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Home My WebLink About20173262.tiffPLANNED UNIT DEVELOPMENT {PUD} CHANGE OF ZONE APPLICATION FOR PLANNING DEPARTMENT USE RECEIPT/AMOUNT # 1$ APPLICATION RECEIVED BY DATE RECEIVED: CASE ## ASSIGNED: PLANNER ASSIGNED: Parcel Number: 1311 05 100007 Legal Description: Part of Lot B Recorded Exemption 4884 being part of the E2 NE4 Section b, Town ship 2, Range 67 West of the 6th PM., Weld County, Colorado Property Address: N/A Existing Zone District: Agricultural Proposed Zone District: PUD Proposed #/Lots: 4 Average Lot Size: 2.7 Proposed Subdivision Name: Silver Mountain Estates Proposed Area (Acres) Open Space: 0 Are you applying for Conceptual of Specific Guide?: Specific FEE OWNER(S) OF THE PROPERTY: Name: Phone#: Address: Richard L. Hein 303-304-0265 PO. Box 649 Fort Lupton, CO 80621 APPLICANT OR AUTHORIZED AGENT Name: Phone#: Address: UTILITIES: DISTRICTS: Sheri Lockman, Lockman Land Consulting, LLD 970-381-0526 Email Address: 36509 CR 41 Eaton, CO 80615 Water: Sewer: Gas: Electric: Phone: School: Fire: Post: Total Acreage: 10.87 acres Minimum Lot Size: 2.08 sherilockman@what-wire.com Central Weld County Water District Septic Propane United Power Cell Gilcrest School District RE1 Mountain View Fire District Longmont I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our)knowledge. Signatures of all fee owners of property must sign this application. If an Authorized Agent signs, a letter of authorization from all fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be included indicating the signatory has the legal authority to sign for the corporation. I (we), the undersigned, hereby request hearings before the Weld County Planning Commission and the Board of County Commissioners concerning the proposed Change of Zone for the above described unincorporated area of Weld County, Colorado: Richard L Hera Date COLORADO Sheri Lockman, I Lockman Land Consulting, LLC (Agent/Applicant) located at Part of Lot B RE -4884 DEPARTMENT OF PLANNING ERI E 1555 N 1 rs AVE GREELEY, CO 80631 PHONE: (970) 353-6100, Ext. 3540 PAX; (970) 304-6498 AUTHORIZATION FORM represent Richard L. Hein (Owner) for the property LEGAL DESCRIPTION: SEC 5 TWN RNG 67 SUBDIVISION NAME: Silver Mountain Estates LOT BLK I can be contacted at the following phone #' : Home Work 97O-381-0526 Fax # The property owner can be contacted at the following phone Wes Home Work 720-304-0265 Fax # Correspondence mailed to (only one): Agent/Applicant DATE g""' 3 e OWNER'S INATURE j [� Property Owner I Response to Concerns Mountain View Fire Rescue - No concerns were raised by Mountain View Fire Rescue. All required development standards pertaining to water supply, fire hydrant locations and street design will be met. Colorado Geologial Survey — At time of construction lot specific geotechnical investigations will be completed. Construction of foundations and basements will follow the recommendations made in the geotechriical reports. Weld County Department of Public Health and Environment - Individual Sewage Disposal System requirements have been met. The requested percolation tests have been completed and the new data has been included with this submittal. Town of Firestone — An access permit application will be submitted to the Town of Firestone upon approval of the Change of Zone by the Board of County Commissioners. The applicant is asking for a variance from paving the internal roadway. In the attached email dated December 6, 2016 David Lindsay, Town of Firestone Engineer, has indicated that they would prefer the application be submitted after road treatment has been decided. Ike further indicates that the Town does not have plans to pave Zinnia Avenue (County Road 26) and has no objection to a gravel roadway. Anadarko Land Corp./Kerr-McGee Gathering LLC — Please refer to the attached emails and referral response from Michael Kuledge. The emails show the ongoing discussion with Anadarko and Kerr- McGee. Mr Kuledge has requested a mutual acceptable land use agreement. The latest proposal asked Mr. Hein to waive all setback and notification requirements. We are willing to consider another proposal but do not believe that waiving all setback and notification requirements is reasonable. Weld County Department of Public Works a The plat will be labeled with the applicable access permit number if assigned by Firestone. Weld County Department of Planning Services _ Engineer - An updated Drainage Report has been included with this submittal. Weld County Department of Planning Services — Staff comments indicated that we should meet with the School District to discuss any requirements/concerns with the existing bus route and proposed development. Please see the attached email dated December 8, 2016 from Doug Moss, Chief Financial Officer for the Weld County RE -1 ch oo l District. The email indicates no additional concerns. Bob Choate, Assistant Weld County Attorney has reviewed the Can -Serve letter submitted with the Sketch Plan application. In an email dated December 13, 2016 Mr. Choate has indicated that the Can - Serve letter is adequate contingent on the construction of the line extension described. As indicated above, an access permit application will be submitted to the Town of Firestone upon approval of the Change of Zone by the Board of County Commissioners. Staff comments indicated that we should meet with the Longmont Postal Service, We first contacted Stanley Dymond with the Longmont Post Office on April 7, 2016. Please see the attached entails detailing the attempts to obtain the Postal Services input. The Postal Service is obviously not willing to review the layout. In a phone conversation with the rural carrier she indicated that a group mailbox would not be necessary. They would allow four separate boxes to be placed along County Road 26. She indicated that she would send me an email to let me know if the boxes should be placed on the north or south side of the County Road. No email was ever received. DEVELOPMENT GUIDE Sec. 27-6-40. Component One — environmental impacts, 1. Noise and vibration. The subdivision will maintain compliance with noise and vibration levels as permitted in Section 4-9-40 of the Weld County Code. 2. Smoke, dust and odors. The site will maintain smoke, dust and odor levels in compliance with levels allowed by the Colorado Air Quality Control Regulations. 3. Heat, light and glare. The proposed lots will maintain heat, light and glare levels below the maximum permissible levels as described in Section 23 of the Weld County Code. Outdoor lighting shall be arranged to deflect light away from any properties and from County road. 4. Visual/aesthetic impacts. The residential and agricultural land uses in the surrounding area will be very similar to the residential uses being proposed. 5. Electrical interference. The subdivision will not create any electrical interference. 6. Water pollution. The site will be designed and graded to meet all applicable Federal, State and County water quality regulations. 7. Wastewater disposal. All wastewater will be disposed of through septic systems which have been properly permitted in accordance with State and county regulations. 8. Wetland removal. There are no wetlands on this site. 9. Erosion and sedimentation. The site will be designed and graded with a storm water pond to capture any sedimentation. Further, the grading permit will include erosion and sedimentation controls. 10. Excavating; filling and grading. Grading permits will be acquired prior to excavating, filling or grading on the property. 11. Drilling, ditching and dredging. Any drilling, ditching or dredging done within the subdivision will be conducted according to applicable regulations and all required permits will be obtained. 12. Air pollution. All applicable air quality regulations will be maintained. 13. Solid waste. No solid wastes will be located on this site unless appropriately permitted. 14. Wildlife removal. The site is currently farmed which limits its use by wildlife. 15. Natural vegetation removal. The site is currently farmed therefore no natural vegetation will be removed. 16. Radiation/radioactive material. There will be no radioactive materials within the subdivision, 17. Drinking water source. The site will be serviced by Central Weld County Water District, 18. Traffic impacts. The applicant is requesting to use the Rural Local Unpaved specifications as shown in Appendix 24-E of the Weld County Code. The interior road shall be maintained by the Silver Mountain Estates HOA. The applicant will apply for an access permit from the Town of Firestone and meet all permit requirements. In the attached email from David Lindsay, Town of Firestone Engineer, Mr. Lindsay indicates that the Town does not object to the private drive being a gravel roadway. Sec. 27-6-50. Component Two — service provision impacts. 1. Schools. Gilcrest School District RE -1 has requested $1,054.20 per lot to mitigate impacts to the school District. The fee will be paid prior to recording the final plat. 2. Law Enforcement. The four lots proposed will have a minimal impact. Signs and addresses will be adequately posted to ensure emergency responders will have no difficulty in locating homes. Any additional concerns raised by the Weld County Sheriffs Office will be addressed as conditions of approval. 3. Fire Protection. The applicant have spoken to LuAnn Penfold, Fire Marshal, with Mountain View Fire Protection District to ensure that all District concerns have been or will be adequately addressed, 4. Ambulance. The four lots proposed will have a minimal impact. Signs and addresses will be adequately posted to ensure emergency responders will have no difficulty in locating homes. Any additional concerns raised by ambulance services will be addressed as conditions of approval. 6. Transportation (including circulation and roadways). Silver Mountain Estates is accessed from County Road 26 which is maintained by the Town of Firestone. The interior road shall follow Rural Local Unpaved specifications as shown in Appendix 24-E of the Weld County Code. The cul-de-sac will have an adequate turning radius for emergency vehicles and school buses. 6. A traffic impact analysis prepared by a registered professional engineer. A traffic impact study has not been required by Weld County or the Town of Firestone because of the minimal impact from a four lot residential subdivision, An access permit will be obtained from the Town of Firestone. 7. Storm drainage. See attached Drainage Report prepared by Al le s Taylor and Duke, dated March 2017. 8. Utility provisions. The utilities providers for Silver Mountain Estates are as follows: Gas: Propane Electric: United Power Phone: Cell See attached Will Serve Letter 9. Water provisions. Silver Mountain Estates will be serviced by Central Weld County Water District. The attached email from Bob Choate, Assistant Weld County Attorney, indicates that a will -serve letter has been submitted and approved by the Weld County Attorney's Office. 10. Sewage disposal provisions. The residences will be attached to septic systems which will be appropriately permitted through Weld County Environmental Health. 11. Structural Road Improvements Plan. Silver Mountain Estates accesses onto County Road 26 which is maintained by the Town of Firestone. An access permit will be obtained from the Town. Sec. 27-6-60. Component Three — landscaping elements. 1. Landscape plan. No landscaping is proposed. 2. Proposed treatment, buffering or screening' No buffering or screening will be necessary to achieve compatibility within the development or with the surrounding properties. 3. Maintenance schedule for landscaping. No landscaping is being proposed. 4. On -site improvements agreement. An improvements agreement will be entered into at the final plan stage. 5. Evidence of adequate water. Residential water taps from Central Weld County Water District will service the homes. The taps and line extension will be purchased at the final plan stage. Sec. 27-6-70. Component Four — site design. 1. Unique site features. No unique natural features exist on the site. The property naturally slopes from the south to the north. A sedimentation pond and a retention pond will be located at the north side of the property. 2. PUD rezoning is consistent with the goals and policies of Chapter 22 of the Weld County Code. Section 2-2-120.A. R.Goal 1. states, "Ensure that adequate services and facilities are currently available or reasonably obtainable to serve the residential development or district." The applicant has submitted evidence that a l l services including water, septic, roadways, drainage, utilities and public services can adequately service the subdivision. Section 22-2-120. C. R.Goal 3. states 'Consider the compatibility with surrounding land uses, natural site features, nearby municipalities' comprehensive plains and genera/ residential growth trends when evaluating new residential development proposals." The applicants proposed use is very similar to those on the surrounding properties. Further, the applicant has worked with the Town of Firestone to ensure that the proposed residential lots is consistent with their plans. 3. Compatibility with the PUD Zone District. The subdivision will follow the uses allowed by right, accessory uses, uses by special review and bulk requirements of the Estates Zone District, 4. Compatibility with the surrounding land uses. Silver Mountain Estates is surrounded by agricultural and large lot residential properties. These property uses are very similar to what is being proposed in this Change of Zone. The Lupton Meadows Ditch lies adjacent to the site. Please refer to the attached emails is between the applicant's representative and Howard (Gorky) Cantrell, Secretary for the Lupton Meadows Ditch. The property owner has agreed to include the statement "Lupton Meadows shall have the ability to operate and maintain the ditch with no encroachment allowed within the Prescriptive Easement". 5. Overlay Districts. The property does not lie within any overlay districts. Sec, 27-6-80. Component Five — common open space usage. Common open space. Because of the large lot size and small number of lots being proposed the applicant is not proposing any recreational common open space. 2. Establishment of Homeowner's Organization. A Homeowner's Association shall be established prior to recording the P U D Final Plat. 3, Mandatory membership. All lot owners will be part of the Homeowner's Association and shall be subject to the Silver Mountain Estate Covenants. 4. HOA responsibilities. Silver Mountain Estate Covenants ensure that the organization will be responsible for any required liability insurance, taxes and maintenance of interior road. 5. HOA powers. Covenants guarantee that homeowners can be held liable for the cost of operating and maintaining common facilities thru levy assessments. 6. Failure to maintain common open space. No common open space is proposed. 7. Common open space allocation. %15 common open space has not been designated in Silver Mountain Estates. Given the large lot size, and location of the subdivision Silver Mountain Estates should not be subject to the common open space requirement, Sec. 27-6a90. Component Six — signage. No development sign is being proposed. Any additional signage within the PUD will be in compliance with the Estate zone district as described by the Weld County code. Sec. 27-6-100. Component Seven — RUA impact. Silver Mountain Estates does not lie within an area designated a RUA Sec. 27'1/26-110. Component Eight — intergovernmental agreement impacts. Silver Mountain Estates lies within Mead and Firestone intergovernmental agreement areas. In the attached email dated 8/16/2016 Dawn Adams, Assistant Town Manager indicated that the Town of Mead would not oppose any development at this location. The Town of Firestone has requested that the applicant obtain an access permit upon acceptance of the road design by Weld County. Show Full Headers I Print I Close Printer View From: Dawn Adams <dadam.s@to nofm ac .org To: "sherd fockman@what-wire. corn'' <sherilockman@what-wire.corn > Subject: Property at CR 26 and CR. 17 Date: Tue 08/16/16 03:17 PM Thank you for your inquiry regarding CR 26 and CR 17. Thisproperty is south westMead's of cad s Growth Area. Mead would not oppose any development in the County at this location. I have attached a map of Meat's growth area for your convenience, Sincerely/ Dawn M. Adams Assistant Town Manager/Economic Developer Town of Mead 970-535-4477 Attachment: Soya View Name: Mead_ComPlan_11 17_102913. pdi: Type: : application/pdf Weld County Treasurer Statement of Taxes Due Account Number R6777967 Parcel B1105100007 Assessed To HEIN RICHARD L PO BOX 649 FORT LUPTON, CO 80621-0649 Legal Description PT E2NE4 5-2-67 PT LOT B RE -4884 LYING N OF LUPTON MEADOWS DITCH BEG NE CGtt N89D41'W ' S0D21'W 367' $66D494E 66' S43D03'811 ]' S36D04'E 72' 85SD09'E 26' SS'7D33'E 84' S76D06`E 98' SSSD3 I'E 75' S44D44'E 138' $64D30'E 105' N82T52'E 30 -N36O19'E 50' N13D06'E 98' N33D02'E 60' N43D18'E 79' S70D12'E 19' NODD3'E 515' TPOB Situ Athtrrss Year Tax Interest Fees Tax 201_6 $ L55.88 $000 $0.00 $0.00 $155.82 Total Tax Charge r Grand Total Ion as of031 '2017 $155.88 $15188 Tax Billed at 2016 Rates for Tax Area 2264 - 2264 Authority WELD COUNTY SCHOOL MST RE1 NORTHERN COLORADO WATER (NC MOUNTAIN VIEW FIRE AIMS JUNIOR COLLEGE Ma PLAINS LIBRARY Taxes Billed 2016 * 'credit Levey !all Levy 15.80000}* 16.9560000 1.0000000 11.7470000 6.3080000 1.2710000 Amount Values $44.71 AG -FLOOD $47.IRRRIUATED LAID 99 $2.83 Total $33.24 $17.86 $9.25 55.0820000 $155.88 Actual Assessed $9,760 $2,830 $9,760 $2,830 ALL TAX LIEN SALE AMOUNTS ARE SUBJECT TO CHANGE DUE TO ENDORSEMENT OF CURRENT TAXES BY THE LIENHOLDER E R OR TO ADVERTISING AND DISTRAINT WARRANT FEES. CHANGES MAY OCCUR AND THE TREASURER'S OFFICE WILL NEED TO BE CONTACTED PRIOR TO REMITTANCE AFTER THE FOLLOWING DATES: PERSONAL PROPERTY AND MOBILE HOMES - AUGUST 1, REAL PROPERTY' - AUGUST 1. TAX LIEN SALE REDEMPTION AMOUNTS MUST BE PAID BY CASH OR CASHIERS CHECK. Weld County Treasurer • P.O. Box 458, Greeley CO 60632 41400 N 17th Ave, Greeley CO 60631 * (97'0) 353-3845 ext. 3290 Show Full Headers j Print Close Printer View From: David Lindsay <dlindsay@ccginc.us> To: "sheri lockman©what-wi repcorn csheri lockman©what-wi re. corms Cc: Rebecca Toberman <RTo rman@firestoneco.gov> Subject: RE: access permit Date: Tue 12/06/16 09:18 AM Good morning Sheri. The Town will need to issue the landowner an access permit prior to it being constructed. Our preference would be that you not submit the application until you know for certain what the surface treatment for the new private roadway will be. Zinnia Avenue is currently not paved and we do not have plans to pave it in the near future. The Town does not object to the private drive being a gravel roadway. The Town would like the landowner to dedicate the additional 20' of public ROW on the south side of Zinnia Avenue and on the west side of Ingalls Street to the Town of Firestone. This will allow us to widen the roadway in the future and install interim improvements as traffic conditions warrant. David B. Lindsay, PE President Colorado Civil Group, Inc, 5110 Granite Street, Unit D Loveland, Co 80538 970.278.0029 ext. 105 970.290.1092 (cell) From: sherilockman@what-wire.com [mailto:sheritockman@what-wire.coml Sent: Tuesday, December 06, 2016 8:55 AM To: David Lindsay <dlindsay@ccginc.us> Subject: access permit Mr Lindsay, Thank you for taking the time to discuss the access permit and road requirements for the four lot Planned Unit Development that we are proposing on the property at the southwest corner of County Roads 17 and 26. I understand that you do not have any issues with the road being constructed using gravel as County Road 26 is a gravel road, We will need to obtain a waiver from pavement from the Board of County Commissioners. Please respond to verify that you have no concerns with the access permit being completed at the final plan instead of the change of zone. Thanks again, 'Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Show _ Full Headers I Print I Chose Printer View From: "" <sherilockman@what--wire■com> To: "Kuledge, Michael" <Michael.Kuledge@anadarko.com> Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Date: Sat 12/03/ 16 03:03 PM Michael, I spoke to Mr. Hein on Thursday. He has asked me to handle any and all negotiations regarding the oil and gas interests on his property. I was hoping he would take your phone calls and tell you the same thing. I took a look at the waiver that you are asking Mr. Hein to sign. I do not believe that it is in Mr. Hein's best interest to waive all rights granted him by the Colorado Oil and Gas Conservation Commission. Please let us know if you have any additional requests and we will be happy to consider them. Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, CO 80615 970-381-0526 --- Michael.Kuledgeanadarko.com wrote: From: "Kuledge, Michael' <Michael.I uledge@anadarko.com> To: "sheri l ockman@what-wire.com" <sheri lockrnan©what-wi re. com > CC: "Ross, Katherine" cKatherine.Ross@anadarko,corms>, "Ratliff, Paul" <Paul.Ratliff@anadarko.com>f "Shoulders, Justin" <Justin. Shoulders@a nadarko.com >, "Ei lladeau, Jake" <lake.Billadeau anadarko.corn> Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Date: Fri, 2 Dec 2016 18:30:36 +0000 Good morning Sheri, Thank you for providing me with his phone number. Unfortunately that number seems to not be working with our attempts as well. Please find the attached Colorado Oil and Gas Conservation Commission waiver concerning setback requirements that would alleviate the concerns with Kerr-McGee's oil and gas interests, As A Kerr-McGee has the right to potential well site locations (drilling windows) within the vicinity of Mr. Hein's property. Anadarko requests that Mr. Hein review and if agreeable, sign the attached, waiving the setback and notifications required in the COGCC rules and regulations. There is also matter of the hard rock mineral resources owned by Anadarko Land Corp as indicated in the objection letter, Anadarko would like to personally discuss this matter with Mr. Hein along with other business relating to his 'holdings. If there is any way you can help facilitate reliable communication with Mr. Hein these matters could be worked through more quickly. 4 will await the plat when it is provided within the referral. Thank you and I look forward to Mr. Hem's and your response. Regards, Mike L Michael T. Kuledge CRS I Sr Landman 1099 18th Street, Denver CO 80202 (720) 929.3710 (Denver Direct) WAIVER For good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, this Waiver ("Waiver"), effective on , 201 , is made by Richard L. Hein(`Sut ace Owner"), with an address of 5290 E. Yale Circle, Suite 103, Denver, CO 80222. Surface Owner owns the surface estate of certain lands in Weld County, Colorado, generally described as part of Lot B Recorded Exemption 4884 being part of the E2 NE4 of Section 5, Township 2 North, Range 67 West, and more specifically described in the attached Exhibit 1 (which is incorporated into this waiver) and is herein referred to as the "Property." Kerr-McGee Oil & Gas Onshore LP ("Kerr-McGee") owns oil and gas interests in the N/2 of Section 5, Township 2 North, Range 67 West, Weld County, Colorado (the "Lands"), and has rights to drill wells and install production facilities on the Lands to develop its oil and gas interests. Surface Owner understands and acknowledges that rules and regulations of the Colorado oil and Gas Conservation Commission ("COGCC) govern the distance between a wellhead and public roads, production facilities,buildings, building units and surface property lines, among other things. To the fullest extent possible, Surface Owner and its successors and assigns hereby waive all setback and notification requirements in COGCC Rules 305, 306, 603 and 604 and any successor rules or amendments, including Exception Zone setbacks and any other state or local setback requirements or other laws, requirements or regulations that would prohibit or interfere with the rights of Ken -McGee and its successors and assigns to explore for and produce oil and gas from the Lands and to locate wells and production facilities anywhere on the Lands. Surface Owner further agrees not to object to the location of wells and production facilities on the Lands on the basis of setback requirements in the noted Co +C rules and regulations and any state or local setback requirement. Surface Owner and its successors and assigns acknowledge that Kerr-McGee and its successors and assigns may cite the waivers in this waiver in order to obtain exceptions and variances from the COGCC or from any other state or local body having jurisdiction over oil and gas operations. Surface Owner and its successors and assigns agree thatthis waive` satisfies any requirement for a waiver, consent to an exception or variance signed by the surface owner, Building Unit Owner (as that term is defined in the COGCC Rules and any successor rules or amendments), homeowner or the like and agrees that Ken -McGee ee and its successors and assigns may provide a copy of this waiver- to the COGCC or to any other state or local body in satisfaction of such requirement. In addition, Surface Owner and its successors and assigns, agree to execute and deliver to Kerr-McGee and its successor and assigns any additional consents and waivers requested, including waivers required from Building Unit Owners, homeowners and the like, required for the exploration and production of oil and gas from the Lands and the location of wells and production facilities on the Lands. In addition, Surface Owner shall provide notice to all buyers and assignees of an interest in the Property (or any portion thereof), including all builders, property owners, property owners' associations, and special districts (each, a "Future Owner") of the existence of this Waiver, In addition, Surface Owner will notify Future Owners that, as successors in interest to Surface Owner, Future Owners will be bound by this Waiver and will assume the obligations undertaken by Surface Owner pursuant to this Waiver, including but not limited to the waiver of all setbacks and the obl i ati on to provide notice to subsequent Future Owners. It is expressly understood and agreed by Surface Owner and Kerr-McGee ee that the waivers, notice requirements and the obligations assumed by Future Owners as set forth in this Waiver are, and shall be construed to be, covenants that run with the Property. As a condition to any sale or assignment of the Property (or any portion thereof) by Surface Owner and its successors and assigns, Surface Owner and its successors and assigns will require that the buyer or assignee provide to Kerr-McGee and its successors and assigns all waivers required in the preceding section of this Waiver. Kerr-McGee may record this Waiver in the Office of the Clerk and Recorder of Weld County. The undersigned has executed this Waiver on the date set forth below in the Acknowledgment. Surface Owner: Richard. L. Hein Signature Richard L. Hein. ACKNOWLEDGMENT STATE OF )ss COUNTY OF The foregoing instrument was acknowledged before me this day of by Richard L. Rein, as Surface Owner. Witness my hand and official seal. Notary Public My commission expires: 2 EXHIBIT 1 to Waiver, effective , 201_, by Richard L. Hein Decal Description That portion of Lot B of RE4884 lying North of the Lupton Meadows Ditch in the East % of the Northeast 1/ of Section 5, Township 2 North, Range 67 West of the 6th F.I., County of Weld, State of Colorado being more particularly described as follows: Basis of Bearing: Considering the North fine of the East 1%% of the Northeast % of Section 5, Township 2 North, Range 67 West, of the 66 P.M., to bear North 89° 41' 47" West and with all other bearings contained herein relative thereto: Commencing at the Northeast Section corner of Section 5, Township 2 North, Range 67 West said point being the Point of Beginning; thence along the North line of the East % of the Northeast 1/4 of said Section 5, N 89°41'57" for a distance of 824.51 feet; Thence departing said North line along the East line of Lot A of RE -4884 S 00°21'13" for a distance of 367.14 feet to a point on the center line of the Lupton Meadows Ditch; Thence along said centerline of the following fifteen (15) courses and distances; 1. S 66°49'07" E for a distance of 66.50 feet; 2. S 43'03'23" E for a distance of 111.78 feet; 3. S 36°04'53" E for a distance of 72.41 feet; 4. S 58°09'29" E for a distance of 26.82 feet; 5. S 8733'37" E for a distance of 84.82 feet; 6. S 76°06'14" E for a distance of 98.13 feet; 7. S 55°31'17" E for a distance of 75.71 feet; 8. S 44°44'06" E for a distance of 138.86 feet; 9. S 64°30'06" E for a distance of 105.30 feet; 10. N 8.2°S2'59" E for a distance of 30.65 feet; 11. N 36°19t51tt E for a distance of 50.15 feet; 12. N 13°06'00" E for a distance of 98.33 feet; 13. N 33°02'16" E for a distance of 60.78 feet; 14. N 43°18'M" F, for a distance of 79.17 feet; 15. S 70'12'13" E for a distance of 19.57 feet to a point on the East line of said East 1/2 of the Northeast'/; Thence along said East line N 00°03' 00" E for a distance of 515.39 feet to the Point of Beginning. 3 Show Full Headers I Print I Close Printer View From; <sheriIockman©what-wire.com> To: "Kuledge, Michael" <M ichael . Kuledge@a nadarko.com> Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Date: Thu 12/01/16 01:22 PM Mike, Mr. Rein sent me a letter that said his new phone number is 720-725-8805. Please let me know what you are discussing with Mr. Hein. He has asked me to handle everything. We won't have the new plat for a while. The easement will be on the change of Zone plat. You are a referral for the county so you will get to see the new plat. Sheri --- Michael.Kuledge@anadarko.com wrote: From: " uledge, Michael" <Michael.Kuledge@anadarko,com> To: "sherilockman@what-wire.com" ocl ma n@what-wire.com" <sherilockman@what-wire.com> re. com > CC: "Ross, Katherine" <l ather-irye.Ross@anadarko.com> Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Date: Thu, 1 Dec 2016 19:52:25 +0000 Sheri, our surface land team has been trying to contact Mr. Rein for the past few weeks tofurther discuss this application and a few other topics. Would you have any way of knowing how to get in touch with him or to facilitate a meeting with him? All of our attempts to contact him are not working at this time. We'd like to discuss this agreement and our concerns with him. Would you also have the revised plat that included that missed easement? Thank you. Regards, Mike 3 Michael T.: uledge, CPU Sr, Landman 1099 18th Street, Denver CO 80202 (720) 929-3710 (Denver Direct) Michael,l r iedue Anadarl o..co Pertoleurn Cor o{o;a on From: sherilcckman@what-wire.com frrailto:sherilockrnan@what-wire.com] Sent: Thursday, December 01, 2016 10r29 AM To: Kuledge, Michael Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Mike, Have you had a chance to consider what you would like to propose for a land use agreement for the Hein property at the SW corner of County Roads 17 and 26? Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, Co 80615 970-381-0526 si icrr loLkn icirOAsihai t-wrrtcorr wrote: From: " <sher-i I e:c rnan+ what- ire.coni> To: "Kuledge, Michael" <Michael uIedgeccLanadako.cor > Subject: R E : Silver Mountain Estates - Anadarko Objection Justification Date: Tue, 8 Nov 2016 09:08:44 -0800 Mike, The P.0, , Box for Mr. Hein is : Richard Hein P.O. Box 649 Fort Lupton, CO 80621 Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, CO 80615 970-381-0526 Michael ,uIe.dge@pn 4Sr c. nom wrote: From: "Kuledge, Michael" < Mi►chaei . ul+edge(anadarko.com> Show Full' Headers I Print I cIpe Pri�t�er Mliew From: "Kuledge, Michael'. cMichrael.I uledge@anadarko,com> To: "sherilockman@what-wire.com" <sherilockrnan©what-wire.com> Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Date: Fri 11/04/16 08:06 AM Thank you Sheri, I will be out of the office all of next week and will circle back with you in the following week. Have a wonderful weekend. Regards, Mike Michael T. Kuledre. RPL j Sr, Landman 109918th Street, Denver CO 80202 (720) 929-3710 (Denver Direct) ichae1a Kuledue Anada rk flnada.1�s P'e'ru al eu r"'' 1 Co! pot ctr on From: sherilockman@what-wire.com [mailto:sherilockman@what-wire.com] re.com] Sent: Friday, November 04, 2016 7:57 AM To: Kuledge, Michael Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Mike, I will be happy to add the missed easement to the plat at the next phase of the PUD D process. I will forward you a copy at that time, Mr. Hein gave me the new number 720 372 9138. I have never been able to get him at this number either f have a PC Box that I send letters to when I need to tell him something or have him contact me. 1 will be out of the office until Tuesday . I will forward the address when I get back. I have been asked to handle all phases of this subdivision so please let me know what you would like to have written into the agreement that you are proposing. We will be happy to work with you. Please let us know what concerns you have and how we can address them. Thank you, Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, CO 80615 Michael, Kuledgeaanadar o.co wrote: From: "Kuledge, Michael" <Michaei■I u1edge ana'dar oicorr> To: ",sheri lock•man@what- ri re4com" < heri i�Qck an w at-wireacom> CC: "Shoulders, Justin" <JustinpShoulders@anadarkolcorn>, "Ratliff, Paul" <Paul Ratliff anadarko.com> Subject: RE: Silver Mountain Estates - Anadarko Objection Justification Date: Thu, 3 Nov 2016 21:20:58 +0000 Good afternoon Sheri, Thank you for your response in these matters. I am reviewing your points and discussing them within our teams One point of clarification to make is that Anadarko is the mineral owner of said coal underneath the property. This is a property right that needs to be acknowledged andevaluated for when such developments are proposed throughout area. As stated before, Anadarko is willing to work through these concerns with Mr. Hein, I will be awaiting the updated PUD sketch plan to reflect the most current ROW. Do you have a current phone number in which we would be able to contact Mr. 1-tein? The one provided within the application does not seem to be reaching him. Thank you. Regards, Mike Michael T. K_uledge1 BPL ISr, Landman 109918th Street, Denver CO 80202 (720) 929-3710 (Denver Direct) ichaeL.KyiedgeftAnadarko.corn flsia • wire Petroleum Corpotofion From: shri Ioc mall y,hat. -w re.ecom imaiito:sherilockrnanUwhat-wfre.coml Sent: Friday, October 28, 2015 12:10 PM Sheri Lockman (sherlrrd;exr-li mA niThvy'hrat-LAfir corn) Frig 10/28/16i 12:11:30 -,0600 Show Full Headers I Print I Close P l nter Vie From: "" <sherilockman@what-tre.cor > To: "Kuledge Michael" <Michael. uledge@anadarko.con> Subject: Re: Silver Mountain Estates - Anadarko Objection Justification Date: Fri 10/28/16 12:09 PM Mr Kuledge, I had the chance to read through the letter that you submitted to Weld County regarding the Hein Planned Unit Development, We will be happy to make sure that the easement that Mr. Hein signed in February of 2016 is included on the plat. Mr. Hein has been very agreeable in the last two years by granting two easements to Kerr-McGee for the placement of pipelines. These easements have a significant impact on the prospective development of the surface property. As your letterstates owners of split estates must exercise their rights in a way that gives due regard to the rights of the other'.. Your letter indicates that you are interested in the coal under the property. This is not a legitimate concern as the coal is not economically feasible to mine given the size of the property. Although we do understand your interest in preserving your rights to the mineral interests below -this property, we do want to point out that the site could easily be reached by directional drilling from a number of existing locations in the vicinity. Further, only a small portion of the designated Colorado Oil and Gas Conservation Commission drilling window lies on the property. Given the sizable oil and gas related encumbrance already on the property we ask that you please let us know what the mutual acceptable agreement" that you are proposing would include. Thank you, Sheri Lockman Lockman Land Consulting, LIZ 36509 CR 41 Eaton, Co 80615 970-381-0526 Michael. Kuledge©anadarko. corn wrote: From: "Ku ledge, Michael" < Mishael.Kuledge@anadarko.cor > To: fisherilockman@what-wire.corn" <sherilockman@what-wire.cor> C C : "Ratliff, Paul" < Pau l . Ratliff@anadarko. coin>, "Shoulders, Justin" <J ustin , Shoulders@ a radar ko, com>, "Billadeau, Jake" <Jake.Billadeau@anadarko.com> Subject: Silver Mountain Estates - Anadarko Objection Justification Date: Thu, 27 Oct 2016 22:06:51 +0000 Good afternoon Ms. Lockman, Per our conversation earlier this afternoon, please find the attached Silver Mountain Estates development objection. This should help clarify the points of discussion we covered along with the right of way we would like to see depicted on the PUD sketch plan. Anadarko will file its objection with the County but intends to work towards a mutually agreeable outcome with its concerns. Please forward on to Mr. Hein as you indicated that his is difficult to reach. You might have a more direct line of communication. Please contact me with any further questions. Thank you. Regards, Mike Michael TtlQuiedgel RPL j Sr* Landman 1099 18th Street, Denver CO 80202 (720> 929-3710 (Denver Direct) Michael. uledoe Anadarko,corn adarire An Petrol t! CO4pOdOtiOn Click here for Anadarko's Electronic Mail Disclaimer Sheri Lockman ( c he r nr rnan© what-wi recom) - Fri, 10/28/16 12:11:30 -0600 a Potrolcurn Corporation October 17, 2016 VIA E-MAIL Kim Ogle, Planner Weld County -- Department of Planning 1555 N 17th Ave Greeley, CO 80631 Did c(fes:vc cidiwv acorn NOTICE OF MINERAL INTERESTS 1 IL AND GAS LEASEHOLD INTERESTS AND PIPELINE EASEMENTS. NED BY ANADARKO LAND CORP. KERR- MeGEE OIL & GAS ONSHORE LP AND KER -Mc EE GATHERING LLC OBJECTION Re: PUDK16-0005 Richard Hein - Property Owner or "Applicant" Township 2 North, Range 67 West Section 5: part of the E/ NE/4 ("Property") Weld County, Colorado Mr. Ogle: This objection and notice letter is submitted to Weld County ("County") on behalf of Anadarko Land Corp. ("Anadarko Land"), Kerr-McGee Oil & Gas Onshore LP ("Kerr- McGee") and Kerr-McGee Gathering LLC (" Gathering") with respect to the application for Planned Unit Development that has been filed with the County by Richard Hein ("Applicant") that includes property in the E/2NE/4 of Section 5, Township 2 North, Range 67 West in Weld County ("Property"). Anadarko Land owns the coal that underlies the Property. Kerr-McGee owns oil and gas leasehold interests in the Property. Anadarko Land and Kerr-McGee wish to give notice to the County of the mineral interests and oil and gas leasehold interests they own under the Property and make the County aware that the approval of a final appl i cati nn may significantly impact the prospective development of the minerals and oil and gas interests that underlie the Property, The Anadarko Entities and Kerr-McGee object to the approval of a final application for development until agreements on surface use are reached among Anadarko Land, Kerr- McGee and the Applicant covering the Property, The following are comments in support of this Notice and Objection: l . The Mineral Resources ()wiled by Anadarko Land Corp, Anadarko Land owns the coal that underlies the Property. Anadarko Land has reviewed the Property for coal resource potential and determined that the Property is underlain with Laramie Formation coals that are approximately 9.7 feet thick and lie at a depth starting at approximately 100 feet. Laramie Formation coals have a high BTU of approximately 8,900 to 9,800 btu/lb and a low sulfur content of between .3 and .8 percent. Anadarko Land estimates that there may be over 11.4 million tons of Laramie Formation coal in Section 5. 2. The Oil and Gas Resources Owned by Ken. -McGee. Kerr-McGee owns oil and gas leasehold interests for the Property. Colorado Oil and Gas Conservation Commission ("COGCC") reports reflect that there are currently thirty-two producing wells in Section 11. Current COGCC rules and regulation provide for five drilling windows in a quarter section where the Property is located, one in the center of the quarter section and one in the center of each quarter quarter section. There is Clear Statuto Authority andir�ion .l car the County to Take Into Account the Ri *its of Mineral interest Owners in 1t'Consideration of Applications for Development. The State of Colorado recognizes the important rights of mineral owners and lessees in C.R.S. § 30-28-133(10) which states and acknowledges that both the mineral estate and the surface estate are interests in land and that the two interests are "separate and distinct." The subsection specifically recognizes that the owners of subsurface mineral interests and their lessees have "the same rights and privileges as surface owners." 4. Owners of Split Estates Must Exercise Their Rights in a w!'a_ythat Gives Due Regard to the Rights of the Other. Colorado law provides that the mineral owner has the right of reasonable access to and use of the surface estate to extract minerals and that the mineral estate owner and the surface estate owner are to give due regard to the rights of the other and reasonably accommodate each other's rights, 5. Anadarko Land _and Kerr- W ce Have Entered into Many Agreements with DevelmerTs With Restieet to the Disposition of the Minerals at the Time that the Developer Proposes to Develo bar the Parties Ent r nginto Such an A _ireement. the Surface Estates and the Public interest Served The mineral assets have significant value and consequently Anadarko Land and Kerr- Mcee are concerned that the approval by the County of an application for development of the Property and the subsequent build -out of the Property may impair their ability to develop their minerals and oil and gas interests. Any future surface development plans approved by the County should incorporate and designate lands to be set aside for oil and gas development and expressly provide protection for future wells, pipelines, gathering lines and related oil and gas facilities and equipment. Approval of any surface development plan that forecloses the rights of mineral and leasehold owners may be a compensable taking. Anadarko Land and Kerr-McGee have extensive mineral and oil and gas leasehold interests throughout the State of Colorado and have successfully worked with many parties who wish to develop the surface estate in order to assure the compatible development of the surface estate and the oil and gasestate or some other disposition of the miners. The practice of Anadarko Land and Kerr-McGee is to meet with surface owners to reach a mutually acceptable agreement, including the disposition of the hard rock mineral interests. To date, Anadarko Land Kerr-McGee have not had any discussions with the Applicant on this matter. Because no agreement has been reached between the parties that covers the Property, and in order to protect theft mineral and oil and gas interests and private property rights, the Anadarko Land and Kerr-McGee object to the application and request that the County make any approval of a final application for development of the Property conditioned upon an agreement among Anadarko Land, Kerr-McGee and the Applicant. In addition, .MG1CMG Gathering objects to the application because a valid easement is not identified and labeled on the PUD Plat, The Right -Of -Way Grant was executed February 10, 2016 and recorded June 16, 2016 with the Weld County Clerkand Recorder at reception number 4211786. ICMG Gathering requests that the County make any approval of the application conditioned upon the Applicant's conformance to the terms of the referenced Right -Of -Way Grants and its inclusion on the PUD Plat. Please contact me at 720-929-3710 if you have any questions or comments about this matter, Anadarko Land and Kerr-McGee hope to conclude a mutually acceptable agreement with the surface owner of the Property, and we look forward to working with the County to accomplish its land use planning goals. Sincerely, ANADARKO RKO PETROLEUM CORPORATION Michael Kuledge Landman cc: Jeff Fiske, Lead Counsel Ron Olsen Don. Ballard Paul Ratliff Sheri Lockman Show Full Headers C Print I Close Printer View From: "Moss, Douglas C" c m oss d@wcsd re 1. org > To: sherilockman@what-wire.com Cc: Richard L Wright < wri ghtri@wcsdre 1.org> Subject: Re: Development review Date: Thu 12/08/16 03:05 PM Sheri Spoke with Mr. Wright our Transportation Director and gave him a copy of the development. He said he -had no problem as long as the bus could pull in and out of the development and do a circle route to pick up the students. Hope this helps. Let me know if you have any further questions. Doug on Thu, Dec 1, 2016 at 11:26 AM, csherilockman what-wire.com> wrote: Doug, Thank you for your help with this 26 lot subdivision and my four lot Hein subdivision on the southwest corner of County Road 17 and 26. Planning staff asked me to make sure you don't have any further requirements regarding the bus route, turning radius, bus shelters ect. Thanks again, Sheri Lockman Lockman Land Consulting, LLC 35509 CR 41 Eaton, CO 80615 970-381-0526 mossad ►wcsdre1.orig wrote: From: "Moss, Douglas C" <mo sd@`► csdrei.orci> To: therilockman@what-wire.com Subject: Re: Development review Date: Wed, 16 Nov 2016 13:49:3g -0700 Sheri, I have no questions in regards to the change. The amount per site is still the $1,054.20 x 26 = $27,409.20. Once you get a new Case Number they will send this over and I will provide the same letter to the County that Dr. Barbie prepared. Let me know if you have any further questions. Good luck and look forward to the new case number soon. Doug on Wed/ Nov 16, 2016 at 12:50 PM, c=Thc ri Gorelc:ma. _ -what-wire. core wrote: Good morning Mr. Moss, I was given your name as the contact for development review for the RE -1 School District. In 2014 we were approved for a change of Zone for a 16 lot Planned Unit Development. We have resubmitted the application for 26 lots. I have attached the original comments made by Jo Barbie and a new site plan. Could you please let us know the current in lieu payment amount and any other conditions or concerns you may have. Thank you, Sheri Lockman Lockman Land Consulting, LLC Show Full Headers J Print I Close Printer View From: Bob Choate <bchoate@co.Oreld,coo.pus> To: "shedlnckman@what-wlre.com" <sherilockman@whatiftire.com> Cc: Kim Ogle <kogle@cokeid.cQ.ug Subject: RE: Review water agreement Date: Tue 12/13/16 11:54 AM Sherri, Because the CWCWD Water Supply Plan meets the requirements of CRS 29-2O-30 (), the letter dated February 26, 2016 satisfies the water supply requirements required by Chapter 27 of the Weld County CnrIP. ;- This - contingent on the construction of the line extension as described in the CWCWD le tPr I'm fi c, with the purchase of the taps i. line extension at the final plan stage. Let roe know if you need anything else. Thanks, Bob Choate Assistant Weld County Attorney 1150 "0" Street; P.O. Box 758 Greeley, Colorado 80632 Tel: 970-336-7235 Fax: 970452-0242 Email: bchoate@ eidgov.com STATEMENT OF CONFIDENTIALITY F. D I r c 1 . A T•C.�E,� information . Thy , contained in this email message is attorney privileged and confidential, int=ended, only for the use of the individual eri t i Ly named. above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, d'id t r hntio r or copy of this. email is strictly prohibit_e>-j . Tr you have received this erten d 1 in (=e:,� rc,r-, p1e se notifys ; z ... _ _ • bv replying and delete the fl .�3 Thcink .J From: sheri lockrnan@what- ire.corn jmailto:sheri Iockma n@what- i re.com] Sent: Thursday, December 01, 2016 11:46 AM To: Bob Choate <bchoate@co,eld.co.us> Subject: Review water agreement Mr. Cho ate, I have been asked to have the County Attorney's Office review the water agreement for PUDIC] 6-.0005, Silver before I can submit the change �a�'��e. T have attached Mountain Estates, g a copy of the Will Serve letter from Central Weld County Water District. Because this is only a 4 lot subdivision we planned on purchasing the -taps outright. . We would prefer to but will do whatever you ask, g purchase them at Final Plan r i. -) rn- ti t; ;"717 n.:'(i y t fi'"•--, t o /,7 (r d:' Yr° I v t�+� �'�i eft 1 I 18/17 15:08:59 43700 Show Full Headers I Print I Ipso Printer View From: "" sheri lockman@what-wi re. com > To: "Dymond, Stanley A - Longmont, CO" <Stanley,A. Dymond©uses. gcv> Subject: RE: Post box placement Date: Sat 12/31/16 01:49 PM Stanley, Could you please look into this one more time. I still haven't heard anything. Thank you, Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, CO 80615 970-381-0526 -- Stanley.A.Dymond@usps.gov wrote: From: "Dymond, Stanley A - Longmont/ CO' <Stanley.A.Dymond@usps.gov> To: "sheri Iockma n©what-wire.com" < sherd lockman@what- ire com>, "Martin Jr, Bobby P - Longmont, Co" Bobby. P. Marti n@usps. qov> CC: "Dymond, Stanley A - Longmont, CO" <Stanl ey.A. Dymond©usps. qov> Subject: RE: Post box placement Date: Fri, 2 Dec 2016 00:00:43 +0000 Sheri, I truly apologize for this miscommunication. Unfortunately I am on a detail in Denver and am unable to look into this. also forwarded this to the Postmaster requesting his help in getting you a proper answer. I thought the Rural supervisor already gave you the answer on this issue since I haven't heard from you lately. I apologize you still have not been assisted properly. If you do not get an answer soon let me know and I will personally come up to Longmont to resolve this issue. Thank You for your patience and let me know if you need any further assistance in the future. Dymond, Stanley A. Stanley A. Dymond USES Supv Customer Services (303) 776-0184 Work 303453-6922 �.: 303-638-2633 t !obile (r �y Stan l eye ArDy11�1 and@uses.gov 201 Coffman St. Two States + One 1M1ission = Success From: Sheri Iookman@what-}wire. coat [niailto: Sheri loekma r i@what-wire. corn] Sent: Thursday, December 01, 2016 1:58 PM To: Dymond, Stanley A - Longmont, CO Subject: Post box placement Stanley, My name is Shen Lockman. I have spoken to you numerous times regarding postal requirements for a 4 lot subdivision on the southwest comer of Weld County Roads 17 and 26. Last time we spoke you had forwarded my email to the mail carrier She spoke to me once and said the mail boxes could be placed along County Road 26. She was going to let me know which side of the road and email me a confirmation. Unfortunately I have never heard from her. I have been working on this since last March and would truly appreciate your assistance. Thank you, Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, CO 80615 970-381-0526 Sheri Lockman (sherUockman©what1ktMsn com) it,Afe d, 01/18/17 15:08:59 -30700 Show FuHeaders I Print I close Prmer View From: PI II <sherilockman©what-wire.eom> To: "Dymond, Stanley A - Longmont/ CO" <Stanley.A. Dymond@usps. gov> Subject: RE: Hein subdivision Date: Tue 06/07/16 08:22 AM Stanley, I get a call from a lady who said she would email me what you wanted. I never heard from her again. Sheri --- Stanley.A.Dymoncl@usps.gov wrote: From: "Dymond, Stanley A - Longmont, CO" <Stanley,A.Dymond@usps.goer> To: "sherilockman@what-ire.com" <sherilockman@what-wirecore>, "Martin Jr, Bobby P - Longmont, CO" <Bobby.P.Martin usps.gov CC: "Dymond, Stanley A - Longmont, CO" <Stanley,A.Dyriiond@usps,gov> Subject: RE: Hein subdivision Date: Mon, 23 May 2016 11:10:42 +0000 Sheri, Has anyone gotten back with you on this issue yet. If not let me know and I will personally check into this. I originally turned it over to our rural route supervisors since they were aware of the delivery patterns for this area. I apologize in advance if this has not been addressed. Please let me know so we can get it resolved for you. I apologize for the delay and any inconvenience this has caused you. Stan Dymond SCS Longmont, CO. 80501 3034"76-0184 From: sherilockman@what-wire.com [mailto: s heri lockma n©what-wi re. corm] Sent: Tuesday, May 10, 2016 2:57 PM To: Dymond, Stanley A - Longmont/ CO Subject: Hein subdivision Good afternoon, I have spoken to you several times about the requirements for a four lot subdivision to be located at the southwest corner of Weld County Roads 26 and 17. You had indicated that a community mailbox would not be required but you needed to talk to the person who delivers the mail to determine where the boxes should be located. Have you decided where they need to be located? We are required to get verification from the USPS as part of our development application. A response to this email should satisfy the County's requirements. Thank you for your help, Sheri Lockman Lockman Land Consulting, LLC 36509 CR 41 Eaton, CO 80615 970-381-0526 Sheri Lockman (sheri I ockna n@whatwi tse ito ) us Wed, 01/18/17 15:13:05 440700 DECLARATION OF COVENANTS, CONDITIONS AND RESTRICTIONS FOR SILVER MOUNTAIN ESTATES PUD ORGANIZATION Silver Mountain Estates PUD consists of four (4) lots and associated common elements. These covenants and restrictions shall apply to all four lots and shall run with and bind the land in perpetuity. The only powers of the Homeowners Association shall be the responsibility to make all decisions necessary in governing the internal roadway, utility lines within the internal road right-of-way, detention pond and sedimentation pond which comprise the only common elements within the PUD. The property Owner's Association of Silver Mountain Estates adopt the name of Silver Mountain Estates Home Owner's Association (SMEHOA) to refer to those persons covered by these covenants. The owners of each lot shall have one vote as representation in the SMEHOA, provided they are current with any assessments. Decisions shall be made by requiring a minimum of three votes in favor (% votes of 75%) to pass. MAINTENANCE Lot Owners will equally share the cost to maintain the internal roadway, utility lines within the internal road right-of-way, detention pond and sedimentation pond. The cost of any maintenance and repair fee is due at time of completed service. The SMEHOA is empowered to retain the services of a contractor, collect that portion from each affected Lot owner, and pay the contractor upon completion of work. Any Lot owner not paying their entire share of the cost shall be subject to penalties as described in Article 33.3 of the Colorado Revised Statutes, The Colorado Common Ownership. Areas designated detention pond and sedimentation pond are non -buildable areas and shall not be used for storage of any type. Owners of lot 1 and 4 can not alter these drainage areas. The SMEHOA is responsible for maintaining the detention pond and sedimentation pond. DUES If any taxes or fees are owed by the SMEHOA outside of maintenance of internal roadway, utility lines within the internal road right-of-way, detention pond and sedimentation pond or repairs that affect the whole SMEHOA then an annual assessment per Lot shall be assessed on all Association members for payment due by February 1" of each year. Each Lot owner will owe an equal share of 1/4 the total assessment. This assessment may be adjusted, based on cost increases for the next calendar year, at the annual general meeting by attending members. The President of the Association shall provide each member with an annual Financial Statement, an account of dues received and monies disbursed. Common expenses to be paid by the SMEHOA may include; liability insurance, taxes, or fees if any, that may be levied on the internal Roads or the HOA. The SMEHOA is empowered to collect the assessment and fees and to make payments on its member's behalf. Any lot owner not paying their entire share of the tax or fees assessed shall be subject to the penalties listed in Article 33.3 of the Colorado Revised Statutes, The Colorado Common Ownership. GENERAL PROVISIONS 1. As Silver Mountain Estates is located in a farming community, all members agree to accept our farming neighbors' "right to farm and ranch". This provision protects agricultural operators from complaints concerning operations that are legal and responsible. Weld County's Right to Farm statement as of the date of recording reads as follows: Weld County Right to Farm Statement Weld County is one of the most productive agricultural counties in the United States, typically ranking in the top ten counties in the country in total market value of agricultural products sold. The rural areas of Weld County may be open and spacious, but they are intensively used for agriculture. Persons moving into a rural area must recognize and accept there are drawbacks, including conflicts with long- standing agricultural practices and a lower level of services than in town. Along with the drawbacks come the incentives which attract urban dwellers to relocate to rural areas: open views, spaciousness, wildlife, lack of city noise and congestion, and the rural atmosphere and way of life. Without neighboring farms, those features which attract urban dwellers to rural Weld County would quickly be gone forever. Agricultural users of the land should not be expected to change their long-established agricultural practices to accommodate the intrusions of urban users into a rural area. Well -run agricultural activities will generate off -site impacts, including noise from tractors and equipment; slow -moving farm vehicles on rural roads; dust from animal pens, field work, harvest and gravel roads; odor from animal confinement, silage and manure; smoke from ditch burning; flies and mosquitoes; hunting and trapping activities; shooting sports, legal hazing of nuisance wildlife; and the use of pesticides and fertilizers in the fields, including the use of aerial spraying. It is common practice for agricultural producers to utilize an accumulation of agricultural machinery and supplies to assist in their agricultural operations. A concentration of miscellaneous agricultural materials often produces a visual disparity between rural and urban areas of the County. Section 35-3.5-102, C.R.S., provides that an agricultural operation shall not be found to be a public or private nuisance if the agricultural operation alleged to be a nuisance employs methods or practices that are commonly or reasonably associated with agricultural production. Water has been, and continues to be, the lifeline for the agricultural community. It is unrealistic to assume that ditches and reservoirs may simply be moved "out of the way" of residential development. When moving to the County, property owners and residents must realize they cannot take water from irrigation ditches, lakes or other structures, unless they have an adjudicated right to the water. Weld County covers a land area of approximately four thousand (4,000) square miles in size (twice the size of the State of Delaware) with more than three thousand seven hundred (3,700) miles of state and County roads outside of municipalities. The sheer magnitude of the area to be served stretches available resources. Law enforcement is based on responses to complaints more than on patrols of the County, and the distances which must be traveled may delay all emergency responses, including law enforcement, ambulance and fire. Fire protection is usually provided by volunteers who must leave their jobs and families to respond to emergencies. County gravel roads, no matter how often they are bladed, will not provide the same kind of surface expected from a paved road. Snow removal priorities mean that roads from subdivisions to arterials may not be cleared for several days after a major snowstorm. Services in rural areas, in many cases, will not be equivalent to municipal services. Rural dwellers must, by necessity, be more self-sufficient than urban dwellers. People are exposed to different hazards in the County than in an urban or suburban setting. Farm equipment and oil field equipment, ponds and irrigation ditches, electrical power for pumps and center pivot operations, high-speed traffic, sand burs, puncture vines, territorial farm dogs and livestock and open burning present real threats. Controlling childrens activities is important, not only for their safety, but also for the protection of the farmer's livelihood. 2. These Covenants have survivorship and pass to new owners in the event of any future sale of property. 3. Silver Mountain Estates is subject to Article 33.3 of the Colorado Revised Statutes, The Colorado Common Ownership. 4. Silver Mountain Estates Home Owners Association shall have the legal right to attach a lien to the property of any member as a means for enforcing against those delinquent in their dues or any fees. Anyone three months or more behind may be given final written notice and then the lien may be recorded. Any late fees or penalties as a direct result incurred by the Association as well as 18% interest on any unpaid balance, and reasonable attorney fees if necessary may be added. 5. In the case of termination of this Declaration of Covenants, Conditions, and Restrictions for Silver Mountain Estates, each Lot and/or owner shall be required by the Weld County Board of County Commissioners to assume responsibility for maintenance of the Common Elements including the interior road. A complete termination of this Declaration shall not relieve the Association from its responsibility to maintain the Common Elements unless such termination is approved by the Weld County Board of Commissioners. 6. Lot owners should check their homeowners insurance policy to make sure that they are adequately covered for liability insurance covering the common ownership in the internal road. 7. If any paragraph section, sentence, clause or phrase of these Covenants shall be or become illegal, null, or void for any reason or shall be held by any court or competent jurisdiction to be illegal, null, or void, the remaining paragraphs, sections, sentences, clauses, or phrases of these Covenants shall continue in full force and effect and shall not be affected thereby. It is hereby declared that said remaining paragraphs, sections, sentences, clauses, and phrases would have been and are imposed irrespective of the fact that any one or more other paragraph, sections, sentences, clauses, or phrases shall become or be illegal, null or void. Covenants, Conditions and Restrictions for Silver Mountain Estates PUD To be recorded simultaneously with the recording of the Final Plat Richard L. Hein STATE OF COLORADO ) )ss. COUNTY OF WELD ) The foregoing instrument was acknowledged before me on the day of , 20 by Richard L. Hein. WITNESS my Hand and Official Seal, My commission expires: Notary Public LEGAL DESCRIPTION OF PROPERTY SUBJECT TO THIS DECLARATION Lots 1 thru 4 Silver Mountain Estates being part of Lot B Recorded Exemption 4884 in Section 5, Township 2, Range 67 West of the 6th p.m., Weld County, Colorado. Final Plat recorded with the Weld County Clerk and Recorder at Reception # Show Full Headers I Print I Close Printer View From: "" ¢sherilockman@what-wire.com> To: <corkfires@aol.com> Subject: Re: Hein easement Date: Thu 12/01/16 02:02 PM Corky, I spoke to Richard. He is fine with the note on the plat. I will make sure the final plat states "Lupton Meadows shall have the ability to operate and maintain the ditch with no encroachment allowed within the Prescriptive Easement". Thank you for your help, Sheri --- corkfires@aol.com wrote: From: corkfires@aol.com To: sherilockman@what-wire.com Subject: Re: Hein easement Date: Thu, 1 Dec 2016 13:14:03 -0500 The way I understand it is under the prescriptive agreement it is not exclusive so Oil should be fine and the no encroachment just means no building or permanent changes within the easement such as fences or buildings. —Original Message — From: sherilockman sherilockman@what-wire.corn> To: corkfires <corkfires@aol.com> Sent: Thu, Dec 1, 2016 10:32 am Subject: Re: Hein easement Hi Corky, That does seem easier but I will have to run it by Richard Hein. Also, Kerr McGee has already been granted an easement at this location, I don't know how we can take that away from them. We might be able to say no encroachment from the surface owners of the four lots. I attached the right-of-way grants for you to take a look at. Thanks, Sheri --- corkfiresPaol,carn wrote: From: cor kf:res(daal.com To: sherilockman@what-wire.com Subject: Re: Hein easement Date: Wed, 30 Nov 2016 12:32:05 -0500 Hi Sheri, After looking the plans over the Board and our lawyer thought the easiest and most notable solution would be to add a little language to the Final Plot Map stating the following: Lupton Meadows shall have the ability to operate and maintain the ditch with NO Encroachment allowed within the Prescriptive Easement. Let me know your thoughts. Thanks Corky Show Full Headers I Print I Close Printer View From: "" sherilockman@what-wire.com> To: <corkfires@aol.com> Subject: Re: Hein easement Date: Thu 12/01/16 09:32 AM Hi Corky, That does seem easier but I will have to run it by Richard ,Hein. Also, Kerr McGee has already been granted an easement at this location. I don't know how we can take that away from them. We might be able to say no encroachment from the surface owners of the four lots. I attached the right-of-way grants for you to take a look at. Thanks, Sheri --- corkfires@aol.com wrote: From: corkfires@aol.com To: sherilockman@what-wire.com Subject: Re: Hein easement Date: Wed, 30 Nov 2016 12:32:05 -0500 Hi Sheri, After looking the plans over the Board and our lawyer thought the easiest and most notable solution would be to add a little language to the Final Plot Map stating the following: Lupton Meadows shall have the ability to operate and maintain the ditch with NO Encroachment allowed within the Prescriptive Easement. Let me know your thoughts. Thanks Corky —Original Message — From: sherilockman <sherilockman@what-wire.com> To: corkfires <corkfires@aol.com> Sent: Mon, Oct 17, 2016 3:33 pm Subject: Re: Hein easement Corky, That is fine with us. The County is only reviewing the sketch plan. We still have to go through the Change of zone and final plan. Get something drawn up that your attorney approves of and I will see if I can get the maps done. Thanks Sheri --- corkfiresPaof.t,om wrote: From: corkfires(Coaol.com To: sherilockman@what-wire.com Subject: Re: Hein easement Date: Mon, 17 Oct 2016 15:45:29 -0400 Hi Sherri, I just spoke with our lawyer and since our agreement says a permanent exclusive easement and the plans say a prescriptive easement that is also used by oil companies maybe we should work these things out before we approach the County. Thanks Corky —Original Message — From: sherilockman <sherilockman@what-wire.corn> To: corkfires <corkfIres(cilaol.com> Sent: Thu, Oct 13, 2016 5:59 pm Subject: Re: Hein easement I am sorry I did not let you know earlier that Mr. Hein did not have any issues with the agreement. However, the agreement will need copies of the final plan as exhibits. Those will not be available until we complete the final plan through the County. Please let the county know that we intend to enter into an agreement with the ditch company prior to completing the subdivision. Thank you, Sheri Lockman --- corkfires c@aol.com wrote: From: corkfires aaol.carn To: sherilockman@what-wire.com Subject: Hein easement Date: Thu, 13 Oct 2016 17:13:05 -0400 Sherri I am assuming that since we have not heard back from you in regards to the easement agreement the Board had me forward to you that Mr. Hein is not interested in signing it. Since he has proceeded with the plans to the County and they have asked for our input unless I hear differently it's a no go with the agreement and the Board will make their thoughts to the county with that in mind. Sincerely Howard Cantrell Secretary Lupton Meadows Ditch Attachment: Save View Name: Easement.pdf Type: application/pdf Attachment: Save View Name: KerrMcGee ROW.pdf Type: application/pdf leMP fr WELD COUNTY Sirs ON1.11'V E MAPPING Enter Map Title • 572.02 WGS_1984Wet_ Mercator_Auxiliary_Sphere 0 Weld County Colorado 1,144.0 Feet Tt•i; map is : Asa<; generated static output f. om Internet m Ipprng site and is fr..: refewer...e or,' . Dat il 1a; ers tl appe, r on this map may or ma; not te. accurate, current, or otl erwise THIS MAP IS NOT TO BE USED FOR NAVIGATION E_ IR • a it: DCI1ifLI. Legend Parcels Floodplain - Labels Floodplain - 500 Year Floodplain - 100 Year Zone A Floodplain - 100 Year Floodwa Floodplain - 100 Year Zone AF Floodplain - 100 Year Zone AI- Floodplain - 100 Year Zone AC Highway County Boundary 1:6,864 O Notes Enter Map Description i!'�'� . i P 60' ROW 4' MAICH CLASS EXISTING ABC GRADE 4,7' SHLDR 4:7 MIN 25 16' TRAVEL LANE 2% 16' TRAVEL LANE 2% 4' CLASS 6 ABC SHLDR 4.7' MAICH EXISTING GRADE * NOTE: * 6" CDOT CLASS 6 AGGREGATE BASE COURSE MIN 7 4: 7 * 9" OF SUBGRADE SOILS TO BE SCARIFIED AND "- RECOMPACTED TO MIN 95% ASTM D698-78 STANDARD PROCTOR AT ± 2% OPTIMUM MOISTURE. SUBGRADE PREPARATION, AND AGREGATE BASE COURSE TO BE DETERMINED BY GEOTECHNICAL SUBSURFACE EXPLORATION REPORT. land Consulting, LLC Sheri Lockman 36509 WCR 41 Eaton, CO 80615 970-381-0526 sherilockman@what-wire.com To Whom it May Concern, Please consider this our request for a variance from pavement for Silver Mountain Estates. Mr. Hein would like to use the Rural Local Unpaved specifications as shown in Appendix 24-E of the Weld County Code. The interior road shall be maintained by the Silver Mountain Estates HOA. The subdivision is accessed from County Road 26 which is gravel. Further, County► Road 26 is maintained by the Town of Firestone. David Lindsay, Town of Firestone Engineer, has indicated that the Town does not object to the private drive being a gravel roadway. Mr. Hein will apply for an access permit from the Town of Firestone and meet all permit requirements. Sincerley, Sheri Lockman Preliminary i raina a Report Silver Mountain Estates PUD Lots 1 thru 4 WCR 26/WCR 17 Firestone, CO. 80520 March 2017 "I hereby certify that this report for the preliminary drainage design of Silver Mountain Estates PUD was prepared by me (or under my direct supervision) in accordance with the provisions of the Weld County storm. drainage criteria for the owners thereof" Mark A. Taylor Registered Professional Engineer State of Colorado No. 46065 1 Table of Contents 1. General Location and Description ..... 3 A. Location 3 B. Description of Property 3 IL Drainage Basins and Sub -basins .P4 A. Major Basin Description 4 B. Sub -Basin Description f... III. Drainage Design Criteria A. Regulations 4 B. Development Criteria Reference and Constraints F.4 C. Hydrological Criteria 5 D. Hydraulic Criteria ... IV. Drainage Facility Design . ...6 A. General Concept 6 B. Specific Details 7 V. Conclusions .... . $ VI. References s Page A I - 4 A5-6 A7- 14 A15- 17 A1s- 19 A20 A21 A22 A23-24 A25- 26 A27 A28 A29 A30 A31- 33 A34- 36 A37 A38- 40 11 Pgs 10 Pgs Appendix A Table of Contents Data Site Soil Survey Data IDF Curve Calculations NOAA ATLAS 2 Volume III Drainage Calculations Time of Concentration Equations- Table 6-2 Table 6-2 Table 5-10 Design Storm Frequencies Table 6-5 Run off Coefficients Modified FFA Method with Adjusted I values Modified FFA. not Adjusted Pond Volume Calculations Orifice Plate Calculations Circular Conduit Flow Figure 9-39 Riprap Sizing USDCM Figure 8-34 Riprap Detail and Placement Property Information FIRM Benchmark Data Sheet Appendix B Urban Drainage and Flood Control District Appendix C Colorado Dept. of Public Health & Environment 2 General Location A. Location 1. The Preliminary Plan Drainage Report is for a parcel located in part of the East A Northeast 1 Section 5, Township 2 North, Range 67 West of the 6th P.M. 2. The site location is Southwest of the intersection of WCR 26 and 17. A short Cul-de-sac road, 145 feet in length, is the proposed access for the 4 proposed lots. 3. The Lupton Meadows Ditch is located on the southern side of the site. 4. The area surrounding the site is largely undeveloped. The Town of Firestone has annexed the properties to the north and east and all of the roadways in the surrounding area. The area to the south of the site is agricultural land in Weld County and the property to the west is a residential property which is also located in Weld County. B. Description of Property 1. The area covered in this drainage report is Lots 1 thru 4 of the proposed Silver Mountain Estates PUD. The area of development is ± 11.39 Acres including the adjacent road right ofways. 2. The existing ground cover, on the site is dense native prairie grass that has not been farmed for several years. The site has two soil types, Vona loamy sands (99.4%) and Loup-Boel loamy sands (0.6%). The Vona loamy sands type A (Hydrologic soil type) while the Loup-Boel loamy sands is type AID (Hydrologic soil type). Type "A" soils will be used in report calculations. 3. The Lupton Meadows ditch is located on the southern side of the proposed development and is operated by: The Lupton Bottom Ditch Company Inc. 11016 County Road 23 Fort Lupton, CO 80621 Gene Wagner President 970 785-2147 4. The proposed site development of the site would consist of 4 single family building lots. The single-family lots range in size from ±2.08 ac to ±3.23 AC. The proposed road will consist of a short road and cul-de- sac, the total proposed center line of road length, including the cul-de-sac is 145 feet. 5. The Lupton Meadows ditch is located on the southern side of the proposed development and is operated by: The Lupton Bottom Ditch Company Inc. 11016 County Road 23 Fort Lupton, CO 80621 Gene Wagner President 970 785-2147 No other irrigation facilities exist within 200 feet of the site. 3 6. The ground water table is assumed to be deep at the subdivision site. From the Web Soils Survey, the depth to ground water is 6.5 feet or deeper. IL Drainage Basins and Sub -Basins A. Major Basin Description 1. Weld County Public Works was contacted in regards to existing drainage reports and Master Drainage plans in the area. No information was available. 2. The site is located in the South Platte Drainage basin. On a local scale, the site is located in the St. Vrain drainage basin, the St. Vrain river is located about 1.4 miles to the Northwest. Both of these drainage basins have been transforming from a rural to an urbanized area for several years. 3. Floodplain: the site is not affected by a floodplain per Firm Panel 08123C189 E, dated January 20,2016, please see the attached FIRM. B. Sub -Basin Description 1. The historic drainage pattern of the site is as follows. In general, Stormwater flows at this site flow from the South to the north at 2.0 to 2.5% grades. All offsite stormwater flows from the south are intercepted by the Lupton Meadows Ditch. No off -site stormwater flows enter the site from the east or north. A small area to the west of the site, 14,280 sf or 0.33 AC, does contribute as small amount of stormwater onto the site, this is a residential parcel. The surrounding areas are farmed, meadow/range land or in a fallow state. 2. All offsite stormwater flows from the south are intercepted by the Lupton Meadows Ditch, no off -site stormwater flows enter the site from the south east or north. A small area to the west of the site, 14,280 sf or 0.33 AC, does contribute as small amount of stormwater onto the site, this is a residential parcel. III. Drainage Design Criteria A. Regulations 1. The criteria used in this drainage design is the Weld County Engineering and Construction Criteria, dated April 2012 and the Urban Drainage and Flood Control District, Urban Storm Drainage Manual Criteria Manual Volumes I & II, dated January 2016, and the Urban Drainage and Flood Control District, Urban Storm Drainage Manual Criteria Manual, Volume TIT dated September 2010. The stormwater detention volumes have been determined using the Modified. FFA. method as obtained from the Urban Storm Drainage Web Site. B. Development Criteria Reference and Constraints 1. Weld County Public Works was contacted in regards to existing drainage reports and Master Drainage plans in the area. No information was available. 4 2. In general, Stormwater flows at this site flow from the South to the north at 2.0 to 2.5% grades. All offsite stormwater flows from the south are intercepted by the Lupton Meadows Ditch. No off -site stormwater flows enter the site from the east or north. A small area to the west of the site, 0.33 ac, does contribute as small amount of stormwater onto the site, a residential parcel. The proposed development of a 4 Lot PUD will not affect the surrounding properties as the historic drainage patterns will remain intact at the downstream limits of the proposed development. The proposed street for the PUD. will consist of a cul-de-sac road with a center line length of 145 feet as measured from the centerline of the Weld County road to the centerline of the cul-de-sac. There are no existing structures on the site. There are existing gas pipe lines located on the eastern side of the site. No development or site grading is proposed in the area of the gas pipe lines. No culvert exists under WCR 26, at the present time, stormwater gathers on the southern side of WCR 26 until it over tops WCR 26 during larger storm events. The addition of the detention pond, in the PUD, will reduce the over -topping events that now occur over the County roadway. C. Hydrological Criteria 1. Rainfall curves and tables were determined using the NOAA ATLAS 2, volume III and the Urban Drainage Spreadsheet Depth -Duration - Frequency and Intensity -Duration -Frequency Tables, please see the attached spreadsheet. 2. The design storm recurrence intervals used in this drainage design are the 5 -year historic stormwater flow value for the release rate from the detention pond for storms up to the 100 -year event. The 100 -year storm event for the emergency overflow weir have been calculated and used in sizing the said weir. 3. The Ration Method is used for runoff values for the emergency overflow weir and riprap design. The rational method calculations can be found in the appendix. The modified FFA Method has been used to determine the required stormwater detention values. With the changes to the runoff coefficients made in the current USDCM, Volume I, dated January 2016, the Modified ed FFA value for the imperviousness, I, is adjusted to adjust the runoff coefficients to the current accepted "C" values. The modified FFA method spreadsheet can be found in the appendix. 5. No other drainage criteria or calculation method for the Hydrological Criteria were used in the preparation of this drainage report or drainage design. D. Hydraulic Criteria 1. There are no conveyance capacities, other than the release structure components, to be checked in the grading and drainage for the proposed PUD. The stormwater conveyance pipe from the detention pond has been modeled using the Circular Conduit Flow Spread sheet for the Urban Drainage Web page, this spreadsheet can he found in the appendix. 2. The detention release structure will consist of a weir wall with a stormwater pipe and stormwater release plate, two stages, the lower orifice is for WQCV release and the upper orifice is for the Historic 5 -year release rate. The orifice sizes have been determined using the City of Greeley orifice equations, please see the calculation as presented in the appendix. The sizing of the release structure pipe has been sized and checked using the Circular Conduit Flow spreadsheet as obtained from the Urban Drainage Web site, and can be found in the appendix. 3. The riprap design for the overflow structure and stormwater outlet pipe were determined using the US DCM for riprap design. Chapters 8 and 9 of the USDCM have been used to aid in the design process, please see figure 9-39 for the riprap sizing and Figure 8-34, parts 1 through 3, the extent of riprap protection and placement in the appendix. 4. The broad crested weir equations from the City of Greeley Design Criteria and Construction Specifications, Storm Drainage, Volume II, dated March 2007, have been used to size the emergency overflow weir from the detention pond. The City of Greeley weir equation 11.4.3.A11) has been used due the ease of use of the weir equation. IV. Drainage Facility Design A. General Concept 1. The proposed drainage concept is to use the natural grades that now exist on site, the typical drainage pattern is from the south to the north property line. The proposed detention facilitieswill be located along the north side of the development, the stormwater detention will be on lots 1 and 4 of the PUD. The stormwater from each lot will be directed to the proposed detention pond by a system of lot line drainage swales and the barrow ditches along the proposed street. Stormwater flows not captured by the lot line drainage swales will sheet flow to the northern side of the site and be collected in the detention pond. The existing site drainage patterns will be altered slightly. Historic drainage patterns will be maintained at the ROW line on the northern side of the property. The detained stormwater will be released at the historic 5 -year rel ease rate for storm events up to the 100 -year event, the result is a decrease in stormwater flow values for storm events larger than the 5 -year storm. Storrnwater released from the detention pond will be released into the County ROW. 2. The proposed drainage facilities will control the stormwater that leaves the site, the controlled release rate is the historic 5 -year storm. At this time, there is no culvert under WCR 26. This may be a result 6 of a culvert not being needed or one has never been placed. There is a sump point that now exist in this section of WCR 26. No culvert, under WCR 26, is proposed at this time. 3. The Depth -Duration- Frequency and Intensity- Duration -Frequency Tables have been created using the Urban Drainage Spreadsheets as obtained from the Urban Drainage Wed Site, using the NOAA ATLAS 2, Volume III. Table 6-2, from Volume I of the USDCM, the value of 5 use used in the historic tc calculations. Table 6-3 was used to determine the imperviousness value for the proposed development, for residential site with 2.5 AC and large provided an I value of 12%. Table 5-10 from the Weld County Engineering and Construction Criteria was used to obtain the 5 -year historic allowable release rate. Table 6-5 of the USDCM was used to determine the different runoff coefficients required for the drainage design. Figure 9-39 was used to designthe detention pond rundown, riprap, for the overflow weir. Figure 8-34, parts 1-3, have been utilized for the extent of riprap protection. 4. The proposed drainage structures for this drainage design include an emergency over flow weir for the detention pond, a release pipe, from the detention pond, an 2 -stage orifice plate for metered release of the detained stormwater at the historic 5 -year release for the site and a 18" CMP pipe will link the eastern and western detention ponds. B. Specific Details 1, The detention pond and orifice release plate, as designed, will control the stormwater runoff from the site at the rates as set forth in the Weld County Code. 2. No drainage problems were encountered in the drainage design at this site. 3. The detention pond size of 43,066 was designed into this site, the required detention volume, including the WV, is 3 9,13 5 CF. The excess +900 CF of detention volume is for the future sedimentation that will occur at the site. Once the site has stabilized, the detention pond will require cleaning every 5 to 10 years, after the completion of grading AND the site has been stabilized, the detention pond will require one cleaning. 4. The detention pond is located on the northern site of the proposed development. The side slopes of the detention pond are 3: and 4:1 slopes and most equipment will be adequate in mowing the detention pond as needed. Detention pond cleaning, silt removal, can be performed using small equipment such as a skid -steer loader. All culverts for the proposed development have been place with slopes to obtain a cleansing velocity. A drainage easement will be required for all drainage swales and the detention pond. The drainage system, as designed, will be easily maintained. 5. The general contractor or owner will be required to fill out all forms to obtain a SWMP permit. The base drawings and general site notes for the SWMP permit have been included with this drainage report. V. Conclusions A. Compliance with the Weld County Code 1. The stormwater drainage design is in compliance with the Weld County Code. B. Drainage Concept 1. The drainage design for the proposed development will reduce downstream historic runoff rates for storms from the 5 -year storm event to the loo-yaer storm eevent. 2. Weld County does not have and master drainage plans in the area of the proposed development. 3. No irrigation facilities are affected by this drainage design or plan. IV. References a. Urban Storm Drainage Criteria Manual, Volume I and IL Revise January 2016. b. Urban Storm Drainage Criteria Manual, Volume III. Revise December 2010. c. Weld County Addendum to the Urban Storm Drainage Criteria Manual, October 2006. d. Urban Storm Drainage Web Site for Spreadsheet Models. e. City of Greeley Storm Drainage Manual Vol. II, March 2007. f. Civil Engineering Reference Manual, Lindeburg Eleventh Edition. g. Colorado Department of Public Health and Environment, SWMP Permit. h. USDA Natural Resource Conservation Service, Web Soil Survey, National Cooperative Soil Survey, Accessed May 20145. i. Weld County Engineering and Construction Criteria, April 2012, Draft Copy. j. NOAA Atlas 2, Volume III 8 507800 CO101 31' N air •40° BY 27 N r R 507840 507880 6 t 507920 41. Ain AP r r ii . • ir .k%•`� _ ! Hydrologic Soil Group —Weld County, Colorado, Southern Part 507960 5040 X - • 5060.80 t . iet • ir. '„ (.• Irk . 1 1 -1: J i 507800 507840 507883 507920 507960 5 0Ob 508040 A a 'Meters a N 0 30 60 120 180 A 0 50 100 200 300 Feet Map prvjer orl; web Mercator Corner coordinates: vkS84 Edge tics: UTM Zone ON Map Scale: 1:2,030'pitted on A tm (11" x 85") sheet. usDA. Natural Resources Dleig Conservation Service 509120 508160 508240 Web Soil Survey National Cooperative Soil Survey I f. 92e120 ai• ---ice. r,tj 104'° 54'11'% 506240 9/22/2016 Page 1 of 4 44° 1d2%N Hydrologic Soil Group —Weld County, Colorado, Southern Part MAP LEGEND MAP INFORMATION Area of Interest 1AO1) n Area of Interest (AO1) Soils Soil Rating Polygons A AID B/D G c/D D I I Not rated or not available Soil Rating Lines A AID — B O 4.00 BID POW c # , ,r C/D D • .+ Not rated or not available Soil Rating Points A AID ® B BID a O 0 0 0/D D Not rated or not available Water Features Streams and Canals '•1 Transportation trI. Rails Interstate Highways US Routes MMha}or Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOl were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scare. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nres.usda.gov Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below, Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 14, Sep 22, 2015 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Mar 16, 2012 —Apr 13, 201' 2 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps, As a result, soma minor shifting of map unit boundaries may be evident. Uscw. Natural Resources Web Soil Survey 031406 Conservation Service National Cooperative Soil Survey 9/22/2016 Page 2of4 Hydrologic Soil Group —Weld County, Colorado, Southern Part Hydrologic Soil Group Hydrologic Soil Group— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618) Map unit symbol Map unit name Rating Acres in ACM Percent of AOl 35 Loup-Boel 0 to 3 percent loamy slopes sands, A/D 0.1 0.6% 72 Vona percent loamy slopes sand, 0 to 3 A 7.7 69.3% 73 Vona loamy percent slopes sand, 3 to 5 A 3.4 30.2% Totals for Area of Interest 11.1 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, BID, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, BID, or CID), the first letter is for drained areas and the second is for undrained areas. Only the soils that in theft natural condition are in group D are assigned to dual classes. USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey A a 3 912212016 Page 3 of 4 Hydrologic Soil Group -Weld County, Colorado, Southern Part Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff None Specified Tie -break Rule: Higher USDA Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey A a 9/22/2016 Page 4 of 4 De thpDuration-Frequency and Intensity -Duration -Frequency Tables for Colorado Hydrologic Zones I through 4 Blue cells are inputs. Project: Silver Mountain Estates (Firestone, CO) —Where is the Watershed Located? 0Located within 4JDFCD Boundary Located outside of UDFCD Boundary 1 Hydrologic Zone (1, 2, 3, or 4) = Elevation at Center of Watershed = Watershed Area (Optional) = (Optional) Select a location within the UDFCD boundary: (see map) ft sq. mi. 1. Rainfall Depth -Duration -Frequency Table If within the UDFCD Boundary, Enter the 1 -hour and 6 -hour rainfall depths from the USDCM Volume 1. Otherwise, Enter the 6 -hour and 24 -hour rainfall depths from the NOAA Atlas 2 Volume Ill. Return, Period Rainfall Depth in Inches at Time Duration 5 -min 10 -min 15 -min 30 -mina 1 -hr 2 -hr 3 -hr 6 -hr 24 -hr 2-yr 0.27 0.44 0.55 0.76 0.97 1.14 1.27 1.46 2.07 5-yr 0.40 0.63 0.79 1.10 1.40 1.60 1.76 2.00 2.80 10-yr 0.48 0.76 0.96 1.32 1.68 1.92 2.09 2.37 3.20 25-yr 0.58 0.92 1.16 1.60 2.04 2.33 - 2.54 2.88 4.00 50-yr 0.67 1.07 1.35 1.87 2.38 2.68 2.90 3.26 4.60 100-yr 0.76 1.22 1,53 2.11 170 3.03 3.28 3.68 5.01 500-yr i 0.96 1.52 1.92 2.65 3.38 3.78 4.09 I 4.56 6.28 _ _ Note: Refer to Figures 4-1 through 4-12 of USDCM Volume 1 for 1 -hr and 6 -hr rainfall depths. Refer to NOAA Atlas 2 Volume Ill isopluvial maps for 6 -hr and 24 -hr rainfall depths. Rainfall depths for durations less than 1 -hr are calculated using Equation 4-4 in USDCM Volume 1. 2. Rainfall Intensity -Duration -Frequency Table Return Period Rainfall Intensit in Inches Per Hour at Time Duration 5 -mm 10 -min 15 -min I 30 -mm 1 -hr 2 -hr 3 -hr 6 -hr 24 -hr 2- r 3.28 2.62 _ 2.20 ' '1.52 0.97 0.60 0.45 0.26 A 0.09 5-yr 4.75 3.79 3.18 2.20 1.40 0.87 0.65 0.38 0.13 10- r 5.71 4.55 3.82 2.64 1.68 1.05 0.78 0.46 0.16 25-yr 6.92 5.52 4.63 3.20 2.04 1.27 0.94 0.56 0.19 50-yr 8.07 6.43 5.40 3.7'3 2.38 1.48 1.10 0.65 0.22 9.14 7.29 _ 6.12 _ 4.23 2.70 1.67 . 1.24 0.74 0..25 100 -err 500-yr 11.47 --- -9.15 7.68 5.31 3.38 2.10 1.56 _ 0.92 0.32 Note Intensity approximated using 1 -hr rainfall depths and Equation 4.3 in USDCIV1 Volume 1. Copy of UD-Rain_v1.03.xlsm, DDF & IDF Tables 1/4/2017, 2:53 PM Depth -Duration -Frequency and Intensity -Duration -Frequency Tables for Colorado Hydrologic Zones I through 4 I I I COLORADO Y :A a a t t *I Mr MI6 s i it { J N. i 0• 1' - - • i .r wrrv_,♦ .Sr Hydrologic Zones (1, 2, 3, or 4) siP 9 Location Map of Sites with UDFCD Boundary 41 els a. a C CC ea } t • 4 .. 2 0 ^ 1 Design Rainfall IDF & DDF Chart w�....,.t..� .._ -., • �.. .ter. Ora. .er..- — i "Wr....- 1`.I��OY... 1 10 ._ -in. _ a . a S._ air .-wit 4Y5a 100 Return Period (years) '2]w.s•R.fy1h.. . 14 I 0 4 Intensity (inches per hour) —I-24-hr depth O 6 -hr depth —9-3-hr depth ' _-. 2 -hr depth -t'-'l-hr depth A 3o -min depth -- 15 -min depth re -10 -min depth 4.-$--5-min depth 24 -hr intensity -6-hr intensity 3 -hr intensity 2 -hr intensity -1-hr intensity -3O-min intensity 15 -min intensity ',10 -min intensity 5 -min intensity Copy of UD-Rain_v1.03.xlsrn, DDF & [OF Tables 1/4/2017, 2:53 PM r. 4.4,+• ►: IY• arsalapagilifFialk I@9U1al1• •-WHIM I, f 1 .s ...r•.• I r C \ i i i 4 i I t I i } !:. . r _ 1 11 3 I I I c mqd Oyr......, e..• a.,.. pw-i 1 " • • WI r •4 kea1.1414 •tr.016r SIW.Sit...SCL7afIRYOa-•..W.-wd,vrsv.•dtpK* YellatM.114 w4ipr a'.$g pj . .Yx-Ni u---- asa.,...Ar.Y..._.F.era..�usrh+..W sear 1,ru•aan..+�w'_r-.l.tY�•�ar.yar 4 dMa_wd.aatlin.i.`\•,•t*&&* ..w .�c� 5r1i �•' - A►4F_w r•••w11Yw' . ••Y_4_4' •3314 S. vim ..._ __ .._.aft ...._.__t ........•..•..5.._. • __.._. .. 7 4 Wes... •••14:121. •A ..� r.1.0 aursiall hat ass. as area 03•04+440.14.maretPA-•• Y•• I 9: I+ rr •V• 3 ..• J • • 4 -•p• PP in..................„ 00,..... 4...a •vrrwla.l1•.••r•u• R e -p W. .• Al 1+ • FR - 4.. •1 I ( 1. ._••.'... • 414.•••+•4' •4.. .•.r•. ha- 'ri..41.s.ma... .. _r - Tub ..r • d: .ate *irk i_k ' M1 tti = 1 c 449•eL • iii L '.•.. ar .... ••w r� • 1. • • nor i rr,_.r..._i_ I 3 1 i • m jI• i� ...,�Jrn °,fit' •.-. 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S es 4 ;Fa.m ••••••••• !Mir mire •••.• • • *la". gesssissagya -me •••• ailMilla•WW491:•~4Seebasii6asst Isssieslaas•WessiairibSiteintba•-. ••••• •••••••••“0•••TIN•241•IlljeK.M. erg e I es se • • 1 rile • 1 *51 • / cs so' Kr yell I • S. gm, ton •14 • • • • vet sks. • • • • • • • • 11. al fog est • 1 „if rtei ttt .114 1 a 01'1 VS 1111 2 52 III' 4 • • N. srf- • • 00 I elk Appendix A Percent Imperviousness Historic Site Area = 454860 ft2 Percent Imperviousness from Table RO-3 Paved 1.00 Existing Site Conditions Gravel 0.40 Paved 0 ft2 Roofs/Concrete 0.90 Packed Gravel 0 ft2 Greenbelts/Landscaping 0.02 Roofs/Cone 0 ft2 Landscaping/Undev. 454860 ft2 = 10.44 AC Percent Imperviousness Existing (Calculated) = I Soil Type C5 = runoff coefficient for 5 -year frequency (from Table 6-4) (*Note Soil Type 0.02 = I A Time of Concentration t, Historic tc = ti+tt Equation 6-2 to = computed time of concentration (minutes) ti = overland (intial) flow time (minutes) tt= channelized flow time (minutes) _ (0.395(1.1 _C5)(Lo.5))/SQo.s3 Equation 6-3 t� = overland (intial) flow time (minutes) O5 = runoff coefficient for 5 -year frequency (from Table 6-4) (*Note Soil Type) Lt = length of overlandflow (ft), not greater than 300' (urban) or 500' (rural) So = average slope along overland flow path (ft/ft) Assume Rural Historic condition 0.02 L = 509.9 eft, not greater than 300' (urban) or 500' (rural) Delta = 13 Ift So = 0.025 ft/ft 5 = 0.02 tt = Lt/((60*K)*(0o.5)) = Lt/60Vt Equation 6-4 tt = channelized flow time (minutes) K = NRCS conveyance factor (Table 6-2) So = average slope along channelized flow path (ft/ft) ti 32.33 minutes Table 6-5 therefore i _ i _ Lt = 206.1 ft Delta = 4.4 Ift i _ 0.0213 ft/ft K= 5 (Table 6-2 4.70 minutes t0 = 37.03 minutes I Time of concentration check Equation 6-5 to = (18 - 15*i) + (Lt/(60*(24*i + 12)(S00•5)) Te of concentration not to exceed equation 6-5 at first design pt to = computed time of concentration (minutes) Lt = length of flow path (ft) i = imperviousness in decimal So = average slope along flow path (ft/ft) i= 0.02 Lt= 716.00 ft Delta =[ 17.4 [ft rt = 23.83 minutes So 0.0243 ft/ft Use t = 23 minutes historic A /if Appendix A Historic Flow Value CIA Equation 6-1 Q5,Historic Q = peak rate of runoff (CFS) C = Runoff coefficient 1= avg intensity of rainfall for a duration equal to given t A= area (AC) C5 = 0.02 15 = 2.66 in/hr. using linear interpolation from Rainfall IDF Tables A► = 10.44 AC 0.56 CFS = 0.05 CF /AC Percent Imperviousness Developed From Table 6-3, I = Soil Type C5 = runoff coefficient for 5 -year frequency (from Table 6-5) (*Note Soil Types 0.11 1= I A Time of Concentration tc Developed to = ti+tt Equation 6-2 to = computed time of concentration (minutes) ti =overland (intial) flow time (minutes) tt= channelized flow time (minutes) ti = (0.395(1.1-05)(Lo.5))f500 33 Equation 6-3 t� = overland (intial) flow time (minutes) C5 = runoff coefficient for 5 -year frequency (from Table 6-4) (*Note Soil Type) Use Urban Lt = length of overlandflow (ft), not greater than 300' (urban) or 500' (rural) = average slope along overland flow path (Mt) nt I = Lt/((60*K)*(So0'5}) = LE/60Vt Equation 6-4 it = channelized flow time (minutes) K = NRCS conveyance factor (Table 6-2) So = average slope along channelized flow path (ft/if) L= Delta = 5 509.9 13 f, not greater than 300' (urban) or 500' (rural) ft 0.025 ft/ft 0.11 Table 6-5 therefore ti 29.64 minutes Lt = 206.1 ft Delta = 4.4 ft 0.0213 ftlff K= 7 tt = 3.36 minutes 33.00 minutes Table 6-2 Appendix A Time of concentration check Equation 6-5 to = (18 - 15*i) + (Lt/(60*(24*i + 12)(S00'5)) To of concentration not to exceed equation 6-5 at first design pt tc = computed time of concentration (minutes) Lt = length of flow path (ft) i = imperviousness in decimal SO = average slope along flow path (ftlft) �_ L{= Delta = 0.11 716.00 ft 17.4 Ift S. = 0.0243 ft/ft tc = 21.58 minutes Use to = 22 Jrninutes developed I Water Quaility Capture Volume Calculations WQCV = a(0.91 i3 -1.19i2+0.781) for 40 hr Release a = 1 Required Storage = (WQCV/1 2)*Area FAA Method 454860 Required WQCV Storage = 100 YR WQCV ft - 0.068 36177 2958 Page SCE -24 Page SQ-24 i = 0,12 10.44 AC AC -ft = ft3 ft° 2958 ft Proposed Stormwater Runoff for 100 -Year, at 20 Minitues Silver Moutain Estates + Off -site flows Q=CIA Equation 6-1 = peak rate of runoff (CFS) C = Runoff coefficient (from Table 6-4) (*Note Soil Type) A C100 = 0.29 I = avg intensity of rainfall for a duration equal to given t = 5.49 inihr. A = area (AC) Off -site Area = 0.33 AC A= 10.44 A± Total runoff Area = 10.77 AC Omaliva = 117.15 CFS or 1.59 CFS/AC Note: 1100 in/hr. using linear interpolation from Rainfall IDF Tables Emercency Overflow Weir Calculations On -site + Off -site 100 yr Overflow Weir = 17.15 CFS = CLH312 Riprap Calculations From Figure 9-39 City of Greeley Eq. 11.4.3.44(1) C = 2.8 L = Length (ft) = 17.5 H = Depth of Flow (ft) = 0.5 = 17.32 CFS <or= 17.15 Use Type "L" Soil Rip -rap Buried From Figure 8-34 D50 = 9 in. Thickness = 2*D50 = 18 in. Chapter 6 Runoff 2.4.E Initial or Overland Flow Time The initial or overland flow time, ti, may be calculated using Equation 6-3: t Where: 03950.1— Cj 033 rs Equation 6-3 t; = overland (initial) flow time (minutes) C'5 = runoff coefficient for 5 -year frequency (from Table 6-4) L = length of overland flow (ft) S0 = average slope along the overland flow path (ft/ft). Equation 6-3 is adequate for distances up to 300 feet in urban areas and 500 feet in rural areas. Note that in a highly urbanized catchment, the overland flow length is typically shorter than 300 feet due to effective man-made drainage systems that collect and convey runoff. 2.4.2 Channelized Flow Time The channelized flow time (travel time) is calculated using the hydraulic properties of the conveyance element. The channelized flow time, 4, is estimated by dividing the length of conveyance by the velocity. The following equation, Equation 6-4 (Guo 2013), can be used to determine the flow velocity in conjunction with Table 6-2 for the conveyance factor. Where: 1, 6OK. S{, 60V, is = channelized flow time (travel time, min) L, = waterway length (ft) = waterway slope (ft/ft) = travel time velocity (ft/sec) _S0 K = NRCS conveyance factor (see Table 6-2). Table 6-2. NRCS Conveyance factors, K Equation 6-4 Type of Land Surface Conveyance Factor, K Heavy meadow 2.5 Tillage/field 5 Short pasture and lawns - 7 Nearly bare ground 10 Grassed waterway 15 Paved areas and shallow paved swales 20 January 2016 Urban Drainage and Flood Control District 6-5 Urban Storm Drainage Criteria Manual Volume 1 J Runoff Chapter 6 The time of concentration, to is the sum of the initial (overland) flow time, t„ and the channelized flow time, t,, as per Equation 6-2. 243 First Design Point Time of Concentration in Urban Catchments Equation 6-4 was solely deterrnined by the waterway characteristics and using a set of empirical formulas. A calibration study between the Rational Method and the Colorado Urban Hydrograph Procedure (CUHP) suggests that the time of concentration shall be the lesser of the values calculated by Equation 6- 2 and Equation 6-5 (Guo and Urbonas 2013). to = 18—l50 + '' Eq uation 6-5 60(24/ + I ),IS, Where: t, = minimum time of concentration for first design point when less than tG from Equation 6-1. Le = length of flow path (ft) = imperviousness (expressed as a decimal) = slope of flow path (ft/ft). Equation 6-5 is the regional time of concentration that warrants the best agreement on peak flow predictions between the Rational Method and CUHP. It was developed using the UDFCD database that includes 295 sample urban catchments under 2-, 5-, 10-, 50, and 100-yr storm events (MacKenzie 2010). It suggests that both initial flow time and channelized flow velocity are directly related to the catchment's imperviousness (Guo and MacKenzie 2013). The first design point is defined as a node where surface runoff enters the storm drain system. For example, all inlets are "first design points" because inlets are designed to accept flow into the storm drain. Typically, but not always, Equation 6-5 will result in a lesser time of concentration atthe first design point and will govern in an urbanized watershed. For subsequent design points, add the travel time for each relevant segment downstream. 2.4.4 Minimum Time of Concentration Use a minimum 4. value of 5 minutes for urbanized areas and a minimum t, value of 10 minutes for areas that are not considered urban. Use minimum values even when calculations result in a lesser time of concentration. 2.4.5 Common Errors in Calculating Time of Concentration A common mistake in urbanized areas is to assume travel velocities that are too slow. Another common error is to not check the runoff peak resulting from only part of the catchment. Sometimes a lower portion of the catchment or a highly impervious area produces a larger peak than that computed for the whole catchment. This error is most often encountered when the catchment is long or the upper portion contains grassy open land and the lower portion is more developed. 6-6 Urban Drainage and Flood Control District January 2016 Urban Storm Drainage Criteria Manual Volume 1 itsfr'9 Runoff Chapter 6 Table 6-3. Recommended percentage imperviousness values Land Use or Surface Characteristics Percentage Imperviousness (%) Business: Downtown Areas 95 Suburban Areas 75 Residential: Single-family 23 acres or larger 12 0,75 — 2.5 20 acres 0.25 0.75 30 acres 0,25 acres or less 45 Apartments 75 Industrial: Light areas 80 Heavy areas 90 Parks, cemeteries 10 i Playgrounds 25 Schools 55 Railroad yard areas 50 k Undeveloped Areas: Historic flow analysis 2 Greenbelts, agricultural 2 Off -site flow analysis (when land use not defined) 45 Streets: Paved 100 Gravel (packed) 40 Drive and walks 90 Roofs 90 Lawns, sandy soil 2 Lawns, clayey soil 2 6-8 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume I January 2016 A- 2,O Table 5-10 Design Storm Frequencies Design Storm Frequency Land use Residential 5 year open space 5 year Commercial 10 year Public buildings 10 year Industrial 10 year Road crossing conducting drainage' Local road 10 year Collector road 25 year Arterial road 50 year Natural drainages 25 year 1 Road overtopping not to exceed 6 inches in the 10 -year event or 18 inches in the 100 -year event it should be noted that storm drainage facilities designed in accordance with the above design storm frequencies will be flooded in storm events exceeding the return period shown. In no case shall a 100 - year design storm cause inundation to any structure or pose a hazard to the public. 5,8.2 Design Criteria The design criteria outlined in Section 5.7 should be followed when designing minor drainage. 5.8.3 Erosion Protection Design Criteria Protecting minor 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 UDFCD Manual (Volume 3) should be used to ensure stability. 5.9 HYDRAULIC STRUCTURES This section presents concise, practical guidelines for the design of hydraulic structures such as bridges, rundowns, etc. For more information regarding the design of hydraulic structures, refer to Chapter 8 of the Weld County Code and the hydraulic structures chapter of the UDFCD Manual (Volume 2). 5.9.1 Design Flows Hydraulic structures need to be designed for the 100 -year design event and other minor design discharges as applicable, 5.9.2 Design Criteria The design criteria for check and drop structures, conduit outlet structures, bridges, transitions and constrictions, bends and confluences, and rundowns should follow the design criteria outlined in the hydraulic structures chapter of the UDFCD Manual (Volume 2). Additionally, bridges must be designed WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA a g e 14 6 A -,2 I Runoff Chapter 6 Table 6-5. Runoff coefficients, c Total or Effective % Imperviousness NRCS iydrolo :lc Soil Group A 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 2% 0.02 0.02 0.02 0.02 0.02 0.17 5% 0.04 0.05 0,05 0.05 0.05 0.19 10% 0.09 0.09 0.09 0.09 0.1 0.23 15% 0.13 0.14 0.14 0.14 0.14 0.28 0.18 0.19 0.19 0.19 0.19 0.32 20% 25% 0.22 0.23 0.24 0.24 0.24 0.36 30% 0.27 0.28 0.28 0.28 0.29 0,4 35% 0.31 0.33 0.33 0.33 0.33 0.44 40% 0.36 0,37 0.38 0.38 0.38 0.48 0,4 0.42 0.42 0.42 0.43 0.52 45% 50% 0.45 0.47 0.47 0.47 i 0,48 0.56 55% 0.49 0.51 0.52 0.52 0.52 0.6 60% 0.53 0.56 0.56 0.57 0.57 0.64 65% 0.58 0.6 0.61 0.61 0.62 0.68 70% 0.62 0.65 0.66 0.66 0.67 0.72 75% 0.67 0.7 0.71 0.71 0.71 0.76 80% 0.71 0,74 0.75 0.76 0.76 0.8 85% 0.76 0.79 0.8 0.8 0.81 0.84 90% 0.8 0.84 0.85 0.85 0.86 0.88 95% 0.85 0.88 0.89 0.9 0.9 0.92 100% 0.89 0.93 0.94 0.94 0.95 0.96 Total or Effective % Im' erviousness NRCS H drolo t is Soil Grows B 2% 0,02 0.02 0.14 0.24 0.38 0.46 5% 0.04 0.05 0.17 0.27 0.39 0.48 10% 0.09 0.09 0.21 0.3 0.42 0.5 15% 0.13 0.14 0.25 0.34 0.45 0.53 20% 0.18 0.19 0.29 0.37 0.48 0.55 25% 0.22 0.23 0.33 0.41 0.51 0.58 30% 0.27 0,28 0.37 0.44 0.54 0.6 35% 0.31 0.33 0.41 0.48 0.57 0.63 40% 0.36 0.37 0.45 0.51 0.6 0.65 45% 0.4 0.42 0.49 0.55 0.63 0.67 50% 0.45 0.47 0.53 0.58 0.66 0.7 55% 0.49 0.51 0.57 0.62 0.69 0.72 60% 0.53 0.56 0.61 0.65 0.72 0.75 65% 0.58 0.6 0.65 0.69 0.75 0.77 70% 0.62 0.65 0,69 0.72 0.78 0.8 75% 0.67 0.7 0.73 0.76 0.81 0.82 80% 0.71 0.74 0.77 0.79 0.84 0.85 85% 0.76 0.79 0.81 0.83 0.87 0.87 90% 0.8 0.84 0.85 0.86 0.89 0.9 95% 0.85 0.88 0.89 0.9 0.92 0.92 100% 0.89 0.93 0.94 0.94 0.95 0.94 7 �r co. VIAL e . el= a o Se Cg: o. Ii C,,: o.21 6-1.0 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 1 A ftr 27 -- January 2016 DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Silver Mountain Estates (Adjusted for C value) Basin iD: ONE - 100 YR POND RELEASE RATE FOR 5 YR STORM (For catchments less than 160 acres only. For larger catchments, use hydrograph routing method) (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) Determination of MINOR Detention Volume Using Modified FAA Method Design information (Input): Catchment Drainage Imperviousness Catchment Drainage Area Predevelopment NRCS Soil Group Return Period for Detention Control Time of Concentration of Watershed Allowable Unit Release Rale One -hour Precipitation Design Rainfall IDF Formula i = CL' P,/(CeeTcj"'C3 Coefficient One Coefficient Two Coefficient Three 1a; A= Type = Tr Tc p1= C2 8.00 10.440 A 5 22 0.05 1.40 28.50 10 0,789 percent acros A. B. C.orD years (2. 5. 10, 25.50. or 100) minutes cfsfacre Inches Determination of Average Outflow from the Basin (Calculated): Runoff Coefficient Inflow Peak Runoff Allowable Peak Outfl0r,4 Rate Mod. Mod. 20' 003 Qp-in 0.81 cfs Op -out = 0.52 cfs FAA Minor Storage Volume = 390 _ cubic foot FAA Minor Storage Volume = 0.009 acre -It c- Enter Rainfall Duration Incremental Increase Value Here (e.g. 6 for 5-Minutos) Rainfall Duration minutes (input) Rainfall Intensity inches / hr (output) 20 2.73 120 _.. 140 160 150• �_ 200 Inflow Volume acre-feet (output) Adjustment Factor "M" (output) Average Outflow cfs (output) 0.024 1SO 052 40 1.82 0.031 611 • -1.40 0,036 roir Tait Das I 0 044 0.77. 0.048 ; 0,80' 0.048 — 0,84 0.040 0.55# 0.051 0 55 0.052 0.55 0.053 0.054 0.055— _ 0.056 . 0.058 0.058 380 0,36 0,050 __ 400 0.35 0.060 Qua_.._._...-. 533 .. 0.00 440 0.32 0.061 0.31 460 _,..._ .� 480- _0.30 505 rt 0.29 _5201 _ 0.28 546___ - - -_D.27 _._ _ 580 _ _ 0.27 580 0.28 __ 800 0.25 _ 220 _ 240 250 0.48 280 -... __ 048 Outflow Volum e acre-feet 0.014 0.70 0.40 0,022 OA ..- 17.66---- -- 4:Sk29- - 0.64 ..._.,.0.33_ 0.037 0.81 an_r 0.32-----•-- 0.' •-� - 0.59 0.31 0.051 0:58 _ 0.57 0.30 _0.058 . 0.30 0.065 -0,018 Storage Volume acre -feel (output1_ 0.009 0.009 i�.Qt)7 0.003 Determination of MAJOR Detention Volume Using Modified FAA Method Design Information (Input': Catchment Drainage Imperviousness Catchment Drainage Area Redevelopment NRCS Soil Group Return Period for Detention Control Time of Concentration of Watershed Allowable Unit Release Rate One -hour Precipitation Design Rainfatl IDF Formula i = D1• P11(C2+TerC2 Coefficient One Coefficient Two Coefficient Three = A= Type = T Tc = R, -� 8.00 10.440 A 100 Cr It C2 C3 = 22 percent acres A.B.C,orD years (2, 5. 1O. 26, 50, or 100) minutes 0.05 cfs/acre 2.70 inches 28.50 10 0.709 Determination of Average Outflow from the Basin (Calculated): Runoff Coefficient C = 0.25 Inflow Peak Runoff Op -in = 13.04 cfs Allowable Peak Outflow Rate Op -out _ 0.52 cfa Mod. FAA Major Storage Volumo = 38,177 cubic feet Mod. FAA Major Storage Volume _ 0,830 acre -ft Rainfall Duration minutes (input.) -0.002 -0, 002 4.007 4 56 5.29 0.073 0.58 0.29 0.080 300._.._. _._.. °0.43_._ 320 0.41 340 0.30 360 0.38- -0.012 0.29 0.087 0.28 0.004 0.54 n1 0.28 0.101 0.54 10,26 0.104E 0.54 I 0.28 Y 0.119 0.53 I 0.28 0.123 0.55 , 0,28 0.1311 0.53 I 0.28 0.137 0.53 I 0.26 0.146 0.53 ; _..� 0.48 -.__ __._• 0.153' :0.53 i 0.27 _ 0.159 0,53 i,---- 00.227,_ _ _ 0.11 0,.082 I 0.52 " 0.27 0.062 0.62 0.27 _ 0.003 - 0,52 - - -4,023 -0.029 -0.035 -0.041 -0.047 820 .,. __..._.... , . 0,26. , .. 040 0.24 860 0.24 • 6110 0.23 aa _7!05_-__.._....._ 0.22 _ 7243 _.. „_ .•_ 0.22 . -746 760 51.21 780 0.39 800 020 820 0.20 844 _ 0.19 860 0,19 880 -• •••••• , MEMO� ., •6.11# -- 900__ 0.18 920 0.16 940Pd.18 96-0 1 0.18 tint SI 17 1000. . 017 1020 '-' _•. 0.17 1040 ` . 0.16 1060 0.16 0,27 0.003 0.52 0.27 0,064 0.52 0.27 —0 -.616-- 0.52 0.27 0.065 0.066 -- 0.066 W I 0.066 _ 1 0.067 0.007 'o.oea 0 068 0.069 0.089 _ 1:611- 0.070 ..._e.. 0.070 0.071 0071 0.071.__ 0.072 0_:072 ._ - 0.073 0073,, 0.073. 0,074 — �.oa"a 5.074 _ 0.075 0:075.. _ 0:078 0.076 Q076_ 0.077 1080 . _ 0.16 ._..... . 1100 -0.16 1120_•._,... 1140 0'.18 0.15 1160 _ 0.15 1150 ._. ....-. 4.15 1200 _ 0.16 1220 0.15 0.62- 0.27 0.52_ 0,27 0.52 ...�_a 0,2a~_ 0.27 - _0,52_` - O.S2 __.. 0.27 _ 0.62 0.27 052 0,27 0.51 0.27 0.51... -0.2_7.- 0.51 0.27 0.260 0.173 0.180 0.168 -0.054 -0,080 -0.006 -0.073 4.079 -0.085 -0.092 _ 4.088 -0.105 - 0.112 _ _4'0,118 -0.125 0.105 -0,131 0.202 0.209 0.210 0224 0.-231•1 _ _ _ _0.238 0.245 y 0.252 o.�s0 267 ___ 0.274 0.281 _0.61 _._ _- _ 0.51 0.27 0.61 _ 0,27 =_ 0.61 _0.27 ___0.51._____. 0.27__^_ O.Si 0,27 0.51 0.27 0.51 0.27 0.51 0.27 0.51..._.. 0 27 0.51 ._..-..._ 027 _ 061 _ 0.27 .-- - _. - - __- ,... 0.51 0.27 0_,51 0 27 __ 0.51 e_._ _,. - 0.27„ 0.51 •027 _ .._ ___............. ......_ _. - .... . 0,51 tt 0 27 0.5-1.- 0.27 0.51........ _ ..13.27._... 1 0.51 ..... 1 017; 0.51 ... fi : 0.27 t 0.439 0.51 ' ' 0.27 ..... 0.447 .......... ,_ ,. 0.298 _. _ 0,303 -.._. 0.3i 0 .._ 0.317 0.324 0531 0.339 _r. 0.348 .. 0.353 0.360 0.387 0.375 .. -.... 0.382_ ..,. , 4l. 389 .. _.. . -0,151 -0.185 -0.172 4.17e - 0.185_ »0.102 _ -0.109 4215 212- -0.219 --0.228 _ - 0.232 -41239 . .. 4.248 ___ 0.253...5. -0.260 -0.267 _0.273._ _ -0,260 4287 -0.294...... 4 301 •"0.308 0.306 • -0.322 0.403 -0.328 0,411 .. -0.335 0.418 •0.342_.. .. 0.-0.#2:i... .#20:i .., -0.349 • .+432 -r....._..._0.356� -0.370 20 40 60 80 Rainfall Intensity inches / hr (output) 5,28 3.51 ._...... 2.89 2.21 .. 100.._ _-. _1:89 120 in 140 1.49 180 1.34 180 1.23 200 1.13 _~ 220 1.06 240 ._. 0.99 - Inflow Volume acre-feet (output) Adjustment Factor (output) Average Outflow cfs (output) Outflow Volume acre-feet {output) 0.378 1.00 0.52 a014 _ 0.505 + 0.581 --0.635 +— 0.713 _ . . 0:743 0._769 0.783 0.814 0.78 0.40 0.022 0.88 0.36 0 020 _ 0,84 4.33 '-- 0,037 0.61 0.32 _ . 0.044 0.59 0.31 -_ _..._..0.051 058-_- -0.30 .0.058 0,67 0.30 0.0_85 -_._.,._._......_-_ ..0.085. 3 . 0.56- . _ 0.56 0.29 _ _. 0.000 0.8341 0.55 __ 0.65-- 0.55 0.28 260 0,93 280 _ 0.88 Sao 5.63 R" 320 __0.79. _ . 340 0.76 360 0.72_. 184-._.--6.69 — 400 _ e - 0,67 420 —0.64 _ 440,._ 0-62 460 _ 0.60 _ 480 0.58 500 0.50 0.868 0.884 • .. 0.89_6 0.912 __.. 0.925 _ _.. �r0.4370.949 .._. 0.980 - - - 0.971 0 983 - _T. 0.992 1.001 520 _ 0.555 540 0.53 560 0.52 580 0.50 600 0.49 1320_,- r 0.48 _ - 640 0.46 , 660 0.45 680 0.44 700 _ 0.43 720 740 _ 0.41 _ 760 0,41 780 - - 0.40 8000.39 820 __ 0.38 - 640 _0! 38 860 0,37 880 0.36 900 .,.. __•, n._._ 0.36 920 0.35 940 i y 134` .. .. ... , 460, .-n Or34 _ .. 980 _-_ 033 1.011 1.026_ 1.037 1.045 1.050 -. 1061..,..,..._ 1,088 1.078 _ .- 1.083 - 1,097 _ 1.103 1.110 -+� 1.116 - _ Ti12 3 1.135_ 1.141 1.140 1.1552 1.958 0..54 0 26 0.29 0.087 0.094 0,101 0.54 0.25 0.109 0.54 _..._ . 0.28 0.116 0 53 - -•-. 0.28 0,123 0,53 0.28 0.130 0.63 0.28 0.137 0.53 0.53 0.53 _ 0.53 0.52 0.52 0.62 _ 0.52 ..0.52 ..,_,_ 0.52 0.52 0.52_ ___.._ 0.52 0.52 052 _- -0.52 _ 452 _ '0y1.52 0-.� .51 Oral ---- l __..,_ Ora 5.51-.._.. 0.51 ___• 0.151 -_ ...._0.51.,_... 0,51 0.51 0.51 0,26 0.145 0.26 0.152 —0.27' 0.159— a.0.27 • 0.173 0.27 _. ., 0,180 0.27 0.199 _.0.27 6.19x5 - 0.27 0.202 •-- 0.27 ' . 0.200 0 27 0.219 - _...~.Q2' . �_ 0.224 �. __ ,... , 0.27 — 0 231 0.27 0.238 --..._ . - 0,27 ._ 0.245 _ 0,27 0.252 0,27 0.260 - 027 0.267 _ 0.27._0.274 0,2x 0.281 ,.... 4_0,27 4.2138. 1:153._.. 1.166 1.174 0,51 _ 1000 0.33 1.170 0.51 - 1020 - �� 0.32 1.184 0.51 1040 0,32 1.100 1120 0,30 414.6. i4.6.. 0 .. . 118_0 J .029 ~1980 ..,.. _ 0,29 1- 1.222 1200 0.28.._ ... j 1.227 1220 _._.�. _...� 0.28 1.201 1.159..... -..0.51..... 1.194 _ 0.51 1.199 _ a51 1.204 0:51 • -1.209_.__ 0.51 - — 1.213 I 051 _. 1.218 0.51 5,51 — 0.51 I 027 0,51 0.27 0,27 0.288.,. . _.._ 0.7 .3a_ 0.27 0.310_ .,.., 0,27 .._.. 0.317 0.27 0.324 0.27 0,331 - 0.27 _ 0,339 . _13,329 --- _ 0.346 _- 0,27 ..... 0.346 -0,153 .,._.....0,27.._ .._,. _ .. 0.360 .. _. . _• •• 0.27 . _. 0.387 - 0_7___. �...5:375 .. _.., , Q7 ,_.._........._4,982 . 0 380 - 027 0.308• _ _ O AD3 0.27 0.411 • 0.27 .... .._ •:.0,418 •... n 27 4,425 0.27 Storage Volume acre-feet (oulputl 0 384 0.483 _ 0.652 • - 0,584 - d.634- ✓ 0.662 ._.0.686 - _ 0.704 0.720 a.12a 0.747 __ 0.757 0.767 0.775 _J _.. 0.782 I 0,789 0.795 _._ ....- 0.800 ▪ _.. 0, 805 . _... 0.$09 0.892 0.816 ' 0.818_ 0 826 0,829 ,.-Fag_ .._ .,_ 0,830 0, 630 tan 17,83© - - -0,830- 0.629 _0,629_, 0,829 `. - 0.928_ _ , 0, - _... Q827 826 -_- 0,825 _ 0.824 __. y Q. 822 . 0.421 0.819 � 0,a17 O,a15 0.814 0.812 0.803 �.._.._Q 300 0.79a 0.7045 0.793 _,. 0.432 0.790 _ . 0.439 0 . .. Mod. FAA Minor StoragR Volume (cubic ft.) = 308 Mod. FAA Major Storage Volume (cubic ft.) Mod. FAA Minor Storage Volume (acre -ft.) = 0.0991 Mod. FAA Major Storage Volume (acre -ft-) = UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.34, Released November 2013 36,177 0,8305 UD-Detention_Mod FFA C—adjusled_v2.34 2016-036.x1*., Modified FAA 2/23/2017, 3:26 PM DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Silver Mountain Estates (Adjusted for C value) Basin ID: ONE -100 YR POND RELEASE RATE FOR 5 YR STORM UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.34, Released November 2013 UD-Detention_Mod FFA G adjusted_v2.34 2016-036.4s. Modifix.d FAA 2l2:2017, 3:28 PM DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Silver Mountain Estates (Not Used in DemiIn Basin ID: ONE -100 YR POND RELEASE RATE FOR S YR STORM (For catchments less than 160 acres only. For larger catchments, use hydrograph routing method] (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) _ — Determination of MINOR Detention Volume Using Modified FAA Method ; _ _ Determination of MAJOR Detention Volume Using Modified FAA Method Desicln Informationlincutt I Design infofinag,on (Inptit): catchment Drainage Imperviousness !, = 12.OO percent ! Catchment Drainage Imperviousness I, = 12.00 percent Calchrnent Drainage Area A = 10.440 acres Catchment Drainage Area A = 1_0.440(1 acres Predevelopment NRCS Soil Group Type = A A, B, C. or 0 _ _- Predeveloprnent NRCS Soil' Group Type = A A B. C. or D Return Period for Detention Control T ; 5 years (2, 5, 10, 25, 50, or 100) Return Period for Detention Control T = 100 years (2. 5, 10, 25, a0, or 1O0) Time of Concentration of Watershed Tc = 2O minutes I Time of Concentration of Watershed Tc o 20 minutes Allowable Unit Release Rale q = _ O.O5 cfslacre Allowable Unit Release Rate q = 0,05 cfsfacre One -hour Precipitation P, = 1.40 inches One -hour Precipitation P, = 2.70 inches Design Rainfall IDF Formula i r Cy' Pii(Cyrrer3 ! Design Rainfall IDF Formula i = Cr' P,i(C3+Ta"C3 Coefficient. One Ci = 28.50 Coefficient One C, = 2,8.60 Coefficient Two C2 = 10 Coefficient Two Cm= 10 Coefficient Throe C3 A 0.789 Coefficient Three C3 ; 0.789 Determined yn of Average Outflowfrom the Basin tcalculatedii Determination 0 Averake OUtfldwfrom the Basin Calculated,; Runoff Coefficient C = .. 0.0₹t Runoff Coefficient C = 0.29 Inflow Peak Runoff Op -in =___ 2_28 _ _ _ cfs Inflow Peak Runoff 4p -in = 15.02 cis Allowable Peak Outflow Rate tip -out =. 0,52 cfs I Allowable Peak Outflow Rate Op -out = 032 cfs Mod. FAA Minor Storage Volume = 3,027_ cubic foot Mod. FAA Major Storage Volume z 43.881 cubic fret Mod. FAA Mirror Storage Volume = 0.089 acre -ft Mod. FAA Major Storage Volume = 1.001 acre -ft 20 <_ Enter Rainfall Duration Incremental Increase Value Here a-.. 5 for 5 -Minutes _ Rainfall Duration ' miriules in•ut Rainfall Intensity inches / hr out,ut Inflow Volume acre-feet ou -ut Adjustment Factor "m+ cutout Average Outflow cfs out•ut Outflow l'-dume acre-feet ou•ut Storage Volume acre-feet ou W Rainfall Duration minutes , n•ut Rainfall Intensity Inches / hr outs I Inflow Volume acre feel oul•ut Adjustment Factor "m" outeut Average Outflow cfs ou • t Outflow Volume acre -feel out •ut acre-feet Storage Volume S oil -ul 20 2.73 0.003 - 1 00 0 52 0.1314 0.048 20 528 043$ 1.00 0.62 0.014 0,424 40 1.82 .,.0.084 I 0.75 O,39 } _ _ 0.022_ I 0,062 40 3,51 - 1 0.586 0.75 0,39 p 0.022 0,664 60 1.40 i 80 ! 1.15 ' 0,096 • a105 i 0.07 0.63 • 0.35 ! 0.33 i 0.029 0 636 0.068 0.06►0 60 88 I 2.89 2.21 0.674 .. 6.737 0.67 0.63 0,35 1 0.33 0.029 0.845 0.038 0,701 100 O,Sl6 0.113 080 4 v 0.31 I 0043 0.069 100 1.89 0.787 1 O.61 0,31 0.043 0.743 120 0.06 0.116 4.58 00.34 6.650 0.088 120 i 1:85 1_0.0.827 0.027 0.58 i 0.30 0.050 0.777 140 0.77 0.123 037 0.30 , 0,058 0 D88 14D 1.48 0.8'82_ 0,57 1• 0 O. 0.058 0.805 180 0.69 I _ 0.128 0.56 1 0.29 �„ . 0,065 0.063 180 1.34 _ t.. 0.803 f 0.55 t 0.29 I 0,066 0.828 180 .... 4,64 j. -10.132 i.. 0.56 _. d ...._._ 0,29 , f 0,072 1 _ 0.000 180. 1.23.-.. ..1.. 0_ '20 . ... 0-58 0.29 .., j ._ 0.072 0.848 240 d 0.59 j 0.135• 17.56 81.29 0,079 0.056 200 1.13 I 0.944 0 55 I 0 29 0.079 i 0,865 220 240 260 I 0.55 I 0:51 .._. , _...-....._. 0.48 I 0.138 I 0,141 .._ _ y.... 0.144 .. 0.55 0.54 I . 0.54 I 0 28 0.28 _ 0.28 01086 0.093 _ M 0.108 j .- 0,052 I 0.048 0.043 220 240 280 1.05 00_ .99 0.93 I 0.187 0.i68 l 1.007 I 0.55 0.54 0.54 f 0.28 4,28 i 0.28 0.086 P 0.003 1 0.101 0.881 0.59ii. _ 05. 1 4.908 260 0.46 0147 0.54 I 0.28 0.108 0.039 280 0.8 1.025 I 0.54 I 0.28 i 0 108 • • I. 0.917 300 320 0.43( 041 I 0,.14-9- 0.151 4.53 I I 0.53 1 0.2$ 0,28 0.115 0.122 • .. . _0.034 k 0,029 300 320 46 1 .83 I 0.79 1.042 , 1.058 l 0.53 0.53 0 28 0 28 1 0.115 .0.12 0,927 h 340 0 39 O.153 0.53 I • 0,28 0,120 4 0.024 340 q 0.76 I 1.073 I y0.53 1 0.28 _ 0.129 , .0.936 } 0.044 360 j 0,38 0.158 0,'53 0.28 . 0.137 -0.144 0.0-19 360 1 0/'2 1.087 0.53 .. t 0.28 0.137 0951..... 380 0 e6 0.157 0.53 0,27 I 0 014 ; 380 , 0.89 1.1111 0.144 0.957 400 420 0 0.35 4,33 0.1;9 0.101 0,553 0.52 p • ,27 0 0.27 00.151 0.158 0.008 _ 0.003 400 420 0.67 l 0.840. 1 1.114 L 1.127 ............................- 0.53 00 52 0.27 0.27 - t 0.151 0.158 `0.963 O.O69 440 460 0.x!2 0.31 0.183 _ 0.185 0.52 ' 0.52 II. 0,27 0 27 1 0.186 I I 00.173 -0.002 -0.006 ... 440 1 461}• 0.62 ~ . • 0.60• 1.139 1.. 1.150 0.52 0.52' - tD 27 1 O.27 I {7 165 0.173 0,973 n 978 480 l 0.30 1 0.166 _ f 0.52 - 1 0.27 I 0.180 1 -0 014 480 0.58 1.1$2 0.27 0.180 0.988? 50!1 520 540 I {3.29 0,28 0.27 • 0.188 �I o:teg 0.171 •0,52 eta- 52 . - 0.52 . t 0.27 0,27 0,27 0.187 0.194 0.201 -4 p1,a -4.025 .0.-6,1-1 ._ son 520 ... 540 - a.s8 0.55••• 0,53 1.172 1.1083-•-•--- 1,193 .......0:52 0.�2 , .- • 04x2 I 0.52 O.27 O.27 0.27 • ts.ie7 0.194 1 0.201 0.986 0,989 0.9 560 580 _ • -- .t 0.27 I 0.2_8 j 0.112... .i._ ,_ 0.173 • 0:5 _.._.. 0,52 0.27 0,27 _ .. 0.2olt... 0.214 r -0.036'.......—.,560__ -0.042 580_ j _ 0.52.2. 0.50 L^..~1203 • 1.212 ..—......�'y..!_ 0.52 , _ .a._.__... 0,27 .. 0,200 0.218 ... .._. 0.0$4 0,997 _ 000 0.25 _ 0.52 0.27... 0:223• T 0-.648 . ^ 800 , _.el 0,49 _T _0,62 4 1.222 0.52 -..1. _0,27 _._. 027 0,223 .__ . 820 - - - - 4.72 _ _._0.175 .. 8.17$ ---5. _.... Q 52 _ ' - ..©:27 _ .... _-..,.0.2-10.- ,.1 .._ 20-.054 _.. - .. e-- 0_ . _.. - _ . 0,41x -• -_ _._�_ . _ 1.23_1 ^ I _... On .,•_ t� .,.. ''0.27 ... .._ 0,+30 0.998 . 1.000 640 850 . . 0.24 r 0.24 0.177 0.1.78 ., 0.52 ._. _.I__... 0,27 I 0.52 I 0.27 0.237 -- i 0.244 -0,000_ -0.088 _ 840 860. 0.48-:........1.-_'.-..., 045 1.239 1.248 ... 0,522 1 0.52 • - - - - 17,27 .,. _ 47 27 0 0237 6.244 . . _ -1.0022.. 1 0n3 _ _8130 y - I- 000 720 I -__ - 0•.23 0,22 } 0.22 1 0.180 0 181 I 0.182• 0.51- J - - 0,27 0.51 I 0.27 I 0.51 I 0.27 .. 0.252 ... 0.259 i 0 250 �. -0.072 -0,07$0. -0.084 680 700 p 720 I _ 0= .... 0.41 0.42 ..W 1258 1.204 1 272 t' 51 .1_ 0,51 I 0,51 _ f 0.27 - •- 0.27 _ 0.27 - 0.252 - 0,259 �._ 0.266 1.004:. 1,005 1.006 . , - r. .... ... -- _._ .. _ . _ . ___ _. _... _ _ ._. _ .2273 740 0.22 0.183 0.61 0.27 0,273 -0.0170 740 0.41 1.280 0.61 0.27 1.007 700 6 780 p 0,21 0.21 0.184 0.185 0,51 t 0,27 1 -, 0.61 0.27 0.280 0.288 -i . -0.006 -0.102 760 . 780 _ {1.41 ,1 0.40 1.287 1.295 t .0 51 0 91 w0._ _ 0.27 - 0.27 0.250 0.268 t. __ 1.007 1.007 600 520 ' D.20 _... 0.20 _ 0156 0.187 p 0.51 041 : I 0.27 0.27a. 0.295 I 0.302 -0.109 -0.115 800 . 820 i - 0.39 O _'° _ 1202 .1.309, . _ _ 0.51 .' 1 -0-51 _ 0:27. _._ .. 9 . l ^0.302 - - - 0.7 1.007 1.007 840 560 i 880 I -_- 900 0.113 0.19 47 19 0:111 0.168 I 0.189 0190 - _. ...,.. 0,1'91 0.51 0.51 0.5.1 0.51 I 0.27 I I 0.27 i i 0.27 • I 0.277h._ ;jilt 0.318 It 0,324 t 331 � -0.121 '0 127 -0.133 ._...- -0,140 8430 680 860 ..... $00 0,38 ! 0.37 • 0.38 ..._ 0, 3$ I 11 316 1,323 1.330 1 1, 33$ � . 0.51 _ 0.51 -_...- ._ 4 61 'ail 0 21- _ _1 0e 27 0 27 - . - - 0 27 _2.27. 0.309 1- 0.316 ` ; 0.324 _ .. 3 8.3 31 .. 1,007 1.OO7 - -'160.6_ '1200$ e._--. 920 6413 I 950 0 18 0.18 0.163 , 0,192 i' 0.193 0.194 O.51 0.51 0 51 1 , 0.27 I 0.27 i 0.27 0330 - ...... 0.345 1 n 352 0.146 0.152 , -0.158 024 ...,..9040 _see- 035 . _ 0:34 .. I 41.34 ' 1,343 ._1,349 . 1.355 } 04,51 _ I. 0. 0,51 0.51 .. 0.27 0.27 _ 0.27 .� 0.338 0.34E O.352 , , 'i 005 1.0 04 1.003 980 1060 _ 1020 I 1040 1060 ; 1080 _ 17 0,195 0,17 0,196 I 0.17 0.15 _ 0.16 *0.187 I _ 0.16 0,1013 s 0.16 n 0.109 i 0.51 0.2'7 i 0.51 • 0.27 ••i 0.51 6.277 _.}..._ 0.51 0,27 i _ 0 F1 0.27 0,51 i 0,27 0, 60 0.367 i 0,371 1 0.381 , 0.3$8 _ 1 0.385 •0.1065 -0.171 -0.177 -0.154 _ -0.190 -0.1417 960 t 0.33 1000__ , 0.53 1020 .. . 0.32 I - - - 1040 0.32 I 1060 0.31 i 1080 I 0.31 1.382 I 1.368 i ....1.374 _ I ------....-..�.. 1.379 . I 1.385 j 1.391 1 031 0.51 . 0.51 I .....,.....__ . . 0.51_ 0.51 0.51 0,27 0.27 0.27 0 27 0.27 I O 27 +" 380 0.367 0.374 -- 0.381 0.386 0.395 ! 1,002 i OO1 141041• .... 0.9'8 0-fl97 0.00 1100 , 1120 I 0.16 0.16 I 0.200 0,51 ► 0.27 :. 0.403 1 0.201 ! 0.51 r 0 27' I 0.410 .. � I -0.203 .. -0,209 1100 I 0.'30 _ 1120 0-30 I 1.390 i 1.402 • 0 51 0 27 0.51 0.27 u 0.403 I 6.994 0.410 I 0.092 1140 1160 0.15 - 0.15 0,201 0_.51 I 0.27 0 417 0-202 {. •00.51 1 0.27 I 0.424 -0.216 .-, -0.222• 1140 I _ 1180 _ 1 0.30 I 0.29 1.407 1.413 I 0.51 f 0.27 . _ 0.51 0 27 ^. 0.417 0.990 0.424 fa ! 1180 0.15 i - _ 0,203 1 0.51 0 _ _ I _ .27 _ _ I 0,431 -;.229 - 118O 0 • 1.418 I 0.51 0.2 7 -0.51 0 431 0.066 12O0 1220 t 0.15 0.15 • 0,204 0.204 0,51 O.27 0.511 0.27 0,438 I0229 0.448 .-0.235 -0.241 1200 122O s 0.28 s 0.28 I 1.4223 1 1.428 _. i 0.27 - 0.51 i 0.27 0.430 n 9.-E15V 0.446 ? 6`.982 Mod• FAA Minor Storage Volume (cubic ft.) = 3,027 Mod. FAA Major Storage Volume (titbit ft,} Mod. FM Minor Storage Volume (acre -ft.) r 0.0695 Mod. FAA Major Storage Volume (acre -Ft.} = UDFCD DETENTION BASIN VOLUME ESTIMAT[NG WORKBOOK Version 2.34, Released November 2013 43,881 1.O074 UC-DatentionMod FFA_v2.34 2016-036.xis. Modified FAA 1/5/2017. 1:27 PM NMI DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Silver Mountain Estates (Not Used in Design) Basin ID: ONE -100 YR POND RELEASE RATE FOR 5 YR STORM Inflow and Outflow Volumes vs. Rainfall Duration 1.6 1.4 I 1.2 Volume (acre-feet) 0.8 0.6 0.4 0.2 0 0 0 earns 0 0 0 ■aaaate- OOO 0 S OOOOOOOOO(h 200 400 600 800 Duration (Minutes) —. Minor Ste .n Inflow Volume +II ref 3t0nn.Merkur! Whims 1000 1200 1400 o Minot Sian 8wnye Vvkan■ + Molar Sion Wks., Wrist". -.& Mai 61SimtmCutllow Vduhe • M,(er Slonn Stone U&wni J UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.34, Released November 2013 UD-DetenVuon_Mod FFA_v2.34 2016-Q36 xis. Modified FAA 1(52017, 1:27 PM Appendix A Pond Volume Calculations Average Area Method = ((Al + A2)I2) * Stage Depth = Stage Volume (CF) Elevation Contour Contour Acculative Acculative (NAVD 29) Area 1 (112) Area 2 (ft) Area (ft) East Volume of Volume East side West side + West Stage (ft3) (ft3) Weir Elevation = 4845.5 4845.5 4845.4 4845.3 4845.2 4845.1 4845.0 4844.9 4844.8 4844.7 4844.6 4844.5 4844.4 48]44.3] 4844.2 4844.1 4844.0 4843.9 4843.8 4843.7 4843.6 4843.5 4843.4 4843.3 4843.2 4843.1 4843.0 4842.9 4842.8 18756.31 18291.12 17901.50 17518.52 17142.47 16780.78 16427.70 16080.04 15736.4 15397.51 15061.18 14731.65 14411.06 14092.26 13777.41 13472.86 13155.'15 12862.51 12570.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 14272.16 13657.66 13077.73 12572.61 12147.12 11836.88 11561.89 11293.86 11029.07 10768.71 10511.57 10262.28 /' 10014.96 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 33028.47 31948.78 30979.23 30091.13 29289.59 28617.66 27989.59 27373.90 2676531 26166.22 25572.75 24993.93 24426.02 14092.26 13777.41 13472.86 13155.15 12862.51 12570.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3248.9 3146.4 3053.5 2969.0 2895.4 2830.4 2768.2 2707.0 2646.6 2586.9 2528.3 2471.0 1925,9 1393.5 1362.5 1331.4 1300.9 1271.7 628.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 43066.0 39817.1 36670.7 33617.2 30648.1 27752.8 24922.4 22154.2 19447.3 16800.7 , 14213.7 11685.4 9214.4 7288.5 5895.0 4532.5 3201.1 1900.2 628.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Required Detention equals 39135 CF volume @ 4845.5 = 43066 CF over sized by 10% Required WCICV equals 2958 CF volume @ 4843.9 = 3201 CF Over sized by 8.2% Appendix A WQCV Release Plate Design Point 1 ,Q=CdA(2gh).5 Eq. 11.4.3.B City of Greeley Storm Drainage Volume I I (orifice flow) Where: Q = flow (CFS) A= area (ft2) A=H*1111 g = gravitational constant = 32.2 ft/sec2 h = head on orifice measured from centerline of opening (ft) Cd = 0,6 Q = CL(H)3/2 City of Greeley Eq.11..4.3.A(1) (weir Flow) Where: Q = flow (CFS) C = weir coefficient (see table 11-1) C = 4.0 L = horizontal length (ft) L = 0.08 ft H = total energy head (ft) H = flow depth ft WQCV depth = H = 1.50 in = 0.1250 ft 1.00 in = 0.0833 ft A = 0.0104 ft2 Stage Qavg Time (min) Volume Depth (ft) Q; (CFS) of Q1 (CFS) of (CFS) of Time (sec) to to release Accumulative Elevation (CF) Stage Stage Stage release stage stage Time (min.) 4844.010 4844.0 4843.9 4843.8 4843.7 1300.9 1271.7 628.5 o.o 0.310 0.30 0.20 0.10 0.00 Flow rate of WQCV Plate @ 100 year Water Elevation 0,057534 0.054772 0.0562 23167 1 386.1 386.1 0.054772 0.029814 0.0423 30068 501.1 1020.3 0.029814 0.010541 0.0202 31150 519.2 c 519.2 0.010541 0.000000 0.0053 0 0.0 519.2 I 2444,7 I _ Total Time (hr) = 40.7 Flow Rate Through WQ Release orifice at full pond condition Elevation Top 4845.5 Bottom 4843.7 Total Pondi ng Depth 1.8 ft Release Rate = 0.10 CFS Flow Rate Total Allowable Release Rate = 0.52 CFS Allowable Detention Orifice Release Rate Total Allowable release rate - WQ Release at Full Pond Condition Detention Orifice Release = 0.42 CFS Detention Release Orifice Q=CdA(2gh ,5 Eq. 11.4.3.B City of Greeley Storm Drainage Volume ll (orifice flow) Where: Q = flow (CFS) A = area (ft) A = 3.14*r2 g = gravitational constant = 32.2 ft/sec2 h = head on orifice measured from centerline of opening (ft) Cd= 0.6 h = 1,4 ft r = 1.84 in. A= 0.07 ft2 fWDentionOrifice Flow Rate = 0.42 CFS i Diameter = 3.68 Aae,:28) 0,15 ft in. use = 3 - 21/32 in. CIRCULAR CONDUIT FLOW (Normal & Critical Depth Computation) i • Project: Silver Mt. Estates Pipe ID: Detention Pond Outlet Pipe 4 Fw Arm angetee d .r — I) f Design Information (Input) Pipe Invert Slope Pipe Manning's n -value Pipe Diameter Design discharge So _ n= D= '- 0.0635 0.0120 8.00 0.52 ft/ft inches cfs I' ice :" Full -flow Capacity (Calculated) 'Full -flow area Full -flow wetted perimeter Half Central Angle Full -flow capacity Calculation of Normal Flow Condition Half Central Angle (O<Theta<3.14) Flow area Top width Wetted perimeter Flow depth Flowvelocity Discharge Percent Full Flow Normal Depth Froude Number Calculation of Critical Flow Condition Half Central Angle (OcTheta-c<3.14) Critical flow area Critical top width Critical flow depth Critical flow velocity Critical Depth Froude Number Af M Pf = Theta = Qf = Theta = An Tn = Pn = Yn = Vn Qn= Flow = Fri, = Theta -c = Ac = Tc = Yc = Vc = Frc 0.35 2,09 3.14 3.31 1.09 0.08 0.59 0.73 0.18 6.91 0.52 15.7% 3,41 1.58 0.18 0.67 0.34 2.93 1.00 sg ft ft radians cfs radians sg ft ft ft ft fps cfs of full flow supercritical radians sg ft ft ft fps Copy of UD-Culvert v3.02.xlsm, Pipe 3/13/2017, 3:11 PM Chapter 9 Hydraulic Structures 1.4 Vt/H Use #alp instead of H whenever culvert has supercritical flow in the barrel. **Use Type L for a distance of 3Ff downstream. Figure 9-39. Riprap erosion protection at rectangular conduit outlet (valid for ()Mg -1m ≤ .0) En ens 0 a . Chr- 17132 ors 17.5 re A 0051 (R/tAD 0.C i 4e Open Channels Chapter 8 CHANNEL BED Row DESIGN WSE f RIPRAP OR SOIL RIPRAP NOT STEEPER THAN 2.5H:1V V S MIN (5' MIN FOR SOILS THAT ARE NOT COHESIVE) e • f , "- h t •f "N;? ti e II • ;�4 "1-' •••• rn --• I 1 • F f ' •. •. _ 1 % -- f ea? tiek he f .. 1 f }• f" 1• _ e 0j ks •P ` -1 f�. / •YPP\' + Ott Sy eiJ\ l �F,f9 i/ f. i • i1F " X M• i S ; i J • i+� i L. 1, 1 \ P • ( t .1 k_' • ,r tiff 1_ •• Ni •�___- t"4• r #11:\:((://14:?" ' /' • ' ti: ‘).0„›, /..N% z P y *f SS7+:CS:111C7f<v:/:\ GRANULAR BEDDING, REQUIRED FOR RIPRAP. ALSO REQUIRED FOR SOIL RIPRAP WHEN SPECIFICIED RIPRAP DESIGNATION SMALLER GIVEN WEIGHT SIZE THAN BY INTERMEDIATE DIMENSION (INCHES) D50* (INCHES) ROCK TYPE VL 70 50 35 2 100 10 70i 50 12 9 6 2 6 - - - - 70 - 100 15 T P L 50 - 70 35 - 50 12 9 2 - 10 3 k 70- 1O0 21 TYPE I 50 - 70 35 - 50 18 12 1 2 - 10 4 70 100 30 - TYPE H 50 - 70 35 -- 50 18 24 18 2 10 6 — ROCK SIZE *D50 = MEAN Figure 8-34. Riprap and soil riprap placement and gradation (part 1 of 3) 8-76 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 1 A .5." 3 January 2016 Chapter 8 Open Channels SOIL RIPRAP NOTES: 1. ELEVATION TOLERANCES FOR THE SOIL RIPRAP SHALL BE 0.10 FEET, THICKNESS OF SOIL RIPRAP SHALL BE NO LESS THAN THICKNESS SHOWN AND NO MORE THAN 2 -INCHES GREATER THAN THE THICKNESS SHOWN. 2 WHERE "SOIL RIPRAPP IS DESIGNATED ON THE CONTRACT DRAWINGS, RIPRAP VOIDS ARE TO BE FILLED WITH NATIVE SOIL. THE RIPRAP SHALL BE PRE -MIXED WITH THE NATIVE SOIL AT THE FOLLOWING PROPORTIONS BY VOLUME: 65PERCENT RIPRAP AND 35 PERCENT SOIL. THE SOIL USED FOR MIXING SHALL BE NATIVE TOPSOIL AND SHALL HAVE A MINIMUM FINES CONTENT OF 15 PERCENT. THE SOIL RIPRAP SHALL BE INSTALLED IN A MANNER THAT RESULTS IN A DENSE, INTERLOCKED LAYER OF RIPRAP WITH RIPRAP VOIDS FILLED COMPLLILLY WITH SOIL. SEGREGATION OF MATERIALS SHALL BE AVOIDED AND IN NO CASE SHALL THE COMBINED MATERIAL CONSIST PRIMARILY OF SOIL; THE DENSITY AND INTERLOCKING NATURE OF RIPRAP IN THE MIXED MATERIAL SHALL ESSENTIALLY BE THE SAME AS IF THE RIPRAP WAS PLACED WITHOUT SOIL. 3. WHERE SPECIFIED (TYPICALLY AS "BURIED SOIL RIPRAP"), A SURFACE LAYER OF TOPSOIL SHALL BE PLACED OVER THE SOIL RIPRAP ACCORDING TO THE THICKNESS SPECIFIED ON THE CONTRACT DRAWINGS. THE TOPSOIL SURFACE LAYER SHALL BE COMPACTED TO APPROXIMATELY 85% OF MAXIMUM DENSITY AND WITHIN TWO PERCENTAGE POINTS OF OPTIMUM MOISTURE IN ACCORDANCE WITH ASTM D698, TOPSOIL SHALL BE ADDED TO ANY AREAS THAT SL 1 LE. 4. ALL SOIL RIPRAP THAT IS BURIED WITH TOPSOIL SHALL BE REVIEWED AND APPROVED BY THE ENGINEER PRIOR TO ANY TOPSOIL PLACEMENT. GRADATION FOR GRANULAR BEDDING U.S. STANDARD SIEVE SIZE PERCENT PASSING BY WEIGHT TYPE I COOT SECT. 703.01 TYPE II COOT SECT. 703.09 CLASS A 3 INCHES - 90 - 100 1 INCHES - - 34 INCHES 20 - 90 - % INCHES 100 - #4 95 - 100 0 - 20 45 80 #16 - #50 10 30 - - #100 2 - 10 - #200 0 2 0 3 - - RIPRAP BEDDING Figure 8-34. Riprap and soil riprap placement and gradation (part 2 of 3) January 2016 Urban Drainage and Flood Control District 8-77 Urban Storm Drainage Criteria Manual Volume 1 A-- 3 ez-- Open Channels Chapter 8 THICKNESS REQUIREMENTS FOR GRANULAR BEDDING RIPRAP DESIGNATION MINIMUM BEDDING THICKNESS (INCHES) FINE-GRAINED SOILS 1 COARSE GRAINED SOILS 2 TYPE I (LOWER LAYER) TYPE II (UPPER LAYER) TYPE II VL D50 = 6 IN ) 4 L (D50 = 9 I N) 4 4 8 4 4 6 M (D50= 12 IN) 4 6 8 H (D50 = 18 IN) VH (D50 = 24 IN) 4 6 8 NOTES: 1. MAY SUBSTITUTE ONE 12 -INCH LAYER OF TYPE II BEDDING. THE SUBSTITUTION OF ONE LAYER OF TYPE II BEDDING SHALL NOT BE PERMITTED AT DROP STRUCTURES. THE USE OF A COMBINATION OF FILTER FABRIC AND TYPE II BEDDING AT DROP STRUCTURES IS ACCEPTABLE. 2. FIFTY PERCENT OR MORE BY WIGHT RETAINED ON THE #40 SIEVE. Figure 8-34. Riprap and soil riprap placement and gradation (part 3 of 3) 8-78 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 1 it4 n3' January 2016 Property Report Page 1 oft WELD COUNTY Property Report PROPERTY PORTAL Technical Support: (970) 400-2500 Account: R6777967 October 19, 2016 Account Information Account Parcel S ace p Type Account Tax Year Buildings Actual Value Assessed Value R6777967 131105100007 0 Agricultural 2016 9,760 2,830 Legal PT E2NE4 5-2-67 PT LOT B RE -4884 LYING N OF LUPTON MEADOWS DITCH BEG NE COR N89D41'W 824' S0D21'W 367' $66D49'E 66' S43D03'E 111' S36D04'E 72' S58D09'E 26' S87D33'E 84' S76O06'E 98' S55D31'E 75' S44D44`E 138' $64D30'E 105' N82D52'E 30' N36D19'E 50' N13D06'E 98' N33D02'E 60' N43D18'E 79' S70D12'E 19' NOD03'E 515' TPOB Subdivision Block Lot Land Economic Area 3231 FIRESTONE Property Address Property City Zip Section Township Range 05 02 67 Owner(s) Account Owner Name Address R6777967 HEIN RICHARD L PO BOX 649 FORT LUPTON, CO 806210649 Valuation Information Ars r httns:i/provertyrevort.co. eld.co.us/ account=86777967 10/19/2016 Property Report Page 2 of 2 Type Code Description Actual Value Assessed Value Acres Land SqFt Land 4117 FLOOD LAID IRRIGATED -AGRICULTURAL 9,760 2,830 10.786 469,838 Totals - - 9,760 2,830 10.786 469,838 E _ Copyright © 2016 Weld County, Colorado. All rights reserved. Privacy Policy & Disclaimer I Accessibility Information - ce https://propertyrcport,.co. eld.co.usl?account=86777967 10/19/2016 GEOID HEIGHT — —17.930 (meters) DYNAMIC HEIGHT — 1466.667 (meters) MODELED GRAVITY — 979,689.1 (mgal) VERT ORDER NGS Data Sheet — Z329 The NGS Data Sheet See file dsdata.txt for more information about the datasheet. PROGRAM 1 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 datasheet95, VERSION = 8.8 National Geodetic Survey, Retrieval Date = MAY 17, 2016 *********************************************************************** DESIGNATION - PID STATE/COUNTY COUNTRY USGS QUAD Z 329 LL0249 COIWELD US PLATTEVILLE (1975) *CURRENT SURVEY CONTROL LL0249* NAD 83(1986) POSITION- 40 12 14.0 HD HELD2 LL0249* NAVD 88 ORTHO HEIGHT - ADJUSTED LL0249 LL0249 GEOID128 2S LL0249 COMP LL0249 NAVD 88 LL0249 LL0249 LL0249 LL0249.The horizontal coordinates were established by autonomous hand held GPS LL0249.observations and have an estimated accuracy of +/— 10 meters. LL0249. LL0249.The orthometric height was determined by differential leveling and LL0249.adjusted by the NATIONAL GEODETIC SURVEY LL0249,in June 1991. LL0249 LL0249.Significant digits in the geoid height do not necessarily reflect accuracy. LL0249.GEOID 1 28 height accuracy estimate available here. Page 1 (N) 104 52 03.1 1467.967 (meters) (W) 4816.16 (feet) FIRST CLASS II 4811.89 (feet) NGS Data Sheet — Z329 LL0249 LL0249.The dynamic height is computed by dividing the NAVD 88 LL0249.geopotential number by the normal gravity value computed on the LL0249.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 LL0249.degrees latitude (g = 980.6199 gals.). LL0249 LL0249.The modeled gravity was interpolated from observed gravity values. LL0249 LL0249; Accuracy LL0249;SPC CO N HH2 GPS) LL0249 LL0249 LL0249 LL0249 1 2 LL0249 LL0249.Superseded values are not recommended for survey contro . LL0249 LL0249.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. LL0249.See file dsdata.txt to determine how the superseded data were derived. LL0249 LL0249_U.S. NATIONAL GRID SPATIAL ADDRESS: 1 3TEE 1 1 27450395(NAD 83) LL0249 LL0249_MARKER: DB = BENCH MARK DISK LL0249 SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT North East Units Estimated 401 ,651. 968,247. MT (-l-/ 10 meters SUPERSEDED SURVEY CONTROL NGVD 29 (7?/??/??) 1467.060 (m) LL0249 STAMPING: Z 329 1951 LL0249 MARK LOGO: CGS LL0249_STABILITY: C = MAY HOLD, BUT OF LL0249+STABILITY: SURFACE MOTION LL0249_SATELLITE: THE SITE LOCATION WAS LL0249+SATELLITE: SATELLITE OBSERVATIONS LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 LL0249 HISTORY HISTORY HISTORY HISTORY HISTORY HISTORY 4813.18 (f) ADJUSTED TYPE COMMONLY SUBJECT TO REPORTED AS SUITABLE FOR August 10, 2005 Date Condition 1951 1977 1983 MONUMENTED POOR GOOD 20040808 GOOD — 20050810 GOOD Report By CGS NGS NGS USPSQD USPSQD STATION DESCRIPTION Page 2 NGS Data Sheet — Z329 LL0249'DESCRIBED BY COAST AND GEODETIC SURVEY 1951 LL0249'3.1 MI SW FROM PLATTEVILLE. LL0249'0.5 MILE SOUTH ALONG U.S.HIGHWAY 85 FROM THE POST OFFICE AT LLO249'PLATTEVILLE, THENCE 2.6 MILES WEST ALONG STATE HIGHWAY 66, AT A LL0249'ROAD JUNCTION, 65 FEET NORTH OF THE CENTER LINE OF THE H GHWAY, 26 LL0249'FEET WEST OF THE CENTER LINE OF A NORTH AND SOUTH ROAD, 39 FEET LL0249'NORTH OF A FENCE, 9 FEET NORTH OF A TELEPHONE POLE, 1 FOOT EAST OF LL0249'A FENCE, 3.5 FEET SOUTH OF A WITNESS POST, SET 1N THE TOP OF A LL0249'CONCRETE POST WHICH PROJECTS 0.5 FOOT ABOVE THE GROUND. LL0249 LL0249 STATION RECOVERY (1977) LL0249 LL0249'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 LL0249'MARK RECOVERED IN POOR CONDITION. LL0249 LL0249 STATION RECOVERY (1983) LL0249 LL0249'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 LL0249'RECOVERED IN GOOD CONDITION. LL0249 LL0249 STATION RECOVERY (2004) LL0249 LL0249'RECOVERY NOTE BY US POWER SQUADRON 2004 (GWS) LLO249'RECOVERED IN GOOD CONDITION. LL0249 LL0249 STATION RECOVERY (2005) LL0249 LL0249'RECOVERY NOTE BY US POWER SQUADRON 2005 (GWS) LL0249'FOUND AS DESCRIBED. ORANGE WITNESS POST IS GOOD. *** retrieval complete. Elapsed Time = 00:00:02 Page 3 A 44 URBAN DRAINAGE AND FLOOP CONTROL ISTRICT Paul A. Hindman, Executive Director 2480 W. 26th Avenue, Suite 156B Denver, CO 80211-5804 MEMORANDUM FROM: Ken MacKenzie, P.E. Master Planning Program Manager Telephone 303-455-6277 Fax 303-455-7880 www. udfcd. org SUBJECT: New Colorado Revised Statute §37-92-602 (8) "Concerning a Determination that Water Detention Facilities Designed to Mitigate the Adverse Effects of Storm Water Runoff Do Not Materially Injure Water Rights." DATE: March 9, 2016 (Original July 7, 2015) Senate Bill 15-212 was signed into law by Governor Hickenlooper in May 2015 and became effective on August 5, 2015 as Colorado Revised Statute (CRS) §37-92-602 (8). This statute provides legal protection for any regional or individual site stormwater detention and infiltration facility in Colorado, provided the facility meets the following criteria: 1. It is owned or operated by a governmental entity or is subject to oversight by a governmental entity (e.g., required under an MS4 permit) 2. It continuously releases or infiltrates at least 97% of all of the runoff from a rainfall event that is less than or equal to a 5 -year storm within 72 hours after the end of the event 3. It continuously releases or infiltrates as quickly as practicable, but in all cases releases or infiltrates at least 99% of the runoff within 120 hours after the end of events greater than a 5 -year storm 4. It operates passively and does not subject the stormwater runoff to any active treatment process (e.g., coagulation, flocculation, disinfection, etc.) 5. If it is in the Fountain Creek (tributary to the Arkansas River) watershed it must be required by or operated in compliance with an MS4 permit The statute specifies that runoff treated in stormwater detention and infiltration facilities shall not be used for any other purpose by the owner/operator/overseer (or that entity's assignees), shall not be released for subsequent diversion or storage by the owner/operator/overseer (or that entity's assignees), and shall not be the basis for a water right or credit. plan\ken\CRS 37-92-602(8) memo update 20151015 There are specific notification requirements that apply to all new stormwater detention and infiltration facilities, including individual site facilities built by private parties as a development requirement. For any stormwater detention and infiltration facility constructed after August 5, 2015 and seeking protection under the new statute, the "entity that owns, operates, or has oversight. for shall, prior to operation of the facility, provide notice to all parties on the substitute water supply plan notification email list maintained by the State Engineer. This notice must include the following: 1. The location 2. The approximate surface area at design volume 3. Data that demonstrate that the facility has been designed to comply with the release rates described in Items 2 and 3 above The Colorado Division of Water Resources (DWR) maintains seven email lists, one for each of the seven major watersheds in Colorado (these coincide with the seven DWR Divisions). UDFCD worked with DWR and the Colorado Stormwater Council to develop a simple data sheet and an online map -based compliance portal website that will allow all municipalities and counties in Colorado to easily upload this required notification information. The website application will then automatically send email notifications to the proper recipients, relieving public works staff of the emailing burden while also minimizing the volume of email going out to the email list recipients. Please note that the notification requirement applies only to new stormwater facilities (constructed after August 5, 2015), which the statute provides a "rebuttable presumption" of nor) - injury to water rights. This rebuttable presumption is contestable but only by comparison to the runoff that would have been generated from the undeveloped land condition prior to the development necessitating the stormwater facility. Stormwater facilities in existence before August 5, 2015 are defined in the statute as materially non -injurious to water rights and do not require notification. Additionally, the State issued a memorandum on February 11, 2016 indicating that construction BMPs and non -retention BMPs do not require notice pursuant to SB 2I2 and are allowed at the discretion of the Division Engineer, and that green roofs are allowable as long as they intercept only precipitation that falls within the perimeter of the vegetated area and do not intercept or consume concentrated flow nor store water below the root zone. The DWR Statement can be found here: http://water.state.co.us/D RIPub/Documents/DWR%20 torm%20Water%20Statement. The compliance portal can be found here: https://maperture.digitaldataservices.co /gvh ?viewer—cswd f A tutorial YouTube video can also be accessed from that website or found here: UDFCD YouTube Video planiken\CRS 37-92-602(8) memo update 20151015 df We also have a list of frequently asked questions with answers which is attached to this memorandum. Please email me at macke .zie@udfcd,org with any questions. plan ken4CRS 37-92-602(8) memo update 20151015 Frequently Asked Questions related to Colorado Revised Statute 37-92-602(8) Statute Related Questions Where can I find out more information on the statute? A memorandum can be found at: http://udfcd.org/gu idance-documents Does this statute apply only to facilities within MS4s or government owned facilities? Would a private facility located in a rural area need to be uploaded? The statute protects only those stormwater detention and infiltration facilities that are operated solely for stormwater management and are owned or operated by a governmental entity or are subject to oversight by a governmental entity (e.g., required under other statutes for flood protection or water quality). Additionally, to be covered, these facilities must meet the drain time limitations and other criteria specified in the statute and UDFCD memorandum. If a hypothetical private facility located in a rural area was voluntarily built (not as an imposed development requirement), it is not protected under the statute and no notification is required, but it may be considered a water diversion out of priority by the State. How do these new regulations apply to micropool designs since they typically will exceed the 120 hour release time period? The statute says "no other beneficial use" is allowed. Define "beneficial.'" As a municipal corporation, detention is beneficial to reduce pipe sizes. The volume of the micropool is typically 0.000E times the 5 -year inflow volume (0.06%) and 0.0002 times the 100 -year inflow volume (0.02%), which is well within the allowable criteria. Beneficial use refers to uses for which you would otherwise need a water right, like replacement water or irrigation water. Why is Fountain Creek excluded from legislation and what are the requirements to build a detention basin in the Fountain Creek watershed? Facilities in Fountain Creek that meet the other criteria specified in the statute are protected only if they are required by or operated in compliance with a Colorado -issued MS4 permit. Those facilities in the Fountain Creek watershed that do not meet this criterion are more susceptible to a claim of water right injury, but they do not otherwise require a water right. The exclusion of the Fountain Creek watershed was a necessary concession in order to get the backing of the Colorado Farm Bureau. Will existing facilities need to be retrofitted to meet the 72/120 hour drain time requirement? If your existing facility meets the drain time criteria specified in the statute, then the facility meets the compliance criteria. If your existing facility is a retention pond and you don't have a water right, then yes, you should retrofit (or get a water right). CSR 37-92-602(8) FAQ UDFCD 2015-08-26 How should retention facilities be handled? Neither retention facilities nor constructed wetlands are protected under 37-92-602(8) CRS. These facilities expressly require a water right. Does the bill require that o peration and maintenance demonstrate on -going compliance? What happens if a facility does n ot function as designed (e.g., lack of maintenance, poor infiltration)? The statute protects only those facilities that meet the drain time criteria. If a facility does not operate as designed, or if the design proves to be flawed, notonly is it not protected under 37-92-602(8) CRS, it also likely violates a CDPS-issued permit and corrective measures are responsibly warranted. What about regional facilities that are designed for a future condition but o perate in an interim mode that does not comply with the statute? Those constructed after August 5, 2015 should be designed to comply with the statute in their interim condition as well as in the final configuration. If they do not comply, they will not be protected under the statute, and no notification is required. Those already in operation on August 5, 2015 do not require notification, but are not protected unless they comply► with the drain time criteria. Are facilities designed to protect areas less than one acre subject to this legislation? Yes. There is no size threshold for the notification requirement. All stormwater detention and infiltration facilities that meet the definition in the statute and are made operable after August 5, 2015 are subject to the statute. Could a water rights holder contest a facility even without any real basis just to tie up a development or make it more difficult to . develop a property? What ability do irrigation companies, farmers, etc. have to impact a project when these notices go out? The water rights holder must show that the facility has caused injury (not will cause injury). The injury must be further with respect to the water the complainant would have received in the watershed condition that existed as of the water right's priority date, absent the urbanization necessitating the facility. In the case of redevelopment, is the calculation from the existing developed condition to the proposed developed condition or from the assumed 'rpredeveloped condition" Any challenge must be with respect to the water the plaintiff would have received in the watershed condition that existed as of the water right's priority date, absent the urbanization necessitating the facility. CSR 37-92-602(8) FAQ UDFCD 2015-08-26 What liability and/or responsibility does a contractor have while working on a stormwater detention facility that the responsible party (government entity, operator, design engineer, etc.) failed to comply with the notification requirements? If the facility is designed to drain in the time specified in the statute and proper notification is made, a claim of injury is not likely, since the claim must be in comparison to the water available before any of the land development that necessitated the detention in the first place. Statute does not apply to the following: • Flow through devices (e.g., media filter drains, hydrodynamic separators, baffle vaults without storage) • Process water holding ponds for the oil and gas industry It Stock ponds and irrigation ponds • Construction BMWs (e.g., sediment traps, etc.) • Any facility not meeting the following criteria: o is owned or operated by a governmental entity or is subject to oversight by a governmental entity; a continuously releases or infiltrates at least 97% of the 5 -year storm within 72 -hours; o continuously releases or infiltrates at least 99% of the 100 -year storm within 120 -hours; o operates passively and does not subject the stormwater runoff to any active treatment process. CSR 37-92-602(8) FAQ U DFCD 2015-08-z 6 Procedure and Compliance Workbook Related Questions In the design data spreadsheet do we use the 60 -minute 1 -year storm value (at basin location) for the WCICV design storm? Is the water quality capture volume drainage time a maximum or minimum of 40 hours? The Urban Storm Drainage Criteria Manual Vol. 3, Chap. 3 (http://www.udfcd.org/index.html) gives detailed information on sizing the water quality capture volume anywhere in Colorado and guidance on recommended drain times (e.g,, 40 hours for extended detention, 12 hours for rain gardens). Can we route our own inflow hydrographs through the spreadsheet to show compliance? Yes, there is a table to the right of the printable area that allows you to input your own storm hydrographs. In fact, this will be necessary for unusually large watersheds as the largest embedded inflow storm hydrograph in the workbook is 675.56 acre-feet in volume (the smallest is 0.001 acre-feet). The workbook has been tested successfully for watersheds as small as 0.1 acres in area. Define an "operational" detention facility A detention facility is operational when stormwater is flowing into it and flowing out of it (either on the surface or infiltrating into the soil below it), while experiencing a change in the detained volume over time (first increasing in volume and then decreasing). Does the design engineer u pload the notification or does the government entity with jurisdiction (MS4) u pload it? Would it be the City or the property owner? What is the recourse or plan of action against the detention facility owner if they do not comply with the notification compliance? Anyone can upload a site. Local jurisdictions have administrative privileges to create, modify, accept, or delete any record within their jurisdiction. This is to allow those jurisdictions to monitor for errant activity. Those with administrative privileges will also receive an email immediately whenever a record is created or modified within their jurisdiction. If the facility is designed to drain in the time specified in the statute and proper notification is made, a claim of injury is not likely, since the claim must be in comparison to the water available before any of the land development that necessitated the detention in the first place. After notification, if a downstream water right user objects, what then? The downstream user can't object to a facility before it is operable but they can rebut the presumption of non -injury if they can prove they have been (not will be) injured after the facility is in place (and only then in respect to water they would have received at their priority date). What type of feedback do you expect to get from the people receiving a n otification? Each record created will have two email addresses, one for the record creator and one for the community having jurisdiction over the site. You may anticipate inquiries as to the need for the facility and details about how it operates. CSR 37-92-602(8) FAQ UDFCD 2015-08-26 Would it be acceptable to notify at the time of plan approval and prior to construction? Yes, as long as notification occurs before the facility becomes operable, you are in compliance with the statute. We often use future detention basins as temporary sedimentation basins during construction. When do we provide notification? Construction sedimentation basins should not be uploaded the portal. If you are using the facility in a modified and temporary form during construction, wait until the final detention configuration is complete before entering the record. CSR 37-92-602(8) FAQ. UDFCD 2015-08-26 Portal & Notification Notes The compliance portal is located at: https J/ma perture.digita Idataservices.com/gyh,/?viewer=cswd if The compliance portal was developed to streamline the notification requirement of the new statute, Anyone can place a pin on the map to create a new stormwater detention/infiltration facility. The portal recognizes counties, cities, and towns as "jurisdictions" and has assigned to each jurisdiction administrative privileges. Jurisdictions can create, modify, or delete any record within their own jurisdiction, and must accept into the database a record created by anyone else within their jurisdiction. When a jurisdiction creates a new record it is automatically accepted into the database and its information is put into the queue for the email notification. The icon on the map interface will be blue. When anyone who is not a jurisdiction creates a new record in the portal database, the icon will remain green and no notification will go out until the jurisdiction accepts the record into the database which will turn the icon blue and place it in the queue for notification. The entity creating a record will be able to later edit that record using the edit password ernailed to them by the portal. The password is specific to the record. Note that the jurisdiction accepting the record does not indicate approval of the facility; it is simply a necessary database quality assurance measure to prevent vandalism and errant records. If the jurisdiction believes the record to be in this class, they may delete the record or contact the creator of the record to verify it. If a record is not accepted or deleted by the jurisdiction with 30 days of its creation, it will automatically be accepted by the system, turn blue, and notifications will go out within a week of that event, Records are perpetually viewable by those with administrative privileges but are removed from the map 30 days after being accepted into the database. Portal & Notification Related Questions If you have multiple facilities in series, is it appropriate to upload each separately? For example, four water quality rain gardens in a parking lot drain to a downstream flood control facility. How many facilities should be uploaded to the site? If the facilities are intended for water quality only, they do not require notification (with the exception of extended detention basins). An extended detention basin designed to treat only the water quality capture volume followed by a flood control facility can be entered as two separate facilities or one facility accommodating for the effective stage/storage and drain times of the two facilities. In the stated example, only the downstream flood control facility need be uploaded. If there are multiple flood control facilities in series, appropriate drain times should be demonstrated. UDFCD recommends documentation outside of the compliance portal workbook for this purpose, (e.g., attach SWMM output). CSR 37-92-602(8) FAQ UDFCD 2015-08-26 Does notification need to take place for modifications to existing detention facilities already in the portal? If the facility is already operable on August 5, 2015, it is defined in the statute as non -injurious to water rights, provided it meets the other drain time criteria specified in the statute. If your modifications are going to make the downstream water rights holders condition better (e.g., smaller stored volume or faster drain time), then no notification is required. If the opposite is true, handle it as a new facility and provide notification of the new configuration. Are State agencies and RID to be given usernames and passwords? Those agencies will be treated in the same manner as jurisdictions, and will have editorial privileges necessary to create, modify, and delete only their own records. The cities, towns, and counties of Colorado will have administrative privileges to create, modify or delete any record within their jurisdiction. Who will be auditing the statewide notification compliance portal for correct data? There is no statutory enforcement mechanism. Those communities having administrative privileges will receive an email notice every time a record is created, edited, or deleted within their jurisdiction and should review these records for accuracy. The DWR does react to complaints.. If the community uploads the data for the developers, does it appear that the community is the owner? Each record will have two contact email addresses as part of the public record, one for the engineer of record and one for the community having jurisdiction over the facility. Why do I have to print a pdf to upload, and not just upload my spreadsheet? Can't this feature be built into the portal? For reasons of consistency and storage limitations, the design data sheet can only be in pdf format. This also minimizes the risk of document altering by others. Where is the compliance portal? https:,/maperture.digitaldataservices.com/gvh/?viewer=cswdif What resources are available to help navigate the compliance portal? A webinar recording is available at: UDFCD YouTube Video Do existing facilities need to be entered? No, if the facility was operable on August 5, 2015, notification is not required, These facilities are defined in the statute as non -injurious to water rights, provided they meet the other criteria specified in the statute. How will interested parties be notified of newly uploaded facilities? A weekly digest email will be sent out to the recipients in each of the DWR's seven divisions. Each division will receive an email on a different day of the week to minimize traffic loading on the compliance portal. Only those posted since the previous email will be included. Additionally, those facilities in existence for more than 90 days will no longer be visible to the general audience, only to those with editorial or administrative privileges. This is to reduce clutter on the portal and ease navigation for the end user. CSR 37-92-602(8) FAQ UDFCD 2015M8-25 Is there a backup of the site's data somewhere? If a detention facility is below grade, is that apparent to users of the portal? Is water surface area needed? The site has robust security features and automatic backups are produced and stored offsite at regular frequent time intervals. The statute applies to facilities above and below grade, and there is no requirement to distinguish which type the facility is. The water surface at design volume is one of three pieces of information mandated under the statute's notification requirement. Do not enter zero for this value; instead enter the area of the vault, Do we need to input an address, a latitude and longitude, what are the criteria to place a facility in the portal correctly? The map feature offers a number of ways to zoom to the correct location, including "zoom to address" and "zoom to map." Any of these methods should enable you to place a marker within 100 feet of the exact location. This meets the intent of the notification requirement. Once you place the pin, the latitude, longitude, DWR division, and local jurisdiction will all be automatically populated in the database. How do you prevent duplicate entries? What if two separate entities report compliance for the same facility. The map interface feature should eliminate this problem. When placing a marker icon, if there is already a marker icon at your location, click on that icon to retrieve the specific data for comparison. The local government will receive an email notice immediately when a new record is created within their jurisdiction. What types of facilities require notification per SR -212? Water Quality Only Flood Control Included vi 0. Grass Buffers Not Required Not Required Grass Swales Not Required Not Required without Bioretention (with an underdrain) or Not Required q Required Green Roof Not Required N/A Required Required Extended Detention Basin Sand Filter Not Required Required Permeable Systems Pavement Not Required q Required 2 CO Not Required Not Required Media Filter Drain Underground Vaults I Detention Required Required Constructed Pond Wetland N/A, SUBJECT TO WATER RIGHTS Constructed Channel Wetland N/A, SUBJECT TO WATER RIGHTS RI G Retention Pond N/A, SUBJECT TO WATER RIGHTS CSR 37-92-602(8) FAQ UDFCD 2015-08-26 G. "37, '° . A. # ; ki s • , . •', s- . ' i*.lk . . COLOR A D Department of Public I Health Et Environment Dedicated to protecting and improving the health and environment of the people of Colorado STORMWATER FACT SHEET - CONSTRUCTION Contents A. Introduction 1 B. Obtaining Regulatory Coverage 2 1. Do you need a Permit? 2 a. Applying for a Permit 3 b. Options: Small Construction Sites..,.3 i. Qualifying Local Programs +.......13 R -Factor Waiver 3 2. Who May Apply? 4 C. Permit Requirements ..... D. Local Stormwater Requirements .. I .. , ..5 E. Amending Your Permit Certification S F. Ending Your Permit Coverage 6 G. Multiple Owner/Developer Sites 7 7 1. Permit Coverage . • • s • . a 2. Permit Compliance 8 H. Sale of Residence to Homeowners 10 I. Construction Dewatering .. 10 J , Concrete Washout 10 A. INTRODUCTION Look for this symbol throughout this guide for brief summaries of the most important information you need to know about stormwater permitting for construction activities. Then read further if you want more details. In 1992, the State of Colorado stormwater regulation went into effect to control municipal and industrial stormwater discharges, based on EPA regulations. The regulation is meant to reduce the amount of pollutants entering streams, rivers, lakes, and wetlands as a result of runoff from residential, commercial and industrial areas, The State regulation (5 CCR 1002-61) covers discharges from specific types of industries including construction sites, and storm sewer systems for certain municipalities. In Colorado, the program is under the Colorado Department of Public Health Et Environment, Water Quality Control Division (the Division). The Colorado program is referred to as the Colorado Discharge Permit System (CDPS), and regulated stormwater discharges from construction activities are covered under the CDPS General Permit for Stormwater Discharges Associated with Construction Activities (the Stormwater Construction Permit). Construction activities produce many different kinds of pollutants which may cause stormwater contamination problems. The main pollutant of concern at construction sites is sediment. Grading activities remove grass, rocks, pavement and other protective ground covers, resulting in the exposure of underlying soil to the elements. The soil is then easily picked up by wind and/or washed away by rain or snowmelt. Sediment runoff rates from construction sites are typically 10 to 20 times greater than those from agricultural lands, and 1,000 to 2,000 times greater than those from forest lands. During a short period of time, construction activity can contribute more sediment to streams than would normally be deposited over several decades, causing physical, chemical, and biological harm to our State's waters. The added sediment chokes the river channel and covers the areas where fish spawn and plants grow. Excess sediment can cause a number of other problems for water bodies, such as increased difficulty in filtering drinking water, and clouding the waters, which can kill plants growing in the river and suffocate fish. A number of pollutants, such as nutrients, are absorbed onto sediment particles and also are a source of pollution associated with sediment discharged from construction sites. Page 1 of 10 Revised 7-2015 4300 Cherry Creek Drive S., Denver, CO 80246-1530 P 303-692-2000 www.c.olorado.gov/cdphe John W. Hickerlooper, Governoa. ! Lai ry Wolk, MD, MSPH, Executive Director and Chief Medical Officer In addition, construction activities often require the use of toxic or hazardous materials such as fuel, fertilizers, pesticides and herbicides, and building materials such as asphalt, sealants and concrete, which may also pollute stormwater. These materials can be harmful to humans, plants and aquatic life. This Fact Sheet provides general guidance for compliance with the CDPS permitting requirements for stormwater discharges from construction activities. The Division reserves the right to interpret the permitting requirements on a case -by -case basis, as necessary. B. OBTAINING REGULATORY COVERAGE FOR CONSTRUCTION SITES You must obtain permit coverage (or an ReFactor waiver) to discharge stormwater from any construction activity that disturbs at least 1 acre of land (or is part of a larger common plan of development or sale that will disturb at least 1 acre). if\ The owner or operator must apply for coverage under the Stormwater Construction Permit at least 10 days prior to the start of construction activities. The application is available from the Division's web page. 1) Do you need to obtain coverage under the Stormwater Construction Permit? Construction Sites that disturb one acre or greater, or are part of a larger common plan of development disturbing one acre or greater, are covered under Colorado's stormwater permitting requirements. Generally, permit coverage is required, as discussed in Part B.1.a, below. However, additional options may exist if your project or plan of development will disturb less than 5 acres (Small Construction Site), as discussed in Part B.1.b, below. If permit coverage is required, or a waiver applied for, it must be maintained until the site is finally stabilized. is it part of a larger common plan of development or sale' "A common plan of development or sate" is a site where multiple separate and distinct construction activities may be taking place at different times on different schedules. Examples include: 1) phased projects and projects with multiple filings or lots, even if the separate phases or filings/lots will be constructed under separate contracts or by separate owners (e.g., a project where developed lots are sold to separate builders); 2) a development plan that may be phased over multiple years, but is still under a consistent plan for long-term development; and 3) projects in a contiguous area that may be unrelated but still under the same contract, such as construction of a building extension and a new parking lot at the same facility. If the project is part of a common plan of development or sale, the disturbed area of the entire plan must be used in determining permit requirements. Disturbance associated with utilities, pipelines, or roads that are constructed for the purpose of serving a facility, are considered together with that facility to be part of a common plan of development. However, adjacent construction of trunk lines or roads that are partof a regional network and not directly associated with the facility construction, are not usually considered to be part of the common plan for that facility. Note that permit coverage or an R -Factor waiver is stilt required for each individual project (facility or adjacent construction activity) that disturbs one or more acres. What is the total estimated area of disturbance? The area of disturbance is the total area at the site where any construction activity is expected to result in disturbance of the ground surface. This includes any activity that could increase the rate of erosion, including, but not limited to, clearing, grading, excavation, and demolition activities, installation of new or improved haul roads and access roads, staging areas, heavy vehicle traffic areas, stockpiling of fill materials, and borrow areas. Construction does not include routine maintenance to maintain original fine and grade, hydraulic capacity, or original purpose of the facility. ,`Finally Stabilized" means that all ground surface disturbing activities at the site have been completed, and all disturbed areas have been either built on, paved, or a uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre -disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. Re -seeding atone does not qualify. Page 2 of 10 Revised 7-2015 4300 Cherry Creek Drive S., Denver, CO 80246.1530 P 303-692-2000 www.cotoracio.gov/cdphe John W. Hickenk'oper, Governor ; Lally Wolk, MD, M5PH, Executive Direr_te' and Chief Medical Officer What are the requirements for recommencing construction activities at a later date at a site that has been completely stabilized and the permit terminated? if a common plan of development is completely stabilized such that the entire common plan of development meets the definition of finally stabilized and permit coverage for that common plan of development has been terminated (the permittee has submitted a notice of termination to the division and the division has confirmed that the certification has been inactivated), then a new determination of "common plan of development" shalt be made for any future construction activities conducted by a different owner(s)/developer(s) that occur within the previously permitted area to determine if permit coverage is needed. However, if the original owner/developer of a common plan of development, that achieved final stabilization and terminated permit coverage, is the one who is restarting construction activities within that development, then any construction activity they are engaged in would be considered part of the original larger common plan of development and therefore require permit coverage if one acre or greater. Note that if the site has never been finally stabilized, then this does not apply as the original development is considered ongoing. a) Applying for a permit Application for coverage under the Stormwater Construction Permit must be made at least 10 days prior to the start of construction activities, unless the site is a SmallConstruction Site that qualifies for an alternative option discussed in BA .b, below. An application, which includes guidance on developing a Stormwater Management Plan (SWMP), is available from the Division. The SWMP must be completed prior to application. See Section C, "Permit Requirements," for further information. If your application is complete, it win be processed and your permit certification mailed to you. The Stormwater Construction Permit certification must be inactivated once the site has been finally stabilized, in order to end permit coverage and billing. An inactivation form is supplied with the permit certification. b) Additional Options for Small Construction Sites (at least 1 acre, but less than 5 acres of disturbance) The following options may apply to Small Construction Sites that disturb less than 5 acres, and are not part of a larger common plan of development exceeding 5 acres. (Regardless of which option applies at the State level, all local requirements must still be met as discussed in Section D, below.) The options discussed under Parts b.i and b.ii below are not available for Large Construction Sites. i) obtain coverage under a State -designated Qualifying Local Program (For Small Construction Sites Only) The Division may designate a local municipality's stormwater quality control program as a Qualifying Local Program. This means that the local program's requirements are at least as stringent as the State permit. In this case, it is not required for the owner or operator to apply for permit coverage under the Stormwater Construction Permit. The local municipality will be responsible for notifying you that you do not need to apply for State coverage, if this is an option. You can also view a list of the few municipalities with Qualifying Local Prograngs at the Division's web page (see first page for web address). The local program must have been formally designated by the Division to qualify. Most municipalities have some type of local program and may require permits and fees. However, simply having a local program in place does not necessarily mean that it is a qualifying program and that the Division's Stormwater Construction Permit application is not required. The current designated Qualifying Local Programs inColorado are the Cities of Durango, Golden, and Lakewood, ii) Apply for coverage under the R -Factor Waiver (Available for Small Construction Sites only) The R -Factor waiver allows a site owner or operator to apply for a waiver from coverage under the Division's Stormwater Construction Permit, if the R -Factor, calculated using the state -approved method, is less than 5 during the period of construction. The R -Factor is a way to measure erosion potential based on the length of the project and time of year. An application with instructions for using the State•approved method is available from the Division's web page (see first page for web address). In general, the only projects that will qualify for the waiver are projects that are completely stabilized within a month or two after the start of construction. That means that projects relying on seeding for revegetation will usually not qualify for the waiver, because the vegetation must be established before the Page 3 of 10 Revised 7-2015 4300 Cherry Creek Drh S., Denver, Co 80246.1530 P 303-692-2000 ww,-,v.cotorado.gov/cdphe John Y. HickenEcioper. . Governor Larry Wolk., MD, MSPH, Executive Director and Chief Medical. Officer site is considered stabilized. During the spring and summer months, when Colorado experiences the bulk of its rainfall, many projects will not qualify at all for the waiver. In addition, the Division wilt not grant waivers for construction sites located in areas where snow cover exists at, or up gradient of, the site for extended periods of time, if the construction site will potentially remain active and unstabilized during spring runoff. This waiver does not relieve the operator or owner from complying with the requirements of local agencies, such as meeting local stormwater quality► requirements, including those required by a Qualifying Local Program as discussed in Section B.1.b.i, above. Who may apply for permit coverage? The Permit applicant must be a legal entity that meets the definition of the owner and/or operator of the construction site, in order for this application to legally cover the activities occurring at the site. The applicant must have day-to-day supervision and control over activities at the site and implementation of the SWMP, Although it is acceptable for the applicant to meet this requirement through the actions of a contractor, as discussed in the examples below, the applicant remains liable for violations resulting from the actions of their contractor and/or subcontractors. Examples of acceptable applicants include: • Owner or Developer - An owner or developer who is operating as the site manager or otherwise has supervision and control over the site, either directly or through a contract with an entity such as those listed below. • General Contractor or Subcontractor - A contractor withcontractual responsibility and operational control (including SWMP implementation) to address the impacts construction activities may have on stormwater quality. • Other Designated Agents/Contractors - Other agents, such as a consultant acting as construction manager under contract with the owner or developer, with contractual responsibility and operational control (including SWMP implementation) to address the impacts construction activities may have on stormwater quality. An entity conducting construction activities at a site may be held liable for operating without the necessary permit coverage if the site does not have a permit certification in place that is issued to an owner and/or operator. For example, if a site (or portion of a site) is sold or the contractor conducting construction activities changes, the site's permit certification may end up being held by a permittee (e.g., the previous owner or contractor) who is no longer the current owner and/or operator. In this case, the existing permit certification wilt no longer cover the new operator's activities, and a new certification must be issued, or the current certification transferred. See Section F, below, for additional guidance on scenarios v ith multiple owners and/or operators. Utilities, Other Subcontractors, etc.: A separate permit certification is not needed for subcontractors, such as utility service line installers, where the permittee or their contractor is identified as having the operational control to address any impacts the subcontractor's activities may have on stormwater quality►. Although separate permit coverage may not be needed in some cases, these entities are not exempt from the stormwater regulations for all of their projects and may stilt be held liable if their activities result in the discharge of pollutants. Leases: When dealing with leased land or facilities, the lessee shall be considered the "owner" for the purposes of stormwater permitting if they are responsible for the activities occurring at the site. C. PERMIT REQUIREMENTS The primary requirement of the Stormwater Construction Permit is the development and implementation of a Stormwater Management Plan (SWMP). The permit application includes guidance that must be followed fordevelopment and implementation of the SWMP. Permit requirements are the same for both Small and Large Construction Sites. The Stormwater Construction Permit requires dischargers to control and eliminate the sources of pollutants in stormwater through the development and implementation of a Stormwater Management Plan (SWMP). The purpose of a SWMP is to identify possible pollutant sources that may contribute pollutants to stormwater, and identify Best Management Practices (BMPs) that, when implemented, wilt reduce or eliminate any possible water quality impacts. For construction activities, the most common pollutant source is sediment. Other pollutant sources include fuels, fueling practices and chemicals/materials stored on site, concrete washout, etc. BMPs encompass a wide range of practices, both structural and non-structural in nature, and may include silt fence, sediment ponds, vehicle tracking Page 4 of 10 Revised 7-2015 4300 Cherry Creel•: Drive S., Denver, Co 80246.1530 P 303-692-2000 www.rotorado.govfcdphe John W. Hickerilooper. . Governor Larry Wolk, MD, MSPH, Executive Diiectoi and Chief Medical Officer controls, good housekeeping, inspection and maintenance schedules, training, etc. The SWMP is not submitted with the permit application unless requested. An up-to-date copy of the SWMP must be kept on site, for use by the operator, and so that Division, EPA, or local inspectors can review it during an inspection, If an office location is not available at the site, the SWMP must be managed so that it is available at the site when construction activities are occurring (e.g., by keeping the SWMP in a superintendent's vehicle.) Further information concerning the contents of the SWMP can be found in Appendix A of the application, "Preparing a Stormwater Management Plan." This document and others can be obtained from the Division's web site or by contacting the Division (see first page for address information). D. LOCAL STORMWATER REQUIREMENTS FOR CONSTRUCTION Where local requirements exist for stormwater management, an owner/operator must comply with both f\ the Division's and the local agency's requirements. in addition to the requirement to obtain and comply with the Division's Stormwater Construction Permit, it is possible that additional government agencies (Le., cities, counties, and special districts) may impose local requirements to control the discharge of pollutants from construction activities. An owner or operator of a construction activity must comply with the Stormwater Construction Permit requirements discussed in this Fact Sheet, even if they are also covered by a local program's requirements. (However, in the case of a Qualifying Local Program, as discussed in Section BA . b, ii, some administrative requirements for the Stormwater Construction Permit may be simplified.) Likewise, the Stormwater Construction Permit does not preempt or supersede the authority of local agencies to prohibit, restrict, or control discharges of stormwater. Where a local program places additional restrictions on stormwater management at a construction site within its jurisdiction, the owner/operator must comply with those stricter requirements in addition to the Division's permitting requirements. For example, although the Division allows several options for permitting at multiple owner/operator sites, a local authority may restrict these options and require specific procedures to be followed for who maintains permit coverage and authority for stormwater discharges. M54 Permits Many cities, counties, and special districts are covered by a Municipal Separate Storm Sewer System (MS4) permit. These permits require the governmental entity to implement various programs to improve stormwater quality in their jurisdiction. Included in these permits is the requirement to implement a program to manage the discharge of pollutants from construction sites within their jurisdiction. Therefore, if a construction site located within the jurisdiction of one of these government entities does not properly manage stormwater at that site, the government entity may be in violation of their permit in addition to the construction site owner and operator. E. AMENDING YOUR PERMIT CERTIFICATION This section is only applicable if the limited information on the construction project submitted in the two- page application form changes. in such case, it may be necessary to provide the Division with revised information. If the information provided by the permittee in their twos -page application form is no longer accurate, the permittee must provide the revised information to the Division. This includes such items as the planned total disturbed acreage, and the project legal description or map originally submitted with the application. (Note: it is not necessary to revise the anticipated final stabilization date, since the information provided was only an estimate) . To revise this information, provide a letter to the Division's Stormwater Program (see the contact information on page 1) that includes the revised information. The Division will not respond to this letter, so you are advised to obtain delivery confirmation from your postal service to confirm receipt. When the Stormwater Management Plan is revised, as required by the Stormwater Construction Permit, it is not necessary to notify the Water Quality Control Division. When BMPs or other site details discussed in the SWMP are modified, the SWMP must be updated to accurately reflect the actual field conditions. Examples include, but are not Page 5 of 10 Revised 7-2015 4300 Cherry Creek Drive S,, Denver, CO 80246-1530 P 303-692-2000 vAvw.colorado.govicdphe John W, Hickert!Doper, Governor ; Lately Wolk, MD, MSPH, Executive Dicec:toi and Chief Medical Officer limited to, removal of BMPs, addition of BMPs, modification of BMP design specifications, and changes in items included in the site map and/or description. However, this information is not submitted to the Division, unless requested. F1 ENDING YOUR PERMIT COVERAGE A Stormwater Construction Permitcertification remains active until inactivated, or transferred or reassigned to a new responsible party. Forms for inactivation, transfer or reassignment of a permit certification can be obtained from the Division's web site or by contacting the Division (see first page for address information). 1) Inactivation notice Permit coverage for a site that has been finally stabilized in accordance with the SWMP (see definition in Section 8.1, above), may be inactivated by submitting a completed Inactivation Notice form. This form contains a certification statement that must be signed in accordance with the General Requirements of the permit. Also, the permittee may inactivate permit coverage at sites where all areas have been removed from their permit coverage, by one or more of the methods below: • reassignment of permit coverage (see Section F.3); • sale tb homeowner(s) (see Section H); and/or amendment by the permittee, as discussed in Section E, above for areas where permit coverage has been obtained by a new operator (see Part GA, below) or the area is returned to agricultural use (see the Division's •Y Oil and Gas Construction Fact Sheet). In these cases the permittee would no longer have any land covered under their permit certification, and therefore there would be no areas remaining to finally stabilize. Submittal of an Inactivation Notice is still required and must discuss how the above conditions have been met. 2) Transfer of permit Permit coverage for a construction site may be transferred to a new entity when responsibility for stormwater discharges at the site changes from the permittee to the new entity. To transfer permit coverage, the permittee must submit a completed Notice of Transfer and Acceptance of Terms form that is signed in accordance with the General Requirements of the permit. if the new entity will not complete their portion of the transfer form, the permit certification may be inactivated if the permittee has no legal responsibility for the construction activities at the site, requests inactivation in written correspondence to the Division, and submits a completed Inactivation Notice form. 3) Reassignment ofpermit Permit coverage for a specific portion of a permitted site may be reassigned to a new entity when a permittee no longer has control of that portion of the site, and wishes to transfer coverage of that portion to a second party. To reassign permit coverage for a specific portion of a permitted site, the permittee must submit a completed Notice of Reassignment of Permit Coverage form that is signed in accordance with the General Requirements of the permit. If the new entity will not complete their portion of the reassignment form, the specific portion of the site may be removed from permit coverage if the permittee has no legal responsibility for the construction activities at the portion of the site, and a written request (including contact information for the new entity) is submitted to the Division. G. PERMITTING FOR DEVELOPMENTS WITH MULTIPLE OWNERS AND/OR OPERATORS For situations where multiple entities meet the definition of owners and/or operators for different portions of a development (e.g., a single development with multiple lots being owned and operated by separate entities), extra care must be taken to ensure that proper permit coverage is maintained and that stormwater management practices are correctly documented and implemented. Local stormwater quality programs may have differing requirements for who must maintain permit coverage, and what actions must occur when permitted areas and/or activities change. Construction site owners and operators must ensure Page 6 of 10 Revised 7-2015 4300 Cherry Creek Drive S., Denver. CO 80246-1530 p 303-692-2000 www.cotorado.gcvlcdphe John W. Hir, ken(ooper, Governot Larry Wolk, MD, MSPH. Executive Director and Chief Medical Officer that their actions do not result in violations of local program requirements. Refer to Section D for additional information4 1) Permit Coverage for Multiple Owner/O perator Development When a portion of a permitted site is sold to a new owner, a permit certification must be in place that is held by an entity meeting the definition of owner and/or operator of the sold area (see the discussion in Section B.2, above). This may be accomplished in one of the following ways: a) Coverage Under the Existing Certification Activities at the sold area may continue to be covered under an existing permit certification for the project if the current permittee meets the definition of operator for the sold area. To meet the definition of operator, the current permittee must have contractual responsibility and operational control to address the impacts that construction activities at the sold area may have on stormwater runoff (including implementation of the SWMP for the sold area). Therefore, a legally binding agreement must exist assigning this responsibility to the current permit holder on behalf of the new owner and/or operator for the sold area. It is not necessary to notify the Division in such case. However, documentation of the agreement must be available upon request, and the SWMP must be maintained to include all activities covered by the Stormwater Construction Permit. I - Example: Developer Dan sells a lot to Builder Bob. Developer Dan is currently covered by a permit certification that covers a larger area, which includes the sold lot. Developer Dan and Builder Bob may enter into a contract that assigns the responsibility for permit coverage and stormwater management to Developer Dan for Builder Bob's lot. Developer Dan is also responsible for making sure his SWMP includes the activities on the sold tot. Developer Dan's permit certification will continue to cover construction activities on Builder Bob's tot. New Certification Issued - Reassignment - A new permit certification may be issued to the new owner and/or operator of the sold area. The existing permittee and the new owner and/or operator must complete the Reassignment Form (available from the Division's web page, see page 1) to remove the sold area from the existing permit certification and cover it under a certification issued to the owner and/or operator of the sold area. Both entities must have SWMPs in place that accurately reflect their current covered areas and activities. Example: Developer Dan sells a lot to Builder Bob. Developer Dan is currently covered by a permit certification that covers a larger area, which includes the sold tot. For this example, Developer Dan and Builder Bob must jointly submit the Reassignment Form. Builder Bob will be issued a new permit certification for his lot and the lot will be removed from Developer Dan's permit coverage. Prior to submittal of the Reassignment Form, Developer Dan must revise his SWMP to reflect the changes in his covered area and activities, and Builder Bob must develop his own SWMP to cover the area and activities he will obtain coverage for. c) Amend Existing Permit Certifications - in some cases, both parties (the original owner/operator and the new owner/operator of an area undergoing transfer of ownership or operation) will already both be permit holders for their portions of the overall project (i.e., at least two permit certifications are issued for the project and cover both the party wishing to reassign coverage and the party wishing to accept coverage). When an additional area is transferred between the two parties, the permittees may simply amend their permit certifications instead of completing the Reassignment Form. Both parties must separately complete the procedures discussed in Section E to amend their permit coverage, removing the applicable area(s) from the original owner/operator's permit coverage, and adding the area(s) to the new owner/operator's permit coverage. The requests must cite both permit certification numbers. (Note: this request may be submitted jointly if it is signed by both entities). This option will likely be used in cases where a developer and an owner have already submitted a Reassignment Form, as discussed in Part b, above, where an initial transfer of tots has occurred, and then additional lots are transferred at a later date. Both entities must have SWMPs in place that accurately reflect their current covered areas and activities. Example: Developer Dan sells a lot to Builder Bob. Developer Dan is currently covered by a permit certification that covers a larger area, which includes the sold lot. In addition, Builder Bob also holds a permit certification for other portions of the development which he already owns, and Builder Bob wishes to cover his new tot under this certification. Developer Dan submits a request to remove the lot from his permit certification and provides Builder Bob's permit certification number that the lot will now be covered under. Builder Bob also submits a request to modify his permit certification to add the lot, and provides Developer Dan's permit Page 7 of 10 Revised 7-2015 4300 Cherry Creek Drive S., Denver, CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe John W. Hickenlooper, Governor Larry Wolk. MD, MSPH. Executive Director and Chief Medical Officer certification number under which the lot was previously covered, Developer Dan and Builder Bob must revise their SWMPs to reflect the changes in their covered area and activities. 2) Permit corn'Hance for Multi le Owner/O Aerator Develo • ment As a permittee, the most important concept for projects where multiple entities are involved is: if activities within your permitted area result in pollution of stormwater, al are the entity responsible for ensuring that those pollutants are properly managed. Permittees are responsible for complying with the Stormwater Construction Permit requirements for the areas and activities for which they have permit coverage, and for all BMPs they are relying on to comply with the permit. Properly addressing and documenting the responsibility of various parties at a construction site will help protect an entity from liability in the case where another party's actions result in failure of BMPs. Pollutants from outside the Permitted Area: A permittee may be held liable for pollutants that pass into and are then discharged from their permitted area Or that result from another entity's activities. Specifically, a permittee may have responsibility to ensure proper implementation of BMPs to control stormwater discharges from their permitted area, even if another entity is contributing pollutants. The Stormwater Construction Permit requires the permittee to ensure the implementation of BMPs which will be used to control the pollutants in stormwater discharges associated with construction activity from their permitted area. Therefore, a permittee may be responsible for adequately implementing and maintaining BMPs that are providing treatment for pollutants originating outside of their permitted area or from another entity's activities. An example is when a permittee's property is being used by a separate entity for construction activities (e.g., loading and unloading, site access, materials storage, etc.), or BMPs located on the permittee's property are being relied on to treat stormwater runoff from another site. This scenario is common when a developer sells off lots to a builder. As a practical matter, what most often occurs is that the developer must allow the builder to use the developer's infrastructure (e.g., roads, storm drains, ponds, etc.) for activities and BMPs that cannot realistically be limited to the builder's property. In this case, the developer remains a liable party (in addition to the builder) to ensure that proper stormwater management is implemented for the project. Permit coverage may instead be assigned to the builder for this infrastructure, if the builder has been designated as the operator of the area for stormwater quality purposes (See Section B.2). However, this may not always be practical when multiple builders are operating in an area or when the developer is still performing their own construction activities. Refer to the Liability and Example sections, below, for further guidance. b) BMPs Located Outside the Permitted Area: If a permittee will be relying on BMPs that are outside of the area they own and/or operate, the specific actions listed below must be taken to ensure compliance with the Stormwater Construction Permit. The permittee is responsible for ensuring the proper managment all pollutants from their permitted area. Even if the BMP are implemented by another party, the permittee may still be liable if their pollutants are eventually discharged. The permittee is responsible for ensuring the operation and maintenance of alt BMPs that are used to control pollutants that originate from their activities, even if the BMPs are located outside of the area owned and/or operated by the permittee. For example, a builder may only have ownership of a single tot, but may have to rely on BMPs that are located off of their lot and on a developer's property to adequately manage stormwater runoff, such as inlet protection that is on the developer's streets. If a permittee will rely on BMPs that are outside the area that they own and/or operate, the following measures must be taken: i) Any off -site BMPs must be documented in the permittee's SWMP. This includes structural BMPs (e.g., inlet protection and sediment ponds) and non-structural BMPs (e.g., concrete wash out areas and street sweeping). By including the BMPs in the SWMP, the permittee can effectively include the practices under Page 8 of 10 Revised 7-2015 4300 Cherr, Creek Drive S., Denver, CO 80246.1530 P 3O3-692.2000 www. cotorado.gov/cdphe John W. Hickenlooper} Governor Larry Wolk, MD, MSPH, Executive Director and Chief Medicat Officer their permit coverage. In such cases, the same off -site BMPs may actually be included in two or more parties' SWMPs. ii) The permittee must have adequate permission from the land and/or BMP owner(s) to utilize the off -site conveyances and BMPs and to ensure proper maintenance and operation. The permittee must be able to provide evidence of this agreement upon request. iii) The off -site BMPs must be operated and maintained in accordance with the SWMP(s) and must control the discharge of pollutants. It may be necessary to enter into agreements with other parties to ensure operation and maintenance of these BMPs. Regardless of who actually carries out the operation and maintenance of a BMP, all permittees who make use of the BMP to control pollutants from their construction activities remain liable if the BMP is not adequately operated and maintained. iv) AU BMPs must be located prior to discharge to surface waters or municipally -owned storm sewer systems. Liability: In the above examples, to reduce liability, the developer and builder should communicate on stormwater management issues and document who will be responsible for specific BMPs (e.g., who wilt maintain inlet protection and implement street sweeping). If BMPs are not being adequately implemented by the party defined as responsible, the other party should take the necessary action to ensure pollutants originating from, or passing through, their permitted area are properly controlled. It is recommended that stormwater management responsibilities be addressed in contracts or other legal agreements between applicable owners and operators for construction sites where one party's actions may impact another party's permit compliance. These legal agreements will both help define roles and responsibilities at a multi owner/operator site, and also may be used to seek damages from a contractor if monetary penalties are issued to a permittee for permit violations. Example: Developer Dan sells a lot to Builder Bob. Following the procedures discussed in Section GA .b or c, above, Builder Bob obtains separate permit coverage for his new lot, ending at the curb line. Because the site infrastructure is being utilized by several different builders at the project, Developer Dan maintains permit coverage for the streets, storm drain system, and a large retention pond that is designed and implemented as a BMP to manage pollutants from construction activities at the development (including Builder Bob's lot). In addition to the large pond, inlet protection is also being used to protect storm sewer inlets located on Developer Dan's roads, and street sweeping is occurring to control sediment tracked onto Developer Dan's roads. Builder Bob is relying on the pond, inlet protection, and street sweeping to manage pollutants from his lot, and therefore has included the BMPs in his SWMP, as discussed in Section G .2.b, above. The BMPs are also included in Developer Dan's SWMP because they are being used to control pollutants from property he still maintains control over, as discussed in Section G.2.a, above. In addition, Developer Dan and Builder Bob enter into a contract that clearly defines Developer Dan as being responsible for implementing and maintaining the infrastructure BMPs (i.e., the pond, inlet protection, and street sweeping BMPs), and requires Builder Bob to implement additional BMPs on his lots, such as vehicle tracking control and construction waste management. If the infrastructure BMPs are not properly operated and maintained, or discharges of sediment and/or other pollutants from Builder Bob's lot are not properly controlled and overwhelm the infrastructure BMPs, both Developer Dan and Builder Bob may be in violation of their permits. Therefore, Builder Bob and Developer Dan must both remain diligent in ensuring that conditions of their contract are being met and BMPs operated by both parties continue to be implemented in accordance with their SWMPs. SALE OF RESIDENCE TO HOMEOWNERS Residential lots that have been conveyed to a homeowner and that meet the specific criteria below do not require coverage under the Stormwater Construction Permit. • In this case, the conveyed lot may be removed from coverage under the permittee's certification, and the permittee is no longer responsible for meeting the terms and conditions of this permit for the conveyed tot, including the requirement to transfer or reassign permit coverage. The permittee remains responsible for eventual inactivation of the original certification (see Part F, above). The criteria for these lots are as follows: 1) The lot has been sold to the homeowner(s) for private residential use; 2) the lot is less than one acre of disturbed area; 3) all construction activity conducted by the permittee on the lot is completed; Page 9 of 10 Revised 7-2015 4300 Cherry Creek Drive S., Denver, Co 80246-1530 P 303-692-2000 www.colorado.wwvicdphe John W. Hickernlooper, , Goverriol ! Larry Wok, MD, MSPH, Executive Director and Chief Medical Officer 4) a certificate of occupancy (or equivalent) has been awarded to the homeowner; and 5) the SWMP has been amended to indicate the lot is no longer covered by permit. Lots not meeting all of the above criteria re uire continued ermit covers e. However, the permit coverage for the conveyed tot may be transferred or reassigned to a new owner or operator (see Parts F and G.1, above). i. CONSTRUCTION DEWATERING Construction dewatering water can NOT be discharged to surface waters or to storm sewer systems without separate permit coverage. The discharge of Construction dewatering water to the ground, under • the specific conditions listed below, may be allowed by the Stormwater Construction Permit when appropriate BMPs are implemented. Two options are available for managing uncontaminated Construction Dewatering water on a construction site. Construction Dewatering water discharged from the project site, to surface waters or to storm sewer systems, is considered a process water and requires an industrial process water permit. Applications for dischargers engaged in the dewatering of uncontaminated groundwater from a construction site are available from the Division's web site or by contacting the Division (see first page for address information). Alternatively, Construction Dewatering water may be discharged to the ground if all of the following conditions are met: 1) The discharge and the BMPs are included in the SWMP; 2) Adequate BMPs are included to control stormwater pollution; 3) The discharge does not leave the site as surface runoff or to surface waters/storm sewer systems; and 4) The groundwater being pumped is not contaminated so as to exceed State groundwater standards. If the above conditions are not met, a separate permit (see above) is needed for dischar es to the round and/or surface waters. Further information concerning Construction Dewatering, including what constitutes contamination of groundwater, can be found in the Stormwater Construction Permit and Rationale. These documents and others can be obtained from the Division's web site or by contacting the Division (see first page for address information). J. CONCRETE WASHOUT 3Concrete Washout water can NOT be discharged to surface waters or to storm sewer systems without se condictions listed below, may be allowed by the Stormwater Construction Permit when ratepermit coverage. The discharge of Concrete Washout water to the ground, under the specific pp appropriate BMPs are implemented. Concrete Washout water from washing of took and concrete mixer chutes may be discharged to the ground if alt of the following conditions are met: 1) The source is identified in the SWMP; 2) Adequate BMPs are included in the SWMP to prevent pollution of groundwater; and 3) These discharges do not leave the site as surface runoff or to surface waters/storm sewer systems. The use of the washout site should be temporary (less than 1 year), and the washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands. Concrete washout water must not be discharged to state surface waters or to storm sewer systems. Also, on -site permanent disposal of concrete washout waste is not authorized by this permit. Further information concerning Concrete Washout can be found in the Stormwater Construction Permit and Rationale. These documents can be obtained from the Division's web site at a►w.coloradowaterperrnits.com. Page 10 of 10 Revised 7-2015 COO Cherry Creek Drive S... Denver, CO 80246-1530 P 303-692-2000 www. Colorado. goof cdphe John :IL Hkkenlooper, Governor Larry Wok, MD, MSPH, Executive Director and Chief medical Officer i Hello