforceable, the remainder of this Permit, or the application of such terms or provisions, to a person or circumstances other than those as to which it is held invalid or unenforceable, shall not be affected, and every other term and provision of this Permit shall be deemed valid and enforceable to the extent permitted by law. 9. No Waiver of Immunity. No term or condition of this Permit shall be construed or interpreted as a waiver, express or implied, of any of the immunities, rights, benefits, protections or other provisions, of the Colorado Governmental Immunity Act §§ 24-10-101 et seq., as applicable now or hereafter amended. 10. No Third Party Beneficiary. It is expressly understood and agreed that the enforcement of the terms and conditions of this Permit, and all rights of action relating to such enforcement, shall be strictly reserved to Weld County and nothing in this Permit shall give or allow any claim or right of action whatsoever by any other person not included in this Permit. It is mutually understood and agreed that this Permit and all the terms and conditions hereof shall extend to and be binding upon the Permittee and its successors, and assigns. SPECIAL PROVISIONS This Permit may be subject to additional Special Provisions. Such Special Provisions are attached hereto. Permittee Signature: Printed name: Date: Weld County, Colorado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 23 of 24 CHAPTER 8 - Public Works APPENDIX 8-P RIGHT-OF-WAY USE PERMITA AMEND APPENDIX 8-Q WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA 2020-weld-count-engineering-and-construction-criteria-final-version-2021-03-17.pdf Weld County, Colc rado, Charter and County Code (Supp. No. 85) Created: 2023-11-07 14:42:54 [EST] Page 24 of 24 APPENDIX 8-Q WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA 1 PAGE OF DOCUMENT INCLUDED IN PAPER FILE. REMAINDER RETAINED ELECTRONICALLY IN TYLER. 4.5.2 Corner Radii 30 4.5.3 Approval Requirements 30 4.5.4 Auxiliary Lanes 31 4.6 Cul-de-Sacs 31 4.7 Bridges 31 4.7.1 Bridge Hydraulic Capacity 31 4.7.2 Freeboard 32 4.7.3 Bridge Scour 33 4.7.4 Use of H EC-RAS 33 4.7.5 Bridge Railing 33 4.7.6 Minimum Structural Requirements 33 Chapter 5 Drainage Criteria 34 5.1 General 34 5.2 Drainage Law 35 5.3 Drainage Policy 35 5.3.1 Submittal Requirements 35 5.3.2 Data Collection 37 5.4 Rainfall 37 5.4.1 Intensity Duration Curves for Rational Method 37 5.5 Runoff 38 5.5.1 The Rational Method 39 5.5.2 Larger Basin Rainfall Methods 45 5.6 Roads, Inlets, and Storm Drains 45 5.6.1 Applicable Software 45 5.6.2 Roadway Drainage 45 5.6.3 Inlets 46 5.6.4 Pipes 46 5.6.5 Manholes 47 5.7 Cpen Channels, Roadside Ditches, and Grass Swales 48 5.7.1 Applicable Software 48 5 7.2 Open Channels and Swales 48 5 7.3 Roadside Ditches 52 5.8 Calverts 53 5.8.1 Applicable Software 53 5.8.2 Sizing 53 5.8.3 Materials 54 5.8.4 Cover 54 5.8.5 End Sections and Safety Grate 54 5.8.6 Maintenance 55 5.9 Riprap 55 5.10 Storage 62 5.10.1 Retention 62 5.10.2 Detention 63 5.10.3 Dam Information 73 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE Iii 5.10.4 Irrigation Ditches/Private Irrigation Systems 74 5.11 Stormwater Drainage Criteria Variances 75 5.12 Oil and Gas Stormwater Management 76 Chapter 6 GRADING and MS4 Requirements 77 6.1 Erosion Control AND Grading Requirements 77 6.1.1 Applicability 77 6.1.2 Grading and Erosion Control Plans 77 6.1.3 Implementation 78 6.1.4 Grading Permit Deadline & Extension 78 6.1.5 Tracking Control 79 6.2 MS4 Requirements 81 6.2.1 Designated MS4 Areas and Responsibilities 81 6.2.2 Applicability of MS4 Requirements 82 6.2.3 Required Permits 82 6.2.4 MS4 Requirements for Pre -Construction 83 6.2.5 MS4 Requirements for Construction Activity 85 6.2.6 MS4 Requirements for Post Construction 86 6.2.7 MS4 Requirements for As -Built Drawing Checklist 90 6.3 Revegetation 90 6.3.1 Site Preparation 90 6.3.2 Seeding and Planting 91 6.3.3 Mulching 91 6.3.4 Maintenance 91 6.3.5 Erosion Protection Design Criteria 92 Chapter 7 FEMA Floodplain Requirements 93 7.1 Background Information 93 7.2 Floodplain Management Obligations 93 7.3 FEMA Floodplains 93 7.3.1 Floodplain Requirements 93 Chapter 8 Traffic Criteria 95 8.1 Traffic Impact Studies 95 8.1.1 Traffic Impact Study Area 95 8.1.2 Preliminary Traffic Impact Analysis 95 8.1.3 Traffic Impact Study Requirements 96 8.1.4 Traffic Impact Study Checklist 100 8.1.5 Updating Existing Traffic Impact Studies 101 8.2 Change in Access Use 102 8.3 Temporary Access 102 8.4 Traffic Control Devices and Plans 102 8.4.1 Signage and Striping Plans 102 8.4.2 Striping guidance 103 8.4.3 Type and Location of Signs 103 8.4.4 New Roadway Signage 103 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I iii 8.4.5 Memorial Sign Applications 103 8.4.6 Construction Criteria 104 8.5 Access Points 104 8.5.1 Local Roadways 104 8.5.2 Collector Roadways 105 8.5.3 Arterial Roadways 105 8.5.4 State Highway and Interstate Systems 105 3.5.5 Shared Accesses 105 3.5.6 Restricted Movement Access 106 ,3.5.7 Access Control Plans 106 8.6 Access Design 106 8.6.1 Geometric Design 106 8.6.2 Access Sight Distance 107 8.6.3 Subdivision Roads Sight Distance 108 8.7 Auxiliary Turn Lanes 109 8.7.1 Auxiliary Lane Length 111 8.7.2 Storage Lengths 112 8.7.3 Auxiliary Lane Conflicts 113 8.8 Access Construction 113 E.8.1 Gravel Requirements 113 8.8.2 Pavement Requirements 114 8.8.3 Access Drainage 114 8.8.4 Structures 114 8.9 Average Daily Traffic Count 114 8..9.1 Vehicle Classification 115 Chapter 9 Soil Investigation and Pavement Design 117 9.1 Introduction and Purpose 117 9.2 F eld Investigation and Soil Samples 117 9 2.1 Testing Frequency 117 9 2.2 Sampling Procedures 117 9.3 Subgrade Testing 117 9 3.1 Classification 117 9.3.2 Swell Test 118 93.3 pH and Sulfate 118 93.4 Moisture Density 118 93.5 Hveem Stabilometer 118 9.4 Pavement Design Criteria for Onsite Roadways 118 9.4.1 Design Equivalent Single Axle Loads (ESAL) 119 9.4.2 Traffic Equivalence Load Factors 119 9.4.3 Traffic Growth Rate 119 9.4.4 Lane Factor 119 9.5 Flexible Pavement Design 120 9.5.1 Serviceability and Reliability 120 9.5.2 Standard Deviation 120 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE liv 9.5.3 Drainage Factor 120 9.5.4 Strength Coefficients 120 9.5.5 Pavement Thickness 121 9.5.6 Pavement Design 121 9.6 Material Specification 121 9.6.1 General 121 9.6.2 Procedure for Material Source Approval 121 9.6.3 Hot Mix Asphalt 122 9.6.4 Portland Cement Concrete Pavement 123 9.6.5 Aggregate Base Course 123 9.6.6 Aggregate Surface Course (Gravel) 124 9.7 Soils/Pavement Design Report 125 Chapter 10 Construction Criteria 126 10.1 General 126 10.1.1 Policy on the Use of Referenced Publications 126 10.1.2 Control of Work and Inspection 126 10.1.3 Project Acceptance and Warranty 127 10.2 Contractor Responsibilities 127 10.2.1 Qualifications, Insurance Requirements, and Licensing 127 10.2.2 Pre -Construction Meetings 128 10.2.3 Permits 128 10.2.4 Public and Worker Safety 128 10.2.5 Utility Coordination 129 10.2.6 Dust Control 129 10.2.7 Traffic Control 130 10.2.8 Removal of Unacceptable or Unauthorized Work 130 10.2.9 Record Drawings and Record Keeping 131 10.3 Materials Quality Control and Testing 132 10.3.1 Qualifications of Testing Personnel and Laboratories 132 10.3.2 Minimum Testing Types and Frequencies 132 10.3.3 Material Sources and Sampling 132 10.3.4 Required Submittals 133 10.3.5 Soils Reports and Pavement Designs 133 10.3.6 Materials Rejection 133 10.4 Excavation and Embankment 134 10.4.1 Utility Trenching and Backfill Requirements 134 10.4.2 Unsuitable Materials 134 10.4.3 Moisture and Density Control 134 10.5 Subgrade Construction Methods 135 10.5.1 Unsuitable Materials 135 10.5.2 Soft Spots 135 10.5.3 Moisture and Density Control 135 10.5.4 Subgrade Proof Rolling 135 10.5.5 Treated Subgrades 136 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I v 10.6 Base Course Construction Methods 136 10.6.1 Gradation and Moisture and Density Control 136 10.6.2 Base Course Proof Rolling 137 10.6.3 Treated Base Courses 137 10.6.4 Acceptance Prior to Paving 138 10.7 Pavement Construction Methods 138 10.7.1 Pre -Paving Meetings 138 10.7.2 Recycled Asphalt Pavement Surfaces 138 10.7.3 Hot Mix Asphalt Surfaces 138 10.7.4 Concrete (PCCP) Surfaces 139 10.7.5 Pavement Cut and Patching Requirements 142 10.8 Structures and Drainage Features 143 10.8.1 Bridges 143 10.8.2 Culvert and Pipe Installation 143 _0.8.3 Curbs, Gutters and Crosspans 143 _0.8.4 Concrete Structures, Manholes, and Inlets 144 10.8.5 Retaining Walls and Slope Stabilization Measures 144 10.9 Other Roadway Features 144 10.9.1 Pavement Markings 144 10.9.2 Traffic Control Devices (Signs and Signals) 144 10.9.3 Trees and Plantings 145 10.9.4 Sidewalks and Trails 145 10.9.5 Guardrails 145 10.9.6 Fences 145 10.9.7 Cattle Guards 146 Chapter 11 11.1 11.2 11.3 11.4 11.5 Permitting 147 Transport Permit 147 Right -of -Way Use Permit 147 ALcess Permit 147 Grading Permit 147 Fbodplain Development Permit 148 Chapter 12 Variance Requests 149 LIST OFF/CURES Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4 Figure 2-5 Figure 2-6 Figure 2-7 Figure 2-8 Rural Local and Collector Roads (Unpaved) (Interim) 9 Rural Local (Ultimate) 10 Rural Collector (Paved) 11 Rural Arterial 12 County Highway 13 Urban Local 14 Urban Collector 15 Urban Arterial 16 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I vi Figure 4-1 Figure 4-2 Figure 4-3 Figure 4-4 Figure 4-5 Figure 4-6 Figure 4-7 Figure 5-1 Figure 5-2 Figure 5-3 Figure 5-4 Figure 5-5 Figure 5-6 Figure 5-7 Figure Figure 5-9 Figure 5-10 Figure 5-11 Figure 8-1 Figure 8-2 Figure 8-3 Figure 8-4 Figure 8-5 Figure 8-6 Figure 8-7 Horizontal Curve 22 Minimum Tangent from Intersection 23 Intersection Cross Slope Detail 24 Horizontal Sight Distance 26 Crest Vertical Curve 27 Departure Sight Triangles at Intersection (Stop Control) 29 Typical Intersections 30 Weld County Watersheds 35 Manning's n vs. Depth for Low -Flow Section in a Composite Channel 51 Manning's n vs. VR for Two-Retardances in Grass -Lines Channels 52 Riprap Apron Detail for Culverts In Line with the Channel (USDCM, Vol 2 Figure 9-34) 57 Expansion Factor for Circular Conduits (USDCM, Vol 2 Figure 9-35) 58 Expansion Factor for Rectangular Conduits (USDCM, Vol 2 Fig 9-36) 59 Riprap Erosion Protection at Circular Conduit (Valid for Q/D2.5<6.0) (USDCM, Vol 2 Figure 9-38) 60 5-8 Riprap Erosion Protection at Rectangular Conduit Outlet (Valid for Q/WH1.5<8.0) (USDCM, Vol 2 Figure 9-39) 61 Water Quality Capture Volume (WQCV) Based on BMP Drain Time (USDCM, Vol 3 Fig 3-1) 66 Outlet Structure Plan and Profile Example 69 Emergency Spillway Typical Design 71 Access Approach 107 Departure Sight Triangles at Access (Stop Control) 108 Subdivision Road Sight Distance Triangle 108 Auxiliary Lanes Layout 109 Geometric Components of a Deceleration Lane 110 Geometric Components of an Acceleration Lane 111 FHWA Vehicle Classif cation (CDOT M -E Pavement Design Manual, Figure 3.6) 116 LIST OF TABLES Table 2-1 Table 2-2 Table 4-1 Table 4-2 Table 4-3 Table 4-4 Table 5-1 Table 5-2 Table 5-3 Table 5-4 Table 5-5 Table 5-6 Table 5-7 Typical Cross Sections Summary (Rural) 7 Typical Cross Sections Summary (Urban) 8 Roadway Design Criteria 21 Stopping and Passing Sight Distances and K Values 26 Decision Sight Distance 28 Design Frequencies 32 Runoff Coefficient Equations for Weld County/2008 MHFD (HSG-a) 39 Percentage Impervious Values for Weld County 40 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-A) 41 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-B) 42 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG C/D) 43 NRCS Conveyance Factor, K 44 Inlets for Weld County 46 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA t' A U b I Vii Table 5-8 Table 5-9 Table 5-10 Table 5-11 Table 5-12 Table 5-13 Table 5-14 Table 5-15 Table 5-16 Table 8-1 Table 8-2 Table 8-3 Table 8-4 Table 8-5 Table 8-6 Table 8-7 Table 8-8 Table 8-8 Table 9-1 Table 9-2 Table 9-3 Table 9-4 Table 9-5 Table 9-6 Table 9-7 Table 9-8 Table 9-9 Table 9-10 Table 9-11 Table 10-1 Theoretical Capacity of Inlets for Weld County 46 Manhole Sizes 47 Roughness Coefficients ("n") for Channel Design (After Chow 1959) 50 Trapezoidal Channel Design Guidance/Criteria 52 Maximum HW/D Requirements for Weld County 54 assification and Gradation of Ordinary Riprap 62 Drain Time Coefficients for WQCV Calculations 66 A/QCV Outlets Orifice Plate Perforation Sizing 67 \Ion -Jurisdictional vs Jurisdictional Dam Criteria Summary 73 Jpdating an Existing TIS 102 Minimum Intersection and Access Spacing Criteria (feet) 104 Access Geometry 106 Auxiliary Lane Requirements no Components of Speed Change Lane Lengths for Rural Highways (R -B) from State Highway Access Code 112 Acceleration/Deceleration Lane and Taper Design Criteria and Redirect Taper for Through _a nes 112 Grade Adjustment Factors for Acceleration Lanes 112 Auxiliary Lane Storage Lengths 113 Traffic Count Seasonal Adjustment Factors 115 -est Requirement and Frequency 118 Equivalence Load Factors (CDOT M -E Pavement Design Manual, Table H.2) 119 Lane Factors (Modified from CDOT M -E Pavement Design Manual, Table 3.3) 119 Serviceability 120 Reliability Factor 120 C rainage Factor 120 S:rength Coefficient 121 Master Range Table for Hot Mix Asphalt from Table 703-4 in CDOT's Standard Specifications for Road and Bridge Construction 122 Concrete Aggregate Gradation Table from Table 703-1 in CDOT's Standard Specifications for Road and Bridge Construction 123 Aggregate Base Course Requirements 124 Aggregate Surface Course Requirements 125 P3vement Marking Types on Asphalt and Concrete Roadways 140 LIST OF APPENDICES Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F Appendix G ,Held County Drainage Basin Map Drainage Report Checklist DOT Operations and Maintenance Plan Guidelines .\s -Built Drawing Checklist JSDCM 2007 Runoff Coefficients Rational Formula -Based Modified FAA Procedure Grading Permit Checklist WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF viii Appendix H Appendix I Appendix i MS4 Pollution Prevention Plan Checklist and Manual Traffic Impact Study Checklist Weld County Standard Details WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A V t, lix This page intentionally left blank WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I x CHAPTER 1 GENERAL PROVISIONS 1.1 TITLE This manual is called the Weld County Engineering & Construction Criteria and will be referred to throughout the text as the WCECC. 1.2 PURPOSE AND BACKGROUND Communities and counties often provide engineering criteria for the repair and construction of infrastructure, outlining specific "must build" requirements. In Weld County, Colorado, which covers 4,000 square miles, the range of soil types and site conditions is so varied that it is not practical or advisable to develop specific requirements. In Weld County, one size does not fit all. However, recognizing the need in the engineering community for basic information about the County's criteria for acceptable infrastructure, the County has developed this document. It outlines design and material options and guidelines for the design, construction, location, improvement, and maintenance of infrastructure in Weld County. The criteria outlined in this manual are intended to provide the designer with guidance to facilitate the development of infrastructure that is well suited to County needs and is safe, efficient, and economical. Some cases may arise where conformance to these criteria will be exceptionally difficult. In such cases, requests for variance to these criteria will be considered on a case -by -case basis. The overriding requirement is that all improvements must be designed and constructed with professional integrity and quality at the forefront. Additionally, designs will consider sustainability (reuse of existing materials where practical) and long-term total cost of ownership through life -cycle cost analysis. 1.3 APPLICABILITY The WCECC applies to all lot dividers, developers, landowners, and owners of facilities adjacent to or located in the County's rights of way or easements —and to the employees, agents, or contractors of these entities —when they design, construct, and maintain facilities or conduct other activities subject to review and approval under the provisions of the Weld County Code. The WCECC also applies to the County and its employees, agents, and contractors. 1.4 REFERENCE DOCUMENTS The WCECC hereby adopts the latest versions of the following documents by reference. However, some of these references represent nationwide and statewide standards, respectively, which do not always satisfy County conditions. When standards differ, the instructions and guidance in this manual will govern. • American Association of State Highway and Transportation Officials (AASHTO) A Policy on Geometric Design of Highways and Streets • AASHTO Guide for Design of Pavement Structures • AASHTO Roadside Design Guide • AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing • AASHTO Standard Specifications for Highway Bridges WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 1 • AAS-1-O Load & Resistance Factor Design (LRFD) Bridge Design Specifications • AASHTO LRFD Bridge Construction Specifications • American Society for Testing and Materials (ASTM) Annual Book of ASTM Standards • Colorado Department of Transportation (CDOT) Access Control Plans • CDOT 5ridge Design Manual • CDOT construction Manual • CDOT Drainage Design Manual • CDOT ._Told Materials Manual • CDOT it/1&S Standard Plans • CDOT M -E Pavement Design Manual • CDOT Roadway Design Guide • CDOT Srcite Highway Access Code • CDOT Srindard Specifications for Road and Bridge Construction with Weld County Special Revisions (aka Weld County Department of Public Works Conformed Standard Special Revisions to CDCT's Standard Specifications for Road and Bridge Construction) • CDO— Survey Manual • Colorado Revised Statutes • Relevant Federal Emergency Management Agency (FEMA) documents • Federa Highway Administration (FHWA) Manual on Uniform Traffic Control Devices (MUTCD) • FHWA Roundabouts: An Informational Guide (NCHRP Report 672) • FHWA Railroad/Highway Crossing Grade Handbook • FHWA Real Estate Acquisition Guide for Local Public Agencies ("The Uniform Act") • Institute of Transportation Engineers (ITE) Trip Generation Manual • Mile High Flood District (MHFD) Urban Storm Drainage Criteria Manual (USDCM) o MHFD is formerly Urban Drainage and Flood Control District (UDFCD) • Transportation Research Board (TRB) Highway Capacity Manual • Weld County Code • Weld County Transportation Plan 1.5 INTERPRETATION This manual presents the basic criteria that must be met to ensure that infrastructure facilities are safe, efficient, ecoroinical, and appropriate for use in the County. Where minimum values are stated, greater values for safety, durability, or functional limits are encouraged whenever practical and consistent with federal, state, a id local requirements. Situations might arise where the application of individual criteria from the WCECC will not ensure the protection of public health, safety, and welfare. Accordingly, Weld County may choose not to accept the infrastructure for taxpayer -funded maintenance; may impose additional or more stringent criteria than those contained in the WCECC; or may require the modification cf plans, specifications, or operations to protect public health, safety, and welfare. 1.6 ROAD ACCEPTANCE Acceptance of a road for maintenance by the County is at the discretion of the Board of County Commissioners (BOCC) and requires passage of a resolution. The Weld County Road Acceptance Policy requirements are. available in Section 8-6-150 of the Weld County Code. WELD COUNTY ENGINEERING Si CONSTRUCTION CRITERIA PAGE 2 1.7 IMPROVEMENTS AGREEMENTS Subdivisions, Planned Unit Developments, Final Plats, Uses by Special Review (USR) and Access Permits may require the developer to sign an improvements agreement with the County and provide collateral to guarantee the improvements are completed as required for one or all the following reasons: • Off -site public improvements • Road Maintenance Agreement • Construction Maintenance Agreement • Access Improvements Agreement • On -site improvements for subdivisions/PUDs More information can be found in Chapter 8, Article II, of the Weld County Code. An Improvements and Road Maintenance Agreement will detail the approved haul route(s), outline when offsite improvements will be triggered, and include a maintenance agreement for the haul routes. Possible mitigations included in the road maintenance agreement may include, but are not limited to, dust control, specified haul routes, damage repairs, and future improvement triggers. An example agreement is available at: https://www.weld.gov/files/sharedassets/public/v/1/departments/public-works/documents/usr-spr- permits-improvements-agreement-template.pdf Weld County uses the Equivalent Single Axle Load (ESAL) methodology when calculating an Improvements Agreement proportional share. The ESAL methodology is a national standard for normalizing traffic counts to reflect the actual damage caused by large vehicles. The ESAL method data is as follows: *Add factors & equation. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA F A U L 13 CHAPTER 2 ROAD CLASSIFICATIONS AND TYPICAL SECTIONS 2.1 ROAD CLASSIFICATION SYSTEM The County classifies roadways based on their function and whether they are urban or rural. These two classificatiors help designers determine the appropriate design characteristics for the road, including cross sectior and geometric standards. The functional classifications and urban/rural classification consider ant.cipated traffic volume and access requirements on a road and determine the minimum right-of-way required. Together, these classifications help determine the minimum level of service (LOS). They are a rational, cost-effective basis for the selection of geometric criteria within the range of values available to the Designer. The BOCC adopts a Road Classification Map by ordinance and reviews it every two years. Changes made between the two-year reviews typically are based on development reviews and are made on a case -by - case basis via a public hearing process. The current Weld County Functional Classification Map can be found on the Pualic Works Department's Transportation Planning web page. In addition, the Weld County Transportation Plan includes recommendations for when to modify road classifications. 2.1.1 Functional Classifications Function is determined based on the degree to which a roadway provides access and allows mobility. Roadways provide access when they allow travelers to easily reach most of the destinations within a given area. Roadways provide mobility when they allow travelers to easily go longer distances. The classifica-ior of Weld County roads is comprised of a hierarchy of roadways whose functional classifications are defined by their usage. The relative degree to which a road serves these functions defines its functional classification. Roads in Weld County are classified as Arterial, Collector, Local, or Private Roads. The functional classifications of roadways used by Weld County are described below. 2.1.1.1 Arterials A county highway refers to a highway defined in House Bill 16-1155. In Weld County a county highway is a four -lane controlled -access arterial road intersecting with an interstate highway, United States numbered highway, or State Highway. Roads that were annexed before the County's designation of the road as a county iighway also may be included by intergovernmental agreement (IGA) with the municipality. 'Held County has designated Weld County Road 49 (WCR 49) between Interstate 76 (1-76) and U.S. Highway 34 (US 34) Weld County Parkway, and Weld County Road 47 (WCR 47) from the Parkway to State Highway 392 (SH 392) as county highways. See the Weld County Functional Classification Map, available on the County's Transportation Planning webpage. The county highway designation mears Weld County will govern all substantive aspects of the road, including access, maintenance, traffic control, speed limits, and overweight limits, even if municipalities later annex the road Arterials provide good mobility, carrying significant traffic volumes at high speeds for long distances. They are seldom spaced at closer than one -mile intervals and serve to connect larger communities. The primary difference between interstate highways and arterials is access. Interstate highways have fully controlled accesses with no at -grade intersections, while arterials include limited at -grade intersections. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 4 2.1.1.2 Collectors Collectors link local roads with the arterial road system and connect smaller communities. Both mobility and access are of equal importance on these roadways. Travel speeds and volumes are moderate, and distances traveled are short to medium. Traffic on collector roads typically has an origin or destination within the nearby area. Weld County has both paved and unpaved collector roads. 2.1.1.3 Local Roads Local roads primarily provide access to adjacent land in rural and urban areas. Local roads are closely spaced and carry relatively lower traffic volumes for short distances. They generally are internal to —or serve an access function for —a residence, farm, single neighborhood, or development. Generally, they should lead traffic to a collector road. 2.1.1.4 Privately Maintained Roads Weld County may review privately maintained roads that are planned to be used by the public, such as a road within the boundaries of a residential subdivision, but the roads will be maintained by a homeowner's association (HOA) or other private entity. 2.1.2 Primary vs Secondary Classifications In addition to classifying roads by function, Weld County classifies roads as Primary or Secondary per (C.R.S.) § 43-2-101. Primary roads usually serve more developed areas and diverse uses (e.g., bicyclists, pedestrians, on - street parking, etc.). Primary roads usually are paved, with curbs, gutters, and sidewalks. Often, they connect to an existing stormwater drainage system rather than making use of roadside ditches (which are found commonly beside rural roads). Secondary roads primarily serve less developed areas and lower volumes of vehicular traffic. Most of the roads in Weld County are classified as secondary. However, roads that are in municipal Urban Growth Boundaries may be classified as urban/primary. 2.2 RIGHT-OF-WAY WIDTHS The minimum right-of-way widths are as follows, unless otherwise approved by the BOCC: Arterial 140 feet Collector 80 feet Local 60 feet 2.3 RIGHT-OF-WAY USE PERMIT Permits are required when working within the County road right-of-way. More information can be found in Section 11.2 of this document. See also Weld County Code, Chapter 8, Article XIII, Sec. 8-13-10, et seq. It is not the intent to allow new private irrigation systems to be located within County road right-of-way. 2.4 RIGHT-OF-WAY DETERMINATION On October 12, 1889, the BOCC declared all section and township lines on the public domain of the United States in Weld County to be public highways with the intent of constructing roadways on these WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA i 5 lines. With this order and for this purpose, the BOCC also established 30 feet of road right-of-way on each side of the section or township line (a total of 60 feet). Sections not included in the public domain are railroad sections, school sections (usually 16 and 36), and sections patented prior to October 12, 1889. Not all County roads are a result of the 1889 Resolution. Many Weld County rights of way have been conveyed by landowners through road petitions and dedications, as well as Weld County acquisitions working with landowners. Due to topography, cost, and other factors, not every county road is situated within the 60 -foot road right-of-way and/or centered on the section line. In some places, additional right-of-way has been acquired or reserved. The right-of-way section of the Public Works web page discusses this in more detail. The County recommends that designers review this information and also do their own research into right of way in the areas of their projects. The Weld County right-of-way road files are located in the office of the Clerk to the Board at 1150 O Street in Greeley, Colorado. Please call (970) 400-4225 to set up a time to come in. 2.5 RIGHT-OF-WAY ACQUISITIONS Acquisition of rcad right-of-way will substantially follow the Real Estate Acquisition Guide for Local Public Agencies aublished by the FHWA, the Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970, 42 United States Code (U.S.C.) Ch. 61 (the "Uniform Act"), and Title 38 of the Colorado Revised Statutes (CRS). 2.6 TYPICAL CROSS -SECTIONS While it is important to try to preserve the ultimate road right-of-way, funding availability does not always allow for construction of the ultimate section and, in such cases, an interim section should be constructed until funding becomes available. The Public Works Department determines whether a road is designed to the interim or ultimate (or combinations thereof) road cross section. This determination is based on funding, existing and projected traffic volumes, :onnectivity, continuity, mobility, and capacity. If only a portion of the ultimate cross section is being constructed, the interim design will need to allow for eventual widening of the road to the ultimate cross section. The interim design should ensure that the first phase of the roadway will not need to be removed to complete the full cross section. Storm drainage designs and floodplain analysis will be considered and be constructed to accommodate the ultimate section, unless written approval is obtained from the Public Works Department. All designs should consider how the roadway is used, long-term traffic predictions, location and density of nearby development, and topographical characteristics. A roadway constructed to the ultimate cross section still may require more right-of-way and roadway width in the future for additional lanes, pedestrian or bicycle facilities, landscaping, utilities, or construction requirements, such as cut or fill slopes. Designers should try to anticipate such needs. Other chapters within this manual will discuss design considerations in more detail. Table 2-1 (Rural Conditions) and Table 2-2 (Urban Conditions) summarize some of the features incorporated into the typical cross section drawings for the different road classifications. Figure 2-1 through Figure 2-3 present examples of typical cross section drawings for interim and ultimate roadway types found in the County. Note that the tables and typical sections in this manual usually reflect minimum requirements. The Public Works Department may impose additional requirements on a case - by -case basis. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 16 Table 2-1 Typical Cross Sections Summary (Rural) Classification Roadway Right Width -of (min.) -Way Surface Road Travel Number (min.) of Lanes Travel Width (min.) Lane Shoulder (min.)/Type Width Median (min.)/Type Width Drainage Type Sidewalk Width (min.) RURAL ROADS (INTERIM) Arterial 140 ft Paved 2 12 ft 6 2 ft ft Paved Gravel N/A Roadside Ditch N/A Collector 80 ft Paved 2 12 ft 4 2 ft ft Paved Gravel N/A Roadside Ditch N/A Collector (Unpaved) 80 ft Gravel 2 12 ft 2 ft Gravel N/A Roadside Ditch N/A Local (Unpaved) 60 ft Gravel 2 12 ft 2 ft Gravel N/A Roadside Ditch N/A RURAL ROADS (ULTIMATE) County Highway 140 ft Paved 4 12 ft 8 2 ft ft Paved Gravel 16 ft Paved Roadside Ditch N/A Arterial 140 ft Paved 4 12 ft 8 2 ft ft Paved Gravel 0 Paved Unpaved Separation ft to 28 or ft Roadside/Median Ditch Sewer or Storm N/A Collector 80 ft Paved 2 12 ft 6 2 ft ft Paved Gravel 0 Paved ft to 16 ft Roadside Ditch N/A Local 60 ft Paved 2 12 ft 1 ft 1 ft Paved Gravel N/A Roadside Ditch N/A Non Local Residential -maintained - 30 ft Unpaved RAP 2 10 ft 2 — 5 ft Gravel N/A Roadside/Utility Culverts located ROW property on outside landowner need to of Ditch be N/A Non Local Residential -maintained — 30 ft Unpaved Gravel 2 13 ft 2-2 Gravel N/A Ditch Culverts located ROW property swale on outside landowner need to of be N/A ft WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I7 Table 2-2 Typical Cross Sections Summary (Urban) Classification Roadway Right Width -of (min.) -Way Surface Road Travel Number (min.) of Lanes Travel Width (min.) Lane Shoulder (min.)/Type Width URBAN ROADS (INTFRIM) Median Width (min.)/Type Drainage Type Sidewalk Width (min.) Arterial 140 ft Paved 12 ft 6 ft Paved 2 ft Gravel Collector 80 ft Local 60 ft Arterial Paved 12 ft 5 ft Paved 1 ft Gravel Paved 12 ft 1 ft Paved 1 ft Gravel N/A N/A N/A Roadside Ditch or Storm Sewer N/A Roadside Ditch N/A Roadside Ditch URBAN ROADS (ULTIMATE) N/A 140 ft Paved 12 ft 16 ft Paved* 16 ft to 28 ft Paved or Raised Median Curb & Gutter and Storm Sewer Collector Local 80 ft 60 ft Paved 12 ft 8 ft Paved* 0 ft to 16 ft Paved *includes gutter pan width Paved 12 ft 8 ft Paved* N/A 10 ft Curb & Gutter and Storm Sewer 5 ft Curb & Gutter and Storm Sewer 5 ft WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 8 Figure 2-1 Rural Local and Collector Roads (Unpaved) (Interim) 1 _ NOT TO SCALE Buffer Shoulder Compacted Subgradc INTERIM TYPICAL CROSS SECTION Typical Gravel Road 16'1 - Notes: ilmar I. * The allowable class and thickness of Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Width of ROW shall be determined by classification of road. 6. Signing per approved plan. Computer File Information Creation Date: 02110 10 lank K H Last Modification late: 04108/16 Initials: ddd Full Rob: T:.PIiSCvkdmin\ProposaIs' Weldc Dunking File Name. \Iiir•.tic [H � Ver. X'\t Scale: N.T.S. tmh 1 r1;2li‘h WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 11 Stncct•Post 0nicc Box 754 Greeley, C'okxado ROM2-U7S$ Phone -1970) 304-6496 Fain t97n) MM -6497 ed knnrad: 'tensed: INTERIM RURAL LOCAL AND COLLECTOR ROADS Designer Weld C'osinty Deta:kr K. Hinnenkamp FIGURE NO. I WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 19 Figure 2-2 Rural Local (Ultimate) 16' Butler Varies F- rl NOT TO SCALE Computer File Information ABC (Class 5) * LIMA t 2W r 1 t 24' 2' * ARC (Class 6) —. I,. 12' Compacted Subgrade TYPICAL CROSS SECTION Notes: 16' Butler I. • The allowable class and thickness of Not Mix Asphalt (HMA ) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements 5. Signing and striping per appro% cd plan Civabcc thw 02 10:10 Inrtslt MI I At %t oli;s}x1 nit 01 04 I. Inca'. MI WELD COUNTY PUBLIC WORKS DEPARTMENT flail Path T PBS(' .Wmuti f roe e.ials %% 1h t ru Fak Stmt %lotns..zlioc z X %I tali. \IS S 1 fiat I.ngtlsh 14fie 11t1 II%tentPose ORhscNos 7fl tireds\ , l aknrsin K0632 -07S$ Pbn' Irv) ;la M% (4% 1trite V1.LAi.1' Oman val Ito nee Rona! RURAL LOCAL trury: N'cW County Jct.1:Sr_ K NtnncnUnp FIGURE NO. 2 1 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 110 Figure 2-3 Rural Collector (Paved) 22' Buffer Shoulder 80' R.O.W. 6' _t 24' _a__ 6 * ABC (Class 6) — Shoulder/1j Multi -Use Compacted Subgrade INTERIM TYPICAL CROSS SECTION U, R.().1�4' 20' Buffer Varies NOT TO SCALE 40' 8' 24' 8' houldcr/ Multi -Use 6' ABC (Class 5)-- * HMA — * ABC (Class 6) 12' 12' Travel Lane ' Travel Lane I *HMA t lot 1 Compacted Subgrade ULTIMATE TYPICAL CROSS SECTION Shoulder' Multi -Use 6' 20' Buffer "d Notes: I. * The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Signing and striping per approved plan. • Computer File Information Creation Qzte: 021010 initials: Ki I Last Modtfhati n Date: 01''(}3.' 12 Initials: Kt I WELD COUNTY PUBLIC WORKS DEPARTMEN I Full Path: T:\PBSCAdmin'IPraposals W'eice Dra mg Fik Name. M1cr.'. utken V'er. X\1 4s;.. NT S. Units. English illI II Strentost Office liox 758 Cheeky. Colorado 80632.11758 Phone 4970) 304-64% Fat (9711) 3114-M97 Apluorcd. Rnised' R.ntsod: RURAL COLLECTOR 1csigncr: Weld County l)ct:i kr K [IInnenI,.tmp FIGURE NO.3 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE X11 Figure 2-4 Rural Arterial 40' 40' 8' I 24' B u ft eer Varies lit 18. 1 ShoulderZ, 6' oss ABC (Class 5) HMA I 12' c 4 1,' travel Lane I travel Lane 40 • boulder I l-- Compacted Subgrade —* ABC (Class 6) INTERIM TYPICAL CROSS SECTION I 140' 1t0.W. 84'-96' I 0'-28' 511 SI Buffer 10' Varies Buffer • Shoulder Multi-Usc 8' 11' ravel Lane tio Travel Lane 7 10' aved or Unpave Sepabation I - 'I7temrasamones _►�-+_riS'!IL' c-a'ti: !st eeale �1PCi4/S' ' • a _ -.� �At'xamscm i<1t� •t �t� ►� M• s N Il tt 11 ii 11—N—{--{I+I1s11+ II _ 12' 12' Travel Lane Tra% el Lane * DM 10 Shoulder. Multi -Use --ABC *HMA — (Class 5) NOT e11 SCALE •IIMA— ABC -- (Class 5) ULTIMATE-IYPI('AI CROSS SECTION * ABC (Class 6) 1.7 22' - 18' Buffer Coilip.tL it:d Subgl adie Notes: 1. * The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Signing and striping per appro\ ed plan Computer File f iIormatlon lr.th t(kw 02 10 III K11 I .nt \LIrr..as+.n Ibi s 1 1114 I: K II WELD COUNTY PUBLIC WORKS DEPARTMENT f dl Pith T PBSC Mmin Pn pt" - I . \\ cltk ;loam err: F k'taric \1111 town 1 cr X' I "a:, `• I S I rule i ngli•h lilt li Siren Poo Office Bost 15* kpstu"`I tircckt. Colararl.' n mt:.rl'Ss1 Ptwec 49V) kg-t►i'* Fall tern► %ul_63y- tic, RURAL ARTERIAL heals. Weld l aunty lku:kr h Htnn:nkamp jFIGURE NO. 4 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 112 Figure 2-5 County Highway 1 140' R.O.W. 28' 10' 24' 1 16' 24' 10' 28' Buffer Varies .;* Shoulder! Multi -Use 8' Travel Lane 12' 12' Travel Lane Left Turn Lane 12' IF ravel LaneTravel Lane C 1 Shoulder/ Multi -Use 8' ardirillieguratera tb CS CS AA art a ` - � �� t'LlPhire aelor e c- ti 1:a :Ja ,a a �� • � ce • •'- c... NOT TO SCALE * ABC (Class 6) Compacted Subgrade COUNTY HIGHWAY TYPICAL CROSS SECTION 1 Buffer Notes: 1. * The allowable class and thickness of Portland Cement Concrete (PCC) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Signing and striping per approved plan. Computer File Information Creation Date: 02'10, I 0 Instals: K I I Last Mudd -cajun [Mlle: 01,`04112 laitials: K I I WELD COUNTY PUBLIC WORKS DEPARTMENT Full Path: T: P13SC•AdmintProposals \`'cldc Drew too rik Name %I; \' l,llkgn Ver, X\1 Scale: N.T.S. nuts. 1-nglisli I l I I ll StrcctPos$ Offacc Box 758 Greeley, C'uknr do 841632-01738 Phone. (V70) 304-6496 Fax (970) 304-6497 Approved: Revised: Rcrt!c4: COUNTY HIGHWAY 'evri ct: Weld County Dilater K IlmnrtiLimp FIGURE NO. 5 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 113 Figure 2-6 Urban Local 41 • w. U _ Buffer Shoulder Varies 16' 7 Ise 2' • i 24' 2' U I I2' I 12' Tra% cl Lane 10 r.'o * HMA I s� 1. .t 1r_or '.. %�_ is Z _ _ _ _ . _I_t�•_�1•)� ail -11 11==1i X11-11_Il ll- �_11-11_11'. 11-1111=IILil .. tt�tt�t•�_••�....-�i __ Travel Lane 10. r O 16' 0.10 ButTer Shoulder ABC (Class 5) •HMA • ABC (Class 6) - Compacted Subgrade INTERIM TYPICAL CROSS SECTION 60' WOLW 10' 40' 10' Sidewalk/ Curb' Buffer y imtit r► S' 12' K' Shoulder Multi -Use Tra%el Lane Travel Lane 2% -- • I I M A I CMS 70;0 Shoulder' Multi -Use Sidewalk Curb. S' Buffer 1. • �� , aN r ��_ tit r1r. .rs• �t��i r_�ll�'�' ?il►T•ri''•��I • sue, � �►. a.. a.a/t/^/1��it L!!�t�r•/fi!"�1l`titi�frl-a•—�■ .�- llama Iial11 1l amen `rte= `It 11=1r�1r=Willy Imre Ills II 11= ABC (Class 6) — Crinip.iiTed Suhgr,ldc ULTIMATE TYPICAL CROSS SECTION 5' Minimum Sidewalks as Required by Public Works NOT TO SCALE Computer File Information Notes: 1. 41, 3. 4 i'rratxac acct 02 10 10 Intuit KH l asi tit 01 04 1-2 In t cal. K l t WELD COUNTY PUBLIC WORKS DEPARTMENT Ors r�� The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. The foreslopcs and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. All sideslopes shall be seeded and mulched. Additional ROW may be required by Public Works to meet site specific requirements Signing and striping per approved plan. F.1I Pitt T MSC Adman Proposals wrWc ( rau Inc F k \sot 1lnrtultiun 1rr \AI s1., N T S I rut, I nglr.h I t 11 H Suet Post Otrkc Bo% 75* three!. Colorub) soroult3 Phis (9"0, 1W 4444. Fit ! oral 104.Mq? URBAN LOCAL. fie.._' .'unl} !).7;.1er K 11rnn:nkantp FIGURE NO. 6 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 114 Figure 2-7 Urban Collector • 80' R.O.W. Varies 1 t 36' 22' Buffer Shoulder Compacted Subgrade Shoulder �. _. _ ....._�a�_--—�---tea -il• ailall—,It' iii x11---11.�11;..11�...11:.. -u1 11--11-11�-1i--�. t ABC (Class 5) •IIMA— • ABC (Class 6) INTERIM TYPICAL CROSS SECTION Mrk0% Buffer `,. air 1,. NOT TO SCALE Sidewalk Curti Buffer �• Shoulder; Multi -Use awe i ' ABC (Clack to t Travel Lane `L 'Erase! Lane • HMA painadi 1a • x' 1e Shoulder Multi -Use •• �sMeallia•..agira. . . H=Han e (•.Hrtpuctcd Subgradc ULTIMATE TYPICAL CROSS SECTION 5' Minimum Sidewalks as Required by Public Works Sidewalk, Curb Buffer SS Notes; 1. • The allowable class and thickness of I lot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated 3. All sideslopes shall be seeded and mulched. 4. Additional ROW may be required by Publit Works to meet site specific requirements. 5. Signing and stnping per approved plan Computer File Information {"n twc tktc 02:10 10 lmtul% KH l .ist Naha ;ab n l?,dr 01 04 12 mots'. KI WELD COUNTY PUBLIC WORKS DEPARTMENT Fill Pro T PBSCAdmm Prupn'alk Welds: Dr" roar Fie Sant \ficn-utn,e 1:s XM Sus N T S. 1 nib l.ngli•h 1111 H Street Past Office Bas 75% ‘ "``d Greeley. Cdaratlu MMf?-071 Retried Phase. 44701 04.6$% In 0711► y)4 -Mr Kcn'c! URBAN C'OI .I .F.CT0R bore weld ('cunt) Milder K 11 mncnkamp IFIGURE NO. 7 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 115 Figure 2-8 Urban Arterial INS 140' R.O.W 51 i I 40' 1 24' 8' ll 52' Buffer Varies 16' - 22' 16' I ewa Curb/ Buffer we 10' Shoulder Shoulder/ Multi -Use 6' I 12' 12' Travel Lane1 Travel Lane * HMA 10/ I 10'. 6' Shoulder AS- a .- .i. s aafl . ar..0�r.^.ri.t. eaa -� ors.—ns'. 17as. ...-11.11 _II_,II--h11 •1Rlldll._ _1111-II-II.._II.-III-IIiiII-1!_ Illesse one ••— - ABC (Class 5) I Compacted Subgrade * HMA-- —* ABC (Class 6) INTERIM TYPICAL CROSS SECTION I 140' R.O.W. 1 24' 16' - 28' 24' 12' 12' _ Travel Lane Travel Lane Raised Median I r ..c � sue+.♦�..� 4,s.v' Fool_ _ _ _ _ _ _ _ _ _ _ �'.1i Sri f =II=iI I=I1= R=ll=`III=11=II�If=R=Ti 11 Rc° n fl u R n �t a it 11 IITr er 11 rt 1111 a n tt 1f u n J-1l=l1=11_I1�11�Q=Tf-� kn= 1x11# 1=11cIf=1I t .. 444, rave Lane Travel Lane * HMI Buffer 16' Shoulder/ Multi -Use NOT TO SCALE * ABC (Class 6) ULTIMATE TYPICAL CROSS SECTION 10' Minimum Sidewalks as Required by Public Works 16'-22' M Sidewalks' Curb/ Buffer ia' _ SS MK Compacted Subgrade Notes: 1. * The allowable class and thickness of Hot Mix Asphalt (HMA) and Aggregate Base Course (ABC) shall be determined by the guidelines described in the Pavement Design Chapter. 2. The foreslopes and backslopes shall be no steeper than 4:1 with a preference of 6:1 or flatter where it can be accommodated. 3. All sidestopes shall be seeded and mulched. 4. Additional ROW may be required by Public Works to meet site specific requirements. 5. Signing and striping per approved plan. Computer File Information Creation Late: 02:1a:10 initials Kit Last Modification Date: 01 44112 Initials: Kl I WELD COUNTY PUBLIC WORKS DEPARTMENT Full Path T:'PBSC'Admrn't1'roposals'.Wcldc thaw mg File Name: Microstruua Ver. XM Scale N T.S. Units English 1111 H Sercrt•Post o1Cxx Box 7t$ enmity, Colorado 80632-0758 Phone 1970) 304-6496 Fax. (970) 304-647 APpro' cd: Rniscd: Rnvucd: URBAN ARTERIAL ikuprcr: Wield County Dcthlcr: K. Hinnenlump FIGURE NO. 8 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 116 CHAPTER 3 SURVEYING 3.1 SURVEY DATA - REQUIRE A SURVEY CONTROL SHEET The required horizontal datum for surveying in Weld County is North American Datum of 1983, NAD-83. The required vertical datum is North American Vertical Datum of 1988, NAVD-88. 3.2 STATE PLANE It is required that survey control be tied into a National Geodetic Survey (NGS) monument for state plane conversion. Please refer to the NGS website for monument information and location. 3.3 MONUMENT BOXES Monument boxes are available at no charge for surveyors with valid permits who are upgrading aliquot corners on paved Weld County Roads or placing monumentation for aliquot corners on new paved Weld County Roads. Please contact Public Works in advance at (970) 400-3750. 3.4 ROAD SAFETY Appropriate traffic control devices and safety equipment are required when surveying within the County right-of-way. For the safety of the traveling public, monument box covers must be replaced, or the holes created must be backfilled. To minimize damage to the asphalt, concrete collars will be required around newly installed monument boxes. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PACTF 17 CHAPTER 4 ROADWAY DESIGN CRITERIA 4.1 GENERAL 4.1.1 Policy on the Use of Referenced Publications This chapter summarizes and/or supplements standards that have been prepared by AASHTO. The County expects and recommends that transportation designers reference the most recent edition of AASHTO's A Policy on Geometric Design of Highways and Streets as a primary guide when designing roadways in the County. Designers also are expected to reference CDOT design manuals. However, AASHTO and CDOT policies represent nationwide and statewide standards, respectively, which do not always satisfy County conditions. When standards differ, the instructions and guidance in this manual will govern. For the design of auxiliary turn lanes, please see Chapter 8 of this document. All traffic control devices and road stripiig will be in accordance with the latest version of the MUTCD or as shown in the latest version of CDCT's M&S Standard Plans. 4.1.2 Typical Plan Set Guidelines Typical plan sets should include enough detail and documentation to allow successful construction of the proposed transportation improvements. Plan sets found to be incomplete, or of insufficient quality to be easily readable by the reviewer(s), will be rejected by the Public Works Department. Plan sets will be produced on 11 -inch x 17 -inch paper and may be submitted electronically. All plan sets will be prepared by or under the direct supervision of a Professional Engineer licensed in the state of Colorado. Each sheet will be stamped and signed by the Professional Engineer of record. The following elements also must be included: • Cover Sheet. Must include a vicinity map with scale and north arrow, an index of sheets, design data, the phone number and address of the company and/or engineer responsible for the drawings, a utility contact list with phone numbers and email addresses, the Utility Notification Center Colorado (UNCC) phone number (811), the project title, and the date printed. • M&S Standards Sheet. Must show which M&S standards from the most recent CDOT M&S Stanaara Plans are applicable to the project. • Typical Section Sheet(s). Must include functional classification of the roadway, rural or urban classification of the roadway, right-of-way width, lane and shoulder widths, road centerline (crown; ocation, typical cross -slope, and pavement structural section elements and thicknesses. • General Notes. Must include all notes that are applicable to the construction of the project. May also include notes on pavement design, Best Management Practice (BMP) design, etc. • Summary of Approximate Quantities and Earthwork Quantities Sheet(s). Must include tables showing the bid tabulation quantities and breakdowns of all quantities by location. • Survey Control Sheet(s). Must include the basis of elevation control, basis of bearings, and project coordinates datum. • Right -of -Way Plan Sheet(s). Must be included when temporary or permanent easements are needed, or right-of-way will be acquired. Must include scale and north arrow, existing right-of- way lines, parcel lines and data, ownership information, proposed easement or right-of-way lines, arm existing and proposed improvements. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 118 • Utility Plans Sheet(s). Provide existing (SUE) and proposed utility relocations. Both plan sets must include scale and north arrow, utility ownerships, utility locations, utility conflicts. The SUE sheets shall provide the appropriate level of mapping meeting Colorado state legislative subsurface utility engineering (SUE) requirements. County requires Quality Level B or better for all utility impacts. The utility plan should also show the location of where utilities are proposed to relocate. • Demolition and Removal Sheet(s). Must show existing conditions and include all items that are to be removed or demolished by the contractor as part of the project. • Plan and Profile Sheet(s). Must include horizontal and vertical scales and north arrow, location of right-of-way, location of easements, location of property lines, location of utilities, centerline stationing, horizontal and vertical curve information, existing and finished road grades, and design elevations. Separate plan and profiles sheets will be included for each access point, irrigation structures, and other structures as applicable. • Intersection Detail Sheet(s). Must include roadway centerline with stationing, north arrow, horizontal scale (1 inch = 20 feet preferred), proposed and existing contours (1 foot minimum), grade flow arrows, location of right-of-way, curb type label (if applicable), and critical spot elevations. • Grading and Erosion Control Sheet(s). Must include existing and final elevation contours at a minimum one -foot contour interval, spot elevations at critical drainage points to facilitate review and construction, slope/flow arrows and labels, limits of construction disturbance, and location of permanent erosion control features. If the project requires a Stormwater Permit per the National Pollutant Discharge Elimination System (NPDES), a detailed stormwater management plan (SWMP) and landscaping/vegetation plan will be required. (Additional information can be found in Chapter 6 of this document.) • Drainage Sheet(s). Must include location and type of all drainage features (e.g., pipes, ditches, inlets, manholes), details for pond spillways and outlet structures, plan and profile views of all pipes and culverts (unless new pipes or culverts are replacing existing ones of the same size and at the same location), location of all existing utilities, utility potholing, identification of utilities that conflict with new drainage features, and construction details. Labeling is required for any pond water surface elevations (WSEL), volumes, water quality capture volumes (WQCV), and elevations. Drainage sheets must correspond to the accepted drainage report. • Signage and Striping Plan Sheet(s). Must include driving lane and shoulder widths; stationing locations for striping beginnings, endings, and changes; color and size of striping; striping material type; stationing location for signs; type and size of signs; and quantities tabulation tables • Landscaping Plan Sheet(s). Must include all areas that are to be seeded and/or landscaped. If trees are to be replaced, they must be shown on this plan subset. • Phasing Plan Sheet(s). If the project is to be phased, the phasing plans must be included. • Construction Traffic Control Plan Sheet(s). Must include plan view of all existing roads within the limits of the detour or within one mile of the project, whichever is larger; type and size of signs or other traffic control features; locations for all traffic control features; and quantities tabulation table. These sheets also must show any anticipated detour routes for road closures during construction. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u L 119 • Cross Section Sheet(s). Cross sections on 50 -foot interval must include depiction of existing and final ground elevations, location of existing and proposed right-of-way and easement lines, utilities, station labeling, and roadway centerline location. • Stormwater Management Plan. Must determine whether site is located in a Municipal Separate Storm Sewer System (MS4) area and must be included for temporary and permanent control measures. See Chapter 6 of this document for more information. These guide ines are not intended to replace specific guidelines related to preparation and submission of plat maps and property description maps prepared by a licensed professional surveyor. These guidelines alsc are not inclusive of all the specific items that may be required by the Weld County Public Works, Planning or Building Departments. There may be additional requirements for more complex projects, such as bridge replacement and County Highway projects. Table 4-1 be ow summarizes the roadway design criteria that can be found in this document for each roadway classif cation. For additional details refer to the sections below that discuss each topic. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 20 Table 4-1 Roadway Design Criteria Design Element Arterial Collector Local Design Speed Within Subdivisions 60 mph 50 mph 40 mph Outside Subdivisions See Note 1 Posted Speed Within Subdivisions 50 mph 40 mph 30 mph Outside Subdivisions See Note 1 Design Vehicle WB-67 WB-67 WB-67 Maximum Superelevation Rural 6% 6% 6% Urban 4% 4% 4% Minimum Length Required Tangent Between Curves in Addition to Superelevation Transition 100 ft 100 ft 50 ft Minimum Intersection Tangent (Measured from Pavement Edge) (See Note 2) 200 ft 150 ft 100 ft Minimum Centerline Radius See Note 3 Minimum K Value for Vertical Curves See Note 4 Minimum Stopping Sight Distance See Note 4 Minimum Centerline Grade on Road with Curb and Gutter 0.40% 0.40% 0.40% Maximum Centerline Grade 5% 6% I 8% Maximum Vertical Grade Change Not Requiring a Vertical Curve ≤0.2% ≤0.2% 50.2% Minimum length for Vertical Curves Preferred: 300 ft 300 ft 300 ft Allowed (3 x Design Speed): 180 ft 150 ft 120 ft Notes: 1. See Section 4.1.3 to determine an appropriate design speed and posted speed limit. Enforceable speed limit for roads without a posted speed limit is 55 mph. 2. See Figure 4-2. 3. See AASHTO's A Policy on Geometric Design of Highways and Streets superelevation tables for minimum radii based on design speed and maximum superelevation. 4. See Table 4-2 for minimum stopping sight distance and K values for vertical curves. 4.1.3 Design Speed Weld County requires designers to use a design speed that is 10 miles per hour (mph) above the required posted speed limit. Any change to the existing posted speed limit on a County road requires review by the Public Works Department and approval by the BOCC. To determine an appropriate speed limit, traffic investigations should consider the following factors applicable to the portion of road being studied: • Vehicle speed data (85th percentile) • Crash history • Hazardous locations (curves, sight distance, etc.) • Parking practices WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G h j 21 • Roadside development • Road :haracteristics The enforceable speed limit on roads within the County (not including roads within a subdivision) is 55 mph unless posted otherwise or within business districts, residential areas, or other areas where special conditions recuire a lower speed limit. Section 42-4-1102 of the Colorado Revised Statutes requires that speed limits npt be higher or lower than the basic prima facie (reasonable and prudent under normal conditions) speed limit unless a traffic investigation has justified the change. Posted speed imits for roads within subdivisions shall be as follows: • 50 mph for arterial roads; • 40 mph for collector roads; • 30 — 40 mph for local commercial/industrial uses; and • 25 — 3D mph for local residential uses. 4.2 HORIZONTAL ALIGNMENT 4.2.1 Horizontal Curves Horizontal alignment of the roadway is critical for safe and economical operation of motor vehicles traveling the roadway at the design speed. Horizontal curve design should be based on an appropriate relationship between design speed, right-of-way, profile grades, and construction costs —and on their joint relationships with superelevation and side friction. Curves are not required when the deflection angle (A) (total ventral angle of the circular curve) is less than 1 degree. Curves should be at least 500 feet long hr a deflection angle of 5 degrees, and the minimum length should be increased 100 feet for each 1 degree increase in the deflection angle. Figure 4-1 illustrates a simple horizontal curve. Figure 4-1 Horizontal Curve Point of Intersection (PI) A Tangent Point of Curvature (PC) 1Extrrnal Dhtancc (E1 length of Curve (L) Simple Curve Deflection Angle (A) Point of Tangency (PT) • I r The formulas car be found in AASHTO's A Policy on Geometric Design of Highways and Streets and CDOT's M&S Standard Plans. Minimum radius values may also be taken from the AASHTO superelevation tables, using the "NC" (normal crown) line item. For rural areas, use the AASHTO table for minimum radii normal crown rates with emax = 6 percent. For urban areas, use the AASHTO table for minimum radii or normal crown rates with emax = 4 percent. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 122 Designers should use every effort to exceed the minimum curve radius recommended by AASHTO when practical. Simple curves should be used for all roadways. Broken back, compound, or reverse curves are not recommended. The tangent between curves should be sufficient to accomplish the superelevation transitions required for adjacent curves. An additional 50 feet to 100 feet of tangent length, graded as a normal crown, should be provided between the end of the transition out of one curve and the beginning transition into the next for ease of driving. Minimum intersection tangents (measured from the pavement edge of the intersected road at intersections) shall be as follows: 200 feet for arterial roadways; 150 feet for collector roadways; and 100 feet for local roadways as illustrated in Figure 4-2. Figure 4-2 Minimum Tangent from Intersection MINIMUM TANGENT FROM INTERSECTION WELD COUNTY ROAD EDGE OF PAVEMENT POINT OF CURVATURE (PC) 4.2.2 Superelevation Proper design of horizontal curves often requires the use of superelevation (roadway banking). Factors controlling the use of superelevation include climate conditions, terrain conditions, classification of the road, and the frequency of slow -moving vehicles on the roadway. In general, a lower rate of superelevation is used in urban areas than in rural areas. For rural areas, use the AASHTO table for minimum radii for design superelevation rates with emax = 6 percent. For urban areas, use the AASHTO table for minimum radii for design superelevation rates with emax = 4 percent. If possible, superelevation rates of 4 percent or less should be used in roadway designs. 4.2.3 Transitions The superelevation transition section consists of the superelevation runoff and tangent runout sections. The superelevation runoff is the length of roadway needed to accomplish a change in outside lane cross slope from zero to full superelevation, or vice versa. The tangent runout section is the length of roadway needed to accomplish a change in outside lane cross slope from normal cross slope rate to zero, or vice versa. Additional information pertaining to the lengths and use of transitions for simple and spiral curves can be found in AASHTO's A Policy on Geometric Design of Highways and Streets and CDOT's M&S Standard Plans. The design should allow for 60 percent of the superelevation transition length to occur before the horizontal curve starts and after it ends. The remaining 40 percent of the transition occurs within the horizontal curve. This includes the lengths for all the transitions including normal crown, level crown, reverse crown and full superelevation. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 23 4.2.4 Cross Slope Cross slope is lecessary to ensure adequate roadway drainage. The paved typical cross sections (described in Chapter 2 of this document) all show a cross slope of 2 percent, and this is the County's preferred value for a paved roadway. Non -paved roadways should have a cross slope closer to 3 to 4 percent to help accommodate surface drainage. Undivided roads should have a normal crown that is a two-way cross slope, with the high point of the cross section located on the road centerline. Divided roads should have a cross slope on each side of the divide, with the high point of each section located where the pavement meets the median. Unusual conditions and transition areas may cause the 2 -percent cross slope requirement to vary. Cross slopes varyirg from a minimum of 1 percent to a maximum of 4 percent may be allowed depending upon surface t ape. Intersections of roads with curbs and gutters sometimes require the use of crosspans for drainage. At these areas, the normal two-way 2 -percent cross slope will transition to a one-way slope adjacent to the cross pan, with a slope range of 1 percent to 3 percent. For intersections not requiring cross pans, see Figure 4-3 for the desired cross slope configuration. Figure 4-3 Intersection Cross Slope Detail UNCONTROLLED INTERSECTION • sere +-eateasendo.-I Maintain positive drainage from centerpoint of intersection to all quadrants. Eliminate crown from all directions approaching the intersection. CON7 ROLLED INTERSECTION L,• lI3 •r• + 001\011:;C:te:let----S 11 1 fist ;pit sls.;:: fF--- :4u \ I4Iq ---.,r "eons _.__.._."-.....J, Through road retains crown; side roads with stop/yield signs are shaped to match the edge of through road. The rate of charge for cross slope in an area of transition, should not exceed 1.5 inches over a 50 -foot horizontal distance. This rate helps to ensure ride quality for the traveling public. 4.3 VERTICAL ALIGNMENT Weld County's -cpography generally is flat with gentle slopes, but some areas have steep drainage basins and ro his- hills. When designing roadway vertical alignment, designers must consider stopping sight distance requirements for the given speed limit and the challenges of large cut -and -fill sections. Vertical curves are classified as either sag or crest curves. Typically, sag curves are controlled by nighttime drivirg conditions with headlight visibility restrictions, and crest curves are controlled by stopping sight cistances. Vertical curves should be simple in application and should result in a design that is safe and comfortable in operation, aesthetically pleasing, and adequate for drainage especially when a curb ani gutter are used. 4.3.1 Maximum and Minimum Grades Grade lines typi:ally are controlled by topography and structure clearances, but very flat grade can be controlled by drainage considerations. Other factors that should be considered are road classifications, design speed, safety, and construction costs. WELD COUNT ENGINEERING & CONSTRUCTION CRITERIA PAGE 24 A minimum grade value of 0.4 percent is preferred for road sections with curbs and gutters. In certain conditions, a grade as low as 0.3 percent may be used with approval of the Department of Public Works. The designer must consider the ultimate design of the roadway, however, recognizing if a curb and gutter may be required in the future, and then design for those conditions during the interim design. Maximum allowable grades are as identified in Table 4-1 above; 5 percent on arterials, 6 percent on collectors, and 8 percent on local roads. Grades of 4 percent or steeper will require special consideration for drainage or erosion protection. When using combinations of horizontal and vertical curves, it is important to recognize the driver's perspective. Sharp horizontal curvature should not be introduced at or near the top of a pronounced crest vertical curve. If unavoidable, the horizontal curve should be made longer than the vertical curve to help minimize the driver's inability to perceive the horizontal change, especially at night. For further details, see AASHTO's A Policy on Geometric Design of Highways and Streets and CDOT's Roadway Design Guide. The length of vertical curves can be determined by dividing the rate of vertical curvature by the grade change or algebraic difference in intersecting grades (%). L (Length)(ft) = K (rate of curvature) / A (grade change)(%) A vertical curve is not required when a grade change or the algebraic difference is ≤ 0.2 percent. The Weld County preferred minimum length of a vertical curve is 300 feet. The allowed minimum is three times the roadway design speed. 4.4 SIGHT DISTANCE At intersections, accesses, and points along County roadways, sight distance is essential to protect the traveling public. In evaluating the overall performance of a roadway, there are several sight distances to consider when designing a roadway. When items such as walls, buildings, bridge piers, cut slopes, or vegetation growth are near the roadway on the inside of a curve, they can block a driver's view of the road ahead. If they are too close, the driver will not have sufficient distance along the curved roadway to stop when a hazardous condition comes into view. Sight distance related to accesses is discussed in Chapter 8 of this document. 4.4.1 Stopping Sight Distance Stopping sight distance is the length of roadway it takes for a driver to bring a vehicle to a complete stop. Stopping sight distance is measured from the driver's point of view, which, according to AASHTO's A Policy on Geometric Design of Highways and Streets, is 3.5 feet above the road surface, to an object's height of 2 feet within the roadway. Stopping sight distance includes the reaction time of the driver and braking distance of the vehicle, as well as roadway grades (see Table 4-2). Additional information regarding reaction time and braking distance can be found in AASHTO's A Policy on Geometric Design of Highways and Streets and in Chapter 8 of this document. As shown in Table 4-2, stopping sight distance varies depending on the percent in grade up or down within the vertical curve. The designer should account for the varying grades within his or her profile design and select the appropriate values of stopping sight distance. Table 4-2 lists stopping and passing sight distances for various percent grades up or down. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r' A u G 25 Table 4-2 Stopping and Passing Sight Distances and K Values Design Speed (mph) Stopping Sight Distance (feet) Passing Sight Distance No Grade % Down Grade % Up Grade Crest Sag Crest Curve (C) 3 6 9 3 6 9 K K (feet) K 25 155 158 165 173 147 143 140 12 26 450 72 30 2C0 205 215 227 200 184 179 19 37 500 89 35 250 257 271 287 237 229 222 29 49 550 108 40 30S 315 333 354 289 278 269 44 64 600 129 45 360 378 400 427 344 331 320 61 79 700 175 50 425 446 474 507 405 388 375 84 96 800 229 55 495 520 553 593 469 450 433 114 115 900 289 60 570 598 638 686 538 515 495 151 136 1,000 357 65 645 682 728 785 612 584 561 193 157 1,100 432 For horizontal carves (see Figure 4-4), the sight line is measured along the chord of the curve, while the stopping sight distance is measured along the centerline of the inside lane around the curve. Figure 4-4 Horizontal Sight Distance Sight Distance 1 Highway Cl 1:4371eCL ••• Line Line of Sight a HSO n Imam Sight Obstruction `. asiersE ~ 1 HSO = R(1 -cos (28.65S/R)) or S = R/28.65 acos ((R-HSO)/R) HSO - Horizontal Sightline Offset S a Stopping Sight Distance R = Radius of lane centerline Horizontal sight distance may be restricted by obstacles along the roadway or even by cut slopes through a hillsice. Other normal roadside objects, such as guardrail, concrete barriers, and privacy fences, should he studied for interference with sight distance. WELD COUNT\ ENGINEERING & CONSTRUCTION CRITERIA PAGF 126 Vertical sight distance is determined by the geometrics of the curve. Figure 4-5 is an example of the crest vertical curve. Figure 4-5 Crest Vertical Curve sight Distance (S) 2 f 3.5 ft rTh Length of Curve (1) Sag vertical curves usually are controlled by headlight distance. Under certain conditions, the minimum stopping sight distance values used for design exceed the length of visible roadway. This is because of the limitations of vehicle headlights, especially low -beam headlights. Formulas to determine stopping sight distance on both crest and sag curves can be found in AASHTO's A Policy on Geometric Design of Highways and Streets. 4.4.2 Passing Sight Distance Passing sight distance is the length of roadway required for the driver of a vehicle to pass another vehicle safely and comfortably, without interfering with the speed of an oncoming vehicle traveling at the design speed if it came into view after the passing maneuver was started. Passing sight distance is measured from the driver's point of view, which is to be measured at 3.5 feet above the road surface, to an object's height of 3.5 feet. Typically, passing sight distance will be limited on crest vertical hills. A significant amount of cut may be required to achieve adequate passing sight distance. Table 4-2 lists appropriate passing sight distances for various speeds. 4.4.3 Decision Sight Distance The stopping sight distances shown in Table 4-2 are distances for reasonable and alert drivers to come to a complete stop. They do not include the time it takes drivers to make a decision when unexpected or unusual maneuvers are required. Decision sight distances (see Table 4-3) are substantially greater than stopping sight distances. Locations where these kinds of decisions are required include interchanges, cluttered or confusing intersections, and short lane drops. (See AASHTO A Policy on Geometric Design of Highways and Streets for more information.) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PA G i 27 Table 4-3 Decision Sight Distance Decision Sight Distance Design Speed (mph) Decision Sight Distance for Avoidance Maneuver (ft) A B C D E 30 or less 220 490 450 535 620 40 330 690 600 715 825 50 465 910 750 890 1,030 60 610 1,150 990 1,125 1,280 70 780 1,410 1,105 1,275 1,445 Where: Avoidance Maneu per A = stop on rural road (t = 3.0 seconds) Avoidance Maneuver B = stop on urban road (t = 9.1 seconds) Avoidance Maneu ✓er C = speed/path/direction change on rural road (t = 10.2 sec to 11.2 sec) Avoidance Maneu per D = speed/path/direction change on suburban road (t = 12.1 sec to 12.9 sec) Avoidance Maneu per E = speed/path/direction change on urban road (t = 14.0 sec to 14.5 sec) 4.4.4 Intersection Sight Distance There are numerous intersections within Weld County; most are controlled, but some are uncontrolled, which means there is no signing in either direction. Ideally, intersections would have adequate sight distance in all cirections and along approaches to allow drivers to see obstructions or approaching vehicles. However, many of the County intersections do not have unobstructed views for various reasons. Utility appurtenances, embankments, vegetation, and privacy fences are just a few examples of sight restrictions. In these circumstances, and where no traffic control devices are present, the basic rule of the road is the vehicle on the left is to yield to the vehicle on the right if they arrive at about the same time. If drivers : annot see due to sight obstructions at the intersection, it is the responsibility of every driver to slow Gown and determine if it is safe to continue through the intersection. Additional information regarding intersection sight distance can be found in AASHTO's A Policy on Geometric Design of Highways and Streets. The recommended dimensions of the sight triangles vary with the type of control used at the intersection because different types of control impose different constraints on drivers and, therefore, result in differert behavior. AASHTO's A Policy on Geometric Design of Highways and Streets presents procedures to determined sight distances at intersections for the following types of traffic control: 1. Intersections with no control 2. Intersections with stop control on the minor road 3. Intersections with yield control on the minor road 4. Intersections with traffic signal control 5. Intersections with all -way stop control 6. Left t.arrs from the major road 7. Roundabouts Figure 4-6 below, illustrates an intersection with stop control on the minor road. For information regarding the variable definitions and equations used to calculate these distances, see Section 8.6.2 of this document ar d AASHTO's A Policy on Geometric Design of Highways and Streets. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 128 Figure 4-6 Departure Sight Triangles at Intersection (Stop Control) Clear Sight Triangle Decision Point 0 cr 0 S 2 Major Road al co 0 cc 0 c Major Road T a2 is Ls _ b • ` Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic Departure Sight Triangle for Viewing Traffic Approaching the Minor Road from the Left Approaching the Minor Road from the Right Private accesses need to take into consideration these sight distance requirements just as other roadways would. More information regarding access sight distance can be found in Chapter 8 of this document. 4.5 INTERSECTIONS By definition, an intersection is the location where two or more roadways meet or join together. This occurs at at -grade crossings, interchanges, or grade separations without ramps. All of the County -owned intersections in Weld County are at -grade intersections. Generally, there is more potential for conflict at intersections than on straight sections of roadway, so intersections usually have higher accident rates. Chapter 9 of AASHTO's A Policy on Geometric Design of Highways and Streets discusses intersections and provides guidance on design details. Designers also should refer to CDOT's Roadway Design Guide. The sections below highlight a few key aspects of intersection design. See also Chapter 2 of this document for typical cross-section drawings. 4.5.1 Alignment and Profile It is very important for the success and safety of any intersection that it is aligned with the intersecting roadway. For standard, at -grade, four-way intersections and T -intersections, the roadways should meet as close to perpendicular as possible. Skewed intersections are difficult for drivers and create unsafe conditions. The required angle between centerlines of the intersecting roadways is 90 degrees, as shown in Figure 4-7. Any deviations from 90 degrees will need to be approved by the Department of Public Works. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA I 29 Figure 4-7 Typical Intersections I i 90 Degrees C 3 Rdwy CL r — T 90 Degrees 90 Degrees Rdwy CL Four -Way Intersection T Intersection The alignments and grades of the intersecting roadways should permit the maneuvers needed for cars to pass through the intersection with minimal interference. Alignments should be as straight and flat as practical, and substantial grade changes should be avoided. All lanes shall be in general alignment through each intersection; however, a maximum 2 -foot shift is allowed across al intersection without a variance approval by the County Engineer. The profile grade lines should be adjusted back a distance from the intersection to provide a smooth transition. It mac be desirable to remove the cross slopes coming into the intersection, as steep cross slopes or grade changes create an undesirable bump at the intersection and may require reconstruction to correct. Refer back to Figure 4-3 for an intersection cross slope detail. A smooth transition is particularly impertant at intersections where drivers do not reduce their speed or come to a stop. Designers should remember that intersections which are currently stop -controlled may not be stop - controlled in the future. 4.5.2 Corner Radii Corner radii are another critical aspect of intersection design. Corner radii are selected based on the turning radii of different design vehicles. Chapter 2 of AASHTO's A Policy on Geometric Design of Highways and Streets discusses design vehicles and their different turning radii. The four classes of design vehicles are: passenger cars, buses, trucks, and recreational vehicles. The Weld County design vehicle is the WB-67 truck. 4.5.3 Approval Requirements Chapter 9 of AASHTO's A Policy on Geometric Design of Highways and Streets summarizes the minimum edge of traveled way design for the four classes of design vehicles. Usually, the simplest curves to construct are the simple curve with taper and the three -centered compound (symmetric) radii. Other compound curves can be difficult to implement in the field. For intersections on arterial and collector roadways, desigrers should consider a minimum radius of 65 feet, following a simple curve with taper WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 130 radii. This allows larger trucks to make right turns without the rear tires going off the road and without veering into opposing vehicle paths. An exhibit from AutoTURN software or equivalent roadway design turning template software must be provided to the County to demonstrate the corner radius is appropriate. 4.5.4 Auxiliary Lanes See Chapter 8 of this document for information on auxiliary lanes. 4.6 CUL-DE-SACS Cul-de-sacs and dead-end roadways are not common in the County but are sometimes found in subdivision and residential areas. Cul-de-sacs should be designed with a radius large enough to allow a standard fire truck to use the cul-de-sac to make a u -turn without having to back up. The minimum outside curb or pavement edge radius allowed for a cul-de-sac is 55 feet. The minimum right-of-way turnaround radius is 65 feet. The maximum cul-de-sac length between intersecting streets (from centerline to centerline) is 1,500 feet. No more than 20 lots may be served by a permanent cul-de-sac. The most common design is a circular cul-de-sac with or without a center island. Chapter 5 of A Policy on Geometric Design of Highways and Streets offers additional design criteria and other types of cul-de- sacs. The designer must consult the relevant fire protection authority for its minimum criteria as well. 43 BRIDGES This section is not intended to cover bridge design in detail. It covers only general guidelines. More detailed bridge design information can be found in the latest editions of AASHTO's LRFD Bridge Design Specifications, the Culverts and Bridges chapter in the USDCM, Volume 2, and CDOT's Drainage Design Manual and Bridge Design Manual, as updated. 4.7.1 Bridge Hydraulic Capacity During preliminary design, the designer shall complete a hydrologic and hydraulic analysis of the waterway to correctly size the opening of a new bridge, coordinating with owners as necessary. Bridges over canals require less hydrologic analysis than bridges over natural drainage ways. Designers shall gather and analyze background information, such as past inspection reports, measurable high-water marks, past maintenance issues, scour, and flood records. The storm design frequency for the different types of roadways and drainage types is shown in Table 4-4. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA IJ A U E 31 Table 4-4 Design Frequencies Drainage Type I Design Frequency Multi -Lane Roads Urban area 100 -year Rural area 100 -year Two -Lane Roads Urban area 100 -year Rural area Q5o > 4000 Q5o < 4000 cfs cfs 50 -year 25 -year Drai 'age Type Design Frequency Bridge foundation scour Q25 requires scour design O50 and scour 0200 Check design Based Q5oo Flood and Check on Q1oo Qloo Qdes;gn Flood Check requires if: Flood O200 050 requires scour design Q cc and In areas that cc ntain the FEMA mapped 100 -year floodplain, designers shall use the 100 -year discharge in their designs. If a bridge is being constructed in a 100 -year floodplain, all applicable floodplain regulations anc codes apply, including the need to submit a Letter of Map Revision (LOMB) to FEMA for review and acc wtance and the need to obtain a Floodplain Hazard Permit from the County. On wide floodplains, structure loss can be prevented by lowering approach embankments to provide overflow secticns that pass unusual floods over the roadway. This may require relief structures to be constructed to a low minor flooding without upstream ponding. Factors such as traffic delays and alternative rou-es should be considered. Additional and retailed information can be found in CDOT's Drainage Design Manual and CDOT's Bridge Design Manual 4.7.2 Freeboard A minimum cle 3rance, or freeboard, shall be provided between the water surface elevation and the low girder of the br dge. The freeboard is required to allow for wave action, ice, debris, and uncertainty during estimati Dn. The minimum freeboard for a bridge should follow these guidelines: • For a hci-debris stream, freeboard should be 4 feet or more. A "high -debris" stream designation often will be site -specific and shall be determined through consultation with Public Works officials and local landowners, as well as through a thorough investigation of the debris potential in the watershed. • For low- to moderate -debris streams, the minimum freeboard will be 2 feet. The water surface elevation at a distance of 50 feet to 100 feet upstream of the face of the bridge will be the elevation to which the freeboard is added to get the low girder elevation of the bridge as a rough estimate of ma: imum backwater. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 132 4.7.3 Bridge Scour Increased flow velocities at bridge constrictions often lead to scour of the bridge foundations, which can cause the potential for collapse of the structure. Localized bridge scour is comprised of contraction scour and local scour at piers and abutments. These three components are added together to create the final scour envelope. Methodologies for estimating scour at bridges can be found in the following FHWA guidelines: • FHWA, Evaluating Scour at Bridges, Hydraulic Engineering Circular No. 18 (HEC-18), latest edition • FHWA, Stream Stability at Highway Structures, Hydraulic Engineering Circular No. 20 (HEC-20), latest edition Methodologies for designing scour countermeasures at bridges, piers, and abutments can be found in FHWA's Bridge Scour and Stream Instability Countermeasures: Experience, Selection, and Design Guidance, Hydraulic Engineering Circular No. 23 (HEC-23), latest edition. 4.7.4 Use of HEC-RAS It is acceptable to use the U.S. Army Corps of Engineers (USACE) Hydrologic Engineering Center's River Analysis System (HEC-RAS) to determine the hydraulic characteristics at bridges. Standard modeling practices accepted by FEMA should be used when performing HEC-RAS modeling. It is not acceptable to rely on HEC-RAS output for estimating maximum velocities for erosive or hazardous considerations or local scour in a channel. A more -detailed hydraulic analysis of the specific cross section, accounting for variable velocities across the channel, is necessary. 4.7.5 Bridge Railing Bridge railing should be provided along bridge edges to protect both drivers and in applicable situations pedestrians. Weld County follows CDOT M&S Standards for bridge rail and guardrail design. CDOT's M&S Standard Plans, as well as the CDOT Bridge Structural Worksheets, identify several different railing options and configurations that the designer may consider. AASHTO's bridge design documents provide additional information as well. 4.7.6 Minimum Structural Requirements Design loadings for bridges shall comply with the latest editions of AASHTO's LRFD Bridge Design Specifications and CDOT's bridge design publications. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u t:, I 33 CHAPTER 5 DRAINAGE CRITERIA 5.1 GENERAL The intent of Weld County's storm drainage criteria WCECC is to protect the health, safety, general welfare, and economic well-being of the County and residents, while also protecting property and infrastructure. The drainage characteristics of Weld County vary greatly throughout the 4,000 square miles of the county. This chapter aims to provide greater detail on the expectations and guidance for drainage -relates portions of a project. Weld County has adopted the following master drainage plans: • South -25 Corridor Master Drainage Plan, also known as "Godding Hollow and Tri-Town Study" (adopted in 1999). The South 1-25 "Tri-Town" Master Drainage Plan from 1999 can be found on the City of Dacono's website. • Master Drainage Plan for the Area Surrounding Weld County Parkway (adopted in 2016). This Master Drainage Plan can be found on the County's Parkway webpage. A map of Weld County's drainage basins is shown in Figure 5-1. A full-sized version is provided in Appendix A. This manual refers to both the current and older, archived versions of Urban Drainage and Flood Control District (UDFCD; Urban Storm Drainage Criteria Manual (USDCM), Volumes 1 through 3. This manual will explicitly state when to use an older version of the USDCM. UDFCD has rebranded as of 2019 and is now referred to as the Mile High Flood District (MHFD). The MHFD acronym will be used exclusively throughout the chapter. It shall be noted that specifically to drainage, some of these references have provided updated values and equations n recent years that are in accordance with Full Spectrum detention pond design. Weld County does not support Full Spectrum design and, as such, when standards differ, the instructions and guidance in the following Drainage Chapter will govern. All Storm Drainage Guidance documents provided by the County can be found on the Weld County Planning and Zoning's Development Review webpage. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 134 Figure 5-1 Weld County Watersheds • .. Id �r f: - •►A nr� i% 77 T ly -t .. .1 a ?.. t :r -1 - ui / T { t 1 L 1•• ( N. 4 t\-\\15 ...4 f e .21 rite re we 111 I i i '•` - • ramp � -«I - •tom • � ' 1 �, �1 ' L- �. �. may. 1 • . ' — . - - • _ t j .. •1.3..ca: �. r c. . _ r I . :. IHi ,... t kill: I Ja ' 'r _ illimiI :iSia:iii!iiIi ti... I � t'rs o. '. • -- - f3i • ri [ " Weld County �"j ! L ice:r;'�rr ; '�''�' --t« "�' '� - , Drainage Basin Map s .t. • it • --may'bta; to IN 1 • t K• j t Us 'need N4. ., .1. 4. • wag cash 141116 Moos 4 Oil . . Irraan0 r P 1- it bk 1 • • • . , 7,, ell ass lie • 1•1•••• r. . . 14 • dis llimatli .. _. ,. . ___ • 1 r ti is!IiiJtIi / i . .7,• = 1 i = { :#. �•.frr a.. COLORADO • ea fable 1.4 Oa bory 11 . r IIII ` ' 'is N �1 At • / . vie.+.. s.a tt •- r :• ....."14.41,L li r ry 1•INIMIll -., t r \ +1/..1r{r I !a ' �N 4 ,-- -r s{ _...�.. .gip ear Agee i. can, 1 .41 see -V- A_ a a V' • riagrAffl ' • 9 S' 2 4 5�yy •' ___la - ass. mos taw va _ • 1 Ma a- r ■ s' fr r r -� •■w .� • - Tom- i.. - w •III"III". [[51 II . mile ' ' �•/� - • '� owe It 3 1• lam• :.._....... Sr .. .—LYM••••••.s.-f•••1W— c-r�•s -.a-r.r•..S •, wr �•�•r••.w�••�• w• • s .. .ay a asses ra ♦r•.: —.. ••r •• N.X Ith ,rr �� 4. ••a *tun=fait antam.t...�.. nr•Y Si VS les Val ~waft 5.2 DRAINAGE LAW Refer to the Drainage Law chapter of the USDCM, Volume 1, for more information on drainage law as it relates to stormwater runoff and floodplain management. 5.3 DRAINAGE POLICY The drainage policies set forth are intended to provide adequate stormwater management to preserve and promote the health, safety, general welfare, and economic well-being of the County. Weld County embraces the basic principles defined in the Drainage Policy chapter of the USDCM, Volume 1. 5.3.1 Submittal Requirements The Weld County Planning Services Department is the agency responsible for reviewing drainage in the development review process. The submittal requirements for each project (commercial and residential WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A v r. 35 developments, new roadways, new bridges, channel restorations, etc.) will differ based on the scope and location o: the improvements. The Drainage Report Checklist provided in Appendix B shall serve as a guideline for designers throughout the entire des Fn and construction process. The Drainage Report Checklist provides a framework of Weld County's -equirements for the drainage report, construction drawings, and operations and maintenance (D&M) plan. The designer shall include this checklist with the preliminary and final deliverables for the project. • The drainage report must fully document all assumptions and methodologies and shall contain copies cf all applicable tables and reference materials in an appendix. A drainage basin map shall be included showing basin delineations, flow arrows, design points, pond volumes, and any other nformation pertinent to the design. • Grading and drainage plans shall be submitted as a single PDF document, printable to scale on 11- inch x 17 -inch paper. • To ass st owners with maintenance, an Operations and Maintenance (O&M) plan for stormwater facilities and associated infrastructure shall be included with the final drainage report. The O&M plan should include instructions on safe and correct operations, repair and maintenance of all installec equipment and facilities, and recommended inspection schedules. The O&M plan to be distr buted to any applicable homeowners' association or business park association (or equiva ent). Weld County has adopted CDOT's guidelines for the O&M plan and is provided in Appendix C. • Electronic copies of drainage design spreadsheets, models, etc., may be requested for submittal to Weld County for reviewing purposes. AutoCAD base files (including site layout, roadways, utilit es, survey coordinate system information) shall be included with the project's final submittal for inclusion into the County's GIS mapping system. Electronic pdf copies of all calculations relevant to the design of the project shall be included in the drainage report append ces for review. • Each plan and report must be prepared by or under the supervision of a professional civil engineer licensed to practice in the State of Colorado. Plan sheets will contain the Engineer's seal; signed, dated, and sealed per State requirements. Electronic stamps are acceptable. • The report shall contain the Weld County Drainage Code Certificate of Compliance stating that the design meets all applicable drainage requirements set forth in this WCECC, with the exception of County -approved variances. The Certificate of Compliance is available on the DepartTent of Planning and Zoning's Development Review webpage. Design variance request information is to be included on the lower portion of the Certification of Compliance sheet. The consulting engineer should provide information supporting the variance request in the form of a drainage memo or letter. Any necessary engineering calculations or explanation should be providec in the submittal. • The cesigner/contractor is to provide an as -built survey, when requested, of the constructed stormwater facilities upon final completion of the project for acceptance by Weld County and issuance of any Certificate of Occupancy. An As -Built Drawing Checklist is included in Appendix D. The survey will be conducted, signed, dated, and sealed by a Professional Land Surveyor licensed to practice in the State of Colorado. At a minimum, the as -built drawings shall include: WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE I 36 1. Drawing showing design contours versus as -built contours of constructed pond/site (1 -foot contour intervals, labeled) 2. Spot elevations at critical drainage design points: • Pond outlet structure • Pond emergency spillway, start and end of riprap or other required protection • Pipe/inlet elevations • Structure inverts • Exposed groundwater elevation, if applicable 3. Pond design volume (stage -storage tables) versus as -built volumes. The designer/contractor shall submit a Statement of Compliance signed and stamped by a Colorado Professional Engineer that verifies in writing that the pond as -built volume meets the design volume requirements. 4. Drawings shall be properly scaled and sized to clearly show the work that was done through construction. The contractor shall provide signed and stamped Engineered copies of relevant plans and details with updates including the following, but not limited to, updated elevations, dimensions, and pipe sizes. 5. All appurtenances and related features shall be located horizontally and vertically by the surveyor. Due to a project's scope and/or location, special permits may be required. Such permits may include construction permits, floodplain permits, and environmental permits. Requirements for special permits are dictated by the approving department or agency. 5.3.2 Data Collection The County uses information and data provided by FEMA, the National Oceanic and Atmospheric Administration (NOAA), the U.S. Geological Survey (USGS), private consulting engineers, and the Colorado Water Conservation Board (CWCB). Before commencing design of any drainage project, designers should collect and evaluate data for the particular watershed area under consideration. Unless explicitly stated otherwise, Weld County will allow the use of data collection methodologies other than what is recommended in this WCECC on a case -by -case basis when complete documentation of all assumptions is provided. Weld County reserves the right to review alternatives and compare with other commonly used approaches, including those discussed in the USDCM. 5.4 RAINFALL The designer should use the most appropriate and best available data for the project area in determining the rainfall quantities. Local rainfall data shall be obtained from NOAA Atlas 14: Precipitation -Frequency Atlas of the United States, Volume 8 (Atlas 14) unless otherwise approved by the Department of Public Works, or unless otherwise specified in urbanized jurisdictions and existing master plans. The use of synthetic rainfall distribution data is not permitted. 5.4.1 Intensity Duration Curves for Rational Method To develop depth -duration curves or intensity -duration curves for the Rational Method of runoff analysis, the 1 -hour depth(s) obtained from NOAA Atlas 14 can be applied to Equation 5-1 below for the duration (or durations) of interest: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA FAUE 37 I Where: 28.5P1 (10+Td)0.786 • I= rainfall intensity (inches per hour) • P1= 1 -hour point rainfall depth (inches) • Ti= sta-m duration (minutes) Eq. 5.4.1 For more deta Is regarding the development of rainfall information, refer to the Rainfall chapter of the USDCM, Volume 1. 5.5 RUNOFF For more deta Is regarding the development of runoff information, refer to Chapter 8, Article XI, of the Weld County Code and the Runoff chapter of the USDCM, Volume 1. The County explicitly uses the 2007 version of the Rinoff chapter of USDCM, Volume 1 and, as such, it has been made available on the Weld County website. Depending on the size and location of a project, there are three allowable stormwater runoff calculat!cn methods. Table 5-1 below summarizes the allowable methodology. When designing a site with mu tide detention basins in parallel or series, the use of Stormwater Management Model (SWMM) is rec tired for routing. Weld County does not allow the use of CUHP. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 38 Table 5-1 Runoff Coefficient Equations for Weld County/2008 MHFD (HSG-a) Size of Basin Allowable Runoff Calculation Method Less than 5 acres Rational Method required 5 to 160 Acres Rational Method or SWMM allowable Greater than 160 acres SWMM is required 5.5.1 The Rational Method The Rational Method is a simplistic method for determining peak runoff from a proposed development or road construction project. It should not be used for basins greater than 160 acres. Refer to the Runoff chapter of the USDCM, Volume 1 provided on the County Website for more information regarding application of the Rational Method. The design engineer shall use the Rational Method to perform runoff calculations (for basin sizes under 160 acres). The spreadsheet used to perform runoff calculations, UD-Rationalv1.02, is available for download on the Department of Public Works Zoning's Development Review webpage. This spreadsheet utilizes the rational method "C -values" from the 2007 design manual (shown in Table 5-3 through Table 5-5 below). The design consultant may use the downloadable spreadsheets or may create their own based on the information provided in the following portion of this document. The created spreadsheets must use the older 2007 C -values to be accepted. A copy of these runoff coefficients are provided in Appendix E and on the Department of Planning and Zoning's Development Review webpage. The rational formula is as follows: Q=CxIxA Eq.5.5.1 Where: Q = peak runoff rate, cfs C = runoff coefficient, dimensionless I = rainfall intensity at the time of concentration, in/hr A = area of the basin, acres The runoff coefficient, C, represents the effects of infiltration, evaporation, retention, and interception and is calculated based on the soil type and impervious percentages. Higher impervious percentage values (roofs, parking lots) mean the area does not readily allow water to infiltrate into the ground, whereas lower impervious percentage values (parks, green space) mean the area does allow water to infiltrate into the ground. The recommended impervious percentage values, I, for Weld County are provided in Table 5-2, below. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u L 39 Table 5-2 Percentage Impervious Values for Weld County Land Use or Surface Characteristics Percent Impervious (%) Commercial 95 Residential: Single -Faro ly Greater than 2.5 acres or larger 12 Greater than 0.75 acre to 2.5 acres 20 Greater than 0.25 acre to 0.75 acre 30 0.25 acre or srre ler 45 Multi -Unit Detached 60 Multi -Unit Attached 75 Apartments 80 Industrial: Light 80 Heavy 90 Solar Facilities: A& B Soils 2 C & D Soils Site -specific Parks, Cemeteries 10 Playgrounds 25 Schools 55 Railroad Yard Areas 50 Roofs 90 Undeveloped Areas: Historic Flow Analysis Greenbelts, Agricultural 2 Streets: Paved 100 Packed Grave ;Includes Road Base and Compacted, Cleared, Earthe-i Areas typically used for Roads/Parking/Storage) 40 Recycled Asphalt Pavement 75 Drives and Walks 90 Table 5-3 through Table 5-5 use the impervious percent value (expressed as a decimal) to calculate the runoff coefficients for Natural Resources Conservation Service (MRCS) hydrologic soil groups A, B, and C/D for various storm return periods. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 140 Table 5-3 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-A) Equation Hydrologic Soil Group A 5 -Year 10 -Year 100 -Year Cs = (-0.081+ (1.3113- 1.4412+ -0.12) 0.09) 1.1351 + C10 = (-0.141 + 0.17) (1.3113- 1.4412+ 1.1351 -0.12) + Coo = (1.3113- (-0.25i + 0.32) 1.4412+ 1.1351 -0.12) + 2% 0.00 0.07 0.22 5% 0.02 0.10 0.24 10% 0.06 0.14 0.28 15% 0.10 0.17 0.30 20% 0.13 0.20 0.33 25% 0.16 0.23 0.35 30% 0.19 0.25 0.37 35% 0.22 0.28 0.39 40% 0.25 0.30 0.41 45% 0.27 0.33 0.43 50% 0.30 0.35 0.45 55% 0.33 0.38 0.47 60% 0.37 0.41 0.50 65% 0.41 0.45 0.53 70% 0.45 0.49 0.56 75% 0.50 0.54 0.61 80% 0.56 0.60 0.66 85% 0.63 0.66 0.72 90% 0.71 0.73 0.79 95% 0.80 0.82 0.86 100% 0.90 0.92 0.96 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA I 41 Table 5-4 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG-B) Equation Hydrologic Soil Group B 5 -Year 10 -Year 100 -Year Cs = (Ca + Ccd)/ 2 C10 = (Ca + Ccd)/ 2 Coo = (Ca + Ccd)/ 2 2% 0.08 0.17 0.36 5% 0.10 0.19 0.38 10% 0.14 0.22 0.40 15% 0.17 0.25 0.42 20% 0.20 0.27 0.44 25% 0.22 0.30 0.46 30% 0.25 0.32 0.47 35% 0.27 0.34 0.48 40% 0.30 0.36 0.50 45% 0.32 0.38 0.51 50% 0.35 0.40 0.52 55% 0.38 0.43 0.54 60% 0.41 0.46 0.56 65% 0.45 0.49 0.59 73% 0.49 0.53 0.62 75% 0.54 0.58 0.66 80% 0.59 0.63 0.70 85% 0.66 0.69 0.75 90% 0.73 0.75 0.81 95% 0.81 0.83 0.88 100% 0.90 0.92 0.96 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 42 Table 5-5 Runoff Coefficient Equations for Weld County/2007 MHFD (HSG C/D) Equation Hydrologic Soil Group C/D 5 -Year 10 -Year 100 -Year Cs = (0.858i3 0.7741 (-0.101+ 0.11) - 0.786i2 + 0.04) + + C10=(-0.181+0.21)+ (0.858i3 - 0.786i2 0.774i + 0.04) + Coo =(-0.391+0.46)+ (0.858i3 0.774i - 0.78612 + + 0.04) 2% 0.16 0.26 0.51 5% 0.18 0.28 0.52 10% 0.21 0.30 0.53 15% 0.24 0.32 0.54 20% 0.26 0.34 0.55 25% 0.28 0.36 0.56 30% 0.30 0.38 0.57 35% 0.33 0.40 0.57 40% 0.35 0.42 0.58 45% 0.37 0.44 0.59 50% 0.40 0.46 0.60 55% 0.43 0.48 0.62 60% 0.46 0.51 0.63 65% 0.49 0.54 0.65 70% 0.53 0.57 0.68 75% 0.58 0.62 0.71 80% 0.63 0.66 0.74 85% 0.68 0.71 0.79 90% 0.75 0.77 0.83 95% 0.82 0.84 0.89 100% 0.90 0.92 0.96 5.5.1.1 Time of Concentration The time of concentration is calculated based on the length, slope, and cover in the basin. The time of concentration is calculated by adding the initial or overland flow time and the channelized travel time. Where: tC = ti tt tc = Time of concentration, minutes t, = Initial or overland flow time, minutes tt = Channelized travel time, minutes 5.5.1.2 Initial or Overland Flow Time The initial or overland flow time will be calculated as follows: Eq. 5.5.1.1 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAVE 43 Where: t c I395(1.1-05)/Li So.33 0 Eq. 5.5.1.2 L; = Le igth of overland flow, ft (500 ft maximum for non -urbanizing undeveloped areas, 300 ft ma:dmum for urbanizing or developed areas) SO= Owerland basin slope, ft/ft 5.5.1.3 Chasnelized Flow Time The channelized flow time (travel time) will be calculated as follows: Where: tt Lt Lt SOK/So 60V lit= W3terway length, ft S0= W3terway slope, ft/ft K= NfC3 Conveyance Factor (see Table 5-6) V= Trzvel time velocity, ft/s Table 5-6 NRCS Conveyance Factor, K Type of Land Surface NRCS Conveyance Factor Tilla€e/Field 5 Shor- and lawns 7 pasture Nearly bare ground 10 Gras ;ed waterway 15 Paved areas and shallow paved swales 20 5.5.1.4 Urban Check Eq. 5.5.1.3 For developed and urbanizing basins, the maximum time of concentration shall not exceed the time of concentration c alculated by the urban check equation as follows: Where: t = Lt + 10 C[1 1.10 Ll = Wzterway length, ft Eq. 5.5.1.4 The minimum t me of concentration for urbanizing areas is 5 minutes and the minimum time of concentration f✓ r non -urbanizing areas is 10 minutes. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 144 5.5.2 Larger Basin Rainfall Methods Based on Table 5-1, areas larger than 160 acres require use of the SWMM, developed by the Environmental Protection Agency (EPA). The designer should use the most up-to-date version of SWMM. Any supporting modeling data should be included in the drainage report appendices, so that review staff can adequately review the model. Supporting documentation should include basin information, infiltration method used (with supporting coefficients, curve numbers, soil types), rainfall data, stage - storage curves for ponds and any other pertinent information for the model. Electronic submittals of the SWMM model are required with each submittal package for review by County staff. 5.6 ROADS, INLETS, AND STORM DRAINS Stormwater collection and conveyance systems (roads, inlets, and storm drains) for new developments shall be designed to convey the 100 -year storm event to the proposed detention/retention pond. Street flooding may occur, in which case traffic is disrupted as the street functions as an open channel (see Section 5.8). In these cases, the design engineer shall ensure that any flooding or surcharge of the system shall maintain public safety, minimize flood damages, and allow for emergency vehicle access as required by the local agency. Sizing of inlets, pipe systems, culverts or other drainage collection systems on private development sites should be designed to safely convey flows through the site, in a manner that will protect the site's users from harm and will not cause damage to on -site structures. The design engineer for the project shall provide calculations for pipe sizes, overtopping of roads, ditches, etc., such that the County's review engineers can verify that the drainage on -site is safe for users. The County reserves the right to comment on private drainage systems that they see as being unsafe or inadequate for the intended site use. The 100 -year developed flows must be transported safely to the site's detention pond for a controlled release. For information regarding the design of stormwater collection and conveyance systems, refer to Chapter 8, Article XI, of the Weld County Code and the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1. 5.6.1 Applicable Software It is acceptable to use HydroFLOW, CivilStorm, HY-8, FlowMaster, and StormCAD softwares to determine the hydraulic characteristics of storm networks/culverts. Inlet spread calculations and street capacities with curb and gutter to be analyzed using newest version available of MHFD's UD-Inlet spreadsheets provided on their website. Alternative modeling software may be used upon approval by the Department of Public Works. 5.6.2 Roadway Drainage Roadway classifications in Weld County are described in Section 2.1 of this WCECC and include freeways (interstates), county highways, arterials, collectors, local roads, and privately maintained roads. For collector roads, local roads, and privately maintained roads, the maximum encroachment depth over the roadway crown is 6 inches during the 10 -year storm and 18 inches during the 100 -year storm. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA rAlib I 45 Allowable roadway overtopping for interstates, county highways, and arterials shall be determined by the Public Works Director or Designee. 5.6.3 Inlets The design guidelines provided in the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1 should be used when designing stormwater inlets. In general, the allowable road capacity and maximum encroachment cepth shall dictate the placement of inlets. Inlets should be placed at low points (sumps), median breaks, ntersections, super -elevation transitions, and before cross walks and bridges, as required. The standard inlets permitted for use in Weld County streets and roads are shown in Table 5-7. Weld County has adopted CDOT (Type C, Type D, Type R and Type 13) and Greeley (Combination Type 3) Inlet detail, with modifications as provided in details sheets. See Appendix J. Note: Inlet Types C and D will require close mesh grates as directed by Weld County. Table 5-7 Inlets for Weld County Inlet Type Permitted Use Curb Opening Inlet Type R All street types with 6 -inch vertical curb Grated Inlet Type C, D Roadside ditches or swales Grated Inlet Type 13 Alleys or private drives with a valley gutter Combination Inlet Type 3 All street types with 6 -inch vertical curb Various factcrs, such as debris clogging, pavement overlaying, and variations in design assumptions can decrease the capacity of inlets. To account for these factors, Weld County recommends that the theoretical capacity calculated for inlets be reduced by the factors presented in Table 5-8. Table 5-8 Theoretical Capacity of Inlets for Weld County Condition Inlet Type Percent of Theoretical Capacity Allowed Sump or continuous grade Curb Opening Type R (5 -ft Length) 2 88 Curb Opening Type R (10 -ft Length) 2 92 Curb Opening Type R (15 -ft Length) 2 95 Continuous grade Combination Inlet Type 3 66 Sump 'Grated Inlet Type C or D2 50 Grated Inlet Type 132 50 Inlet Type 3 65 Combination 1 Type C and D inlets shall not be placed in roadways 2 CDOT Standards, with modifications 5.6.4 Pipes The design guidelines provided in the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1 should be used when designing stormwater pipes. Pipe networks shall be sized to convey the 10 -year WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 46 storm event while flowing at 80 percent of the full pipe capacity. In the 100 -year event, the hydraulic grade line (HGL) shall be kept at least one foot below manhole lids, inlet grates, and inlet curb openings. The calculated HGL for both the minor and major storm events shall be provided on all proposed final storm profile views. The minimum flow velocity (for both storm events) shall be 3 ft/s to minimize sediment deposition. Maximum flow velocity (for both storm events) shall not exceed 18 ft/s to minimize scour at the outlet. Erosion protection at the pipe outlet is required for all velocities greater than or equal to 3 ft/s. Riprap should be used at pipe outlets and have a minimum D50 of 9 inches (Type L). The minimum allowable size for a storm sewer within a public right-of-way or public drainage easement shall be 15 inches in diameter or equivalent. The Department of Public Works should be contacted to determine which types of storm sewer pipes are permissible for use in public rights of way or public drainage easements. Pipes constructed under the travel lanes of a new public roadway shall be reinforced concrete pipe (RCP), Class 3 strength or greater, depending on traffic loading, or an approved equivalent. All RCPs shall have a minimum cover of 12 inches above the pipe crown and bell to the bottom of pavement section (asphalt or concrete) at the edge of the roadway. A minimum of 12 inches of cover above the pipe crown to the top of the finished grade is required for gravel roads. If 12 inches of cover is not possible, the pipe material must be rated for a minimum of HS -20 loading or the largest expected loads crossing it (i.e., oil rigs, semi -trucks, etc.). The contractor must provide shop drawings for any precast concrete box culvert (CBC) to be approved for use by the engineer. The Manning's roughness coefficient "n" for all storm sewer capacity calculations in Weld County shall be 0.013 regardless of pipe material (e.g., concrete, polyvinyl chloride [PVC], or high -density polyethylene [HDPE])—with the exception of aluminized corrugated metal pipe (CMP), which shall have a coefficient of 0.025. However, the designer should take note that only RCP and CMP are allowed in public ROW due to ditch burning. Any other pipe material used shall only be placed outside of public ROW, or upon approval by the Department of Public Works. 5.6.5 Manholes Manholes shall be provided to allow for inspection and maintenance of stormwater systems. At a minimum, manholes shall be placed at all pipe junctions, changes in pipe size or material, and changes in grade and alignment. For long straight runs of pipe, the distance between manholes shall be limited to 400 feet (for pipe diameters < 42 inches) and 500 feet (for pipe diameters ? 42 inches). Manhole lids shall not be located within the vehicle wheel path. Table 5-9 Manhole Sizes Storm Pipe Diameter (inches) Manhole Diameter (ft) 15 inches to 18 inches 4 ft 21 inches to 30 inches 5 ft 36 inches to 54 inches 6 ft 60 inches + CDOT Standard M-604-20 It shall be noted that the designer should review the incoming and outcoming pipe angles to ensure that the manhole diameter can accommodate the pipe skew, when the pipe sewer alignment is not straight WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA FACIE X47 through, or when more than one sewer line goes through the manhole. Steps shall be provided to allow safe access i'itz the manhole. Manhole details are provided in Appendix J 5.7 OPEN- CHANNELS, ROADSIDE DITCHES, AND GRASS SWALES It is important to distinguish the difference between channels, ditches, and swales. Open channels and grass swales o -tin are existing drainage conveyances that either carry large offsite flows around a site or carry onsite flcvws to a detention pond on -site. County -owned roadside ditches are common along rural roads and provide runoff conveyance for the County's roadway infrastructure. Irrigation ditches are not considered to -all under any of these definitions and shall be treated as separate infrastructure altogether. Open channels, grass swales, storm pipe systems, and culverts located on new development sites need to ensure runcff from the developed site for the 100 -year storm event can safely reach the on -site detention pc J with adequate capacity and freeboard. This can be a combination of overland flow, pipes, or swales to get the runoff to the pond, without it leaving the site. The design engineer needs to provide calculEt ons to show that the 100 -year developed flows make it to the pond without overtopping or exceeding the capacity of the proposed drainage system. Any off -site flows that are planned to be -outed around the developed site must be designed using a 100 -year runoff value, so that no unplanned -lows enter the proposed site that were not planned for in the detention pond's spillway calculations. Roadway ditches that are designed by consultants for the County (for County -owned and maintained roadways only may use a developed runoff from the 10 -year, 1 -hour storm event in their ditch designs. For more information regarding the design of open channels, refer to Chapter 8, Article XI, of the Weld County Code aid the Open Channels chapter of the USDCM, Volume 1. Information regarding the design of roadside ditc-ies is provided in the Streets, Inlets, and Storm Drains chapter of the USDCM, Volume 1. If grass swales are used, they shall be designed in accordance with the Grass Swales Fact Sheet (T-2) of the USDCM, Vcilume 3. 5.7.1 Applicable Software The design of cpen channels, grass swales, and roadside ditches is to be completed in FlowMaster or Hydraflow Express Extension for Autodesk software. Channels, swales, and roadside ditches will be designed to acccunt for any erosive or hazard conditions. It is acceptable to use USACE's HEC-RAS software to determine the hydraulic characteristics of large open channels. HEC-RAS modeling shall be performed to align with standard modeling practices accepted by FEMA. It is the designer's responsibility to effectively model erosive, hazard, or local scour in a channel for estimating maximum velocities. The designer shall create a model that adequately places the correct number of crass sections in the necessary locations to accurately make an evaluation of velocities throughout the :flannel to determine its erosive and scour potential. 5.7.2 Open Channels and Swales Generally, char nels and swales should be designed as a trapezoidal shape with a minimum two -foot bottom width and side slopes no steeper than 4:1. If, however, steeper slopes are required due to site WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGF 148 constraints, the design engineer should address how the channels will be maintained, since it may not be safe to mow on slopes that are greater than 4:1. The design engineer also should consider the appropriate seed mix and seeding application method when determining side slopes. More information on seed mixes and revegetation can be found in Chapter 6 of this WCECC. Open channels and swales shall be designed to allow the 100 -year design flow plus a minimum of one foot of freeboard. However, channels conveying less than 20 cfs may reduce the minimum one -foot freeboard requirement to the freeboard required to convey 1.33 times the 100 -year design flow. The reduced freeboard may only occur if a one -foot minimum freeboard is not physically possible, and calculations are submitted. Hydraulic structures (check/drop structures, bridges, transitions, constrictions, bends, confluences, rundowns) associated with open channels shall be designed for the 100 -year storm event. For more information regarding the design of hydraulic structures, refer to Chapter 8, Article XI, of the Weld County Code, the most recent version of Hydraulic Structures chapter of the USDCM, Volume 2, and Chapter 4.7 - Bridges of this WCECC. MHFD has published guidelines for typical Manning's n values and other design criteria for "V" and trapezoidal swales. Table 5-10 through Table 5-12 and Figure 5-2 and Figure 5-3 below provide guidance for channel design. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 49 Table 5-10 Roughness Coefficients ("n") for Channel Design (After Chow 1959) Channel Type Roughness Coefficients (n) Minimum Typical Maximum Excavated 1. Eart 1, or straight Dredged and uniform a. Gravel, uniform section, clean 0.022 0.025 0.030 b. With short grass, few weeds 0.022 0.027 0.033 2. Eart 1. winding, and sluggish a. Grass, some weeds 0.025 0.030 0.033 b. Cense weeds or aquatic plants 0.030 0.035 0.040 c. Earthy bottom and rubble/riprap sides 0.028 0.030 0.035 3. Char nels not maintained, weeds and brush uncut a. Dense weeds, high as flow depth 0.050 0.080 0.120 b. Clean bottom, brush on sides 0.040 0.050 0.080 II. Natural s- reams (top width at flood stage 100 ft) 1. Strei ms on plain a. C ean, straight, full stage, no rifts or deep pools 0.025 0.030 0.033 C b. weeds ean, winding, and some stones pools and shoals, some 0.035 0.045 0.050 Very c. with weedy heavy reaches, stand of deep timber pools, and or underbrush floodways 0.075 0.100 0.150 Ill. Lined or Eu It -Up Channels 1. Concrete a. Trowel/float finish 0.011 0.015 0.016 b. Shotcrete 0.016 0.020 0.025 2. Grav ?l bottom with sides of: a. =ormed concrete 0.017 0.020 0.025 b. Random stone in mortar 0.020 0.023 0.026 c. D -y rubble or riprap 0.023 0.033 0.036 3. Wetl mnd Bottom Channels See Figure 5-2 4. Gras! -Lined Channels and Swales See Figure 5-3 WELD COUNT'' ENGINEERING & CONSTRUCTION CRITERIA PAGE I 50 Figure 5-2 Manning's n vs. Depth for Low -Flow Section in a Composite Channel Manning's n Value .070 .065 .060 .055 . 050 . 045 .040 .035 . 030 2 n=0.0001tY'I-0.0025(Y)+0.050 OA206(Y) + 0.099 4 5 6 7 Depth of Flow Y, in Feet 8 10 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 51 Figure 5-3 Manning's n vs. VR for Two-Retardances in Grass -Lines Channels MANNING'S n 05 04 03 02 01 08 06 05 04 03 02 , , . 2/ Channel capacit design curve - I Retardance (C) -r • (D) . t lialrting velocity / t I 1 - n de.sr cure g e • 1 02 03 04 0506 08 10 9 1 4 c. R g in nn 30 VR, PRODUCTOF VELOCITYAND HYDRAULIC RADIUS From "Handbook of Channel Design For Soil and Water Conservation, U S Department of Agriculture, Soils Conservation Service, No SCS-TP-61 March, 1947. Rev June. 1954 Table 5-11 Trapezoidal Channel Design Guidance/Criteria Design Item Criteria for Various Types of Channel Lining Grass: Erosive Soils Grass: Erosion Resistant Soils Riprap - Concrete Maximum 100-yr Velo _Ai 3.0 ft/sec 5D ft/sec 12.0 ft/sec I 18.0 ft/sec Minimum Manning's r - capacity check a030 0.030 0.030 0.011 Maximum Manning's r - capacity check a035 0.035 a040 0.013 Maximum Froude Nurt ber 0.5 . 0.8 0.8 n/a Maximum side slopeI 4H:1V 4H:1V 2.SH:1V 1.5H:1V Minimum 2 x top width 2 x top width 2 x top width 2 x top width centerline redius for a bend Minimum freeboard 1.0 ft 1.0 ft 1.0 ft 1.0 ft 5.7.3 Roads de Ditches The designer sh all design flexible ditch linings based on FHWA's Design of Roadside Channels with Flexible Linings Hydraulic Engineering Circular No. 15 (HEC-15) guidelines and should coordinate with the Department of Public Works for approval of the chosen lining. Riprap-lined ditches shall have a minimum D50 o: 9 inches (Type L). Roadside ditches shall be designed to maintain a minimum of one foot of freeboard during the 10 -year storm event. Design criteria, provided in the previous Open Channels and Swales section, should be used in the design pof roadside ditches as well. WELD COUNT`' ENGINEERING & CONSTRUCTION CRITERIA PAGE I 52 5.8 CULVERTS Culverts are structures that convey flow through embankments such as roadways and railroads and should not be confused with storm drainage systems. If a project uses culverts in any facet and connects to County facilities, then the culvert and associated facilities must convey the 100 -year storm event flow. A culvert is required for every new access point or supporting documentation must be provided to the County to show that a culvert is not needed. For more information regarding the design of culverts, refer to Chapter 8, Article III, Article XI, and Appendix 8-B of the Weld County Code and the Culverts and Bridges chapter of the USDCM, Volume 2. See also the latest edition of AASHTO's Roadside Design Guide. 5.8.1 Applicable Software It is acceptable to use FHWA's HY-8 or CulvertMaster culvert analysis software to determine the hydraulic characteristics of culverts. Alternative modeling software may be used upon approval by the Department of Public Works. 5.8.2 Sizing Culverts shall be sized such that any roadway overtopping meets allowable street capacity and maximum encroachment depth requirements. The minimum allowable size for a culvert within a public right-of-way or public drainage easement shall be 15 inches in diameter or equivalent. Weld County may require additional culvert capacity to prevent flooding and backwater effects on adjacent properties. The storm drainage system for a developed site, via culverts, inlets, swales, pipe systems, must provide adequate capacity to safely convey the 100 -year developed runoff to the site's detention/retention pond without leaving the site. If the culvert/pipe system is undersized and results in flooding, the flooding must be contained onsite. It should be shown that on -site flooding does not impact permanent structures or buildings on -site. Developed runoff from the site may not adversely impact adjacent or downstream properties. The maximum overtopping of local or collector County roads during the 10 -year storm event is 6 inches and 18 inches in the 100 -year event. However, the County prefers to minimize overtopping to the greatest extent possible. Allowable roadway overtopping for county highways and arterials shall be determined by the Public Works Director or Designee. Private culverts/swales within developments must be sized to provide adequate capacity to carry runoff from the 100 -year event safely to the proposed detention/retention pond. Additionally, culverts must be sized to meet the maximum headwater to depth ratios (HW/D) listed in Table 5-12. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 53 Table 5-12 Maximum HW/D Requirements for Weld County Range of Diameter or Height or Rise (Inches) Maximum HW/D Less than 36 inches 2.0 36 inches to 60 inches 1.7 Larger than 63 in:hes but less than 84 inches 1.5 84 inches to less :han 120 inches 1.2 120 inches or larger 1.0 Culverts shall be installed to the minimum slope required to achieve a minimum flow velocity of 3 ft/s to minimize sediment deposition within the pipe. The slope should be checked for each design, and if the proper minimum velocity is not obtained, other design options should be evaluated. Maximum velocity at the culvert exit should be consistent with the velocity in the channel to which it discharges so as to reduce the risk of scouring at the culvert outlet. Energy dissipators may be required and shall be designed per the most recent version of Hydraulic Structures chapter of the USDCM, Volume 2, and the guidelines in the FHWA Hydraulic Design of Energy Dissipators for Culverts and Channels, Hydraulic Engineering Circular No. 14 (HEC-14). 5.8.3 Materials Weld County allows the installation and use of commonly available culvert types such as RCP and aluminized Cfv1P within the public right-of-way. Weld County will allow the use of other culvert types on a case -by -case basis when complete documentation of all culvert specifications is provided. It should be noted that pipe materials that do not withstand high temperatures (burning of roadside ditches), should not be used within the County ROW. 5.8.4 Cover All culverts must be installed with a minimum of 12 inches of cover above the pipe crown and bell to the bottom of asphalt at the edge of pavement (for paved roads) and a minimum of 12 inches of cover above the pipe crown to the top of the finished grade (for gravel roads). If 12 inches of cover is not possible, the cukert material must be rated for a minimum of HS -20 loading or the largest expected loads crossing it (i.e., oil rigs, semi -trucks, etc.). 5.8.5 End Sections and Safety Grate At a minimum, culverts installed in public rights -of -way must be equipped with a flared end section or headwalls on the culvert entrance and outlet, as directed by Public Works. Cutoff walls below the outlet end section shall be 4,500 psi concrete with epoxy coated #5 rebar 12" on center each way, three inches clear from all earthen edges, 8" wide x 3' deep and 2' beyond each outside edge of the end section. There may be situations in which other types of culvert inlets are necessary. In those situations, the design methodologies outlined in the Culverts and Bridges chapter of the USDCM, Volume 2 should be used. Safety grates are strongly recommended at culvert entrances to prevent people, animals, and large debris from inadvertently entering a culvert. Safety grates shall not be placed at the outlet of culverts or storm drains. The following conditions may require use of a safety grate: • It is not possible to see daylight from one end of the culvert to the other. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PACF I 54 • The culvert is less than 42 inches in diameter. • Conditions within the culvert (bends, obstructions, vertical drops) or at the outlet are likely to trap or injure a person. Exceptions to the above criteria consist of street curb -opening inlets and driveway culverts that are subject to ponding depths no greater than 12 inches at the flowline and culvert entrances that are made inaccessible to the public by fencing. Sound engineering judgement should be used to determine the need for a safety grate while also considering hydraulic forces and clogging potential. Undersized or poorly designed grates can become clogged during heavy runoff and the culvert may be rendered ineffective. Additionally, the surrounding site features and depth and velocity of flow may increase the risk of pinning a human or animal against the grate. To minimize these hazards, safety grates should be sized according to the Outlet Structures Fact Sheet (T-12) of the USDCM, Volume 3 and designed to meet the following criteria: • Grates should be inclined at a slope no steeper than 3:1 (flatter is better) and have a clear opening at the bottom of no more than 9 inches to permit passage of debris and bed load at lower flows. • Weld County does not allow the use of collapsible gratings. 5.8.6 Maintenance The County will maintain culverts located within the County ROW. Private property owners are responsible for maintenance of their culverts. Culverts that are part of a subdivision drainage plan are maintained by the respective homeowner's association. Those culverts should be maintained and cleaned out on an as -needed basis to ensure proper drainage of the subdivision. Safety grates should be inspected and cleaned after every large storm event (at a minimum) to ensure that the systems remain effective and that clogging and pinning risks are minimized. 5.9 RIPRAP Riprap should be included on the downstream end of culverts and pipe systems to provide erosion protection. The following direction should be used when designing riprap aprons at the outlet of culverts and pipe systems. Mirafi FW-300 or approved equivalent shall be installed under all riprap. 5.9.1.1 Configuration of Riprap Apron Figure 5-4 illustrates typical riprap protection of culverts outlets. 5.9.1.2 Extent of Protection The length of the riprap protection downstream from the outlet depends on the degree of protection desired. If it is necessary to prevent all erosion, the riprap must extend until the velocity decreases to an acceptable value. The acceptable major event velocity is set at 3 ft/sec for non -cohesive soils and at 5 ft/sec for erosion resistant soils. The rate at which the velocity of a jet from a conduit outlet decreases is not well known. The procedure recommended here assumes the rate of decrease in velocity is related to the angle of lateral expansion, 0, of the jet. The velocity is related to the expansion factor, 1 2tan0 which can be determined directly using Figure 5-5 or Figure 5-6 by assuming the expanding jet has a rectangular shape: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAULPAuL 155 Where: and: Where: LP C2tan 6J "yt W LP = Length of protection (ft) W = V/idth of the conduit (ft, use diameter for circular conduits) Yt = Tailwater depth (ft) 0 = —lee expansion angle of the culvert flow A t Q V At = recuired area of flow at allowable velocity (ft2) V = th ? allowable non -eroding velocity in the downstream channel (ft/sec) Q = dEsgn discharge (cfs) For Eq. 5.9.1: Eq. 5.9.1 Eq. 5.9.2 • If the tailwater elevation is unknown or unable to be calculated, a value of 0.4 x the culvert height or pipe diameter may be used for Yt. 1 • The expansion factor can be found from Figure 5-5 and Figure 5-6 shown below, after 2tan 0 calculating n/D2.5. • In the calculations for At, the allowable non -eroding velocity in the downstream channel should be: O 3.0 ft/sec for erosive soils 5.0 ft/sec for non -erosive soils In certain circumstances, Eq. 5.9.1 may yield unreasonable results. Therefore, in no case should Lp be less than 3H or 3D, nor does Lp need to be greater than 10H or 10D whenever the Froude parameter, 0/WH' 5 or C`/D` 5, is less than 8.0 or 6.0, respectively. Whenever the Froude parameter is greater than those maximums, increase the maximum Lp required by %D, or %H for circular or rectangular (box) culverts, respe :tively, for each whole number by which the Froude parameter is greater than 8.0 or 6.0, respectively. Once Lp has be ?n determined, the width of the riprap protection at the furthest downstream point should be verif ed. This dimension is labeled "T" on Figure 5-4. The first step is to solve for 0 using the results from Figure 5-5 or Figure 5-6: A = tin -1 Where: 1 1 2(ExpanslonFactor)/ • Expans cn Factor = determined using Figure 5-5 or Figure 5-6 Eq. 5.9.3 WELD COUNT ( ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 56 T then is calculated using the following equation: T Figure 5-4 2 (Lp tan6) + W Eq. 5.9.4 Riprap Apron Detail for Culverts In Line with the Channel (USDCM, Vol 2 Figure 9-34) EXTEND RIPRAP TO HEIGHT OF PIPE OR BOX, MIN. RIPRAP MORE THAN 1.0' ABOVE PIPE INVERT SHALL BE INSTALLED 6" BELOW FINISHED GRADE AND BURIED WITH TOPSOIL FINISHED GRADE TOEWALL 8" THICKNESS 3' MINIMUM DEPTH PLAN NTS END TREATMENT MAY CONSIST OF RCP END SECTION (WITH TOEWALL) OR HEADWALL L • GEOTEXTILE EROSION CONTROL. MIRAFI 300 OR EQUAL 2D% MIN PROFILE NTS SOIL RIPRAP OR VOID -FILLED RIPRAP WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 57 Figure 5-5 Expansion Factor for Circular Conduits (USDCM, Vol 2 Figure 9-35) 8 = Expansion Angle 0 c a N EXPANSION 5 4 2 0 Q .1 .2 3 4 .5 _6 .7 .8 ti Q t� I 4f' o • 0 �� ^_, o O 0 o 0 Co. / / / Ail e'ii TAILWATER DEPTH/ CONDUIT HEIGHT, Yt/D / D WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 58 Figure 5-6 Expansion Factor for Rectangular Conduits (USDCM, Vol 2 Fig 9-36) 8 = Expansion Angle ilipMEMS 6 C c 0 N5 S. V 4 2 3 0 2 Q a -x 2 W .1 .2 .3 .4 .5 .6 .7 .8 TA(LWATER DEPTH/ CONDUIT HEIGHT -Yfi/H 10 The size of riprap can be found using the following graph after calculating Q/D1.5 and Yt/Dc and reading the value from Figure 5-7 and Figure 5-8, shown below. Use Figure 5-7 to determine the required rock size for circular conduits and Figure 5-8 for rectangular r conduits. Figure 5-7 is valid for Q/Dc2 5 of 6.0 or less and Figure 5-8 is valid for Q/WH .5 of 8.0 or less. The parameters n these two figures are: =Ls or Q/WH05 in which Q is the design discharge in cfs, Dc is the diameter of a circular conduit in feet, and W and H are the width and height of a rectangular conduit in feet. Yt/Dc or Yt/H in which Yt is the tailwater depth in feet, Dc is the diameter of a circular conduit in feet, and H is the height of a rectangular conduit in feet. In cases where Yt is unknown or a hydraulic jump is suspected downstream of the outlet, use Yt/Dt = Yt/H = 0.40 when using Figure 5-7 and Figure 5-8. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r i u E 159 Figure 5-7 Riprap Erosion Protection at Circular Conduit (Valid for Q/D2.5≤6.0) (USDCM, Vol 2 Figure 9-38) in a 0 Yt/D 8 1O Use Do instead of D whenever flow is supercritical in the barrel. **Use Type L for a distance of 3D downstream. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 60 Figure 5-8 Riprap Erosion Protection at Rectangular Conduit Outlet (Valid for Q/WH1.5≤8.0) (USDCM, Vol 2 Figure 9-39) 6O 0 4O 3 0 20 ,<<v 0Q- i rir , coom $ Q1 X\ rcPs r .2 .4 Yt/H 6 8 1.0 Use Ha instead of H whenever culvert has supercritical flow in the barrel. **Use Type L for a distance of 3H downstream After selecting the riprap size, the minimum thickness of the riprap layer is defined as: T=2D50 Table 5-13, below, identifies d50 based on riprap classification and gradation. Eq. 5.9.5 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 61 Table 5-13 Classification and Gradation of Ordinary Riprap Riprap Designa. on % Smaller Given Size by Than Weight Dimensions Intermediate (inches) Rock d (inches)' Type VL 70-100 12 50-70 9 35-50 6 6" 2-10 2 Type L 70-100 15 50-70 12 35-50 9 9" 2-10 3 Type M 70-100 21 50-70 18 35-50 12 12" 2-10 4 Type H 70-100 30 50-70 24 35-50 18 18 2-10 6 Type VH 70-100 42 50-70 33 35-50 24 24 2-10 _ 9 • dso = mean particle size (intermediate dimension) by weight. " Mix VL and L riprap with 30% (by volume) topsoil and bury it with 6+ inches of topsoil, all vibration compacted, and revegetate. 5.10 STORAGE Weld County requires regional and/or on -site detention for all future developments. The County shall be contacted to verify if any existing drainage master plans exist in the area of work. If it is determined that there is an exist ig master plan for the area of work, the designer shall incorporate that information into the design and ensure that the design follows the drainage requirements set forth in the masterplan. The designer also should keep the following things in mind: • Weld County does not allow detention release rates based on soil types. • Weld County does not allow full spectrum detention to be used in sizing ponds (see Weld County's spreadsheets for storage capacity). 5.10.1 Retention Stormwater retention facilities (stormwater infiltration facilities) normally are not allowed in Weld County but shall be considered for special circumstances with the issuance of a variance. Variance requests shal only be considered in situations where there is a proven hardship on the proposed site. A hardship would ae considered where there is not adequate topography to physically drain a pond (sump in basin), refusal of an irrigation ditch to accept additional drainage, or some other physical site constraint. Variances shall be reviewed on a case -by -case basis to determine the validity of the hardship and shall be signed by the Development Review Engineer. Upon the determination that a retention pond is applicab e, the volume should be calculated as 1.5 x the developed site runoff for the 100 -year, WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 62 24 -hour storm event plus 1 foot of additional freeboard. An emergency spillway is required for retention ponds. Retention ponds may be sized using the "Modified FAA" tab on the spreadsheet referenced in the "Detention" portion of this document, using a near zero release rate per acre and extending the rainfall duration to 1440 minutes (24 -hours x 60 minutes). The resulting volume at the 1440 -minute interval shall be the value that must be multiplied by 1.5 for tele final retention pond volume. A second method for calculating retention pond volume is: Volume = 1.5 x Area x C -Value x Rainfall • Area = Site area draining to pond (acres) • C -Value = Composite C -Value for area draining to pond (based on soil type and overall, developed impervious percentage for site) • Rainfall — NOAA Atlas rainfall depth for site location, 100 -year storm at 24 -hours (in feet, divide NOAA rainfall depth in inches by 12) • Volume = Required Volume for Retention Pond in acre -ft The retention pond/infiltration facility shall be designed to meet Colorado Revised Statute 37-92-602 (8) drain time requirements. In order to meet the State Statute requirements, soil infiltration rates may be u sed to calculate pond drain times. However, soil infiltration rates cannot be used in the overall sizing o f the detention/retention ponds. These requirements state that retention facilities: • Be solely operated for stormwater management; • Be owned and operated by a governmental entity or is subject to oversight by a governmental entity; • Continuously releases or infiltrates at least 97 percent of all runoff from a rainfall event that is less than or equal to the 5 -year storm within 72 hours after the end of the event; • Continuously releases or infiltrates at least 99 percent of the runoff from a rainfall event that is greater than the 5 -year storm within 120 hours after the end of the event; and • Operates passively and does not provide active water treatment processes for the stormwater. 5.10.2 Detention Developments are required to detain the runoff (developed site condition) produced by the 100 -year, 1 - hour storm event with 1 foot of additional freeboard. Pond release rates are based off the calculated undeveloped runoff value for the site. A 2 -percent site imperviousness should be used to calculate the historic runoff rate for pond release values, regardless of site conditions prior to new site improvements. Release rates are calculated using the 5 -year, 1 -hour storm for urbanizing areas and the 10 -year, 1 -hour storm for non -urbanizing areas. Urbanizing areas are defined as areas within one -quarter mile of any municipal boundary, as amended. Non -urbanizing areas are greater than one -quarter mile in distance from a municipal boundary. Municipal boundaries may be found on the County's GIS online mapping website. If the project site is within an urbanizing area or adjacent to a municipal boundary, the governing entity's drainage criteria must be taken into consideration. Weld County requires that the WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A v E I 63 more restrictive of the criteria (if municipality is more conservative) must be used in the drainage design of the site. The design engineer shall submit all design worksheets for pond designs in the appendices of the drainage repo -t for review. Rainfall data/depths should be site specific and taken from the NOAA Atlas 14, online precipitation frequency data server webpage. A UD-Detention v2.34 worksheet is available on the Weld Cowry Planning and Zoning Development Review webpage. This spreadsheet is an older, archived version of the MHFD's spreadsheet, which utilizes the "Modified FAA" procedure for pond sizing with the County approved C -values. The County DOES NOT accept the full spectrum detention pond design rr ethod. The design consultant may use the downloadable spreadsheets or may create their own based on the information provided in this document. If created spreadsheets are utilized, they must comply N./4 th the design requirements in this document. Rainfall duration times should be extended until the pond reaches a peak volume, after which the pond volume falls. If The peak is not reached within a reasonable time period (less than two to three hours ±) the volume at :le 60 -minute interval may be taken as the required detention volume for the site. If a series of detention ponds are proposed on -site, the County may require a SWMM model be created for the developmc nt, so that the pond volumes/water surface elevations can be analyzed as routed ponds. An excerpt fro 1n a previous version of USDCM, Volume 2 on the Modified FAA procedure has been provided on the Weld County Planning and Zoning Development Review Webpage, and in Appendix F for reference, f the consultant would like to create their own pond -sizing spreadsheet. The outlet wor<s for detention and water quality facilities shall be designed to meet Colorado Revised Statute 37-92-602 (8), drain time requirements. In order to meet the State Statute requirements, soil infiltration ratEs may be used to calculate pond drain times. However, soil infiltration rates cannot be used in the O /E rail sizing of the detention/retention ponds. These requirements state that detention facilities: • Be sc le I y' operated for stormwater management; • Be owr ed and operated by a governmental entity or be subject to oversight by a governmental entity; • Continuously release or infiltrate at least 97 percent of all runoff from a rainfall event that is less than or equal to the 5 -year storm within 72 hours after the end of the event; • Continuously release or infiltrate at least 99 percent of the runoff from a rainfall event that is greater than the 5 -year storm within 120 hours after the end of the event; and • Operator passively and do not provide active water treatment processes for the stormwater. 5.10.2.1 Pone Layout Considerations The geometry cf a stormwater detention facility depends on specific site conditions such as adjoining land uses, topography, geology, preserving or creating wildlife habitat, and volume requirements. Several key fea- ures must be incorporated in all detention facilities: • Embantr'ents and side slopes shall have a maximum slope of four feet horizontal to one foot vertical (4:1) and shall be stabilized. Slopes steeper than 4:1 in detention basin areas will not be acceptE d. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 164 • Detention basin embankments shall be designed to withstand the 100 -year and larger storm. Poorly compacted native soils shall be excavated and replaced. Embankment soils shall be compacted to at least 95 percent maximum density (Modified Proctor) or as specified in the geotechnical report for the site. • Detention basin bottoms shall have a minimum slope of 1 percent for vegetated surfaces. If the desired slope is not attainable, a bottom slope of 0.5 percent may be used with a concrete trickle channel. • Water quality and detention flows are released through an outlet structure. The minimum outlet pipe size for use in detention facilities is 12 -inch diameter (or equivalent). Orifice/restrictor plates may be used to reduce flows from the minimum pipe sizes. • When possible, place inflow culverts as far from the pond outlet as possible for increased water quality through pond vegetation. • Inflow points shall enter the detention basin at or near the toe of the basin to prevent erosion along the basin embankments. If providing an inflow point at the toe of the basin is not feasible, then erosion protection must be provided from the inflow all the way to the toe of the basin. • Detention basin bottom must be a minimum of 24 inches above the groundwater elevation. (Groundwater elevation data must be determined during high groundwater months.) • Detention basins must be located a minimum of 20 feet away from an irrigation ditch or other facility, or more if specified by the owner of the irrigation canal and protected from seepage from the irrigation canal. • Stormwater infiltration facilities shall not be placed in the FEMA mapped floodway and should not be placed in the FEMA mapped 100 -year floodplain. Any berming within the floodplain will require a floodplain study, which may result in the need for a LOMR/CLOMR. 5.10.2.2 Water Quality With drain time requirements in mind, the outlet works for an extended detention basin shall be designed to release the water quality capture volume (WQCV) over a 40 -hour period. The WQCV may be calculated, along with the orifice hole sized, on the MHFD spreadsheet. An alternate method to calculate the required WQCV is to use the equations taken from USDCM, Volume 3 as shown below. The WQCV is calculated as a function of imperviousness and BMP drain time using Eq. 5.10.2.1, and as shown in Figure 5-9: WQCV = a(0.91i3 — 1.1912 + 0.78i) Eq. 5.10.2.1 Where: WQCV = Water Quality Capture Volume (watershed inches) a = Coefficient corresponding to WQCV drain time (5-) i = Imperviousness (%/100) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G 165 Figure 5-9 Water Quality Capture Volume (WQCV) Based on BMP Drain Time (USDCM, Vol 3 Fig 3-1) to • s c L C 0,500 0,450 0.400 0.350 0.300 0.250 0.200 0.15C 0.100 0.050 0.000 40 hour drain time u � 0 24 hour drain time ♦ e .. too W V=a (O.9 wa t .19F+0,780 -�- 12 24 -hr -hr drain drain time a = 0.8 tame a = 0.9 40 -hr drain time a = I.0 deOP ,le d. OOP 12 hour drain time or as* r ... - • I A r 0 0, 1 0,2 0.3 0.4 0.5 0-6 0.1 0.8 0 9 Total Imperviousness Ratio (I = la/100) Figure 3-1. Water Quality Capture Volume (WQCV) Based on BNB) Drain Time Table 5-14 Drain Time Coefficients for WQCV Calculations Drain Time (hrs) Coefficient, a 12 hours 0.8 24 hours 0.9 40 hours 1.0 Weld County does not require the use of trash racks be placed in front of the water quality plate. It shall be at the discretion of the design engineer if trash racks are included. The WQCV is considered a part of the overall detention/retention volume requirement and should not be added to the volume. The water quality orifice plate perforations also may be found using the chart in Table 5-15 only. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 66 Table 5-15 WQCV Outlets Orifice Plate Perforation Sizing Orifice Plate Perforation Sizing Circular Perforation Sizing This table may be used to size perforation in a vertical plate of riser pipe. Hole (in.) Dia. * Hole (in.) Dia. Min. S. (in.) Area per Row (sq. in.) n= 1 n= 2 n= 3 1/4 0.250 1 0.05 0.10 0.15 5/16 0.313 2 0.08 0.16 0.24 3/8 4 0.375 2 0.11 0.22 0.33 7/16 0.438 2 0.15 0.30 0.45 1/2 0.500 2 0.20 0.40 0.60 9/16 0.563 3 0.25 0.50 0.75 5/8 0.625 3 0.31 0.62 0.93 11/16 0.688 3 0.37 0.74 1.11 3/4 0.750 3 0.44 0.88 1.32 13/16 0.813 3 _ 0.52 1.04 1.56 7/8 0.875 3 0.60 . 1.20 1.80 15/16 0.938 3 0.69 1.38 2.07 1 1.000 I 4 0.79 1.58 2.37 1 1/16 1.063 4 0.89 1.78 2.67 1 1/8 1.125 4 0.99 1.98 2.97 1 3/16 1.188 4 1.11 2.22 3.33 1 1/4 1.250 4 1.23 2.46 3.69 1 5/16 1.313 4 1.35 2.70 4.05 1 3/8 1.375 4 1.48 2.96 4.44 1 7/16 1.438 4 1.62 3.24 4.86 1 1/2 1.500 4 1.77 3.54 5.31 1 9/16 1.563 4 1.92 3.84 5.76 1 5/8 1.625 4 2.07 4.14 6.21 1 11/16 1.688 4 2.24 4.48 6.72 1 3/4 1.750 4 2.41 4.82 7.23 1 13/16 1.813 4 2.58 5.16 7.74 1 7/8 1.875 4 2.76 5.52 8.28 1 15/16 1.938 4 2.95 I2 5.90 8.85 2.000 4 3.14 6.28 9.42 n = Number of columns of perforations Minimum steel plate thickness 1/4" 5/16" 3/8" * Designer the needed may interfere area if desired. to the nearest 32-'' inch to better match Rectangular Perforation sizing Use only one rectangular column whenever two 2;inch diameter circular perforations cannot provide needed outlet area. Rectangular Height = 2 -inches Rectangular Width = Required Area per Row / 2" Rectangular hole Width Min. Thickness Steel 5" 1/4 " 6" 1/4 " 7" 5/32 " 8" 5/16" 9" 11/32" 10" 3/8 " > 10" 1/2 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA ?ACC I 67 5.10.2.3 Outlet Structure Included below s a typical configuration for a detention pond outlet structure. The detail shows the general features and layout of the basic components of a typical outlet structure. Figure 5-10 is not a construction d Mail. The design engineer will be required to design the outlet structure to meet the needs of the irdividual site plan and topography. In addition, the following items must be included in the outlet structure design: • The outlet pipe must contain a minimum of two concrete cutoff walls embedded a minimum of 18 inch es into undisturbed earthen soil. The cutoff walls must be a minimum of 8 inches thick. • The outlet pipe bedding material must consist of native earthen soil, not granular bedding to at least the first downstream manhole or daylight point. • A water quality plate designed to release the WQCV in 40 -hours attached to the front of the structL re. Plate should be a tight fit with no gaps. Gasket or seal could help facilitate this fit. • A restr ctor plate attached to the back wall of the structure to limit the pond release to the calculated 5 -year or 10 -year historic runoff rate for the site (see detention pond section for details • The octet pipe must be a minimum diameter of 12 -inches. • To reduce maintenance and avoid operational problems, outlet structures must be designed with no moving parts other than the trash rack (i.e. use only pipes, orifices, and weirs). Manually and/or electrically operated gates shall be avoided. To reduce maintenance, outlets should be designed with openings as large as possible, compatible with the depth -discharge relationships desist and with water quality, safety, and aesthetic objectives in mind. • Outlets should be robustly designed to lessen the chances of damage from debris or vandalism. Avoid th e use of thin steel plates as sharp -crested weirs to help prevent potential accidents, especiE Ily with children. Trash racks must be provided on all outlet structures. WELD COUNT` ENGINEERING & CONSTRUCTION CRITERIA PAGE 168 Figure 5-10 Outlet Structure Plan and Profile Example OUTLET REQUIREMENTS WQCV SHALL BE RELEASED OVER 40 HOURS OUTLET WORKS SHOULD BE SIZED AND STRUCTURALLY DESIGNED TO RELEASE AT NO MORE THAN THE 1 -HOUR, 5 -YEAR HISTORIC RELEASE RATE IN URBANIZING AREAS AND THE 1 -HOUR. 10 -YEAR HISTORIC RELEASE RATE IN NON -URBANIZING AREAS. OPENINGS IN THE SAFETY GRATE SHALL ALLOW ENOUGH FLOW TO PASS THE 5 -YEAR OR 10 -YEAR HISTORIC FLOW (DEPENDENT ON URBANIZATION CLASSIFICATION), USING A 50% CLOGGING FACTOR. STEEL FOR GRATES AND GRATE INSTALLATION HARDWARE SHALL BE GALVANIZED AND CONSTRUCTED IN ACCORDANCE WITH COOT SECTION 712.06. CONCRETE SHALL BE CDOT CLASS O, 4500 PSI IN 28 DAYS, PER COOT SPECIFICATION SECTION 601. REINFORCEMENT BARS SHALL BE PER COOT SPECIFICATIONS. SPACING AND SIZE TO BE DETERMINED BY CONSULTING DESIGN ENGINEER. STEPS SHALL BE PROVIDED WHEN HEIGHT IS GREATER THAN 3'-6" AND SHALL CONFORM TO AASHTO M 199. OUTLET STRUCTURE SAFETY GRATE j- OUTLET PIPE 12" MIN. 40- ra ,__ RESTRICTOR ORIFICE PLATE WATER QUALITY PLATE WQCV ORIFICE PLATE (HOT -DIPPED GALVANIZED STEEL) I I PLAN VIEW I --' SECTION A -A' SAFETY GRATE WQCV WSEL WQCV ORIFICE PLATE HOT -DIPPED GALVANIZED STEEL ,1 a I • r- WOCV WSEL 100 -YEAR RESTRICTOR ORIFICE PLATE PLATE (3/8" MIN. HOT -DIPPED GALVANIZED) OUTLET PIPE 12" MIN. 100 -YEAR RESTRICTOR ORIFICE PLATE PLATE (3/8" MIN. HOT -DIPPED GALVANIZED) OUTLET PIPE 12" MIN. //v )v //\///\\.- /x/ /\\/\\ // // // /), /\> \‘‘. SECTION B -B' 5.10.2.4 Stage Storage Curves A relationship between the water surface elevation and detention basin volume, commonly referred to as a "stage -storage" curve, needs to be developed for each pond. The afore mentioned MHFD spreadsheet will calculate a stage -storage table based on overall pond dimensions, however the County WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A L' L 169 requires the cage -storage volumes be based on the actual site design contours. The volumes may be calculated in tie "Basin" tab of the spreadsheet by using the "Surface Area at Stage (ft2) override" column or by using the equation below. Another meth xd of calculating the stage -storage volume is called the "Conic" method and is based on the following formula: Where: V = n(A+B+\IAB) V= Volume between two contours, ft3 D= DE pth between contours, feet A = Ar-2a of bottom contour, ft2 B= Area of top contour, ft2 Eq. 5.10.2.2 A cumulative volume should be provided for the progressing stages/depth of the pond. The required pond volume f:- water quality and detention should be compared to the available pond volume provided in the design. The information should be clearly shown in the project's drainage report. 5.10.2.5 Spillway Detention pon is and stormwater infiltration facilities (retention ponds) shall contain an emergency spillway capab e of conveying the peak 100 -year storm discharge (from developed site) draining into the pond/infiltration facility. The spillway also should be capable of passing any off -site flows that are routed through the pcnd un-detained. The spillway location should be placed so that downstream properties or residences are not adversely affected. The invert of the emergency spillway must be equal to or above the 100 -year WSEL. The elevation of the top of the embankment should be a minimum of 1 foot above the water surfEce elevation when the emergency spillway is conveying the maximum design or emergency flmv. The depth of flow over the emergency spillway shall be 6 inches or less. Additional spillway details are shown in Appendix J. Flow over a ro -izontal spillway can be calculated using the following equation for a horizontal broad - crested weir, shown below. Where: Q = CecwLH1.5 Eq. 5.10.2.3 Q= Cis:ha rge, cfs CBCW = Broad -crested weir coefficient, dimensionless (ranges from 2.6 to 3.0) L= LenP._hofweir, ft 11= head above weir crest, ft In addition, the County requires the following items be included in the spillway design. • A concrete cutoff wall 8 inches thick, 3 feet deep, and extending a minimum of 5 feet into the emban client on each side of the emergency spillway opening is required on all privately mainta ned detention ponds/infiltration facilities and regional detention ponds/infiltration WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 70 facilities. The concrete cutoff wall permanently defines the emergency spillway opening. The emergency spillway elevation shall be tied back into the top of the embankment using a maximum slope of 4:1. • To protect the emergency spillway from catastrophic erosion failure, riprap shall be placed from the emergency spillway downhill to the embankment toe of slope, with a toe -down constructed to a depth of 4xD50. The minimum D50 for riprap on the emergency spillway shall be 12 inches (Type M). Riprap may be either grouted or buried. If buried, the protected area shall be covered with 6 inches of topsoil and seeded. Revegetation requirements for storage facilities can be found in Chapter 8 of this WCECC. A detail of the preferred spillway design is in Figure 5-11 below. Figure 5-11 Emergency Spillway Typical Design EMERGENCY SPILLWAY 1' MINIMUM I- I 3' WQCV WSEL wQcv ORIFICE PLATE r-5' MAXIMUM SLOPE OF 4.1 FRONT VIEW 100 YEAR WSEL OR HIGHER 6" MAXIMUM - FLOW OVER SPILLWAY VARIES - V MINIMUM --•---0--�r---T-- t^...Sliallitagi _.-. • f • . •�a ' 4 ' a • '- J . . • f • • �' -a j • . • • -41 Imps -- 1 • • rpmf..a T midi — Alio dmr — — ww•w t.— ... w... 4. r...Tr �.. j' - dm. r OVERTOPPING SPILLWAY WATER SURFACE 100 YEAR WSEL SAFETY GRATE - 6' MAX 8" MINIMUM THICKNESS EMERGENCY SPILLWAY WALL 100 -YEAR RESTRICTOR PLATE CONCRETE CUTOFF WALL EMERGENCY SPILLWAY REQUIREMENTS OUTLET PIPE MINIMUM SIZE 12" CONCRETE CUTOFF WALL SIDE VIEW z TWO #5 BARS COMPACTED EARTH 95% STANDARD PROCTOR DENSITY BURIED OR GROUTED RIPRAP (DEPTH = 2 x PLACED TO TOE OF SLOPE GEOTEXTILE FABRIC MIRAFI FW 3OO OR APPROVED EQUAL LOW TAILWATER BASIN IF VELOCITY EXCEEDS 2 FPS HEADWALL AT END OF PIPE EACH DETENTION POND SHALL CONTAIN AN EMERGENCY SPILLWAY CAPABLE OF CONVEYING THE PEAK 100 -YEAR STORM AT A DEPTH OF SIX (6) INCHES OR LESS. BURIED OR GROUTED RIPRAP SHALL BE PLACED FORM THE EMERGENCY SPILLWAY DOWNHILL TO THE EMBANKMENT TOE OF SLOPE AND COVERED WITH SIX (6) INCHES OF TOPSOIL. IF BURIED. THE RIPRAP MUST BE SIZED AT THE TIME OF FINAL ENGINEERING DESIGN. GROUTING OF THE RIPRAP MAY BE REQUIRED. - IN ORDER TO PREVENT DAMAGE TO PUBLICLY -OWNED INFRASTRUCTURE (ROADS, ROADSIDE DITCHES), A CONCRETE CUTOFF WALL EIGHT (8) INCHES THICK. THREE (3) FEET DEEP, AND EXTENDING A MINIMUM OF FIVE (5) FEET INTO THE EMBANKMENT ON EACH SIDE OF THE SPILLWAY OPENING IS REQUIRED ON ALL DETENTION PONDS. THE EMERGENCY SPILLWAY ELEVATION MUST BE TIED BACK INTO THE TOP OF THE EMBANKMENT USING A MAXIMUM SLOPE OF 4:1. - CONCRETE SHALL BE CDOT CLASS D. 4500 PSI IN 28 DAYS. PER CDOT SPECIFICATION SECTION 601. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGL 171 5.10.2.6 Maintenance Maintenance 'or stormwater storage facilities should follow the recommendations in the USDCM, Volume 3, unless otherwise specified by the design engineer. It is recommended that stormwater infiltration facilities be scraped/plowed every few years to prevent sedimentation and/or clogging and to ensure proper infiltration is being achieved. Areas designated for stormwater drainage, detention, or stormwater infiltration, are not to be used for materials storage, building, or parking, and should not be modified without approval from the Department of Public Works. Access also must be provided to the drainage facili-ies for long-term maintenance. Refer to Section 5.3.1 of this WCECC for O&M submittal requirements. 5.10.2.7 Exceptions to Detention Requirements Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property. The following exceptions are provided in Chapter 8, Article XI, of the Weld County Code and are subject to updates: • Use by right or accessory use in the A (Agricultural) Zone District • Zoning permits for accessory storage, commercial vehicles, home occupations, or manufactured homes in the A (Agricultural) Zone District • A second dwelling permit in the A (Agricultural) Zone District • Tower;, including but not limited to wind and telecommunication towers • Pipe Ines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances • Gravel pits, if the stormwater drains into the gravel pit. Releases from the site shall comply with this Engineering and Construction Criteria Manual, including dewatering. Topographical information will be provided. • Rural residential developments with no historic flooding, where all the following conditions exist. This exception shall be supported by calculations provided by the Applicant. Additional information may be requested and will be signed and stamped by a Colorado licensed Professional Engineer: a. Nine (9) lots or fewer. b. The minimum lot size is equal to, or greater than, three (3) acres per lot. c. The total post -development imperviousness for the rural residential development does not exceed ten percent (10%), assuming that all internal roads and driveways are paved. • Development of sites where the change of use does not increase the imperviousness of the site. Note: This exception cannot be applied to sites where impervious surfaces were added for, or in conjun :tion with, a business that is/was operating in violation and/or without the required Weld County land use permit. • A parcel of land or project site where the "total developed stormwater runoff" from the 100 - year, 1 -hour storm is less than, or equal to, five (5) cfs. The "total developed stormwater runoff" includes cumulative runoff from the proposed project site plus runoff from any previously developed project site on the subject parcel. A project site is the area of land that lies witiin the project's limits of disturbance during construction. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer. • In -fill development parcels with total area less than, or equal to, one (1.0) gross acre. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE I 72 • An individual parcel with an unobstructed flow path and no other parcel(s) between the channel within a Federal Emergency Management Administration (FEMA) regulatory floodplain and the project • A parcel greater than one (1) gross acre and less than, or equal to, five (5) gross acres in size is allowed a one-time exception for a new four thousand (4,000) sq. ft. building or equivalent imperviousness. • A parcel > 5 gross acres in size is allowed a one-time exception for a new 4,500 sq. ft. of 100% impervious area or equivalent imperviousness. • A parcel greater than five (5) gross acres in size is allowed a one-time exception for a new nine thousand (9,000) sq. ft. of 100% imperviousness area or equivalent imperviousness. • Concentrated Animal Feeding Operations (CAFOs), Animal Feeding Operations (AFOs), and Housed Commercial Swine Feeding Operations (HCSFOs) which are covered and approved by the Colorado Discharge Permit System (CDPS) regulations. Portions of the site not included or covered by the CDPS permit shall comply with the criteria set forth in this Chapter. Exception requests shall be supported with an approved drainage narrative, which must describe the following minimum criteria: • The exception being requested for consideration. • Any existing and proposed improvements to the property. • Where the water originates if it flows onto the property from an offsite source. • Where the water flows as it leaves the property. • The direction of flow across the property. • Previous drainage problems with the property, if any. • The location of any irrigation facilities adjacent to or near the property. • Any additional information pertinent to the development. During the review of the application, the Weld County Department of Planning and Zoning will determine if the exception is applicable and will not jeopardize the health, safety, and welfare of public and private property. 5.10.3 Dam Information All detention ponds shall be evaluated to verify if the detention facility would be classified as a non - jurisdictional or jurisdictional dam, per the State of Colorado Department of Natural Resources criteria. Refer to Table 5-16. Table 5-16 Non -Jurisdictional vs Jurisdictional Dam Criteria Summary Non -Jurisdictional Dam Jurisdictional Dam Jurisdictional Height of Berm < 10 ft > 10 ft Water Line) Storage Area (at High Water < 20 ac > 20 ac Water Storage Volume < 100 ac -ft > 100 ac -ft *This table is a general summary of the required State Criteria. The Designer shall be required to determine which category their design would be classified as and determine the required protocol. This information will then be supplied to the County for record keeping purposes. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PG r. 173 If it is determi ied that the detention facility is classified as a jurisdictional dam, state procedures must be followed. It should be noted that non -jurisdictional -size dams are regulated and subject to the authority of the State Engineer consistent with Sections 37-87-012 and 37-87-105 C.R.S., Implemental is of detention ponds, and will require the design engineer to consult with the State Engineer's Off ce to verify the legal right to store water. 5.10.4 Irrigation Ditches/Private Irrigation Systems It is not the intent to allow new private irrigation systems to be located within County right-of-way. Irrigation ditches shall not be used as conveyance systems and/or outfall points for stormwater runoff for all land use cases including, but not limited to: Uses by Special Review, Site Plan Reviews, Subdivisions, cr Planned Unit Developments, unless such use is approved, in writing, by the ditch owner(s). The approval shall be in the form of signature on the construction plans/documents or other formal legal ageements as required by the ditch company or owner. Should direct discharge of stormwater ru noff be permitted, water quality treatment may still be required. In the instance where an irrigation ditch serves as the outfall for a stormwater detention facility, the following item ; must be met: • The maximum water surface elevation must be determined based on the maximum amount of irrigati :in flow in the ditch. The appropriate owner/ditch or reservoir company is the determining authority regarding the maximum irrigation flow in the ditch. Written verification of the ma mum irrigation flow from the owner/ditch or reservoir company must be submitted with the hydraulic analysis of the ditch water surface elevation. • The detention outlet must be designed such that backflow from the ditch into the detention facility is prevented. • The ba:kwater effects caused by the design of a detention outlet, if any, must be reviewed and approved by both the County and the appropriate ditch or reservoir company. • The outlet design must consider tailwater effects on the outlet pipe resulting from the combir ation of the maximum irrigation flow and the 100 -year storm discharge within the ditch. • Drain t mes need to adhere to Colorado Revised Statute 37-92-602 (8) drain time requirements as lister in the "Detention Pond" section of this document. If new develop vents are adjacent to irrigation facilities but no flows are being directed into the ditch, the owner/ ditc h or reservoir company must still be notified of the proposed development. In such cases, it shall b the developer's engineer responsibility to provide drawings and calculations to support the fact the irri ration ditch is not impacted. These drawings and calculation shall be supplied to the County and ditcn company owner. The party seeking modifications to existing ditch conditions must obtain the appropriate owner/ ditch or reservoir corioany approvals and signatures prior to seeking Weld County approval for such modifications. The party seeki -ig modifications to the existing irrigation facilities must coordinate with the irrigation system owner/operator to provide an adequate design to make the irrigation system function as it did prior to the imr rovements. When modifications to existing irrigation systems are necessary, the following must oe provided to the County review staff: WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 174 • Information on how the existing private irrigation facilities are to be protected or routed through the project site. • Plan and profile drawings of any new irrigation pipes should be included in the drawing set, similar to information for proposed storm lines. • A hydraulic model showing the irrigation pipe system at full irrigation flows should be provided in the drainage report for review by County staff. • Irrigation flows should be provided by the owner of the irrigation system, not estimated on existing pipe or ditch sizes. • Details of any irrigation structures required should be provided in the plan set for the development. Dimensions of the structures, concrete type and thickness, rebar type and spacing, grates, weir boards, bridge, trash racks, connecting hardware, air vents etc. should be included in the details of the irrigation structures. • Owner approval of the new system is required before construction can proceed. • Proposed private irrigation facilities for new developments or reconfigured existing irrigation systems should be located outside of the public right-of-way. As -built survey is required documenting all changes in direction and structure critical elements plus video of all pipes installed verifying pipe connections and debris removal. 5.11 STORMWATER DRAINAGE CRITERIA VARIANCES In cases of hardship, an applicant may apply for a variance from a requirement of the storm drainage criteria. Weld County will not approve design variances found to be detrimental to the public health, safety, and general welfare or when the request is contrary to the purpose and intent of the criteria set forth in this document or the Weld County Code. The variance procedure is intended to address cases of hardship, and requests will not be granted when the hardship is brought about solely through the actions of the appellant. Variance requests shall be stamped and signed by a professional civil engineer licensed to practice in the State of Colorado and shall be submitted with the Certificate of Compliance. Variance requests will be reviewed by the Development Review Engineer. To be reviewed, the variance request must: • State the hardship that is causing the request for a variance from Weld County Code. Provide proof of the hardship in the drainage memo/letter provided. • Describe the design criteria of the Weld County Code from which a variance is being requested. • Describe the proposed alternative with engineering rationale that supports the intent of the Weld County Code. • Meet the design intent of the Weld County Code. • Demonstrate that granting of the variance will still adequately protect public health, safety, and general welfare. • Demonstrate there are no adverse impacts from stormwater runoff to the public rights of way and/or offsite properties as a result of the project. Applicants may appeal the denial of a variance to the BOCC pursuant to the provisions in Chapter 2, Article IV, Section 2-4-10 of the Weld County Code. Variance requests, if accepted, are not precedent setting and are based on site -specific constraints. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P u E 175 5.12 OIL AND GAS STORMWATER MANAGEMENT The following standards apply only to the development of oil and gas exploration and production in the Weld Mineral Resource (Oil and Gas) Area. These standards shall be supported by calculations signed and stamped pv a Colorado licensed Professional Engineer and accepted by the Weld County Department cf Public Works. See also Chapter 21 of the Weld County Code. • Oil an I Gas Tank battery secondary containment. When calculating the Oil and Gas Location imperviousness and pervious areas, secondary containment areas may be excluded from the total site imperviousness and pervious calculations provided that the secondary containment area is appropriately sized to hold the originally designed safety containment volumes plus the 100 -year, 1 -hour storm rainfall event. • Detention pond storage volume. In non -urbanizing areas during the Construction Phase, detention ponds shall be sized to store the stormwater runoff generated by the 1 -hour, 100 - year s_orm falling on the developed site and release of the detained water at the historic runoff rate o- the 1 -hour, 10- year storm falling on the undeveloped site or at 5 cfs, whichever is greater. Historic is defined as an undeveloped site (before any development) with an assumed 2.0 pet:ent imperviousness maximum. During the Production Phase or in urbanizing areas, detention ponds shall adhere to Sec. 8-11-100.A.1. of the Weld County Code. • Detention pond freeboard. During the Construction Phase, less than 1 foot of freeboard may be allowed on a case -by -case basis. This exception shall be supported by calculations signed and stamped by a Colorado licensed Professional Engineer and accepted by the Weld County Department of Public Works. During the Production Phase, the detention pond shall adhere to Sec. 8-11-100.A.4 of the Weld County Code. • Emergency spillway. To prevent damage to publicly owned infrastructure (roads, roadside ditches), a cutoff wall is required on all privately maintained detention ponds and retention ponds The cutoff wall permanently defines the emergency spillway opening. The emergency spillway elevation must be tied back into the top of the embankment using a maximum slope of 4:1. The cutoff wall must either be constructed of concrete or galvanized steel sheet pile. Concrete cutoff walls must adhere to Sec. 8-11-100.A.7 of the Weld County Code. Steel sheet pile cu _off walls must be hot dipped galvanized steel of %-inch thickness or 3 -gauge and extend 3 feet Delow the bottom of the pond or per manufacturer's recommendation, whichever is greate-. If steel sheet pile is proposed for the cutoff wall, the native soils must be tested for sulfate levels. If the sulfate levels are above 1.0 percent, the sheet pile shall be coated with a corrosion -resistant epoxy. • Retent cn pond. Retention facilities shall be allowed without a variance only during the Construction Phase. Retention facilities that are proposed for the Production Phase require the issuance of a variance requested by the Applicant and accepted by the Weld County Department of Pub is Works. Additionally, as part of the application for a 1041 WOGLA Permit, an Operator shall provide proof of a valid stormwater discharge permit issued by CDPHE. The Operator shall submit a drainage report to comply with re iuired Storm Drainage Criteria pursuant to Chapter 8, Article XI of the Weld County Code. Additional regL irements for Municipal Separate Storm Sewer System (MS4) areas may be applicable pursuant to Chapter 8, Article IX of the Weld County code. WELD COUNT-_' ENGINEERING & CONSTRUCTION CRITERIA PAGE f 76 CHAPTER 6 GRADING AND MS4 REQUIREMENTS 6.1 EROSION CONTROL AND GRADING REQUIREMENTS Weld County requires an erosion control and grading plan. Erosion control methods are implemented to prevent the offsite transport of sediment from land- disturbing activities. Erosion has the potential to damage adjacent properties and County drainage systems, as well as contributing to the degradation of water quality. When properly installed and maintained, temporary control measures provide effective erosion control for a site. At a minimum, a stormwater management plan (SWMP) shall include erosion control and grading plans. 6.1.1 Applicability Sites disturbing more than one acre (Sec. 8-12-30.B) of land disturbance require a Grading Permit. For MS4 areas a grading permit may be required for any disturbance. The definition of disturbance in the Weld County Code is when the surface area is disturbed by any work activity upon the property by means including, but not limited to, grading; excavating; stockpiling soil, fill, or other materials; clearing; vegetation removal; removal or deposit of any rock, soil, or other materials; or other activities that expose soil. Disturbed area does not include the tillage of land that is zoned agricultural or the tillage of a parcel zoned PUD (planned unit development) within the area identified for agricultural uses. For Grading Permit exemptions, refer to Section 8-12-30 of the Weld County Code. 6.1.2 Grading and Erosion Control Plans When applying for a Grading Permit, a Grading Plan, a Utility Map (Sec. 8-12-50.C), a Drainage Plan and a Sediment & Erosion Control Plan shall be submitted for review. A Grading Permit Checklist, provided in Appendix G, should be used for guidance in developing the Grading Plan and Sediment & Erosion Control Plan to expedite the review process. The main components of the Grading Plan and Sediment & Erosion Control Plan are: 1. Site Drainage identifying existing and proposed grading and drainage features (swales, inlets, manholes, curb and gutter, concrete pans, culverts, roof drains, ponds, and outlet structures) designed to convey stormwater runoff. Site grading will be consistent with accepted Drainage Plan for the site. 2. Temporary Control Measures (BMPs) identifying, detailing, and locating all structural and non- structural temporary control measures used during each phase of construction, from initial disturbance to final stabilization, to prevent the discharge of sediment from the site. Additionally, the plan will include installation, implementation, maintenance, and removal specifications for each structural control measure and a narrative description of each non- structural control measure. 3. Permanent Stabilization —identifying the means and methods used to achieve stabilization for all disturbed areas. Stabilization includes, but is not limited to; seed mix, seed application method, mulch type, mulch application method, soil testing, soil amendments, and erosion control blankets. Additionally, the plan will include installation, implementation, and maintenance specifications for each structural control measure and a narrative description of each non-structural control measure. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A r. I 77 A complete se: of plans will include separate plan sheets for all three phases of construction identified as follows: 1. Initial 3hase—depicting current site conditions, including existing structures, drainage patterns, topography, etc. 2. Interim Phase —depicting temporary control measures used during active construction. Depend 'ng on construction phasing, multiple sheets may be required. At a minimum, vehicle trackirg, perimeter control and inlet/outlet protection will be addressed with temporary control measures. In addition, the plans should note that a state -issued Dewatering Permit will be obtained and submitted to Weld County prior to any dewatering activities. 3. Final P-.3se—depicting temporary control measures to remain in place after construction until the site reaches final stabilization. Final stabilization is when all landscaping is complete, and seeding has reached at least 70 percent permanent vegetative cover. At a minimum, perimeter cont-o will remain in place and maintained until final stabilization is reached. In addition, other temporary control measures may be required to remain in place and maintained, if necessary, to prevent offsite sediment transport while waiting for vegetative growth. Plan sheets will be submitted electronically and should be clear and legible. The Development Review Engineer reserves the right to require plan modifications for readability purposes. In addition, each temporary control measure used will be located on the applicable site plan and referenced in the legend, and an installation and implementation specification will be attached. Public Works recommends using USDCM Volume 3, Chapter 7, Construction BMPs, for clear and specific installation and implementation specifications. Other methods may be approved on a case -by -case basis. 6.1.3 Imple-rTentation During constru :tion, the Grading Plan, Utility Map, Drainage Plan and Sediment & Erosion Control Plan shall be kept onsite and available for reference by site workers and County inspectors. In accordance with the state- issued Construction Permit, temporary control measures should be inspected by a Qualified Sto'mwater Manager at a minimum of every two weeks and after storm runoff events; however, more frequent inspections may be necessary to properly maintain temporary control measures. If changes to the approved Grading Plan and Erosion & Sediment Control Plan are necessary, Weld County shall be :ontacted to determine if a Grading Permit modification is necessary. Weld County inspectors shal Verify site conditions with the approved set of plans. Violations may occur if site conditions dc rot reflect the approved plans. 6.1.4 Grading Permit Deadline (Fee) & Extension Grading permit) are a construction permit and are good for a 12 -month period from issuance. Final permit closecu: requires a minimum of 70% vegetative cover over the disturbed area. If construction is n ot complete a id/or vegetative cover is not established prior to the one-year expiration date an e xtension to the permit will be required. Apermit extension fee may be required if the applicant has n ot established substantial or final completion as determined by County staff inspections of the site. Substantial completion, at the sole discretion of the County, could be granted if the construction timeline did ro: provide the opportunity for the site to get through an entire and proper growing season. WELD COUNT`' ENGINEERING & CONSTRUCTION CRITERIA PAGE 78 6.1.5 Tracking Control Tracking control is required when construction activity is accessing onto a roadway surface other than gravel. There are three tracking control options when required to mitigate impacts to the public road, including damages and/or offsite tracking of mud or other materials. Regardless of option, drainage and/or culverts must be maintained. The associated appropriate tracking control devices for each situation are listed below. • Permanent access onto concrete, asphalt, or recycled asphalt (RAP) public road a. Double cattle guards used in combination with 100 feet of asphalt b. Or 300 feet of asphalt • Permanent access onto gravel public road a. Double cattle guards with 100 feet of aggregate surface course (See Section 9.6.6) b. Or 300 feet of aggregate surface course (See Section 9.6.6) c. Aggregate surface course (See Section 9.6.6) on all drive surfaces • Temporary access onto either concrete, asphalt, or recycled asphalt (RAP) or gravel public road. Culverts or accepted drainage report may be required for temporary access control pads. a. County accepted prefabricated tracking pad b. Aggregate with base and a minimum of 70 feet long (per Error! Reference source not found.6-1) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA i 79 Figure 6-1 Tracking Control for Temporary Accesses I EXISTING GROUND B NOTES: 15' M I N ` SHALL EXTEND FULL WIDTH OF INGRESS AND EGRESS OPERATION PLAN VIEW 70" MIN. 7 6" MIN MIRAFI FW300 GEOTEXTILE OR EQUIVALENT ELEVATION SECTION SECTION B -B MIRAFI FW300 GEOTEXTILE OR EQUIVALENT 1. AGGREGATE SHALL CONFORM TO CDOT SPECIFICATIONS, SUBSECTION 208 2. THE CONTRACTOR SHALL PROTECT CURB AND GUTTER, EDGE OF PAVEME OF GRAVEL ROAD THAT CROSSES OR IS ADAJACENT TO THE ENTRANCE FR( WHILE NOT BLOCKING FLOW OF WATER. IN THE CASE THERE IS AN EXISTING CULVERT IS REQUIRED. PROTECTION OF THE ADJACENT ROADWAY MATERIAL: ABOVE SHALL BE INCLUDED IN THE COST OF THE WORK AND NOT PAID FOI 3. ALL MATERIALS AND LABOR TO COMPLETE THE VEHICLE TRACKING PAD INCLUDED IN THE COST OF THE WORK AND NOT PAID FOR SEPARATELY. 4. THE PAY ITEM NUMBER FOR VEHICLE TRACKING PAD (EACH) IS CDOT ST SPECIFICATION 208-00070. EXISTING PAVEMEN T OR GRAVEL ROAD (DEPTH VARIES) WELD COUNTY/ ENGINEERING & CONSTRUCTION CRITERIA PAGE I 80 6.2 MS4 REQUIREMENTS Sites located in Weld County's state -permitted Municipal Separate Storm Sewer System (MS4) area are required to comply with the Grading Permit requirements as well as additional MS4 requirements. Weld County is categorized as Phase II. An MS4 is a conveyance or system of conveyances that is: • Owned by a state, county, city, town, or other public entity that discharges to waters of the United States • Designed or used to collect or convey stormwater (including storm drains, pipes, ditches, etc.) • Not a combined sewer • Not part of a publicly owned treatment works (sewage treatment plant) EPA's Stormwater Phase II Rule established a management program that is intended to reduce the quantity of pollutants that enter MS4s from stormwater. Common pollutants include oil and grease from roadways, pesticides and fertilizers, sediment from construction sites, and discarded trash. When deposited into nearby waterways through MS4 discharges, these pollutants can impair the waterways, discourage recreational use, contaminate water supplies, and interfere with the habitat for aquatic organisms, fish, and wildlife. In compliance with the provisions of the Federal Water Pollution Control Act (commonly referred to as the Clean Water Act), as amended (33 USC 1251 et seq.), the EPA promulgated rules establishing Phase I of the NPDES stormwater program in 1990. The 1990 Phase I program requires operators of medium and large MS4s (defined as those serving populations of 100,000 or greater) to implement a stormwater management program to control pollution. State law has similar provisions (Colorado Water Quality Control Act, CRS 25-8-101 et seq). The 1999 Stormwater Phase II Rule extended coverage of the NPDES stormwater program to certain "small" MS4s in urbanized areas (those serving populations of 10,000 to 100,000). Small MS4s located in urbanized areas are defined by the Census Bureau based on the most recent Census. New urbanized areas will be identified in each subsequent Census, occurring every 10 years. Generally, Phase I MS4s are covered by individual permits, and Phase II MS4s are covered by a general permit. Each regulated MS4 is required to develop and implement a program to reduce the contamination of stormwater runoff and prohibit illicit discharges. Operators of small MS4s are required to design their programs to reduce the discharge of pollutants to the "maximum extent practicable." In Colorado, the program is administered by the Colorado Department of Public Health & Environment (CDPHE) Water Quality Control Division. (The Colorado program is referred to as the Colorado Discharge Permit System, or CDPS, instead of NPDES.) 6.2.1 Designated MS4 Areas and Responsibilities The MS4 mapped areas are reviewed annually by Weld County and are designated by CDPHE based on population density. Currently, MS4 municipalities in Weld County include Greeley, Evans, Windsor, Firestone, Erie, LaSalle, Brighton, Longmont, and a small portion of Northglenn and Thornton. As Weld County continues to grow in population, each of these MS4 areas will continue to expand, potentially encompassing urbanized parts of Frederick and Dacono. The MS4 permit requires the County to implement a Construction Sites Program to prevent the discharge of pollutants to the MS4 from applicable construction activities. The MS4 permit also requires WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAUE I 81 a Post -Constriction Program to treat stormwater runoff from applicable development sites. These responsibilities are handled through coordination between the departments of Planning and Public Works. 6.2.2 Appli Lability of MS4 Requirements The MS4 Permit mandates specific requirements for construction activities resulting in a land disturbance of greater than or equal to one (1) acre. The same requirements apply to land disturbance that is less thai one (1) acre but is part of a larger common plan of development or sale with a planned disturbance of greater than or equal to one acre. For subdivisions, planned disturbance is equal to the cumulative po-ential development area as specified by Chapter 23 of the Weld County Code and/or the Master Drainage Plan for the subdivision, if more restrictive. The MS4 Permi: defines construction activity as ground -surface -disturbing activity, which includes, but is not limited to, c earing; grading; excavation; demolition; and installation of new or improved haul roads, access roads, staging areas, stockpiling of fill materials, and borrow areas. Activities that include routine maintenance tp maintain original line and grade, hydraulic capacity, or original purpose of the facility are not considered construction activities. Activities to conduct repairs that are not part of regular maintenance and activities that are for replacement are considered construction activities and are not considered routine maintenance. Repaving activities where underlying or surrounding soil is cleared, graded, or excalJated as part of the repaving operation are construction activities unless they are an excluded site under Part I.E.4.a.i. of the permit. 6.2.3 Required Permits 6.2.3.1 CDPS Construction Stormwater Permit When construction activities result in land disturbance of one (1) acre or more, or less than one acre but part of a larger common plan of development, the owner and operator must obtain a CDPS Construction Stormwater Permit, issued by CDPHE, prior to the start of land- disturbing activities. Under certain conditions, an 3 -Factor waiver may be obtained from CDPHE. As part of the permit, a Stormwater Management Plan (SWMP) must be kept onsite at all times. Additionally, the site must have a Qualified Stormwater Manager (QSM), a person knowledgeable about stormwater requirements and capable of implementing the SWMP in its entirety. Refer to the CEPHE website for more information on the CDPS Construction Stormwater Permit, R - Factor Waiver, and a SWMP preparation guidance document. 6.2.3.2 CDPS Construction Dewatering Permit When construction activities require dewatering, the owner and operator must obtain a CDPS Construction Dewatering Permit, issued by CDPHE, prior to the start of dewatering activities. Under certain conditiors, as specified in CDPHE's Low Risk Discharge Guidance for Discharges of Uncontaminat€c Groundwater to Land, a dewatering permit may not be required. However, if the dewatering act vity is not complying with the guidance document and/or there is a threatened discharge of pollutants tc the MS4, the Department of Public Works will issue a Stop Work Order until a CDPS Construction Dewatering Permit is obtained and the threatened discharge no longer exists. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 182 Refer to the CDPHE website for more information on the CDPS Construction Dewatering Permit and CDPHE's Low Risk Discharge Guidance for Discharges of Uncontaminated CDPHE's Low Risk Discharge Guidance for Discharges of Uncontaminated Groundwater to Land. 6.2.3.3 Weld County Grading Permit When construction activities will result in land disturbance of one acre or more, or less than one acre but part of a larger common plan of development, the owner or operator must obtain a Grading Permit, issued by Weld County, prior to the start of land -disturbing activities. In some cases, when disturbing less than one acre within a developing subdivision, a Grading Permit may be required depending on other construction activities in the area. Additionally, a Grading Permit may be required for sites not located within the MS4 area but discharge into an MS4 drainage system. Exemptions to the Grading Permit do not apply to properties located within the MS4 area, and variances to MS4 requirements will not be granted. 6.2.4 MS4 Requirements for Pre -Construction The following requirements apply to any applicable development or construction activity within the MS4 area. This includes the resubdivision of land since it is considered a "larger common plan of development." The Department of Public Works will review each case and determine the applicability of the site and if any exclusions are approved (see Post -Construction exclusions below). 6.2.4.1 Site Plan Review The following documents shall be submitted, reviewed, and accepted by Weld County staff prior to any applicable construction activity requiring a Grading Permit. In addition, construction activity not requiring a Grading Permit may be required to submit applicable documents if determined necessary to comply with MS4 requirements. 6.2.4.2 Drainage Report Drainage Reports shall be signed and stamped by a Colorado licensed Professional Engineer. A Drainage Report Checklist, provided in Appendix B, should be completed and submitted with the report. The four main components of the Drainage Report relating to MS4 requirements are: a. General Content describing the nature of the development, basic characteristics of the site, and proposed drainage improvements designed to comply with Weld County drainage and MS4 requirements. This includes specifying the MS4 "Base Design Standard" used in the design of the permanent water quality control measure. b. Hydrology and Hydraulic Analysis —including the calculations, narratives, and design details for permanent structural control measures and associated drainage features to show compliance with the MS4 Permit's "Base Design Standards." c. Construction Drawings —detailing the existing and proposed drainage, permanent water quality control measure(s) to be installed, and specifications for structural components. d. Long -Term Operations and Maintenance Plan —for permanent water quality control measures and associated drainage features. The plan shall include frequencies of inspections and maintenance and narratives for non-structural control measures, if applicable. Refer to USDCM Volume 3 Chapter 6 for guidance on maintaining permanent water quality control measures. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r t- U L. 183 When designing a permanent water quality control measure and developing maintenance procedures, Public Works will conduct routine inspections for the life of the control measure to ensure proper functioning and adequate maintenance is being performed. Inspections generally occur every year; however, some sites may qualify for inspections every five years based on factors such as the control measure type/design, facility type, pollutant load, and historical compliance. If there are no structural components to visually confirm volume capacity, such as a concrete trickle channel, micro -pool, or forebay, a survey conducted by a Professional Land Surveyor may be required. Additionally, a Colorado licensed Professional Engineer shall provide confirmation of the existing volume capacity meet ng the approved Drainage Report calculations. The survey and report may be required to be submitted &very five years for the life of the facility. 6.2.4.3 Grading and Sediment & Erosion Control Plans Grading and Sediment & Erosion Control Plans shall be signed and stamped by a Colorado licensed Professional Engineer. A Grading Permit Checklist, provided in Appendix G, should be used in developing plans to expedite the review process. For details, refer to Section 6.1. The main components of the Grading Plan and Sediment & Erosion Control Plan have been identified in Section 6.1.2 above. 6.2.4.4 MS4 Pollution Prevention Plan The MS4 Pollution Prevention Plan Checklist and Manual is available in Appendix H. The checklist shall be completed and submitted with the plan. The manual contains County -approved installation and maintenance sQecifications for temporary control measures. Specifications for proprietary temporary control measures, such as concrete washout structures and vehicle tracking pads, shall be submitted and approved prior to use. The MS4 Pollution Prevention Plan Checklist and Manual was developed to help the Qualified Stormwater Manager (QSM) with implementation of structural and non- structural temporary control measures used curing each phase of construction, from initial disturbance to final stabilization, to prevent the discharge of pollutants from the site. It is the QSM's responsibility to identify all potential pollutants onsite and to implement temporary control measures for each pollutant. A list of potential pollutants include: • Vehicle tracking of sediments • Land disturbance and storage of soils • Loading and unloading operations • Outdoor storage of construction site materials, building materials, fertilizers, and chemicals. • Bulk storage of materials • Vehicle/equipment maintenance and fueling • Significant dust- or particulate -generating processes • Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, and oils • Concrete truck/equipment washing, including the chute and associated fixtures and equipment • Dedicated asphalt/concrete batch plants or masonry mixing station WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 184 • Waste sources such as sanitary waste, construction site waste, and worker trash • Other non-stormwater discharges, including construction dewatering or power washing • Other areas or operations where spills can occur (if so, specify) 6.2.4.5 Future Development For developments not requiring a Grading Permit, such as a re -subdivision of land or phased construction sites, MS4 requirements remain applicable. If no land -disturbing activities are planned, the applicant may only be required to submit a Drainage Report, including, but not limited to, the design of a permanent water quality feature and associated drainage features and a Long -Term Operation and Maintenance Plan. Upon commencement of land -disturbing activities, additional documents, such as a Grading Plan, Sediment & Erosion Control Plan, and MS4 Pollution Prevention Plan will be required. 6.2.5 MS4 Requirements for Construction Activity 6.2.5.1 Stormwater Inspections As required by the MS4 Permit, the County is required to routinely inspect construction sites at a frequency of at least every 45 days. The Department of Public Works maintains the authority to increase inspection frequencies based on historical violations. It is the responsibility of the applicant to contact the Department of Public Works to schedule the first inspection, at which time, the temporary control measures necessary to begin construction will be inspected (I.e. perimeter control and vehicle tracking control). The applicant shall provide notice a minimum of seven days prior to commencing construction activity. Failure to schedule an inspection is considered a violation of MS4 requirements, and a stop work order or other enforcement actions may be pursued. During routine inspections, the inspector shall review the current site conditions using the documents submitted during the review process. Significant changes in plans may require modifications to be submitted for approval. Minor changes should be noted in the Grading Plan and Sediment & Erosion Control Plan, MS4 Pollution Prevention Plan, or SWMP, which are to be kept onsite at all times. The inspector shall assess all onsite control measures, pollutant sources, and discharge points to determine if an illicit discharge has occurred or has the potential to occur. If violations are found, the applicant will be notified verbally, via email and/or certified mail, depending on the severity of the violations. A compliance inspection then will be scheduled no later than 14 days from the date of the violation. If violations are not corrected by the time of the compliance inspection, and a schedule for compliance is not being followed, escalating enforcement procedures shall be followed until the site reaches compliance. This may include a formal Notice of Violation (NOV), the issuance of a Stop Work Order and holding all permits for the site until violations have been corrected. If violations continue to exist, judicial enforcement responses may be pursued depending on the severity and recalcitrance of the violations. Refer to the Enforcement section below. Indicator (drive -by) inspections may be conducted at any time to assess site conditions. However, if violations are found during indicator inspections, the applicant will be contacted to remedy the violations and to schedule a follow-up compliance inspection. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 85 When construction activity is completed, inspections shall occur at least every 90 days until the site has reached final stabilization and all temporary control measures have been removed. If the contractor is no longer asst c ated with the site, the CDPS permit shall be transferred to the landowner, and the completed trarsfer shall be emailed to Public Works. A final walkthrough will be performed to release the Gradin g Permit. 6.2.5.2 Construction Enforcement Upon finding < stormwater violation that does not require emergency suspension, the inspector will verbally inforn the owner and/or operator of the necessary corrective action. If the violation is corrected during the inspection, no further action is required. For all remaining violations, the inspector will notify the owner and/or operator detailing the required corrective actions, and a follow-up compliance inspection will be scheduled. Depending on the severity of the violation, alternatives to the follow-up corm► iance inspection may be allowed, such as submitting photos of the corrective action. When the site reaches compliance, the routine inspection frequency will resume. If violations were not corrected by the follow-up compliance inspection, an NOV will be issued, specifying a date by which compliance must be obtained to avoid further enforcement action. If corrective acti ms are found adequate during the compliance inspection, the routine inspection frequency will resume. If the violations Detailed in the NOV were not corrected by the specified date, additional NOVs may be issued, in combi-iation with additional enforcement actions, such as Stop Work Orders and placing holds on permits. If compliance i; lot being achieved through previous methods, the Department of Public Works may decide to pursue an administrative entry and seizure warrant for abatement in addition to any potential civil and/or criminal enforcement. A hearing with the BOCC will be scheduled to assess the costs of the abatement, an i these costs will become a lien against the property from which the causes of violation have been rerreiiated. Additionally, if e County may, without prior notice, seek the suspension of MS4 discharge access, such as issuing a Stop Work Order, to stop an illicit discharge or threatened discharge which presents, or may present, immirent and substantial danger to the environment, to the health or welfare of persons or to any MS4 or wa :E rs of the state. If the violator fails to comply with a suspension order issued in an emergency, the Department of Public Works may take such steps as deemed necessary to prevent or minimize damEge to any MS4 or waters of the state. The BOCC may assess the costs of the abatement and such costs gill become a lien against the property from which the causes of violation have been remediated. A person commits an offense if the person reinstates access to the MS4 without prior approval of the Department of Public Works. For more inforrr 3tion on enforcement procedures, refer to Weld County Code Section 8-9. 6.2.6 MS4 Requirements for Post Construction When developing a site within the MS4 area, stormwater drainage shall be treated by use of a permanent walee quality control measure prior to discharging into any MS4. The MS4 Permit allows for several exemptcns; however, exemptions must be reviewed and accepted by Weld County staff prior to use. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 86 6.2.6.1 Exemptions The following exemptions are allowed in the MS4 area: 1. Large -Lot Single -Family Sites: A single-family residential lot, or agricultural zoned lands, greater than or equal to 2.5 acres in size per dwelling and having a total lot impervious area of less than 10 percent (10%). A total lot imperviousness greater than 10 percent (10%) may be allowed when a study specific to the watershed demonstrates the expected soil and vegetation conditions are suitable for infiltration/filtration of the WQCV for the site. The maximum total lot impervious covered under this exclusion shall be 20 percent (20%). 2. Undeveloped Land: Sites with land disturbance to undeveloped land (land with no human -made structures such as buildings or pavement) that will remain undeveloped. 3. Above Ground and Underground Utilities: Activities for installation or maintenance of underground utilities or infrastructure that does not permanently alter the terrain, ground cover, or drainage patterns from those present prior to the construction activity. This exclusion includes, but is not limited to, activities to install, replace, or maintain utilities under roadways or other paved areas that return the surface to the same condition. This list contains the most common exemptions, but other exemptions are listed in the MS4 Permit and may be allowed. All exemptions will be approved on a case -by -case basis. 6.2.6.2 Permanent Water Quality Control Measure Design Permanent water quality control measures must meet at least one of the "Base Design Standards" detailed in the MS4 Permit. No exemptions or variances to the standards are allowed for applicable development within the MS4 area. For the purposes of this section, the "permittee" is the landowner. The following italicized "Base Design Standards" were excerpted from the MS4 Permit, and all references made can be found within that document. The entire permit is available on the CDPHE website. 1. WQCV Standard The control measure(s) is designed to provide treatment and/or infiltration of the WQCV and: • 100 percent of the applicable development site is captured, except the permittee may exclude up to 20 percent, not to exceed 1 acre of the applicable development site area when the permittee has determined that it is not practicable to capture runoff from portions of the site that will not drain towards control measures. In addition, the permittee must also determine that the implementation of a separate control measure for that portion of the site is not practicable (e.g., driveway access that drains directly to street). • The exclusion of up to 20 percent of the site will be approved only in extreme cases when other forms of treatment are infeasible. Use of this exclusion will not be approved if flows can be diverted to the main permanent water quality control measure, or a separate permanent water quality control measure can be installed. It is the duty of the Engineer to demonstrate the hardship and prove that alternative methods cannot be employed. Cost in this case is not considered a hardship. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 87 Evaluation of he minimum drain time shall be based on the pollutant removal mechanism and functionality cf the control measure implemented. Consideration of drain time shall include maintaining vegetation necessary for operation of the control measure (e.g., wetland vegetation). Most commix ly, applicable development will require a detention pond, sized for the 100 -year storm event and rely sing within 72 hours, for flood control purposes. Detention ponds designed to current standards and rainfall data meet the WQCV Standard. However, if the site drains to a detention pond designed untie r previous standards and/or rainfall data that do not meet the WQCV Standard, a new permanent water quality control measure is required. Additionally, a permanent water quality control measure is rec uired even if a site qualifies for an exception to detention. In order to sic w compliance with this design standard, the plan must detail the percentage of the site is being captured and treated by the permanent water quality control measure. If there are any excluded areas propose J. a hardship must be demonstrated. Public Works will assess these on a case -by -case basis. Examples of permanent water quality control measures meeting the WQCV Standard include detention ponds (with orrice plates), bioretention (with underdrains), and sand filters (with underdrains). Calculations fcr the WQCV Standard can be found in the USDCM, Volume 3. 2. Runoff Reduction Standard The control rviE asure(s) is designed to infiltrate into the ground where site geology permits, evaporate, or evapotranspi.rc a quantity of water equal to 60 percent of what the calculated WQCV would be if all impervious ara for the applicable development site discharged without infiltration. This base design standard can Le met through practices such as green infrastructure. "Green infrastructure" generally refers to contra;` measures that use vegetation, soils, and natural processes or mimic natural processes to manage storm voter. Green infrastructure can be used in place of or in addition to low impact development principles. The Runoff Rec Lction Standard is most commonly used for sites qualifying for an exception to detention or sites drainirto a detention pond which was not originally designed to meet the WQCV Standard. Examples of permanent water quality control measures meeting the Runoff Reduction Standard include grass swales, g -ass buffers, bioretention (full infiltration), and sand filters (full infiltration). Calculations for the Runoff seduction Standard can be found in the USDCM, Volume 3. 3. Applicable Development Site Draining to a Regional WQCV Control Measure The regional VuCCV control measure must be designed to accept the drainage from the applicable development site. Stormwater from the site must not discharge to a water of the state before being discharged to he regional WQCV control measure. The regional WQCV control measure must meet the requirements cf the WQCV Standard listed above. The design engineer is encouraged to use guidance documents, spreadsheets and programs provided by MHFD to assist in designing the BMPs. Other software programs may be used, but the designs will be verified using tai MHFD spreadsheets. The most current versions of MHFD spreadsheets can be downloaded from the MHFD website at https:lfudfcd.org/software. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGF 88 Control measure technology is changing constantly. Weld County will evaluate the use of newly developed control measures on a case -by -case basis when complete documentation of all assumptions is provided. Weld County reserves the right to review alternative methods and compare with other commonly used approaches, including those discussed in the USDCM. 6.2.6.3 Certificate of Occupancy Upon completion of the permanent water quality control measure, the applicant will submit an As -Built Drawing, certified by a Colorado licensed Professional Engineer, of the permanent water quality control measure and associated drainage features. An As -Built Drawing Checklist, can be found in Appendix D. Upon receiving the As -Built drawing, Public Works will schedule an inspection of the permanent water quality control measure and associated drainage features to visually confirm site conditions with the submitted drawing. If the inspector has no concerns, the Certificate of Occupancy (CO) may be obtained. If not, the CO will be withheld until all concerns are addressed. For redevelopment sites or sites in violation, an 'MS4 hold' will be placed on the parcel, under which no permits will be issued until MS4 requirements are met. 6.2.6.4 Release from Grading Permit A site reaches final stabilization when all construction, paving, and landscaping is complete, and has reached at least 70 percent permanent vegetative cover. Upon achieving final stabilization of the site and release of the CDPS Construction Stormwater Permit, a final inspection will be conducted to verify final site conditions with the previously submitted Site Plans and As -Built Drawing. When confirmation is obtained, the site can be released from the Grading Permit. If the inspector observes conditions other than in the approved documents, additional actions and/or submittals may be required. Grading Permits may be subject to a permit renewal fee. 6.2.6.5 Long -Term Inspections of Permanent Water Quality Control Measures Permanent water quality control measures and associated drainage features shall be routinely maintained to function properly. Long-term operation and maintenance of the permanent water quality control measure will be verified by an annual inspection or at a rate determined by Public Works staff, not to exceed five years. If the volume capacity of the permanent water quality control measure cannot be visually verified, such as with a concrete trickle channel or other structural marker, Public Works may require a survey to be completed by a Professional Land Surveyor. Confirmation of the volume capacity will be confirmed in a report stamped by a Colorado licensed Professional Engineer. The survey and report may be required every five years. Upon change in ownership, the new landowner will be responsible for the proper operation and maintenance of the control measure. O&M Plans may be updated at any time by contacting the Public Works Department. 6.2.6.6 Post -Construction Enforcement When a violation is determined by an inspection, the owner will be notified either informally or formally based on the severity of the violation. Informal notification may be verbally communicated, or a written notice will be sent, usually by email. If corrective actions are made within a reasonable amount of time, no further action is required. If corrective actions are not made within an agreed -upon schedule, a WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 89 formal NOV w II be issued by certified mail. Additionally, an NOV may be issued if violations are severe or occur reputedly at the site. If corrective actions are not made within the specified amount of time, then an 'MS4 hold' will be placed on the parcel. Additionally, a hearing may be scheduled with the BOCC. If an illicit discharge has occurred or will likely occur, the Department of Public Works may take immediate action in cleaning up or preventing the contaminant from discharging into the MS4. Specific details concerning enforcement can be found in the Weld County Code. 6.2.7 MS4 Requirements for As -Built Drawing Checklist The purpose o' this checklist, provided in Appendix D, is to assist the applicant in submitting the required As -BL ilt Drawing for site drainage (ponds, swales, inlets, outlet structures, spillways, etc.) implemented wv.thin the MS4 area. As-Builts are typically a red -lined copy of the original plans, clearly depicting all cr anges made in the field. Elevations shown in the plans shall be verified through survey. Materials, dimensions, pond capacity and other aspects of the design shall be verified by the engineer. Additional she fts may be added to the As -Built Drawings if there is not enough room on the original plan. 6.3 REVEGETATION Guidelines fcr-evegetation in Weld County are provided in the Weed Management section of the Weld County Publiz 'Works website. For more information regarding revegetation, refer to the Revegetation chapter of the USDCM, Volume 2, and the Temporary and Permanent Seeding Fact Sheet (EC -2) of the USDCM, Volurr e 3. 6.3.1 Site Preparation An initial evaluation of site conditions is necessary for successful revegetation. Site preparation activities should include. at a minimum: • Initial hydrologic evaluation • Initial geed evaluation and control • Topsoi preservation (including existing wetland soil) • Soil testing • Soil arrendment • Seed b ?.d preparation • Tree protection A list of noxiou; weeds is provided in Chapter 15, Article I of the Weld County Code. In the case that noxious weeds exist onsite, the appropriate steps need to be taken before, during, and after work is completed to control their spread. Soil amendmerts may be needed to improve the existing soil conditions prior to revegetating the site. Recommendato-is for soil amendments are provided in the Revegetation chapter of the USDCM, Volume 2 and i iclude, but are not limited to, fertilizers, compost, peat, humates, sulfur, gypsum, lime, wood chips, an i soil micro-organisms. For disturbance of soils within the Weld County right-of-way, soils should be tested to determine requirements for fertilizing and conditioning. Based upon the test results, hydraulic growth medium (HGM) may be -Squired. Contact Public Works for fertilizer and HGM requirements. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE I 90 6.3.2 Seeding and Planting In addition to the site preparation guidelines outlined in the Revegetation chapter of the USDCM, Volume 2, seed mixtures should be coated with Mycorrhiza at the rate of 2 pounds per acre at the time of seeding. The Weed Management page of the Weld County Public Works website provides recommended seed mixes for use within Weld County. The design engineer is encouraged to work with Weld County Public Works in selecting a suitable seed mix. The two applicable seeding styles in Weld County are drill seeding and broadcast seeding. Drill seeding involves placing the seed in a firm seed bed just under the surface, which provides the best seed -to -soil contact and yields higher success rates. Typical application for this method uses 11 pounds to 14 pounds of pure live seed (pls) per acre. Broadcast seeding involves placing the seed directly to the surface of the soil, and typically uses 20 pounds to 24 pounds pls per acre. Ideal seeding dates are from April 1, or spring thaw, to June 15 and from September 15 until consistent ground freeze for non -irrigated areas. Winter and early spring seeding should not be conducted if the soil is frozen, snow covered, or wet (muddy). Hydro -seeding will be approved by Weld County only on a case -by -case basis. In order for a project to come to completion, it will be required that the project site achieve 70% plant density during full growing season. 6.3.3 Mulching Mulching is the practice of applying a protective layer of material onto the soil surface of plantings or a seeded area. Mulching may be achieved through straw or rolled erosion control product (RECP) installations. If mulching with straw, the straw must be certified weed -free. Mulching will not be conducted in wetland areas. Hydromulch will be approved on y on a case -by -case basis. 6.3.4 Maintenance A maintenance and management plan should be established for each project to ensure successful revegetation post -construction. Recommended maintenance activities include, but are not limited to: • Weed control and long-term management • Reseeding bare areas where grasses did not establish • Repairing erosion control fabrics, if applicable • Stabilizing eroded areas, particularly following large storm events • Installing protection from animal damage • Temporary or permanent irrigation, as needed • Removing debris • Installing and/or repairing temporary fencing to control foot traffic, particularly in heavily used park areas Wetland areas usually require specific post -construction monitoring as part of the Clean Water Act Section 404 permitting process. These requirements should be coordinated with Weld County Public Works. Refer to the Revegetation chapter of the USDCM, Volume 2 for more information. The property owner/developer is fully responsible for site maintenance and revegetation. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A U t. I 91 6.3.5 Erosion Protection Design Criteria Protecting major drainage channels from erosion is critical for maintaining channel stability. Channels need to be designed so that they remain stable until they are fully constructed or vegetated. It may be necessary to install riprap, straw bales, erosion control logs, or erosion control blankets in the channels to ensure that tiey remain stable. The BMPs outlined in the USDCM, Volume 3, shall be used to ensure stability. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 192 CHAPTER 7 FEMA FLOODPLAIN REQUIREMENTS All development, as defined by FEMA, shall comply with all floodplain regulations and codes, including the need to submit a CLOMR and a LOMR to FEMA for review and acceptance if applicable. For more information regarding floodplain regulations, refer to Chapter 23, Article XI, of the Weld County Code; the 2022 Colorado Water Conservation Board (CWCB) Rules and Regulations for Regulatory Floodplains in Colorado; and Title 44 Code of Federal Regulations (CFR) 59, 60, and 65 of FEMA's regulations. Floodplain-related work will be reviewed by the Weld County Department of Planning Services and a permit will be issued for all compliant submittals. For more information regarding floodplain modeling and mapping requirements refer to FEMA's Guidance for FEMA's Risk Mapping, Assessment and Planning. 74 BACKGROUND INFORMATION Weld County is a participant in FEMA's National Flood Insurance Program (NFIP), therefore, Weld County is responsible for ensuring that floodplain regulations, per FEMA, the state of Colorado, and Weld County are administered. Failure to administer the floodplain regulations can result in the suspension of Weld County from the NFIP. Suspension from the NFIP results in the inability of Weld County residents to obtain flood insurance and the suspension of disaster assistance funding from FEMA in the event of a natural disaster. 7.2 FLOODPLAIN MANAGEMENT OBLIGATIONS Weld County has several cases that govern many of the requirements set forth in this WCECC: • The boundaries of the floodplain should be accurately determined and based on a reasonable standard. Mallett v. Mamarooneck, 125 N.E. 2d 875 (N.Y. 1955). • Adoption of a floodplain regulation to regulate flood -prone areas is a valid exercise of police power and is not a taking as long as the regulation does not go beyond protection of the public's health, safety, morals, and welfare. Hermanson v. Board of County Commissioners of Fremont, 595 P.2d 694 (Colo. App. 1979). • The adoption by a municipality of floodplain ordinances to regulate flood -prone areas is a valid exercise of police power and is not a taking. Morrison v. City of Aurora, 745 P.2d 1042 (Colo. App. 1987). 7.3 FEMA FLOODPLAINS There are several hundred square miles of FEMA mapped floodplains in Weld County. Refer to the Flood Insurance Rate Maps (FIRMs) that are published by FEMA to determine if a proposed project is located within a mapped floodplain. The floodplain maps can be obtained from the FEMA Flood Map Service Center and the floodplain boundaries are depicted on the Property Portal Map maintained by Weld County. The Weld County Department of Planning Services should be contacted to determine if there have been any LOMRs or other changes to the floodplain boundaries that affect the project area. 7.3.1 Floodplain Requirements All development, as defined by FEMA, requires a Floodplain Permit (FP) or Floodplain Development Permit (FHDP) from Weld County. The applications can be found on Weld County's Planning and Zoning WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGL I 93 website. Contact the Weld County Department of Planning Services to determine which application is required. The Designer should also be aware that a CLOMR and a LOMR are required if there is an increase great?r than 0.00 feet or a decrease greater than 0.3 feet in regulatory floodways. A CLOMR and a LOMR aie also required if there is an increase or a decrease greater than 0.3 feet in the WSEL in regulatory floc dplains. Sections 4.7 arid 5.7 of this WCECC discuss the criteria for constructing hydraulic structures within an open channel. All design engineering of the hydraulic structures must follow accepted FEMA methodology. Construction of hydraulic structures within FEMA floodplains must not increase the WSEL for Zone A or Zone AE. Per FEMA regulations, a Floodplain Development Permit (FHDP) shall be required for the constrL ction of channels and other major drainage system components within the floodplain. It may be necessary to submit a CLOMR and a LOMR to FEMA as part of the development process. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA 194 CHAP TER 8 TRAFFIC CRITERIA This Chapter discusses the requirements for developing and submitting Traffic Impact Studies, traffic control devices, access to county roads, access design, auxiliary lane requirements, access construction within County right-of-way, and tracking control standards. 8.1 TRAFFIC IMPACT STUDIES A Traffic Impact Study (TIS) is required to analyze the effects of a proposed development or other land use action on the transportation system to determine if adequate public facilities exist to serve the proposed development, and to clearly identify any improvements required to mitigate the impacts on the transportation system. When a plan for development or redevelopment is submitted, the applicant is responsible for assessing the traffic impacts of the additional traffic to the surrounding transportation system under existing (current), short-range and long-range horizons. If a project is adjacent to a road that is under the jurisdiction of another entity (CDOT, City, Town, or adjacent County), the applicant is responsible for contacting that entity to determine the traffic analysis and access approvals that may be required. Any proposed access to a State Highway will require a CDOT Access Permit and direct coordination with CDOT. 8.1.1 Traffic Impact Study Area Traffic impacts shall be analyzed within the traffic impact area. The determination of a traffic impact area is done on a case -by -case basis; however, at a minimum the limits of the study should include: 1. Internal roads. 2. Adjacent roads. 3. Access locations and/or new intersections. 4. Off -site roads to the nearest paved County collector or arterial road or state highway. 5. Off -site roads where traffic from the proposed development or land use action will account for at least 20 percent of the average daily traffic upon build -out. 6. Off -site intersections where traffic from the proposed development or land use action: a. Contributes a 10 -percent impact of the peak hour traffic on any approach leg of an intersection where the intersection is operating at a level of service (LOS) C or better upon build -out. b. Contributes a 5 -percent impact of the peak hour traffic on any approach leg of an intersection where the intersection is operating at a LOS D or worse upon build -out. c. Impacts a specific turning movement that currently does not have an auxiliary turn lane by at least 50 percent of the peak hour volume warrant for an auxiliary turn lane. 8.1.2 Preliminary Traffic Impact Analysis A preliminary traffic impact analysis (traffic narrative) shall be submitted with every project application for the application to be considered complete. The intent of the analysis is to determine the project's cumulative development impacts, appropriate project mitigation and improvements necessary to offset a specific project's impacts. This analysis shall include the following information: WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 95 1. Descri ce how many roundtrips/day are expected for each vehicle type: Passenger Cars/Pickups, Tande -r Trucks, Semi-Truck/Trailer/RV (Roundtrip = One trip in and One trip out of a site). 2. Descrbe the expected travel routes or haul routes for site traffic. 3. Descrbe the travel distribution along the routes (e.g. 50 percent of traffic will come from the north, 20 percent from the south, 30 percent from the east, etc.). 4. Descri De the time of day that you expect the highest traffic volumes. Public Works will review the narrative and advise the applicant if more information or an engineered traffic impact !tudy is required. 8.1.3 Traffic Impact Study Requirements A full TIS is required for any proposed development or land use zoned Commercial or Industrial, any residential subdivision greater than nine (9) lots, or when determined necessary by the Engineer. The TIS should addres! impacts to on -site and off -site roadways and highways within the County and shall be prepared, stanned, and signed by a Professional Engineer licensed in the state of Colorado. The TIS shall include, at a minimum, the following information: 1. Describe the traffic impact area, including at a minimum those elements described in the traffic impact study area section of this document. 2. A location map showing the development site, the boundaries of the traffic impact area, and all roads, intersections, bridges, or other roadway structures in the traffic impact area. 3. Define the following study horizons for the Full Traffic Impact Study: the existing (current), short- -ange, and long-range horizons. a. Existing Horizon: The intent is to establish a baseline traffic condition. b. Short -Range Horizon: The intent is to evaluate the immediate impacts of the project on the transportation system. The short-range horizon year is defined as the point of full buildout of the proposed development or land use action. If the project is proposed to occur over multiple phases, the impacts shall be analyzed at the point of full buildout of each phase. In no case shall the short-range horizon exceed five (5) years. c. Long -Range Horizon: The intent is to evaluate the impacts of the fully developed project in the context of regional transportation planning efforts. The long-range impacts are analyzed as of the end of the current Regional Transportation Plan 20 -year planning horizon. 4. Identifw :he existing, approved, and proposed land uses within the traffic impact area. 5. Descrik e existing traffic conditions within the traffic impact area, including average daily traffic volumes for roadways and impacted intersections and a.m. and p.m. peak hour levels of service for intersections. a. Existing daily traffic data must be obtained from the Department of Public Works. If the data are not available for the area in question or data is outdated (older than 24 months for daily counts or 12 months for intersection counts), then the designer may obtain new traffic data. Daily traffic counts must be collected over a 72 -hour period starting on a Tuesday and ending on a Thursday of a normal week, excluding any holidays or events that may skew results. Daily traffic counts must have been collected within the past 24 months. Intersection turning movement counts must be collected for at least two hours each of the morning and evening peak hours of a typical weekday (Tuesday, WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE I 96 Wednesday, or Thursday) and must have been collected within the past 12 months. Existing daily roadway and intersection peak hour traffic counts must be included for the study area. Any traffic counts collected for the study should be included in Appendix I 6. For short-range traffic projections, provide references, calculations, and data sources for all trip generation estimates. The trip generation results shall be shown in a table with the following information: a. Land Use b. Unit of Measurement (for example, per dwelling unit, per 1,000 sq. ft., etc.) c. Total number of units d. Trip generation rates per unit for average daily traffic and peak hour volumes e. Total number of trips generated for average caily traffic and a.m. and p.m. peak hours 7. Short-range and long-range traffic projections must also include forecasts for the growth in background traffic. 8. Provide trip distribution estimates for the roads and intersections in the traffic impact area based on the following: Tables in the report need to show the trip generation rates used, based on the most recent version of the Institute of Transportation Engineer's Trip Generation Manual. If no Trip Generation Manual information is available, the site -specific number of trips can be calculated based on the number of employee trips for each shift time, number of deliveries, additional trips entering/exiting, and other applicable trips that may enter and exit the site throughout a typical day. a. Vehicle Types The number or percentage of anticipated trucks should be included in the trip generation. In the analysis, a Passenger Car Equivalent (PCE) should be used to account for slower -moving trucks in the traffic stream. The procedures for converting trucks to PCEs can be found in the latest edition of TRB's Highway Capacity Manual or in the CDOT State Highway Access Code. If a haul route is associated with the development, the route should be called out in the report. b. Trip Distribution The directional analysis for the site -generated traffic should be presented clearly. If internal trip reductions or pass -by trips are used in the calculations, they must be clearly documented. c. Total Proposed Volumes The total proposed trips and corresponding turning movement counts should be clearly shown for both the short-range horizon (project opening year) and for the long-range horizon (20 -year planning horizon). WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PA u L 197 9. Presert the volumes for short-range and long-range traffic including the projected traffic for the proposed development or land use action for the a.m. and p.m. peak hour and average daily condit ons. These volumes must include turning movements at intersections as well as volumes for roEds in the traffic impact area. 10 Analyz= the adequacy of the transportation system to handle the projected traffic for short- range .nd long-range planning years. Key elements in this analysis should include: a. Generalized daily traffic volume level of service for roadways and intersection levels of service for a.m. and p.m. peak hours, based on the following guidance: The LOS must be analyzed at each intersection within the study area. For unsignalized intersections, the worst -movement approach must be reported. The County has established LOS C as the minimum acceptable threshold at both signalized and unsignalized intersections. If LOS C cannot be achieved in the existing, opening year, or iorizon year analysis, mitigation should be recommended and documented. The existing peak hour LOS and delay calculations should be based on the procedures outlined in the latest edition of the TRB's Highway Capacity Manual. Typically, the weekday morning and evening peak hour will be used for analysis, but if the site's peak hours are anticipated at other times of day, the proposed peak hours of aralysis should be approved by the County. The following traffic analysis scenarios must be included: • Existing (Current) Year, without project • Short -Range Analysis, Project Opening Year with Project Traffic • Long -Range Analysis (20 -year planning horizon) without Project (Background Traffic) • Long -Range Analysis (20 -year planning horizon) with Project If the project is proposed to open in phases, the analysis of multiple opening year scenarios may be required. An additional Background Traffic Project Opening Year scenario may be required if background traffic volumes are anticipated to be significantly higher than under Existing Year conditions. Each analysis scenario should be presented clearly, with graphics showing the proposed access locations, assumptions used for trip distribution, trip assignment, intersection turning movements, daily traffic volumes, and LOS. Any existing or background intersection or roadway operational and geometric deficiencies in the study area should be clearly noted. b. The appropriateness of access locations and if necessary, a traffic signal warrant analysis. Requirements for access spacing are included in Section 8.5. All existing and proposed 'itersections within the study area should be assessed to determine if spacing criteria are met. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA 198 If an intersection within the study area may be signalized, a traffic signal warrant analysis should be performed based on the warrant criteria in the latest edition of the MUTCD. Both the opening year and horizon year conditions should be evaluated to determine if the intersection may meet warrants. c. The need for auxiliary lanes (turn lanes, deceleration, and acceleration lanes), including explanations of how acceleration/deceleration lengths, storage lengths, and taper lengths were determined. Requirements for auxiliary lanes are included in Section 8.7 and are based on the CDOT State Highway Access Code Rural Highway (Category R -B) classification requirements. If the roadway has characteristics differing from a Rural Highway, the designer should refer to the Access Code to utilize a more appropriate classification to calculate auxiliary lane needs. All intersections and site access points within the study area should be evaluated to determine if auxiliary lane warrants are met. If auxiliary lanes are in place, the study should determine if the storage length, taper length, and deceleration/acceleration lane distances meet minimum requirements with the added site traffic. d. Sight Distance All site accesses should be evaluated to ensure sight distance minimum requirements are met based on the requirements in Section 8.6. If applicable, the study should evaluate if changes to passing zones are recommended in the vicinity of the site due to the proposed development. e. Crash History A crash history and safety analysis may be required if the site is proposed to access a location where the County has identified a safety concern. Consultants may need to purchase third -party software, such as DiExSys, to analyze the safety performance functions of a location based on existing and proposed new traffic. If a location is found to perform at a level of service of safety greater than 3, then improvements must be determined to reduce the level of service of safety. Weld County will accept locations that have a level of service of safety of 1, 2, or 3. f. Sites Accessing Gravel Roads If the site is proposed to access gravel roads, an assessment should be performed to determine if development of the site requires consideration of paving the road. See Section 8.9 for Tracking Control requirements. g. Parking Needs For non-residential development, ensure that the site has adequate on -site or on -street parking available. h. Safe Routes to School and/or School Bus Stops WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 99 For residential development, identify existing or proposed school bus stops within the study area, existing and proposed sidewalks, and note any deficiencies and proposed improvements. Access to Public Transit If there is public transit within the study limits, identify accessibility to public transit and safe pedestrian/bicycle access to the nearest transit stop within half a mile of the project site. j. Haul Route If applicable, the site's proposed haul route should be identified. Any deficiencies along the haul route (such as pavement, bridge deficiencies, etc.) must be called out along the haul route, even if it is outside of the project study area. k. Provide a summary of conclusions and recommendations from the full Traffic Impact Study, including at least the following items: I. A summary listing of traffic impacts from the proposed development on existing and proposed roads and intersections within the traffic impact area. m. A summary listing of the improvements needed to assure adequate service and safety levels on the roadway system affected by the proposed development, identify and describe each proposed improvement, how and when it will be funded, and expected completion dates. i. The TIS should clearly state recommended improvements to the site accesses, intersections, and roadway system for the short-range and long-range years. Include any auxiliary lane recommendations, modifications to existing storage bay lengths, intersections recommended to be signalized, proposed turning restrictions at intersections or access points, modifications to roadway surface, or improvements required along the roadway. ii. An updated LOS analysis should be performed where mitigation is recommended to ensure that acceptable operations can be achieved for both short-range and long-range conditions. iii. Identify and describe each proposed improvement, how and when it will be funded, and expected completion dates. T. Any reasonable additional information deemed necessary for review—spec.al considerations. Public rA/orks will review the TIS and advise the applicant if more information is needed or provide -technical comments on the submittal. 8.1.4 Traffic Impact Study Checklist A stand-alone c hecklist will be provided to developers along with the Pre -Submittal Requirements packet found it Appendix I of this document. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA P AG ' 100 8.1.5 Updating Existing Traffic Impact Studies The following scenarios will require the preparation of an update (or amendment) to a previous study, or the preparation of an entirely new study. 1. When the time or circumstances of the original study fall within the parameters presented in Table 8-1, the applicant shall prepare the appropriate documentation identified in Table 8-1. 2. When the original study was prepared for a large, complex, or phased project and was designed, organized, and written to function as a "base" or master plan document for future development applications, it must include updates to the County comprehensive plan. (These types of studies require scoping consultation with the County prior to their preparation.) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 101 Table 8-1 Updating an Existing TIS Changes to the Original Development Original Report is: Access changed, increased by 15% or or trip more generation Access not did increase not change, by and 15% or more trip generation did < 2 years old Amendment discuss only letter: items that identify changed and (No Letter service other documenting traffic requirements) change; include level of > 2 years old New study Amendment • • • • Updated taken Revised Revised Meet letter, over all traffic trip LOS current including: 72 g analysis counts hours) eneration TIS requirements (daily counts 8.2 CHAD GE IN ACCESS USE If the use of ar existing access to County right-of-way changes or there is a change in the use of the property, a newv Access Permit will be required, in accordance with Chapter 8, Article 14 of the Weld County Code. Change in access or property use may include, but is not limited to, change in the amount or type of traffic, structural modification, remodeling, change in use or type of business, expansion of existing business, change in zoning, change in property division, and creation of new parcels. 8.3 TEMF ORARY ACCESS Any road access that will be closed after being used for a limited time may be considered a temporary road access, or a road that will be temporarily used for a different purpose may be considered a temporary upgrade in use. The time in use of temporary accesses will not exceed 18 months. A Temporary Access Permit may be granted only if the temporary access meets minimum County traffic safety and ope-ational requirements (Weld County Code Sec. 8- 14-10, et seq;, including sight distance and tracking cc ntrol that is discussed in further detail in Section 8.6 For a Temporary Upgrade in Use Access Permit, the access must meet prior use standards and regulations including use, width, ana turning radii after the permit expires. 8.4 TRAFFIC CONTROL DEVICES AND PLANS All road signs, f t-iping, delineators, barricades, signals, and other traffic control devices will conform to the most curre it edition of MUTCD and any applicable Colorado supplement, as amended. The applicant will be required to install all necessary signage and will bear all expenses for the fabrication and installatior of road name signs, permanent barricades, and signs for implementing the approved project desig-i e.g., one way, no parking, no outlet, stop sign, speed limit). Necessary signage will include signs rE quired on County roads as a consequence of the applicant's project, such as regulatory, guide, or warning signs. Signs and barricades will be in place prior to road acceptance. 8.4.1 Signa{ a and Striping Plans All road impro‘.ement and/or land development projects must incorporate a separate signage and striping plan in a:cordance with the criteria of this section. Striping plans may not be required for local subdivision roads. However, sign plans are still required for all subdivisions. All signing and striping plans WELD COUNT/ ENGINEERING & CONSTRUCTION CRITERIA P A G '- 1102 will conform to the most current edition of the MUTCD. All traffic control devices will be fabricated and installed in accordance with the MUTCD. Permanent signage and striping will be complete and in place before any new roadway is opened to the public for use. 8.4.1.1 Signage Plan Elements 1. Show the general longitudinal location of each sign (horizontal offset and station). 2. Specify the sign legend and sign type. 3. Specify the sign size. 8.4.1.2 Striping Plan Elements 1. Include stripe color and type. 2. Include lane width, taper lengths, storage lengths, etc. 3. Include striping/skip interval. 4. All permanent pavement marking materials, except point location markings, must meet current CDOT specifications for thermoplastic traffic marking paint unless another material is specified by the engineer and approved by the County. 5. All point location markings (stop bars, turn arrows, words, symbols, etc.) must meet specifications. 6. Include station and offset or dimensions for all angle points, symbol locations, and line terminations. 7. Include stripe dimensions. 8. Delineate raised median islands. 8.4.2 Striping guidance A stop line (stop bar) should be placed a minimum of 4 feet in advance of the nearest crosswalk line at controlled intersections. In the absence of a marked crosswalk, the stop line should be placed at the desired stopping point but should not be placed more than 30 feet or less than 4 feet from the nearest edge of the intersecting traveled way. Preferred distance is 10-12 feet from edge of traveled way. 8.4.3 Type and Location of Signs The Department of Public Works will make the final determination regarding the type and location of traffic control devices within the right-of-way or access easement. These controls will include traffic control signs, road name signs, delineators, and permanent barricades. 8.4.4 New Roadway Signage Permanent signage, unless otherwise approved by the Department of Public Works, will be installed before any new road or access easement is opened for use. 8.4.5 Memorial Sign Applications A memorial sign must be requested by the victim's family or another sponsor with the consent of the victim's family, in accordance with Weld County Code, Chaptef 8, Article VI, Sec. 8-6-180. Upon submittal of a Roadside Memorial Sign Application with fee to the Weld County Public Works Department, Public Works will review the application for acceptance. See also Appendix 8-L and 8-M of the Weld County Code. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A G F: 1103 8.4.6 Construction Criteria Refer to Section 10.9.1 and Section 10.9.2 for more -detailed information on construction criteria of pavement marking and traffic control devices. 8.5 ACCE3S S POINTS The Weld County Code defines an access as the place, means. or way vehicles or pedestrians shall have safe, adequate, and legal ingress and egress to a lot, trail, open space, off-street parking space or use. Weld County recognizes that property owners have a right of reasonable access to the County road system. Howe\ er, within an environment where population growth will increase traffic volumes and operational pressure on the general transportation system, be it rural or urban, access cortrol is crucial to protect the ).ablic health, safety, and welfare. Access control is used to maintain smooth traffic flow, to provide road right-of-way drainage, and to protect the functional level of the County roads while meeting state, regional, local, and private transportation needs and interests. Weld County Code Sec. 8- 14-10, et seq., :ontains the County's Road Access Policy. Also refer to the Weld County Functional Classificatior Map and Transportation Plan, available on the County's Transportation Planning webpage. An access permit application must be submitted for any new proposed access to a County -maintained road. If a property is proposed to directly access a State Highway, access must be approved and obtained by CLOT as described in Section 8.3.1.1.a. If a property is proposed to directly access a road under the juris fiction of a local municipality, access must be approved and obtained by the local municipality. If a property hE s frontage on two roads, it is recommended access should be obtained from the lower volume road wren possible. Intersection an access spacing criteria (as measured from centerline to centerline) for local roads, collector roads and arterial roads are shown in Table 8-2. Table 8-2 Minimum Intersection and Access Spacing Criteria (feet) Access Element Arterial Collector Local Distance Signalized Unsignalized between intersections 2,640 1,320 1,32O N/A N/A 330 Distance between access points and intersections 660 660 330 Distance between access points 660 330 150 Distance between access points in Subdivisions N/A N/A 75 If design criteria :annot be met for auxiliary lane requirements or if an operational thresho d of LOS C cannot be maintained, the proposed access may be approved as restricted movement, as described in Section 8.5.6. 8.5.1 Local Roadways Access standarcs to local roadways will be governed by Weld County recognizing that property owners have a right of reasonable access to the County road system. However, within an environment where WELD COUNT\ ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 104 population growth will increase traffic volumes and operational pressure on the general transportation system, be it rural or urban, access control is crucial to protect the public health, safety, and welfare. Access control is used to maintain smooth traffic flow, to provide road right-of-way drainage, and to protect the functional level of the County roads while meeting state, regional, local, and private transportation needs and interests. Weld County Code Sec. 8-14-10, et seq., contains the County's Road Access Policy. Also refer to the Weld County Functional Classification Map and Transportation Plan, available on the County's Transportation Planning webpage. Whenever possible, shared accesses will be given priority. 8.5.2 Collector Roadways Access standards to collectors are shown in Table 8-2. An access or new intersection onto a collector is not permitted unless it meets the spacing requirements in Table 8-2 and an alternative access or intersection to a lower classified road is not feasible. No more than one access will be allowed to an individual or to contiguous parcels under the same ownership unless it can be shown that the additional access would not be in conflict with local safety regulations; the additional access would not be detrimental to public health, safety, and welfare; and the additional access is necessary for the efficient use of the property. 8.5.3 Arterial Roadways Access standards onto arterial roadways are shown in Table 8-2. An access or new intersection onto an arterial is not permitted unless an access/intersection to a lower classified road is not feasible and the proposed access meets the spacing requirements in Table 8-2 and does not interfere with the location, planning, and operation of the general street system or access to nearby properties. Whenever possible, shared accesses will be given priority. No more than one access will be allowed to an individual or to contiguous parcels under the same ownership unless it can be shown that allowing only one access would be in conflict with local safety regulations; the additional access would not be detrimental to public health, safety, and welfare; and the additional access is necessary for the efficient use of the property. Intersections will be spaced no less than one -quarter mile apart on arterials, unless such spacing is impractical or impossible due to topographic or other physical limitations as determined by the Department of Public Works. The type of access full movement, three-quarter movement, or right- in/right-out movement —will be determined by the Department of Public Works. 8.5.4 State Highway and Interstate Systems CDOT and FHWA rules and regulations will apply to all highway and interstate accesses. Weld County takes no jurisdictional authority over access onto a highway or interstate. 8.5.5 Shared Accesses Whenever possible and feasible, shared access will be provided to serve two or more adjacent properties. A shared access is to be centered on the common property line. For shared accesses, the County strongly recommends the property owner establish a written access road maintenance agreement so future owners of the properties will be aware of their requirements for shared maintenance of the access road. Shared access and utility easements shall be a minimum of 30 feet wide and shall contain a minimum 20 -foot -wide, all-weather roadway. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1105 8.5.6 Restr .cted Movement Access If the minimun spacing criteria cannot be met, or if the minimum level of service threshold of LOS C cannot be ach e✓ed, the County may require that the movements at an access be restricted to ensure traffic safety. be following types of access are most common: 1. Full movement access. All potential movements for the access are allowed. 2. Three-quarter access. All movements are allowed except a left turn out of the access. 3. Righ;-ir- fright -out access. Only right turn in and right turn out movements are allowed. 8.5.7 Access Control Plans On corridors NAith an adopted Access Control Plan in effect, recommendations for each existing and future access I )cation and policies that guide future access management efforts will be enforced. 8.6 ACCE3S DESIGN Access points will be designed to provide safe movement for traffic entering and traveling on roadways within the Coin :y. Like intersections, access points are conflict locations. The basic design of access points include! adequate spacing, proper alignments, and clear sight distances. 8.6.1 Geometric Design Accesses shall Niter onto Weld County roads at an 80- to 100 -degree angle, for a minimum of one vehicle lengti. An access approach that is gated will be designed so that the longest vehicle (including trailers) using the access can completely clear the traveled way when the gate is closed. In no event will the distance from the gate to the edge of the traveled surface be less than 35 feet. Any overhead entry structures shal have at least a 14 -foot, 6 -inch clearance, measured from the access surface. When the access is intended for commercial or industrial use, the access radii shall accommodate the turning movements of a iticipated vehicle types. AutoTURN exhibits may be required by the County if there is a safety or operational concern. Table 8-3 shows the access width and access radii for properties based on land use. Table 8-3 Access Geometry Type of Land Use Maximum Access Width at ROW Access Radii Single-family re;idential 24 feet wide 25 feet minimum Commercial/Inc ustrial/Agricultural 40 feet wide 65 feet minimum Fill slopes and cut slopes will be constructed to match the slopes of the existing County road adjacent to the maximum E ccess width as identified at the ROW line. It is desirable that all side slopes be no steeper than 4:1 (H:V). Drainage culverts are required for new access points unless otherwise approved by the County. Minim am required size is a 15 -inch aluminized CMP or RCP. See Section 5.8.3 of this document for allowable culvert types. Minimum cover requirement will be 12 inches above the pipe crown to the bottom of asph-a t at the edge of pavement (for paved roads) and a minimum of 12 inches of cover above the pipe crown to the top of the finished grade (for gravel roads). All culverts should be sized to convey the floe" water based on the existing capacity of the ditch and meet the HW/D requirements specified in Cia pter 5 of this document. Figure 8-1 shows a typical access approach. Dimensions of radius and ac:ass width should be determined by Table 8-3, above. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGF 1106 Figure 8-1 Access Approach 15" MINIMUM DIA. CULVERT RADIUS ACCESS WIDTH GRAVEL OR PAVED SURFACE AS REQUIRED 41. FLARED END SECTIONS - I_ RIGHT OF WAY FLOW LINE WELD COUNTY ROAD SHOULDER ter EDGE•OF•TRAVEL-LANE 8.6.2 Access Sight Distance Accesses are stop controlled so the access sight distance discussed in this section is the distance required for vehicles to enter traffic and accelerate to the average running speed. There shall be an unobstructed sight distance along both approaches and both sides at an access (within the right-of-way) for distances sufficient to allow the operators of vehicles that are approaching simultaneously to see each other in time to prevent collisions at the access. All clear sight triangles must be within the public right-of-way or a sight distance easement. See also Figure 8-2. Distance a2 in Figure 8-2 is equal to distance a1 plus the width of the lane(s) departing from the intersection on the major road to the right. Distance a2 also should include the width of any median present on the major road. The appropriate measurement of distance al and distance a2 for departure sight triangles depends on the placement of any marked stop line that may be present and, thus, may vary with site -specific conditions. In Weld County, the typical distance behind the traveled way to the stop bar is 14 feet. b = 1.47Vmajort9 Eq. 8.6.1 b = Access Sight Distance (see Figure 8-2) V„,,„,„-= Design Speed of major road (MPH) tig= time gap needed for vehicle entering major road (sec) 4= 7.5 Car, 9.5 Single -Unit Truck, 11.5 Combo -Unit Truck Adjust tgfor crossing more than 2 lanes: +0.5/extra lane for cars +0.7/extra lane for trucks Also adjust tgfor starting grade of the vehicle if it exceeds 3% +0.2 sec/percent grade for cars and trucks (only for starting uphill) WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 0.07 The value calc _dated should be rounded up to the nearest 5 feet. Additional infc rrnation regarding sight distance for intersections and cases other than the stop control condition cal )e found in AASHTO's A Policy on Geometric Design of Highways and Streets. Figure 8-2 Departure Sight Triangles at Access (Stop Control) 4 b Weld Cot. my Rd Clear Sight Triangle Decision Point (.0 (0 CD a) 0 Q` fi Depar ure Sight Triangle for Viewing Traffic r4 _ b Weld County Rd )1 a2 } I Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic Approac ii -ig the Access/Driveway from the Left Approaching the Access/Driveway from the Right 8.6.3 Subdi vision Roads Sight Distance Roads should rot have visible impediments between 3 feet and 8 feet in height at subdivision intersections vs ithin a triangular area, as shown in Figure 8-3. Figure 8-3 Subdivision Road Sight Distance Triangle EDGE OF DRIVING SURFACE (FLOWLINE) 40' POINT OF / INTERSECTION PROHIBITED AREA 40' EDGE OF DRIVING SURFACE (FLOWLINE) WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 108 8.7 AUXILIARY TURN LANES Auxiliary lanes are useful in maintaining the safety, traffic flow, and operation of a roadway or access. When auxiliary lanes are required by the County or warranted by information obtained during the development review process, the applicant is responsible for design, installation, and any purchase of right-of-way to accommodate the required lane width. Auxiliary lanes are required when unique location factors (e.g., roadway speed and traffic density, access volume, the volume of commercial trucks, the influence of nearby accesses, existing auxiliary lanes close to the proposed access, nearby traffic control devices, available stopping sight distance, and other topographic or roadway design factors) exist that determine the need for auxiliary lanes. Auxiliary lanes are required to mitigate specifically identified and documented locations with safety and/or operational problems. These include: • Any access where high traffic volume or lack of gaps in traffic make an auxiliary lane necessary for vehicles to safely and efficiently enter/exit the roadway. • Any locations where conditions such as horizontal or vertical curves and sight obstructions exist that cannot be removed and may negatively affect public safety or traffic operations. Auxiliary lanes typically consist of one or more of the following: transition taper, acceleration or deceleration length, and storage length (see Figure 8-4). The use of these components varies based on speed limit, through street classification, and site -specific conditions (grades). Figure 8-4 Auxiliary Lanes Layout REDIRECT TAPERS REDIRECT TAPERS -‘ ACCELERATION LANE DECELERATION LANE DECELERATION LANE ACCELERATION LANE TRANSITION TAPERS TRANSITION TAPERS Auxiliary turn lanes shall be installed on local, collector, and arterial roadways according to the criteria in Table 8-4, which is consistent with the requirements for Rural Highways in the CDOT State Highway Access Code. Auxiliary lanes may be also required at the County's discretion if safety needs or unique location factors discussed above warrant the addition of an auxiliary lane. Auxiliary lane thresholds should incorporate a passenger car equivalent factor based on the existing and projected bus, truck, and combination volumes. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A h 1 109 Table 8-4 Auxiliary Lane Requirements Classifica-ions Auxiliary Lane Criteria to be Checked Left Minimum Deceleration for Turns Left- Ingress Required Turn Lane Right Minimum Deceleration for Turns Right Ingress Required -Turn Lane Require Acceleration Minimum Right Turns Right- Egress to Turn Lane Minimum Turns Acceleration Left to -Turn Egress Require Lane Left Arterial 10 vph 25 vph 50 vph May safety would of be the and required benefit roadway operation the if it Collect )r 10 vph 25 vph 50 vph safety May would of be the and required benefit roadway operation :he if it Local 10 vph 25 vph Generally applicable not Generally applicable not Geometric Camponents Deceleration + Storage Taper Length Length Length + Deceleration + Taper Storage Length Length Length Acceleration (Includes Taper) Length Acceleration (Includes Taper) Length g + 8 The geometric components of a deceleration lane are shown in Figure 8-5 and of an acceleration lane in Figure 8-6. Figure 8-5 Geometric Components of a Deceleration Lane Deceleration Length Taper Length 1 Storage Length Traffic Direction WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 110 Figure 8-6 Geometric Components of an Acceleration Lane 8.7.1 Auxiliary Lane Length To determine the required acceleration and deceleration lane and transition taper length, see the design criteria presented in Table 8-5 and Table 8-6. Table 8-5 is an excerpt taken from Table 4-5 of the State Highway Access Code, August 31, 1998, for a Category R -B —Rural Highway. A rural highway is described as, "highways that have the capacity for moderate to high travel speeds and low traffic volumes providing for local rural needs. This category may be assigned to low volume minor arterials, secondary collectors and local highway sections that do not normally provide for significant regional, state or interstate travel demands. "The Category R -B meets the needs for most Weld County maintained roadways. The designer should refer to the State Highway Access Code for roadways with characteristics differing from the R -B description above. The length of the required transition taper is determined by multiplying the distance offset (lateral shift) by the transition taper ratio value associated with the posted speed in Table 8-6. The beginning and ending point of all tapers shall be rounded. • Acceleration Transition tapers: The purpose of an acceleration lane and transition taper is to provide sufficient length for a vehicle to accelerate to the appropriate speed and merge into the through traffic lanes without disrupting traffic flow. Table 8-6 provides the required acceleration lane and transition taper lengths by design speed. Acceleration lane lengths in Table 8-6 will be adjusted for a grade of 3 percent or more by the factors shown in Table 8-7. The total length of the acceleration lane includes the values of both the lane and transition taper. The length of a transition taper is calculated by multiplying the width of the lane by a standard ratio shown in Table 8-6. The beginning and ending point of all tapers will be rounded. • Deceleration Lane lengths: Deceleration lengths shown in Table 8-6 represent the estimated distance to maneuver from the lane into an auxiliary lane and brake to stop. The transition taper is calculated based on design speed and deceleration lane lengths in Table 8-6 will be adjusted for a grade of 3 percent or more by the factors shown in Table 8-7. The storage lane lengths will be included in the calculation, which are shown in Table 8-8 or based on the results of a Traffic Study • Redirect or straight tapers: Redirect tapers will be used where an exclusive turn lane, median, or other redirection of vehicles is necessary and where redirection of the flow of traffic is necessary to accommodate the exclusive turn lane or median. Redirect tapers required for redirecting through travel lanes will be installed in conformance with Table 8-6. If the redirect taper would WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 111 resu t n a horizontal curve design deficiency for the through movement, the horizontal curve will be corrected. Redirect tapers should be designed as straight tapers with the beginning and endi'i€ points rounded. • In cases where there is constrained right-of-way, restrictive topography, or limited distance betwe ?n intersections, a design waiver may be obtained to construct a shorter auxiliary lane. Table 8-5 Components of Speed Change Lane Lengths for Rural Highways (R -B) from State Highway Access Code Access Category Left -Turn Deceleration Lane Right -Turn Lane Deceleration Acceleration Lane R -E *decel. Length + storage *decel. Length *accel. length *Taper length is it ciuded within stated accel. Or decel. length Table 8-6 Acceleration/Deceleration Lane and Taper Design Criteria and Redirect Taper for Through Lanes Acceleration/Deceleration Lane Design Criteria Posted speed li -nit (MPH) 25 30 35 40 45 50 55 60 65 Deceleration le lath (ft) 180 250 310 370 435 500 600 700 800 Acceleration emgth (ft) N/A 190 270 380 550 760 960 1170 1380 Accel/Decel Tra- taper (ratio) 7.5:1 8:1 10:1 12:1 13.5:1 15:1 18.5:1 25:1 25:1 ;ition Redirect (ratio) (Stra ig-'it) taper for Through Lanes 15:1 15:1 20:1 30:1 45:1 50:1 55:1 60:1 65:1 Table 8-7 Grade Adjustment Factors for Acceleration Lanes Grac e Posted Speed Limit (mph) 25 to 45 50 55 60 65 3 to 4.9% Up trade 1.3 1.4 1.5 1.5 1.7 5 to 7% Up Grade 1.5 1.8 2.0 2.3 2.5 3 to 4.9% Down Grade 0.7 0.65 0.65 0.6 0.6 0.6 0.55 0.55 0.5 0.5 5 to 7% Dowr Grade 8.7.2 Storage Lengths The storage lergth for an auxiliary lane can be determined by the information summarized in Table 8-8. These lengths a re based on the average length of a passenger vehicle and the estimated turning vehicles per hour. Estirrzted lengths for buses, larger trucks, and recreational vehicles must be determined and submitted to if e County for review, or a "passenger car equivalent" (PCE) should be incorporated into the storage length calculation. Use a PCE of 3 for each bus and all trucks and combinations of 40 feet in length or longee Use a passenger car equivalent of 2 for each vehicle or combination at or over 20 feet in length but le than 40 feet. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 112 Table 8-8 Auxiliary Lane Storage Lengths Auxiliary Lane Storage Lengths Turning vehicles per hour < 30 30-59 60-100 100 200 300 Minimum required storage length (ft) 25 40 50 100 200 300 Truck traffic generators (ft) 100 100 200 200 200 300 The basis for designing the length of required storage is to provide sufficient length for vehicles to queue within the lane without affecting other movements. Table 8-8 provides the required storage lengths for stop -controlled intersections. Storage lengths for signal -controlled intersections may be determined from highway capacity nomographs in the Highway Capacity Manual or may be based on the recommendations of the submitted Traffic Impact Study for the development. If the Department of Public Works determines that meeting the required storage length is impractical or will result in an unsafe condition, the minimum storage length will be based on the mean arrival rate. 8.7.3 Auxiliary Lane Conflicts The following standards also apply for auxiliary lane design. 1. No driveway will be permitted within the transition area of any auxiliary lane. 2. In the event that a portion of an auxiliary lane extends across one or more adjacent properties, the County may require the applicant to obtain any necessary right-of-way. 3. In the event an auxiliary lane is constructed within 100 feet of an arterial -arterial intersection, the applicant is responsible for design, acquisition of required right-of-way, relocation of utilities, and construction of the lane to such intersection. 4. Where two intersections have exclusive turn lanes that overlap or the ending points of the exclusive turn lanes have less than 300 feet or one-half their length of separation (whichever is shorter), and a significant structure or topographical feature does not preclude widening, a continuous exclusive turn lane will be constructed between the intersections to improve roadway consistency and safety, and to maintain edge of pavement continuity. 5. If restrictive topography allows only one exclusive turn lane, normally a left -turn deceleration lane is given first priority. Where a left -turn lane is installed and the travel lanes must be redirected, an overlay of pavement is required. 8.8 ACCESS CONSTRUCTION All roadway access construction that affects existing structures within the County right-of-way such as pavement, curbs, gutters, sidewalks, drainage structures, ditches, and auxiliary lanes —is required to incorporate modifications to existing structures as part of the final access design. An Access Permit is required prior to any new access construction. The Access Permit allows construction of the access without the need for obtaining a separate Right -of -Way Use Permit unless the proposed access point is located within section line County Right -of -Way or if the access is to be paved with asphalt or concrete. 8.8.1 Gravel Requirements Gravel or recycled asphalt gravel base will be permitted for individual residential access or field access adjacent to County roads with gravel surfacing. The gravel surface will include a minimum of 6 inches of WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA FAGE I 113 compacted aggregate base course or equivalent material from the right-of-way line to the edge of the traveled roadvway. Specifications for this material can be found in Section 9.6.6. 8.8.2 Pavement Requirements Access pavemE rt thickness shall match roadway pavement thickness. If required by the weather, a delay of one season n placement of hot bituminous pavement may be allowed, provided adequate gravel surfacing is sJk stituted and maintained until asphalt placement. 8.8.3 Acces Drainage Accesses shall )e constructed in a manner that minimizes erosion and does not result in deposition of silt and debris Mn the County roadway or in roadside ditches. Accesses that slope down toward the public road wil be constructed to assure that water does not run onto or across the traveled public way. This may incluc e designing the crown, borrow ditches, pans, or other elements so that they direct water to the existing drainage facilities along the road. The owner of the property shall pay for materials and the cost of installation for new access culverts whenever the installation of a culvert is mace necessary by the creatior of a new access from private property to a County roadway. The applicant is responsible for any alterEti ns of the natural flow of water across private properties. 8.8.4 Structures For efficiency and to avoid maintenance or public safety concerns, the County reserves the right to maintain the fL II width of the road right-of-way without structures located thereon. Structures include, but are not lira ted to, fences, trash cans, gates, mailboxes, and irrigation structures regardless of whether they we physically located on the traveled portion or right-of-way will be removed from the right-of-way upon written request by the Department of Public Works. Mailboxes may be located in the public road rigf t -of -way only where they do not create a roadside hazard, obstruct or hinder vehicular or pedestrian t -affic, or interfere with road maintenance activities such as snowplowing and mowing. Mailboxes wi I )e located at least 8 feet away from the edge of the traveled way. Wear, damage, c r breakage to mailboxes, fencing, decorative items, signage, or any other appurtenances throughout the property roadside frontage due to thrown snow and inclusions from snow removal activities on a County -maintained road will not be the responsibility of the County. 8.9 AVERAGE DAILY TRAFFIC COUNT Volume counts are expressed as average daily traffic (ADT) counts or annual average daily traffic (AADT) counts. ADT is the unadjusted, average number of vehicles passing in both directions at a specified location of a ro 3dway. AADT is the term used to show the average traffic volume in both directions on a section of road. adjusted for seasonal variation. Traffic count information for pavement designs must be obtained from -he Weld County Public Works Department. If the count information is not available for the area neede J, then a traffic count must be completed by the designer and approved by Weld County. The count mLsl be a 72 -hour continuous count and completed on Tuesday, Wednesday, and Thursday of a normal weed: (no holidays or special events taking place). The traffic count cannot be a raw volume count; it must i iclude a Vehicle Classification. If known changes to the traffic volumes exist since the latest count, su:h as new development or changes to existing development that could modify the counts, then a new traffic count may be warranted. WELD COUNT`? ENGINEERING & CONSTRUCTION CRITERIA PAGE 1114 Table 8-9 Traffic Count Seasonal Adjustment Factors SEASONAL ADJUSTMENT FACTORS Timeframe Adjustment Factor Jan. 1 —Feb. 28/29 1.08 Mar. 1 —Apr. 4 1.00 Apr. 5 —May 16 0.98 May 17 —Jun. 20 0.96 Jun. 21 —Aug. 22 0.94 Aug. 23 —Sep. 26 0.94 Sep. 27 —Nov. 1 0.97 Nov. 2 —Nov. 29 1.04 Nov. 30 —Dec. 31 1.08 8.9.1 Vehicle Classification Vehicle classification categorizes vehicles into three types, as described below. • Lightweight vehicles: All motorcycles, cars, pickups, vans, and single/dual wheels o Class 1 through Class 3 • Single units: Buses and other units up to three axles o Class 4 through Class 7 • Combo units: Vehicles of four axles and more Class 8 through Class 13 Figure 8-7 shows the most common types of vehicles found on the nation's highways. Designers can use this information to determine which vehicle classification category should be used for the vehicles identified in the traffic count. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA N A C, E 1 115 Figure 8-7 FHWA Vehicle Classification (CDOT M -E Pavement Design Manual, Figure 3.6) Class Schema Description 1 4 _s a' n otr cyc s FtlL _• :AID wheel axles = M-- l) all cars plus "'"�+• [ •,t'T�jb 's oneileo axle trailer _.R _ J l• all pick ups and tars Ii slrgte clua1 wits ht pus 1—.11.4___rebtb-ii.) one:�a+o twee axle joiliz±3 i.�._!i"b.-.._, i trailers 410.- - - �' 4E;770 • buses sr1gfE+'dl:as ie►tlee'E 5 r.:%P` 4 [...__c 1-25 :NO axle '1 y ie unit Sng is' alai Knees 011) - - - - " �, O � r A E i ii_J IPS s 7 icizi stir::: iiiZ-. •.. II 8 1�� 1" , to Le car ess axles. _ singe trailers 9 five axles t•• f bing tralin 10 six or more axles. — slrg ie trailers gigi iii 11 ti,Fe.•• lees '-i,_c i iri i r'...q -V:: IE. 7: • • ..- rir ii OM 1 1 it 13 r sever L r more ax:es. _ !ass • rrnultl-tra ,e�ts . ,.. _ ..11. • . ----w-i% * An. ,' ir- iHr 14 1 '1nctas s if ate le i,erIc ittii ."' 15 43 t used WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1116 CHAPTER 9 SOIL INVESTIGATION AND PAVEMENT DESIGN 9.1 INTRODUCTION AND PURPOSE The design of a pavement structure involves the consideration of many factors and conditions the most important being traffic volumes, vehicle classifications, design materials, existing materials, local climate, and drainage conditions. The purpose of this chapter is to give general guidance and to supplement the existing design information contained within the latest editions of the 1993 AASHTO Guide for Design of Pavement Structures and the CDOT M -E Pavement Design Manual, as well as AASHTO or ASTM Material Manuals. AASHTO 1993 should be used only for onsite roadway pavement designs and M -E should be used for any offsite pavement designs maintained by Weld County. These criteria provide the basic design procedures and reporting guidelines for flexible and rigid pavements. The final design should be based on a thorough investigation of specific project conditions, projected traffic, life- cycle economics, and on the performance of comparable projects with similar structural sections under similar conditions. An adequate pavement design will reduce long-term maintenance costs and provide a long-lasting driving surface. 9.2 FIELD INVESTIGATION AND SOIL SAMPLES Designers should visit each site to gather information that may help determine the appropriate design. Whether this is a new design or rehabilitation of an existing pavement, information such as current distress, drainage conditions, roughness, traffic control options, and surrounding land usage should be collected and will be used later during the actual design. 9.2.1 Testing Frequency Soil samples within the project limits will be obtained for each soil type as defined in the Soil Survey of Weld County, Colorado (http://websoilsurvey.nres.usda.gov/app/) or at a spacing of not more than 500 linear feet. These boring locations will include, but not be limited to, travel lanes, shoulders, auxiliary lanes, and roadside ditches. 9.2.2 Sampling Procedures Borings can be performed by either an auger or core drill. The depth of each hole generally should be at least 5 feet to 10 feet, depending on the anticipated depths of cuts or fills of a new roadway. Borings for rehabilitation of existing surfaces generally can be on the lower side of the range unless major reconstructions are necessary at certain locations. All borings will be field logged and visually classified. 9.3 SUBGRADE TESTING 9.3.1 Classification Each boring location will be tested to determine liquid limit, plastic limit, plasticity index, and the percentage passing the U.S. Standard No. 200 sieve. Test results will be used to calculate the AASHTO Classification and Group Index using AASHTO M 145. These data will be determined using the following methods: • Liquid limit: AASHTO T 89 or ASTM D 4318 • Plastic limit: AASHTO T 90 or ASTM D 4318 • Percent passing No. 200 sieve: AASHTO T 11 or ASTM C 117 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE X117 • Graca-ion: AASHTO T 27 or ASTM D 422 9.3.2 Swell Test Swell potentia evaluation will be required when a soil is classified as an A-6 to A-7 type. • Swell ti st: AASHTO T 216 or ASTM D2435 9.3.3 pH anti Sulfate pH and Sulfate testing will be performed at each boring location. It is important not only to identify the presence of su fates but also the depth of occurrence. The designer or project manager should know what depths are crucial to the success of the design. • Sulfate ion content: CP-L2103 • pH of soils: AASHTO T 289 9.3.4 Moist Ire Density Standard tes: methods for moisture density are described in AASHTO T 99 and AASHTO T 180. 9.3.5 Hveen Stabilometer Representative samples will be tested to determine the subgrade support value using Hveem Stabilometer (k -value) testing. These values will be used in the design of the pavement section. R -value will be perforrr ed on each soil group (AASHTO classification) but will never be less than a minimum of two per soils re port. These tests will be conducted in accordance with the following procedures. We suggest perforir ing the hydrometer testing for all applicable soil of interest since the percent silt and clay content n soil are identified as important independent variables. • R -Value : CP (Colorado Procedure) 3101 (AASHTO T190 & ASTM D 2844-07) where the reference documents used to develop CP 3101 Table 9-1 Test Requirement and Frequency Tes- Testing Frequency Notes/Exception Liquid limit Each Boring Location Plastic limit Each Boring Location Gradation Each Boring Location AASHTO Classif cation Each Boring Location pH Each Boring Location Sulfate Each Boring Location Swell Each Clay Soil Type A-6 through A-7-6 soil types Moisture Dens ty Per Report Bulk sample of material governing pavement design CBR or R -value See Section 9.3.5 9.4 PAVEMENT DESIGN CRITERIA FOR ONSITE ROADWAYS Weld County's pavement design method for onsite roadways is based on the 1993 AASHTC Guide for Design of Pavement Structures equations and CDOT guidelines. This section provides the criteria used for the desigr cf these pavements. These criteria will ensure adequate strength and durability to carry WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 1118 the predicted traffic loads for the design life of each project. Alternative designs will be considered as advances are made in pavement design methods and paving materials. Any deviation from the criteria presented in this document must be technically justified and approved by the Public Works Department. Weld County does not allow the use of full -depth asphalt paving and does not accept maintenance of any full -depth paved roads. 9.4.1 Design Equivalent Single Axle Loads (ESAL) There are certain input requirements needed to obtain an 18,000 -pound (18 KIPS) Equivalent Single Axle Load calculation or design ESAL. • Annual average daily traffic count (see chapter 8) • Vehicle classification (see chapter 8) • Traffic equivalence load factors • Traffic growth rate • Design period • Lane factor 9.4.2 Traffic Equivalence Load Factors The equivalence load factor is a numerical factor that expresses the relationship between axle loads of the three types of vehicles. Table 9-2 presents equivalence loads factors from CDOT's M -E Pavement Design Manual. Table 9-2 Equivalence Load Factors (CDOT M -E Pavement Design Manual, Table H.2) 3 -Bin Vehicle Classification Flexible Pavement Rigid Pavement Lightweight vehicles 0.003 0.003 Single units 0.249 0.285 Combo units 1.087 1.692 9.4.3 Traffic Growth Rate The number of vehicles using a road tends to increase with time. Weld County uses a 20 -year growth rate to estimate the future traffic on roadways. The growth rate is applied to all of the vehicle classifications. A growth rate assumes that the AADT percent growth rate for any given year is applied to the volume during the preceding year. Contact the Public Works Department for assistance in determining an appropriate growth rate. 9.4.4 Lane Factor The number of vehicles or ADT on the roadway will be split according to the number of lanes in the proposed roadway. Table 9-3 lists the acceptable values. Table 9-3 Lane Factors (Modified from CDOT M -E Pavement Design Manual, Table 3.3) Lanes per Direction Design Lane Factor One lane 0.60 Two lanes 0.45 Three lanes 0.309 Four lanes 0.25 WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAur. 1119 9.5 FLEXIBLE PAVEMENT DESIGN 9.5.1 Servii:eability and Reliability The initial serviceability for asphalt at construction normally will fall in the range of 4.2 to 4.6 and generally will be assumed to be 4.5. The terminal serviceability is based on the current ADT. These factors can he found in Table 9-4. Table 9-4 Serviceability Sery ceability Loss ADT 2.0 >750 2.5 <750 The reliability -actor, shown in Table 9-5, is based on the functional classification of the roadway. Weld County's functc nal classification map can be found on the transportation planning section of the Public Works Department web page. Table 9-5 Reliability Factor Functional Classification Urban/Rural Arterial 90 Collector 85 Local 80 9.5.2 Stand ird Deviation Weld County uses an overall standard deviation of 0.44 for all pavement designs. 9.5.3 Drain age Factor The drainage factor shown in Table 9-6 may be incorporated into the pavement design to account for the drainage ckaracteristics of the site. Table 9-6 Drainage Factor Quality Drainage of Water Removed Within: Percent of Time Pavement Levels Structure Approaching is Exposed Saturation to Moisture Less than 1% 1% to 5% 5% to 25% >25% Excellent 2 hours 1.40-1.35 1.35-1.30 1.30-1.20 1.20 Good 1 day 1.35-1.25 1.25-1.15 1.15-1.00 1.00 Fair 1 week 1.25-1.15 1.15-1.05 1.00-0.80 0.80 Poor 1 month 1.15-1.05 1.00-0.80 0.80-0.60 0.60 Very poor Will not drain 1.05-0.95 0.95-0.75 0.75-0.40 0.40 9.5.4 Strength Coefficients The strength cc efficients are used in the structural number equation to determine the thic<ness of the various layers cf the pavement structure. Table 9-7 lists the strength coefficients for various potential components of tie pavement section. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 1120 Table 9-7 Strength Coefficient Component Strength (per inch Coefficients of material) Test Criteria Conventional Materials HMA 0.44 See Section 9.6.3 *Existing bituminous pavement 0.20-0.40 N/A Aggregate base course 0.14 ft -value ?83 Aggregate base course 0.12 77≤ R -value <83 Aggregate base course 0.11 69≤ R -value <77 Existing aggregate base course 0.09 N/A Treated Materials Fly ash 0.10 7 -day, 150 psi Lime treated subgrade 0.14 7 -day, 160 psi Cement treated base 0.22 7 -day, 100-200 psi Cement treated base 0.23 7 -day, 200-300 psi *Falling Weight Deflectometer or CDOT structural layer coefficients of existing pavements forms will be used to determine the structural coefficient for existing bituminous pavements. 9.5.5 Pavement Thickness Full -depth pavement sections will not be allowed within the County -maintained right-of-way. A composite section of hot mix asphalt (HMA) and free draining sub -base material will be used. Total HMA thickness will not be placed in lifts less than three times the nominal maximum aggregate size of the mix being used. 9.5.6 Pavement Design All pavement design will be prepared in accordance with AASHTO and CDOT pavement design procedures. A computer -generated printout of the design and/or other design calculations must be included with the design submittal. In lieu of design, 12 inches of HMA over 12 inches of aggregate base course (ABC) will be the minimum. 9.6 MATERIAL SPECIFICATION 9.6.1 General All sources of mined or manufactured materials used within the County -maintained right-of-way must be approved annually by the Public Works Department. 9.6.2 Procedure for Material Source Approval On or before April 1 of each year, or a minimum of 14 calendar days before beginning construction, materials suppliers will supply written documentation and material test results from a materials testing laboratory. These will indicate the following: • That the material(s) being tested meet(s) the minimum specifications • The test procedure employed • The material test results WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A u 121 A signed statement will be provided by the material suppler certifying that the materials tested are representative of the materials to be provided during the coming 365 -day period. 9.6.3 Hot nix Asphalt HMA will meet the requirements of and be placed according to Table 9-8 below and the latest edition of CDOT's Standard Specifications for Road and Bridge Construction. The 100 gyration mixes should be used on arterial and collector roads. 75 gyration mixes to be used on minor and major residentials roadways. HM 5 leveling courses, mid mats, and residential wear courses to be 64-22 mixes with a maximum of 2)% RAP used in aggregate gradation. HMA topping or wear course should be an SX 64-28 mix with a ma) imum of 20% RAP, on arterial and collector roads. Table 9-8 Master Range Table for Hot Mix Asphalt from Table 703-4 in CDOT's Standard Specifications for Road and Bridge Construction Percent by Weight Passing Square Mesh Sieves Sieve Size Grading Mi4 Grading ST Grading SX Grading S Grading si; 37.5 mm (1vin ) 100 25.0 on mm ) 100 90 100 I 19.0 /a') mm 100 90 14 f i 12.5 mm • ) 1 9.5 iiu fang') 1 W1(u 00 100 4.75 (IA) mm 90 100 4 2.36 mm * Th.�_,� 3, t, (#8) I _15 1.18mm (#16) 30-54 600 µm : Y is (#30) 300 (#50) pm 150 (#100) pm ?S µin (#200) 2- 12 2 - 10 2- 10 2_N 1 ,7 * These additional Form 43 Specification Screens will initially be established using values from the As Used Gradation shown on the Design Mix. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 1122 9.6.4 Portland Cement Concrete Pavement Portland Cement Concrete Pavement (PCCP) materials will meet the requirements of and be placed according to Table 9-9 below and the latest editions of CDOT's Standard Specifications for Road and Bridge Construction and CDOT's M&S Standard Plans. Table 9-9 Concrete Aggregate Gradation Table from Table 703-1 in CDOT's Standard Specifications for Road and Bridge Construction Coarse Aggregates (from AASHTO M43) Fine Sieve Sin' No, 3 No. 357 \o. 4 No. 467 No. 57 No. 6 No. 67 No. 7 No. $ Aggregate 50 mm �'�� mm �„ {.. ,�t�. 1") 50 uuii to 4.75 mm L " to No 4: ;" 3 nun << ' ' : ; I t l I I " . , 37.5 to 4.75 1 t,`n ( mrii mm to 4 25.0 mm �'�: mm " (1 to "41 19.o min to 9.5 mm 3, .. to ( ") 19.0 4.75 ,,�,� ( #4) to mm mm to 12.5 mm to 4.75 mm ,,_,. to ( #4) 9.5 mm to 2.36 mm ( s " #8) to 4.75 150 (#4 #1001 mm to gm to - 63 (2W) 50 mm 37.5 (PA") mm (2") mm 100 100 `H, 35-70 -1(1(1 - 90-100 Ho 95-100 Ho o - 1 9, IR (! O l 10 l u'; i 'II - - 90 20-55 0 o Ho 1(10 10 5 90-100 35-70 t0— 1c 100 '' _-T,'' 2.5.0 mm (1n) 90-1O 40-70 IOU i 0(? 20-55 100 U, LS ;, 10 0 30 19.0 mm wig) 12.5 mm (1/2") 9.5mm e/81 100 �,�-� lip I -I 1 } Is 85-100 mu (1 0 15 10 o '.)� Hi (I - _ u - (1 5 4.75 mm 0 0 10 t1 Bill () 5 2.36mnm (#8) 1 5() 8 1.18mm (#I6) 25-60 600µm (#30) iii ;Ii 300µm (#50) 2 10 - - 150 pm µ (# 100) 9.6.5 Aggregate Base Course ABC used in the pavement sections shall be crushed angular manufactured aggregate Class 6, unless otherwise approved. Class 6 Aggregate Base Course will meet the requirements in Table 9-10, which shows the gradation requirements, PI requirements, and LA Abrasion requirements. The minimum R - value shall be 69. Angularity of aggregate shall have a minimum fractured faces of one or more as per ASTM D 5821 of 45% or more. Recycled Concrete Product (RCP) aggregate base course shall not be used as shouldering material or as an exposed layer. RCP will be covered by a subsequent layer. The liquid limit shall be as shown in Table 9-10 and the plasticity index shall not exceed six when the aggregate is tested in accordance with AASHTO T 89 and T 90 respectively. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 123 Table 9-10 Aggregate Base Course Requirements Sieve Design ation Mass Percent Passing Square Mesh Sieves LL not greater than 35 LL not greater than 30 Standard Mesh 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 ABC RAP mm n ' Class 150 6" 100 100 4" 100 75 3" 95-100 63 2.5" 100 50 2" 95-100 100 100 37.5 1 5" 90-100 100 25.4 1" 95-100 100 85-100 19 3/4" 50-90 100 75-100 12.5 _,'2" 55-90 9.5 3,'8" - 45-80 4.76 l' c . 4 30-65 30-50 30-70 30-65 25-55 2.38 N c. 8 25-55 20-85 1.18 ND. 16 5-55 0.42 ND_ 40 0.07 Nc . 200 3-15 3-15 20 max 3-12 3-15 3-12 5-15 0-5 Plasticity index 0 0 0 <6 <6 <6 <6 <6 LA wear test (T)6) 50 max 50 max 9.6.6 Aggregate Surface Course (Gravel) Aggregate usec as surface course will meet the following requirements, unless otherwise approved. Furnish hard, d;. -able particles or fragments of crushed stone, crushed slag, or crushed gravel conforming to The following: 1. Los Angeles abrasion, AASHTO T96 2. Mecha iically Fractured faces, one or more, ASTM D 5821, crushed material, not s:r?ened, to attain fractured face 3. Free from organic matter and lumps or balls of clay 4. Liquid Limit, AASHTO T89 %passing #200 5. Dust rat o: %passing #40 6. Gradat on and plasticity index, AASHTO T90 40% 45% min. 30 max. 2/3 max. As shown in Table 9-11 Do not use matE rial that breaks up when alternately frozen and thawed or wetted and dried. Obtain the aggregate gradation by crushing, screening, and blending processes as necessary. Fine aggregate, material passing the No 4 sieve, will consist of natural or crushed sand and fine mineral particles. Do not furnish material that contains asbestos fibers. Recycled concrete cannot be used as surfacing gravel. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 1124 Table 9-11 Aggregate Surface Course Requirements Sieve Designation Mass Percent Passing Square Mesh Sieves Standard(mm) Mesh (in) Aggregate Surfacing 150.00 6 100.00 4 75.00 3 63.00 2.5 50.00 2 37.50 1.5 100 25.40 1 90-100 19.00 3/4" 12.50 1/2" 55-80 4.76 No. 4 45-65 2.38 No. 8 33-53 0.42 No. 40 15-35 0.07 No. 200 4-15 Plasticity index 6-16 LA wear test (T96) 40 max 9.7 SOILS/PAVEMENT DESIGN REPORT The soils/pavement design report will include the following information: 1. Vicinity map of investigated area 2. Transparent overlay of proposed project "plan view" on vicinity and boring location drawings. 3. Scaled drawing showing the location of borings 4. Scaled drawing showing the estimated extent of subgrade soil types, thickness of base material, thickness of and HMA 5. A spreadsheet showing all the factors used to calculate the design ESALs 6. Summary sheet listing all sample designations, liquid limit, plasticity index, percent passing the No. 200 sieve, AASHTO classifications, group index, soil description, R -value, moisture content, percent soluble sulfate, and pH 7. A discussion regarding potential subgrade soil problems, including, but not limited to, soils with swelling potential, frost -susceptible soils, groundwater, drainage considerations (surface and subsurface), cold weather construction (if appropriate), soluble sulfates and pH in the subgrade, and other factors or properties that could affect the design or performance of the pavement system 8. Recommendations to alleviate or mitigate the impact of potential subgrade soil problems 9. Pavement design alternatives for roadway 10. Pavement mix types to be used for the project 11. Any deviations from the County criteria and discussion/justification of the deviation, a formal request will be submitted for approval of the design alternative 12. Signed and stamped by a Professional Engineer licensed in the state of Colorado. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A G E I 125 CHAPTER 10 CONSTRUCTION CRITERIA 10.1 GENERAL For the public ;afety, health, and well-being, it is crucial to ensure that proper construction practices and industry standards are followed. The construction criteria defined within this chapter will be used for any work & ithin the County right-of-way and any infrastructure proposed for County rraintenance. In this chapter the "contractor" is the individual, company, landowner, developer, or other entity legally responsible foi the construction work. Unless otherwise indicated, the term "engineer" refers to the current Court\ Engineer or his/her authorized representative, the term "department" refers to the Weld County Public Works Department, and the term "inspector" refers to the current Weld County lead construction inspector or his/her authorized representative. 10.1.1 Polic} on the Use of Referenced Publications The information provided herein summarizes and/or supplements minimum standards that have been prepared in great detail by CDOT. The most recent publications of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction a id M&S Standard Plans are recognized by Weld County as being the primary documents used by transp-tation contractors and construction crews. However, CDOT policies represent statewide standards, whi:h do not always satisfy local conditions. When standards differ, the most recent version of the Weld Cowa.nty Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specri ations for Road and Bridge Construction will govern followed by the instructions and guidance in thi; :hapter will govern. All construction traffic control devices and their use must be in accordance with the latest version of the MUTCD. 10.1.2 Control of Work and Inspection The Department is responsible for oversight and inspection of construction that takes place within the County right-ot-way and for infrastructure proposed for County maintenance. In addition to the primary goal of promot rg public safety, the goal of County oversight —which takes the form of establishing standards and conducting inspections —is to help ensure quality construction and thereby minimize the long-term mair tenance costs associated with County -maintained infrastructure. The County has the authority to impDse standards on construction work and determine whether it has been ccnstructed in accordance with approved plans. The contractor is responsible for staying informed about and complying with all federal, state, and local laws, ordinances, and regulations that may affect the work or impact those employed to do the work. The contractor will indemnify the County against any claim or liability arising from the County's actions. Failure to meet these conditions can result in suspension of the work by the Department. The Departmer t will have the authority to suspend work if the contractor has failed to maintain safe conditions for the public. Such notification will be presented to the contractor in written form, at which time work wi I cease immediately —except for any activities necessary to position traffic control devices and put other sa rety measures in place to leave the project site in a safe condition during the shutdown, as directed by the engineer. The engineer will be the final authority in matters related to the proper WELD COUNT! ENGINEERING & CONSTRUCTION CRITERIA PAGE 126 interpretation of approved plans and will make final determinations when discrepancies in the plans or disputes between the inspector and the contractor occur. The inspector will have the authority to inspect all work and materials being used. The role of the inspector is to use acceptable engineering techniques and professional judgment to determine if the construction is being accomplished according to the methods described in the standards. The contractor will cooperate fully with inspection efforts, allow access to all parts of the work, and furnish any information required for complete and detailed inspections. Inspection by the department will not relieve the contractor or its designated representatives of the responsibility to control the work and ensure compliance with the approved plans and specifications for the project. 10.1.3 Project Acceptance and Warranty All work that does not conform to the standards and the approved plans whether resulting from poor workmanship, use of defective materials, or lack of care will be considered unacceptable work. Unacceptable work will be subject to removal and restoration prior to final acceptance of the project by the County. Disputes related to the acceptability of work will be subject to a final determination by the engineer. Upon written notice from the contractor of the completion of all work, the inspector will make a final inspection. If all project work is determined to be in compliance with the standards, the approved plans, the performance guarantee, the subdivision improvement agreement, and the contract agreement or other applicable agreements, the County will initiate the procedure for final acceptance and perform an inspection for final acceptance. If the inspection discloses any work as being unacceptable, the Public Works Department will notify the contractor in writing. After corrections have been made, another final inspection will be scheduled. The contractor will be responsible for maintenance and traffic control until final acceptance of the project has been granted by the Public Works Department. Final acceptance does not relieve the developer and/or contractor of a minimum two-year warranty on all workmanship and materials incorporated into the project, unless specified otherwise by the County. The warranty period will commence on the same date that written final acceptance is granted. Prior to the end of the warranty period, the inspector will arrange for the project to be inspected and will notify the contractor of any work items to be completed. 10.2 CONTRACTOR RESPONSIBILITIES 10.2.1 Qualifications, Insurance Requirements, and Licensing Any contractor performing work within the right-of-way will have the qualifications to complete the work in an acceptable and timely manner and will receive the necessary permit(s) from the Public Works Department before beginning work. Contractors will be fully licensed, insured, and possess a valid IRS Taxpayer Identification Number. The Department reserves the right to suspend or deny work being performed by any contractor or business that has been determined by the engineer to be unqualified to perform construction within the right-of-way. The contractor will indemnify the County from lawsuits and claims of any type that may occur as a result of its actions while performing work within the right-of-way. Until final acceptance of the project, the WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1127 contractor will procure and maintain insurance coverage in the minimum amounts specified in the most recent version of the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction from an insurance company authorized to cc business in the State of Colorado. 10.2.2 Pre -Construction Meetings Contractors shall be required to schedule and attend a pre -construction meeting prior to starting work on complicatec projects. The engineer can waive this requirement if the project is small or straightforward and it is determined that a meeting is not necessary. Attendees at the meeting typically are the contractor's key personnel, subcontractors, material suppliers, utility companies, material testing firms, tie County inspector, and the County engineer. The meeting typically is held at least one week prior to s:art of construction. The pre -constriction meeting agenda likely will include the following: • Exchange of contact information (phone numbers, fax numbers, etc.) • ApplicEble safety requirements, contact information, and emergency procedures • Constr action traffic control requirements and methods • Construction schedule with key dates and benchmarks • Required contract paperwork (insurance, bonds, escrow, permits, etc.) • Material submittals and testing requirements • Special conditions and access requirements 10.2.3 Permi-s Permitting regL i-ements are discussed in Chapter 11 of this document. In addition to approved construction plans, Weld County often will require obtaining and adhering to all requirements of a Transport Perrr it, Right -of -Way Use Permit, Access Permit, Grading Permit, and Floodplain Development Permit. The contractor A'ill be fully informed and knowledgeable of all required state and federal permits. Weld County is not responsible for ensuring the contractor has satisfied permit requirements from other agencies. However, copies of fully executed permits will be furnished to the engineer or inspector upon request. 10.2.4 Public and Worker Safety All work will be conducted in a manner that minimizes obstructions to traffic and pedestrians. The safety of the traveling public and adjacent landowners is the most important issue on every construction project. Contractors must inspect and maintain the project to ensure safety, as they bear the sole responsibility fc r any accidents or injuries related to the construction. The Department has the authority to suspend wor< if the contractor has failed to maintain safe conditions. The contractor mill observe all rules and regulations of federal, state, and local health officials and departments. No workers are allowed to be required to work in unsafe surroundings or under conditions that are unsani-ary, hazardous, or dangerous. Contractors will be fully informed and knowledgeable of all current cons:ruction safety practices and protective equipment to be used for specific work conditions. WELD COUNT`. ENGINEERING & CONSTRUCTION CRITERIA PAGE 1128 The contractor is responsible for complying with all safety regulations governed by the Occupational Safety and Health Administration (OSHA). The inspector is not responsible for enforcing these regulations, but will monitor construction activities for obvious or suspected noncompliance with OSHA regulations and will report any such issues to the contractor and the engineer. If imminent danger potentially resulting in serious injury or death is identified in the construction area, and the contractor has failed to act immediately to correct the dangerous condition, the engineer can issue a written work suspension order. 10.2.5 Utility Coordination When excavating or grading in the area of underground utilities, the contractor will comply with Article 1.5 of Title 9, Colorado Revised Statutes, "Excavation Requirements." as modified by SB-18-167. The contractor will notify all affected utilities at least two business days prior to commencing work and will contact the Utility Notification Center of Colorado (UNCC) at 8-1-1 to have locations of UNCC-registered utilities marked onsite. All other underground facilities will be located by contacting the respective utility owner. Affected utility company representatives should be invited to the pre -construction meeting. Where the contractor's operations are adjacent to a utility owner's facilities, work will not commence until arrangements (acceptable to both parties) for the protection of the utilities have been made. The approved plans will clearly indicate those utility items that are to be relocated or adjusted by the utility owner and those utility items that are to be constructed by the contractor. The contractor will meet with the utility owners as often as necessary to coordinate and schedule relocations or adjustments. Weld County is not responsible for the actions of utility owners, and the contractor will not seek damages or claims against the County for coordination, inconvenience, delay, or damages sustained due to interference from the utility owners. 10.2.6 Dust Control The contractor is responsible for dust control related to its construction project. The contractor also is responsible for compliance with the Colorado Air Quality Control Act. The majority of construction sites can achieve adequate dust control by providing a water -spray truck to keep moisture in the exposed soil. Water trucks may be required on any construction sites that disturb an area of land greater than 1 acre, or for projects that are using gravel roads as the main access to the construction site. The goal of dust control is to prevent airborne particulates (dust) from leaving the construction site or access roads. Damages or health issues caused by dust leaving the construction site are the sole responsibility of the contractor. The contractor will be responsible for cleaning up and removing any dirt or dust that has left the construction site. Closure of a roadway often requires the contractor to set up a designated detour route for traffic. If the detour route uses an existing gravel road, dust mitigation and road deterioration can quickly become a problem. Such detours often will require the contractor to apply a durable dust treatment, such as magnesium chloride. The department will determine the quantity, frequency, and locations of such dust treatments. The contractor will need to use a county approved vendor which has a Right-of-way Use permit with the county for the application. The inspector will monitor the construction site and let the contractor know if dust control measures are inadequate. Reasonable complaints received by the County or contractor from adjacent landowners, or WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1129 the traveling public will be addressed by the contractor in 24 hours or less. Failure to respond to reasonable rec cests (as determined by the County) to provide dust control or failure to provide a water truck on the corstruction site can result in a written suspension of work order from the engineer. 10.2.7 Traffic Control During construction, the contractor will be responsible for supplying and maintaining traffic control devices accorcing to the requirements of the MUTCD. Any work within the right-of-way requires approval of the Method of Handling Traffic (MHT) by the department prior to work commencing. In addition, any road closure within the right-of-way that will last for three days or more requires approval by the BOCC p eior to work commencing. The contractor should allow at least two weeks prior to the planned road closure to obtain required approvals from the County. The contractor's MHT will be prepared by a person knowledgeable and qualified in the area of traffic control, who is a certified Traffic Control Supervisor (TCS). The MHT will be easily readable, prepared in a professional rr, finer, and include the following elements: • A project site location map • A diagram showing the location of all traffic control devices • A tabu ation of the sizes, types, and quantities of all traffic control devices • Locaticcr of all existing roads and accesses within the traffic control zone • Certifications of all TCSs and flaggers working on the jobsite Traffic control ievices will be inspected by the contractor's TCS for proper placement on at least a daily basis and wil ke inspected during the nighttime at least once per week. The reflective surfaces of all signs will be che:ked and cleaned on a regular basis, no less frequently than every two weeks. For safety reasons, the cc ntractor will not store materials or equipment near open travel lanes. Portions of the roadway that are open to traffic will be maintained, kept clean, and kept free of snow and ice by the contractor. The inspector will monitor the traffic control set-up to ensure the MHT is being followed and to look for any problems that need to be corrected. If the inspector deems that changes to the traffic control are necessary, this vAill be communicated to the contractor and/or TCS. 10.2.8 Removal of Unacceptable or Unauthorized Work Unacceptable work resulting from any cause found to exist prior to final acceptance of the project will be removed arc replaced in an acceptable manner at the contractor's expense. The construction of transportation facilities requires a high degree of precision and quality from the contractor. These facilities will eventually be used by the traveling public, who assume that safe and predictable driving and drainage cirnditions exist. Failure to remove and/or replace unacceptable or unauthorized work within the righ--of-way can expose the contractor to liability. The inspector i; authorized to ensure the contractor is following approved plans and specifications, to identify work that is unacceptable or unauthorized, and to communicate such findings to the contractor. The contractor will correct the identified work in a timely manner. If the contractor and the inspector disagree about whether work is unacceptable or unauthorized, the final determination will be made by the engineer. WELD COUNT ( ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 130 10.2.9 Record Drawings and Record Keeping Preparation and organization of project records and record (as -built) drawings is an important step for ensuring proper future maintenance of transportation facilities. This is especially true when the project includes construction of underground facilities. Changes in the scope of work, geometric design, structural plans, typical sections, standard plans, specifications, and corrections of design errors must be incorporated into the as -built plans. These as - built plans shall be sealed by the engineer responsible for changes. Information shown on the as -constructed plans should include, but is not limited to the following: Structures: • Show tip elevation of piling for each pier, wall, or abutment. • Show structure changes for both minor and major structures. • Show type, manufacturer, manufacturer's project number, and shop drawing number of bridge expansion and bearing devices installed. • Show elevation and placement of brass cap benchmarks, when used. The elevation should be project specific and marked on the plans. All temporary benchmarks on the plans will be lined out. • Vertical and lateral clearances should be indicated Plan and Profile: • Show the final location of new utility placements, unknown utility discoveries, relocations, and changes. Abandoned utilities should be shown and noted. • Show all geometric revisions to alignment, super elevation, and grade. • Show significant changes in revised slope catches specifically ordered in the field • Show final locations of minor structures. • Show locations of discovered underground features, such as foundations or pipes, which are left in place. • Show detailed information on the location of all buried material within the County right-of-way or project limits. • Detail any new or deleted accesses. Drainage Plans: • Meet the requirements of the As -Built Drawing Checklist provided in Appendix D of this document Prior to final acceptance of construction work, the contractor will turn in all requested as -constructed information, materials testing information, electronic files, and submittals to the inspector for review. The As -Built drawings shall follow the requirements for As -Constructed drawings that are set for in the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge Construction WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE: 1131 10.3 MATERIALS QUALITY CONTROL AND TESTING 10.3.1 Qualifications of Testing Personnel and Laboratories Materials Process Control testing is an important and necessary part of any successful transportation project. Testin of construction materials (soil, concrete, asphalt, etc.) ensures the owner and contractor that suppliers are providing the materials specified and adequate construction methods are being used. CDOT qualifications related to materials are covered extensively in CDOT's Colorado Procedure 10 (CP10). It shou be noted that Weld County does require the contractor to meet the qualifications for testing perscn-el described in CP10. All process control testing by consultant or material testing firms should be done n accordance with AASHTO and (CP) Colorado Procedures as directed in the CDOT Field Materials Marxu2l - OA Frequency Guide Schedule for Minimum Materials Sampling, Testing and Inspection. The AASHTO a ,d CDOT Field Materials Manuals have developed and published detailed and specific standard procE dures to be used for materials testing. The contractor will be responsible for providing material testin that meets the requirements of the applicable testing standard. The inspector will provide oversight to ensure material testing is being performed properly and that testing laboratories being used are adequate. 10.3.2 Minimum Testing Types and Frequencies The contractor Bill make arrangements to provide material testing of the types and frequencies described in :he latest version of the Weld County Department of Public Works Conformed Standard Special Revis,b,is to CDOT Standard Specifications for Road and Bridge Construction. The inspector may accept some reduction in inspection and testing procedures under certain conditions. If the contractor does not intend to meet the minimum testing frequencies listed in the frequency guide schedule in the latest version c- the Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standarc Specifications for Road and Bridge Construction, it must provide a written explanation to the inspector at least 48 hours prior to start of the related construction. Examples of conditions under which the minimum testing frequencies may be reduced by the inspector could include: • Very s —all quantities of materials are being used. • The construction work is taking place outside of the roadway structural prism. • The construction work is temporary in nature. • The inspector has determined that construction methods being used easily exceed minimum requirements, thereby resulting in predictable passing test results. 10.3.3 Mater al Sources and Sampling All material so, -ces used will meet the requirements of the approved plans and specifications. If the contractor inte ads to use any materials that do not meet the requirements as described in the County criteria, it must provide a written description and request prior to or at the pre -construction meeting. The engineer tr en may choose to review the information and grant a variance prior to construction starting. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 1132 The inspector will be granted access by the contractor to sample and test all material to be incorporated into the work. Failure to allow such access will result in a suspension of work order being issued by the engineer. The inspector reserves the right to request proof from the contractor that materials being delivered to the jobsite are coming directly from approved sources. All materials will be handled and delivered in a manner such that their quality and acceptability are not adversely affected during the process. Aggregates and pavement mixes will be delivered to the jobsite in trucks designed to prevent loss or segregation of materials. The contractor will be aware that if materials delivered to the jobsite show excessive segregation, disturbance, or contamination, they may be rejected by the inspector. HMA that has cooled excessively also may be rejected by the inspector. 10.3.4 Required Submittals Contractor submittals given to the County for review and approval will vary for each project, depending o n the scope and complexity of the work to be performed. A simple Access Permit or utility crossing may n ot justify multiple submittals, while a large-scale bridge or roadway construction project may require many submittals. The contractor will consult with the engineer prior to the pre -construction meeting for a specific list of required submittals. A typical large-scale project could include submission, review, and approval of the following documents: • MHTs • Construction schedule • Shop drawings or fabrication details • Concrete and asphalt mix designs • Soils laboratory test information • Manufacturer's product data and installation instructions • Copies of required worker's certifications and qualifications • Certificates of compliance and material samples • Documents required by County Codes or by the Planning Department 10.3.5 Soils Reports and Pavement Designs To ensure proper design of roads and bridges, the department will require the contractor to provide a soils report and associated pavement design. In certain cases, the engineer may waive these requirements. Specific requirements are described in Chapter 9 of this document. 10.3.6 Materials Rejection Materials that do not meet the requirements of the approved construction plans and specifications will be rejected by the inspector. Rejected materials will be removed from the right-of-way in a timely manner at the contractor's sole expense. The contractor may choose to perform additional third -party materials testing in an effort to reverse the inspectors' decision. However, in no case will rejected materials be covered up or incorporated into the work without approval. In cases where the contractor and the inspector disagree on a materials rejection issue, the engineer will make the final decision. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A 6 t 1133 10.4 EXCAVATION AND EMBANKMENT 10.4.1 Utility Trenching and Backfill Requirements All utility treniines underneath or within 5 feet of a public roadway will be backfilled with suitable materials and mechanically compacted to not less than 95 percent of maximum density, as determined by AASHTO TS J. This work will require the contractor to arrange and pay for the applicaole materials quality control testing. The exception to this requirement is underground utilities that are bored into place or installed by similar methods which do not disturb the surrounding soils. Alternative backfill u sing an approved flowable cement fill (flow -fill) mix design can be used instead of soil materials, e liminating th; need for onsite compaction testing. Weld County Standard Flow -Fill Mix: • Slump of 7 to 10 inches - ASTM C143 • Compressive Strength F'C-1,000 PSI @ 28 days • ASTM 150 Type I -II, minimum 329 pounds • Course Aggregate ASTM-33—Minimum 1,000 pounds • Fine Grain Aggregate ASTM-33—Minimum 2,000 pounds • Air En raining Agent (SIKA Air) ASTM-C260 Minimum 1.0 oz./cubic yard • Water Minimum 150 pounds All utility trenc,les located more than 5 feet away from a public roadway will be backfilled with suitable materials and mechanically compacted to not less than 90 percent of maximum density, as determined by AASHTO T99. The inspector may choose to waive the requirement for materials testing in these cases if s/he believe: that proper construction methods are being used to ensure good compaction, or if flow - fill is being use J. The departme' : reserves the right to perform material testing on any utility trench being constructed within the rigl---of-way. If the material testing performed by the department shows that the contractor has failed to rr ?et or exceed the compaction requirements described above, the contractor will be directed to rerr cve and recompact the backfill and/or pavement materials at its own expense. See Section 1C.7.5 for Pavement Cuts and Patching Requirements. 10.4.2 Unsuitable Materials Soil materials used in embankment construction will be as recommended in the approved soils report for the project. Soil materials that do not meet the requirements of the soils report are identified as being "unsuitable materials" and will be removed from the jobsite. Projects that do not have an approved soils report will follow more general requirements for the materials to be used. Embankment and fill material will be free of ice, organics, trash, glass, chemicals, and other deleterious materials. When tested by a Hveem Stabilometer, the soils will have a minimum R -value of at least R-20 and a maximum dry density of not less than 120 pounds per cubic foot. 10.4.3 Moist Lre and Density Control Moisture and density control will follow CDOT's Standard Specifications for Road and Bridge Construction. WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 134 The contractor will be responsible for material testing to confirm that proper construction methods are being used and that the moisture and density requirements are being met. Moisture and density testing requirements may be waived by the inspector in cases where the amount of embankment being constructed is small or the embankment being constructed is not intended to be used for a public roadway. However, the inspector is not authorized to waive or relax the testing requirements described in an approved soils report. 10.5 SUBGRADE CONSTRUCTION METHODS 10.5.1 Unsuitable Materials Suitability of subgrade materials is equal to that described for embankment materials in Section 10.4.2. Subgrade materials that are deemed unsuitable for construction will be removed from the jobsite. 10.5.2 Soft Spots Subgrade areas that cannot be constructed initially to meet compaction requirements or support traffic loads using standard, acceptable construction methods are commonly referred to as "soft spots." Repair of soft spots typically is addressed by first trying methods that require little time and expense, then progressing to more costly methods if necessary. In cases where soft spots are numerous and extensive, where the soft spots are so bad that standard construction equipment cannot access the area, or where soft spots present a dangerous work condition, the contractor will consult a Professional Engineer or Professional Geologist for recommendations for proper construction methods. The following are some of the methods used to repair soft spots: • Scarifying/drying/blending the onsite soils and then recompacting • Over -excavating and backfilling with suitable onsite soils • Over -excavating and backfilling with imported granular fill • Over -excavating and placing geogrid or geotextiles, then backfilling with imported granular fill • Subgrade treatment of onsite soils with cement, fly ash, or other approved materials The success or failure of any of these methods will be determined by extensive proof rolling and inspection. 10.5.3 Moisture and Density Control Subgrade moisture and compaction requirements are similar to the requirements for embankments but are a little more stringent since subgrade materials are a component of the overall roadway structural section. If the subgrade materials fail to meet the conditions required in the overall pavement design, the aggregate base and pavement sections are likely to fail prematurely. Moisture and density control for subgrade will follow CDOT's Standard Specifications for Road and Bridge Construction. The contractor will be responsible for material testing to confirm that proper construction methods are being used and that the moisture and density requirements are being met. When the final subgrade surface elevations have been established, proofrolling and inspection will be performed before any aggregate base is placed on top of the subgrade. 10.5.4 Subgrade Proof Rolling The department requires proof rolling of subgrade materials, observed by the inspector, to determine their adequacy to support heavy loads. This work typically is accomplished with a heavy rubber -tire WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A G E 1135 truck, such as 3 water truck, that can generate a minimum axle load of 18,000 pounds per axle. The inspector may require the contractor to provide a certified weight ticket as proof that adequate proof rolling equiprrE it is being used. The subgrade will be proof rolled after the required compaction has been verified c4'ith materials testing equipment and the subgrade has been graded to the required elevations cal .d for in the plans. The inspector 'Jill be notified at least 48 hours prior to any subgrade proof rolling. No proof rolling will be accepted without the inspector or designee present. Upon approvz of the proof rolling, the contractor will place the aggregate base course on top of the approved subgrade materials within 48 hours. If the contractor fails to place the aggregate base course within 48 hours or the moisture conditions of the subgrade change due to inclement weather or other conditions, pr: ;f rolling will need to be repeated. 10.5.5 Treat HI Subgrades Subgrade soils can be treated with cement, fly ash, lime, or other approved stabilizing agents. This approach is a :ost-effective way to avoid over -excavation of unsuitable soils over large areas. Subgrade treatment also is used to raise the structural value of the soils, thereby allowing the designer to require less thickness o= aggregate base course and pavement. Another reason for the use of stabilizing agents is to reduce the !well potential of certain clay soils. Specific moist_ re and density control requirements vary, depending on the type of stabilizing agent used. Prior to placement of any subgrade treatment, the contractor will submit a mix design to the inspector for a Dproval. The contractor also will supply the inspector with information regarding the type of delivery, miz.ng, watering, grading, and compaction equipment to be used during construction. 10.6 BASE COURSE CONSTRUCTION METHODS 10.6.1 Gradation and Moisture and Density Control Overall pavement quality, including structural longevity and riding smoothness, is greatly affected by the quality of the Lnderlying subgrade and base course materials. Base course materials must meet specified gradation and moisture and density control requirements to adequately support the traffic loads. The department requires a minimum of 4 inches of compacted aggregate base course underneath any permanent paved road surface. Depending on the pavement design, subgrade R -value, predicted traffic loading, and other applicable factors, greater thicknesses of aggregate base course often are required. The : ase course provides the pavement structure with a free -draining, non -frost -susceptible material layer 1 hat distributes the traffic loads from the pavement surface to the underlying subgrade. Aggregates for bases will be crushed rock, native or crushed gravels, crushed recycled concrete, or crushed recycle: asphalt materials. Base course gradation will be as specified in CDOT Specifications: Class 5 or Class 5 materials. Class 6 Aggregate Base Course typically is used for areas directly underneath the permanent caved surface. Class 5 Aggregate Base Course typically is used for "shouldering" the areas adjacent to the edges of the permanent paved surface. Shouldering materials shall not contain crushed or recs sled concrete materials. Prior to any placement of materials, the contractor will submit a laboratory gray: ation test to the inspector verifying specifications are being met. The contractor also will grant the inspe:tor access to any stockpiles or sources of base course to be used on the project. WELD COUNT ( ENGINEERING & CONSTRUCTION CRITERIA PAGE 1136 The maximum compacted thickness of any individual lift of base course will not exceed 6 inches. Multiple lifts will be required when the thickness is greater than 6 inches. Compaction of each layer will meet a density of at least 95 percent of the maximum density determined in accordance with AASHTO T- 180. Water should be uniformly applied to ensure this compaction requirement has been met. The final surface elevations of the base course will be graded to within .04' of the elevations specified on the plans. Placement shall be performed utilizing side -dump or belly dump haul equipment. With the exception of smaller area placement where material can be placed with little segregation using loader or skid steer equipment. Mixing, moisture conditioning and grading shall be done with rubber -tired equipment to prevent breakdown of aggregate and gradation. End dumping and Dozer grading is not allowed unless authorized by a Weld County Engineer. If material is stockpiled for any length of time, care should be taken in the maintenance of the pile to prevent segregation of the material. 10.6.2 Base Course Proof Rolling The department requires proof rolling of base course materials under observation of the inspector to determine the adequacy to support heavy loads. This work typically is accomplished with a heavy rubber -tire truck, such as a water truck, that can generate a minimum axle load of 18,000 pounds per axle. The inspector may require the contractor to provide a certified weight ticket as proof that adequate proof rolling equipment is being used. The base course will be proof rolled after the required compaction has been verified with materials testing equipment and the base course has been graded to the required elevations called for on the approved construction plans. The inspector will be notified at least 48 hours prior to any base course proof rolling. No proof rolling will be accepted without the inspector or designee present. 10.6.3 Treated Base Courses Base courses can be treated with cement to obtain a stiffer and stronger material than an unbound base. A stiffer base reduces deflections due to traffic loads, which results in lower strains on the pavement surface. This approach can be a cost -saving measure that allows the designer to require less thickness of pavement. Cement -treated bases need to be designed for each specific project. The structural properties of cement -treated base depend on the soil/aggregate material, quantity of cement, curing conditions, and age. The contractor will be responsible for submitting a mix design to the inspector for review and approval prior to construction. Specific moisture and density control requirements vary, depending on the cement -treated base mix design. In addition to having an approved mix design, samples of the cement -treated base will be taken during construction, and laboratory tests will be conducted to verify that the minimum strength properties specified have been achieved. The contractor also will supply the inspector with information regarding the types of delivery, mixing, watering, grading, and compaction equipment to be used during construction. In addition, the inspector may require copies of certified weight tickets for the cement to verify proper quantities have been incorporated into the base course. All testing of processed cement - treated base material or its individual components, unless otherwise provided specifically in the approved construction plans and specifications, will be in accordance with the latest applicable AASHTO or ASTM material specifications. The final surface elevations of the cement -treated base course will be graded to within one -quarter inch of the elevations specified on the plans. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G h, I 137 10.6.4 Acceptance Prior to Paving Upon approva of the proof rolling, the contractor will place the pavement surface (if applicable) on top of the approve) base course materials within 48 hours. If the contractor fails to place the pavement surface within 48 hours or the moisture conditions of the base course change due to inclement weather, excessive dryi e g, or other conditions, proof rolling will need to be repeated. The inspector E responsible for giving the contractor final approval to proceed with placement of the pavement surs3ce on roads and bridges within the right-of-way. The contractor will furnish copies of certified loac - ckets for the base course materials as proof that the correct type and quantity of base course was der kiered to the jobsite. When the inspector determines that base course placement is acceptable, a p re -paving meeting can be held. 10.7 PAVEMENT CONSTRUCTION METHODS 10.7.1 Pre -Paving Meetings Pre -paving meetings are mandatory on any road or bridge project that requires placement of asphalt or concrete perm anent pavement more than 500 tons of HMA Pavement or 2,000 SY of Concrete Pavement. The meetings will be scheduled and arranged with the inspector. Attendees at the pre -paving meeting generally include the contractor superintendent, paving foreman, materials quality control tester, TCS, material supplier representative, engineer, and inspector. The asphalt or concrete mix design will be Ribmitted, reviewed, and approved by the inspector prior to the pre -paving meeting. Pre -paving meetings typically are held on the jobsite. Following is a partial list of the general items for discussion: • IntroJL :tions and attendance roster with contact information • Assignment of specific duties • Scheduling, construction sequencing, and traffic control requirements • Materi :Is quality control methods and requirements • Types of hauling equipment and paving equipment to be used • Construction details, such as lift thicknesses, joint construction, and pavement striping • Conditions under which paving will cease (bad weather, darkness, holidays, etc.) 10.7.2 Recycled Asphalt Pavement Surfaces Weld County bJs constructed roads using recycled asphalt pavement (RAP) as the pavement surface for interim cross sE:tions instead of gravel. This typically is accomplished as a permanent means of dust control and is less costly than HMA. Candidate roads for RAP pavement are gravel roads that have a high e nough ADT to make grading and dust control maintenance a significant effort, but low enough ADT to n ot warrant pe -nanent HMA pavement placement. 10.7.3 Hot Mt( Asphalt Surfaces Most County roads with permanent paved surfaces are constructed with HMA. This type of surfacing suits the Coun-, needs well since our road crews are knowledgeable and well equipped to properly maintain aspha t roads. The current edi:ian of the CDOT Standard Specifications for Road and Bridge Construction, Sections 400, 403, 702 and 703 provide material specifications and construction methods generally acceptable to WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 1138 Weld County. Table 9-8 has the Master Range gradation requirements for Grading S (3/") on bottom, intermediate lifts and SX (%") for top lift placement are acceptable. Designs will require Performance Graded Binder of 64-22 on bottom and intermediate lifts, while top lifts will have 64-28 (Table 702-1 in CDOT's Standard Specifications for Road and Bridge Construction), other binder grades must be approved in writing by Weld County Engineer. Design air voids will be targeted at 3.5-4.5% under 100 gyrations. No more than 20% Recycled Asphalt may be used in the bottom and intermediate lifts. Top lift will utilize virgin aggregate in the mix design. No asphalt shingles can be used in the recycled asphalt products. Prior to any asphalt placement, the contactor will submit an asphalt mix design to the inspector for approval, as described in Section 401.02(a) (1) and (2) of the CDOT Standard Specifications. The inspector reserves the right to perform a site visit and inspect the facilities of any asphalt supplier used. During construction, the contractor will furnish copies of certified load tickets for the pavement materials as proof that the correct type and quantity of pavement materials were delivered to the jobsite. The minimum and maximum layer thickness will be as specified by CDOT Specifications for the type of asphalt mix being used, or as otherwise specified in an approved pavement design report. The use of geosynthetics associated with asphalt pavement or mill/overlay operations will be approved by the engineer prior to use. 10.7.4 Concrete (PCCP) Surfaces PCCP construction is encouraged for high -volume intersections, industrial developments, and heavy truck routes. CDOT Specifications Section 412 provides material specifications and construction methods generally acceptable to the department. Prior to any concrete placement, the contactor shall submit construction plans which follow all the requirements in this guide but also include a joint layout plan and a construction phasing plan. The following standards including but not limited to the following shall be included in the project: 1. The Contractor shall also submit an optimized gradation concrete mix design to be reviewed and approved by the County. 2. A PCCP design shall be provided using the mechanistic empirical (ME) design criteria. If the recommended pavement thickness is less than 9 inches, the minimum concrete thickness shall be 9 inches. If the recommended concrete pavement thickness is more than 9 inches, the greater thickness shall be used. The minimum thickness of Class 6 ABC is 6 inches unless a greater thickness is recommended by the design. 3. A minimum of 1 layer of Tensar INTERAX NX650 geogrid or approved equivalent shall be placed beneath the Class 6 ABC and the subgrade on all PCCP project. The manufacturer's requirements for overlap shall be followed. Additional layers of INTERAX NX650 shall be required if stability and compaction of the subgrade cannot be achieved. 4. The concrete mix design shall contain no more than 20% fly -ash 5. Only non -chloride High early strength concrete mix designs may be used in some situations if submitted and approved by the County prior to construction. 6. All acceleration and deceleration lanes shall have a 4 -foot PCCP shoulder and a 2 -foot gravel shoulder. The gravel shoulder shall be composed of either Class 6 ABC or RAP. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 139 7. All other PCCP travel lanes shall have an 8 -foot PCCP shoulder and a 2 -gravel shoulder. 8. A safr j edge is required for the full length of the PCCP lanes except at driveway locations. 9. If an e (isting PCCP road is being widened, the existing safety edge and shoulder shall be removed prior to the construction of additional lanes. The additional lanes shal be constructed with a safety edge. 1O. The ni nimum 28 -day flexural strength for concrete paving shall be a minimum of 65O psi. Any concrete paving found to be less than this shall be removed and replaced. 11. All other material submittals such as aggregates, cement, joint sealant, curing compound, dowel bars, and tie bars shall be approved by the County prior to any concrete being placed. 12. Non -f .)1.ible fusion bonded epoxy coated (purple or black) carbon steel bars (dowels) shall be used in the wheel paths for load transfer between panels. The Simplex Time Capsule or Armor oat dowel bars are acceptable. 13. Dowe bar sizes vary depending on pavement thickness and expecting loading. Never to be less than 1 25". 14. All epcxj coated Tie Bars used in concrete pavement jointing will have no bare steel ends and require coating of epoxy paint prior to placement. 15. The tra isition between PCCP and HMA shall follow the Weld County PCCP to HMA transition deta I 16. Concrce paving shall be finished using a moistened doubled burlap drag for texture. Concrete texturing shall occur prior to curing compound being placed. 17. All nor -standard sized concrete panels shall be reinforced with 6 -gauge welded wire mesh 18. Concrete curing compound shall be White Water Linseed Oil Concrete Curing and Anti-spalling Comp: and or approved equivalent. 19. Joint sealant shall be Dow Corning 89O SL joint sealant or approved equivalent. 2O. Pavement markings placed onto finished concrete pavement shall follow Table 1O-1 below. Table 10-1 Pavement Marking Types on Asphalt and Concrete Roadways Surface Type Line Type Material Type CDOT # ITEM Existing Asphalt 6" White Edge Line Modified Epoxy 627-00008 4" Yellow Edge Line Modified Epoxy 627-00008 4" Double -Yellow Centerline Modified Epoxy 627-00008 4" White Extension Line Modified Epoxy 627-00008 4" White Skip Lane Line Modified Epoxy 627-00008 8" White Gore Area Modified Epoxy 627-00008 8" White Channelizer Modified Epoxy 627-00008 8" White Lane Drop Modified Epoxy 627-00008 8" White Double -Left Guide Modified Epoxy 627-00008 Stop Bar/Xwalk Preformed or Preformed Thermoplastic (Inlaid) Plastic (Inlaid) I 627-30411 627-30328 or Type WELD COUNT r ENGINEERING & CONSTRUCTION CRITERIA PAGE X140 Word Messa e/S mbol g y or Preformed Preformed Thermoplastic Plastic Type (Inlaid) I (Inlaid) 627-30407 627-30323 or New Asphalt 6" White Edge Line Modified Epoxy 627-00008 4" Yellow Edge Line Modified Epoxy 627-00008 4" Double -Yellow Centerline Modified Epoxy 627-00008 4" White Extension Line Modified Epoxy 627-00008 4" White Skip Lane Line Modified Epoxy 627-00008 8" White Gore Area Modified Epoxy 627-00008 8" White Channelizer Modified Epoxy 627-00008 8" White Lane Drop Modified Epoxy 627-00008 8" White Double -Left Guide Modified Epoxy 627-00008 Sto p Bar/Xwalk or Preformed Preformed Plastic (Inlaid) I (Inlaid) 627-30411 627-30328 or Thermoplastic Type Word Messa e/S mbol g y or Preformed Preformed Plastic (Inlaid) I (Inlaid) 627-30407 627-30323 or Thermoplastic Type Existing Concrete & New 6" White Edge Line Preformed Plastic II (Inlaid) 627-02010 Type 4" Yellow Edge Line Modified Epoxy 627-00008 4" Double -Yellow Centerline Modified Epoxy 627-00008 4" White Extension Line Modified Epoxy 627-00008 4" White Skip Lane Line Preformed Plastic II (Inlaid) 627-02010 Type 8" White Gore Area Modified Epoxy 627-00008 8" White Channelizer Preformed Plastic II (Inlaid) 627-02010 Type 8" White Lane Drop Preformed Plastic Yp II (Inlaid) 627-02010 Type 8" White Double -Left Guide Preformed Plastic II (Inlaid) 627-02010 Type Sto p Bar/Xwalk or Preformed Preformed Thermoplastic Plastic Type I (Inlaid) (Inlaid) 627-30411 627-30328 or Word Messa g e/S mbol y or Preformed Preformed Plastic Type I (Inlaid) (Inlaid) 627-30407 627-30323 or Thermoplastic Rollover Curb in Roundabouts Modified reflective Epoxy — Yellow beads with 627-00008 21. For epoxy pavement markings, the concrete curing compound must be removed along the marking layouts prior to placement of the epoxy. This can be accomplished using pressurized water or other methods as approved by the County. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1141 The County re ;erves the right to perform a site visit and inspect the facilities of any material supplier used during cc nstruction. The contractor shall furnish copies of certified load tickets for the pavement materials as p oof that the correct type and quantity of pavement materials were delivered to the jobsite. Traffic contro requirements for PCCP construction are a major concern because of the concrete curing time requirements. 10.7.5 Pavenent Cut and Patching Requirements Some roadwa, s in Weld County have a "No Cut" policy in place. Consult with the Public Works Department tc find out which roads fall under this policy. Construction work that requires removal of existing paved surfaces will require replacement with similar new pavement materials within a period of 48 hours, unle ;s otherwise approved by the inspector. Traffic control devices will not be removed until after the paved surface has been replaced. Removed RAP surfaces will be replaced with HMA. Where pavement is to abut existing pavement, the existing pavement shall be removes to a neat vertical line, using a sa,v or other method as approved, to create a clean construction "T -Joint". The contractor will also be rec; wired to paint the edge with diluted emulsified asphalt (slow setting) prior to paving operations. Th = rate of application shall be as determined by the engineer at the time of application. Contractor shad mill existing roadway to a minimum depth of 2 inches. The milling shall be a minimum of 2 feet wide :r a greater width so that the joint will not fall within the intersecting travel lane wheel path Construction it the winter will require temporary asphalt patching using cold -mix materials, then returning to :h Ei site to reconstruct with permanent patching using hot -mix materials when weather conditions al c' ir. All pavement removals will be saw -cut a minimum of 1 foot wider than the patching area. The new pavement patch material will be placed and compacted to a thickness at least 1 inch greater than the adjacent in -place pavement. The minimum dimension of both length and width of any pavement pate will be at least 4 feet to ensure adequate compaction can be obtained. The inspector may choose tc waive the requirement for pavement surface materials testing if they believe that proper construction methods are being used to ensure good compaction. Pavement cut and patching requirements for concrete pavements will require review and approval by the inspector. Concrete patching typically requires insertion of steel dowel bars into the adjacent pavement. Prc :er curing and jointing methods also must be used. Improper consi ruction of pavement patches is a problem in Weld County. Poor construction methods may result in c ingerous bumps or dips in the traveled roadway. If such conditions are identified by the department Zvi :hin two years after construction, the contractor will be notified in writing to reconstruct the pavement patch properly. Failure to meet the conditions described in the written notice from the department cal result in emergency repairs being performed by County crews. In such cases, the contractor will J invoiced to reimburse the County for all costs associated with the roac repairs. WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA PAGE 1142 10.8 STRUCTURES AND DRAINAGE FEATURES 10.8.1 Bridges Unless otherwise approved by the engineer, bridges will be designed and constructed according to the most current requirements of AASHTO's LRFD Bridge Design Specifications, CDOT's Bridge Design Manual, CDOT Standard Specifications, and CDOT Standard Plans. If alternate designs or construction methods are being proposed by the contractor, the engineer will provide specific submittal requirements. The design and construction of any bridge within the County right-of-way will be overseen by a Professional Engineer licensed in the state of Colorado. 10.8.2 Culvert and Pipe Installation Culvert and pipe installation will be completed according to the requirements of CDOT Specifications Section 603 and Standard Plans, unless otherwise described in Chapter 5.6.4 and Chapter 5.8 of this document. Pipes constructed in right-of-way for private driveway access in rural areas will be at least CMP, or an approved equal, and will have a minimum diameter of 15 inches. Pipes constructed under the travel lanes of a new public roadway will be RCP, or an approved equal, and will have a minimum diameter of 15 inches. All culverts and pipes must be installed with a minimum of 12 inches of cover above the pipe crown and bell to the bottom of asphalt at the edge of pavement (for paved roads) and a minimum of 12 inches of cover above the pipe crown to the top of the finished grade (for gravel roads). If 12 inches of cover is not possible, the culvert material must be rated for a minimum of HS -20 loading or the largest expected loads crossing it (i.e., oil rigs, semi -trucks, etc.). The contractor must provide shop drawings for any precast concrete box culvert (CBC), which will be reviewed and approved for use by the engineer. HDPE, ADS, or other plastic pipes that cannot withstand fire will not be allowed. It will be the responsibility of the contractor to protect pipe materials from damage during shipping, unloading, and installation. Any damaged pipe materials (as determined by the inspector) will be removed from the jobsite. The construction elevation tolerance for pipes will be within 0.5 inches of the design elevation called for on the approved plans. 10.8.3 Curbs, Gutters and Crosspans Construction will be according to the requirements of CDOT Specifications Section 609 and Standard Plans, or as otherwise described in Chapter 5 of this document. All curbs, gutters, and crosspans will be constructed of CDOT Class D concrete or an approved equal. All gutters and cross pans shall be 8" thick, minimum. Asphalt curbs are permitted for bridge construction only. All outflow curb and gutter will be CDOT Type 2 —Section IB, unless otherwise approved. All inflow curb and gutter will be CDOT Type 2 —Section IIB, unless otherwise approved. All mountable curb shall be CDOT Type 2 Section IM or Section IIM, unless otherwise approved. All crosspans will be CDOT Gutter Type 2 with a minimum thickness of 6 inches, unless otherwise approved. The minimum vertical slope for all gutters and crosspans will be 0.5 percent. Minimum width of 8 feet. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA FAGE I 143 10.8.4 Concrete Structures, Manholes, and Inlets Construction rill be according to the requirements of CDOT Specifications Section 601 and Standard Plans, or as otherwise described in Chapter 5.6 of this document. All irrigation structures will be reviewed and approved by the applicable irrigation company or board prior to construction. All concrete structures, manholes, and inlets will be constructed with steel reinforcement as shown on the approved construction plans. The contractor will be responsible for concrete quality control testing for all cast -in -place concrete construction. The contractor will request an inspection of the concrete formwork by the inspector a minimum of 24 hours prior to concrete placement. 10.8.5 Retaining Walls and Slope Stabilization Measures Any retaining 'o✓alls 4 feet tall or higher that are to be constructed in the right-of-way will be designed (and designs vAll be stamped) by a Professional Engineer licensed in the state of Colorado. The contractor wil s abmit detailed plans for approval by the department prior to construction. Retaining wall foundations must fol ow the recommendations provided by the geotechnical engineer. Modular block retaining walls will be constructed per the manufacturer's specifications. Retaining walls will be located such t-atthey ensure adequate clear distance from the wall to the edge of the roadway and so do not pose a risk to the traveling public. Any retaining wall constructed in an urban or residential area and greater thi r 4 feet in height will incorporate a railing or fence for fall protection. Non -structure erosion control measures for slopes (blankets, turf reinforcement mats, etc.) will be installed per the manufacturer's specifications. Structural slope stabilization measures (riprap, gabions, soil anchors, slope mattresses, etc.) will be designed, and designs will be stamped, by a Professional Engineer licensed in the state of Colorado. The contractor will submit detailed plans for approval by the department pr or to construction. 10.9 OTHER ROADWAY FEATURES 10.9.1 Paverr.ent Markings All roadways anc bridges constructed will receive permanent pavement markings (striping) prior to the construction traffic control devices being removed. The contractor will ensure that all pavement markings have Jeen designed and located according to the requirements of the MUTCD. All permanent line striping wit be done with epoxy paint materials applied according to the manufacturer - recommended methods at 15 mils minimum thickness, unless otherwise approved by the department. Both pavement and air temperatures will be at least 50 degrees and rising at the time of pavement marking. All pe rmanent words, symbols, stop bars, crosswalks, etc., will be pre -formed thermoplastic pavement markings capable of being affixed to the asphalt pavement surface by heating, unless otherwise apprpved by the department. The minimum pavement and air temperature will be as recommended 37 the manufacturer. The contractor will submit a copy of the manufacturer installation recommendations to the inspector prior to application. 10.9.2 Traffic Control Devices (Signs and Signals) Installation of all permanent traffic control devices within the right-of-way is to be approved and overseen by the department. Traffic control device materials and manufacturers will meet the requirements o''CDOT Specifications Section 713 and the latest version of the MUTCD. Installation of WELD COUNT' ENGINEERING & CONSTRUCTION CRITERIA PAGE 1144 traffic control devices will meet the requirements of CDOT Specifications Section 614 and the latest version of the MUTCD. Construction of traffic signals within the right-of-way with the intention of turning over ownership of the traffic signal to the County will require specific design guidance and approval by the department. 10.9.3 Trees and Plantings Weld County does not encourage the placement of any trees or plantings within the right-of-way that require an irrigation system. Any trees or plantings proposed to be used will be able to survive under non -irrigated conditions. Trees and plantings will be located such that they do not present a safety hazard to the traveling public by ensuring adequate clear zone distance from the trees and plantings to the edge of the roadway. Trees and plantings will be of the species and varieties previously approved for use by the department. The contractor will obtain certificates of inspection of plant materials that are required by federal, state, or local laws, and will submit the certificates to the department for approval prior to planting. All delivered plant materials will be free from plant diseases and insect pests. All plant materials are subject to the two-year warranty period. The contractor is responsible for removing and replacing any dead plant materials that have been identified by the department prior to the end of the warranty period. 10.9.4 Sidewalks and Trails Any permanent sidewalk, bikeway, or trail within the right-of-way will be constructed with concrete or HMA, with a minimum thickness of 4 inches. The minimum width of the completed surface will be 5 feet. All completed surfaces will have a maximum cross slope of 1.8 percent to ensure proper drainage and comply with the Americans with Disabilities Act (ADA). Sidewalks will be constructed with concrete curb ramps and will comply with ADA requirements. Before any surfacing is placed, clearing and grubbing, tree removal, grass and brush removal, and topsoil removal will be completed. The existing ground then will be thoroughly compacted to not less than 90 percent of maximum density as determined by AASHTO T99. Materials testing requirements may be waived by the inspector if the amount of sidewalk being constructed is minimal or the construction methods being used are obviously adequate to ensure required results. 10.9.5 Guardrails All new guardrail placed within the right-of-way will be CDOT Midwest Guardrail System (MGS). Any contractor installing guardrail will be pre -qualified with CDOT for this specific type of construction (work type 14). The contractor will be responsible for providing and maintaining traffic control devices until the guardrail construction has been entirely completed, inspected, and approved for use by the inspector. 10.9.6 Fences New fences constructed within the right-of-way will be in accordance with CDOT Specifications Section 607 and Standard Plans No. M-607-1 (Wire Fences and Gates). In cases where a contractor is replacing an existing fence, the adjacent landowner and the inspector should be consulted regarding acceptable fencing materials. In all cases, the contractor will obtain permission to enter upon adjacent private land. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA G 145 Construction = fences intended to be located on the right-of-way line will be surveyed and staked prior to constructic If the locations of the right-of-way line or adjacent property lines are in question, the department w I be consulted for assistance. All fences will be designed and constructed in a manner that does not adversely impact the sight distance for vehicles, especially near roadway intersections. In urban or de /eloped areas, standard barbed-wire fences are not the preferred type. Developers and landowners earl make use of many other fence types that will better fit the needs. The department will be consultec and will review specific requests prior to construction. The contractor will perform clearing and grubbing as necessary to construct the fence to the required grade and al g tment. At locations where fence posts or anchors need to be imbedded in concrete, adequate bradrg will be left in place until the concrete has hardened. The tops of all posts will be set to the required grade and alignment. Avoid cutting off the tops of treated wooden posts. All gates will be galvanized ste�I or factory -painted, unless otherwise approved. 10.9.7 Cattle Guards In Weld Count,, cattle guards are used to keep cattle or other grazing animals off the right-of-way. New cattle guards crnstructed within the right-of-way will be in accordance with CDOT Specifications Section 611 and Stand rd Plans No. M-611-1 (Cattle Guard). A written agreement similar to the agreement found in Appendix 8-C of the Weld County Code must be received by the Public Works Department prior to installation. The contractor will obtain permission to enter upon adjacent private land, if necessary, for construction and will make arrangements for temporary access with the affected landowner(s). The deck area Dt all cattle guards will be constructed of steel, and all hardware will be galvanized steel. The contractor will ensure that concrete has sufficient time for curing and strength gain prior to allowing traffic to use the new cattle guard. The contractor will be responsible for providing a temporary means of controlling cattle or other grazing animals during construction. WELD COUNT t' ENGINEERING & CONSTRUCTION CRITERIA PAGE 1146 CHAPTER 11 PERMITTING The following permits are issued by the Public Works Department or the Planning and Zoning Department, as indicated. Additional information regarding any of the permits, including application forms, can be found on the Weld County website. 11.1 TRANSPORT PERMIT The Transport Permit is issued by the Public Works Department and is required when vehicles using the County road network are overweight, over -sized, or both. It is issued for standard overweight or over- sized load vehicles and for oil rigs drilling in the County. Permit conditions or restrictions may apply to these vehicles and are listed on the application form. When a permit for this application is issued by Weld County, the permit is subject to the conditions described with the understanding that no liability is assumed by Weld County by reason of its issuance. With regard to the condition of roads or capacity of culverts and bridges, the applicant must examine and inspect the adequacy of roads and bridges for traffic movement. In case of an emergency, an authorized Weld County employee or an authorized agent may suspend the permit until emergency conditions have passed. (See Weld County Code, Chapter 8, Article XV, Sec. 8-15-10, et seq.) 11.2 RIGHT-OF-WAY USE PERMIT The Right -of -Way Use Permit, issued by the Public Works Department, is a tool to help regulate unauthorized obstructions of, excavations in, and use of the County's rights of way and easements by requiring permits for all construction activities within the Weld County rights of way or easement and provide for the subsequent restoration upon completions. A Right -of -Way Use Permit grants a permit holder permission to occupy, excavate, survey, perform locations, or construct facilities within the County rights of way or easements and provide for the subsequent restoration upon completion. (See Weld County Code, Chapter 8, Article XIII, Sec. 8-13-10, et seq.) Right-of-way Use Permit instructions and application can be found at: https://www.weld.gov/Government/Departments/Public-Works/Permits/Right-of-Way-Permits. 11.3 ACCESS PERMIT Land use, natural resources recovery, general utilities, and development have impacts on County roads. The requirement for Access Permits, issued by the Public Works Department, recognizes that the efficiency and safety of County roads depends on minimizing roadside interference and its detrimental effect upon the movement of traffic. The Access Permit sets out minimum requirements for the design, construction, and maintenance of accesses. (See Weld County Code, Chapter 8, Article XIV, Sec. 8-14-10, et seq.) 11.4 GRADING PERMIT The Grading Permit, issued by the Public Works Department, is a tool to ensure that the County has reviewed the grading plan, the erosion and sediment control plan, and the utility map for proposed construction activities with the goal of avoiding potential damages. A Grading Permit grants the Permit Holder permission to conduct construction activities within the requirements of applicable state regulations and provides the County with sufficient oversight to minimize the potential for offsite damages. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 147 A Grading Permit will be required if disturbing more than one acre or any earth disturbance in an MS4 area per the PAS4 criteria within this document. (See Weld County Code, Chapter 8, Article XII, Sec. 8-12- 10, et seq.) 11.5 FLOC DPLAIN DEVELOPMENT PERMIT The Floodplai t Development Permit is issued by the Planning and Zoning Department. (See Weld County Code, Chapte- 23, Article XI, Sec. 23-11-200, et seq.) WELD COUNT! ENGINEERING & CONSTRUCTION CRITERIA PAGE 1148 CHAPTER 12 VARIANCE REQUESTS The County recognizes that in certain limited instances it may be exceptionally difficult to conform to the criteria set forth in this manual and the Weld County Code. The County will consider requests for variances on a case -by -case basis. The variance request will be submitted in a written attachment to the initial submittal of construction plans. Drainage variances are addressed in Section 8-11-160 of the Weld County Code. All other requests will consist of the following: 1. Identification of the criteria or Weld County Code section to be waived or varied 2. Identification of the construction criteria adhered to 3. Justification for the variance, which will demonstrate the following: • Hardship is created if the variance is not approved. The hardship shall be specific to the subject property, rather than general in nature, such as cost, and shall not have been self- imposed by the applicant or their predecessors in title to the property. • There will be only minimal impact on public safety. • The variance is not contrary to best engineering practices. • The variance is not contrary to the intent and general purpose of these criteria and the Weld County Code. • The variance does not result in a significant impact to the public due to maintenance of the improvement. • The variance does not result in a significant impact to the aesthetic appearance of the improvement. • The variance is the minimum exception from the criteria necessary to afford relief from the hardship. • The variance is reasonably necessary for the health, safety, and welfare of the public. The variance request shall be prepared, stamped, signed, and dated by a professional civil engineer licensed to practice in the State of Colorado. Requests will be reviewed by the Public Works and/or Planning Services Director or his/her designee. The Public Works Director, or his or her designee, shall only approve the variance request if the applicant has demonstrated the justification required above. The Public Works and/or Planning Services Director or his/her designee reserves the right to deny, or allow his or her designee to deny, any request for variance if doing so is in the interest of public health, safety, and welfare. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA t' A i, c 1149 This page intentionally left blank. WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 150 APPENDIX A - Weld County Drainage Basin Map WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA t • 1H R t%N ROT, ROOW 13 if. 17 19 21 23 25 27 29 54 52 3 5 7 Y50 It 411 46 1• YJ 28 26 24 16 14 12 111 4 2 3 5 11 rat, i7 13 IS n6an It 19 Al 23 23 17 29 mow R 051Y lr 45 ;;;:41•5 H 63W C c:n1 RONI Sorbet?) Lkaw R61W 91 Kiowa Creek 91 Rent R !OW Two 6{;1. Mourn+4n South Pawns* Creek Wildcat Creek T NI tw •i4 6I 110 58 sa 54 52 SO 48 48 44 T 474 42 40 38 30 34 94 30 28 26 24 22 4d 16 14 1 12N R 59W S.drny Draw R 5;IN R SOW * . • i•••r•t• • • R S7W t Sr.1 Weld County Drainage Basin Map Legend t..•4 I_.4.rlr . ... /4e'Iw1/. I....c 0 Drainage Basin Boundaries — R t n,v.y., ... Ikon' 1.•ua. Ir N V•.. ,_ .• t. 11n• C.... C.Kia V 3u...II. 9.n. Gawp L. -we day Croak Ch I Rayaa Ca1W.w4oa r,•..• t sin CIrt• OvessaoO Draw Wawa Ctn. I as Tl.. c•�4 Lois PSETI Pans.. t n.M U -AN 1. rat Satin On. 5 alot Ots. South Ps •••••• uu.a Se" 1440. R.rl. S✓ na Cw•;+..... G..t tat. 144. Ma r..t 1 alccal G«. MapProuu1.rd 5, A'ek1 County Pubic Works February 2010 fis COLORADO 4 ®.9 2 3 4 5 • Miles Mann mon Ban sews non r.•t M .l.. Ion IV Saar as .....r ern I....a.• MI Mein nee.. , • �...... «. f .e se mem.0. ..all as .S. IL, UlK nee +. I • get.. /.n... + .�.....�..s.«Iu.(..Ia.au .a ass ....i0951 a. Yoe erne VS.'. Set aar.+. Tien wten an..rsu.v•r.. ,_, . .......e.y..•. —r_. V..1...1...••••I. - no .....r. en wr aqn• 11 I IL I M 114 00 00 82 80 to ib 14 1 1;1. ;I% 7 46 Ni APPENDIX B - Drainage Report Checklist WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Drainage Report Checklist Project Name: The purpose of this checklist is to assist the applicant's Engineer with developing a drainage report that supports the intent of the Weld County Code using commonly accepted engineering practices and methodologies. Is the project in the MS4? Yes 11 No If yes, the following requirements in blue apply. See Chapter 8, Article IX of the Weld County Code. Report Content Weld County Case Number Certificate of Compliance signed and stamped by a Colorado Licensed PE Description/Scope of Work Location (County Roads, S -T -R) Nearby water features and ownership Total acres vs. developed acres Hydrological soil types/maps FEMA Flood Zones Urbanizing or non -urbanizing Methodologies used for report & analysis (full spectrum is not accepted) Base Design Standard used for permanent control measure design in the MS4 Discussion of offsite drainage routing Conclusion statement indicating that the design will adequately protect public health, safety, and general welfare and have no adverse impacts on public rights -of -way or offsite properties Hydrology and Hydraulic Analysis Design Storm / Rainfall Information (NOAA Atlas or Local Data) Release Rate calculations Li Post construction site imperviousness Hydrologic calculations (historic & developed basins) Hydraulic calculations for proposed drainage improvements (swales, culverts, riprap, pond, outlet, spillway, WQCV outlet etc.) El Detention/WQCV calculations Comments: Construction Drawings Stamped by PE Engineering scale & north arrow Property lines, rights -of -way, and easements 1' Contours & elevations (existing & proposed) Pre- and post -development drainage basins Arrows depicting flow direction Time of concentration critical path Drainage design points Improvements labeled Permanent control measure and associated drainage features labeled 'No Build/No Storage', include design volume Cross sections for open channels, profiles for pipes Elevations for inverts, flow lines, top of grates, orifice(s), etc. Pipe specs (size, material, length, slope) Pl Outlet and spillway details Maintenance Plan Frequency of onsite inspections Repairs, if needed Cleaning of sediment and debris Vegetation maintenance Manufacturer maintenance specifications, if applicable Other Required Documents (If Applicable) Variance Request and documentation— explain hardship, applicable code section, and proposed mitigation. Variances will not be granted for the Base Design Standard requirement in the MS4. Department of Planning and Zoning I Development Review 11402 N. 17th Avenue, Greeley, CO 80632 1 Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Develo pment-Review 3/13/2023 Drainage Report Checklist 1 2. Once the revised design and drainage report have been submitted, the County may provide additional comments in addition to the ones listed above. Depending on the complexity of the changes made, a full 28 -day review period maybe required. 3. Please provide 3 written response on how the above comments have been addressed when resubmitting the drainage report. Thank -you. Department of Planning and Zoning Development Review 11402 N. 17th Avenue, Greeley. CO 80632 Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Develo pment-Review 3/13/2023 APPENDIX C - CDOT Operations and Maintenance Plan Guidelines WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA COLORADO Department of Transportation Preparation Guidelines for Operations and Maintenance Plans (O&M Plans) for Permanent Water Quality Control Measures (PWQ CMs) This document will guide CDOT staff and consultants, including Design Engineers, Project Engineers, Hydraulic Engineers, and Environmental and Maintenance staff, in the development of an Operations and Maintenance Plan (O&M Plan) for Permanent Water Quality Control Measures (PWQ CM) installed during a project's active construction phase for long-term treatment of runoff from the project area after construction is complete. PWQ CMs include extended detention basins, sand filters, media filter drains, and other constructed and proprietary structures.' The CDOT Drainage Design Manual and Maintenance Manual provide additional general direction on the design and maintenance of PWQ CMs. The development of an O&M Plan for each PWQ CM needs to occur for compliance with the requirements of the Municipal Separate Storm Sewer System (MS4) Permit issued by the Colorado Department of Public Health and Environment (CDPHE), specifically Part I.E.2.v. E.2.v. The O&M Plan is intended to serve as a reference document for maintenance staff to review prior to leaving the maintenance yard so that they arrive at each PWQ CM site with the staff and equipment required to maintain the PWQ CM, an understanding of access requirements and maintenance expectations, and a knowledge of necessary procedures required to maintain the PWQ CM to its original design specifications. The O&M Plan will reflect as -built conditions. An example O&M Plan has been provided. The example OEtM Plan is representative only. The information and text included in the example OEtM Plan are not reflective of what should or should not be done at any site; it is reflective only of the type of information that should be provided. All O&M Plans for PWQ CMs shall generally conform to the example regarding the type of information provided; however, not all necessary contents may be included on the example O&M Plan. Unique features may warrant inclusion of additional information. This guidance document provides a thorough discussion of the elements that will be required, if applicable, on an OEtM Plan for PWQ CMs. The O&M Plan will be a doubled -sided 11x17 with a font size of at least 11 point. If an item is not required, note that is it not required rather than omitting it from the O&M Plan. No. Front of 11x17 Sheet 1. Title block and title text Colorado CM Maintenance O&M (one is treating, of Plan shall seven county and Section SAP the include the PWQ CM month or a CM is in, Local title categories), the and Agency block CDOT year and the responsible Region the title facility SAP the text for that number, CM was maintenance. is constructed. includes the in, the the project route It facility and will also The name, subaccount route include front the segment the and type number, CDOT back the of Region of PWQ PWQ each CM the 2. Location map find the of map shall PMQ PWQ CM. CM. cover The Scale enough location shall be area map shall between and include show 1"=1000` CDOT enough and roadway(s) 1"=5000'. major roadways with mileposts, that the OhM north A Plan arrow, large-scale user can and location location 3. Detailed as -built plan view turn-arounds, undisturbed etc. view areas; features at Scale to Detailed structure Include of the be the elevation; and shall delineated site, by areas shall PWQ the instructions and be if it maintenance 100 it sediment/debris to be shall between CM right-of-way, is be identified -year by below location be dimensions mowed shown need floodplain 1"=20' grade activities shall such not or property in and or show stockpile to the be from receive as if 1"=100'. otherwise provided such forebays, applicable. detailed all roadway boundaries, nearby areas; as other The areas plan on may micropools, If the location centerline, roadways; at regulated weed a view. be least ownership, power detailed difficult control of one inlets, Any source the edge all by plan to hard a activities weight access and 404 of find. outlets, usable view - For if A smaller maintenance maintenance easements; permit including structures, by restricted they point pavement, included the scale any weed trickle areas or access control areas PWQ detailed other spraying. other staff shall to channels, in CM sensitive hard, points, point remain is be the may present plan shown. notes. including Major need visible maintenance are or to ' Refer to the PWQ Section of the Drainage Design Manual for more information (https://www.codot.gov/programs/environmental/water-quality/documents/drainage-design-manual-1). Version 1 _May 2019 Page 1 of 4 C0COLORADO r 0 Department of Transportation exam in the- ale, if vicinity, the it PWQ will CM is a be necessary below -grade to indicate vault which with manhole specific access, manhole(s) and there access are the multiple PWQ CM. manholes 4. Profile and design required view, and culverts, shall notes elevations a information. storm profile show on for the event. the every view permanent used Such extents back PWQ of such General of the information CM, and pool the main as if depth the maintenance O&M critical elevations, flow elevation Plan. of path may the information include crossing notes through filter of the media, may variations utilities, water the cannot PWQ and quality be included be flow CM in underdrains sufficiently slope capture may direction, on of the be the added and volume profile in main and sections other to show channel any (WQCV) or structures. design reserved and/or critical invert or any for the eleva or The water spec-ic the While pices p not an ions profile surface detailed 5. Sections PWQ elevations trickle of the with limitations. proprietary CM grates, sections the channels, sections of all screens, as access structures applicable. road shall CM storm components be gates, surfacing sewers, included may trash A including, underdrains, be section material to as racks, detail provided showing and and all but tops sumps, filter by the thickness, not the limited maintenance of media walls, headwalls, manufacturer. minimum dimensions to, inverts, forebays, wingwalls, access width, rims, Nearby and roads inlets, maximum dimensions, overflow specifications. utilities shall micropools, also grade, shall weirs, be and be and Enough flowlie outle orifice Sections shown incluc any plates, :s, in ed v -eight 6. Grate Details grates are stolen. must be This included includes with exterior enough information dimensions, that materials, the maintaining and agency bar spacing in can both reorder Detai grates direc s of if they all ions. 7. Front page notes of the notes on conditions. OEtM may critical be Plan These added items is notes generally such here as as may reserved well how also as to be on handle included for the plans, second wetlands on sections, the page or of weeds back profiles, the page O&M on site, to and Plan. provide unique details, These any may access While notes inc.uc instrLctions, redur e the of high detailed first importance or page IGA dancy. No. Back jf 11x17 Sheet 1. Note on general project information number, phone address, Engineer number; and number, agency, for phone the contact the name(s) design and number, name of email contact of of PE the address the the email license receiving PWQ Maintenance if address number, CM; available; water; the if Section the property the available; and contact name, maintaining owner's the email The phorr' name�s), agency's desig address Superintendent rotes number, engineer's if shall contact name(s), available. include email shall name, contact name(s), of If be CDOT the the address, included. name, contact project CDOT is the phone address, subaccount Project name, maintaining 1 2. Note on the general facility description the description the If and etc.); facility project CDOT flows location and a that Maintenance will note are the under bypassed of not should includes origin the treat which bypass be of Section prior what the the the added 100 structure. runoff PWQ to type and -year on reaching CM of it Local how storm PWQ treats, was those the constructed, Agency CM including event PWQ flows the (if CM, facility but are will a if safely note is; shall The how tribe- appli appli recei conveyed rotes c functions inflow included shall area. through should that include A exceeding (filtration, approved brief and that be included a note beyond details general the its sedimentation, about volumetric the the as design. facility well function the facility. overall as If capacity, ary :able, :able) 'e De 3. Note on the anticipated inspection and maintenance frequency and procedure Version 1_May 2019 Page 2 of 4 0 COLORADO Department of Transportation Initial hour. be annually during inspected inlets, interior The Traffic that including and any maintenance control adjusted maintenance a other materials PWQ at the access dewatering a of control at longest minimum, first include structure, sensitive CM a based considerations inspection reach such with findings and storm canal confined requirements distance as Maintenance forebays, any is stop shalt an gate any sewer shall not such inspection requirements space of other logs, be inspections (to required; from low include as annually outfalls, if be restoring or entry maintenance frequency water access sediment additional form exercised), the protocols; sediment issued incoming plus during crossings, road; filled following flow after may must cleanup out the by restrictor and mowing required patterns, be the and storms dewatering be for riprap first increased at debris EPA outgoing tested each a and requirements. maintenance producing year. or side plate, minimum, removing removal weed inspection. CDPHE. and for slopes PWQ based pipes, contaminants micropool, water control; provided temporary CM and more on Examples and pond activities; Inspection maintenance findings control disposal inverts, information than outlet trash they of prior dewatering 1 items inch of items rack, requirements requirements, grouted structure are frequency inspections to of shall applicable: to on disposal; to well rainfall be riprap, wetlands and be be including screen. replaced; such may water per post - minimum. year ramps, plan; testing pond procedure permit on areas; measures 4. Notes on required maintenance equipment, materials, staffing, and responsibility be required), to C.R.S. subject required that be party operate hoses, shall required of need (IGAs) does 43-2-135 to to vac inflatable be quantities. the included. to a trucks to pump not be as or The maintain (note coffer Materials ordered Staffing complete install These regarding maintenance. agreement fulfill the maintenance notes reach dams, a notes its the in notes the coffer contractual shall may advance maintenance required), and PWQ weed shall include shall maintenance The include dam, a include general mechanism. CM. IGA killer, include or this obligations. proprietary more description all Equipment air of should a summary equipment, compressors, generators, the general the activities. description PWQ minimum be Also may replacement noted CM and of filter and For the note include, and and details materials, shovels, number in agreement, sprayers. media. example, details which if this should CDOT but products buckets, section. and Materials of if of entity not Anticipated or maintenance include labor two any including a be is Local such inter excavators employees that limited notes responsible as the Agency is sizes -governmental what filter should dates anticipated to staff mowers, (note of are happens is bags for expected and relying all include reach required which equipment or parties agreements if to pumps, media approximate to aspects one on 5. Notes on ROW, adjacent ownership, and access the dimensions right-of-way Notes drive locked from shall of gates the maintenance shown also south). might include in the detailed access. be encountered, additional These plan applicable notes locations view, shall the of The adjacent include keys, specific notes access property instructions property shall codes, include access ownership, and (e.g., a requirements vehicular general must and approach description locations such weight of and as whether limitations. access 6. Notes on vegetation management live notes have XXXX.XX, total other mowing, seed methods, and area shall been (e.g. vegetation. maintenance per on include to and planted acre the mowing, and be weed low mowed, these of all at each flow spraying, control. seed the procedure in shall type channel site. acres, There mixes of etc.) be Seed noted. and (dryland/upland seed side and shall may frequency. mixes slopes, that any These be be shall notes included some was notes etc.). include planted These on redundancy and/or shall mowing. in notes the all as also wetland genus, well notes. include are with as intended The the mixes) species, the These How Different criteria location notes notes weed and notes on variety, on to areas are control replacement the be any (e.g. shall specific anticipated more trees and may above also is to require to detailed. or pounds indicate shrubs be of seed elevation accomplished seed different inspection pure mixes, The that the or Version 1_May 2019 Page 3 of 4 COLORADO Department of Transportation 7. Notes on hydraulic design noted flow associated elevation, sumps. the rates at if volumes applicable. a Depths used minimum. water if applicable, in of of the surface major major The hydraulic elevation, the structures notes structures design 100 shall -year the shall that include including excess volume can be other urban accumulate noted. base and The flow calculated runoff associated WQCV and volume sediment the drain flow water 2- (EURV) including time and rates surface 100 - as and and The year applicable, assoc elevation foreba/s, EURV notes Deak ated drain shall inflow if micropools, the water time applicable, include WQCV shall surface and all outflow and and be and 8. Notes on sensitive areas, wetlands, and permits wells, site, or other permit permits. stormwater The any and environmental notes hazardous any if sensitive The the known shall notes CM discharge, is areas, include materials unmitigated within shall permit wetlands any also the groundwater, that and include 100 monitoring hazards. how were -year to remain maintenance information or floodplain etc. or could Permits that on The undis:urbed, activities inspections any reasonably may anc ca C0PHE notes be -rent required shall are and required or be permits different retired anticipated include areas include such by descriptions covered for groundwater 404 a as to these floodplain or construction be other by encountered a areas, of 404 environmental monitoring development any if dewatering, permit applicable. environmentally on 9. Notes on snow and ice control of requirements and/or locations roadways where for maintenance within snow and the ice staff PWQ control CM are responsible and exist, the they methods are for likely snow by which a and Local ice snow Notes cortn. and Agency shall ice if are requirement. include necessary to be descriptions controlled. for sidewalks If 10. Notes on miscellaneous information or details or and for vertical that general datum, are informational important and coordinate for understanding purposes. system One required information. the inspection and item is the Notes maintenance apprcximate shall include requirements survey any date, other of horizontal items the site 11. Notes on homeless encampments should template the be the local shall Maintenance agency be included to determine Section on all OEM Superintendent. who should Plans. be The contact For contacted. PWQ person CMs for The all ma-ntained note included PWQ CMs by maintained a on local the agency, OEM by CDOT Plan contact Version 1_May 2319 Page 4 of 4 APPENDIX D - As -Built Drawing Checklist WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA As -Built Drawing Requirements As -built drawings are required for all projects within, or draining to, the MS4 area or when requested by Development Review for sites outside of the MS4 area. While it is expected that a project will be built in accordance with the accepted construction plans, it is understood that unforeseen site conditions may require deviations. Therefore, as -built drawings are required to be submitted for all site drainage and shall clearly demonstrate the construction of drainage features as designed and in accordance with Weld County Code. As -built drawings shall verify critical public safety elements and document all modifications/changes to the original plans as described below. As -built drawings are typically a red -lined copy of the original, accepted grading plans, unless otherwise allowed by Public Works. As -Built Drawing Requirements: ✓ Surveyor's and Engineer's Statements of Substantial Compliance are required on the cover sheet only and as follows: • Registered Colorado Professional Land Surveyor: A registered land surveyor in the State of Colorado shall certify the construction of drainage and stormwater infrastructure with the following statement: "A field survey was conducted by (Surveyor), on (Dates). Unless explicitly marked, constructed condition should not be assumed. I, (Surveyor), hereby state that in my professional opinion the information shown on these plans accurately represents the improvements constructed. • Registered Colorado Professional Engineer: The responsible P.E. for the project shall certify the construction of drainage and stormwater infrastructure with the following statement: "Based upon review of and reliance on the field survey data and other pertinent data provided by (Name of Firm(s) or Surveyor), on (Date), and a final site investigation conducted on (Date), I hereby state that to the best of my knowledge, information and belief, it is my professional opinion that the facilities shown in these drawings were constructed in substantial compliance with the accepted Drainage Report and/or Construction Drawings and the Engineer's intent. This statement is based only on a review of the field survey data and a final site investigation." The As -Built drawings are a standalone document and shall provide an exact rendering of the construction as it appears in the field. Any modifications to the original plans, whether minor or major, shall be included. The changes shall be color coded, bubbled, clouded, or outlined and they shall be explained clearly in writing. Any deviation from the plans shall be specified, whether the change was in design, location, or the materials used. Small details like materials used shall be documented if they differ from those indicated in the original plans. The intended but unused materials shall be crossed out to acknowledge the changes that emerged during the construction process. If necessary, additional sheets may be added to clearly show all required information. The verification of public safety elements (i.e., detention/retention pond volume, stormwater conveyance structure capacity, etc.) shall be based on a field survey prepared by a Colorado licensed surveyor. • As -Built Drawings for Storm Sewer shall verify the material, size and longitudinal grade of all storm sewer pipes and culverts. Elevations are required for all pipes, inlets, riprap, headwalls, and all other storm drainage infrastructure shown on the accepted plans. • As -Built Drawings for Open Channels shall verify all drainageway grades/slopes, channel cross -sections and horizontal and vertical information for all grade control structures. • As -Built Drawings for Detention / Water Quality Facilities shall verify horizontal/vertical information of all facilities including pipe or channel inlets, low flow or trickle channels, outlet structures, emergency overflow spillways, and water surface elevations (WQCV and 100-yr storm event). Provide spot elevations for critical stormwater infrastructure locations (spillways top of ponds, outlet structures, etc.). A stage/storage table of the surveyed pond may be required if topography (1' contours) significantly differs from the original plans. Department of Planning and Zoning I Development Review 1 1402 N. 17th Avenue. Greeley. CO 80632 1 Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Development-Review APPENDIX E - USDCM 2007 Runoff Coefficients WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA cowoocn�-�il,cncnocn 0 O"1 0 0 0 %0L %99 55% 60% ocn 0 0 35% 40% 25% 30% 15% 20% o oo 0 ocC°i,oc°°i, 0 0 0 0 75% 80% %0L %99 55% 60% 45% 50% 35% 40% 25% 30% 15% 20% acno Percentage Imperviousness 0% 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TYPE B NRCS HYDROLOGIC SOILS GROUP 0.02 I 0.08 I 0.15 I 0.25 I 0.30 I 0.35 O O O O O O O O O O O O O O O O O O O O O N O0 V CO CO V O + W Cn CT V � A It CJ1 � W W V W N N CC) O N N W O 8 O CJ7 R> 0 N OD 0 0 O � C� O 8 8 V O W O O U, O � t t O CJ, � V `4%."`-'2 W W � --• N N OD CJ, N O -1 4 V �A a' 0 � O 0`g � � Type C and D NRCS Hydrologic Soil Groups O O CD OD O O O V O W CA O O U, U, O H O O ? A O Cn O O A W O O O W W CT N O O W N O V O O N U, O O N' O V O O -+ -a .A O 0 CO OD 'Dc O N 0 0 V O CJ, O 0 0 O C7' W O 0 0 Ut W cfl 0 0 ? O) W 0 0 E- W O V 0 0 W W Cn W 0 0 W N O O 0 0 N N C� � 0 0 N O 0 Cn � 0 0 O W N W 0 0 V CA U7 (O 0 0 CA CJ, W O 0 0 g A W CO 0 0 .P CA W 0 0 A W O O 0 0 W W CA A 0 W W N O ;3) 0 0 N N V U, 0 0 N 78 N CO 0 0 Cfl OD N� 0 0 V V 0 0 O Cn O N 0 0 CT CJ, V .A 0 0 CJt A OD 0 0 A A CA l� 0 0 A A N O 0 0 W; O O 0 0 W W .A N 0 0 W N O O N CJ, ,,f 0 0 ; QD � U1 0 0 V O N 0 0 i P CA N 0 0 U7 U, OD � 0 0 U, Z O 0 0 .: CA � 0 0 7 :P N 0 '4," W W O V 0 0 W W CJ, W 0 W N H O O ;1) ; O .A V O O O0 V O CJ, O O V O O CA O O O CJ, N CO O O Cn U, V U, O O U, U1 W O O U, A O OD O O V O O O .P Z A W O O W Cfl O N W � 0 0 COpoO CJ1 V 0 0 V O W 0 0 iOOU7U,U,.P O� 0 0 O V�� 0 0 0 0 AP,AA. CO O 0 0 CA 1� 0 0 W -� 0 0 GJ O OD 0 0 W W CA W 0 0 COO;cc.:* CT O 0 .V V 0 0 V OCACAOCTUtC.7,CJ,CnCTCnU,AA�?O N O 0 0 Cn N 0 0 O 0o 0 0 V C7, 0 0 �. W 0 0 N 0 l'' O CC) 0 0 V CA 0 ?� O 8 OO�CTOON(DO�.N�OO QC, V V O CA O 8 O O Cn 8 t? t V O�NO0D A A n W Cfl O CAO E W V V ��OCJ, O O O Cn W NOO0D 8 CJ, U, CJ, V CJ, C1, V OU,� U, t Cn Cn W NOS p CJ, O `s;ualaljjeo3 jjoun�l --g-ob algel � 6 'A) ivnNvini VIb0iI0 3 SGVNI`d2IG 0 0 8, o , o 35% i'0% .. %0S %5t %01 %5E 25% 30% 0 0 5% 10% i m o 3 cna� co m m O O O O O O O O O O O O O O O O O O O O O N OD V CO 0Dtp� O al A 512V A W N V 'ea W CflUtNCOO N N� � E.',88 O N O O O O O� O-; Type A NRCS Hydrologic Soils Group 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (n 8 8 O O� V O W U1 U1 O O r A U1 � W .:31 W W N O V N N CJi N 8 8 CO O W' 8 W O O O O N O', O, 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 N N Cie,2 V O W O 8 U1 O �A A .A CO Ul A W � W W W U7 W W N O OD N N CJ1 W N O ;1 r. 8 r. O O 1 CJl � O O TT. 00 . 72 O O V O O CO O O O U1 W V O O U1 ?-8 W CO O O U1 N O O -8 W O V O O W W lJi W O O W N --• (D O O N N O W O O N 8 O O O bi N, 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 U7 C11 8 8 V V V O O S' A CO T. 2 T. t� V U7 .P -8 N O W W O O� W W N W N O V� N N O 8 O.i O O O O O O O O O O O O O O O O O O O O O p CO OD O O V ;l CO N .g O O � to Cn O W O A O V .; A V1 W *It W -� CO W W CJ1 4J 8 W O N N '8,Q: OD � O.C Q TABLE RO-5 (Continued) -Runoff Coefficients, C 4 'A) ivnNwq 3OVNIVHCI APPENDIX F - Rational Formula -Based Modified FAA Procedure WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA STORAGE DRAINAGE CRITERIA MANUAL (V. 2) 3.2.3 Rational Formula -Based Modified FAA Procedure The Rational Formula -based Federal Aviation Administration (FAA) (1966) detention sizing method (sometimes referred to as the "FAA Procedure"), as modified by Guo (1999a), provides a reasonable estimate of storage volume requirements for on -site detention facilities. Again, this method provides sizing for one level of peak control only and not for multi -stage control facilities. The input required for this Rational Formula -based FAA volume calculation procedure includes: A = the area of the catchment tributary to the storage facility (acres) C = the runoff coefficient Q , = the calculated 5 -year or 10 -year historic runoff release rate from pond (cfs) T,= the time of concentration for the tributary catchment (see the RUNOFF chapter) (minutes) P, = the 1 -hour design rainfall depth (inches) at the site taken from the NOAA Atlas website using a site specific gage, for the relevant return frequency storms The calculations are best set up in a tabular (spreadsheet) form with each 5 -minute increment in duration being entered in rows and the following variables being entered, or calculated, in each column: 1. Storm Duration Time, T (minutes), up to 180 minutes. 2. Rainfall Intensity, / (inches per hour), calculated using Equation RA -3 from the RAINFALL chapter. 3. Inflow volume, V, (cubic feet), calculated as the cumulative volume at the given storm duration using the equation: V; = CIA (60O (SO -6) 4. Outflow adjustment factor m (Guo 1999a): m=��1+ Tc 0.5≤m≤1and T≥TT (SO -7) 5. The calculated average outflow rate, Qa„ (cfs), over the duration T: Qav = mQpo (SO -8) SO -10 12/2011 Urban Drainage and Flood Control District DRAINAGE CRITERIA MANUAL (V. 2) STORAGE 6. The calculated outflow volume, Vo, (cubic feet), during the given duration and the adjustment facto- at that duration calculated using the equation: lr'a = Qav (60T) 7. The required storage volume, VS (cubic feet), calculated using the equation: S=V—Vo (SO -9) (SO -10) The value of Vs increases with time, reaches a maximum value, and then starts to decrease. The maximum va ue of VS is the required storage volume for the detention facility. Sample calculations using this procedure are presented in Design Example 6.2. The modified FAA Worksheet of the UD- Detention Spreadsheet performs these calculations (download from Weld County website). 12/2011 Urban Drainage and Flood Control District SO -11 DRAINAGE CRITERIA MANUAL (V. 2) STORAGE 6.0 DESIGN EXAMPLES 6.2 Example -Rational Method Analysis Use the FAA method to determine the required detention volume for the 100 -year storm event for a 15 - acre site that will have a developed percentage imperviousness of 45%. The NRCS soil survey shows the site has hydrologic soil group B soils. The allowable release rate from the basin has to be limited to the 10 -year historic runoff value for the basin (based on a 2% imperviousness value). The time of concentration has been calculated at 12 minutes. The 100 -year, 1 -hour point precipitation is 2.6 inches. A runoff coefficient, C, of 0.51 is determined using Table RO-5 of the RUNOFF chapter (the 45% row and 100 -year storm column of the type B soils table equals 0.51). The calculations are shown in spreadsheet form UD-Detention workbook in Table SO -2. 12/2011 Urban Drainage and Flood Control District SO -39 STORAGE DRAINAGE CRITERIA MANUAL (V. 2) Determination of Detention Volume Using Modified FAA Method Rainfall durations must be entered in an increasing order. Rainfall Duration minutes (irput) Rainfall Intensity inchlhr (output) Inflow Volume cubic feet (output) Adjustment Factor (output' Average Outflow cfs (output) Outflow Volume cubic feet (output) Storage Volume cubic feet (output) O00 12.02 0 O00 8.72 20,021 1.00 12.75 3,825 16,196 1100 6.95 31,902 1.00 12.75 7,650 24,252 15.00 5.83 40,119 0.90 11.48 10,328 29,791 2100 5.05 46,316 0.80 10.20 12,240 34,076 23.00 4.47 51,257 0.74 9.44 14,153 37,105 3=7.00 4.02 55,351 0.70 8.93 16,065 39,286 3100 3.66 58,838 0.67 8.56 17,978 40,861 4100 3.37 61,873 0.65 8.29 19,890 41,983 43.00 3.13 64,559 0.63 8.08 21,803 42,757 54.00 2.92 66,967 0.62 7.91 23,715 43,252 55.00 2.74 69,150 0.61 7.77 25,628 43,522 60.00 2.58 71,147 0.60 7.65 27,540 43,607 65.00 2.45 72,987 0.59 7.55 29,453 43,535 73.00 2.32 74,694 0.59 7.47 31,365 43,329 73.00 2.22 76,287 0.58 7.40 33,278 43,010 8D.00 2.12 77,780 0.58 7.33 35,190 42,590 £5.00 2.03 79,186 0.57 7.28 37,103 42,083 9D.00 1.95 80,514 0.57 7.23 39,015 41,499 95.00 1.88 81,774 0.56 7.18 40,928 40,846 1®0.00 1.81 82,972 0.56 7.14 42,840 40,132 105.00 1.75 84,114 0.56 7.10 44,753 39,362 1-0.00 1.69 85,206 0.55 7.07 46,665 38,541 1-5.00 1.63 86,252 0.55 7.04 48,578 37,675 120.00 1.58 87,256 0.55 7.01 50,490 36,766 125.00 1.54 88,222 0.55 6.99 52,403 35,820 130.00 1.49 89,152 0.55 6.96 54,315 34,837 135.00 1.45 90,050 0.54 6.94 56,228 33,823 1.0.00 1.41 90,917 0.54 6.92 58,140 32,777 145.00 1.38 91,757 0.54 6.90 60,053 31,704 150.00 1.34 92,569 0.54 6.89 61,965 30,604 155.00 1.31 93,358 0.54 6.87 63,878 29,480 160.00 1.28 94,123 0.54 6.85 65,790 28,333 165.00 1.25 94,867 0.54 6.84 67,703 27,164 1'0.00 1.23 95,590 0.54 6.83 69,615 25,975 1'5.00 1.20 96,295 0.53 6.81 71,528 24,767 130.00 1.17 96,981 0.53 6.80 73,440 23,541 Stormwater Detention Volume (Cubic Feet) = The required storage volume is 43,607 cubic feet (approx. 1.0 acre-foot). SO -40 43,607 12/2011 Urban Drainage and Flood Control District APPENDIX G - Grading Permit Checklist WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Grading Permit Checklist Project Name: The purpose of this checklist is to assist the applicant's Engineer in developing a plan to prevent offsite discharge of sediment during active construction and to support the intent of the Weld County Code. Is the project in the MS4? Yes _ No If yes, the following requirements in blue apply. See Chapter 8, Article IX of the Weld County Code. Grading Permit Requirements Weld County Grading Permit Application Grading & Drainage Plan Sediment & Erosion Control Plan Utility Map (per SUE/811 Law Level B, SB18-167) General Requirements for Plans The following items are required both the Grading Plan and Sediment & Erosion Control Plan: 11 Scanned electronic (pdf) or 11" x 17" hard copy !_1 Signed and stamped by Colorado PE Engineering scale & north arrow Weld County case number, if applicable Property lines, rights -of -way and easements Limits of disturbance (include acreage) and temporary construction easements/agreements, if applicable Grading Plans The following items are required for Grading Plans in addition to the general requirements above: Existing and Proposed Grading (1' annotated contours) I J Arrows depicting flow direction and grade flow ❑ Locations and design details for proposed drainage improvements (pond, culverts, swales, spillway, trickle channel, outlet, etc.) — Include finish grade, flowline, invert and crown elevations as applicable. Onsite or adjacent springs, streams, wetlands and/or other surface waters, including irrigation ditches Vicinity Map with the drainage route to the nearest receiving water Notes on the major phases of construction Final stabilization (pavement, gravel, >70% vegetative growth, etc.) Sediment & Erosion Control Plans The following items are required for Sediment & Erosion Control Plans in addition to the general requirements above ■ Provide an Interim Construction Plans and Final Construction Plans clearly depicting, describing and locating all temporary control measures to be implemented. Include installation and implementation specifications (BMP details) for structural control measures (silt fence, straw wattles, vehicle tracking control, etc.), including maintenance and removal notes. Provide a narrative description of non-structural control measures (preservation of vegetation, traffic control, surface roughening, street sweeping, etc.). I Clearly depict, describe and locate all permanent stabilization methods to be implemented. FT Include installation and implementation specifications for final stabilization methods (seed, crimped mulch, soil amendment, soil retention blanket, turf reinforcement mat, etc.). Other Required Documents (If Applicable) MS4 Pollution Prevention Plan Checklist for sites located within the MS4 area Weld County Access Permit Weld County Right -of -Way Permit Weld County Early Release Request for Grading Permits (Land Use cases must be conditionally approved by BOCC, Planning Director or designee.) CDPS Permit for Construction Stormwater Discharges (COR400000) CDPS Permit for Construction Dewatering Discharges (COG070000) USACE Section 404 Permit for Dredge/Fill in WOTUS Department of Planning and Zoning I Development Review11402 1402 N. 17t' Avenue. Greeley. CO 80632 I Ph: 970-400-6100 www.weld.gov/Government/Departments/Planning-and-Zoning/Development-Review 1. 2. Once the revised Grading Plan and/or Sediment & Erosion Control Plan (with responses) have been submitted, the County may provide additional comments. 3. Please provide a written response on how the above comments have been addressed when resubmitting. Thank -you. Department of Planning and Zoning I Development Review11555 1555 N. 17t" Avenue, Greeley, CO 80631 Ph: 970-400-6100 www.weldgov.com/Government/Departments,Planning-and-Zoning/Development-Review 3/13/2023 APPENDIX H - MS4 Pollution Prevention Plan Checklist and Manual WELD COUNT? ENGINEERING & CONSTRUCTION CRITERIA MS4 Pollution Prevention Plan Checklist Site Name or Case No: Complete the table below and submit with the Grading Permit application. At a minimum, items in red are required to be included in the Grading Plans or Sediment & Erosion Control Plans. Mark other applicable items with a check mark. Items not listed below may be added to "Other Control Measures", which will be reviewed and accepted on a case -by -case basis. Temporary Control Measures If applicable to the i site If applicable to the site, include the following: (Pages Narratives located in Part I) Details (Pages located in Part II) Sediment and Erosion Control Measures: SC -1: Silt Fence (SF) ✓ SF -1 to SF -2 SF -3 to SF -4 SC -2: Sediment Control Log (SCL) J SCL-1 to SCL-2 SCL-3 to SCL-5 SC -3: Straw Bale Barrier (SBB) SBB-1 SBB-2 to SBB-3 SC -5: Rock Sock (RS) , RS -1 RS -2 to RS -3 SC -6: Inlet Protection (IP) IP-1 to IP-3 IP-4 to IP-8 EC -8: Temporary Outlet Protection (TOP) TOP -1 TOP -2 to TOP3 EC -12: Check Dams (CD) CD -1 to CD -2 CD -3 to CD -6 Materials and Site Management: MM -1: Concrete Washout Area (CWA) ./ CWA-1 to CWA-2 CWA-3 to CWA-4 MM -2: Stockpile Management (SP) J SP -1 to SP -2 SP -3 to SP -6 MM -3: Good Housekeeping Practices (GH) I GH-1 to GH-6 N/A SM-4: Vehicle Tracking Control (VTC) I VTC-1 to VTC-2 to VTC-3 VTC-6 SM-6: Stabilized Staging Area (SSA) I SSA -1 to SSA -2 SSA -3 to SSA -4 SM-7: Street Sweeping and Vacuuming (SS) 1 SS -1 N/A SM-9: If statement no dewatering Dewatering Operations (DW) is anticipated, in the notes. include a DW-1 to DW-2 DW-3 to DW-5 SM-11: If with no Temporary temporary the Batch batch plants site, include a statement Plant (TBP) are associated in the notes. TBP-1 to TBP-2 N EC -14: Wind Erosion/Dust Control (DC) I DC -1 N/A Site Stabilization: EC -1: Surface Roughening (SR) I SR -1 to SR -2 SR -3 to SR -4 EC -2: Temporary/Permanent Seeding (TS/PS) J TS/PS-1 to TS/PS-2 N/A Weld County Guidance for Reseeding ✓ WC Reseeding and Seed Tips Mixes N,''A EC -4: Mulching (MU) ✓ MU -1 to MU -2 N /A EC -6: Rolled Erosion Control Products (RECP) RECP-1 to RECP-S RECP-6 to RECP-9 Other Control Measures (i.e. proprietary products): APPENDIX I - Traffic Impact Study Checklist WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Traffic Impact Stud Checklist Project Name: If a Traffic Impact Study is determined to be required, this checklist is intended to assist the applicant's engineer with developing a Traffic Impact Study that supports the intent of the Weld County Code using commonly accepted engineering practices and methodologies. Traffic Impact Study Report Content Li Weld County Case Number Signed and stamped by a Colorado licensed PE Project Location and Traffic Impact Area Map Location Map, including existing and proposed roadway network and intersections ❑ Site description Existing and proposed land uses in vicinity of site Existing traffic conditions, including: Daily traffic volumes (counts conducted over 72 hours and within the previous 24 months) Intersection turning movement counts (AM/PM peak hour) (minimum of 2 hours per peak period and collected within the previous 12 months) Roadway classification Roadway characteristics and auxiliary lanes Access points and traffic control devices Background traffic projections for Short -Range and Long -Range Scenarios, including growth rate used Trip Generation (ITE or site -specific) and proposed truck percentages Vehicle types Trip distribution (proposed) Total proposed volumes for short-range (project opening) and long-range analysis years Operational analysis for existing year, short-term horizon with project traffic, and long-term horizon with and without project traffic along mainline roadways and existing and proposed intersections. L Existing and background operational and geometric deficiencies Identify deficiencies, including pedestrian/bicycle connections Identify any structurally or capacity deficient roads, intersections, or bridges within the study area or along a proposed haul route Appropriateness of existing and proposed access locations compared to the required access spacing in the Weld County Code Is a CDOT Access Permit required? Signal warrant analysis (if proposed) Identify need for auxiliary lanes (right/left turn lanes), including storage capacity and length based on County guidelines and State Highway Access Code requirements for Rural Highways (Classification R -B) Sight distance analysis at access points Safety analysis based on crash history (if requested by County) Paving threshold analysis Tracking control measures Are parking needs for development met? Identify safe route to school and/or school bus stops Identify accessibility to public transit Proposed haul route (if applicable) Identify proposed mitigation and recommendations Summary of findings Include any assumptions and adjustment factors Any additional information necessary for special considerations Department of Planning and Zoning Development Review11402 1402 N. 17th Avenue. Greeley, CO 80632 I Ph: 970-400-6100 www.weld.goviGovernment/Departments/Planning-and-Zoning/Development-Review APPENDIX J - Weld County Standard Details WELD COUNT" ENGINEERING & CONSTRUCTION CRITERIA 10'-O r 4- SYMMETRICAL ABOUT I f ' PARALLEL 4' 1 He--- TO I `` ' ROADWAY $ SLOPE SHALL MATCH MEDIAN SLOPE, .S■ U U 11IHNI11di Illern PI J ' 1 4 Lop- A INLET WITH DITCH PAVING EARTHWORK ASSOCIATED WITH DIKE. INCLUDED IN THE COST OF THE INLET STEEL GRATE QUANTITIES NO. PIECES DESCRIPTION LENGTH LBS PER FT. WEIGHT (LBS.) 4 S4 x 7.7 BEAM 41" 7.90 106 2 3%2" x I/4" FLAT 26%" 2.98 13 2 3" x I/4" FLAT 26%" 2.55 12 II L CROSS PIPE B B SECTION VIEW TOTAL LBS. - 131 SLOPE TO FIT DIKE 10;1 NORMAL MEDIAN DITCH GRADE --� CON1`ECt 1NG PIPE tj$GtIA OF oTia4 Alt SNOwK4P� Dv AIL. SECTION B -B INLET CONNECTED TO A CROSS PIPE jlt Al 4'-0" --I MEDALLION (SEE NOTE 10)-. 3' MIN. CLEARANCE PLAN -I- - -- --1.1 ' RECESS FOR GRATING 42" 18" 6" 4 36" 6" 12" YIN. 3" MIN. CLEARANCE _ eitt S Sr T 11 402-1— — --IL ill ' 4 fA '12"'CENTER' I 1 I 1 I (T_) I _ I t i --4-i402- —'�la' I I L Ii I- ` " I` 1, I I I N I ' ri j —�—+ —402—r rfJ-r I Iv X11 \ 00 4% ,I I / Ay 'Id] +-._ -1-f =-r1==3=402=i-_=..t.• HEIGHT OF DIKE _ —16" F- 11-0" ` SLOPE 1/2" PER FT. MAX. r� 4'-O" �I THIS SLOPE SHALL BE SHOWN ON THE PLANS CONNECTING PIPE IN CASES OF SKEWED PIPE, THIS DIMENSION SHALL BE SHOWN SKEW ON THE PLANS ,ANGLE CONNECTING PIPE Ct OF MEDIAN OR DITCH 4" CONCRETE SLOPE AND DITCH PAVING (REINFORCED) (REQUIRES 1.3 CU. YD.) SECTION A -A INLET ON GRADE (FLOW FROM ONE DIRECTION) SLOPE %2" PER FT. MAX. SLOPE '/2" *4" CONCRETE SLOPE AND DITCH PAVING INLET (REINFORCED) (REQUIRES 1.3 CU. YD.) INLET CONNECTED TO A SKEWED CROSS PIPE 4 • MEDIAN DITCH GRADE PER FT. MAX. �- - 4" I'.. 4'-0" 3C" 48" ELEVATION t1 CONCRETE INLET 16" MAX. 3" x 1/4" FLAT SECTION D —D D tio _ 3/'x1/4"11 FLAT ,�`_ 3" x VI" FLAT S4 x 7.7-� BEAMS SECTION A —A 13)(6" (t1/e") *CONCRETE SLOPE AND DITCH PAVING WILL BE REQUIRED WHEN SHOWN ON THE PLANS. INLET AT BOTTOM OF VERTICAL CURVE (FLOW FROM TWO DIRECTIONS) Computer File Information Creation Dane 07/31/2019 Last Modifies Date 07/31/2019 F„II Path Drawing File Name: AutoCAD Version 2018 Scale AS NOTED Units English JL D 4 3"--I SLOT DETAIL 3" 2" GRATE INSTALLATION DETAIL 311 11/6I" x I" SLOTTED HOLE 11/2" 3" x 1/4" ALTERNATE SLOT AND HOLD DOWN PLATE DETAIL GENERAL NOTES 1. INLET TYPE C IS NOT HS -20 RATED AND SHALL NOT BE PLACED IN PAVED ROADWAYS. THIS INLET SHALL BE USED ONLY OUTSIDE PAVED ROADWAYS. 2. CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. 3. REINFORCING BARS SHALL BE GRADE 60, EPDXY COATED, AND DEFORMED 14, AND SHAT t HAVE A MIN. 2 INCH CLEARANCE. CUT OR BEND AROUND PIPES AS REQUIRED. 4. CONCRETE SLOPE AND DITCH PAVING SHALL BE IN ACCORDANCE WITH SECTION 507. REINFORCEMENT FOR CONCRETE SLOPE PAVING SHALL BE 6X6 -W1.4 XW1.4 (1R6X6-W2.1XW2.1. 5. STRUCTURAL STEEL FOR GRATES AND GRATE INSTALLATION HARDWARE SHALL BE GALVANIZED, AND SHALL BE IN ACCORDANCE WITH SUBSECTION 712.06. 6. THE STANDARD INLET GRATES SHALL BE USED ON ALL TYPE C INLETS UNLESS CLOSE MESH INLET GRATES ARE SPECIFIED ON THE PLANS. 7. CLOSE MESH GRATES ARE RECOMMENDED WHERE FOOT TRAFFIC OR BICYCLE ROC"' ARE IN CLOSE PROXIMITY TO GRATE. THIS GRATE IS NOT ADA COMPLIANT OR B. FRIENDLY AND SHALL NOT BE PLACED DIRECTLY IN SIDEWALKS, CROSSWALKS Of 8. STEPS SHALL BE PROVIDED WHEN INLET DIMENSION "H" IS EQUAL TO OR GREAT THAN 3 FEET - 6 INCHES AND SHALL CONFORM TO AASHTO M 199. 9. SEE STANDARD PLAN M-604-11, FOR REINFORCEMENT AROUND THE PIPE OPENING. 10. ALL INLETS SHALL HAVE A 4 INCH DR METAL MEDALLION WITH A "NO DUMPING MESSAGE ON IT. THE MEDALLION SHALL HAVE A FISH SYMBOL WITH A BLUE BAC IT SHALL BE FIRMLY ATTACHED TO THE TOP OF THE INLET WITH A PERMANENT REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-10. REFER TO LATEST M & S STANDARDS. WITH MODIFICATIONS TO THE 41'/2" CLASS OF CONCRETE AS SHOWN IN THE `Ot,' (±1/41 GENERAL NOTES ON THIS DETAIL. 'Sir T T i 41/411 OPEN SLOT (TO FACILITATE F -.r8" I I -tGALVANIZING) I'CTRS 26%" (±'/4") STANDARD INLET GRATE Index of Revisions Dale Comments Initials CENTERLINE OF GRATE PARA-LEL TO CENTERLINE OF ROADWAY 4" x %" BAR 3%2" x 1/4" FLAT 3" x 1/4" FLAT SECTION E -E WELD COUNTY PUBLIC WORKS DEPARTMENT 1111H STREET P O BOX 758 GREELEY, CO. 80632-0758 PHONE: `970) 356-4000 FAX (970) 304-6497 QUANTITIES FOR ONE INLET ♦ mir H CONCRETE (CU. YDS.) STEEL (LBS.) 76 NO. STEPS .13EQ'D 0 21-6" 1.0 3'-0" 1.1 81 0 3'-6" 1.2 97 0 4'-0" 1.3 102 1 4'-6" 1.5 117 2 5'-0" 1.6 123 2 5'-6" 1.7 138 2 6'-0" 1.9 143 3 6'-6" 2.0 159 3 7'-0" 21 - 164 3 7'-6" 2.2 180 4 81-0" 2.4 185 4 8'-6" 2.5 200 4 9'-0" 2.6 206 5 9'-6" 2.8 221 5 10'-0" 2.9 236 6 11'-6" 3.3 252 6 V PIPE INSIDE DIAMETER SHALL BE 30 IN. OR LESS. CONCRETE AND STEEL QUANTITIES ARE FOR ONE ENTIRE INLET BEFORE DEDUCTION FOR VOLUME OCCUPIED BY PIPE. WEIGHT OF STEEL INCLUDES A RING FOR TIE MAXIMUM PIPE DIAMETER. BAR LIST FOR H = 2 FT. -6 IN. AND BENDING DIAGRAM 3" TYPICAL HEX. ROUND OR TWISTED CROSS BARS AT 8 IN. CTRS. WELDED TO 4" x %" BEARING BARS SPACED AT 2%" CTRS. 3" x 1/4" FLAT 41/411 (±1/4") CLOSE MESH INLET GRATE As Constructed No Revis;ons Revised Void MARK REO'D HEIGHT LENGTH 401 2 2'-21/2" 8'-0" 401 6 2'-7" 8`-8" 402 4 "U" 15'-4" NO. 401 111V I " I.._,,,„_.4 "U" INCREASE DIMENSION 6 IN. FOR EACH 6 IN. INCREASE OF "H" ABOVE 2 FT. -6 IN. 6" MIN. 31 711 L :2111 MIN. NO. 402 �� ADD ONE BAR FUR EACH FT INCREASE OF ''H" ABOVE 2 FT. - 6 IN. 402 BARS SHALL BE EQUALLY SPACED FROM EACH OTHER. SLUT DETAIL IN 3%2" x y4" FLATS SAME AS IN STANDARD INLET GRATE INLET, TYPE C Designer COOT Detailer COOT Sneet Subset: Know what's below. Call b;torc ya., dui Project No./Code Sheet Subset: of 1 Sheet Number of ICI OPEN SLOT (TO FACILITATE L 8" I I I GALVANIZING) CTRS. 26%' (t!/4 STANDARD INLET GRATE TWO STEEL GRATE PER INLET QUANTITIES " !" R. 3" x 1/4" FLAT SLOT DETAIL 11/4" 3"x1/,u ALTERNATE SLOT AND HOLD DOWN PLATE DETAIL GRATE INSTALLATION DETAIL TRANSVERSE VIEW CENTERLINE OF GRATE PARALLEL TO CENTERLINE CF ROADWAY 4/4" (±1/4") 12' MIN. >4 14 BAR AROUND I 1� PIPE , - 1 11 1 I, I I 11 - 1- 11- 14" 47" 41" 35" INLET GRATES FLOW LINE OF INLET AND PIPE 14" #4 AT 12" CTRS. (TYP.) 16' MAX 6" WALLS AND FLOOR (TYP.) TRANSVERSE CROSS SECTION EARTHWORK ASSOCIATED WITH DIKE INCLUDED IN THE COST OF THE INLET DIKE NO_ PIECES DESCRIPTION LENGTH LBS PER FT. WEIGHT (LBS.) 8 54 x 7.7 BEAM 40" 7.70 206 4 3'/2" x '/4" h L Al lbtg" I.98 lb 4 3" x 1/4" FLAT 26%" 2.55 24 Last Modified Date AutoCAD Version: 2018 Scale AS NOTED Units English TOTAL LBS. - 256 Computer File Information 07/31/2019 07/31/2019 Dale 12" MIN. FLOW i 5" 68' I 18'/2" {-41/21 ••?' -/ N N SI •-- #4 BAR L / 12" LAPt1 42 LONGITUDINAL 80" 18'/2" MEDALLION (SEE NOTE 9 ) 1 3" CLR. II�\ CONCRETE 4X c r j PIPE O.D. • I N A. lD �/ 3" MIN. "74/A CLEARANCE #4 AT 12" CTRS. (TYP.) #4 AT 12" CTRS. CROSS SECTION LEVEL GRATE INSTALLATION LONGITUDINAL VIEW SECTION D -D 4" x J/" BAR Know what's below. Call before you dig. Index of Revisions Comments. E CLOSE MESH GRATE Initials #4 AT 12" CTRS. (TYP.) DIKE ›A. I > N - A 6" WALLS AND FLOOR (TYP.) >•w - - D D GENERAL NOTES INLET TYPE 0 IS NOT HS -20 RATED AND SHALL NOT BE PLACED IN PAVED ROADWAYS. THIS INLET SHALL BE USED ONLY OUTSIDE PAVED ROADWAYS. 2 CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. 3. SEE PLANS FOR SIZE AND LOCATION Of PIPE. 4. STRUCTURAL STEEL FOR GRATES AND GRATE INSTALLATION HARDWARE SHALL. BE GALVANIZED AND SHALL BE IN ACCORDANCE WITH SUBSECTION 712.D6. 5. STANDARD INLET GRATES SHALL BE USED ON ALL TYPE 0 INLETS UNLESS CLOSE MESH GRATES ARE SPECIFIED ON THE PLANS. 6. CLOSE MESH GRATES ARE RECOMMENDED WHERE FOOT TRAFFIC OR BICYCLE ROUTES ARE IN CLOSE PROXIMITY TO CRATE. THIS GRATE IS NOT ADA COMPLIANT OR BICYCLE FRIENDLY AM) SHALL NOT BE PLACED DIRECTLY IN SIDEWALKS, CROSSWALKS OR BIKE PATHS. 7. STEPS SHALL BE PROVIDED WHEN INLET DIMENSION "H" IS EQUAL TO OR GREATER THAN 3 FEET -6 INCHES AND SHALL CONFORM WITH AASHTO Al 199. 8. REINFORCING BARS SHALL BE GRADE 60, EPDXY COATED, AND DEFORMED #4, AND SHALL HAVE A 2 INCH MIN. CLEARANCE. CUT OR BEND BARS AROUND PIPE AS REQUIRED. 9. ALL INLETS SHALL HAVE A 4 INCH DIA. METAL MEDALLION WITH A "NO DUMPING DRAINS TO STREAM" MESSAGE ON IT. THE MEDALLION SHALL HAVE A FISH SYMBOL WITH A BLUE BACKGROUND. IT SHALL BE FIRMLY ATTACHED TO THE INLET'S SURFACE WITH A PERMANENT FASTENER. 14" 14" 1 #4 AT 12" CTRS TRANSVERSE CROSS SECTION LONGITUDINAL CROSS SECTION SLOPING GRATE INSTALLATION %" TYPICAL HEX. ROUND OR TWISTED CROSS BARS AT 8 IN. CTRS. WELDED TO 4" x %" BEARING BARS SPACED AT 2%" CTRS. I) 3"xt/4"FLAT (11/4„) 3" x 'A" FLAT SECTION E -E SLOT DETAIL IN 31/2" x 1/4" FLATS SAME AS IN STANDARD INLET GRATE WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY CO 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 OUTLET PIPE INSIDE D1A FT. - "D" MIN. "H" FT. 1.5 3.0 2.0 3.5 2.5 4.0 3.0 4.5 3.5 5.0 REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION SIANUAHU M-bU4-I I. (t t.k IU LAItJI M & 3 STANDARDS. WITH MODIFICATIONS TO THE CLASS OF CONCRETE AS SHOWN IN THE GENERAL NOTES ON THIS DETAIL. As Constructed No Revisions Designer Detader #4 AT 12" CTRS. (TYP.) CONCRETE PIPE 0.0. 3" MIN. CLEARANCE 80" 41V2' 1 polo 24',z " 31" BOLT CTRS. 371/2" BOLT CTRS. • 4; • PLAN VIEW (SHOWING ANCHOR EiUULI LAYOUT) • "H" FT. CONCRETE CU. YDS. -- STEEL LBS. CIRCULAR PIPE RANGE INSIDE DIA., IN. - "D" 1 3.0 1.5 127 18 3.5 1.7 149 18-24 4.0 1.9 157 18-30 4.5 2.0 179 18-36 5.0 2.2 187 18-42 5.5 2.4 208 18-42 6.0 2.6 215 _ 18-42 6.5 2.8 236 18-42 7.0 2.9 243 18-42 7.5 31 264 18-42 8.0 3.3 271 18-42 8.5 3.5 292 18-42 9.0 4 3.6 299 18-42 9.5 3.8 320 18-42 10.0 4.0 _ 327 18-42 CONCRETE AND STEEL QUANTITIES ARE FOR ONE ENTIRE INLET BEFORE DEDUCTION FOR VOLUME OCCUPIED BY PIPE. WtjgHT0 OF STEEL INCLUDES A RING FOR THE MAXIMUM PIPE lotAit 1. QUANTITIES FOR ONE INLET INLET, TYPE D CDOT CDOT Sheet Subset Sheet Subset: 1 of 1 Project No./Code Sneer Number of 6'-4" INLET 8" 11`-4" 26'-4" L-5'-0" B -ei GENERAL NOTES: * FOR LENGTH (L) 10 FT. OR MORE, PROVIDE 5'/? L=10'-0" --0- BARRIER L=15'-0" ., 8" 409 MAINTENANCE ACCESS AT BOTH ENDS WITH SHEET 2. 409 CURB FACE 5' TRANSITION 409 AN ADDITIONAL MANHOLE RING AND COVER. - - A - -1 r A CUT REINFORCEMENT BAR ACCORDINGLY.* 403 WHEN A TYPE R 503 t--•-• 601 r-�' WI 601 + INLET IS USED WITH ..� _ STATION POINT AT MIDPOINT j N MOUNTABLE CURB AND '"'" 4• 03 OF INLET ALONG FLOWLINE 36" I GUTTER, 5 FT. TRANSITION MOUNTABLE RODS RODS BE FACE OF ' I ; ENDS OF 8 ( BEAMSHALL g..o C, N 15' TRANSITION SHALLTOBE PAID CURB FACE t 3" CLR. CURB _ �' FFACE OF + ' INLET INLET FOR AS CURB AND GUTTER. MOUNTABLE - - } /- CURB - - - - - - - - - - CURB AND GUTTER ►r ♦? :�r= �- = • ill. TRANSITION CURB ---30" 30" MEET SHAPE OF NORMAL BARRIER 30" 30" 3°H ---"\e- i_ ONE 1'/4" DR ROD DIRECTION 3", EACH ENO CURB AND GUTTER HERE. ♦ - FOR A P-0" PAN SLOPE 2" PER FT. IN 5' INLET * OF FLOW SEE CHANNEL LAYOUT ON SHEET 2. s 2'-0" 4'-4" 3' - - INLET PAY LENGTH - 3' - TRANSITION B TRANSITION I g••1 8 CB.5 „ 11/4SLOPE 2% TO GUTTER GUTTER PLAN VIEW GUTTER 11/2" to- 4"-- 4 BAR r� 18M LONG it/4" R I 409 8 D.C. SLOPE =1"/FT. 601 CUT OFF OR BEND BARSTOCLEAR FLUSH WITH t �� LEG - 4 �� MANHOLE L-5'-0" L =10'-0" L 15'-0" 3" .. 2" FACE 33V • .{. --t �" 9 503lc - 409 (TYPE 2 -SE I1B) 9 1+ r 409 409 - I I MANHOLE I • - • 8" 6" INLET STEPS 403 ' :� _� 403 :� a03 I 2" CLR. 8" t _' >6. 403 �� FOR AI L H 2 3�-0�� 2"CLR. °_._� i I .601 �• 503 /REQV. 601 601 601 601 C t 501 • ' 6" 1 i 401 3 .--� 401 401 (/� I 0 " Il O.C. .r o 0 401 2.l 1 " 5/z O.C. �--� 51/2 O.C. 'I2:1 3" CLR. ° t 408 x L= 5' MN ', f- HS5' • H55' x • " 1/p PIPE SPACER 12" O.C. L =10' OR 15' N H55' • AND 1t/i" LOCK NUT a• o o , 16" MAX. 9" O.C. TYP 9" O.C. 811 • ' ' /"r \ • 1 • • 3" CLR. 3" CLR. • • s • ■ t40/ �- 4d / ` 407 . • • I� g" . it - •'• o o • o• ' 8" WALL (TYP.)--« (r~ 40 403 403 • • • • • •4 �� 407 .., ..— 8" WING 1 403 •• 401 + 403 . .. 9" O.C. r 1 - ' f o • • �, . _ • - . • • • - �► . • 11/4" DIA.. x 24.. �i 401 12" ' _. _ _ '-•• ° - ° ' - • 2" ALL `. • _ r-�� is GALV. STEEL ROD A 2 1N. DIAMETER TEMPORARY141% HOLE FOR DRAINAGE SHALL 402 J "11" O.C. 11 O.C. 401 407 -9" O.C. • - r . : , �� /• AROUND 2 -6 O.C. [11" 3" CLR, 405 406 _ 405 406 405 406 10" (TYP.)_. EMBEDMENT • 4� BE PLACED AT SUBGRADE ELEVATION OR A MINIMUM O.C.'I (T"'- 6" O.C. 6" O.C. 6" O.C. 6" O.C. 6" O.C. 6" O.C. THREE N 1/4 INCHES BELOW r ROAD BASE. THE HOLE �- - - ' - 1 6'-8" 11'-8" 16'-8" 3"x3"x%" PLATE x - SHALL BE PLUGGED WITH 403 SECTION A -A REGULAR INLET CONCRETE BEFORE ACCEPTANCE OF THE 9" D.C., , `� D CURB FACE ASSEMBLY r b -+-� D C 601 C L= 10'-0" I i L = 15'-0"� *PLACE ENTIRE ASSEMBLY BEFORE POURING CONCRETE. 502 INLET. , _ ' - l 2" ALL AROUND 503 502 502A 504 i 409 501 409 4 8"' , ^ " ' " 502 s, t t 1 r 1 I...-- ll I il 32" CONSTANT 413 409 403 413 403 403 ' I I I i Z MIN. 0.5X� PE 'r Cl R• 1 17H 2 403 CONSTANT t I L ` " 9 Q.C. 4p8 nII 407 ` 401 g" 3�� 5 3" CLR. max_ - .Ra _ _ _�.p. > 5' I411 412 �� II II A 413 g O.C. 6"406 Q.C. 403 ,:— 410 i 411 ail 413 II I II SECTION B-8 - - VARIABLE m— - - — — --i END VIEW ,t, ,r us C D C D !I II i NOTE: COVER,811 REFERENCE: b 2" UR. . 405 }� AMANHOLE ND OUTFLOW PIPE BE LQC�A1TEpINT COLORADO DEPARTMENT OF AT THE SAME END OF THE INLET. 1 3-411 12" SECTION A -A INLET TRANSPORTATION STANDARD 11" Q.C. _ _ M-604-12 (SHEET I OF 2) 406 WITH N CaHbefoeyowuatg. DROP BOX H>5 FT. SECTIONS C -C & D -D (DOTTED BARS ARE IN SECTION D-0) Computer File Information Index of Revisions WELD COUNTY As Constructed CURB INLET TYPE R Project No./Code Creation Date 07/31/2019 Date: Comments. Initials: •�. ,� PUBLIC WORKS DEPARTMENT '""' 1111 H. STREET No Revisions. Last Modifies Date 07/31!2019 FJ Path et. T1 — ,r'— % P.O. BOX 758 GREELEY, CO. 80632-0758 Revised Designer. 9 COOT Drawing Fie Name: Detailer COOT 4-r +. NY PHONE: s=' FAX (970) (970) 3564000 304-6497 Sheet Number of Void AutoCAD Version:: Scale AS NOTED Units English Sheet Subset: Sheet Subset: 1 of 2 MARK BAR OR SIZE SPACING TYPE ALL INLETS INLETS: H < 5 FT. INLETS: H > 5 FT. L =5 FT. L =10 FT. L =15 FT. w L =10 FT. L=15 FT. NO. REO'D. LENGTH NO. REQ'D. LENGTH NO. REQ'D. LENGTH NO. REQ'D. LENGTH NO. REQ'D. LENGTH 401 4 11" II 15 * 21 * 26 * 11 V 11 402 4 11" II 7 4 13 4 18 4 7 $ 7 4E 403 4 9" II I' 4'-0" 4f 4'-0" * 4'-0" * 4'-0' * 4'-0" 405 4 6" VI lI 6'-10" 21 6'-10" 31 6'-10" 11 6'-10" 11 6'-10" 406 4 6" VIII 7 8'-10" 7 13'-10" 7 18'-10" 7 8'-10" 7 8'-10" 407 4 9" II V 51-I0" * 10'-10" * 15'-10" * 5'-10" * 5'-10" 408 4 12" II 3 6'-l0" 3 ll'-10" 3 16'-0" 3 I1'-10" 3 16'-0" 409 4 8" II 6 5'-10" 6 10'-10" 6 151-10" 6 10'-10" 6 15'-10" 410 4 11" VII . 3 3 1 411 4 11" II 3 5'-2" 3 10-2" 412 4 11" II 3 2'-9" 3 2' 9" 413 4 9" II 7 10'-10" 7 15'-10" 501 5 5'/2" 1V 11 31-4" 22 3'-4" 33 3'-4" 22 3'-4" 33 3'-4" 502 5 5%2" III 11 11'-5" 17 11'-5" 503 5 5'/2" II 5 3'-6" 16 3'-6" 27 3'-V 6 3'-6" 6 31-6" 504 5 5'/y" IX 5 8'-4" 601 6 2'/?" V 2 8'-10" 2 8'-L0" 2 8'-10" 2 8'-10" 4 8'-10" '818.5 1 5'-10" 1 10'-IO" 1 15'-10" I 10'-10" I 151-10" 2 RARS,1 RODS 4 BARS, 3 RODS 8 HAAS, 5 RIES 4 MIS, 3 %ES 8 BARS, 5 lulls * VARIABLE REFER TO TABLE TWO. INCLUDE 114,18 IN. BARS (SEE CHANNEL LAYOUT) I' V REGULAR INLETS DROP BOX INLETS TABLE ONE " BAR LIST FOR CURB INLETS, TYPE "R" "H" LENGTH NO. RECD. NO. REQ'D. L • 5 FT. L - 10 FT. L - 15 FT. REGULAR DROP BOX 401 402 410 CONC. CU. YDS. STEEL LBS. CONC. CU. YDS. STEEL LBS. CONC. CU. YDS. STEEL LBS. 403 407 403 40/ I 3'-0" 2'-8" . 1'-8" 10 7 3.2 285 5.3 497 7.4 706 3'-6" 31-2'' 2'-2" 10 7 3.4 305 5.7 528 7.9 747 4'-0" 3'-8" 2'-8" 12 9 3.7 326 6.0 559 8.4 786 4'-6" 4'-2" 3'-2" 12 9 3.9 334 6.4 571 8.8 803 5'-0" 4'-8" 3'-8" 14 11 4.1 354 6.7 602 9.3 844 5'-6" 5'-2" 4'-2" 3'-5" 16 13 15 6 4.4 375 6.0 607 7 4 850 6'-0" 5'-8" 4'-8" 3'-11'' 16 13 16 6 4.6 382 6.2 616 7.6 860 6'-6" 6'-2" 5'-2" 41-5" 18 15 18 8 4.8 402 6.4 637 7.8 880 7'-0" 6'-8" 5'-8" 4'-11" 20 17 19 10 5.0 423 6.6 654 8.0 897 7'-6" 7'-2" 6-2" 5'-5" 20 17 20 10 5.3 430 6,9 664 8.3 907 81-0" 7'-8" 6'-8" 51-11" 22 19 22 12 5.5 451 7.1 684 8.5 927 8'-6" 8'-2" 7'-2" 6'-5" 24 21 23 14 5.7 471 7.3 702 8.7 944 9'-0" 8'-8'' 7'-8" 6'-11" 24 21 24 14 6.0 479 7.6 711 9.0 954 9'-6" 9'-2" 8'-2" 7'-5" 26 23 26 16 6.2 499 7.8 732 9.2 974 10'-0" 9'-8" 8'-8" 7'-11" 28 25 27 18 6.4 520 8.0 749 9.4 992 101-6" 10'-2" 9'-2" 8'-5" i 28 25 28 18 6.7 527 8.3 759 9.7 1001 11-0" 10'-8" 9'-8" 8'-I1" _ 30 27 30 _ 20 6.9 547 8.5 779 9.9 1022 NOTES: FOR L= 5 FT., L =10 FT., AND L =15 FT. REGULAR IM.E IS: TOTAL QUANTITIES NEEDED ARE OUTSIDE THE HEAVY Bt ACK LINE. DROP BOX INLETS: TOTAL QUANTITIES NEEDED ARE INSIDE THE HEAVY BLACK LINE. 5 I EEL WEIGH'S S UU NO( INCLUDE S I NUC I URAL S t EEL CHANNEL. TABLE TWO BARS AND QUANTITIES VARIABLE WITH "H" Computer File Information Creation Date 07/31/2019 Last Modiftea Date 07/31/2019 Full Path Drawing Fie Name: AutoCAD Verson: 2018 Scale AS NOTED Units Enrlish Index of Revisions Comments. Initials PLAN VIEW 30" -er 1" "Znr ELEVATION VIEW MANHOLE COVER (TYP.) 24'/t+" 4" ELEVATION VIEW WEIGHTS: COVER = 125 LBS. + RING = 135 LBS. MANHOLE RING (TYP.; TOTAL = 260 LBS. TYPE II TYPE III TYPE IV LENGTH I 4411 31" 41" f+-- 2i- 1„ I 502 GENERAL NOTES L CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. 2. CONCRETE WALLS SHALL BE FORMED ON BOTH SIDES AND SHALL BE 8 INCHES THICK. 3. INLET STEPS SHALL BE IN CONFORMANCE WITH AASHTO 14 199. 4. CURB FACE ASSEMBLY SHALL BE GALVANIZED AFTER WELDING. 5. EXPOSED CONCRETE CORNERS SHALL BE CHAMFERED Ye OF A INCH. CURB AND GUTTER CORNERS SHALL BE FINISHED TO MATCH THE EXISTING CURB AND GUTTER BEYOND THE TRANSITION GUTTER. 6. REINFORCING BARS SHALL BE DEFORMED AND SHALL HAVE A 2 INCH MINIMUM CLEARANCE. ALL REINFORCING BARS SHALL BE GRADE 60 AND EPDXY COATED. 7 DIMENSIONS AND WEIGHTS OF TYPICAL MANHOLE RING AND COVER ARE NOMINAL. 8. MATERIAL FOR MANHOLE RINGS AND COVERS SHALL BE GRAY OR DUCTILE CAST IRON IN ACCORDANCE WITH SUBSECTION 712.06. 9. SINCE PIPE ENTRIES INTO THE INLET ARE VARIABLE, THE DIMENSIONS SHOWN ARE TYPICAL. ACTUAL DIMENSIONS AND QUANTITIES FOR CONCRETE AND REINFORCEMENT SHALL BE AS REQUIRED IN THE WORK. QUANTITIES INCLUDE VOLUMES OCCUPIED BY PIPES. 10. STRUCTURAL STEEL SHALL BE GALVANIZED AND SHALL BE IN ACCORDANCE WITH SUBSECTION 712.06. 11. ALL MANHOLE COVERS SHALL BE CAST WITH A "NO DUMPING DRAINS TO STREAM" MESSAGE AND A FISH SYMBOL THE SURFACE OF THE MANHOLE COVER SHALL HAVE A NON -SLIP PATTERN. REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-12 (SHEET 2 OF 2). REFER TO LATEST M & S STANDARDS, WITH MODIFICATIONS TO THE CLASS OF CONCRETE AS SHOWN IN THE GENERAL NOTES ON THIS DETAIL. TYPE V 23" 24" 23" 2 94 BARS FDR 5 FT. INLET ONE 1%2 IN. HOLE 29" 24" 24" 24" 29" 6" -t i 2" 12" 6" 14 BARS FOR 10 FT. INLET 35"---4-- 30"--1- 30"-• - 35" -al THREE 1'/Z IN. HOLES 10'-10" 818.5 SECTION AT HOLE (TYP.) 8 #4 BARS FOR 15 FT. INLET 35"--61.- 30"- l 30" - 30"- - 30 --- 35"--d FIVE 1'1z IN. HOLES 15'-10" - - CHANNEL LAYOUT DETAILS SEE CURB FACE ASSEMBLY ON SHEET 1. TYPE VI 2 20" L 405 j--- 4r-0 TYPE VII TYPE VIII F 20" —0I VARIES --•I 406 Know what's below. Call before you dig. TYPE X I 22" L 504 l---- 44 " 34" BAR BENDING DIAGRAMS (DIMENSIONS ARE OUT -TO -OUT OF BAR) WELD COUNTY PUBLIC WORKS DEPARTMENT 1111H STREET P O. BOX 758 GREELEY CO. 80632-0758 PHONE (970) 356-4000 FAX (970) 304-6497 As Constructed No Revisions. Revised Void CURB INLET TYPE R Designer COOT Detatler CDOT Sheet Subset. Sheet Subset 2 of 2 Project No./Code Sheet Number of -U ; 4'-0" 1 2'-0" 2'-C A f A t -B PLAN VIEW TYPE 13 INLET FOR GUTTER TYPE 2 401 F 51.,7' SECTION A -A D MAX=30 IN. FOR H>4 H. Y Y t x A 402 F x BENDING DIAGRAMS ALL DIMENSIONS ARE OUT -TO -OUT OF BAR. Computer File Information Crea: on Da:e 07/31/2019 Last VVodifiea Date 07/31/2019 FIlPat D'awing Fie Name: AutoCAC Version 2018 Scale AS NOTED Un is English GUTTER TYPE 2 A 403 Know what's below. Call before you dig. CORNERS RELIEVED )6" TO PREVENT ROCKING \ C -f- (TYP.) REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-13. REFER TO LATEST M & S STANDARDS. WITH MODIFICATIONS TO THE CLASS OF CONCRETE AS SHOWN IN THE GENERAL NOTES ON THIS DETAIL. WHEN HMA MATERIAL IS TO EXTEND TO THE EDGE OF THE GRATING FRAME, CONCRETE MAY BE DEPRESSED. SECTION B -B D MAX = 18 IN. Ilk ALL H D L 7r I I II II I I II tI I II I 221/? 3'/" kAPIArIAPIAMAMAPA_ :. " $ 48'W' 1%" r 39%8" 5" 4'1441 --p Index of Revisions Date Comments Initials k 1" %" RADIUS (TYP.) SECTION C -C A=l�4" B_lttye c=713'&" E } _ II C -'-- NO. 13 GRATE F 1)-± I t SECTION D -D 1x 45°� I I3a_' b .- 3" t F E r NO. 13 GRATING & FRAMES 1 40" SECTION E -E APPROXIMATE WEIGHT — -E J i" WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY. CO. 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 44" 1/e'1 te- 23" 1 ti1' " 2 lit 23'/8" 31'/a" SECTION F -F GENERAL NOTES 1. CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. 2. CAST -IN -PLACE CONCRETE WALLS SHALL BE FORMED ON BOTH SIDES. 3. EXPOSED CONCRETE CORNERS SHALL BE CHAMFERED % OF A INCH. 4. REINFORCING BARS SHALL BE DEFORMED 14 AND SHALL HAVE A 2 INCH MINIMUM CLEARANCE. ALL REINFORCING BARS SHALL BE GRADE 60 AND EPDXY COATED. 5. STEPS SHALL BE PROVIDED WHEN INLET DIMENSION "H" IS EQUAL. TO OR GREATER THAN 3 FEET -6 INCHES AND SHALL CONFORM TO AASHTO M 199. 6. ALL GRATES AND FRAMES SHALL BE GRAY OR DUCTILE CAST IRON IN ACCORDANCE WITH SUBSECTION 712.06. GRATES AND FRAMES SHALL BE DESIGNED TO WITHSTAND HS 20 LOADING. 7. STATION POINT IS AT THE CENTER OF THE INLET. 8. GRATE SHALL HAVE "DUMP NO WASTE DRAINS TO STREAM" MESSAGE CAST ON SURFACE. H CONCRETE REINFORCING STEEL NO. OF BARS 01 MAXIMUM PIPE I.D. A -A SEC. B-6 CU. YDS. 8 LB. REO'D. I IN. IN. 3'-0" 1.3 72 4 18 :8 3'-6" 1.5 76 4 24 :8 4i-0" 1.6 90 5 30 18 4'-6" I 1.8 104 6 30 :8 5'-0" 1.9 109 ti 30 18 5'-6" 2.1 122 / 30 '8 6'-0" 2.2 136 8 30 :8 6'-6" 2.4 :41 8 30 :8 7'-0" 2.5 _ 154 9 30 :8 7'-6" 2.7 168 10 30 18 8'-0" 2.8 173 10 30 18 8'-6" 3.0 187 11 30 18 9'-0" 3.1 200 :2 30 18 9'-6" 3.3 205 :2 30 :8 10'-0" 3.4 219 :3 30 :8 0 INCLUDES 1% FOR OVERRUN. NOTE: CONCRETE QUANTITIES INCLUDE VOLUME OCCUPIED BY PIPE. QUANTITIES FOR ONE INLET MARK N0. DIMENSIONS LENGTH REO'D. X Y 401 4 3'-6" 2'-2" 13'-4" 402 2 3'-4'/2' 2' 6'/z" 8'-5'/z„ 403 5 2'-'/2.. 2,_7" 7'-2t/2 ADD 6 IN. TO THIS DIMENSION FOR EACH 6 IN. INCREASE OF "H" OVER 3 FT. -0 IN. BAR LIST FOR H = 3 FT. -C) IN. As Constructed No Revisions Revised Void CONCRETE INLET TYPE 13 Designer CDOT Detailer CDOT Sheet Subset: Project No./Code Sheet Subset: 1 of ' Shee' tier of A --*-1 Ii'll 14 _ L r -' W C in DUMP NO RI NUNS Tea A PLAN B a sod in co 3/4" 12 1/2" r r r 6" II /A rl 1 1/2" SECTION A - A 1/2" TYPE III x ALL DIMENSIONS ARE OUT- TO -OUT BAR GENERAL NOTES; 1. ALL WORK SHALL BE DONE IN ACCORDANCE W1TH THE WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA. 2. CONCRETE SHALL BE CLASS D. INLET MAY BE CAST -IN -PLACE OR PRECAST. 3. ALL CONCRETE SHALL BE FORMED ON BOTH SIDES. 4. ALL EXPOSED CONCRETE CORNERS SHALL BE CHAMFERED 3/4". 5. ALL GRATINGS, FRAMES. RINGS AND COVERS SHALL BE CAST IRON. 6. REINFORCING BARS SHALL BE DEFORMED. GRADE 60. PER ASTM A615, AND SHALL HAVE A 2" MINIMUM CLEARANCE. 7. BARS MAY BE BENT OR CUT AT CULVERT ENTRANCES. 8. ALL CULVERTS SHALL BE SMOOTHLY GROUTED INTO THE WALLS OF THE BOX. 9. FOR INLETS WHERE H IS LESS THAN 3'-0", REINFORCING IS STILL REQUIRED AS DIRECTED BY THE ENGINEER, INLET FRAMES SHOWN ARE FOR SINGLE INLETS. ONLY DOUBLE INLETS REQUIRE FRAMES WITH CLIPPED FLANGES WI -SERE THE TWO FRAMES ABUT BENDING DIAGRAM 1 Fri TYPE II Il SEE NOTE 11 ACK OF CURB 2'-0" TRANSITION 1 -OUTSIDE WALL OF BOX I NSIDE WALL OF BOX a _ I {GRATE NOT SHOWN). L J OUTSIDE WALL OF BOX 0 SECTION B - B BAR LIST FOR H=3'-0" JARK " TYPE NO REQ'D TYPE 3 INLET LENGTH DIMENSIONS X Y 401 I 4 1-0" 1-0" 2'-0" 402 II 3 3'-7 1/4" 2'-l0 1/2" 14'-11 1/2- 403 III 2 3'-S 3/4" 12'-0 1/2" 7'-6 3/4" 404 in 4 7-9" D2'-1" 6'-11" r TYPE 3 DOUBLE INLET MARK TYPE NO REO'D DIMENSION Y LENGTH X 401 I 7 1.-0" '-O" 2'-0" 402 II 3 7-2 1/2" 2'-10 1/2" 22'-2" 403 III 2 7'-l" 2'-0 1/2" 11'-2" 404 III 8 2'-9" 2'-1" 6'-11" *ADD 6" TO THIS DIMENSION FOR EACH 6" INCREASE OF "H" OVER 3'-O" 45 9/16" SECTION THRU LENGTH FACE OF 6" VERTICAL CURB AND GUTTER "-LIP OF GUTTER DEETER NO. 2502-A SINGLE, CURB INLET FRAME, GRATE, CURB & PARTIAL FRAME PLAN OF TYPE 3 INLET FOR VERTICAL FACE CURB. GUTTER & SIDEWALK 6" VERTICAL CURB AND GUTTER 24" _ MATCH CURB BOX & TOP OF CURB TRANSITION 1 45 9/16" 9" _ L 3/32" 42" 2 3/16 42" 84" 100" DEETER #2502-A DOUBLE CURB INLET 10. INLET STRUCTURES SHALL NOT BE CONSTRUCTED UNTIL THE CURB AND GUTTER HAS BEEN INSTALLED, OR CONTRACTOR STAKES THE CURB & GUTTER FOR 100' ON EACH SIDE OF INLET CONTRACTOR MUST ALSO STAKE INLET BOX CORNERS. 11. ADD (4) #4 REBARS-16 INCHES LONG (MIN) EQUALLY SPACED AND 6" AT MID -DEPTH INTO THE TYPE 3 INLET CONCRETE & 10" AT MID -DEPTH INTO EACH SIDEWALK SECTION ADJACENT TO THE INLET (TYP L=5'). 4 ADDITIONAL BARS ARE REQUIRED FOR EACH 5' OF LENGTH ADDED FOR DOUBLE OR TRIPLE INLET. 12 ALL GRATES AND FRAMES SHALL BE GRAY OR DUCTILE CAST IRON CONFORMING TO COOT STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION -712.06. GRATES AND FRAMES SHALL BE DESIGNED TO WITHSTAND HS -20 LOADING. 13 MINIMUM CURB OPENING AREA = 150 SQ. IN. 14. MINIMUM REBAR SPLICE LENGTH SHALL BE 10". Computer File Information Creatcon Date JUNE 2008 Last Modified Date JUNE 2008 FrII Path Drawing He Name: AutoCAD Version: 2018 Scale AS NOTED Units English 45 17/32' 1 1/2" CLR SEE NOTE 11 (FOR DOWELS) H NO. OF 402 BARS REQ'D. 3'-0" 3 3'-6" 4 4'-0" 4 4'-6" 5 5'-0" 6 5'-6" 6 6'-0" 7 6'-6" 8 7'-0" 8 7'-6" 9 8'-0" 10 8'-6" 10 9'-0" 11 9'-6" 12 10'-0" 12 2% SLOPE HEIGHT OF WALL POUR REAR 2-44 AT 6" HORIZONTAL (20" LONG) 14 AT 16" VERTICAL (20" LONG) 0] W C 3 3 z .43 3/16" • • 600 RAIL 3'-3" LONG 2 3/8" 3/16" \\llllllN uR8 BOx iNLE T FRAME SECTION CENTER OF MULTIPLE INLETS e U. 2" X 4" KEY SLOPE TO OUTLET INV. ELEV OUT 3 HEIGHT OF WALL POUR FRONT 600 RAIL 3'-3" LONG FOR MULTIPLE INLETS L4D3 Q 8" Q.C_ L30" fi BSECTION THRU WIDTH 43 9/16" 45 17/32' OUTLET PIPE 2 3/16 2 3/16" r,l J 3 15 16" TYP 42 7 32' 43 9 16" 42 7 32" g 128" 144" REFERENCE: rITY 17F CRFFI FY STORMWATFR DFTAII 7-4A. JUNE 2008 DEETER #2502-A TR PLE CURB INLET # OF INLETS STD. DEPTH (Y) MIN a (D) MIN. SLOPE So SINGLE 3'-6" 18" 1 00% FRAME AND GRATE DOUBLE 4'-0" 18" 1 80% FRAME AND CRATE SHALL BE A TRIPLE 4'-6" 21" 1.80% DEETER 2502-A OR EQUAL Know what's below. Call before you dig. Index of Revisions Datii Commenls If'kik WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY. CO. 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 As Constructed No Revisions Revised Void COMBINATION INLET TYPE 3 (FOR VERTICAL FACE CURB) Des Tier City of Greeley Detaller City of Greeley Sheet Subset: Sheet Subset: 1 of 2 Project No./Code Sheet Number of 1----+4----- 548:113 - !4 IT i01 M M ON dVAG ;91. ] lb APLAN N 3/4" 12 1/2" , r6I mmimain to 1 1/2n SECTION A - A 1/2" 'v 0 GENERAL NOTES: 1. ALL WORK SHALL BE DONE IN ACCORDANCE WITH THE WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA. 2. CONCRETE SHALL MEET OR EXCEED METROPOUTAN GOVERNMENT ENGINEERING COUNCIL (MGPEC) SPECIFICATIONS, ITEM 11, PORTLAND CEMENT CONCRETE PAVEMENT; SECTION 11.2. MATERIALS. COOT CLASS 0 4,500 PSI CDOT SPEC 601. 3. ALL CONCRETE SHALL BE FORMED ON BOTH SIDES. 4. ALL EXPOSED CONCRETE CORNERS SHALL BE CHAMFERED 3/4". 5. ALL GRATINGS, FRAMES, RINGS AND COVERS SHALL BE CAST IRON. 6. REINFORCING BARS SHALL BE DEFORMED, GRADE 60. PER ASTM A615, AND SHALL HAVE A 2" MINIMUM CLEARANCE. 7. BARS MAY BE BENT OR CUT AT CULVERT ENTRANCES. 8. ALL CULVERTS SHALL BE SMOOTHLY GROUTED INTO THE WALLS OF THE BOX. 9. FOR INLETS WHERE H IS LESS THAN 3'-0", REINFORCING IS STILL REQUIRED AS DIRECTED BY THE ENGINEER. INLET FRAMES SHOWN ARE FOR SINGLE INLETS. ONLY DOUBLE INLETS REQUIRE FRAMES WITH CLIPPED FLANGES WHERE THE TWO FRAMES ABUT. 1 TYPE III x ALL DIMENSIONS ARE OUT -TO -OUT BAR m a 0 ADJUST CURB BOX TO TOP BENDING DIAGRAM x 1 TYPE I I 112" 4" SECTION B - B - BAR LIST FOR H=3'-0" 2" SEE NOTE 11 ACK OF CURB TRANSITION jr-OUTSIDE WALL OF BOX r NSIDE WALL OF BOX F ."----(GRATE NOT SHOWN) I f L J OUTSIDE WALL OF BOX a FACE OF DRIVE OVER CURB L UP OF GUTTER DEETER NO. 2502-A SINGLE, CURB INLET FRAME, GRATE, CURB & PARTIAL FRAME PLAN OF TYPE 3 INLET/DRIVE OVER CURB, GUTT R & SIDEWALK TRANSITION TO VERTICAL CURB AND GUTTER 24" TRANSITION I MATCH CURB BOX & TOP OF CURB .!. CURB HEIGHT + 2" SUMP - MARK TYPE N0 REVD TYPE 3 INLET LENGTH DIMENSIONS X Y 401 I 4 1'-0" '-0" 2'-0" 402 II 3 3'-7 1/4" 2'-10 1/2' 14'-11 1/2" 403 III 2 3'-5 3/4" 2'-0 1/2" 7-6 3/4" 404 III 4 2'-9' 2'-1" 6'-11" IAARK TYPE N0 REQ'D TYPE 3 DOUBLE INLET LENGTH DIMENSIONS X Y 401 I 7 1'-0" '-o" 2'-0" 402 II 3 7-2 1/2" 2'-10 1/2" 22'-2" 403 III 2 7-1 2'-0 1/2" 11'-2' 404 III 8 2'-9' 2'-1" 6'-11" *ADD 6" TO THIS DIMENSION FOR EACH 6" INCREASE OF "H" OVER 3'-0" 45 9/16" I s• • II . SLOPE TO OUTLET m 404 0 8" QC • 45 9/15' 8 40 56 8" SECTION THRU LENGTH = 2 3/16" /32" 42" I 42` TYP.) JJ3 84" 8" ^8- 100" DEETER #2502-A DOUBLE CURB INLET 10. INLET STRUCTURES SHALL NOT BE CONSTRUCTED UNTIL THE CURB AND GUTTER HAS BEEN INSTALLED. OR CONTRACTOR STAKES THE CURB & GUTTER FOR 100' ON EACH SIDE OF INLET. CONTRACTOR MUST ALSO STAKE INLET BOX CORNERS. 11. ADD (4) #4 REBARS-16 INCHES LONG (MIN) EQUALLY SPACED AND 6" AT MID -DEPTH INTO THE TYPE 3 INLET CONCRETE & 10" AT MID -DEPTH INTO EACH SIDEWALK SECTION ADJACENT TO THE INLET (TYP L=5'). 4 ADDITIONAL BARS ARE REQUIRED FOR EACH 5' OF LENGTH ADDED FOR DOUBLE OR TRIPLE INLET. 12. ALL GRATES AND FRAMES SHALL BE GRAY OR DUCTILE CAST IRON CONFORMING TO CDOT STANDARD SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION -712.06. GRATES AND FRAMES SHALL BE DESIGNED TO WITHSTAND HS -20 LOADING. 13. MINIMUM CURB OPENING AREA = 150 SQ. IN. 14. MINIMUM REBAR SPLICE LENGTH SHALL BE 10". Computer File Information Creat on Date JUNE 2008 Last Madden Date JUNE 2008 F II Patti Drawing Fie Name: AutoCAD Version 2018 Scale AS NOTED Un is En fish 45 17/32" 1 1/2" CLR SEE NOTE 11 (FOR DOWELS) HEIGHT OF WALL POUR REAR 2-#4 AT 6" HORIZONTAL (20" LONG) #4 AT 16" VERTICAL (20" LONG) H NO. OF 402 BARS REQ'D. 3'-0" 3 3'-6" 4 4'-0" 4 4'-6" 5 5'-0" 6 5'-6" 6 6'-0" 7 6'-6" 8 7'-0" 8 7-6" 9 8'-0" 10 8'-6" 10 9'-0" 11 9'-6" 12 IO'-o" 12 43 9/16" 45 17/32" 3 16" 60/ RAIL 3'-3 LONG 2 3/8" URB BOx INLET FRAME SECTION CENTER OF MULTIPLE INLETS HEIGHT OF WALL POUR FRONT 600 RAIL 3'-3" LONG FOR MULTIPLE INLETS 2 3/16" 2 3/16' 3 15 16" TYP. 42 7/32' } 43 9/16' 42 7/32" ss fl' 128" J B� 144" REFERENCE: CITY OF GREELEY STORMWATER DETAIL 7-4k JUNE 2008 DEETER #2502-A TR PLE CURB INLET / OF INLETS STD. DEPTH (Y) IN a (D) IN. SLOPE So SINGLE DOUBLE TRIPLE 3'-6" 4'-0" 4'-6" 18" 18" 21" 1.00% 1.80% 1.80% FRAME AND GRATE FRAME AND GRATE SHALL BE A DEETER 2502—A OR EQUAL Know what's below. Call before you dig. Index of Revisions Date I Comments Initials WELD COUNTY As Constructed PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY. CO. 80632-0758 PHONE: (970) 356-4000 FAX (70) 304-6497 No Revisions: COMBINATION INLET TYPE 3 (FOR DRIVE OVER CURB) Project No./Code Revised Designer City of Greeley Void Detailer City of Greeley Sheet Subset: Sheet Subset: of 2 Sheet Number of • FINAL GRADE .7>iV/ CONCRETE OR GROUT (TYP.) 24" DIA. MANHOLE RING AND COVER 2'-0" 'i 1 l6" MAX. '~ 48" MIN `', (UN:FORM SPACING BETWEEN STEPS) H 8" (TIP.) W+12" . i . . ECCENTRIC CONE (1'-2" MIN.) FLEXIBLE JOINT SEAL SHALL CONFORM TO AASHTO M 198 (TIP.) . 511 rti 1 -0" SLAB c PIPE • w 1 4:1 SLOPE . . , • • . • •- CL AS S B CONCRETE • l'-6" • 0 0 N 28"+ 2W-1- I.D (VARIES 7'-2" TO 11'-10") SECTION 4 (MAX. DEPTH FROM 6" MIN. DEPTH GRANULAR BEDDING MATERIAL 2-501 IN TOP SLAB (TYP.) 503 0 12' 4-1102 x 2'-8" LONG (PLACE DIAGONALLY AROUND OPENING) 3-1103 x 5'-0" 0 3" ti 1 J TOP SLAB PLAN Tr -1/ r17 2-501 IN TOP SLAB (TYP.) 9-401 SPACE EVEN* Y (TIP.) MANHOLE BOX BASE CLASS B CONCRETE MARK SIZE TYPE WT. BARS I.D. FORMULAS +T. 54" 60" 66" 72" 84" cr,' »': ' • 0.668 r • 'NO. REQ'D. LENGTH WEIGHT * 18 8'-1" 97.2 18 8'-8" 104.2 - 1----- 18 9'-3" 111.2 18 9'-10" 118.2 -----v 18 11'-0" 132.3 18 12'-2" 146.3 4 401 BAR LENGTH - 32" + 2W + I.D. 0.668 {NO. _ REQ'D. LENGTH WEIGHT * 5 5'-5" 18.1 5 6-0 20.0 5 6'-7" 22.0 5- 7i2 23.9 5 8'-4" 27.8 5 91-6" 31.7 402 BAR LENGTH I.D. + 2W 1.043 {LENGTH REQ'D. WEIGHT * 17 �� 7 -5 131.5 17 8-0 141.8 17 �� 8-7 152.2\ 17 �� 9 -2 162.5 17 �� 10 _4 183.2 17 11-6 203.9 501 BAR LENGTH = 24" + I.O.+ 2W 1.043 (NO. REQ'D. LENGTH 22 5'-0" 23 5'-0" 25 5'-0" 26 5'-0" 29 5'-0" 32 5'-O" 502 NUMBER BARS REQ'D. - 3 + (24:1.05.7.2W it ) WEIGHT ♦ 114.7 119.9 130.4 135.6 151.2 166.9 't-' !: 1.043 'NO. REQ'D. 16 16 18 18 20 24 503 +1 D +2 C 13 2 +1) LENGTH WEIGHT * 12'-10 214.2 13'-5" 223.9 14'-0 262.c 14'-7" 273.8 15'-9" 328.5 16'-11" 423.5 NUMBER BARS REQ'D. - \ 0 IT'W BAR LENGTH - 4'-9"+2(16+W+I.D./2) =; 5 I 1.043 REQ'D. LENGTH 12 8'-1" 14 8'-8" 14 9'-3" 16 9'-10" - 18 11'-0" 20 12'-2" 504 NUMBER BARS REQ'D. - 2 2w+I D.-4 +1) WEIGHT 0 101.2 126.6 135.1 164.1 206.5 253.8 BAR LENGTH = 32"+2W+I.D. 0 12 „ "' l 5313 /LENGTH ((NN0. REQ'D. WEIGHT * 4 7'-2" 152.3 4 7'-9" 164.7 4 8'-4" 177.1 4 8'-11" 189.5 4 10'-1" 214.3 4 11'-3" 239.1 1101 BAR LENGTH a 21" + I.D. + 2W r-- - INC. REQ'0. 4 4 4 4 4 4 RP.'':' 1'• ', . :1 I 5.313 { LENGTH 2'-8" 2'-8" 2-8" 2'-8" 2'-8" 56.7 TYPE I (WEIGHT 0 56.7 56.7 56.7 56.7 56.7 2'-8" STRAIGHT "NO. REQ'D. 3 3 3 3 3 3 11 I 5.313 , LENGTH 5'-0" 5'-0 " '-0 5" 5'-0" 5'-0" 5'-0" TYPE II r'-4'_9" --.11103 ,WEIGHT* 79.7 79.7 79.7 79.7 79.7 79.7 ll]16'w+1.0.12 + *R EINFORCING STEEL 1 L I AL 965.6 1,037.5 1,127.2 1,204.0 1,380.2 1,601.6 U u , 1„ 2 CONCRETE TYPE IN —4. 4-I ►—'- - CUBIC YARDS - TOTAL 6.0 6.6 7.3 8.0 9.5 11.1 110TE. OU;JITI11E3 .'IlE D,JJED DII MkOI2E BASE AND A 4 FT. MANHOLE ENTRANCE rut EIIll1,'IIQE INTO TOP TO ..110 EMIT room,7 SLAB :.I; +2W 38„ or BASE. QUANTITIES FOR CONCRETE MANHOLE BOX BASE 5-402 0 12" 3 502 4-1101 9-401 SPACE EVENL (TIP.) 16" + W + 1.012 OR TO WITHIN 3" OF CYLINDRICAL OPENING 4-1101 x 21" + 2W + LD. SPACE 0 3" (OVER CYLINDRICAL OPENING) let T 503 0 12" 9-401 fL PIPE 503 • • • • • , ,a PLAN 561 0 5" CC. 51 4" 504 0 12" (TYP.) (PLACE TO WITHIN 3" OF CYLINDRICAL JPEN(NG) 503 502 0 5" CC. -- THROUGH PIPE ONE LATERAL Computer File Information Creat'on Date 07/31/2019 Last Modified Date 07/31/2019 FIJI Path Drawing He Name: AutoCAD Version: 2018 Scale AS NOTED Units English Index of Revisions Comments WELD COUNTY . r I , Alb 9-401 5'-4" SECTION A -A (STEEL IN BOTTOM OF BASE) CLASS B CONCRETE TO BE USED FOR CHANNELIZATION PUBLIC WORKS DEPARTMENT 1111H STREET P.O. BOX 758 GREELEY CO. 80632-0758 PHONE. (970) 356-4000 FAX (970) 304-6497 ANGLED LATERALS GENERAL NOTES 1. SINCE ALL PIPE ENTRIES INTO THE BASE ARE VARIABLE, THE DIMENSIONS SHOWN ARE TYPICAL. ACTUAL DIMENSIONS AND QUANTITIES FOR CONCRETE AND REINFORCEMENT SHALL BE AS REQUIRED IN THE WORK. 2. THE PRECAST FLAT TOP MAY BE USED ON ANY MANHOLE. THE ECCENTRIC CONE MAY BE USED WHEN THE MANHOLE "H" HEIGHT IS AT LEAST 8 FT. 3. THE MANHOLE RING FRAME SHALL BE SET IN A BED OF GROUT. THE FRAME SHALL BE SURROUNDED WITH A CEMENT GROUT IN UNPAVED AREA, OR A CONCRETE COLLAR IN PAVED AREA. SEE DETAILS ON SHEETS 2 AND 3. 4. DESIGN OF BOX BASE IS BASED ON STRAIGHT RUNS OF PIPE OR CHANGE IN DIRECTION OF LESS THAN 45°. SPECIAL DESIGN IS REQUIRED FOR 45° OR GREATER. 5. PRECAST MANHOLES AND REINFORCEMENT SHALL CONFORM '0 AASHTO M 199 (ASTM C 478). 6. CAST -IN -PLACE MANHOLES SHALL BE CLASS B CONCRETE. 7. STEPS SHALL BE REQUIRED WHEN THE MANHOLE DEPTH EXCEEDS 3 FT. -6 IN. AND SHALL CONFORM TO AASHTO M 199. 8. ALL REINFORCING STEEL SHALL BE GRADE 60 AND EPDXY COATED. VERTICAL STEEL SHALL BE PLACED AT CENTERLINE OF WALL. ALL BARS SHALL HAVE A 2 1N. MINIMUM CLEARANCE. 9. ALL PIPE ENTRIES INTO THE BASE OF MANHOLE SHALL BE CONNECTED BY OPEN CHANNELIZATIDN ADJUSTED FOR PIPE SIZE, SHAPE, SLOPE, AND DIRECTION OF FLOW DETAILS SHOWN ARE TYPICAL FOR INSTALLATIONS WITH ALL INVERTS OF SAME RELATIVE ELEVATION. FOR EXCESSIVE ELEVATION DIFFERENCE BETWEEN INVERTS, SPECIAL BASE/CHANNEL DETAILS WILL BE SHOWN ON THE PLANS. 10. FLOW CHANNELS AND INVERTS SHALL BE FORMED BY SHAPING WITH CLASS B CONCRETE OR APPROVED GROUT. II. STUB -OUTS SHALL EXTEND 7 FT, MINIMUM BEYOND DUTSID WAL SURFACE Of YAM-EkE AND BE SATISFACTORILY °LUGGED. 12. THE SLOPE OF THE MANHOLE COVER SHALL MATCH THE ROADWAY PROFILE AND CROSS SLOPE. • WHEN FINAL GRADE IS PAVEMENT SURFACE, RECESS MANHOLE RING AND COVER 1/4" MIN. TO I/2" MAX. REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-20 (SHEET 1 OF 3) REFER TO THE LATEST M & S STANDARDS. TYPICAL CHANNELIZATION DETAILS As Constructed No Revisions Revised Void Designer CDOT Detailer CURVED DEFLECTOR - REQUIRED SHARP ANGLE MANHOLES Sheet Subset Sheet Subset: 1 of 3 Fr..^w *nut,: below. Call before you ."ig Project No./Code Sneet Number of TOE POCKETS AT 16" Q.C. IF TOP -e� FLEXIBLE OF BENCH Z 18" ABOVE INVERT 48" MIN. 19" MIN. CLASS B CONCRETE. JOINT SEAL ,� SHALL CONFORM MANHOLE RISER ft TO AASHTO M 198 3" �- ''s 9' 3" MIN. ----REINFORCING CONFORMING TO ASTU C 47� . (TYP.) MIN. M IN. _ H co m I.D-/4 CLASS B - ° � ° � 1 (� . • • t/2" Dr- • " CONCRETE BASE o �� N ^ +` t/2" U � �► •W SLOPE �i►. 1 •o �i r .. . ' A • `P v + 'c$ 0000000 14 U 0 12" % a SEE TYP. TIE BAR O 0 0 0 0 0 0/ 14 • 12" • o . > 6" ' f� • 0000ao ` ALL BASES �4:1 MIN. - ` ° o 0 0 0 00� 1" a .,� • �� 114 00000--/ / 0 12", EACH WAY . 1� 3 , • 0 0 O .. -tom r ^ ��C • • SLOT ►••8u r ..� o �-3" CLEAR t I MIN. L 4 II L 6" MIN. ' " i i MANHOLE RISER 0.0.+ 6 INCHES MANHOLE RING MID COVER � "� 6" 26" (RIM ELEVATION) pi r�_ �� SECTION B -B MIN.SECTION 24 i D -D • FINAL GRADE -; /VA'S'' XICW' 8I" IN UNPAVED AREA USE CEMENT GROUT 24"i S GRADE RINGS OR BRICK COURSES • • • . • . . • • •. '� L �� BASE MAY BE j .•34 POURED SQUARE ON AT CTRACTORS PRECAST MANHOLE .�� • 6„ ~ TOTAL WEIGHT: APPROXIMATELY 400 LBS. SHALL BE GRAY OR DUCTILE CAST ' OPTION. E SECTIONS •• • IRON IN ACCORDANCE WITH : • • S. . SUBSECTION 712.06. S. • , `-- e -m`'' • WHEN FINAL GRADE IS PAVEMENT SURFACE, RECESS MANHOLE RING .• SECTION A -A AND COVER ! •_ it t" t �� MIN. T �' I o /z° M g • g FLAT TOP SECTION DETAIL MANHOLE RING AND COVER BENCH ,'' Lis IST MANHOLE RING AND COVER '}' BENCH • • SEE SHEET 3 FOR CONCRETE FINAL GRADE r 811 o I i I COLLAR DETAILS . . STE' 1 . + 1 � °4 '� • ' --- GRADE RINGS OR • • •`••• BRICK COURSES r.:.c. below. "" -a-{ e •' Callall be bo?N io4 cig , l�-0" '. r 24" -_ PRECAST FLAT TOP —+,'• 8" ."• •' • LEGEND TYPICAL �rw 18" � '�,. �. �6" • 4 D[A. MANHOLE RISER SECTIONS -•• VARIES �• TIE BAR • �. . 12" MIN. .SC(KSS$ 4 SUITABLE SUBGRAOE PRECAST FLAT TOP �,, ";:r ."' ;:'� GRANULAR � BEDDING MATERIAL E 8" PLAN FLEXIBLE JD[NT J Cj PLAN SEAL CONFORMING , • • - CONCRETE TO AASHTO M 198 MANHOLE I.D. (TYP.) ..f. S' TO 8' DIA. ' .,; 16" REFERENCE: • 1 MAX. COLORADO DEPARTMENT STANDARD FLOW OF TRANSPORTATION �' W - •' M-604-20 \ 6'_6 (SHEET 2 OF 3) REFER TO THE LATEST M & S STANDARDS. FLOW FLOW '� • �. > MIN. �- MANHOLE --- PRECAST MANHOLE BASES NOTES: STEPS •• •�� A a v. 1. THE BASE SLAB SHALL BE POURED MONOLITHICALLY WITH �� BOTTOM RISER SECTION. • • INVERT ELEVATION v V INVERT ELEVATION • •. • . • . - , • . • . • . • . , ‘V\ \ \\, , , . t�--�• SHOWN IN PROFILE SHOWN IN PROFILE INVERT ELEVATION ' . 2. PRECAST MANHOLE BASES SHALL FIT THE CONDITIONS AM LOCATIONS FOR WHICH SHOWN IN PROFILE .:s:P ;,, ; .. ;; t.s;. , .w� :' .s:?.•;: .- =' INVERT ELEVATION SHOWN IN PROFILE . THEY PRE INTENDED WITHOUT ANY FIELD MODIFICATIONS. ANY MANHOLE BASE SECTION C -C FLOW CHANNEL WHICH REQUIRES FIELD CUTTING OR MODWICATION IN ORDER THE w ww .' �_�• TO FIT LOCATIONS ` • .. INTENDED WILL BE REJECTED BY THE ENGINEER AND REMOVED AND REPLACED BY CAST -IN -PLACE SLAB BASE SECTION E -E THE CONTRACTOR AT NO COST TO THE DEPARTMENT. PRECAST SLAB BASE It�- - \.\\\ 3. AN MANHOLE BASES SHALL BE BEDDED ON APPROVED GRANULAR BEDDING MATERIAL AS SHOWN ABOVE. MANHOLE RISER DETAIL Computer File Information Index of Revisions WELD COUNTY As Constructed Project No./Code MANHOLES Greaten Date 07/31/2019 Date Comments. Initials No Revisions Last Modifier: Date 07/31/2019 `' '1•' PUBLIC WORKS DEPARTMENT 1111 H. STREET F II Path. ) t 1 r • % P.O. BOX 758 Revised Designer 9 CDOT Drawing Fie Name: • il,P.; /' j GREELEY. CO. 80632-0758 PHONE: (970) 356-4000 Detader: CDOT Voea Snee! Number of AutoCAD Version* 2018 Scale AS NOTED Un is English FAX (970) 304-6497 Sheet Subset. t 2 of 3 Snec, Souse+ WHEN ADJUSTMENT HEIGHT IS 3 IN. OR LESS, METAL ADJUSTMENT RINGS COMPATIBLE WITH THE EXISTING MANHOLE RING F AND COVER MAY BE USED IF APPROVED BY THE ENGINEER. -WA 'AVEMENT HMA PAVEMENT CONCRETE COLLAR OR FULL DEPTH HMA PATCHING SHALL BE IN ACCORDANCE WITH SECTIONS 403 OR 412 BRICK COURSES 2 MIN., 4 MAX. OR PRECAST CONCRETE GRADE RINGS OR ADJUSTABLE METAL RINGS t I 12" a a • •r 24" • N 00 ❑00 0000 00000 00000 OOOOO aGear ' 00000 00000 00000 0000 000 00 • SLOPE t/4" MIN.- %y" MAX. O .. O O O O 000410 O 00000 000000 0000000 ❑nnnnon reaaaaa •000000 0000000 0000000 O 00000 00000 O 000 Co.. CEMENT MORTAR • F Y t/4" RECESS • • a • h • • SECTION F -F ADJUST MANHOLE 20 IN. OR LESS O • s • REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-604-20 (SHEET 3 OF 3) REFER TO THE LATEST M & S STANDARDS. • MORTAR THICKNESS MAY BE NONSYMMETRICAL TO MATCH CROSS SLOPE OF ROADWAY. 12" SLOPE I/4" MIN.- ;72" MAX. CONCRETE COLLAR OR FULL DEPTH HMA PATCHING BRICK COURSES, 2 MIN., 4 MAX. OR PRECAS I CONCRETE GRADE RINGS PRECAST RISER SECTION c a I/4" RECESS /I/I I'.1" a 3' a A GREATER THAN 20 IN. • SECTION F -F a• • I. • t RESET ECCENTRIC CONE. WORK WILL NOT BE MEASURED AND PAID FOR SEPARATELY, BUT SHALL BE INCLUDED IN THE WORK MODIFY MANHOLE GREATER THAN 20 IN. Computer File Information Creation Date 07/31/2019 Last Modified Date 07/31/2019 Full Path Drawing Fie Name: Au oCAD Verson 2018 Scale AS NOTED Un:ts English Index of Revisions Date Comments Initials T -BASE MANHOLES NOTES 1. THE T -BASE SECTION SHALL BE SHOP -FABRICATED FOR DELIVERY TO THE CONSTRUCTION SITE AS A COMPLETE UNIT. 2. THESE DETAILS SHOW ONLY THE CONCEPTUAL AND STANDARD DIMENSIONAL REQUIREMENTS FOR TYPE T -BASE MANHOLES. THE CONTRACTOR SHALL FURNISH DETAILED SHOP DRAWINGS FOR APPROVAL PRIOR TO FABRICATION. THE DETAILS SHOWN HEREIN APPLY ONLY TO 48 IN. AND GREATER DIAMETER PIPES. 3. EXCEPT FOR CLASS OF PIPE, SPECIFICATIONS FOR THE MANHOLE SHALL BE THE SAME AS THOSE REQUIRED FOR THE ADJOINING PIPE. 4. THE T -BASE SECTION SHALL MAINTAIN ITS INTERNAL SHAPE AND FLOW AREA. GROUTING OR FILLING SHALL BE APPLIED SO AS TO NOT DISTURB THE NORMAL FLOW OR REDUCE THE AREA. • WHEN FINAL GRADE IS PAVEMENT SURFACE, RECESS MANHOLE RING AND COVER t/4" MIN. TO t/2" MAX. I i � 1 L 14 CIRCULAR RIGID PIPE (LONGITUDINAL SECTION) WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY, CO. 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 MANHOLE RING AND COVER GRADE RINGS OR BRICK COURSES 12" MIN. - 16" MAX. FLEXIBLE JOINT SEAL CONFORMING TO AASHTO Al 198 (TIP.) MANHOLE T -BASE As Constructed No RevIsions Revised Void T -BASE SECTION - FINAL GRADE • 4' DIA PRECAST FLAT TOP WITH 24" ECCENTRIC OPENING STANDARD. 4' DIA MANHOLE RISER SIC IIUNS JOINT DETAIL TO BE APPROVED PRIOR TO FABRICATION CIRCULAR RIGID PIPE (TRANSVERSE SECTION) Know venal i beluw. Call before roi = a MANHOLES Designer CDOT Detailer CDOT Sheet Subset Sheet Subset: 3 of 3 Project No./Code Sheet Number of OUTLET REQUIREMENTS WQCV SHALL BE RELEASED OVER 40 HOURS OUTLET WORKS SHOULD BE SIZED AND STRUCTURALLY DESIGNED TO RELEASE AT NO MORE THAN THE 1 -HOUR, 5 -YEAR HISTORIC RELEASE RATE IN URBANIZING AREAS AND THE 1 -HOUR, 10 -YEAR HISTORIC RELEASE RATE IN NON -URBANIZING AREAS. OPENINGS IN THE SAFETY GRATE SHALL ALLOW ENOUGH FLOW TO PASS THE 5 -YEAR OR 10 -YEAR HISTORIC FLOW (DEPENDENT ON URBANIZATION CLASSIFICATION), USING A 50% CLOGGING FACTOR. • STEEL FOR GRATES AND GRATE INSTALLATION HARDWARE SHALL BE GALVANIZED AND CONSTRUCTED IN ACCORDANCE WITH CDOT SECTION 712.06. • CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS, PER CDOT SPECIFICATION SECTION 601. REINFORCEMENT BARS SHALL BE PER CDOT SPECIFICATIONS. SPACING AND SIZE TO BE DETERMINED BY CONSULTING DESIGN ENGINEER. - STEPS SHALL BE PROVIDED WHEN HEIGHT IS GREATER THAN 3'-6" AND SHALL CONFORM TO AASHTO M 199. OUTLET STRUCTURE SAFETY GRATE f OUTLET PIPE I 12" MIN. RESTRICTOR ORIFICE PLATE WATER QUALITY PLATE A' WQCV ORIFICE PLATE (HOT -DIPPED GALVANIZED STEEL) PLAN VIEW iii;-lli :1IIi,, III SECTION A -A' SAFETY GRATE WQCV WSEL WQCV ORIFICE PLATE m HOT -DIPPED GALVANIZED STEEL I \siI a Ws • WOCV WSEL 100 -YEAR RESTRICTOR ORIFICE PLATE PLATE (3/8" MIN. HOT -DIPPED GALVANIZED) OUTLET PIPE 12" MIN. 100 -YEAR RESTRICTOR ORIFICE PLATE PLATE (3/8' MIN. HOT -DIPPED GALVANIZED) OUTLET PIPE 12" MIN. /\//• \//\ /\/ Computer File Information Creation Date Last Modif:ed Date. 11/12/2020 Full Data Drawing F,le Name AutoCAJ Version 2018 Scale AS NOTED Units. English SECTION B -B' Index of Revisions Date Comments. Iri;i�a5 EMERGENCY SPILLWAY V MINIMUM 3' WQCV WSEL WOCV ORIFICE PLATE MAXIMUM SLOPE OF 4:1 I--5'-al OVERTOPPING SPILLWAY WATER SURFACE 100 YEAR WSEL SAFETY GRATE CONCRETE CUTOFF WALL EMERGENCY SPILLWAY REQUIREMENTS 100 YEAR WSEL OR HIGHER VARIES - 6" MAX FRONT VIEW 8" MINIMUM THICKNESS OUTLET PIPE MINIMUM SIZE 12" CONCRETE CUTOFF WALL SIDE VIEW 6" MAXIMUM FLOW OVER SPILLWAY — 1' MINIMUM Know what's below. Call before you mg. TWO #5 BARS COMPACTED EARTH 95% STANDARD PROCTOR DENSITY BURIED OR GROUTED RIPRAP (DEPTH = 2 x D,o) PLACED TO TOE OF SLOPE GEOTEXTILE FABRIC MIRAFI FW 300 OR APPROVED EQUAL LOW TAILWATER BASIN IF VELOCITY EXCEEDS 2 FPS HEADWALL AT END OF PIPE ▪ EACH DETENTION POND SHALL CONTAIN AN EMERGENCY SPILLWAY CAPABLE OF CONVEYING THE PEAK 100 -YEAR STORM AT A DEPTH OF SIX (6) INCHES OR LESS. BURIED OR GROUTED RIPRAP SHALL BE PLACED FORM THE EMERGENCY SPILLWAY DOWNHILL TO THE EMBANKMENT TOE OF SLOPE AND COVERED WITH SIX (6) INCHES OF TOPSOIL, IF BURIED. THE RIPRAP MUST BE SIZED AT THE TIME OF FINAL ENGINEERING DESIGN. GROUTING OF THE RIPRAP MAY BE REQUIRED. ▪ IN ORDER TO PREVENT DAMAGE TO PUBLICLY -OWNED INFRASTRUCTURE (ROADS. ROADSIDE DITCHES), A CONCRETE CUTOFF WALL EIGHT (8) INCHES THICK, THREE (3) FEET DEEP, AND EXTENDING A MINIMUM OF FIVE (5) FEET INTO THE EMBANKMENT ON EACH SIDE OF THE SPILLWAY OPENING IS REQUIRED ON ALL DETENTION PONDS. THE EMERGENCY SPILLWAY ELEVATION MUST BE TIED BACK INTO THE TOP OF THE EMBANKMENT USING A MAXIMUM SLOPE OF 4:1. • CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS. PER CDOT SPECIFICATION SECTION 601. WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY, CO. 80632-0758 PHONE. (970) 356-4000 FAX: (970) 304-6497 As Constructed No Revisions Revised: Void: OUTLET AND SPILLWAY DETAILS Project No./Code Designer Detailer Sheet Subset Sheet Subset. Sheet Number of t t,A E PLAN to - C --•1 L PIPE We DIMENSIONS A C L E IN. 18 10 48 78 36 24 10 48 78 48 30 14 36 96 60 36 18 36 96 72 42 24 36 96 78 48 28 24 96 84 54 30 36 96 90 60 36 36 96 96 72 34 20 _ 96 108 REINFORCED CONCRETE CIRCULAR PIPE E SECTION X -X END VIEW X �►X END SECTION FOR REINFORCED CONCRETE CIRCULAR PIPE COLORADO DEPARTMENT OF TRANSPORTATION STANDARD M-603-10. REFER TO LATEST M&S STANDARDS. REFER TO M-603-10 FOR ELLIPTICAL PIPES. D OR 7 MIN 3 MIN NOTE: TOEWALL SHALL BE 4,500 PSI CLASS D CONCRETE WITH 8 -INCH THICKNESS. TOEWALL REINFORCEMENT SHALL BE DESIGNED BY THE ENGINEER OR CONTRACTOR FOR APPROVAL BY THE COUNTY. Computer File Information Creaton Date 12/14/2020 Last Vodka Date FJI Path Drawing Fie Name: AutoCAD Verson: 2018 Scale AS NOTED Units English D OR 2' MIN TOEWALL NTS Index of Revisions Comments WELD COUNTY tee) •N -t EXTEND RIPRAP TO HEIGHT OF PIPE OR BOX, MIN. RIPRAP MORE THAN 1.0' ABOVE PIPE INVERT SHALL BE INSTALLED 6" BELOW FINISHED GRADE AND BURIED WITH TOPSOIL FINISHED GRADE TOE WALL - 8" THICKNESS S MINIMUM DEPTH GEOTEXTILE EROSION CONTROL. MIRAFI 300 OR EQUAL PUBLIC WORKS DEPARTMENT 1111 H. STREET P O. BOX 758 GREELEY CO 80632-0758 PHONE (970) 356-4000 FAX (970) 304-6497 PLAN NTS END TREATMENT MAY CONSIST OF RCP END SECTION (WITH TOEWALL) OR HEADWALL As Constructed Revised Void Sheet Number of L 2D50 MIN SOIL RIPRAP OR VOID -FILLED RIPRAP PROFILE NTS RIPRAP APRON DETAIL Designer Detailer Sheol Subset: Sheet Sunset Know what's below. Call before you dig. Project No./Code EDGE OF DRIVING SURFACE (FLOWLINE) 40' NOTE: 1. ROADS SHALL NOT HAVE VISIBLE IMPEDIMENTS BETWEEN 3 FEET AND 8 FEET IN HEIGHT AT SUBDIVISION INTERSECTIONS WITHIN A TRIANGULAR AREA AS SHOWN ABOVE. /POINT OF INTERSECTION EDGE OF DRIVING SURFACE (FLOWLINE) SUBDIVISION ROADS SIGHT DISTANCE NOTES: 1. DISTANCE 02 IS EQUAL TO DISTANCE a, PLUS THE WIDTH OF THE LANE(S) DEPARTING FROM THE INTERSECTION ON THE MAJOR ROAD TO THE RIGHT. 2. DISTANCE 02 ALSO SHOULD INCLUDE THE WIDTH OF ANY MEDIAN PRESENT ON THE MAJOR ROAD. 3. THE APPROPRIATE MEASUREMENT OF DISTANCE a, AND DISTANCE O2 FOR DEPARTURE SIGHT TRIANGLES DEPENDS ON THE PLACEMENT OF ANY MARKED STOP LINE THAT MAY BE PRESENT AND, THUS, MAY VARY WITH SITE -SPECIFIC CONDITIONS. IN WELD COUNTY, THE TYPICAL DISTANCE BEHIND THE TRAVELED WAY TO THE STOP BAR IS 14 FEET. 4. ADDITIONAL INFORMATION REGARDING SIGHT DISTANCE FOR INTERSECTIONS AND CASES OTHER THAN THE STOP CONTROL CONDITION CAN BE FOUND IN AASHTO'S A POLICY ON GEOMETRIC DESIGN OF HIGHWAYS AND STREETS. Computer File Information Creation Date Last Modified Date 11/12/2020 F III Path Drawing He Name: AutoCAD Verson 2018 Scale AS NOTED Units English Index of Revisions Date Comments It 11111IS L Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic Approaching the Minor Road from the Left Weld County Rd K 2 1t b Clear Sight Triangle —Decision Point Departure Sight Triangle for Viewing Traffic Approaching the Minor Road from the Right DEPARTURE SIGHT TRIANGLES INTERSECTION (STOP CONTROL) Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic -ocz 01 4 a2 a b Weld County Rd Clear Sight Triangle Decision Point Departure Sight Triangle for Viewing Traffic Apprcach ng the Access,Dnveway from the Lett Approaching the Access/Driveway from the Right WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY. CO. 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 DEPARTURE SIGHT TRIANGLES AT ACCESS (STOP CONTROL) Access Sight Distance b = 1.47 • V,,p, • t9 Vmap, = Design Speed of major rood (MPH) to = time gap needed for vehicle entering major road (sec) to = 7.5 Car, 9.5 Single —Unit Truck, 11.5 Combo —Unit Truck Adjust t9 for crossing more than 2 lanes: +0.5/extra Ione for cars +0.7/extra lane for trucks Also adjust to for starting grade of the vehicle if it exceeds 3% +0.2 sec/percent grade for cars and trucks (only for starting uphill) Krow wnat s below Call before you rig. As Constructed No Revisions Revised Void SIGHT TRIANGLES Designer Detailer Sheet Subset Sheet Subset: Project No./Code Sheet Number of EXISTING GROUND EXISTING GROUND Computer File Information Crea:on Date Last Modifiea Date 11/12/2020 * SHALL EXTEND FULL WIDTH OF INGRESS AND EGRESS OPERATION PLAN VIEW 70" MIN. 6" MIN. 10' MIRAFI FW300 GEOTEXTILE OR EQUIVALENT ELEVATION SECTION XISTING GROUND MIRAFI FW300 GEOTEXTILE OR EQUIVALENT SECTION B -B Index of Revisions Comments irihats EXISTING PAVEMENT OR GRAVEL ROAD (DEPTH VARIES) WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY, CO. 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 NOTES: Know what's below. Call before you d y 1. AGGREGATE SHALL CONFORM TO CDOT SPECIFICATIONS, SUBSECTION 208.02 (I) 2. THE CONTRACTOR SHALL PROTECT CURB AND GUTTER, EDGE OF PAVEMENT, OR EDGE OF GRAVEL ROAD THAT CROSSES OR IS ADAJACENT TO THE ENTRANCE FROM DAMAGE, WHILE NOT BLOCKING FLOW OF WATER. IN THE CASE THERE IS AN EXISTING DITCH, A CULVERT IS REQUIRED. PROTECTION OF THE ADJACENT ROADWAY MATERIALS MENTIONED ABOVE SHALL BE INCLUDED IN THE COST OF THE WORK AND NOT PAID FOR SEPARATELY. 3. ALL MATERIALS AND LABOR TO COMPLETE THE VEHICLE TRACKING PAD SHALL BE INCLUDED IN THE COST OF THE WORK AND NOT PAID FOR SEPARATELY. 4. THE PAY ITEM NUMBER FOR VEHICLE TRACKING PAD (EACH) IS CDOT STANDARD SPECIFICATION 208-00070. REFERENCE: COLORADO DEPARTMENT OF TRANSPORTATION STANDARD is ring 1, R0TH 'wolf -trill -Innis - As Constructed No Revisions Revised Designer Detailer Sheet Subset Sheet Subset Project No./Code Knorr what's below. Call before you dig. 24" MIN. Computer File Information Creation Date Last Modified Date 11/12/2020 F..li Path Drawing He Name: AutoCAD Version: 2018 Scale AS NOTED Units Engiisn NEW ASPHALT SAW CUT AND REMOVE ASPHALT 2" DEPTH EXISTING ASPHALT /\/\/\/\/ / / vvvyv< \,\\,\\,\\,\\.\\,\\.\\\\\\\\\\\,\\\ < SAW CUT OR OTHER METHOD AS APPROVED SAW CUT ASPHALT OR "T -JOINT" DETAIL NOTES: 1. PAINT THE EDGE WITH DILUTED EMULSIFIED ASPHALT (SLOW SETTING) PRIOR TO PAVING OPERATION. APPLY TACK (CSS-1h) TO THE MILLED OR SAW -CUT EDGE PRIOR TO PAVING OPERATIONS. 2. RATE OF APPLICATION SHALL BE AS DETERMINED BY THE ENGINEER AT THE TIME OF APPLICATION. CSS-1h SHALL BE APPLIED AT 0.10 GAL/SY. A DIFFERENT APPLICATION RATE SHALL BE APPROVED BY WELD COUNTY. Index of Revisions Initials WELD COUNTY PUBLIC WORKS DEPARTMENT 1111 H. STREET P.O. BOX 758 GREELEY. CO. 80632-0758 PHONE: (970) 356-4000 FAX (970) 304-6497 As Constructed No Revisions SAW CUT ASPHALT OR "T -JOINT" DETAIL Designer Detailer Sheet Subset Sheet Subset: Project No./Code Sheet Number of Hello