HomeMy WebLinkAbout20233498.tiff WELD COUNTY /0Z .-
CODE ORDINANCE 2023 - 16
IN THE MATTER OF REPEALING AND REENACTING
, WITH AMENDMENTS ,
CHAPTER 8 PUBLIC WORKS , OF THE WELD COUNTY CODE
BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF THE COUNTY OF
WELD , STATE OF COLORADO :
WHEREAS , the Board of County Commissioners of the County of Weld , State of
Colorado , pursuant to Colorado statute and the Weld County Home Rule Charter, is vested with
the authority of administering the affairs of Weld County , Colorado , and
WHEREAS , the Board of County Commissioners , on December 28 , 2000 , adopted
Weld County Code Ordinance 2000- 1 , enacting a comprehensive Code for the County of Weld ,
including the codification of all previously adopted ordinances of a general and permanent nature
enacted on or before said date of adoption , and
WHEREAS , the Weld County Code is in need of revision and clarification with regard to
procedures , terms , and requirements therein .
NOW, THEREFORE , BE IT ORDAINED by the Board of County Commissioners of the
County of Weld , State of Colorado , that Chapter 8 of the Weld County Code be , and hereby is ,
repealed and re-enacted , with amendments , to read as follows .
CHAPTER 8
PUBLIC WORKS
ARTICLE I - Snow and Ice Policy
Amend Sec . 8 - 1 -20 . Snow watch plan .
A . During normal working hours , sanding and/or plowing operations may be initiated by the
Director of Public Works or the Operational Divisionon -duty Snow Boss .
B . In order to ensure that sanding/plowing operations are initiated in a timely manner at other
than normal working hours , feedback regarding road conditions by Sheriffs Office
Deputies and any other agency , including the Colorado State Patrol , shall be sent to the
Weld County Regional Communications Center (WCRCC ) . The WCRCC shall then notify
the scheduled on-duty Snow Boss . The Snow Boss shall then initiate sanding/plowing
operations as per reportsaccordingly .
Amend Sec . 8 - 1 -30 . Snow removal priorities .
A . Priorities : Roads shalt be cleared inClearinq of roads shall occur according to the following
order of priority :
1 . thru 6 . — No change .
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7 . Remaining cCollector roads . - * .
8 . Local roads , including subdivisions and unincorporated towns .
B . Command and control .
1 . — No change .
2 . Control of operations shall be exercised at the Public Works Department
Operations Center ( PWDOC ) . Communications with regional supervisorsbetween
Snow Boss and operators shall be according to the following order of
priortymethods : 1 ) County Radio System ; 2 ) cell phone ; 3 ) CB radio . The Director
of Public Works shall be in charge of snow removal operations and shall staff the
PWDOC as necessary to carry out operations efficiently . This authority shall be
delegated to the assigned Snow Bosses .
3 . Any emergency calls for the Sheriffs Office , ambulance or helicopter
servicesemergency services received at the PWDOC shall be forwarded to the
appropriate agency .
4 . All incoming calls regarding snow removal or emergencies shall be routed to the
PWDOC ( 970-30'1 -6496) from dispatch or in - house Public Worksunless a specific
person is requestedstaff.
C . Operations .
1 . — No change .
2 . If weather information indicates that operations are anticipated in advance of the
approaching storm , the Director of Public Works shall direct specific operators to
be at work and ready to commence operations as soon as practical . If more than
two (2) days of continuous operations are anticipated , no operator shall work more
than twelve ( 12 ) hours in a day without approval of the Director of Public Works .
3 . Status of all snow removal operations shall be maintained at the PWDOC . Reports
shall be made to the Public Works Emergency Notification Group intermittently
throughout the snow event . These reports shall be directed by the Director of
Public Works or applicabieon -duty Snow Boss .
4 . - No change .
5 . If an abandoned vehicle is blocking the roadway , the operator shall radio in the
location , license plate number and description of the vehicle to the PWDOC . The
PWDOC shall contact the Regional Communications Center, informing the
Dispatcher that a hazard exists and the vehicle should be removed from the
County road right-of-way . Dispatch shall contact the Weld County Sheriff' s Office
for appropriate action .
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6 . No school property or private roads or driveways off the County rights -of-way shall
be cleared by County equipment , with the following exceptions :
a . If requested in writing , and approved in advance by a school district , the
County shall clear the entryand approved in advance by the Board of
County Commissioners .
b . — No change .
7 . Plow trucks shall primarily be used to remove snow and ice on paved roads and
shall be assignedhave designated routes or zones as dictated by the snow
distribution within the Countybut may be assigned otherwise as needed .
8 . Backup supportRepair and maintenance of all Public Works equipment shall be
furnished by the Weld County Department of Fleet Services
divisions to maintain and repair snow removal equipmentduring a snow event .
Personnel • • shall be on standby or on duty ; as directed by the
Director of Public Works and the Director of Fleet Services .
9 . — No change .
D . Planning and preparation .
1 . All supervisors of units providing snow removal are responsible for ensuring that
equipment is ready and personnel are briefed on their duties . Prior to the eta
snow event , each piece of equipment shall be inspected with its plow and spreader
to ensure readiness . All other equipment , such as tire and tow chains , route maps
and vehicle lights , shall also be inspected at this time .
2 . Fuel stocks at outlying grader stationssatellite facilities shall be monitored by the
individual zone operators immediately prior to a snow event and status reported to
the-O4rectorof Fleet Services . If a fuel delivery is necessary during a snow event ,
the Snow Boss may direct that the delivery route be cleared on a priority basis .
Amend Sec . 8 -1 -40 . Contracting for additional resources .
In cases of EXTREME EMERGENCY and where County resources cannot maintain safe
traveling conditions , it may be necessary to obtain additional equipment from Contractors .
A . Authorization for contract .
1 . — No change .
2 . The Director of Public Works or authorized agent of the Board of County
Commissioners shall
contractors , but in no case shall it exceed the maximum rates set by the most
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recent edition of the Colorado Department of Transportation . Equipment Rental
Rate Schedulefollow the emergency procurement process in Chapter 5 of the Weld
County Code .
B . Contracted equipment Ccommand and control . Control of contractor equipment shall be
exercised through the PWDOC . The Director of Public Works or the on -duty Snow Boss
shall coordinate and control the efforts of all contractor equipment .
C . Operations .
1 . County and contracted workforces shall be employed so as to maximize the
efficiency of the snow removal operation . Contracted equipment may be paired
with County equipment to take advantage of County radio control .
2 . As soon as it is apparent that County forces can handlemanage resources for the
remaining snow event , the Director of Public Works shall
terminate contractor operations .
3 . — No change .
4 . Contractors shall submit invoices to the Department of Public Works for validation
of to receive payment for time and chargescosts .
Amend Sec . 8 -1 -50 . Response plan for extreme snow and ice events .
The following policy sets in place criteria for managing snow and ice removal efforts on
the County roadway network during extreme exteme weather events .
A . Weather event definition . Snow events are categorized using a storm level scale based
on reports from the field as to the severity of conditions , as well as other methods ,
including forecasts , satellite images , weather stations and common sense . With the vast
expanse of Weld County , storm levels may vary depending on conditions in that area . The
levels of storms are defined below :
1 . Level 3 : Snow Removal Operations shall focus on all roads . The effort and
resources expended shall vary depending on accumulation and drifting conditions .
Code . Level 1 : Extreme weather conditions . Snow removal efforts shall cease , and
equipment shall retreat to designated recovery stations located throughout the
County for further instructions and redeployment as conditions warrant . Level 1
may be declared by the on -duty Snow Boss with the concurrence of the Director
of Public Works , the Commissioner Coordinator or Alternate Commissioner
Coordinator for Public Works . When redeployed , resources shall be committed to
predetermined priority snow routes . Notification of a Level 1 Condition or any road
closures shall be communicated to the Regional Communications Center and the
Public Works Emergency Notification List .
2 . Level 2 : Snow Removal Operations shall focus on predetermined priority snow
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routesremoval priorities as identified in Section 8 - 1 - 30 (A) . Some roads may be
closed and traffic rerouted so snow removal vehicles can operate unimpeded by
traffic . The on -duty Snow Boss shall refer to direction provided in- prior
sectionsSection 8- 1 - 30 of this Code .
3 . Level 1 : Snow removal efforts shall be ceased and equipment shall retreat to
and redeployment as conditions warrant . Level 1 may be declared by the on-duty
Snow Boss wi: i : le concurrence o- D+recor o! Pub is Woracs , - �e
Commissioner Coordinator or Alternate Commissioner Coordinator for Public
Works . When redeployed , o es hill be committed to predetermined priority
Condition or any road closures shall be
communicated to the Regional Communications Center and the Public Works
Emergency Notification List . Level 3 : Snow Removal Operations shall focus on all
roads . The effort and resources expended shall vary depending on accumulation
and drifting conditions . The on -duty Snow Boss shall refer to Section 8- 1 - 30 of this
Code .
Sec . 8 - 1 -60 . No waiver of governmental immunity .
No term or condition set forth in this Article shall be construed or interpreted as a waiver,
express or implied , of any of the immunities , rights , benefits , protections or other provisions , of
the Colorado Governmental Immunity Act , Section 24- 10- 101 , et seq . , C . R . S . , as applicable .
Furthermore , nothing set forth in this Article shall be construed as creating a duty of care upon
any individual or party
Add Sec . 8- 1 -70 . No expectation of service to any specific person or property .
The provisions stated in this Article are not intended to , nor shall they , create in any
specific person or property a right to expect a certain level of service , even if such level of service
is described herein .
Amend ARTICLE II — Reservedlmprovements Agreements
(Deleted by Weld County Code Ordinance 2010-5 )
Sec . 8-2- 10 . Reserved .
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Sec . 8 -2-20 . Improvements Agreements .
Depending on the land use project , there are several different types of possible
Improvements Agreements that may be required . It is the intent that Improvements Agreements
will be in place prior to final approval of the use . Construction of any safety improvements are
intended to be completed prior to operation or issuance of building permit(s ) .
A . An Improvements Agreement reference may be used interchangeably and include but is
not limited to immediate off-site and/or on -site improvements , future triggered
improvements , and road maintenance criteria . (All categories may or may not include a
proportional share based on locations and existing background traffic . )
B . Agreement Types include :
1 . Improvements Agreement ( IA) . This agreement is for projects that include future
triggered improvements . Typically includes a standard road maintenance section
for items such as dust suppressant or pavement damage repair . If applicable , will
include a proportional share component for any future improvements done by the
County on the haul or travel route .
2 . Offsite Improvements Agreement ( OFFSIA) . These agreements include immediate
off-site improvements . Immediate safety improvements may include but are not
limited to , adding auxiliary lanes , intersection improvements , paving of gravel road ,
or widening of a road . These agreements will require project and warranty
collateral and will also include all components described in the improvements '
agreements .
3 . On -Site Improvements Agreement (ONSIA) . These agreements require immediate
on -site improvements intended for public use but privately maintained , which may
include but are not limited to , dedication of rights-of-way for public use ,
construction of an internal roadway , and/or construction of irrigation or stormwater
ponds .
4 . Road Maintenance Agreement ( RMA) . A Road Maintenance Agreement includes
items addressing routine road maintenance , including but not limited to , dust
suppressant if on a gravel road and pavement damage repair if on a paved road .
There will also be a proportional share component for typical road maintenance
improvements performed by the County specifically identified to the haul and travel
routes related to the project .
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5 . Road Maintenance During Construction (RMCA ) . These agreements are similar to
the Road Maintenance Agreement but are limited in time . Often used for
transmissions lines , solar energy facilities and other land use projects where the
heavy traffic impact on the roads is limited to the construction of the facility/use .
These agreements will still include a proportional share component for routine road
maintenance improvements performed by the County on the haul and travel routes
related to the project . Pre and post construction inspections are required for these
agreements .
Sec . 8 -2-30 . Collateral .
A . Improvements Agreements requiring collateral as financial assurance that the obligations
of the Agreement will be completed ( including , but not limited to , Subdivision and
Development Improvements Agreements for major and minor subdivisions and
Development Improvements Agreements for Planned Unit Developments ) shall generally
conform to this Article II .
B . The County requires applicants to provide acceptable collateral to guarantee all of their
obligations under the associated Improvements Agreement in the following forms : ( 1 )
Proect Collateral for completion of all improvements described in the Improvements
Agreement ; and ( 2 ) Warranty Collateral to ensure all public improvements uphold their
functionality during the warranty period .
C . All references to "Acceptance of Improvements" shall refer to the County confirming
completion of the improvements according to the accepted Construction Plans . By
accepting any improvement , the County does not thereby accept it for purposes of future
maintenance , nor does the County accept any present or future responsibilities or
obligations relative to the improvements .
D . The Board of County Commissioners reserves the right to reject collateral that it deems
inappropriate or insufficient .
E . Release of collateral is the sole discretion of the Board .
Sec . 8 -2 -40 . Acceptable types of collateral .
The three ( 3 ) types of collateral listed below are acceptable to the County :
A . An irrevocable letter of credit from a federal - or state- licensed financial institution that has
at least a three-star rating given by Bauer Financial consistent with a sample form supplied
by the County . The Board may require the applicant to obtain replacement collateral if the
rating of the financial institution providing the collateral drops below this level , which shall
be submitted within sixty (60) days of the Board ' s notice to the applicant that the rating
has fallen and that the collateral must be replaced . The applicant may not terminate
existing collateral until replacement collateral has been secured .
1 . The letter of credit shall provide for payment upon demand to the County if the
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applicant has not performed the obligations specified in the Improvements
Agreement and the issuer has been notified of such default or if, after the County
has received notice that the letter will not be renewed as set forth below , the
County notifies the issuer that the applicant has not provided adequate
replacement collateral and the County intends to demand payment , regardless of
whether applicant is then in default .
2 . The issuer of the letter of credit shall guarantee that , at all times , the unreleased
portion of the letter of credit shall be available to the County for the purpose of
completing the uncompleted improvements enumerated in the Improvements
Agreement .
3 . The letter of credit must stipulate that it will automatically renew and shall remain
in full force and effect until released by action of the Board , or until after the Board
has received a minimum of sixty (60 ) days' written notice from the issuer of the
letter of credit of the pending expiration . The notice shall be sent by certified mail
to the Clerk to the Board .
B . A surety bond given by a corporate surety authorized to do business in the State and
having at least a B + rating given by A . M . Best . The Board may require the applicant to
obtain replacement collateral if the rating of the financial institution providing the collateral
drops below this level , which shall be submitted within sixty (60 ) days of the Board ' s notice
to the applicant that the rating has fallen and that the collateral must be replaced . The
applicant may not terminate existing collateral until replacement collateral has been
secured .
C . A cash deposit made with the Board .
Sec . 8 -2 -50 . Project Collateral .
A . The value of Project Collateral submitted to the County must be equivalent to one hundred
twenty-five percent ( 125% ) of the value of the improvements identified on the accepted
Construction Cost Estimate exhibit to the Improvements Agreement .
B . The Project Collateral shall be submitted with a signed Improvements Agreement
including all required exhibits . The complete submittal is subject to final approval by the
Board and shall be recorded at the Office of the Clerk and Recorder by the Clerk to the
Board upon approval .
C . Unless otherwise set forth in the Improvements Agreement Construction Schedule exhibit ,
the improvements shall be completed within three ( 3 ) years of execution of the
Improvements Agreement . Otherwise , the Board , at its discretion , may make demand on
all or a portion of the collateral and complete the improvements or partially complete the
improvements , which may include , at the Board ' s discretion , contracting to have the work
completed by a third party .
D . Project Collateral may be provided separately for on -site and off-site Improvements .
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Sec . 8 -2-60 . Release of Project Collateral .
A . Upon completion of the improvements in accordance with the Improvements Agreement ,
the developer shall notify Weld County , so staff may inspect the improvements .
B . Following preliminary approval by County staff, the developer shall present a Statement
of Substantial Compliance signed and stamped by a Colorado Professional Engineer
licensed to do business in the state and a request for release of collateral . The Statement
of Substantial Compliance shall certify the work has been completed in substantial
compliance with approved plans and specifications , or that any material deviations have
received prior written acceptance from the County , and the engineer or his or her
representative has made regular on -site inspections during the course of construction and
the construction plans utilized are the same as those accepted by the County .
C . "As- built" plans are required for all public improvements , which may include but are not
limited to , public rights-of-way , permanent easements , or on -site drainage features . As-
built" plans shall be stamped by a Colorado Professional Engineer licensed to do business
in the state certifying the project is in substantial compliance with the plans and
specifications and shall be submitted at the time the letter requesting release of collateral
is submitted .
D . For improvements to public rights-of-way or permanent easements , materials test results
must be submitted for all phases of the project , as per the Colorado Department of
Transportation ( CDOT) Schedule for minimum materials sampling , testing , and
inspections found in the CDOT Materials Manual .
E . If applicable , a letter of acceptance of maintenance and responsibility identifying all
improvements are in place and in accordance with the approved plans submitted from the
appropriate utility company , fire , water, and/or other special district , and/or municipality for
any utilities and improvements shall be submitted with the request for release of collateral .
F . The written request for release of Project Collateral shall be accompanied by Warranty
Collateral in accordance with Section 8-2 -70 , Warranty Collateral , below .
G . County staff shall schedule the request for consideration by the Board at a regularly
scheduled public Board meeting and notify the applicant of the hearing date and time . The
Project Collateral shall be released after final written acceptance by the Board .
Sec . 8 -2 -70 . Warranty Collateral .
A . Warranty Collateral shall be in an amount equal to fifteen percent ( 15 % ) of the value of
the improvements as shown in the Improvements Agreement , excluding improvements
fully accepted for maintenance by the responsible governmental entity , special district , or
utility company .
B . The warranty period shall be two ( 2 ) years from the date of the Board ' s consent to release
the Project Collateral .
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Sec . 8 -2 -80 . Release of Warranty Collateral .
A . Following the conclusion of the warranty period . the applicant shall submit a written
request for release of the Warranty Collateral to Weld County .
B . County staff shall inspect the improvements . If the improvements need mitigation or
repairs are required , said work must be completed prior to release of the Warranty
Collateral . In the event an applicant fails to adequately repair improvements associated
with the Improvements Agreement , the County shall have the authority to pursue , at its
sole discretion , Warranty Collateral to the extent necessary to complete the repairs in
order to preserve public interest .
C . If no improvements require mitigation or repairs , County staff shall schedule the request
for consideration by the Board at a regularly scheduled public Board meeting and notify
the applicant of the hearing date and time . The Warranty Collateral shall be released after
final written acceptance by the Board .
Sec . 8 -2-90 . Proportional Share Process for Improvements Agreements .
A . The proportional share process is an important tool used by the County to identify the
shared cost of safety improvements for existing and new development to mitigate impacts
to the county road system .
B . Weld County uses the Equivalent Single Axle Load ( ESAL) methodology when calculating
an Improvements Agreement proportional share . The ESAL methodology is a national
standard for normalizing traffic counts to reflect the actual damage caused by large
vehicles . The purpose of the methodology is to create the most reasonable and fair
method for analyzing traffic data and the impacts to county infrastructure .
C . Weld County maintains a current list of approved and recorded Improvements
Agreements . Annually , the Improvements Agreement haul , or travel routes are evaluated
to determine which roads will have proportional share costs for Weld County identified
projects the next calendar year and therefore, what owners/land use permits will be
affected so they can be notified in advance .
D . Once the Improvements Agreement permit holders are identified , Development Review
sends a courtesy letter notifying them of the anticipated proportional share associated with
their use . This letter is meant to be general in nature and will not contain specific costs or
percentages associated with the required contributions . It is meant to give permit holders
preliminary notice that a project will be occurring in the upcoming calendar year.
E . On or before December 31 of the year prior to the Weld County identified projects , the
permit holder will receive another letter giving the proportional share percentage with
supporting documentation . An estimated cost will also be provided at this time .
F . Permit holder shall have the opportunity to review supporting documentation , review ,
comment and supplement the County ' s data , collection methodology and determinations .
If the protect is completed by the Public Works Department , the proportional share will be
based on materials only . If the work is completed by a private contractor , the cost will be
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based on both materials and labor .
G . The final cost will be based on actual costs of the work performed and will be invoiced to
the permit holder at the completion of the project .
H . The County ' s criteria for calculating the ESAL proportional share is identified in Appendix
8-Q .
ARTICLE III - Road Access Culverts
Add Sec. 8-3 - 10 . Purpose .
For the purpose of this Article , culverts may refer to , road culverts , driveway/access
culverts , cross culverts , irrigation culverts , and similar structures that convey and maintain the
natural flow of water carried in the roadside ditches .
Amend Sec . 8-3-420 . Installation of access culvert.
A . The owner of the property owner shall pay the costs for materials and the cost of
installation for new road access culverts whenever the installation of a culvert is made
necessary by the creation of a new access from private property to a County road , by any
alteration of the natural flow of water across private property by the owner. or for any other
reason created by any owner of private property . The culvert shall be installed according
to she specifications of the Department of Public WorksAppendix 8-Q of the Weld County
Engineering and Construction Criteria as to size and location in the County rights-of-way
or other County property in which such culverts may be installed . Consideration of culvert
sizing shall be based on the existing upstream and downstream culvert diameter size . The
culvert size will be determined in accordance with standard engineering practices by
Public Works Operations at the time of culvert installation . The property owner shall be
responsible for cleaning the borrow or roadside ditch to the extent required to
accommodate the road access culvert and insuringensure proper drainage .
B . Property owner/user shall submit a Culvert Installation Form to Public Works for invoicing
of the materials of the culvert installation . Property owner/user shall provide payment prior
to culvert installation . The application form is available at Public Works .
Amend Sec . 8 -3-230 . Maintenance .
After county acceptance of the culvert installation , such owner or occupierWeld County shall be
responsible for the maintenance and repair of the road access and/or any related culvert . If, after
installation , such owner or occupier is notified of the need for maintenance or repair of the culvert ,
the own ve fifteen ( 15 ) days to make such repair
maintenance . he event o f the property owner' s failure to perform such maintenance , the
d for the protection of the
County roads and ~elated appu
ed maintenance or repair on the road
access or culvert within the time frame specified above . In the event of an emergency or if a
hazardous situation is observed or detected , the property owner shall be notified and requested
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to provide an immediate remedy to the situation . If the property owner fails to react , the County
shall correct the hazardous situation and may bill the property owner for all incurred expenses .
Add Sec . 8 -3 -40 . Maintenance of irrigation structures .
The County' s duty to maintain culverts , bridges or similar structures used for irrigation
purposes shall be in accordance with the following statutory requirements :
A . Section 43- 5-305 ( 1 ) , C . R . S . , which states as follows :
"Any person or corporation owning or constructing any ditch , race , drain , or flume in , upon ,
or across any highway shall keep the highway open for safe and convenient travel by
constructing culverts , bridges , or similar structures over such ditch , race , drain , or flume .
When any ditch is constructed across , in , or upon any highway , the person owning or
constructing such ditch shall construct a culvert , bridge , or similar structure long enough
to conduct the water from shoulder to shoulder from such road or highway or of such
greater length as the Board of County Commissioners having jurisdiction thereover may
require , plans for the culvert , bridge, or similar structure having been approved in advance
by the Board of County Commissioners . The Board of County Commissioners shall
maintain the culvert , bridge , or similar structure after construction , in accordance with the
provisions of Section 37 -84- 106 , C . R . S . "
B . Section 37 -84- 106 , C . R . S . , which states as follows :
"All bridges constructed over any ditch , race , drain , or flume , crossing any public highway ,
street , or alley , after construction , shall be maintained by and at the expense of the county
or municipality in which the ditch , race , drain , or flume may be situated . "
C . In the event of an emergency or if a hazardous situation is observed or detected , the
County shall notify the property owners/users to request the irrigation water be shut off in
con unction with property owners/users schedule, in order to perform emergency repairs .
If Public Works identifies this road as an essential travel or haul route , or inadequate
detour route availability and the property owner/users fails to react , the County shall
correct the hazardous situation and may bill the property owner/user for any incurred
expenses .
Amend Sec . 8 -3-350 . General conditionsCounty Authority .
Remainder of Section — No change .
ARTICLE IV - Use of Borrow or Roadside Ditches
Add Sec . 8 -4-10 . Purpose .
Borrow or roadside ditches are intended to intercept surface water from agricultural fields
or residential property . Roadside ditches are not intended to accommodate forced point source
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discharges . Tailwater ditches are not recognized as part of Weld County ' s conveyance system .
Amend Sec . 8 -4-120 . Duty of usersResponsibilities.
Whenever possible , the county shall try to separate agricultural farming operations out of
the county road right-of-way , especially when located in a municipal separate storm sewer
systems ( MS4 ) area . Persons in the County who are currently using borrow/roadside ditches
along County rights-of-way for irrigat agriculture uses , whether the consent to
such uses was originally given expressly or implied , may continue such uses if must adhere to
the following conditions are met :
A . thru C . — No change .
D . Tail water shall be controlled to prevent erosion and sedimentation of the borrow ditches .
Add Sec . 8 -4-30 . Maintenance .
A . Public works prioritizes and maintains Roadside Ditches on a case- by-case basis , as
needed , to remove sediment , debris , trash , or other encumbrance that may be impeding
the proper flow of water. Landowner' s or tenant' s may contact Public Works to request an
inspection of a Roadside Ditch . Public Works personnel will inspect and schedule the
Roadside Ditch to be cleaned , if deemed necessary . In the event drainage water overflows
a Roadside Ditch , Public Works personnel will inspect the Roadside Ditch and determine
if action , such as ditch cleaning , is required or if the event produced excessive runoff
beyond the capacity of the drainage system .
B . Roadside ditches are intended to carry stormwater from county roads to natural drainage
basins . The amount of stormwater a roadside ditch carries varies . For planning purposes ,
Weld County never assumes a roadside ditch can carry more water than five ( 5 ) cubic feet
per second ( cfs ) .
C . Nonexclusive License Agreements ( NELA ' s ) for private irrigation structures located in
county rights-of-way shall be done by separate Agreement on a case- by-case basis where
the Board grants a nonexclusive license to access , construct , operate , and/or maintain
privately owned equipment within county road right-of-way/property .
Amend Sec . 8 -4-240 . Violations .
If the Board of County Commissioners determines that users are violating the above-
stated conditions , the Board may consider the revocation of its prior consent , whether express or
implied . The revocation of consent may be entered by resolution of the Board of County
Commissioners , following notice to the owner and user ( if the user can be determined ) , and a
hearing held pursuant to the procedures for adjudicatory type hearings . The Director of Public
Works shall have the burden of showing , by a preponderance of evidence , that the owner and
user have failed to comply with Section 8-4- 1- 20 herein .
ARTICLE V - Cattle Guards
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Amend Sec . 8 -5- 10 . DefinitionPurpose.
Person includes any individual , business or corporation ; A person , who is not a
landowner, must demonstrate authority to act on behalf of the landowner prior to entering into any
agreement or receiving any services from the Countycoordination with the county on the
installation of cattle guards . Cattle guards are intended to restrict the movements of livestock and
are not intended to be used for drainage and utility purposes .
Amend Sec . 8 -5-20 . New installations/ Relocation .
Any person in the County who wishes to install a cattle guard on any County road may do
so only upon the following conditions :
A . Property owner/User shall submit a Cattle Guard Installation/Relocation Form to Public
Works for invoicing of the cost of the materials of the Cattle Guard installation/relocation .
Property owner/User shall provide payment prior to Cattle Guard installation/relocation .
The application form is available at Public Works .
AB . The entire cost of installation or relocation of a cattle guard is paid by the person making
the request with the County doing the installation/relocation , or by requester with the
County ' s written approval . Weld County will be responsible for maintenance and cleaning
of Cattle Guards after installation is completed .
BC . The Department of Public Works shall be notified prior to installation/relocation of a cattle
guard . An invoice will be sent and payment received in accordance with the written
agreement , • form attached in Appendix 8-C of this Chapters must be
received by the Department of Public Works must receive the form at least fi-fteenthirty
( 1530) days prior to the date of the installation/relocation .
GD . The agreement between the Department of Public Works and the person making the
request , detailing the rights and obligations concerning the cost of the Cattle Guard shall
be signed by the person making the application . mMaintenance and repair of the cattle
guards , shall be signed by the Weld County responsibility .
DE . Any cattle guard which is installed upon a in County road rights-of-way must comply with
any and all standards required by the Department of Public Works , including but not limited
to , the County' s Specifications for Cattle Guard Installation .
Amend Sec . 8 -5-30 . CleaningMaintenance.
A . Any person who benefits from any cattle guard located upon any maintained County road
has the responsibility to periodically inspect for maintenance . proper function and inspect
for cleaning . The person must notify Public Works within the same five ( 5) working days
in which the person obtains the knowledge of the the need for maintenance .
Cattle guard maintenance includes but is not limited to , clean the space within the
PAGE 14
2023-3498
ORD2023- 16
the removal
of all sand , dirt , silt and other solid debris which renders the cattle guard ineffective . The
county deems a cattle guard -cleaned when the space within the cement box and below
the grate of the cattle guard are free of debris .
Cattle Guard maintenance requests may be completed by the County within thirty ( 30 )
days of the request .
B . •
,
pay the cost of the cleaning prior to the work being done . The person requesting the
ment that he or she will conform to the provisions
C . C • t be completed within one ( 1 ) working day . The person
chall notify the Department of Public Works of his or her intention to perform the cleaning
prior to commencing the work . If the person believes that such cleaning is likely to extend
into the next working day , the person shall replace the grate of the cattle guard prior to
one-half ( 1/2) hour before sunset .
D . The road on w • ll be closed during the cleaning . The person
has the duty to place all signs necessary in order to warn oncoming motorists of the road
closure , using signs in accordance with the Manual on Uniform Traffic Devices . The
person may use signs provided by the county for such purposes .
The repair of any cattle guar the joint responsibility of the
he
labor for the repair and pay for materials to repair the metal grate , provided that the person
benefiting from the cattle guard pays for all other materials used in the repair.
B The maintenance of any cattle guard on any maintained County road shall be the
responsibility of the County .
C . In the event a Cattle Guard is deemed , by the County , to be beyond maintenance or repair ,
the County shall replace the cattle guard at the county ' s expense .
PAGE 15
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ORD2023- 16
Delete Sec . 8 -5-40 . ReplacementReserved .
A . In the event any cattle guard located upon any County road is deemed by the County to
be beyond repair, the cattle guard shall be replaced . The County shall pay for the entire
cost of said replacement .
B . Any person requesting the replacement of the cattle guard will provide written
acknowledgment that the person so requesting will conform to the provisions of the County
with the County's specifications for cattle guard installations . The entire cost of said
replacement shall be paid for by the person making the request for replacement .
Delete Sec . 8 -5 -50 . Notification of repair needReserved .
County road to notify the County of the need for repahr to the cattle guard . The person must notify
the County within the same five ( 5) working days in which the person obtains the knowledge of
the need for repair
Delete Sec . 8-5 -60 . Agreement for repairReserved .
periodic cleaning or assist in the repair and replacement of the cattle guard may be subject to the
to apply to the Board of County Commissioners within that ten-day period for a hearing pursuant
Amend Sec . 8 -5-70 . Vested right.
No portion of these policies shall be considered to have vested any person with the right
to a particular size of cattle guard . The County , upon a determination that road improvement or
widening is necessary , may require replacement of existing cattle guards . The county is
responsible for Cattle Guard costs . * ce with Section 8 5 40 above .
ARTICLE VI - Miscellaneous Provisions
Amend Sec . 8 -6 - 10 . Gravel pits .
The County shall obtain all required state and federal permits for Public Works operations .
A . Gravel obtained from County permitted gravel easements and sites shall not be sold or
used for other than governmental purposes , except by specific authorization of the Board
of County Commissioners .
PAGE 16
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ORD2023- 16
B . The County will acquire , in its name , all gravel mining permits for gravel mining on County-
owned property . When the property is not owned by the County , the issue of the obligation
to obtain , maintain and pay the costs of permits shall be addressed contractually .
Delete Sec . 8 -6 -20 . . ' Reserved .
ridges or similar structures used for irrigation
purposes shall be in a utory requirements :
A . Section 43-5-305( 1 ) , C . R . S . , which states as follows :
or across any highway shall keep the highway open for safe and convenient travel by
constructing culverts , bridges , or similar structures over such ditch , race , drain , or flume .
,
constructing such ditch shall construct a culvert , bridge , or similar structure long enough
to conduct the water from shoulder to sh *ghway or of such
thereover may
require , plans for the culvert , bridge , or simil ed in advance
by the Board of County Commissioner-s . The Board of County Commissioners shall
maintain the culvert , bridge , or similar structure ater construction , in accorcance wit -) tie
provisions of Section 37-84- 106 , C. R . S. "
B . Section 37-84- 106 , C . R . S . , which states as follows :
"All bridges constructed over any ditch , race , drain , or flume, crossing any public highway ,
or municipality in which the ditch , race, drain , or flume may be situated . "
Delete Sec . 8 -6 -30 . Permits for road and bridge operationsReserved .
The County will acquire , in its name , all gravel m • •
property . When the property is not owned by the County , the issue of the obligation to obtain ,
ssed contractually .
Delete Sec . 8 -6 -60 . Sign policyReserved .
A . The County sign shop shall produce signs for County-maintained roads in subdivisions ,
unincorporated areas and historic townsites ; where the signs are produced pursuant to a
separate i-ntergovernmental agreement with a governmental agency ; and for non-County-
making such requests .
PAGE 17
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ORD2023- 16
B . All signs placed in the County rights-of-way must conform to the Manual on Uniform Traffic
Control Devices . No signs , except those installed by the County , shall be located within
County rights-of-way and all signs ad}
and zoning codes .
Amend Sec . 8 -6 -70 . Grader shedSatellite Facility use .
accordance with the agreement entered into by the County and operator. GraderGravel Road
o perators may park personal vehicles in grader shedssatellite facilities while performing road
maintenance work for the County, . if the personal vehicle is not parked in the grader shed in lieu
of a County owned grader Any personal use of grader shedssatellite facilities by County
e mployees or any other individual except as specified above is prohibited by the Board of County
Commissioners .
Amend Sec . 8 -6-80 . Grader shedSatellite Facilities utilities and rents .
When the County owns the grader shedsatellite facility and a trailer pad , that item
associated with the grader shedsatellite facility will be provided at no cost . Electricity will be
and operates out of the grader shed . Other than as specifically stated herein , utilities of gas and
e lectricity shall not be provided to any grader operator in the County . Each operator will be
responsible for his or her own gas and electricity .
Amend Sec . 8 -6- 100 . Gravel road fugitive particulate emissions policy and procedure .
A . General . Growth throughout the County has led to increased vehicular traffic on all
roadways under the County' s jurisdiction . increased traffic on unpaved County roads has
resulted in dissatisfaction with the levels of fog+tive particulate emissions caused by
budgetary constraints to comply with regulations established by the State Air Quality
. as a result a fugitive dust application
may also be required for detour routes , or any other reason deemed appropriate by Public
Works .
B . Fugitive dust applications may be required if increased traffic on unpaved County roads
has resulted in dissatisfaction with the levels of fugitive particulate emissions caused by
vehicles traveling those roadways . The County must also make reasonable efforts within
budgetary constraints to comply with regulations established by the State Air Quality
Control Commission regarding this issue . In an effort to reasonably comply with air quality
regulations , the policies and/or procedures set forth in this Section will be adhered to when
considering requests for fugitive dust abatement .
BC . Responsibility for fugitive dust . The County- maintained roadway segments with Annual
Average Daily Traffic (AADT) volumes exceeding two hundred ( 200 ) vehicles per day
should be treated to inhibit fugitive dust at the expense of the County subject to available
PAGE 18
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ORD2023- 16
budgetary appropriations . The process for the determination of qualifying AADT volumes
will be as outlined in Subsection CD below . Roadway segments with AADT volumes below
two hundred ( 200 ) vehicles per day may also be treated for fugitive dust at the expense
of property owners in accordance with Subsection EF of this Section .
CD . Procedures for determination of traffic volumes in conjunction with fugitive dust issues .
1 . Routine counts . Traffic counts will be taken every three ( 3) y • tely
one thousand fi ) miles of as needed on gravel roadway
segments in areas of the County which are determined by the County to have
significant growth trends . When the forty-eight hour cou
will remain in place for up to sevent • ours .
2 . — No change .
3 . Traffic count procedure . All traffic--o
( 72 ) consecutive hours , averaged to establish a daily volume , and adjusted for
seasonal usage using the seasonal adjustment factor set forth in Appendix 8 -D to
this Chapter . The resulting AADT volume will serve as a guideline to determine
eligibility for County-funded fugitive dust control mitigation If the AADT count
exceeds two hundred (200 ) vehicles per day , the roadway segment will be
recounted in ninety ( 90 ) calendar days using the methods noted above to confirm
the original count . If this count is significantly below the two hundred ( 200) vehicles
per day AADT , the roadway may not be treated by the County for fugitive dust
control . When the County determines the use of weekend or partial weekend
counts could assist in establishing a representative average daily traffic count
when factored with weekday counts , the seventy-two- hour count may include
those time periods .
D . Determination of fugitive dust control mitigation . When a roadway segment meets the
criteria for County mitigation , the County may , when practical and within budgetary
constraints , select one ( 1 ) of the following alternatives to mitigate fugitive dust :
1 . — No change .
2 . gate ba : Full depth treatment
using dust control agents using no more than two (2 ) applications per year at the
County ' s discretion .
3 . Recycled asphalt treatment up to eight- inches ( 8" ) and may also include a dust
control agent , per Public Works discretion .
34 . Asphalt or concrete Ppaving , based upon qualification though the Capital
Improvement Project prioritization process .
45 . Speed limit reductions .
PAGE 19
2023-3498
ORD2023- 16
Delete 5 . Periodic watering . 5 . Period+c watering .
The mitigation alternative and time of implementation will be based on budget and
seasonal constraints . The County will confirm the need for continued mitigation on roadway
segments by conducting annual traffic counts using the procedures noted above and maintaining
historical traffic count records . Should the AADT on a road segment fall below two hundred ( 200 )
vehicles per day , dust control mitigation may be discontinued by decision of the Board of County
Commissioners . Public Works .
E . Private application . The County has no objection to individuals applying dust control
chemicals to County roads at their own expense , provided that they agree to the following
conditions :
1 . — No change .
2 . Used oil may not be usedPrivate application shall not include used oil applications .
3 . Dust control chemicals must be applied in such a manner that will not contaminate
any roadside ditches . Therefore , any materials which may wash
from the roadbed will not be suitable .
4 . — No change .
5 . All dust control agents used on County roads shall be approved for use by the
Department of Public Health and Environment and the Department of Public
Works . '
for use . The County rese delete materials from the aporovec
road for purposes of dust control , not specifically identified in the approved list of
materials , shall be approved for use in writing from the Department of Public Health
and Environment and the Department of Public Works prior to its application .
6 . — No change .
7 . _ All private application must be applied by a Weld County approved vendor , who
must obtain a county right-of-way use permit .
PAGE 20
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ORD2023- 16
Amend Sec . 8 -6-110 . Survey monuments .
A . — No change .
B . In order to avoid having surveyors dig holes in thepaved road intersections to locate the
monuments , the monument should be enclosed in a box which is kept flush withat least
one-quarter inch ( 1 /4" ) below the roadway surface .
1 . thru 5 . — No change .
C . For gravel roads , the monument shall be located at least one ( 1 ) foot below the roadway
surface .
D . On concrete paved roadways the monuments shall be surface mount type CDOT class
section 629 , type 5 ( Brass ) and shall be recessed 1 /2 " below the surface .
Amend Sec . 8 -6 - 130 . Trees in rights -of-way .
A . — No change .
B . It is the policy of the County that when trees on private property begin to obstruct visibility
on County roads , the property owner shall be given notice to trim the trees within a
reasonable time_- : property owner.
Remainder of section — No change .
Delete Sec . 8-6 - 140 . Road striping .Reserved .
A . The County' s roads require certain striping , per the Manual on Uniform Traffic Control
Devices . The County has •
provide minimum services .
B . The County may provide er or edge str g on arterial or collector roads when
ety ..
Sec . 8 -6-150 . Road maintenance acceptance policy for public roads .
Persons desiring to obtain County maintenance of public roads shall first address such
request to the Board of County Commissioners for its consideration at one ( 1 ) of its regularly-
scheduled business meetings . The person making the request shall be responsible to pay the
entire cost of notification to owners and/or occupants of lands lying adjacent to the roadway . Such
notification shall include a description of the request and shall set forth the time and place of the
Board consideration . County maintenance of public roads may occur only if authorized by
resolution of the Board of County Commissioners . Before a public road may be authorized by the
Board for maintenance , the road must meet the following minimum conditions :
A . and B . — No change .
C . The width of the road right-of-way shall not be less than sixty ( 60) feet .
PAGE 21
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ORD2023- 16
D . The road shall serve a minimum of ##reke-(3)five ( 5 ) legal lots , which must have residential
dwellings , be developed with residential , commercial or industrial improvements to be
considered for acceptance . Properties abutting the intersection of the road under
consideration for acceptance and an existing publicly maintained road do not count toward
the required three ( 3)five ( 5) lots .
E . TheAny new road width shall be a minimum of twenty-six (26) feet of graveled surface or
meet the minimum design guidelines for the anticipated traffic on the roadway segment
being considered .
F . The following shall be the minimum acceptable standards before a road is accepted for
maintenance :
1 . — No change .
2 . Borrow ditches shall be a minimum of twenty-four ( 24 ) inches deep with 34 : 1 side
slopes and graded to provide adequate drainage on a case by case basis .
3 . All driveway side road borrow ditches shall be sufficient to carry the five-year storm
or be a minimum of an eighteenfifteen - inch-diameter culvert or culvert size based
on the upstream and downstream culvert size as determined by the Director of
Public Works . Crossroad drainage structures shall be sufficient to carry the ten -
year storm or be a minimum of an eighteenfifteen-inch culvert as determined by
the Director of Public Works .
4 . The Department of Public Works shall test and inspect the roadbed subgrade for
structural adequacy and acceptable materials , in accordance with the most current
versions of the CDOT Field Materials Manual , reference CP 23 , and the Standard
Specifications Book SECTION 203 EXCAVATION AND EMBANKMENT . The
0
the Director of Public Works .
5 . A minimum of four (4) inches of compacted surface gravel meetingin accordance
with Table 9- 12 of the Weld County Engineering & Construction Criteria found in
Appendix 8-Q . Colorado Department of
material must be provided on the traveled surface . The gravel shaEl be compacted
in accordance with RASH
G . There shall be no fences or other obstructions within thecounty road right-of-way . If cattle
have cross-access to the roadway , a cattle guard shall be installed in accordance with the
County cattle guard policyArticle V above .
PAGE 22
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ORD2023 - 16
H . If a fence exists along the section line on which the road is to be built , relocation of the
fence to the county road right-of-way lines shall be the responsibility of the sponsor(s) of
the roadway project .
I . Reimbursement by the persons requesting authorization of County maintenance of public
roads shall be made for acreage within the county road right-of-way included in an
adjacent property Conservation Reserve Program ( CRP ) crop or which has an
unharvested annual crop demolished by the roadway construction project .
Remainder of section — No change .
Amend Sec . 8 -6-170 . Obstructions within county rights-of-way .
The County reserves the right to maintain its road rights-of-way without obstructions
located thereon . Obstructions include , but are not limited to , fences , trash cans , gates.,
landscaping materials , and irrigation structures , and any structure that does not meet the intent
of being constructed with breakaway materials , regardless of whether or not they are physically
located on the traveled portion . Obstructions shall be removed from the County road rights-of-
way upon request by the Department of Public Works . The total expense of the removal of any
obstruction from a County road right-of-way will be paid by the person who installed the
obstruction , or by the person exercising ownership or control over the obstruction . In the event
such person does not remove the obstruction as requested , the County will remove the
obstruction and bill the person responsible for the obstruction for any expenses incurred in its
removal . This Section shall not alter any rights , responsibilities and/or penalties regarding the act
of obstructing highways as set forth in Sections 18-9- 107 and 43- 5-301 , C . R . S .
Delete Sec . 8 -6 - 180 . Memorial signsReserved .
consent of the victim ' s family , utilizing the form set forth in Appendix 8-L . Upon submittal
of a Roadside Memorial Sign Appl+cation with fee to the Department of Public Works , the
Coun
years after the date of installation . After the four (4) years , the sign shall be returned to
the applicant at the address shown on the application . If the application is not accepted
by the County , the fee shall be returned to the applicant . No private installation or
maintenance is allowed . The memorial sign sha -1 consist of two (2 ) signs and shall appear
like those set forth in Appendix 8-M .
B . Memorial signs shall only be installed by the County on County-maintained rights-of-way .
e as possible to the location
given in the application . If that location conflicts with existing signs or creates an unsafe
condition , the sign will be moved to where it can be installed safely . If the roadway is
annexed by a loc
lity for the sign to remain ; otherwise, the County will remove
th sign if req ieste � by +he annex envy and return it to the applicant .
••
PAGE 23
2023-3498
ORD2023- 16
to help cover the sign ' s cost , installation , maintenance and removal by the County . In a
multiple-fatality crash , the fee should be split equally between those families who want
their family members' names on the sign . Once removed , each separate family shall
ro�oiio � cinr� to Itanrs
nty' s permitting system for roadside memorial
signs and is in lieu of the procedural requirements of Section 43-2- 149 , C . R . S .
Amend ARTICLE VII - Reserved Signs and Pavement Markings
Sec . 8 -7-10 . Purpose .
The County ' s roads require certain pavement markings and signs per the Manual on
Uniform Traffic Control Devices , and Colorado state statute . The pavement markings and signs
are to serve the public interest in traffic safety .
Sec . 8 -7 -20 . Sign policy .
A . The County sign shop shall produce signs for County-maintained roads in subdivisions ,
unincorporated areas and historic townsites ; where the signs are produced pursuant to a
separate intergovernmental agreement with a governmental agency ; and for non-County-
maintained roads upon request and payment of the cost of the ( blue ) signs by the persons
making such requests .
B . All signs placed in the County rights-of-way must conform to the Manual on Uniform Traffic
Control Devices ( MUTCD ) . No signs , except those installed by the County , shall be
located within County rights-of-way and all signs adjacent to rights-of-way must meet
applicable building and zoning codes .
Sec . 8-7-30 . Memorial signs .
A . The memorial sign must be requested by the victim ' s family or other sponsor with the
consent of the victim ' s family through an application . Upon submittal of a Roadside
Memorial Sign Application with fee to the Department of Public Works , the County shall
review application for acceptance . The application form is available at Public Works .
1 . If accepted , the Department of Public Works shall construct , install , and maintain
the requested roadside memorial sign for four (4 ) years after the date of
installation . After four (4 ) years , the sign shall be removed and held for a period
of thirty ( 30 ) days to provide the applicant the opportunity to pick up the removed
sign for keeping . Signs not claimed within the thirty ( 30 ) day period will be
recycled .
2 . If the application is not accepted by the County , the fee shall be returned to the
applicant . No private installation or maintenance of roadside memorial signs is
allowed .
B . These memorial signs shall consist of two ( 2 ) sign panels measuring standard dimensions
in accordance with the MUTCD .
PAGE 24
2023- 3498
ORD2023- 16
1 . There are four (4 ) alternative messages for the top sign panel . These messages
correspond with the type of accident or situations that occurred during the accident .
The four (4 ) messages are :
a . " Please Drive Safely" — this is the most common message used for these
signs .
b . " Please Ride Safely" — this message is for accidents involving motorcycles
or bicycles .
c . " Please Buckle Up" — this message is for accidents involving victims who
were not wearing their safety restraints .
d . " Don 't Drink and Drive " — this message may only be used for fatal
alcohol/drug ( DUI ) related accidents where there has been a conviction of
the driver involved in the fatal crash who was in violation of Colorado DUI
laws , or a toxicology report showing the victim driver to have been in
violation of Colorado ' s DUI laws .
2. The bottom sign panel will include the message " In Memory Of' and the victim ' s
name as shown in the application . The bottom sign panel can show multiple
names if there were multiple victims in the accident and each of those victims '
immediate family gives permission for the names to be added in the application .
C . Memorial signs shall only be installed by the County on County-maintained rights-of-way .
The Department of Public Works shall install the sign as close as possible to the location
given in the application . If that location conflicts with existing signs or creates an unsafe
condition , the sign will be moved to where it can be installed safely . If the roadway is
annexed by a local municipality after installation , the applicant will be required to receive
permission from that municipality for the sign to remain ; otherwise , the County will remove
the sign if requested by the annexing agency and return it to the applicant . Removed
signs shall be held for a period of 30 days to provide the applicant the opportunity to pick
up the removed sign for keeping . Signs not claimed within the thirty ( 30 ) day period will
be recycled .
D . The applicant shall submit a fee , as determined by the Board of County Commissioners ,
to help cover the sign ' s material cost , installation , maintenance , and removal by the
County . In a multiple-fatality crash , the fee may be split equally between those families
who want their family members' names on the sign . Once removed , each separate family
may receive a sign to keep if requested . Removed signs shall be held for a period of 30
days to provide the applicant the opportunity to pick up the removed sign for keeping .
Signs not claimed within the thirty (30) day period will be recycled .
E . This section is considered to be the County' s permitting system for roadside memorial
signs and is in lieu of the procedural requirements of Section 43-2 - 149 , C . R . S .
PAGE 25
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ORD2023- 16
ARTICLE VIII - Transportation Planning
Add Sec. 8-8 -10 . General .
Transportation planning for Weld County is a continuing , cooperative , and comprehensive
process that includes the development of planning documents , working with regional agencies ,
securing funding for transportation projects , and reviewing safety data . Weld County collaborates
with many different regional agencies in order to plan and implement needed improvements to
the transportation system . Planning of the roadway network with respect to functional
classification , alignment , and intersection/access spacing is developed through transportation
planning . Weld County will continue to build and maintain a safe and reliable transportation
system through prudent transportation planning .
Add Sec . 8-8 -20 . Purpose .
The purpose of this Article is to identify transportation planning policies , as well as the
guiding technical documents for Weld County for the basis of formulating transportation planning
related policies .
Amend Sec . 8-8430 . Weld County Transportation Plan and Functional Classification Map.
A . The Weld County Transportation Plan , as amended ( "Transportation Plan " ) , is intended
to summarize existing transportation conditions , recommend policy , funding and roadway
development for the County over a twenty-five-year planning horizon . The Transportation
Plan will serve an integral part in the decision - making process for County staff and elected
officials . i ation that can be
used as a basis for formulating transportation related policies . The Transportation Plan
will also be an extension of the Comprehensive Plan focusing on basic travel
characteristics unique to the County . The Transportation Plan is found in Appendix 8- N of
this Chapter and is intended to be used in concert with Chapter 22 of this Code . It is
recommended to update this plan when updating the Comprehensive Plan .
B . The Functional Classification Map is a component of the Transportation Plan and is the
process by which County roads are grouped into classes according to the character of
service provided . Grouping the roads into classes identifies the required minimum width
of future road right-of-way and locations for future road right-of-way reservation_ . It is
recommended to update The Transportation Plan recommends the Functional
Classification Map every two ( 2 ) years be reviewed every two to three years , and can be
amended by the Board of County Commissioners , as needed . A link to Tthe Functional
Classification Map is found in Appendix 8-O of this Chapter .
C . The minimum road right-of-way widths are as follows , unless shown otherwise on the
Functional Classification Map found in Appendix 8-O of this Chapter :
1 . Arterial : 140 feet . Arterials may include planned roundabouts or other traffic
features that necessitate expanded road right-of-way width as shown in arterial
studies adopted by the Board of County Commissioners by resolution .
PAGE 26
2023-3498
ORD2023- 16
2 . Collector: 80 feet .
3 . Local : 60 feet . All roads maintained by Weld County have a minimum of 60 feet of
road right-of-way .
4 . Minimum road right-of-way widths for "Arterials Not Constructed " shown on the
Functional Classification Map found at Appendix 8-0 of this Chapter are found in
project identifications and/or designs approved by resolutions of the Board of
County Commissioners by resolution .
5 . Minimum road right-of-way widths for Weld County four- lane controlled -access
highways detailed in C . R . S . Section 43-2 - 110 are identified in approval
documents .
D . Where road right-of-way has not been dedicated or otherwise acquired by the County , but
the County maintains a public road , the width of the prescriptive road right-of-way , which
includes the entire area necessary for maintenance by the County , shall be a minimum of
60 feet ( 30 feet from either side of the center of the road ) .
E . Weld County identifies primary and secondary roadway classifications , as required by
C . R . S . §43-2 - 101 . Each year, the Weld County Department of Public Works submits a
map to COOT showing the Weld County Primary and Secondary Road System and the
total miles of public roads maintained by Weld County and eligible for participation in the
HUTF , pursuant to the requirements of C . R . S . §43-2- 110 ( 1 ) .
Delete Sec . 8-8 -240. ,
. Reserved .
Eight (
nal Communities 1-25 Corridor Plan (the " Plan") ,
side of 1 -25 for a distance of five ( 5) miles , beginning at WGR 40 and extending northward to
,
the transportation systems along said portion .
ARTICLE IX - Municipal Separate Storm Sewer System
Amend Sec . 8 -9 -50 . Definitions .
For the purpose of this Article , the following terms , phrases , words and their derivations
shall have the meanings given herein :
Construction dewatering permit means the Colorado Discharge Permitting System
(CDPS ) General Permit COG0 80000 , Construction Dewatering Discharges , which is regulated
by the Colorado Department of Public Health and Environment , Water Quality Control Division .
Add Development area means the area of land disturbance , including past and future
PAGE 27
2023-3498
ORD2023- 16
phasing . When multiple lots are involved , such as a subdivision of land , the potential cumulative
land disturbance will be considered the development area for the purposes of drainage design .
Stormwater means any surface flow , runoff and drainage occurring during or following any
form of natural precipitation event and resulting therefrom and consisting entirely of water from
natural precipitation events including snowmelt .
Remainder of section — No change .
Amend Sec . 8 -9 -80 . Pre-construction .
A . — No change .
B . Pre-construction requirements . The following documents are required to be submitted and
accepted by the Department of Public Works prior to any land -disturbing activity that will
disturb greater than or equal to one acre of land . Applicable land -disturbing activity
includes the total disturbed area . either planned or potential . from a common plan of
development or sale . The Department of Public Works shall determine applicable sites
and required documentation necessary to comply with MS4 Permit requirements .
1 . thru 4 . b . — No change .
c . Drainage report ; identifying the following components : site drainage ;
design details for permanent control measures ; narratives for non -
structural control measures , if applicable ; and corresponding calculations
used in determining compliance with the " Base Design Standards " of the
MS4 permit .
" Base Design Standards" are detailed in the Weld County Engineering and
Construction Criteria document ( Sec . 5 . 13 , Stormwater Quality/MS4
Requirements)Manual (Appendix 8-Q , Sec . 6 . 2 . 6 . 2 — Permanent Water
Quality Control Measure Design ) .
d . thru f. — No change .
C . Enforcement . Failure to comply with this Section is a violation of this Article and
enforcement procedures shall be pursued as detailed in Section 8- 9- 130 . Additionally , a
' hold ' may be placed on the applicable parcel (s ) , which prevents future permitting of the
site until requirements are met .
Amend Sec . 8 -9 -90 . Construction activity .
A . thru B . 2 . b . — No change .
Delete c . Indicator inspection : An indicator (drive-by ) inspection may be
conducted every 'ourteen ( 1-4 ) days witn a routine i-nspection every ninety
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ORD2023- 16
( 90) days . Indicator inspections do not requi-re the presence of the owner
and/or operator and are usuall
a history of compliance .
dc . Inactive site inspection : An inactive site inspection is conducted at least
every ninety ( 90) days . Inactive site inspections are reserved for sites
pending final stabilization , and all construction activity has been completed .
Detailed inspection procedures can be found in the Weld County Engineering and
Construction Criteria document ( Sec . F . 1 St water Quality/MS4
Requirements) . Manual (Appendix 8-Q , Sec . 6 . 2 . 5 . 1 — Stormwater Inspections ) .
C . — No change .
D . Enforcement . Failure to comply with this Section is a violation of this Article and
enforcement procedures shall be pursued as detailed in Section 8-9- 130 . Additionally , a
` hold ' may be placed on the applicable parcel (s ) , which prevents future permitting of the
site until requirements are met .
Amend Sec . 8 -9-100 . Post-construction .
A . Purpose . The purpose of this Section is to require the implementation and maintenance
of permanent control measures to ensure post-
construction requirements of the MS4 permit are met . All control measures shall be
selected , installed , implemented and maintained in accordance with good engineering ,
hydrologic and pollution control practices . This Section applies to all land -disturbing
activities commencing after July 1 , 2019 .
B . Post-construction requirements . The following requirements are applicable to sites for
which construction activity has create-dwill create a disturbed area greater than or equal
to one acre and sites which will have a cumulative disturbed area greater than or equal to
one acre during future phasing . The requirements are applicable to individual sites as well
as sites that are part of a larger common plan of development or sale . For subdivisions ,
the potential development area will be considered unless otherwise platted . The
Department of Public Works shall determine applicable sites and required procedures and
documentation necessary to comply with MS4 permit requirements .
1 . Permanent control measures .
a . — No change .
b . " Base design standards" can be found in the Weld County Engineering and
Construction Criteria . ,
Requirements)Manual (Appendix 8-Q , Sec. 6 . 2 . 6 . 2 - Permanent Water
Quality Control Measure Design ) .
c . — No change .
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2 . As- built submittal .
a . After instal . construction
of drainage is complete , a certified as- built drawing , signed and stamped
by a Professional Surveyor and licensed Professional Engineer in the State
of Colorado , shall be submitted to the Department of Public Works to be
recorded .
3 . Final inspection and acceptance .
a . After receiving the as- built , the County shall inspect the site to verify
compliance with the Drainage Report , Drainage and Access Easements ,
Long -Term Operation and Maintenance Plan , and other submitted
documentation . If the Department of Public Works determines the site has
met the requirements of this Section , the owner will be notified in writing of
site will be allowed to obtain
a Certificate of Occupancy ( CO ) . Otherwise , the parcel will remain on hold
until all requirements have been met .
4 . Post-acceptance oversight .
a . Inspections of permanent control measures . Inspections shall be
conducted at least every five ( 5 ) years , or an alternative frequency
determined by the Department of Public Works , to ensure adequate long -
term operation and maintenance of permanent control measures . The
County Inspector shall verify the permanent control measure with the
recorded as- built and long -term operation and maintenance plan . If the
inspector is unable to visually verify adequate functioning and maintenance
of the permanent control measure , additional requirements may apply .
Additional requirements may be avoided by installing structural
components , such as a concrete trickle channel , which allows visual
verification of adequate functioning and maintenance .
4 . b . thru 5 . — No change .
C . Exemptions .
1 . — No change .
2 . A list of allowable exemptions under the MS4 permit can be found in the Weld
County Engineering and Construction Criteria document ( Section -5 . 13 ,
Stormwater Quality/MS4 Requirements )Manual (Appendix 8-Q , Sec. 6 . 2 . 6 . 1 —
Exemptions) . The most common exemptions are as follows :
a . Large- Lot Single- Family Sites : A single-family residential lot , or agricultural
zoned lands , greater than or equal to 2 . 5 acres in size per dwelling and
having a total lot impervious area of less than 10 percent . A total lot
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ORD2023- 16
imperviousness greater than 10 percent may be allowed when a study
specific to the watershed demonstrates the expected soil and vegetation
conditions are suitable for infiltration/filtration of the WQCV for the site .
The maximum total lot impervious covered under this exclusion shall be 20
percent .
b . Undeveloped Land : Sites with land disturbance to undeveloped land ( land
with no human- made structures such as buildings or pavement) that will
remain undeveloped .
c . Above Ground and Underground Utilities : Activities for installation or
maintenance of underground utilities or infrastructure that does not
permanently alter the terrain , ground cover, or drainage patterns from those
present prior to the construction activity . This exclusion includes , but is not
limited to , activities to install , replace , or maintain utilities under roadways
or other paved areas that return the surface to the same condition .
D . Enforcement .
1 . Failure to comply with this Section is a violation of this Article and enforcement
procedures shall be pursued as detailed in Section 8-9- 130 . Additionally ,
noncompliance may result in an ` MS4 hold ' and may be placed on the applicable
parcel (s) , which prevents future permitting of the site until the parcel (s )
requirements are met .
Amend Sec . 8 -9 -130 . Enforcement procedures .
A . — No change .
B . Informal notice of violation . Except where a threatened discharge exists and/or emergency
suspension is necessary , the Department of Public Works shall attempt to provide an initial
informal notice to a person violating this Article . Such notice shall specify the location , type
and severity of the violation and request that such person take immediate action to
address the violation . Notices of violation are followed by compliance inspections to
ensure the violation has been resolved . Failure to correct the violation within the specified
time may result in a formal notice of violation . In the event reasonable efforts to
communicate the informal notice to such person are unsuccessful , a formal notice of the
violation shall be issued by the Department of Public Works .
Causes for informal notices of violation include , but are not limited to :
1 . Minor issues of timproper handling , storage or disposal of potential stormwater
pollutants ;
2 . and 3 . — No change .
C . Formal notice of violation . If the violation for which informal notice was given has not been
resolved within fourteen ( 14 ) days of such notice , and no plan for corrective action has
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ORD2023- 16
been communicated , and except where emergency suspension is necessary , the
Department of Public Works shall provide a formal notice of violation to persons violating
this Article . Formal notices of violation are also issued for recurring violations and/or
violations more severe in nature . Notices of violations are followed by compliance
inspections to ensure the violation has been resolved . Recurring violations may result in
fees being assessed in accordance with Section 8-9- 140 and/or enforcement methods
being pursued in accordance with Section 8-9- 150 .
Causes for formal notices of violation include , but are not limited to :
1 . thru9 . — Nochange .
Such notice shall describe the nature of the violation and may require without limitation :
1 . thru 4 . — No change .
If abatement of a violation and/or restoration of affected property are required , the notice shall set
forth a reasonable deadline within which such remediation and/or restoration must be completed .
The written notice of violation shall be served by email or hand delivery or by certified mail , return
receipt requested .
Remainder of section — No change .
ARTICLE XI - Storm Drainage Criteria
Division 1 - General Provisions
Amend Sec . 8 - 11 -10 . Intent.
A . The intent of the Weld County Storm Drainage Criteriachapter is to provide minimum
standards to preserve and protect the public health , safety and general welfare in the
unincorporated lands of the County , pursuant to authority granted by Part 4 of Article 15
of Title 30 , and Article 35 of Title 30 , C . R . S .
Remainder of section — No change .
Amend Sec . 8 -11 -20 . Definitions .
For the purpose of this article , the following terms , phrases , and words and their
derivations shall have the meanings given herein :
Retention pond/Stormwater Infiltration facility: A flood control feature designed to
temporarily store stormwater runoff and reduce peak flows . Retention ponds return water to the
watershed through infiltration into the ground .
Remainder of section — No change .
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ORD2023- 16
Amend Sec . 8 - 11 -30 . Adoption of storm drainage standards .
A . The Urban Drainage andMile High Flood Control- District' s " Urban Storm Drainage Criteria
Manual , " ( UDFCDMHFD Manual ) consisting of Volume 1 , Volume 2 , and Volume 3 , as
currently published or hereafter amended , is hereby adopted by reference , with the
amendments and additions which are set forth herein . All references to " District" or "The
District" within the UDFCDMHFD Manual shall be replaced with "Weld County" . The
All
facilities for stormwater management on properties located within the unincorporated
lands of the County , whether public or private , shall be designed and constructed in
accordance with such criteria , unless a master drainage plan specific to the area of the
site has been approved by the County . The Weld County Storm Drainage Criteria shall be
available on the Weld County Public Works Department' s Website .
B . The criteria and procedures contained in this article are intended to supplement the
1-DFCDMHFD Manual in ways specific to Weld County . In the case of a conflict between
the IDFCDMHFD Manual and the supplemental criteria and procedures in this article ,
such supplemental criteria and procedures shall take precedence over the UDFCDMHFD
Manual .
C . Further guidance for stormwater design and construction shall be in accordance with
Chapter 5 of the Weld County Engineering and Construction Criteria .
Amend Sec . 8 -11 -40 . Drainage policy .
A . — No change .
B . For new development , un -detained discharges to roadside ditches located in the County
road right-of-way are prohibited .
C . and D . — No change .
E . Public WorksWeld County shall review and approve new development in accordance with
the storm drainage criteria of this article .
F . — No change .
G . Irrigation ditches shall not be used as outfall points for stormwater runoff from Uses by
Special Review , Site Plan Reviews , Subdivisions , or Planned Unit Developments , or
WOGLAs unless such use is approved , in writing , by the ditch owner(s ) . Water quality
treatment may be required .
H . An as- built survey of stormwater facilities shall be provided if requested by Public
WorksWeld County .
Add Sec. 8-11 -45. Exceptions .
tA . Exception criteria . Exceptions to stormwater detention shall not jeopardize the public
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ORD2023- 16
health , safety , and welfare of public and private property . No stormwater detention will be
required for sites that meet any of the following conditions . Requirements of the Municipal
Separate Storm Sewer System ( MS4) areas remain applicable . Public WorksWeld County
will confirm if the development qualifies for an exception based upon the information
provided by the applicant . Exceptions requests shall be supported with an approved
drainage narrative , which must describe the following at -a- minimum criteria :
1 . Any existing and proposed improvements to the property . The exception being
requested for consideration .
2 . The exception being requested for coneideration . Any existing and proposed
improvements to the property .
3 . thru 8 . — No change .
Exceptions . Uses that can be excepted from to the stormwater detention shall beare
limited to the following uses :
1 . thru 5 . — No change .
6 . Gravel pits if the stormwater drains into the gravel pit . Releases from the site shall
comply with the Weld County Storm DrainageEngineering and Construction
Criteria , including dewatering . Topographical information shall be provided .
7 . Residential developments with no historic flooding where all the following
conditions exist. This exception shall be supported by calculations provided by the
Applicant . Additional information may be requested and will be signed and
stamped by a Colorado Licensed Professional Engineer:
a Nine ( 9 ) lots or fewer.
b . The averageminimum lot size is equal to , or greater than , three ( 3 ) acres
per lot .
Delete c)_ Downstream roadway criteria are not exceeded .
criteria are not exceeded .
dci„ The total post-development imperviousness for the rural residential
development does not exceed ten percent ( 10 % ) , assuming that all internal
roads and driveways are paved or will eventually be paved .
8 . Development of sites where the change of use does not increase the
imperviousness of the site . Note : This exception cannot be applied to sites where
impervious surfaces were added for, or in conjunction with , a business that is/was
operating in violation and/or without the required Weld County land use permit .
9 . the total pre-existing and post development
for the ' hour, 100 year , storm- event . This exception shall be supported by
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ORD2023- 16
A parcel of land or project site where the "total developed stormwater runoff' from
the 100-year, 1 -hour storm is less than , or equal to , five ( 5) cfs . The "total
developed stormwater runoff' includes cumulative runoff from the proposed project
site plus runoff from any previously developed project site on the subject parcel .
A project site is the area of land that lies within the project' s limits of disturbance
during construction . This exception shall be supported by calculations signed and
stamped by a Colorado Licensed Professional Engineer .
10 . In -fill development Pparcels with total area less than , or equal to , one ( 1 . 0) gross
acre .
11 . An individual parcel with an unobstructed flow path and no other parcel ( s ) between
the channel within a Federal Emergency Management Administration ( FEMA)
regulatory floodplain channel and the project .
12 . A parcel greater than one ( 1 ) gross acre and less than , or equal to , five (5) gross
acres in size is allowed a onetime exception for a new t-wefour thousand ( 24 , 000 )
sq . ft. buildingof 100 % impervious area or equivalent imperviousness . (See
Appendix 8-Q in the Weld County Engineering and Construction Criteria Manual
for impervious value percentages ) .
13 . A parcel greater than five ( 5 ) gross acres in size is allowed a onetime exception
for a new feminine thousand five hundred (4 , 59 , 000 ) sq . ft . buildingof 100%
impervious area or equivalent imperviousness . ( See Appendix 8-Q in the Weld
County Engineering and Construction Criteria Manual for impervious value
percentages ) .
14 . No change .
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ORD2023- 16
Amend Sec . 8 -11 -50 . Rainfall .
The designer shall use the most appropriate and best available data for the project area
in determining the rainfall quantities . The applicant shall utilize local rainfall data from the National
Oceanic and Atmospheric Administration ( NOAH) unless otherwise approved by Public
WorksWeld County . The use of synthetic rainfall distribution data is not permitted .
Amend Sec . 8 -11 -60 . Runoff.
A . The Rational Method should not be used to determine runoff for basins larger than one
hundred sixty ( 160) acres . In areas located in the southwest portion of Weld County ,
where areas are larger than one hundred sixty ( 160 ) acres that have drainage
characteristics similar to an urban area
<CUHP ) is an acceptable model for determining runoff amounts . The CUHP model can
be used for basins from zero ( 0) to three thousand ( 3 , 000) acres. The parameter
adjustments provided in the runoff chapter of the UDFCD Manual (Volume 1 ) should be
SWMM
is required .
Delete B . rban areas , including those areas in Weld
Amend Sec . 8 -11 -70 . Street drainage for use by special review, commercial , industrial ,
planned unit development and residential subdivisions .
A . — No change .
B . Inlets .
1 . The design guidelines provided in the streets/inlets/storm sewers chapter of the
UDFCDMHFD Manual (Volume 1 ) should be used when designing stormwater
inlets . The standard inlets permitted for use in Weld County streets/roads are
shown in the following table :
Remainder of 1 . and 2 . ( including both tables) — No change .
C . Pipes .
1 . The design guidelines provided in the streets/inlets/storm sewers chapter of the
UDFCDMHFD Manual (Volume 1 ) should be used when designing stormwater
pipes .
Remainder of section — No change .
Amend Sec . 8 - 11 -80 . Major drainage .
PAGE 36
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ORD2023- 16
A . — No change .
B . Open Channel Design Principles .
1 . Grass- lined open channels conveying less than fifty ( 50) cfs may reduce the
minimum 1 . 0-foot freeboard requirement to the freeboard required to convey 1 . 33
times the 100-year design flow . The reduced freeboard may only occur if a 1 . 0-
foot minimum freeboard is not physically possible and a variance request
iscalculations are submitted and accepted by Weld County .
2 . Maximum side slopes may be as steep as 31-1 : 1V . -If slopes are greater than 4H : 1 V
the design engineer s .
Generally , channels and swales should be no steeper than 4 : 1 . If steeper slopes
are required due to site constraints , the design engineer shall address how the
channel will be maintained .
Amend Sec . 8 -11 -90 . Culverts in publicCounty road right-of-way .
A . Sizing .
1 . The applicant shall contact the Department of Public WorksWeld County to
determine which types of storm sewer pipes are permissible for use in
publicCounty road rights-of-way or public drainage easements .
2 . — No change .
B . Materials . Culverts that are to be installed in a publicCounty road right-of-way that is
routinely burned must be made of either concrete or metal . Plastic pPipes made of
flammable materials ( such as PVC or HDPE ) will not be allowed in publicCounty road
rights-of-way that are subject to weed burning .
Amend Sec . 8 -11 - 100 . Storage .
A . Detention Criteria .
1 . and 2 . — No change .
3 . Off-site flows can be routed as followsover the spillway or routed around the site . ;
Delete a . Over the spillway ; or
Delete b . .
4 . The elevation of the top of the detention pond embankment , except at the spillway ,
must be a minimum of 1 -foot of freeboard above the 100-year water surface
elevation in the detention pond .
5 . Outlet workestructures should be sized and structurally designed to release at no
more than the 1 - hour, 5-year historic release rate in urbanizing drainage areas and
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ORD2023- 16
1 - hour, 10-year historic release rate in non - urbanizing drainage areas without
structural or hydraulic failure . Historic is defined as an undeveloped site with a
2 . 0 % imperviousness . The outlet pipe must contain a minimum of two concrete
cutoff walls embedded a minimum of eighteen ( 18) inches into undisturbed earthen
soil . The cutoff walls must be a minimum of eight ( 8 ) inches thick . The outlet pipe
bedding material must consist of native earthen soil , not granular bedding material ,
to at least the first downstream manhole or daylight point .
6 . — No change .
7 . In order to prevent damage to publicly-owned infrastructure {roads , roadside
ditches ) , aA concrete cutoff wall eight (8 ) inches thick , three ( 3 ) feet deep , and
extending a minimum of five ( 5 ) feet into the embankment on each side of the
emergency spillway opening , is required on all privately- maintained detention
ponds and required on all regional detention ponds . The concrete cutoff wall
permanently defines the emergency spillway opening . The emergency spillway
elevation must be tied back into the top of the embankment using a maximum
slope of 4 : 1 .
8 . and 9 . — No change .
B . Retention Criteria .
1 . thru 3 . — No change .
4 . The design of the retention facility must provide evidence that the pond will drain
through the bottom ( sides slopes cannot be used m calculation ) in accordance with
C . R . S . 37 -92-602 ( 8) , as amended when only draining through the bottom of the
pond ( side slopes cannot be used in the calculation ) . A retention pond that can
cause injury to water rights or is in violation of state or federal law will not be
accepted .
C . Erosion Protection Design Criteria . Erosion protection for storage facilities needs tomust
be designed to prevent erosion and ensure that the sediment does not leave the site or
impact downstream properties . It maywill be necessary to install straw bales , riprap ,
erosion control logs , erosion blankets , etc . on the storage facility side slopes to
ensure that erosion does not occur leave erosion control measures in place until one
season of growth and the reseeded vegetation is establishedsite reaches final stabilization
( 70 % vegetative cover) . The Control Measures/BMPs outlined in the 1JDFCDMHFD
Manual (Volume 3 ) should be used .
Amend Sec . 8 - 11 - 110 . Revegetation .
A . Weld County utilizes the information provided in the Revegetation Chapter of the
UDFCDMHFD Manual (Volume 2 ) , and the Best Management Practices Chapter of the
UDFCDMHFD Manual (Volume 3 ) . Weld County has highly recommended seed mixes
that are applicable to specific areas of the County . These seed mixes can be found in the
Weed Management Section of under the Weld County Public Works Website Weed
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ORD2023- 16
Management Section . If noxious weeds , as defined by the State of Colorado , exist onsite ,
the appropriate steps shall be tak , ,
their spread . Noxious weeds shall be controlled on site , pursuant to Chapter 15 , Articles I
and II , of the Weld County Code .
B . Seeding and Planting . In addition to the site preparation guidelines outlined in the
revegetation chapter of the UDFCDMHFD Manual (Volume 2 ) , if mulching with straw , the
straw must be free of seeds and weeds .
Amend Sec . 8 -11 - 120 . Stormwater quality .
A . A water quality feature is intended to improves the quality of stormwater runoff resulting
water quality from the impacts of site development . A water quality feature can be an
existing low spot on th-ea property that currenttynaturally collects water, or it can be an
excavated area on a property that has been excavated to capture stormwater runoff. The
required water quality capture volume requiredof a feature is based uponon the site ' s size
and imperviousness .
to collect and setti
or downstream waterways . A properly sized feature will capture and hold stormwater
runoff for the period of time necessary for contaminants to settle out before stormwater
runoff is allowed to exit the site .
B . An accepted methodology for a water quality feature design can be found in the
UDFCDMHFD Manual , Volume 3 , Best Management Practices .
Remainder of section — No change .
Amend Sec . 8 -11 - 130 . Control measures .
Weld County uses the Control Measures/BMPs that are outlined in the U-DFCDMHFD
Manual (Volume 3) Best Management Practices .
Amend Sec . 8 -11 - 140 . Maintenance .
A . Culverts located outside of County- maintained road rights-of-way are not maintained by
Weld County . The owners of those culverts are responsible for their maintenance . Culverts
that are part of a subdivision drainage plan are maintained by the respective homeowner' s
association . Those culverts should be maintained and cleaned out annually , per the
drainage report maintenance plan , or on an as- needed basis to ensure proper drainage
of the subdivision .
B . thru D . — No change .
E . Areas designated for stormwater storage , retention , or detention are not to be used for
storage of materials , building , or parking , or modified without approval from the
Department of Public WorksWeld County .
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ORD2023- 16
Amend Sec . 8 -11 -160 . Stormwater drainage criteria variances .
The variance procedure is intended to address cases of hardship . Relief from the
provisions of this article may not be granted when the hardship is brought about solely through
the actions of the appellant . No relief may be granted when the result of granting the requested
relief is detrimental to the public health , safety , and general welfare or when the relief is contrary
to the purpose and intent of this article . In granting any variance , the Department of Public
WorksWeld County may prescribe appropriate conditions and safeguards in conformity with this
article . Violation of such conditions and safeguards , when made a part of the terms under which
the variance is granted , shall be deemed a violation of this article .
The variance request shall be stamped and signed by a professional civil engineer
licensed to practice in the State of Colorado . Requests will be reviewed by the Public Works
Director or his/her designeeproper Weld County designee . In order to be granted , the variance
request must meet the criteria as specified in Chapter 12 of the Weld County Engineering and
Construction Criteria (Appendix 8-Q of the Weld County Coder
Delete A . thru E .
A . Describe the design criteria of the Weld County Code of which a variance is being
requested .
B . Describe the proposed alternative with engineering rationale which supports the intent of
the Weld County Code .
C . Meet the design intent of the Weld County Code .
D . Demonstrate that granting of the variance will still adequately protect public health , safety ,
and general welfare .
. , ,
of way and/or off-site properties as a result of the project .
Remainder of section — No change .
ARTICLE XII - Grading Permit Policy
Amend Sec . 8 -12 -10 . General .
The Grading Permit is a tool to ensure that the County has reviewed proposed grading
plans and erosion and sediment control practices for planned construction activities with the goal
of avoiding potential damages and risks to the public . A Grading Permit grants the Permit Holder
permission to conduct construction activities within the requirements of applicable state
regulations and provides the County with sufficient oversight to minimize the potential for offsite
damages . In addition , construction activities in the County must be compliant with applicable state
regulations regarding releases of sediment and water from construction sites . This policy shall
apply within all unincorporated areas of the County as of the effective date of this Article .
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ORD2023- 16
Amend Sec . 8 - 12 -20 . Purpose .
This Article recognizes the importance of protecting the health , safety and welfare of the
public , safeguarding County infrastructure , and the protection of water quality and private property
rights . This Article describes the minimum requirements for prevention of detrimental or negative
impacts to County water quality and damages to private property and County infrastructure by
construction activities within the County . The goals are :
A . thru C . — No change .
Add D . To identify and eliminate any preventable damages to County infrastructure caused by
construction activities .
Add E . To ensure compliance with all Federal , State , and County laws and regulations pertaining
to grading and water quality .
Amend Sec . 8 - 12-30 . Grading Permit.
A . Issuance of Grading Permit . A Grading Permit shall be issued only in compliance with the
rules and regulations set forth in this Article . In no event shall construction be allowed or
permitted if it is detrimental to the public health , welfare and safety or the grading and/or
sediment and erosion control plans indicate that the construction activities will be out of
compliance with Federal or State laws and regulations .
B . - No change .
C . No Work Without Permit . No person or entity may surface disturb , grade , construct or
excavate over one ( 1 ) acre of nonexempted ground without first having obtained a Grading
Permit from Weld County . In addition , no person or entity
may grade , excavate , construct or leave disturbed and unstabilized over one ( 1 ) acre of
nonexempted ground beyond the date or dates specified in the Permit unless : ( 1 ) the
person or entity requests a written extension before the expiration of the initial Permit ; and
(2 ) a new Permit or extension is granted . It is a violation of this article to perform this work
without a permit .
D . Exemptions . The following land disturbance activities are permissible without obtaining a
Grading Permit , unless otherwise located within a designated Municipal Separate Storm
Sewer Systems ( MS4) area . The Department shall determine if the exemption is in
accordance with the County' s MS4 permit . Other permits , such as right-of-way , flood
hazard or OWTS , may still be required .
1 . thru 4 . — No change .
5 . County capital improvement or County maintenance projects within a road right-
of-way and temporary construction easements (TOE ) .
6 . — No change .
7 . Maintenance and resurfacing of existing streets/roads , parking/outdoor storage
PAGE 41
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ORD2023- 16
areas , runways , and sidewalks/trail systems .
8 . Performance of emergency work necessary to prevent or mitigate an immediate
threat to life or property when an urgent necessity arises . The person performing
such emergency work shall promptly notify the Department of Public WorksWeld
County of the problem and work required . Any person performing such emergency
work shall immediately notify the Public Works DirectorWeld County of the
situation and the actions taken . The Weld County Public Works and/or Planning
Services Director may , however , require such person to obtain a Grading Permit
to implement remedial measures to minimize erosion resulting from the
emergency .
9 . and 10 . — No change .
11 . Land disturbance associated with the construction of natural surface trails may be
exempted by the Director of Public WorksWeld County except within designated
MS4 areas , provided that the procedure outlined in this Article is completed prior
to commencement of any trail construction . If exempted , the land disturbance
associated with the construction of natural surface trails shall generally conform
with the performance standards of this Article .
Amend Sec . 8 - 12 -40 . Definitions .
For the purpose of this Article , the following terms , phrases , words and their derivations
shall have the meanings given herein :
Add Construction dewatering permit: means the Colorado Discharge Permitting System
( CDPS ) General Permit COO080000 , Construction Dewatering Discharges , which is regulated by
the Colorado Department of Public Health and Environment , Water Quality Control Division .
Add Construction stormwater permit: means the Colorado Discharge Permitting System
( CDPS ) General Permit COR400000 , Stormwater Discharges Associated with Construction
Activity , which is regulated by the Colorado Department of Public Health and Environment , Water
Quality Control Division .
Right-of- way (ROW) : means a strip of land that is dedicated or granted through an
easement , plat or other legal mechanismto and accepted by Weld Couonty for transportation
purposes , such as a roadway or highway , whether maintained or non - maintained by Weld County .
The term is used as both singular and plural .
Add Stormwater construction permit: is the state- issued permit for construction activity
disturbing one (1 ) acre or more, including disturbance less than one ( 1 ) acre but is part of a larger
common plan of development or sale .
Amend Sec . 8 -12 -50 . Grading Permit application .
A . Complete Application Required . Applicants shall file a complete application for a Grading
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ORD2023 - 16
Permit . Based upon the information provided in the application , additional submittals may
be required by the Department of Public WorksWeld County if sufficient information was
not provided for review of the application . An application shall be considered complete if
it is submitted in the required form , includes all mandatory information , including all
supporting materials specified by application , and is accompanied by the applicable fee .
If an application is determined to be incomplete , the Department of Public Works-Weld
County shall provide notice to the applicant , along with an explanation of the application ' s
deficiencies . No further processing of the application shall occur until the deficiencies are
corrected in a future resubmittal . An application which is determined to be incomplete may ,
or may not , retain its same processing cycle .
B . A complete application will typically include civil engineering drawings signed and sealed
by a registered Civil Engineer in the State . The drawings shall include a grading plan
showing(with existing and proposed contours . ancispot elevations , and earth balance
when requested ) , and drainage plan . In addition , a Sediment and Erosion Control Plan
that shows the location and types of control measures to be utilized at the site shall be
provided . Typical control measure installation details and maintenance notes should also
be on the drawings .
C . — No change .
Amend Sec . 8 - 12 -60 . Application review, Grading Permit issuance , permit expiration and
permit extension .
A . Review Process . The application and other data filed by an applicant for a Grading Permit
shall be reviewed by the Department of Public WorksWeld County . The application may
also be reviewed by other departments or agencies to verify compliance with any
applicable laws . If the Department of Public •W$cksWeld County finds that the work
described in an application for a Grading Permit conforms to the requirements and
regulations set forth in this Article and meets the requirements defined in the Weld County
Engineering and Construction Criteria Manual (Appendix 8-Q ) or other pertinent laws
regulations or ordinances , and that all required fees have been paid , a Grading Permit
shall be issued to the applicant . Criteria upon which the Grading Permit shall be
considered include , but are not limited to , the following :
1 . thru 3 . — No change .
B . Changes in Approveda Weld County Grading Permit . An approvedWeld County Grading
Permit shall not be changed , modified or altered without written authorization from the
Department of Public WorksCounty . All work shall be done in conformance with the
approved Permit issued .
C . Permit Limitations . An approvedWeld County Grading Permit requires the Permit Holder
to meet certain permit specifications and general engineering standards . The Department
of Public WorksWeld County shall be responsible for ensuring compliance with such
specifications and standards . The issuing and granting of the Grading Permit shall not be
construed to be a permit for, or an approval of, any violation of any of the provisions of
this Article or of any Federal , State or County regulations of the State or County .
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Additionally , the issuance of the Grading Permit shall not be construed as the approval or
issuance of any necessary permits referred to in this Code .
D . Indemnification . Every approvedWeld County Grading Permit issued shall include the
following language : " Permit Holder, its agents , employees , subcontractors , contractors
and assigns hereby agree to hold Weld County , Colorado , the agencies thereof and their
officers and employees harmless from any and all loss and damage or any claims which
may arise out of, or be connected with , the construction within the area covered by this
permit ; excluding any such loss and damage or any claims ( including consequential
damages) which may be caused solely by the negligence of Weld County , the agencies
thereof or its officers and employees . "
E . — No change .
F . Permit Expiration . Every approvedWeld County Grading Permit shall expire one ( 1 ) year
from the issuance of the permit . If the permit has expired , the Grading Permit must be
reissued by the County before work can begin or be resumed .
Prior to the expiration or closure of the Grading Permit , the disturbance shall be stabilized ,
and non - permanent control measures shall be removed .
G . Permit Extension . Any Permit Holder with an unexpired Grading Permit may apply , in
writing , for an extension of the time within which work may begin under that Grading Permit
if the Permit Holder is unable to begin or complete work within the time required for good
cause , and that the cause is acceptable to the Department of Public WorksWeld County .
There shallmay be an extension fee assessed to cover administrative costs .
Amend Sec . 8 -12-80 . Permit Holder' s general responsibilities .
A Permit Holder is responsible for the following items . Additional requirements and more
detailed information are shown in the Special Provisions of the Grading Permit .
A . Control Measures . The Permit Holder shall ensure that all erosion and sediment control
measures shown on the approvedaccepted plans are correctly installed and maintained .
B . Other Permits . The Permit Holder shall secure all permits required by federal , state and
local agencies . Written documentation from an outside agency stating that the grading
activities do not require an agency permit shall be provided to the County when requested .
C . — No change .
D . Surety . If deemed necessary by the Department of Public Works or the Planning
DepartmentWeld County , the Permit Holder shall provide a surety bond and/or other
security for the total amount required to stabilize , restore or reclaim the disturbed ground
to prevent erosion and/or release of sediment , excessive storm water and/or pumped
water discharges to surface waters from the construction area . Said security shall remain
in effect for a period of twenty-four (24 ) months after all completion of construction and
establishment of erosional stability . The amount of the security shall be sufficient to
stabilize a disturbed site to prevent releases of sediment and water from construction sites
and protect the health , safety and welfare of the public . The amount shall be based on
PAGE 44
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ORD2023- 16
cost estimates of site restoration provided by the applicant and approvedaccepted by the
County Engineer. Whether or not covered by surety , the Permit Holder shall reimburse the
County for any and all expenses incurred by the County within twenty-four (24 ) months
after completion of any work as a result of, or related to , failure by the Permit Holder to
perform all installation , construction , maintenance or other work pursuant to the Grading
Permit , in a workmanlike manner.
E . — No change .
F . Traffic Control . Construction activities impacting the County rights-of-way shall not
interfere with movement of traffic or compromise public safety . A County Right-of-Way
Use Permit may be required in addition to a Grading Permit .
G . Emergency Conditions . When a condition arises where emergency work must be
performed , the applicant shall immediately notify the Department of Public WorksCounty
of the emergency event , type and extent of work . Within two (2 ) business days after the
occurrence of the emergency , the applicant shall apply for the necessary permits , pay the
associated fees and fulfill the rest of the requirements necessary to comply with the
Grading Permit for the actions the applicant took in response to the emergency .
H . — No change .
Site Stabilization , Restoration and Cleanup . The Permit Holder shall assume all
responsibility for stabilizing the permitted site to prevent erosion and discharges of
sediment . The Permit Holder shall also assume all responsibility for removing all debris
associated with the construction activities in the County rights-of-way and all non-
permanent control measures . If, upon inspection , the Department of Public WorksCounty
determines that there is risk of erosional damage , or sediment discharges or debris has
not been removed from the County rights-of-way , the Department of Public WorksCounty
shall notify the Permit Holder of the violation of the Grading Permit conditions . The Permit
Holder, upon notification from the Department of Public WorksCounty , shall correct all
work to the extent necessary . The work shall be completed within the time period specified
in the notice from the Department of Public WorksCounty . If the Permit Holder fails to
establish site stability or restore the rights-of-way in the manner and to the condition
required , the Department of Public Works may have the County may perform the
restorations . In that event , the Permit Holder shall pay to the County , within thirty ( 30) days
of billing , the cost of restoring the County rights-of-way .
Remainder of section — No change .
Amend Sec . 8 - 12 -90 . Inspections .
A. Inspections during the construction period may be made by the Department of Public
Works County to ensure that work is progressing in compliance with the Grading Permit .
It shall be the responsibility of the Permit Holder to provide safe access to the work site
for the Department of Public WorksCounty and to all others , as authorized by law , for
inspection at all reasonable times during the execution and upon completion of the work .
At the time of inspection , the Department of Public WorksCounty may order the immediate
PAGE 45
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ORD2023- 16
termination of any work which involves the unauthorized exportation of material , or which
poses , or is causing , a serious threat to the life , health , safety or well - being of the public .
B . It shall be the responsibility of the Permit Holder to notify the
WorksCounty when work is ready for inspection . The Department of Public WorksWeld
County requires that every request for inspection be received at least forty-eight (48 ) hours
before such inspection . Such requests may be made by telephoning , or emailing or faxing
the Department of Public WorksPlanning Services . The presence of Department of Public
WorksCounty employees on -site shall not guarantee or qualify the Permit Holder' s
performance . The approvedWeld County Grading Permit must be available on - site for
review by Department of Public WorksCounty staff. Failure to comply may result in
suspension of the Grading Permit .
C . The Department of Public WorksTo ensure compliance with this Article , the County may
make , or require , other inspections and/or testing of any work as deemed necessary to
Work performed without the
required inspections shall be subject to removal and replacement at the Permit Holder' s
expense , regardless of the quality of the work . Any inspection hours required outside of
the normal working hours will be paid for by the Permit Holder . Certain types of work may
haverequire continuous inspection_ and , w When large scalesuch projects exceed the
ability of the Department of Public WorksCounty ' s ability to provide ample inspection , the
Permit Holder will incur the cost offal- providing a private inspection firm to conduct
inspectons as needed . This third - party inspector will be appointed by the Department of
Public WorksCounty prior to issuance of the Grading Permit .
Amend Sec . 8 - 12 - 110 . Appeal of denial of Grading Permit.
If an application for a Grading Permit is denied by the Department of Public WorksCounty ,
or if the applicant objects to any of the terms or conditions of a permit thereby placed by the
Department of Public WorksCounty , the applicant has the right to appeal the decision to the Board
of County Commissioners . in writing . utilizing the appeal procedures set forth in Section 2 -4- 10 of
this Code .
Amend Sec . 8 - 12 - 120 . Failure to comply with terms of grading permit.
A . The issuance of the Grading Permit based on plans , specifications or other data shall not
prevent the Department of Public WorksCounty from requiring the correction of errors in
the plans , specifications and other data , or from stopping excavation or construction
operations being conducted in violation of this Article or any other state or County
regulations . Failure of the applicant to comply with any of the terms and conditions of the
Grading Permit shall be sufficient cause for cancellation of the Grading Permit .
B . The Permit Holder shall prevent releases of sediment and water from construction sites
that have the potential to cause damage to private property or County- maintained
infrastructure . In the event that construction activities result in erosion or sediment and
water discharges causing damage , the Permit Holder shall immediately attempt to prevent
further harm , install or replaceby installing or replacing appropriate control measures and
correct any unsatisfactory work .
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ORD2023- 16
C . Right-of-Way Damage . The Permit Holder shall correct any unsatisfactory work , including
but not limited to defects in removal , replacement or pavement patching . Actions to
remedy unsatisfactory work may include the patching and/or the removal and replacement
of defective pavement . Other actions may be required . If the Permit Holder fails to restore
the County rights -of-way in the manner and to the condition required by the Department
of Public Works , or fails to satisfactorily and timely complete all restorations required by
the Department of Public Works to a same or better condition , or in a timely manner, the
County shall have the right to perform the restorations at the expense of the Permit Holder .
Amend Sec . 8 -12- 130 . Permit suspension or revocation .
A . The Department of Public WorksCounty may deny , revoke or suspend any Grading Permit
in order to protect the public health , safety and welfare . Permit Holders hold Grading
Permits as a privilege . The County reserves itsthe right to revoke any Grading Permit
without a fee refund whenever the Permit is issued in error, or on the basis of based on
incorrect information supplieoprovided by the applicant , or whenever the Permit may have
beenis issued in violation of any provisions of this Article .
B . The grading permit will be suspended shouldit the Department of Public WorksCounty
determines that the Permit Holder has committed a substantial breach of athe terms or
conditions of any statute , ordinance , rule , or regulation _ or any condition of the Grading
Permit itself. , the Department of Public Works shall Weld County will notify the Permit
Holder of itsthe Grading Permit suspension by either a-- phone Gall or in writing , and
mandate that the Permit Holder must then remedy the violation . The demand shall state
that continued violations may be cause for revocation of the Grading Permit . Further, a
substantial breach shall allow the Department of Public WorksCounty to place additional
or revised conditions on the Grading Permit .
PAGE 47
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ORD2023- 16
C . Within twenty-four (24) hours of receiving notification of the suspension , the Permit Holder
shall contact the Department of Public VVorksCounty with a plan of correction which must
be accepted by the Department . The Permit Holder' s failure to contact the Department of
Public WorksCounty , failure to submit an acceptable plan :_ or failure to reasonably
implement the approvedaccepted plan shall be cause for immediate revocation of the
Grading Permit and termination of work . Upon revocation of the Grading Permit , the Permit
Holder will be required to re-apply for a new permit and will be charged for any additional
fees that may be applicable .
Amend Sec . 8 -12-140 . Penalties .
A . Violations and Penalties . The County , through the Departments of Planning Services and
Public Works or other County departments so authorized , may enforce this Article through
methods included in this Article or through other methods adopted by the Board of County
Commissioners .
Remainder of section — No change .
ARTICLE XIII - Right-of-Way Use Permit Policy
Amend Sec . 8 - 13 -10 . General .
The County strives to keep its road right-of-way in a state of good repair and free from
unnecessary encumbrances . The Right-of-Way Use Permit is a tool to regulate and permit the
use of Weld County' s public road right-of-way by private companies , municipalities and/or special
district constructing and burying lines either crossing or running parallel within Weld County road
right-of-way . Crossings are allowed for all lines . Parallel installations are allowed for lines of
" public utilities" that are defined in C . R . S . § 40- 1 - 103 and are "domestic or foreign electric light
power, gas , or pipeline companies" holding current Certificates of Public Convenience and
Necessity issued by the Colorado Public Utilities Commission ; for water lines of municipalities ,
water districts , and water and sewer districts ; for transmission lines or pipelines used solely for
agricultural purposes ; for fresh water above-ground transfer pipelines ; and for lines in non -
maintained road right-of-way if approved by Weld County based upon locational factors , such as ,
surrounding population density , topography , or if the road right-of-way provides access to a
recorded exemption lot , and with Permittee' s agreement to move the line at its sole expense if
Weld County or an annexing municipality intends to improve the road right-of-way ; or if authorized
by the Board of County Commissioners in an appeal of the denial of a Right-of-Way Use Permit
application , pursuant to Section 8- 13- 110 , below . Public road right-of-way subject to regulation
by the Right-of-Way Use Permit includes Weld County' s maintained and non - maintained road
right-of-way , and all public drainage easements . A Right-of-Way Use Permit grants the Permittee
and its Contractors permission to occupy designated County road right-of-way . The Permit
authorizes excavation , surveying , and/or construction of facilities within the County road right-of-
way and provides for their subsequent restoration upon completion of the Project . This Policy
shall apply within all unincorporated areas of the County .
Amend Sec . 8 - 13 -20 . Purpose .
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This Article recognizes the importance of protecting the health , safety and welfare of the
traveling public , maintaining efficient traffic flow and preserving the integrity of Weld County' s road
right-of-way .
Amend Sec . 8 -13 -30 . Regulation of work in county road right-of-way .
A . Issuance of Right-of-Way Use Permit . A Right-of-Way Use Permit shall be issued only in
compliance with the rules and regulations set forth in this Article . In no event shall
construction within the County road right-of-way be allowed or permitted if it is detrimental
to the public health , welfare and safety .
B . Right-of-Way Use Permit Necessary . A Right-of-Way Use Permit is required for
occupying , constructing , maintaining or excavating facilities within , and for encroaching
upon , any County road right-of-way .
C . No Work Without Right-of-Way Use Permit . No person or entity may occupy , construct ;
perform maintenance or excavate within any County road right-of-way or easement , or
encroach upon any County rights- of-way or easement , without first having obtained a
Right-of-Way Use Permit from the Department of Public Works . In addition , no person or
entity may excavate , construct perform maintenance or occupy the County road
right-of-way beyond the date or dates specified in the permit unless : ( 1 ) the person or
entity requests a written extension before the expiration of the initial permit . and ( 2 ) a new
permit or extension is granted .
Amend Sec . 8 - 13 -40 . Definitions .
For the purpose of this Article , the following terms , phrases , words and their derivations
shall have the meanings given herein :
Permittee means the owner, operator, person and/or entity constructing , excavating or
occupying the County road right-of-way who has obtained a permit pursuant to this Article .
Right-of- Way (ROW) means a portion of land that is dedicated or granted to and accepted
by Weld County for transportation purposes , such as a roadway or highway whether maintained
or no _ maintained by Weld County . The term is used as both singular and plural .
Remainder of definitions — No change .
Amend Sec . 8 - 13 -50 . Right-of-wWay uUse ' ermit application .
Complete Application Required . Applicants shall file a complete application for a
Right-of-Way Use Permit . Based upon the information provided in the application , additional
submittals may be required by the Department of Public Works if sufficient information was not
provided for review of the application . An application shall be considered complete if it is submitted
in the regtiredaccepted form , includes all mandatory information , including all supporting
materials specified by application_ , and ' s accompanied by the applicable fee If an application is
determined to be incomplete , the Department of Public Works shall provide notice to the applicant ,
PAGE 49
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ORD2023- 16
along with an explanation of the application ' s deficiencies . No further processing of the application
shall occur until the deficiencies are corrected in a future resubmittal . An application which is
determined to be incomplete may or may not retain its same processing cycle . The Right-of-Way
Use Permit and Application areis found in Appendix 8- P , the terms and conditions of which are
incorporated into this Article .
Amend Sec . 8 - 13 -60 . Application review, : .fight-of- , Way Use -- Permit issuance , permit
expiration and permit extension .
A . Review Process . The application and other data filed by an applicant for a Right-of-Way
Use Permit shall be reviewed by the Department of Public Works . The application may
also be reviewed by other departments or agencies to verify compliance with any
applicable laws . If the Department of Public Works finds that the work described in an
application for a Right-of-Way Use Permit conforms to the requirements and regulations
set forth in this Article , meets the requirements defined in the
Design Standards and GriteriaWeld County Engineering and Construction Criteria Manual
(Appendix 8-Q ) or other pertinent laws regulations or ordinances , and that all required fees
have been paid , a Right-of-Way Use Permit shall be issued to the applicant . Criteria upon
which the Right-of-Way Use Permit shall be considered include , but are not limited to , the
following :
1 . Safety : Occupation , construction , maintenance or excavating within the County
road right-of-way must not create a safety hazard to the travelling public .
2 . Constructability : All construction or excavation within the County right-of-way must
be able to be performed according to general construction practices .
B . — No change .
C . Permit Limitations . An approved Right-of-Way Use Permit requires the Permittee to meet
certain permit specifications and general engineering standards when working within the
Weld County road right-of-way . The Department of Public Works shall be responsible for
ensuring compliance with such specifications and standards . Reasonable care should be
used to avoid damaging the existing roadway and/or County road right-of-way . The issuing
and granting of the Right-of-Way Use Permit shall not be construed to be a permit for, or
an approval of, any violation of any of the provisions of this Article or of any regulations of
the County .
D . Indemnification . The Permittee , its agents . employees , subcontractors , Contractors and
assigns , hereby agrees to hold Weld County , Colorado , the agencies thereof and their
officers and employees harmless from any and all loss and damage or any claims which
may arise out of, or be connected with , the construction , installation , maintenance ,
alteration , removal or presence of the lines installed and/or constructed herein referred to
or any work or facility connected therewith , within the area covered by this permit ;
excluding any such loss and damage or any claims ( including consequential damages)
which may be caused solely by the negligence of the County , the agencies thereof or its
officers and employees . The Permittee fully understands that all line installation ,
construction : maintenance and relocation will be performed at no expense whatsoever to
PAGE 50
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ORD2023- 16
the County .
E . Permit Expiration . Every approvedissued Right-of-Way Use Permit shall expire if the work
authorized by the permit i-shas not substantially begun within three ( 3 ) months from the
date of the permit issuance or if the construction of work authorized by the permit is
suspended or abandoned for a period of one ( 1 ) year at any time after the work has begun .
Before work can begin or be resumed , tea new permit must be applied for and reissued
by the Weld County Department of Public Works .
F . Permit Extension . Any Permittee with an unexpired Right-of-Way Use Permit may apply ,
in writing , for an extension of the time within which work may begin or be completed under
that permit if the Permittee is unable to begin and complete work within the time required
for good cause , and that the cause is acceptable to the Weld County Department of Public
Works . If Permittee does not apply prior to the Permit expiring , the Permittee shall reapply
for a new Permit . Projects in progress under and expired Permit shall suspend work until
a new permit is issued . There shall be an extension fee assessed to cover administrative
costs .
Amend Sec . 8 -13-70 . County authority .
A Right-of-Way Use Permit is considered to be a license for use of the County road right-
of-way . The Department of Public Works shall have the authority to suspend work, wholly or in
part , because of the failure of the Permittee to properly execute the work in accordance with this
Article . Weld County , notwithstanding the issuance of any permit or construction in Weld County
road right-of-way , reserves the right to make any changes , additions , repairs or required
relocation of any facilities within the dedicated road right-of-way at any time including , but not
limited to , in connection with the relocation , reconstruction , widening and maintaining roads or
road right-of-way , without compensating the owner .
Amend Sec . 8 -13 -80 . Permittee's general responsibilities .
The Permittee is responsible to comply with all of the terms and conditions set forth in this
Article and the Right-of-Way Use Permit found in Appendix 8- P .
Amend Sec . 8 - 13-90 . Inspections .
A . Inspection of work performed within Weld County road right-of-way , pursuant to an
approved Right-of-Way Use Permit , is required . Inspections during the construction period
will be made by the Weld County Department of Public Works to ensure that work is
progressing in compliance with the Permit . If at any time during an inspection it is
determined work is out of compliance with the Permit or there is a safety concern , a stop
work order shall be enforced until compliance has been returned . It shall be the
responsibility of the Permittee to provide safe access to the work site for the Department
and to all others , as authorized by law , for inspection at all reasonable times during the
execution and upon completion of the work . At the time of inspection , the Department may
order the immediate termination of any work which poses a serious threat to the life ,
health , safety or well - being of the public .
PAGE 51
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ORD2023- 16
B . It shall be the responsibility of the Permittee to notify the Department of Public Works when
work is ready for inspection . The Department requires that every request for inspection be
received at least forty-eight (48) hours before such inspection . Such requests may be
made by telephoning , or emailing or faxing the Department . The presence of Department
employees on -site shall not guarantee or qualify the Permittee ' s performance . The
approved permit must be available on -site for review by Department staff. Failure to
comply will result in suspension of the Permit .
C . — No change .
Amend Sec . 8 - 13 - 100 . Administrative fee.
All required fees shall be paid in full at the time of the permit apphca-tionprior to Permit
issuance . The fee schedule for Right-of-Way Use Permits shall be as determined by resolution of
the Board of County Commissioners and shall be shown on the permit . If the applicant objects to
the denial of a permit application by the Weld County Department of Public Works , or objects to
any of the terms or conditions of a permit thereby placed by the Department , the applicant has
the right to appeal the decision to the Board of County Commissioners , in accordance with the
procedures detailed in Section 12 -4- 110 , below .
Amend Sec . 8 - 13 - 110 . Appeal of denial of Right-of-wWay uUse pPermit.
Remainder of section — No change .
Amend Sec . 8 -13 -120 . Failure to comply .
A . — No change .
B . The Permittee shall correct any unsatisfactory work including , but not limited to , defects in
removal , replacement or patching . If the Permittee fails to restore the Weld County road
right- of-way in the manner and to the condition required by the Weld County Department
of Public Works or fails to satisfactorily and timely complete all restorations required by
the Department , the County shall have the right to perform the restorations at the expense
of the Permittee .
C . Weld County reserves the right to require relocation of any facilities within the dedicated
road right-of-way at any time without compensating the owner. If the Contractor or
Permittee does not perform the required relocation within four (4 ) months of notification
from the Weld County Department of Public Works , no new permits will be issued from
the Department of Public Works for the contractor until the relocation has been
accomplished .
Amend Sec . 8 - 13 - 140 . Enforcement.
A . — No change .
B . Criminal Penalties .
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ORD2023- 16
1 . It is unlawful to occupy , construct or excavate within any Weld County road
right-of-way or encroach upon any County right-of-way , unless a Right-of-Way Use
Permit is first issued . Any person , firm or corporation violating any provision of this
Article is guilty of a Class 2 petty offense , which , upon conviction thereof, shall be
punishable by a fine of three hundred dollars ( $300 . 00 ) or by imprisonment in the
County jail for not more than ten ( 10 ) days , or by both such fine and imprisonment ,
for each separate violation . Each day during which such violation continues shall
be deemed a separate offense .
Remainder of section — No change .
ARTICLE XIV - Road Access Policy
Amend Sec . 8 -14- 10 . Intent of road access policy .
This Article XIV is established for the safe and efficient movement of traffic while allowing
reasonable and safe access to properties . It is necessary to protect the public health , safety and
welfare to maintain conventional traffic flow along with unobstructed roadside drainage and to
protect the functional integrity ( safety , mobility , &and capacity) of County roadways . Access
management is an important tool in transportation planning , which identifies the safety , spacing
and location of driveways , median openings , and the interconnectivity of road classifications to
maintain the access and mobility function of collector and arterial roads . This Article XIV shall
apply to all accesses utilizing County rights-of-way within the unincorporated area of Weld County .
Amend Sec . 8 - 14-20 . Purpose and intent.
The purpose of access management is to manage the safety of existing and proposed
accesses adjacent to land uses on County roads to ensure that safety , capacity , and function are
preserved and a reduction in conflict points occurs . This Article XIV describes the minimum
requirements for the design , construction and maintenance of accesses onto Weld County road
rights-of-way and requires the issuance of an access permit prior to construction .
Amend Sec . 8 - 14-30 . Regulation of access onto County roadways .
A . Access to a Single Parcel . Each parcel shall be limited to one ( 1 ) safe access point for
safe ingress and egress , which may be an existing or new shared access , except if allowed
pursuant to Subsection E . , below .
B . Access Permit Required . An access permit shall be required for any of the following :
1 . _Any person eConstructing a new safe access onto a County road right-of-way ,
2 . cReconstructing , paving , altering , relocating , or enlarging an existing access
location , or
eChanging the use or type of traffic of any existing access location , or
PAGE 53
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ORD2023- 16
4 . onto a County right of way , must first be issued an Access Permit by the
Department of Public Works . No such work s-hatl -commence prior to the issuance
of an Access Permitlncreasing the amount of traffic using an existing access
location .
C . Issuance of Access Permit . Access Permits shall be issued only in compliance with the
rules and regulations set forth in this Article XIV . In no event shall an access be allowed ,
or permitted , if it is detrimental to the public health , welfare , and safety . No such work shall
commence prior to the issuance of an Access Permit .
D . Emergency Access Allowed . Police , fire , ambulance and other emergency providers may
have direct access to County roadways , on a case- by-case basis , if no other access is
permitted . If allowed , the emergency access shall be gated and include a Knox box , or
other types of safety improvements .
E . Additional Access . Additional accesses to a parcel may be allowed if the applicant
demonstrates a need for more than one access , they proposed accesses comply with the
spacing criteria for that road . and no other safety concerns exist ( e . g . sight distance
concerns ) . If a new access is requested that does not meet the spacing criteria to a legal
parcel where an existing access already exists , the additional access shall not be
approved unless the denial of the new access would creates undue hardship on the
property owner, as determined by the Department of Public WorksWeld County .
Whenever multiple accesses to a single legal parcel exist , and additional accesses are
requested , one ( 1 ) or more existing accesses must be removed , minimizing new
accesses and utilizing existing accesses .
F . Access Permit a Condition of Building Permit .
1 . When a new or upgraded access locationis to be constructed in conjunction with
theany construction authorized by a building permit , the
issuance of an access permit shall be a condition for obtaining a building permit
for such construction .
2 . When Tthe property owner intends to use a Historical Access Location in
conjunction with any construction authorized by a building permit , the property
owner shall will be asked to apply for a new access permit for any existing access
location never previously permitted . Unless otherwise required by this Article XIV ,
such access permit shall not require the closure , relocation , upgrade , or any other
physical change to the Historical Access Location and shall be for the purpose of
identifying the Historical Access Location . In that circumstance the property
owner shall not be charged an access permit application fee .
G . Chan hen -an existing
as a condition of s is the result of a change of use or
•
•
a condition of the access permit , where app icab e . A change o= use may include , but is
PAGE 54
2023-3498
ORD2023- 16
not limited to , the amount or type of traffic , structural modifications , remodeling , land use
creation of new parcelsDefinitions .
Access means the physical location where vehicles enter onto a maintained County road
right-of-way .
Change in Type of Traffic means a change to the type of vehicles that use the existing
access location , including but not limited to , a change from passenger vehicles to semi -
trucks , or a change from agricultural equipment to passenger vehicles .
Change of Use means a change in how a parcel that accesses onto a County road
right-of-way is used , regardless of whether the parcel is within the unincorporated part of
the County . Change of Use includes the construction of additional principal structures
(e . g . homes , offices , etc. ) , the increase of intensity of an existing use (e . g . expansion of
an existing business , etc . ) , change in zoning , change in lot lines , creation of new parcels ,
and other land use changes . Change of Use does not include construction of accessory
structures , remodeling of existing structures that does not increase traffic to the site , or
similar changes .
Historical Access Location means an unpermitted access that was constructed and in- use
prior to the date that this Access Code was originally approved , July , 1 , 2010 . Unless
there is a safety concern , Historical Access Locations may continue to be used in the
manner they were historically used prior to that date . Any Change of Use , Change in
Type of Traffic , increase in amount of traffic , or change to the physical location of the
Historical Access Location (e . q . enlarging , reconstructing , paving , or otherwise altering)
shall require a new access permit .
Illegal Access means an unpermitted access that has been constructed or used when
otherwise required to obtain an access permit . Illegal Accesses do not include Historical
Access Locations that are used in the manner they were historically used prior to the
original approval of this Access Code .
H . Access Approval as a Condition of a Land Use Case . When an new , existing , or shared
access is to be utilized in conjunction with a land use case , the plat map shall identify the
preliminary approved access location prior to recording the plat . The property owner shall
apply for an access permit when ready to construct the access and may be required to
enter into an improvements and road maintenance agreement . For the r,. irpose of thi
Article XIV , "land use case" may include , but is not limited to , applications seeking
approval for use of a property under the processes listed in Chapter 23 of this Code ,
division of properties , pursuant to the procedures found in Chapter 24 of this Code , or
Planned Unit Development through processes detailed in Chapter 27 of this Code .
I . — No change .
Table 1 — Minimum Access Spacing Criteria ( Feet) - No change .
Add J . Closure/Upgrade/Relocation of Accesses Presenting Safety Concerns . Weld County has
PAGE 55
2023-3498
ORD2023- 16
the authority to order an existing access location (whether permitted , historical , or illegal )
to be closed , upgraded , or relocated whenever it determines that a significant safety
concern exists . Such action shall be made at the property owner' s expense .
Amend Sec . 8 -14-40 . Access permit application process .
A . Submittal Requirements ; Complete Application . An application for an access permit shall
be considered complete if it is submitted on the required form , includes all mandatory
information , including all supporting materials and is accompanied by the applicable fee .
The application must be signed by the property owner or, if applicable , an authorized
agent . Written authorization to act on the property owner' s behalf may be accepted if the
access application is not signed by the property owner. If an application is determined to
be incomplete , the Department of Public WorksPlanning Services shall provide written
n otice to the applicant , along with an explanation of the application ' s deficiencies . No
further processing of the application shall occur until the deficiencies are corrected in a
future resubmitted application . An application which is determined to be incomplete may
o r may not retain its same processing cycle .
B . Subdivision or Common Development Plan Access . Upon approval by its Director. the
Department of Public WorksWeld County may require one ( 1 ) access permit at the location
where the proposed common development plan or subdivision accesses to the County
road to reduce the administrative burden on staff and applicants requesting permits
concurrently for multiple lots . Such "development access" is subject to a development
review application .
C . — No change .
D . Review Process . The application and information provided by an applicant for an access
permit shall be reviewed by the Department of Public WorksWeld County . The application
may also be reviewed by othermultiple departments or agencies to verify compliance with
any applicable laws and codes . If the Department of Public WorksWeld County finds the
information and supporting documentation in the application for an access permit
conforms to the policies and requirements set forth in this Article XIV , meets the
requirements defined in the Weld County Engineering and Construction Criteria , as shown
in Appendix 8-Q , or in other pertinent laws , regulations or ordinances , and that all required
fees have been paid , an access permit shall be issued to the applicant .
E . Changes in Approved Permit . An approved permit shall not be changed , modified or
altered without written authorization from the Department of Public WorksWeld County .
All work shall be done in conformance with the approved permit .
F . Permit Limitations . An approved access permit expires after one ( 1 ) year from its date of
issuance and requires the permit holder to meet the specifications and general
e ngineering standards of the Weld County Engineering and Construction Criteria , as
shown in Appendix 8-Q . The Department of Public Worksproper Weld County staff shall
be responsible for ensuring compliance with such specifications and standards .
PAGE 56
2023-3498
ORD2023- 16
Remainder of section — No change .
Amend Sec . 8 - 14-50 . Permit holder's general responsibilities .
A permit holder is responsible to comply with the general provisions of this Code , including
temporary accesses permits issued for the following items : Additional requirements and more
detailed information are shown in the special provisions of the access permit .
A . — No change .
B . Traffic Control . Access construction activities should not interfere with traffic on County
roadways . If interference with traffic is necessary , a traffic control plan shall be submitted
to , and approved by , the Department of Public Works as part of thea Right-of-Way pPermit
application . All traffic control shall conform to the most current version of the Manual on
Uniform Traffic Control Devices standards , which is available for review on the Federal
Highway Administration website . All regulatory signs require approval of the Board of
County Commissioners . If applicable , the permit holder shall be required to install all
necessary signage and shall bear all expenses for the fabrication and installation of road
name signs , permanent barricades , and signs required as part of a development project
( e . g . , one way , no parking , no outlet , stop sign , speed limit , etc . ) .
C . — No change .
D . Tracking control . Permanent vehicle tracking controls provide stabilized site access where
vehicles exit a location onto a paved road . Vehicles are required to perform a complete
revolution of all tires prior to entering a County- maintained roadway . Effective vehicle
tracking control helps remove sediment ( mud or dirt ) from vehicles . Commercial , industrial
or high traffic volume accesses shall provide permanent tracking control devices , which
include , but are not limited to , double cattle guards or a paved ( asphalt/concrete ) tracking
pad extending three hundred ( 300) feet into the site to mitigate impacts to the paved road ,
including damages and/or offsite tracking of mud or other materials . Requests for
temporary tracking control techniques must be approved by the Department of Public
WorksWeld County prior to installation . Temporary tracking control shall be used during
construction unless permanent tracking control is installed ahead of construction activities ;
such devices include , but are not limited to , crushed natural aggregate ( recycled crushed
concrete or asphalt shall not be used for any vehicle tracking pads ) along with a geotextile
fabric or pre-fabricated vehicle tracking pads with approved dimensions . Use- by- right
permitted agricultural accesses are exempt from tracking control requirements . Tracking
control is required for construction of accesses to prevent tracking from the site onto paved
public roadways . The permit holder may be held financially responsible for damage to the
roadway resulting from inadequate tracking control . All tracking control devices and
designs must be in accordance with the Weld County Engineering and Construction
Criteria , Appendix 8-Q .
E . Access Construction , Restoration and Clean - up . The permit holder is responsible for
installation of the correct culvert size (s) , materials , and the cost of installation for new
access culverts whenever the installation of a culvert is made necessary by the creation
PAGE 57
2023 - 3498
ORD2023- 16
of a new access from private property to a county roadway . Accesses should be
constructed in a manner that minimizes erosion and does not result in disposition of silt
and debris upon the county roadway or roadside ditches . Accesses which slope down
toward the County road will be constructed to assure that water does not run onto or
across the traveled public way . This may include designing the crown , borrow ditches ,
pans , or other elements so that they direct water to the existing drainage facilities along
the road . The permit holder shall assume all responsibility for removing all debris
associated with the access construction activities and restoring the County roadway to
pre-existing conditions . The access permit may allows construction of the access without
the need for obtaining a separate rRight-of-wWay Use pPermit pursuant to this Chapter .
Installation of commercial/industrial access (es) may require a traffic control plan to be
approved with the access permit . the permit holder, upon notification from the
Departments of Public Works and/or Planning Services , shall correct any items not
consistent with the approved access permit within fourteen ( 14 ) days . If the permit holder
fails to restore the road right-of-way in the manner and to the condition required by the
Departments of Public Works , the County may remove the access or perform the
restorations and invoice the permit holder for the expense (s) incurred by the County .
F . Access Sight Distance . Sight distance is essential to protect the traveling public at all
access points along County roadways . Sight distance is the length of roadway that is
clearly visible to the driver and is dependent upon the height of the driver' s eye above the
road surface , the specified object height above the road surface , and the height of sight
obstructions within the line of sight . The minimum sight distance available on a roadway
must be sufficient to enable a vehicle traveling at or near the design speed to stop before
reaching a stationary object . In evaluating the overall performance of a roadway , both the
horizontal and vertical sight distances must be considered . When items such as walls ,
buildings , bridge piers , cut slopes , or vegetation growth are near the roadway on the inside
of a curve , they can block a driver' s view of the road ahead . If they are too close , the driver
will not have sufficient distance along the curved roadway to stop when a hazardous
condition comes into view . The minimum requirements and technical criteria for sight
distance are in the Weld County Engineering and Construction Criteria Manual , Appendix
8-Q .
Amend Sec . 8 - 14-60 . Variance from specific access permit requirements .
A property owner may request a variance from specific requirements set forth in this Article
XIV. The Department of Public WorksWeld County will consider requests for variances on a
case- by-case basis . Requests for variances may be submitted in a written letter to Public
WorksPlanning Services addressing the hardship or justification for the variance and supporting
documentation to explain why they cannot comply with the requirements of this Article or as
outlined in the Weld County Engineering and Construction Criteria , Appendix 8-Q . Requests will
be reviewed and acted upon by the Public WorksPlanning Services Director or designee to ensure
they will adequately protect the public health , safety , and welfare . Public WorksWeld County staff
will respond with an approval or denial in writing within thirty ( 30) days of receipt of the variance
request .
Amend Sec . 8 - 14-70 . Appeal of denial of access permit.
PAGE 58
2023-3498
ORD2023- 16
If an access permit is denied by the Department of Public WorksWeld County staff, or the
applicant objects to any of the terms or conditions of a permit thereby placed by the
DepartmentCounty , the applicant has the right to appeal the decision to the Board of County
Commissioners , in writing , utilizing the appeal procedures set forth in Section 2 -4- 10 of this Code .
Amend Sec . 8 - 14-80 . Enforcement.
A . Violations and Penalties . The County , through the Department of Public WorksPlanning
Services or other departments so authorized , may enforce this Article XIV through
methods included in this Section , or through other methods adopted by the Board of
County Commissioners .
B . Criminal Penalties .
1 . — No change .
2 . Whenever the Department of Public Works and/or Planning Services , through one
( 1 ) of its employees , has personal knowledge of any violation of this Article XIV , it
shall give written notice to the violator to correct such violation within sixty (60)
days after the date of such notice . Should the violator fail to correct the violation
within such sixty (60) day period , the Departments of Public Works and/or Planning
Services may request that the Sheriff' s Office issue a summons and complaint to
the violator, stating the nature of the violation with sufficient particularity to give
notice of said charge to the violator. The summons and complaint shall require that
the violator appear in court at a definite time and place stated therein to answer
and defend the charge . One ( 1 ) copy of said summons and complaint shall be
served upon the violator by the Sheriff s Office in the manner provided by law for
the service of a criminal summons . One ( 1 ) copy each shall be retained by the
Sheriffs Office and Department of Public WorksPlanning Services and one ( 1 )
copy shall be transmitted to the Clerk of the Court . The County may install barriers
across or remove any access not conforming to this Article XIV during the
pendency of the enforcement action .
3 . and 4 . — No change .
C . thru E . — No change .
F . Inspections . The Departments of Public Works and/or Planning Services or other County
departments may conduct an inspection of each access that is the subject of the access
permit to ensure full compliance with all provisions of this Article XIV and the terms of the
permit .
G . — No change .
H . Access Permit Issued Erroneously or Upon Incorrect Information . Any access permit
which has been issued in error or on the basis of incorrect information supplied by the
permit holder, shall be considered void . In the event an access permit is void , no refund
of permit fees shall be made unless the access permit was issued in error by
Department of Public WorksWeld County staff.
PAGE 59
2023-3498
ORD2023- 16
I . Notice Regarding Illegal Access . "+ " i con i ed to be ten „ acres not
permitted . Existing accesses constructed prior to 2010 should obtain an access permit at
no charge . For an illegal access , the property owner shall be sent written notice of any
illegal access location or use . The owner shall be given sixty (60 ) days notification of
pending actions , after which the County may install barriers across , or remove , any access
n ot conforming to this Article XIV. Any access , driveway or curb-cut being constructed
within County road right-of-way without an approved access permit shall be required to
stop work immediately and apply for an access permit . If the permit is approved , work may
continue subject to the conditions of the permit . If the permit is denied , any work that has
been completed must be removed and the road and drainage facilities returned to pre-
existing conditions acceptable to the Department of Public Works and Planning Services ,
u pon completion of any appeal or the time for appeal pursuant to the provisions of Section
8- 14-70 , above .
Amend Sec . 8 -14-90 . County authority .
Notwithstanding the issuance of any access permit or the construction of any access ,
Weld County reserves the right to make any changes , additions , repairs , conditions , and
relocation or closure of any part of an access within the County road right-of-way at any time ,
including , but not limited to , in connection with the relocation , reconstruction , widening and
maintaining of the road or right-of-way , without compensating the owner of the access for the
damages to or destruction of the access .
Amend Sec . 8- 14- 100 . Access Control Plans (ACP's ) , and additional techniques and
requirements for access on County roads .
A . and B . — No change .
C . Access Control Techniques . A reduction in accesses onto a County road will improve
traffic flow , operations , and safety of the traveling public . To reduce the number of existing
access points , applicants may be required to implement the following access control
techniques to reduce conflicts while maintaining adequate access to adjacent land uses .
1 . Elimination . Applicants may be required to eliminate accesses identified as unsafe
locations , where there are more than two ( 2 ) existing accesses for a parcel , or do
not meet spacing requirements identified in the Weld County Engineering and
Construction Criteria documentManual (Appendix 8-Q ) .
C . 2 . thru D . — No change .
E . Auxiliary Turn Lanes . Auxiliary lanes maintain the safety , traffic flow , and operation of a
roadway or access . Auxiliary lanes are required when unique location factors exist such
as roadway speed and traffic density , access volume , the volume of commercial trucks ,
the influence of nearby accesses , existing auxiliary lanes close to the proposed access ,
n earby traffic control devices , available stopping sight distance , and other topographic or
roadway design factors . When applicable , the access permit holder is responsible for
PAGE 60
2023-3498
ORD2023- 16
design , installation , any road right-of-way acquisition needed to accommodate the
required lane width . Required auxiliary turn lanes must be installed according to the
following traffic triggers :
1 . thru 3 . — No change .
4 . A left turn acceleration lane with transition taper may be required if it would benefit
the safety and operation of the roadway . A left turn acceleration lane is generally
not required when the acceleration lane would interfere with the left turn ingress
movements to any other access . Further auxiliary lane design criteria can be found
in the Weld County Engineering and Construction GuidelinesCriteria Manual
(Appendix 8-Q) .
F . Closure or Elimination of access . When an access is closed , abandoned or eliminated the
permit holder shall assume all responsibility for any activities related to the
closure/elimination and reclamation of access points stipulated to be removed . In the
event the issuance of an access permit requires an existing access point to be "closed
and reclaimed " it shall be completed by the stipulated date on the permit . If the county is
closing an access , the property owner will be notified in writing , prior to the closure
occurring of the date the County will close the access . Closure and reclamation activities
may include , but are not limited to , reestablishing the profile of the burrow ditch , removing
any culverts and gates in the fencing adjacent to the maintained road right-of-way , and
attempting to reseed the affected area located in the road right-of-way with natural
vegetation to the satisfaction of the Department of Public Works and Planning Services .
G . Roadway Improvements . Projects with high traffic/trip generation or a crash historysafety
concerns may require public improvements ; including but not limited to , auxiliary lanes ,
such as acceleration and deceleration lanes , exclusive left or right- hand turn lanes , or a
traffic signal , in accordance with the Weld County Engineering and Construction Criteria
Manual , as shown in Appendix 8-Q . If these types of roadway improvements are required ,
the permit holder will be responsible to enter into an improvements agreement with
collateral . The agreement shall be approved by the Board of County Commissioners .
Remainder of section — No change .
ARTICLE XV - Transport Permits
Amend Sec . 8 - 15-40 . General provisions .
A . thru B . 6 . — No change .
B . 7 . Travel routes may require build outs of turning radii or other road improvements
necessary to accommodate movement of the Vehicle/Load . A rRight-of-wWay Use
pPermit may be applicable .
Remainder of section — No change .
Amend Sec . 8 -15-50 . Transport permits types .
PAGE 61
2023-3498
ORD2023- 16
The following Transport Permits are available as determined by the Department of Public
Works for the movement of Extra-legal Vehicles and Loads on roadways under Weld County
jurisdiction :
A . thru E . — No change .
Delete F . Fleet Permit : A permit valid for one ( 1 ) year from the date of issuance for Applicants
with ten ( 10) or more Vehicles of which may not exceed Maximum Limits for Annual
Permits .
Amend Sec . 8 -15-60 . Transport permits application information .
A . The Maximum Limits authorized for Annual Extra -legal Vehicles or Loads are as follows :
1 . — No change .
2 . SixteenSeventeen ( 167 ) feet in Width .
Remainder of section — No change .
Amend Sec . 8 -15-70 . Transport permit application process .
A . — No change .
B . Submittal Requirements . Applicant must submit a complete application form , required
submittals , and fee to the Department for review . Required submittals may include , but
are not limited to :
1 . Route survey and axle configuration drawing .
B . 2 . thru E . — No change .
F . Permit Expiration .
1 . — No change .
2 . Oil Rig Permits expire tenfive ( 105 ) days from the date of issuance .
Remainder of section — No change .
ARTICLE XVI - Vacation of Road Right-of-Way by Board of County Commissioners
Amend Sec . 8 - 16-30 . Vacations of public road rights -of-way not within historic townsites
or subdivisions .
A . Complete petitions for vacation of public road rights-of-way not within historic townsites or
subdivisions accepted by the Department of Public Works shall include :
1 . A complete Petition Application signed by the petitioner with an accurate legal
PAGE 62
2023-3498
ORD2023- 16
description of the road right-of-way requested to be vacated .
2 . and 3 . — No change .
4 . A list of all adjacent property owners within 500 feet or landowners who are not
directly adjacent , but may be affected due to usage of the road right-of-way .
A . 5 . thru B . — No change .
C . Within six ( 6 ) weeks of the petition being received , and at least ten ( 10 ) days prior to the
meeting at which the Board of County Commissioners is to consider vacating any public
road right-of-way , the Clerk to the Board shall mail notice of the meeting to all persons
owning land adjacent to the roadway to be vacated , including any landowner who the
Department of Public Works reasonably determines may use the road right-of-way
proposed to be vacated to access their property . This notice shall not be required if the
public road right-of-way has not been used as a roadway for at least twenty-one ( 21 ) years
or since it was established . Inadvertent errors by the Department of Public Works in
determining who should receive such notice , or by the Clerk to the Board ' s Office in
sending such notice , shall not create a jurisdictional defect in the process , even if such
error results in the failure of a property owner to receive such notification .
Remainder of section — No change .
Amend Sec . 8 -16-40 . Requirements .
A . — No change .
B . The Board of County Commissioners may approve or deny any request to vacate public
road right-of-way as it determines to be in the best interests of the County . The Board may
consider any information or evidence it determines appropriate , including , but not limited
to , the following , to be provided by the Department of Public Works :
1 . — No change .
2 . Whether the road right-of-way is a maintained or non - maintained public road , and
3 . — No change .
4 . Whether there is enough information to determine if the public needs this road
right-of-way in the future for items such as utility easements . etc . A title
commitment or land survey plat may be required .
Remainder of section — No change .
Appendix 8-A Reserved — NO CHANGE .
Appendix 8- B Road Access Sketches — ATTACHED .
Appendix 8-C Cattle Guards — ATTACHED .
Appendix 8- D Dust Controls and Seasonal Adjustment Factor — ATTACHED .
PAGE 63
2023- 3498
ORD2023 - 16
Appendix 8-E Weld County MS4 Area—ATTACHED
Appendices 8-F—8-J Reserved—NO CHANGE
Appendix 8-K 1-25 Corridor Plan—ATTACHED
Appendix 8-L Roadside Memorial Sign Application—NO CHANGE
Appendix 8-M Memorial Signs—NO CHANGE
Appendix 8-N Transportation Plan—NO CHANGE
Appendix 8-O Functional Classification Map—NO CHANGE
Appendix 8-P Right-of-Way Use Permit—ATTACHED
Appendix 8-Q Weld County Engineering and Construction Criteria—ATTACHED
BE IT FURTHER ORDAINED by the Board that the Clerk to the Board be,and hereby is,
directed to arrange for Municode to supplement the Weld County Code with the amendments
contained herein,to coincide with chapters,articles,divisions,sections,and subsections as they
currently exist within said Code,and to resolve any inconsistencies regarding capitalization,
grammar,and numbering or placement of chapters,articles,divisions,sections,and subsections
in said Code
BE IT FURTHER ORDAINED by the Board, if any section, subsection, paragraph,
sentence, clause, or phrase of this Ordinance is for any reason held or decided to be
unconstitutional,such decision shall not affect the validity of the remaining portions hereof The
Board of County Commissioners hereby declares that it would have enacted this Ordinance in
each and every section,subsection,paragraph,sentence,clause,and phrase thereof irrespective
of the fact that any one or more sections,subsections, paragraphs,sentences, clauses, or
phrases might be declared to be unconstitutional or invalid
The above and foregoing Ordinance Number 2023-16 was,on motion duly made and
seconded,adopted by the following vote on the 8th day of January,A D,2024
BOARD OF COUNTY COMMISSIONERS
WELD COUNTY,COLORADO
ATTEST
Mike Freeman,Chair
Weld County Clerk to the Board
Perry L Buck,Pro-Tem
BY
Deputy Clerk to the Board
Scott K James
APPROVED AS TO FORM
Kevin D Ross
County Attorney
Lori Same
Date of signature
First Reading December 4,2023
PAGE 64
2023-3498
ORD2023-16
Publication December 10,2023,in the Greeley Tribune
Second Reading December 20,2023
Publication December 24,2023,in the Greeley Tribune
Final Reading January 8,2024
Publication January 14,2024,in the Greeley Tribune
Effective January 19,2024
PAGE 65
2023-3498
ORD2023-16
CHAPTER 8 - Public Works
APPENDIX 8 - B ROAD ACCESS SKETCHES
DELETE APPENDIX 8- B IN ITS ENTIRETY - RESERVED
ROAD ACCESS
SKETCH #1
i
AGGREGATE BASE COURSE COUNTY
s2' cppvte oR p ROAD PAVEMENT SHOULDER
MANUTACTURRR RCOWMENDATIONS.
OW LINE
DOWN GRADIENT SLOPE FOR A
MINIMUM OP 10'
sal
�_ j 29 4iiiiiiiS
♦ ♦ ♦ ♦ ♦ 1 ♦ ♦ ♦ ♦ ♦ 1 ♦ ♦ ♦ %* iWt/ ♦ \ 1 � ♦ ♦ ♦ ♦ � ♦ \ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ �♦ ♦ ♦ ♦ ♦l♦l♦/ v
Nee4%te/kik.. .G:/i.D:G:/)Me /i.ee,..?,/i aeet./�:G./i 4.4.4./.G.G.4.✓i.✓i,✓A/1.4.4.0.✓i 40 G.//.aae,:4.G./.A.4.44.4.-.4.444.4.44,4
NOTE: MIN. PIPE DIAMETER IS 15" . CROSS -SECTION
LARGER SIZES MAY BE NEEDED
TO MEET DRAINAGE REQUIREMENTS. A — A •
s....*_____D+ 24" MIN. _ice
8"
jer/
ii /
it YIN.
----E
1-- A i
COMMERCIAL 5" MIN.
l ACCESS -1---
ROAD
CONCRETE HEADWALL
NOTE: LIGHT COMMERCIAL I 24' I PRECAST OR CAST IN PLACE
20' RADIUS I _ _ - __ ion)
40 L.F. OF 15" DU. CULVERT OR AS REQUIRED. I
,agiLev\ CONCRETE HEADWALL
FLOW LINE
40' RADIUSN I GRAVEL OR PAVED
SURFACE SHOULDER
AS REQUIRED.
PAVEMENT
m
- - - ___
WELD COUNTY ROAD � - - --- - - - - - - -- — - - - -- - - 'b
PLAN VIEW
I A NOTE: ADDmONAL EIDVUNG OP COUNTY ROAD
TURNING LANES MAY at REQUIRED.
Weld County, Colorado, Charter and County Code Created : 2023- 11 -07 14 : 42 : 52 [ EST]
(Supp . No . 85 )
Page 1 of 43
CHAPTER 8 - Public Works
APPENDIX 8-B ROAD ACCESS SKETCHES
ROAD ACCESS
SKETCH #2
AGGREGATE BASE COURSE
it Nadi& RIR Rlcomi aNDA?Wot+s. ROAD J PAVEMENT SHOULDER
DOWN GRAINY S,OrE FOR A / LOW LINE
wNwUM OF It
��� _ ; = , ✓ ♦.����♦�����0����♦��*.e*���G♦O♦���������♦������♦����♦��♦ ♦♦��♦\VSV''.4.." .S•e*����,��������`W\N.♦�W`� �s,N�i,♦ei,�Q♦��,♦G,♦�i♦��
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09111•151.00*- .0"♦%i.:ii%.**de/ittaalb/i���l�i�. fra .4:4ii��,..> !i�♦*Ni�♦i,/iN�G /)".../iistec4O1%.4a./ANtike#:: ii��isIVA:Nobacca.>4.40br �atedi`a4\4lit:0,4i0✓i� �✓iNIi�♦iii✓�%
NOTE: 15" CMP. MIN CROSS-SECTION
A - A
A
PRIVATE PROPERTY •
ACCESS
10' MIN. - 12' MAX.
- -�- - - -_- i - - - - LINE
20' RADIUS GRAVEL OR PAVED
SURFACE
AS REQUIRED. SHOULDER
PAVEMENT
WELD COUNTY ROAD
STORM WATER DRAINAGE FLAW LINE
-
PLAN VIEW
t--- A
Weld County, Colorado, Charter and County Code Created : 2023- 11 -07 14 : 42 : 52 [ EST ]
(Supp. No. 85)
Page 2 of 43
CHAPTER 8 - Public Works
APPENDIX 8-B ROAD ACCESS SKETCHES
ROAD ACCESS
SKETCH #3
AGGREGATE BASE COURSE
ROAD COVER OR PER ROAD IJ�` PAVEMENT SHOULDER
MANUFACTURER RECOMMENDATIONS.
DOWN GRADIENT SWF'S FOR A LOW LINE
re-menitu
M OF t0' ,
2R 2% C
ACCESS ROAD y •
• � • • ii~�ii�4/,
CROSS-SECTION
NOTE: 15" CUP. MIN A - A
A
I2" COVER MIN.
r--- A
PRIVATE PROPERTY
OR SUBDIVISION
ACCESS
•
24' OR AS REQUIRED
awl
20 RADIUS GRAVEL OR PAVED
SURFACE
AS REQUIRED. SHOULDER
PAVEMENT
WELD COUNTY ROAD
•
STORM WATER DRAINAGE FL011 LINE
PLAN VIEW
- A
NOTE: ADDITIONAL WIDENING OF COUNTY ROAD
TURNING LANES MAY BE REQUIRED.
Weld County, Colorado, Charter and County Code Created : 2023- 11 -07 14 :42 : 52 [ EST]
(Supp. No. 85)
Page 3 of 43
CHAPTER 8 - Public Works
APPENDIX 8- B ROAD ACCESS SKETCHES
ROAD ACCESS
SKETCH #4
AGGREGATE BASE COURSE
I2' COVER OR PER \ ROAD PAVEMENT
_ SHOULDER
MANUFACTURER RECOMMENDATIONS FLOW LINE
DOWN GRADIENT SLOPE FOR A
MINIMUM OF ICY / 27.
AA\
4/,‘ \ < /c\-// / _/;.\$\/\/< /c<st \ ts>„).„,,,,,.>
NOTE: 15" CMP. MIN CROSS-SECTION
A - A
A
PRIVATE PROPERTY
I ACCRSS
l
10' MIN - 12' MAX.
' --- --
S
FI.AR- LTNR
GRAVEL OR PAVED
20' RADIUS SURFACE
AS REQUIRED SHOULDER
PAVEMENT
WELD COUNTY ROAD
•
— — - -- - - - - - -3N11 Anna — - - - - — - - — - -
PLAN VIEW
A
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 52 [ EST ]
( Supp . No . 85 )
Page 4 of 43
CHAPTER 8 - Public Works
APPENDIX 8-C CATTLE GUARDS
AMEND APPENDIX 8- C CATTLE GUARDS
Date : No.
Weld County Department of Public Works P . O . Box 758 Greeley, CO 80632 ( 970) 356 4000 EXT. 3750
WE _D COUNTY CA- TLr GUARD AGREE M \WT
•
described as follows :
Address or location of access :
Weld County Road No. Side of Road N , S, E or W
Condition of existing guard : Good Fair Poor
Is there an existing cattle guard and access to the property? Yes No
Condition of existing guard : Good Fair Poor
is approved subject to the following conditions, restrictions and agreements :
That you resto • it of way anc roacway to tieir origina conditions,
backfilling to be well tamped and packed, and the last 12 inches of backfill-on crossin
material , such as crushed rock or gravel , and all dirt and debris to be removed from all the rights of way when
wor< is comp eteo-; tiat a roacway signs ta <en cow-n be rep acec immediate y, anc tiat you check and maintain
backfill after all storms and assume full responsibility for any damage it may cause .
•
completed wit uin a reasonab e time after construction is startec ; tiat you wi protect tie trave ing public curing
s and signals, i .e. , flares, both day and night; that you assume full
s resulting from this installation; y changes are made in these
lig -ways in tie future tiat wou c necessitate the removal or relocation ,
re ocate at your own expense upon written request from We d County .
•
That you save anc -io t We c County iarm ess from any anc a c-aims of a
sts, if any are incurrec , in tie ccfense
of any c aims mace by any person, firm or corporation by reason of tie instal ation of said cattle guard anc the
maintenance thereof,
Weld County is -not responsible for any damages caused by the maintenance of the county roads due to
installations placed inside the county right of way .
Live agents, heirs, executors, administrators,
successors and assigns .
Name
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 52 [ EST ]
( Supp . No . 85 )
Page 5 of 43
CHAPTER 8 - Public Works
APPENDIX 8-C CATTLE GUARDS
Wi . •1. •�r i«.,d ;-..... *'�
- 1.41/4 "s -- r
"s-.N \ 1861 PUBLIC WORKS DEPARTMENT
<�.
EI1111 H STREET, P . O . BOX 758
LIZT
GREELEY, COLORADO 80632
I? !
::irid .V WEBSITE : WWW . CO . WELD . CO . US
{,I? ' � . __G,.O v >1PHONE : ( 970 ) 304-6496
• I : v FAX : ' 970 ) 304- 6497
CATTLE GUARD INSTALLATION/ RELOCATION
REIMBURSEMENT AGREEMENT
Date :
By signing this document, you have agreed to reimburse Weld County Public Works for materials
to install a 16 ', 24' , or 32' wide Cattle Guard . The Cattle Guard location is on CR between
CR/ Hwy and CR/ Hwy at tenths of a mile N , S, E, or W of CR/ Hwy .
Cattle Guard design shall be in accordance with Weld County specifications and details .
Installation will be done by a Weld County Public Works crew at the agreed location .
Payment is required prior to installation .
A price breakdown : Cattle Guard width Foot : Total $
Landowner( s ) :
( please print) ( signature '
( please print ) ( signature
Landowner Address :
Landowner Phone :
Weld County Representative Title
* * Sign one copy and send the signed copy with payment to Weld County Public Works at P.O. Box 758, Greeley,
Colorado, 80632
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 52 [ EST ]
( Supp . No . 85 )
Page 6 of 43
CHAPTER 8-Public Works
APPENDIX 8-C CATTLE GUARDS
CATTLE GUARDS#1
�Q
LLa "w
::' :1 -"
U d y m 4
g a
~21t. io D
w 7y(
N N
m
" !tI
N a 1 ._
ak
w \ N
0
0�
N Q e e e
SC~.J �—, e e
K
Z (V
Q 0
�U
CV {p
o Q z
O a J CV
.0
U m N ptncJM 4
I
m 3I
fV tP
+ -,.— —
I
m
Weld County,Colorado,Charter and County Code Created 2023-11-07 14 42 52[EST]
(Supp No 85)
Page 7 of 43
CHAPTER 8-Public Works
APPENDIX 8-C CATTLE GUARDS
CATTLE GUARDS#1(cont'd)
CONCRETE BASES
CROSSBAR
ANCHOR qN0 . -`
CLIP 1/4,2.STRAP
CONNECTING PLATES
OW Ba 17 STRINGER
C103,20.7 CIOa 20T
THREE 13/16 OIA HOLES
CHANNEL IN EACH ENO OF BEAM
2 I/2'
21/2 5
2 (y u I CHANNEL LENGTH 9-4
141J 5 51
rr I 1'
6 3/8.
8-O 8-Oj
,�.•3/8 5-1 7/8 2-3 3/4 3-
I r LIFTING HOOK I TYP fCOUNTERSUNK I
.._ 3/4 ANCHOR BOLTS TYPICAL
3f 311I�
TYPICAL FOR BASE A a C BASE B
ALL CONNECTIONS
NOTE OPPOSITE 117.°C
ANG BOLTING PATTERN FOR
SECTION A 8 C RESPECTIVELY
Weld County,Colorado,Charter and County Code Created 2823-11-87 14 42 52[EST]
(Supp No 85)
Page 8 of 43
CHAPTER 8-Public Works
APPENDIX 8-C CATTLE GUARDS
CATTLE GUARDS#2
'A V4 a 2 STRAP CONCRETE BASE
li w 1 1 5 CROSSBAR
i17,477,77
I 1 1 1 1 MM. C1O:2O 7 CHANNEL
11�- 1 1_ 1 11 1 I
� r f 1 I
1 1 1 11 1 I -p,
� II W 8 a 17 STRINGER
IMEMIM ME=
A 24-.i
PLAN VIEW
9-4.
T-I0" gT-9 I 2"CL7L1/2C-C rf CROSSBARn CONERETE BASE
f"�-iti7 L1 u L1 L-.1 fS L] S LA fi t� No 4 BARS WITH8 STRINGER W 8 a IT-, mI 4 1/2-b'r}a 2"COVERarr.
NI 4 A NO 4 Rips
AT
tI 18-CC WITH
d�'� max`* 'A• 1 2"COVER
, I-6" I 6-4 I_ I-6 a
111��� SECTION A-A ii
2"
MIN THICHNESs
7 GeGE
' ____
v4" ,v2 ,.o
3" CATTLE GUARD
DESIGNED DON CARROLL
CROSSBAR DETAIL CHECKED DREW SCHELTING
APRWED WAYNE SMYTH
WELD COUNTY ENG INEERIN(
DATE MARCH 31,1987
Weld County,Colorado,Charter and County Code Created 2023-11-07 14 42 52[EST]
(Supp No 85)
Page 9 of 43
CHAPTER 8-Public Works
APPENDIX 8-C CATTLE GUARDS
CATTLE GUARDS#2(cont'd)
tiw Z
M � U
\ y as
N
O �
■
x p
w
Y N N ■
v
�O ,
■
-iw :■ l ��
wp
m J,
_
.r
WOE 1J
J�J a
2W
tiN p W
m p
1\CIN
Weld County,Colorado,Charter and County Code Created 2e23-11-e7 14 42 52[EST]
(Supp No 85)
Page 10 of 43
CHAPTER 8-Public Works
APPENDIX 8-C CATTLE GUARDS
CATTLE GUARDS#3
6'
TYPICAL WHERE 1
CROSSBAR CROSSBAR ORSRAPS 316 3 i/q"■2 STRAP
L J OR STRINGERS CONTACT
"m =� m �W6a17
� � STRINGER
-9LCN
r--r-I-1 r-� r-��� r--� C5��I r� r-1 2 5J6
2 5J6 Fs-'—W
2, 2, 2• 2 2 I 2
12 0 c7'9 12-0
4� PLO f"
CENTER
STRINGER SPACING DETAIL
SUPER-STRUCTURE
GENERAL NOTES
SUPER STRUCTURE TO BE SUPPLIED IN TWO SEPERATE 12-0.BY 7'9.UNITS ALL CONCRETE REINFORCING
BARS TO BE CONTINUOUS NO SPLICING OR LAPPING IS ALLOWED
ALL BOLTED CONNECTIONS ARE TO BE DOUBLE NUTTED ALL ANCHOR BOLTS,NUTS,WASHERS AND
CLIPS ARE TO BE GALVANIZED
MATERIALS SHALL MEET THE STATE DEPARTMENT OF HIGHWAYS,DIVISION OF HIGHWAYS,STATE OF COLORADO,
STANDAND SPECIFICATIONS FOR ROAD AND BRIDGE CONSTRUCTION,1991 OF THE FOLLOWING SECTIONS
SEC 509 03 STRUCTURAL CARBON STEEL (ASTM A361
SEC 601 02 CONCRETE (CLASS Al
SEC 709 01 REINFORCING STEEL (GRADE 40)
Weld County,Colorado,Charter and County Code Created 2023-11-e7 14 42 52[ESTI
(Supp No 85)
Page 11 of 43
CHAPTER 8-Public Works
APPENDIX 8-C CATTLE GUARDS
CATTLE GUARDS#4
II w Bxlz
11
II I 1 DOUBLE NUT7ED
11 I I ANCHOR CLI P
II I DOUBLE WISHER
�
_ �' �— I
W B. STRINGER
0 0
34/.4
/4'¢ANCHOR BOLTS WITH 4 1/2�
4'OF THREAD TYPICAL AT c^
ALL CONNECTIONS
ANCHOR DETAIL
a V2'
3/8"P LATE—1 13/16-DIA '
HOLE MD—
ANCHOR CLIP DETAIL
13/16'TA
4 HOLES
3/8 PLATE 1y O O O O
I I
2' ' 3" 3.. I 2' J
Weld County,Colorado,Charter and County Code Created 2023-11-07 14 42 52[EST]
(Supp No 85)
Page 12 of 43
CHAPTER 8 - Public Works
APPENDIX 8 - D DUST CONTROLS AND SEASONAL ADJUSTMENT FACTOR
DELETE APPENDIX 8- D IN ITS ENTIRETY - RESERVED
The following dust-control agents are appr is Health and Environment and
the Department of Public Works :
1 . Potable water or natural ground water
2 . Magnesium chloride
3 . Calcium chloride
Tie seasona acjustment factor to be uses in a traffic count is tie fo -ew4ng4
Seasonal Adjustment Factor
Annual Average Daily Traffic
Month Week No. Factor
January 1
L2
,41
February
March
11
12
13
44
15
16
17
18
-May 19
8
21
- 22 0. 9
June 74
y 0 .8
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 53 [ EST ]
(Supp . No . 85 )
Page 13 of 43
CHAPTER 8 - Public Works
APPENDIX 8 - D DUST CONTROLS AND SEASONAL ADJUSTMENT FACTOR
3C
3
August 32
33
34
35
September 37
38
39
40
October 41
-42
43
44
-N-o 45
46
-47 474
48
49
December 50
51
52
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 53 [ EST]
( Supp . No . 85 )
Page 14 of 43
CHAPTER 8 - Public Works
APPENDIX 8 - E Weld County MS4 Area
DELETE APPENDIX 8- E IN ITS ENTIRETY - RESERVED
TIMNATH u a ., v
SEVERANCE
9�♦�i•♦
eCra CE)
y:WlN th Par -
.0 . .
....,i,„,. !..♦: ti% •
*i-ihrevC F2EFLtweis a t �tv ♦ -
- - I• ♦ ♦ ♦ 0 . "5► 1
45
� t Vii. KERSEY
♦� tfi..♦♦t • "if 4r-
.4.
•
. r Ilrap pp ...
te- Mr 40
. .t6 4.::. trildball
Net_
VA'SALLF
T .
I
J • HNST •WN
I ri
p -
7 a .
ES 506 fan0
0
(11 I • I [—. .d Ma= iii
GILCREST in c
- 5
' II PLATTEVILL • 1 j
Legend
• 1) ----d..., VI•!•A Urbanized Area ( 2010 Census )
i - ,66
Weld County MS4 Permit 4-1-41-14- Incorporated Municipalities
n r�• . � yj— _ ' I CDOT Right of Way
#sater t \
s.119 •► �r r FI - EST • NE 1 State R Federal I ands
LNGM • NT �� cirn (----(---- (-___S Weld County Boundary J
•
LJ FREDERICK
r� 1,25cirli I I HUDSON
KEEN�ES : U -
i-T . -
T S •'i • q - i FORT paps 1. 5271f
J
I! • • C • N • Is 1 iftgi♦ r
=�♦. �� _ 11 _
- IE 1 midi
4♦♦� / f
♦ice • I
♦♦`+♦+♦♦♦♦ = NORTHGLENN •THORNTON 1 _ ___ ____EL -
( Weld County Code Ordinance 2019 05 )
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 53 [ EST ]
( Supp . No . 85 )
Page 15 of 43
CHAPTER 8 - Public Works
APPENDIX 8- K
DELETE APPENDIX 8- K IN ITS ENTIRETY - RESERVED
APPENDIX 8-K_.
IN) 0P-]esfeHhi'iN) ceo L,- 0 , -)1
A- 170
. . . , .
. . •
. . . „ . . . .
_ . . . . .. .
, n,„, , _ , . •
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"0R ?k . • 1 iX ♦ � . � nr T S 3 y i ♦ !
` � .`~i s. ♦.d.fe. _ t ,':. iii' V ♦ , a. 1 a; • %. 9t,,,,- .', , :cgs `,^ }it' -
.. Y� f Siy�..�...snag 1 4 � • ;! ..�.'. ,:sit t ,�a , ti.. •. • 0..-t...7., -. tip•1�;� � .J . ., y .r. ♦..1-•
•
.4':.14.e. ..t 3-144 �. q II el
•.fit.~ It-N-4
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44 2M. .w. ii'-..'- .P v.. '- 1 �� } •7 ) u ..�a • �•S' ;. l 1 • •r ,.4 :4..--,c->7'-ii-
,
-t•_ x. yr a ` f� ,�.. fi. . t :c : .
� "'� � -', i" j !y r- •'. . i s• kie
,,,�lyy �t jY :•�� - l�'-•'V'!Y•:aP.. � ,�1� . 4 .C . ..• '� �+1 i 3. •a .•.t7 3414,.. .gar*
late � •T! Fat, •A YE' y�� - r ,T'.1,aiy.ril'r'. t"..- ;.• . 1. <;).
-. •• '-. .. ,. , _.S h-a. L rya. : .)r.): 'qe• • I 't C` -'.., is i - it _ • r ...
"' f n•• , 1..,. . ..-'4'
-'4' - -
v :i . IleI .� ti l♦ . � - . ).1 �.� ., ya k•• f,
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71,.. 47,-.$ .
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ODD �..� T . �,
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n- -�auasr-.air_• -
i • a
121C11O1\JA. � OfNe'll\l'iLjIN) ITIe
May 2001
VI . TRANSPORTATION ELEMENT
SUMMARY
ront Range, particularly alo /
important element of the 125 Regional Corridor Plan . The purpose of th-is element is to i n-tify now much growth
•
To that end, anticipated development i-n each of the- various communities a-long the corridor was determined and a
public open houses and meetings with individual pcopecty owners / umerous transportation
/
Concept Plan .
/
FS ) evaluated future travel demand
rail system . The system would be located along the
125 Corridor from Denver to Loveland , with an eventual continuation to downtown Fort Collins and a connection
Weld County, Colorado, Charter and County Code Created : 2023 - 11 - 07 14 : 42 : 54 [ EST ]
( Supp . No . 85 )
Page 16 of 43
CHAPTER 8 - Public Works
APPENDIX 8 - K
from 125 to the City of Greeley . The TAFS study also recommended regional and feeder bus service to provide
connections to the commuter rail line.
oposed TAFS
Widening 125 to six lanes was eva uated as one alternative and it was determined tiat the projecteo growth a ong
•
ight lane 1 25 a
tie a-na ysis founc tiat tie accitional four freeway lanes mig it accommodate future traffic, tie arteria s and
interchanges which serve as access to the freeway were impacted even more so with the eight lane freeway . This
•
Corricor, bot i regiona anc oca , to 125—compouncing congestion, anc, 2 ) Tie ac< of increases capacity at
educed their performance,
despite an improvement in I 25 ' s performance. The 125 widening alternatives were also problematic in that the
ability to both widen the freeway and implement the TAFS recommendation for commuter rail was not possible
within the 125 right of way .
As a result of analysis, input from the technical team, policy committee, and public, it was determined that the
Tonal carrying capacity of 125
ructure. Thy
des and through
the addition of local north south roadways to serve local traffic .
The transportation concept plan recommended for the Corridor embraces the findings of the North Front Range
Transportation Alternatives F asibi ity Stucy for commuter rai . Tie transportation cone • of the
transit, bicyc e connections, anc pec estrian orientec activity
centers as essentia first steps towa-rc adcressing tie emerging congestion anc mobi ity issues of the Corricor .
•
•
and the 125 Corridor.
The following discussion describes the process and analysis that led to the proposed recommendations .
TRANSPORTATION PLANNING PROCESS
n Alternatives Feasibility Study (TAFS) evaluated
een Denver and Fort Collins . The study
• of a commuter rail system and regional
and feeder bus service to provide connections to the commuter rail line. These recommendations have been
incorporated into the 125 Regional Corridor Transportation Plan and serve as a foundational element of the overall
exam . .
mope examines anc
Fort Collins, Loveland, and Greeley; the towns of Windsor, Berthoud, and Jokrnstown ; and portions of Latimer and
Weld counties .
The I-25 Regional Corridor Transportation Plan also incorporates transportati
study area . Each community was contacted and their respective current Transportation Plan was included . The
Lion planning efforts,
such as the Crossroads Subarea Transportation Study .
=wu i V _ _O, M \ - W T -t 25 CORK DOR
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
( Supp . No . 85 )
Page 17 of 43
CHAPTER 8 - Public Works
APPENDIX 8-K
As Colorado, the North Front Range, and the 125 Corridor grow, demands for a wide range of transportation
, re, transit, bicycle facilities, and pedestrian improvements .
To help evaluate-the effects of growth on existing and planned infrastructure, current and future development is
, ' bs for the purposes of transportation
,
schools, and recreation . Retail and non retail jobs are indicators of economic development, and have the potential
uppers .
As can be seen on the exhibit at Figure 3 , in 1998 there were approximately 17, 300 dwelling units, 4, 500 retail jobs
and 23, 500} non retail jobs within the two mile wide -I 25 Corridor between Fort Collins and Berthoud . This exhibit
34 west of
Luna tines* Malt 1*****041,4.* MI Si/XV Pisani is nnil
4100 •.__ i 1. ISA tomt t+ i ti • i 74i X1 *as tei would
use p►4ied>it� $1•f! �r►ei:.E�,.4.'4w t!!' 'till
a M�wys ses 16
.111,34
FAT. �f . . %•
I•r — .,;:a.... •
•�'` . . -• 4::,...,r.„:
, „ , "e 'N.« S `i. a - + -fl e
.l►► �'?r�j = t
ioy �F� o . i r• . O j i�.
leaparmins- slreXt * ris:i : : tin:: * #:'is:i is ,
1-473: . I .iii 1
ir.„,,h, , ... ...iti , 1 •14,7•_cr • • .,•_ ioec T.:: % .; .. _1
t- • ... ' .• . • . ;$41 ) Zs.. 1 ). 1 n: s tf
if{ } i � si ' - r'' I .
� . 1
p. •t• ; ;- 40 _ • ..,..rs, i ii . 7 144*-1 ' * 0
.tta • a+w r I • •4 i
i 14' Rrtiirt .r► '
4 . ;
5.1
.11.91070:, .g .
4�' ' r. . �1*• i'1;fit r
`+ r i l!I i r . . 1
f'r .'::•1414 • , `�i.Ic..,. 1 , -..' �eds1 t;.�w. •� • '
a ' ''�f1..,.4:al 1.44;1 ,4.'� ! I E I I _ 0 a �.
I • I R .
1_ a '�. a 2'.Ala_ • a,
r + - d r as + f. t a fr • .*
„,
..... ....,
Ir.
• - se 7. 1, de . .....m . k .m• 1„• • r• is -
` w • . 4 •• � ` eta ti t�%issii lit frm-
1E*; :R - 4-
yYy 1 '
, _ . . .4.7.7.4...!
si,:m i vie .,..•.L.. • (stint.
1.0. .1.',4; ,.2.: .L T'•.fi '.-..... . :
r
l 1 > �` {�
ft
- .i •t' • i —1 ‘ s i _ 4.. 10
�.
I
,
ity for the next 20 to 25 years .
rth Front Range Transportation and Air
ization ( MPO ) . Estimates for the
be seen, dwelling units within the
, • rowth along the Corridor was also expected
for retail jobs, which were estimated to increase from 4, 500 to 13 , 000, or 188 percent, and nonretail jobs, which
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
(Supp. No . 85)
Page 18 of 43
CHAPTER 8 - Public Works
APPENDIX 8- K
were estimated to incr ose from 23, 500 to 51, 100, or 117 percent . In review of the 2020 projections, the majority
of tie increases occur wit i intensification in Fort Co ins anc Love anc wit i a mocest growti anticipatec a ong tie
US 34 east of 125 . It is important to note that as recent y as 1998, itt e growt e zast of 125 in Windsor,
Berthoud, and Johnstown .
As part of the i 25 Corridor Plan process, current development proposals and approved development plans were
collected in the summer of 2000 . In the Loveland area , recently updated 2020 projections were used . In the
remainder of the Corridor, adopted land use plans and current zoning were used to estimate long term development
potential along the Corridor . Althe ,
the projected increase over the previous 2020 estimates is significant . Dwelling units are currently anticipated to
/
by 355 percent, from 4, 500 to 2O, 500. Nonretail jobs arc anticipated to increase from 23 , 500 to 95, 600, for a total
increase of 307 percent .
It is important to note that these estimates, shown on Figure 3 as "Anticipated Projection, " do not represent official
projections as adopted by the MPO . However, it was determined that these estimates of anticipated development
the 2020 projections completed in 1998 .
This information confi-rms that signifi-ca-nt growth is anticipated i-n the 125 Corridor . The number of anticipated
dwelling units and jobs within the Corridor a-re changing continually, with numerous new developments being
f anticipated development within the 1 25 Corridor
will significantly impact traffic flow and congestion along the 125 Corridor. This impact is magnified by the fact that
few roadway improvements are planned in the 125 Corridor, as discussed in the next section .
NOfl ;-- ?orc RANGE REG OVAL -RAN S)O41-As OIL ?LAN 111 •)WVEVE1CS
The MPO develops and administers a Transportation Plan for the North Front Range, which includes the 125
Corridor. A summary of the improvements proposed by the North Front Range 2020 Regiona Transportation P- an
for the 1 25 Corridor is as follows :
• Rail stops in Johnstown and Loveland
• Increased feeder bus service
• Prospect Road : Widen to four lanes west of 125
Timberline Road : Widen to six lanes from V-ine to Harmony and four lanes south of Harmony
Vine Drive : `Auden to 4 lanes west of 125
• SH 402 : Widen to 4 lanes west of 125
US 34 : Widen to 6 lanes west of 125
• CR 7/Rocky Mountain Avenue : Construction of 4 lanes
In reviewing these planned im-p-rovements to the 125 Corri-dor, there are several factors to be considered . First, there
•
•
Weld County, Colorado, Charter and County Code Created : 2023 - 11 - 07 14 : 42 : 54 [ EST ]
(Supp . No . 85 )
Page 19 of 43
CHAPTER 8 - Public Works
APPENDIX 8-K
Third, there are no north south proposed alternatives to 125, other than the proposed future commuter rail, which
will primarily serve long distance home to work trips . Virtually all automobile and transit travel along the 1 25
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Figure 4: Model Performance
In order to address the magnitude of the problem, numerous alternatives were considered. A total of 27 traffic
model runs were conducted to evaluate the traffic impacts from previous and currently anticipated growth, and the
effectiveness of various transportation infrastructure improvements . Three of these alter •
Figure 4 . '
The figures presented on the following exhibit contain two sets of information , the amount of daily traffic and
projected perform line is drawn. The wider the line,
the higher the volume of traffic is that wl need to be accommodated on the system . The color of the line
represents how well the roadway will operate on a performance basis . This is based on a transportation
system ranging from
Harmony Road . The preferred
1LOS minimum standard for 125 is D, t not to fa-14 be-low E . For graphic purposes, the LOS is color coded like
a traffic signal, where green represents uncongested conditions of LOS Al 8, and C; yellow at LOS D ; orange at
LOS E ; anc rec representing co-ogestec co-n-citions or LOS F .
Weld County, Colorado, Charter and County Code Created : 2023- 11 -07 14 : 42 : 54 [ EST]
(Supp. No . 85 )
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CHAPTER 8 - Public Works
APPENDIX 8 - K
The first alternative represents existing and c- u-rrently planned transportation improvements identified above as
" North Front Range Regional Transportation Plan Improve
in 2020, as identified in Figure 4, " 2020 Projection with Committed Network . " These development levels were
forecast in 1998, before much of the current growth cycle had occurred .
The second alternative also represents the existing and currently planned transportation improvements, but
combined with development levels identified in Figure 4 as " Anticipated Development with Committed Network . "
btained from a the jurisdictions a ong tie Corridor indicates
WS F—congestion and likely gridlock —all along 4 25 from Berthoud to Fort Collins . Furthermore, the anticipated
development and congestion levels along 125 will result in failing levels of service along the frontage roads, north
south roadways, and east west roads that serve the 125 Corridor .
The third scenario represents the introduction of a system of local roadways both east and west of the Interstate
Highway, to serve local and mid dicta-nce trips within the Corridor. The performance of this alternative is shown in
widening of 125 from its current four lane configuration to six or eight lanes . Based on this analysis, it was
determined that the six lane option was not adequate to accommodate future demand . The eight lane freeway
The widening alternative was also problematic because the 125 Corridor has insufficient right of way to
accommodate both widening and the proposed 1 25 TAFS recommended improvements for Commuter Rail .
LOCAL ROADWAY ALTERNATIVE
In rev. ,
of development planned to occur in the Corridor . One of the primary observations determined from this phase of
development, other than a system of county roads that are discontinuous . Therefore, it was determined that the
• What system of local road y to accommodate future demand, and
To help evaluate these issues, a north south four lane road located east of the interstate was tested as an alternative
to widening the 125 freeway . The results of the first alternative concluded that although traffic would utilize this
e traffic along 125 to a point where
acceptable evels of service wou c be experiencee. Tiis scenario also incicatec Hat even witi an aggressive transit
still be necessary .
A follow up alternative examined a six lane arterial , also east of 1 25 . From this alternative, it was determined that a
Corridor; however, the size of a s-ix lane arterial raises other issues that need to be addressed . Major concerns were
identified with a six lane arterial, particularly land use compatibility issues .
As a result of these concerns, closer examination was made as to where along the Corridor six lanes were required
,
was determined that the primary need for a six lane arterial was within the Crossroads Boulevard Subarea . As
mentioned previously, a sep n during the same time frame of this study,
Subarea.
Weld County, Colorado, Charter and County Code Created : 2023 - 11 - 07 14 : 42 : 54 [ EST ]
( Supp . No . 85 )
Page 21 of 43
CHAPTER 8 - Public Works
APPENDIX 8- K
The Crossroads Study proposed a low Lane County Road 5 from US 34 to SH 392 with additional north south internal
• or Plan and it was
found to meet the transportation needs within this port ' on of the Corridor.
It should be emphasized that many of the recommended roadway improvements are contingent upon the
anticipated growth in the Corridor . Most roadway improvements will not be built to maximum capacity i-n the next
, • i- 2 fan e co-u-nty road that
expanded if and when the intensity of adjacent development requires it . It is critical for communities to be able to
allows for
uses .
SSUES ASSOC A--ED W _eh S AL—ER \A-- VE
terminee tiat neecec to be accressec .
These issues included the alignment for this north south roadway; the need for other -connecting improvements and
,
how far from 125 could t nis roadway be located yet still be effective .
souti arteria . Basec on some of t ne
•
ar east resulted in a marked reduction
in its attractiveness as an alternative to 125 . The need for other connecting improvements,
of a continuous north south roadway west of 125, were addressed in the preferred concept plan described in the
section that follows .
D.O-)OSE ) 25 CORK DOR CONC€ D UAL aRA1 S7OR-A- On ?LAN
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
(Supp . No . 85 )
Page 22 of 43
CHAPTER 8 - Public Works
APPENDIX 8-K
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The recommended arterial improvements for the Corridor include both no-gel/south art •
on either side of 125 and east/west connections to 125 . To the extent possible, the arterial improvements were
based on current jurisdictional Master Street Plans .
f the study area as Timberline
er lane arterial south of
Harmony. From this point, i-t extends sou-th to County Road 32 . Because Boyd Lake is located south of County
port i sout i arteria be c irecteo tot -le sout iea-st a ong tie a ignment of tie Union Pacific Rai roar. , unti its
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 :42 : 54 [ EST ]
(Supp . No . 85)
Page 23 of 43
CHAPTER 8 - Public Works
APPENDIX 8 - K
intersection with County Road 9. This connection is consistent with the Crossroads Boulevard Subarea
Improvement Plans and the Loveland Transportation Plan . This north west to south east diagonal roadway has
ditianal east
west crossing of 125 between the US 34 and Crossroads Interchange.
( Boyc La <e Avenue: is proposes to be a four - lane arteria unti - its intersection
with SH 402 . South of Loveland, the north south arterial is proposed to occur along the existing CR7 . In review
impact east west traffic along SH402 or 54-4 60. As true with any of the Recommended Roadway Network
recommendations might be made provided the north south connections are made .
existing CR5 . This arterial
nath . To avoid impacts
to Timnath, the north south arteri-al would bypass the town to the east end then oe � t n
near CR 38 . Souti of Crossroads Rau eva-rc t e norti sou-ti roan wou c jog slig i-t y to tie east wiere it
intersects with US 34 and continue to the southeast and connect with CR 3 . The north south arterial woe
proceec a ong CR 3 ti between CR 16 a-n-c SI-i 60, wiere it wou c s lift to tie west anc continue to souti of S
56 .
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
( Supp . No . 85 )
Page 24 of 43
CHAPTER 8 - Public Works
APPENDIX 8-K
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East/West Arterials
In addition to the north south arterials east and west of 125, c st and west arterials would be necessary to connect
),
Vista Drive, Vine Drive, Prospect Road, Crossroads Boulevard, 5"H 402, and SH 56 .
Interchange Improvements
long 125 . Other than the recently completed I -
,
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
(Supp. No . 85)
Page 25 of 43
CHAPTER 8 - Public Works
APPENDIX 8- K
Highway 14 interchange, have already been proposed . Other interchanges, including US 34, Crossroads Boulevard
Crossroads Boulevard Subarea Traffic Study . Specific improvement requirements for other interchanges have not
been identified .
Accompanying the roadway improvements are significant recommendations for transit, bicycle, and pedestrian
facilities . The recommendations are presented in Figure 6. A key component of the transit element is the planned
commuter rail service between Fort Collins and Denver, as identified in the North Front Range Transportation
Alternatives Feasibility Study .
Complementing the commuter rail service is regional bus transit service along the I 25 Corridor, +rig existing
accition, ong term p ans for transit service a - ong tie 125 Corridor will need to incorporate parallel and feeder
service, provicing connections into t ie Corricor from deve opec areas located to the east and west . On street bicyc e
anes s -iou c be incorporatec into a new arteria s anc co ectors tiat are constructec wit iin tie 1 25 Corricor. As
this infrastructure is constructed, a comprehensive bicycle network will unfold and provide direct connections
between major population and retail/employment areas . An important part of these connections will be the
integrat+on of future facilities with regional trail) identified in the various city and county plans within the Corridor .
transit faci ities anc user cestinations wit uin activity centers in tie Corricor .
The performance of the preferred transportation plan alternative is illustrated in Figure 4 as "Anticipated
Development with Proposed Network . " It represents the existing and currently planned transportation
improvements as contained in the North Front Range Transportation Plan, but combined with the additional
Figure 3 as " Anticipated Development . " Altnoug u t uis p an wi resu tin roadway congestion eve s greater t Ian wiat
currently exist today, this -scenario avoids congested conditions typical of many urban areas, and represents a
in the plan will mitigate what would- otherwise be congested conditions along the east west arterials, frontage roads,
and other roadways that are likely to occu-r without a concerted regional effort to address mobility in the Cora-d-or
REGIONAL PARTNERSHIP AREAS
The 1 25 Corridor Transportation Plan defines an overall framew
unities along the
mendations defined in
l
improvements can best be met at a more localized level . The 1 2
effort between Larimer County, tie City of Fort Co i-ns, tie City of Love and, Tie Nort u Front Range Transportation
south and County Road 32 on the north . The study include , he development of funding;
work effort ha-s been highly successful , and can serve as a model for other areas within the Corridor.
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
( Supp . No . 85 )
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CHAPTER 8 - Public Works
APPENDIX 8- K
•
dditional study areas, defined as -Regional
ens- + p-Ar s, as e -i figure 7 . -n total, five areas have been identified , as follows :
This area consists of the northern portion of the 125 Corridor . It includes all portions within the City of Fort
Co ins anc emerging deve opment a ong tie eastern sloe of 1 25 . Tie Soutiern boundary a ong tie west sice
of 125 is the City of Loveland, whereas the southern boundary of the east side oft25 is the Crossroads Study
Area ( RPA2 ) . RPA1 also includes the Town of Timnath and portions of Larimer County .
Tie RPA2 area is cefine° as tie Crossroads Stuoy Area and examines current ane proposes °eve opment a ong
the eastern side of 1 25 from north of SH 392 and to the south of US 34. This study area includes the proposed
Larimer County Fairgrounc s anc portions of tie Town of Wincsor anc tie City of Love anc .
RPA 3- Loveland, Larimer County
The RPA3 area is within the City of Loveland along the west side of 125, and includes portions of Larimer
County .
The RPA4 area picks up the southern portion of the Corridor along the cast side of 125, beginning at the
southern terminus of RPA2 ( Crossroads Study Area ) . Because this segment is at the southern end of the
h of the 125 Study
Area project will be important for continuity .
RPA 5- -Berthoud, Weld County
The RPAS area focuses on future development within the Town of Berthoud, cast of 1 25 and connections to
the north and south .
This plan recommends that the jurisdictions of each of those -Re-giona-1 Partners +-p Areas work together in a
manner similar to the Crossroads Study effort, conducting a detailed transportation evaluation, examining
growth and development .
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST]
( Supp . No . 85 )
Page 27 of 43
CHAPTER 8 - Public Works
APPENDIX 8-K
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ir I fit:: . 4
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PHASING OF IMPROVEMENTS
RG- � strtetegic pia ing of imr� royement i cr►+,cal to both aevelopment re atec traffic wituin tie RPA and tie
Cato-n- and Air Chi-al-14y Planning Counci - . However, the key to assure ultimate Corridor
improvements is to have the local jurisdi-ctions within each RPA require right of way dedication of the north south
cal jurisdiction
it the precise
appropriate mitigation will be necessary .
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
(Supp. No . 85 )
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CHAPTER 8 - Public Works
APPENDIX 8- K
\O?—'— SOU— AR—ER A _ AN D 25 \'E ?C'bA \G€ J ES GI% GU 307. . \ ES
efficient traffic flow . These design guidelines address such criteria as the preservation of right of way, roadway
cross sections, and accers standards . It is further recognized that the character and design of the north south
• activity center, in a transition area between
centers, or in the more rural portions of the Corridor.
•
tie 125 Corrioor . It is important to note t iat t -lose are guice ines ano not standards . Detai ec p annin-g anc traffic
ine the appropriateness and application of
these standards .
These recommended guidelines are not intended to replace other standards and requirements that communities
may -have i-n place for the Corridor; rather, they are intended to supplement-those standards, and to serve as a guide
for communities that do not yet have standards in place for roadways within the Corridor .
Criteria Parameter Activity Centers Transition Areas Rural Areas
Higher Density tower Density Agricultural;
Residential, Vacant, Open
Commercial and Some Space
Business Centers Business/Retail
Right of Way Width 115 ' 115 ' -
Roadway Width ( including 8' 83 ' 101 '
median )
Median Mid Block Width 19 ' 24'
Adjacent to Left 12 '
Turn Lane
Design Speed M P H
Speed Limit MPH
Travel Lanes tt of Lanes
Width
Bike Lanes Designated ( Y or
Width
Parking Lanes Width None None None
Sidewalk Width 6 ' Optional
Parkway Width ( min . ) 10 ' 10 '
Street Lighting 14-o
Signals Signals Per Mile 0. 5
Median Full Openings
Openings Per Mile
Weld County, Colorado, Charter and County Code Created : 2023 - 11 -07 14 : 42 : 54 [ EST ]
(Supp . No . 85 )
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CHAPTER 8 - Public Works
APPENDIX 8- K
3` Openings Pet
Access Locations Per 4
e
Curb & Gutter Yes Yes Me
Left Turn Feet + Storage 31-0 435 500
Deceleration
Lane
Right Turn Feet x-50 760
Deceleration
Lane
Acceleration Feet 380 550 760
Lane
Sight Distance Feet 275 325 620
Along Arterial
Entry Sight 650
Distance
1t'E ?CrANGE DES GI\ GU DE _ \ ES
rural and agriculture uses . As a result, as new development occurs along the Corridor, the current interchange
north/south arterial design guidelines, it is also important to establish minimum design guidelines for the
ment from encroaching � r� i -cent to the existing
interchanges and preclude opportunities for future interchange modifications .
Based on minim -urn sta-ncares to acco-m a-te baf< to-bac< eft turn a-nes across tie interc range overpasses, it is
recommended that at a minimum 660 feet of ri-gh-t of way be preserved between the northbound and southbound
on and off ramps . It is further proposed that the minimum distance for an adjacent frontage road or signal not be
closer than 600 feet, and preferably 1,000 feet, from the adjacent interchange on and off ramps .
• and style interchange,
similar to the recently completed 125/Harmany interchange. In certain locations, other interchange improvement
designs might be examined and recfu4-re different rift of way preservation requirements .
FUNDING
list of transportation improvement needs that exceed current
available funding. This 125 Corridor Plan will not in and of itself solve that problem . It is further recognized that
improvements along the Corridor .
•
•
•
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( Supp . No . 85 )
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CHAPTER 8 - Public Works
APPENDIX 8- K
tie 1 -25 Corridor las oemancs for transportation faci ities t iat arc regiona in nature, not a of wiici i are attributab e
to development within the Corridor. Many of the improvements that -are needed in the Corridor result from
development activities outside of the Corridor, as well as growth in traffic from existing residents of the area . Thus
it is reasonable to assum • serve area communities
nd that development in the Corridor can only be expected to be part of the funding
solution .
As part of the planning process, sketch plan level cost estimates were developed for the- arterial improvements
the Corridor. These arterial improvement
cost estimates focused on north south arterial improvements and east west arterials serving 125, which were not
included in current jurisdictional transportation plans . These costs estimates do not include local or collector level
improvements. The total arterial improvements cost •
.
In addition to the arterial improvements, sketch plan-level cost estimates were developed for interchange
jor reconstruction with
an overall cost estimate at approximately $ 175 million . Total- new arterial improvements and interchange
There are a variety of funding solutions that will need to be considered in developing the appropriate approach for
improvements within the Corridor . It is recommended that aach of the Regional Partners
detailed transportation study, modeled after the Crossroads Boulevard Subarea effort, to determine local
deve opment impact r * n improvements within their area .
Some of the mechanisms to be considered for the funding of local improvements in the Corridor include the
following :
Transportation Impact Fees—These are fees imposed on new development, dedicated to the purpose of
yeas that are impacted by the new development . Impact
may be possible to levy a regional impact fee to apply to all development within the Corridor, to be used for
Improvement Districts—Special Districts ( such as Title 32 Metropolitan Districts or Special Improvement Districts )
nsporta loping areas:
Sa es Tax S wring—T uis concept entails tie " rebate " of a
ments needed to support new retail
development .
risdictions along 125, highway interchanges
egional
t uat uas tie power to co ect revenues for transportation projects from sa es anc use taxes, a motor vc uic e
registration fee or a Visitor Benefit Tax . The formation of an RTA w
residents within its boundaries, but would serve a-s a promising source of funding for regional transportation
projects .
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(Supp . No . 85 )
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CHAPTER 8 - Public Works
APPENDIX 8-Q WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA
APPENDIX 8- P RIGHT- OF -WAY USE PERMIT
The intent of the Right-of-Way Use Permit is to regulate and permit the use of Weld County' s public right-of-
way by private companies, municipalities and/or special districts constructing and burying lines either crossing or
running parallel within Weld County right-of-way . Crossings are allowed for all lines . Parallel installations are allowed
for lines of " public utilities " that are defined in CRS 40- 1 - 103 and are " domestic or foreign electric light power, gas,
or pipeline companies " holding current Certificates of Public Convenience and Necessity issued by the Colorado
Public Utilities Commission ; for water lines of municipalities, water districts, and water and sewer districts ; for
transmission lines or pipelines used solely for agricultural purposes ; for fresh water above-ground transfer pipelines ;
for lines in non -maintained right-of-way if approved by Weld County based upon locational factors, such as,
surrounding population density, topography, or if the right-of-way provides access to a recorded exemption lot, and
with Permittee 's agreement to move the line at its sole expense if Weld County or an annexing municipality intends
to improve the right-of-way; or if authorized by the Board of County Commissioners in an appeal of the denial of a
Right-of-Way Permit application, pursuant to Weld County Code Section 8- 13 - 110 . Public right-of-way subject to
regulation by the Right-of-Way Use Permit includes Weld County' s maintained and non - maintained, and all public
drainage easements . A Right-of-Way Use Permit grants the Permittee and its Contractors permission to occupy
designated County right-of-way . The Permit authorizes excavation , surveying, and/or construction of facilities within
the County right-of-way and provides for their subsequent restoration upon completion of the Project . The Permit
is issued solely for the Permittee ' s and its Contractor ' s construction of the Project . Permittee is prohibited from
changing the use of the Project in any way without first obtaining a new permit .
SUBMITTAL REQUIREMENTS
1 . Complete application . Permittee must submit a complete Right-of-Way Use Application and include
required submittals for review and consideration of its Project . If the Project is approved , a Right-of-Way
Use Permit will be issued to the Permittee . It is the Permittee ' s responsibility to inform its Contractor of
all Permit requirements, Provisions, and attached Special Provisions .
2 . Drawing, plan set, and map . A drawing, plan set and map are required to be submitted with the
Application . Detailed plan ( s ), sketch , and/or map ( s ) showing the work location and roadway, edge of
roadway, County ROW lines and width, at least one crossroad , and a legend . It is preferred , that drawings
be 11x17 or capable of being printed out in 11 x 17 . All underground installations must include a cross
section typicaldrawing showing depth of line being installed per County requirements based on the
lowest point of the County ROW and show the County ROW width Engineer stamped plan and profile
drawings are required for underground installations running parallel within a roadway. Drawings at
intersections must be in plan and profile, and shall be at a scale of 1 : 100 or as determined by the
Department of Public Works .
3 . Traffic Control Plan . A Traffic Control Plan ( TCP ) or Method of Handling Traffic ( MHT) must be submitted
and approved prior to Permittee ' s commencement of work . Permittee shall provide all necessary traffic
control in accordance with the Manual on Uniform Traffic Control Devices ( MUTCD ) in drawing form ;
narratives will not be accepted .
( a ) Flaggers shall be required at any locations where there is encroachment into a travelling lane .
( b ) Full road closure requests must be prepared by and signed by a Traffic Control Supervisor (TCS ) .
( c) Full road closures exceeding three ( 3 ) days shall require approval of the Board of County
Commissioners .
4 . Insurance . Permittee and/or its Contractor shall secure and maintain insurance policies and/or provide
proof of adequate self-insurance that will protect itself, its sub-contractors, members of the public who
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CHAPTER 8-Public Works
APPENDIX 8-Q WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA ,
use the right-of-way associated with the Project,and Weld County,Colorado,from claims for bodily
injury,death,or property damage which may arise from the construction of the Project,or caused by
the facilities which are constructed as permitted herein The Board of County Commissioners of Weld
County,Colorado,its officers,and employees must be named as an"Additional Named Insureds"in all
liability insurance policies secured by the Permittee and/or its Contractor The following insurance
policies and amounts are required Certificates of insurance evidencing such policies shall be delivered
to the Weld County Department of Public Works
(a) Statutory Worker's Compensation
(b) Contractor's public liability and property damage in the following sums
Bodily Injury Property Damage
Each person I$1,000,000 Each accident $1,000,000
Each accident $1,000,000 Aggregate $2,000,000
(c) Automobile public liability and property damage in the following sums
Bodily Injury Property Damage
Each person I$1,000,000 Each accident I$1,000,000
Each accident $1,000,000
5 Bonding and Surety If determined necessary by Weld County's Department of Public Works,Permittee
shall provide a surety bond or other security for the total amount required to restore the right-of-way
under which the Project is to be installed or constructed,based upon current Weld County Department
of Public Works contract prices for the performance of such work Said collateral shall remain in effect
for a period of two(2)years after inspection of completed construction by Weld County Department of
Public Works Whether or not covered by a bond,Permittee shall reimburse Weld County for all expenses
incurred by it as the result of,or related to,the failure by Permittee or its Contractor to perform all
installation,construction,maintenance or other work pursuant to this Permit in a workmanlike manner
6 Geotechnical Submittals The Weld County Department of Public Works reserves the right to request
from Permittee geotechnical submittals if deemed necessary
The grant of this Permit is conditioned upon Permittee's and its Contractor's compliance with the General
Provisions,Construction Provisions,Pipeline Provisions(if applicable),and General Matters set forth below By
accepting this Permit,Permittee and its Contractor agree to comply with the terms and conditions set forth herein
GENERAL PROVISIONS
1 Permit Required
(a) Commencement of construction prior to receiving an approved Permit will result in applicable
penalties(see emergency repair section for exclusions listed as item number 12)
(b) Contractor must have a copy of this Permit on site during construction of the Project
(c) This Permit requires commencement of construction within three(3)months from date issued
unless otherwise stated The Permittee may apply for an extension if work is not completed before
the expiration of three(3)months All applicable fees must be paid before extension will be issued
2 Inspection Inspection of work performed in Weld County right-of-way is required The Weld County
Department of Public Works must be notified 48 hours prior to commencing all work within Weld County
Weld County,Colorado,Charter and County Code Created 2023-11-07 14 42 54[EST]
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CHAPTER 8-Public Works
APPENDIX 8-Q WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA
right-of-way Final inspections are required Weld County shall have the right to order Permittee or its
Contractor to stop work anytime Weld County believes that a violation of this Permit has occurred or if
there is a danger to the safety of the public if the work continues
3 Additional Permits Permittee shall be responsible for obtaining all other state,federal,or local permits
which may be required of Permittee and/or its Contractor to install and/or maintain its Project
Permittee shall provide evidence of such other permits upon request by the Weld County Department
of Public Works
4 Determination of Placement Weld County reserves the right to determine the specific placement of the
Project within its right-of-way
5 Suspension of Work Weld County's Department of Public Works shall have the authority to suspend
work,wholly or in part,because of the failure of Permittee to properly execute the work in accordance
with this Permit Notwithstanding the issuance of this Permit,Weld County reserves the right to make
or to require Permittee to make any changes,additions,repairs or required relocation of any facilities
within the dedicated right-of-way at any time
6 Setback Requirements By accepting this Permit,Permittee hereby waives its right to require industry
setback requirements which it might otherwise require from other utilities which may be placed in Weld
County's right-of-way and relinquishes its authority over the placement of all other electric,power,gas,
communications or other conduits,pipelines,appurtenances,or irrigation structures which Weld County
may allow to be placed in its Right-of-way Weld County must approve location prior to construction
7 Compliance with Utility Notification Requirements Permittee and/or its Contractor shall comply with all
applicable requirements of C R S§§9-1 5-101,et seq,and be responsible for locating all existing utilities
and registering all new lines with 811 Contact the Utility Notification Center of Colorado at 811 or 1-
800-922-1987 at least two days in advance of digging Markers and flags are valid for 30 days Permittee
must remove all utility locates such as flags and marker pins from the right-of-way once the construction
is complete Any subsurface utility engineering notification sent to the Colorado Notification Association
shall also be sent to the Weld County Department of Public Works
8 No Damage to Other Projects No culverts,irrigation structures,drain lines,utility lines,or any other
Projects or facilities within the right-of-way are to be cut or damaged In the event Permittee or its
Contractor damages an existing facility,Permittee shall first notify the owner and either immediately
repair and replace the damaged facility or pay the owner to repair and replace the same in accordance
with the desires of the owner
9 Emergencies Permittee shall report all emergency repairs to Weld County Public Works immediately
upon being advised that an emergency exists During such repairs,Permittee shall utilize proper traffic
control measures Permittee shall apply for a Right-of-Way Use Permit and make the required repairs as
soon as practicable after the Weld County Department of Public Works is notified of the emergency
situation and the need for such repairs In no event shall such repairs be completed later than 24 hours
after receiving such notification,unless adverse weather conditions prohibit the repair process
10 Changes Made to the Right-of-way-Permittee's Financial Responsibility In the event changes are made
by Weld County to the right-of-way or appurtenances within the right-of-way that would necessitate
removal or relocation of the Project,Permittee shall do so promptly at its own expense upon the request
of Weld County
11 Permittee Responsible for All Project Related Expenses The construction,operation,maintenance and
repair of the Project constructed by Permittee,and all other improvements described in this Permit,shall
be at its own expense and without the aid or use of Weld County funds
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12 . Permittee Solely Responsible . Permittee or its successors and assigns, remains solely responsible for all
matters pertaining to the Project and all costs associated with or pertaining to the Project . These
responsibilities include, but are not limited to, the following : repair and maintenance of the physical
components of the Project ; removal of the physical components of the Project upon retirement of the
use or following the request of Weld County to remove the Project ; cooperation with Weld County and
other Permittees whose projects are placed in Weld County ' s right-of-way .
13 . Successors and Assigns of Permittee . It is mutually understood and agreed that this Permit and all the
terms and conditions hereof shall extend to and be binding upon the Permittee and its successors , and
assigns .
CONSTRUCTION PROVISIONS
1 . Road Crossings . All underground installations crossing maintained or non - maintained Weld County
roadways and right of waysroad rights-of-way shall be by directional bore unless otherwise approved by
Weld County Public Works .
2 . Parallel Installations . Parallel installations within the untraveled portion of Weld County road right -of-
way may be performed by bore, trenching, plowing, drilling or excavation . Parallel installation methods
within the traveled portion shall be determined by the Department of Public Works .
3 . Bridge Structures .
( a ) No lines shall be attached or otherwise placed along or upon any Bridge structure or wing walls .
( b ) No continuous line shall be installed crossing under a bridge structure .
( c ) Underground projects installed parallel to a bridge structure must maintain a minimum clearance
of five feet ( 5 ' ) from all wing walls and pilings .
4 . Minimum Cover for County right of wayRoad Right-of-Way dnstallations . All depth requirements are
minimums and are subject to approval or modification by the Department of Public Works based on
engineering and safety standards and existing utilities in the roadright-of-way . In no event shall any
facilities be installed in Weld County road right-of-way at depth less than four feet (4 ' ) from top of line
measured from the lowest point of the road right-of-way .
( a ) Dry utilities shall be installed at a minimum depth of four feet ( 4 ' ) from top of line measured from
the lowest point of the road right-of-way ( flowline ) .
( b ) Wet utilities shall be installed at a minimum depth of six feet ( 6 ' ) from top of line measured from
the lowest point of the road right-of-way ( flowline ) .
( c) All types of oil and gas lines shall be installed at a minimum depth of ten feet ( 10 ' ) from top of line
measured from the lowest point of the road right-of-way ( flowline ) . Concrete surfaces shall be
crossed at a minimum depth of fifteen feet ( 15 ' ) from top of line measured from the lowest point
of the road right-of-way ( flowline ) .
( d ) All line types crossing . on - maintained ro d right-of-way shall be at a minimum depth of four feet
( 4 ' ) from top of line measured from the lowest point of the road right-of-way ( flowline ) .
( e ) Culverts must have a minimum of twelve inches ( 12 " ) of cover .
5 . Daily Construction Requirements . At the end of each day during the installation and construction of the
Project, Permittee shall observe the following requirements :
( a ) Working hours allowed under this Permit are from Sunrise to 1/2 hour prior to Sunset .
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( b ) All materials shall be removed a minimum of ten feet ( 10 ' ) from outside edge of the road shoulder .
( c ) All excavations upon the traveled portions of the road right-of-way shall be back-filled in
accordance with the compaction requirements set forth below unless otherwise approved by Weld
County .
( d ) All traffic signs must be in place per the approved Traffic Control Plan or removed or covered if not
applicable to nightly activities .
6 . Equipment Movement and Equipment Crossings .
( a ) Movement of cleated or track equipment is restricted to the immediate work area . Equipment
shall be transported to a proper unloading area . No cleated or track equipment may work on or
move over any road way surface without mats .
( b ) Equipment crossings shall require a separate permit and must meet safety and sight distance
criteria for approval . Crossings are, in line with the Project and , shall be built up level with the road
surface with a practicable anti -tracking material to prevent damage to the road surfaces and
shoulder areas . Crushed concrete is prohibited for use as a surface material . A minimum of a
twelve-inch ( 12 " ) culvert shall be placed in ditch areas under tracking pad to maintain proper
drainage . Existing ditch and upstream and downstream culverts must be observed in determining
appropriate drainage culvert size .
7 . Site Markers . Permittee shall mark the site of the construction of the Project, whether permanent or
temporary, with markers acceptable to Weld County Department of Public Works . Markers shall be
placed as far from edge of road as to not interfere with normal road maintenance .
8 . Future Line Location . The installation of non -ferrous lines in the road right-of-way shall require a suitable
means to facilitate future line location such as, but not limited to, metallic warning tape installed above
the line and registration with 811 .
9 . Concrete Surfaces . There is a strict no cut policy on all concrete surfaces, which includes potholing. Any
damage or cutting of concrete surfaces will result in the Permittee being responsible for the cost of a full
replacement of concrete panel ( s ) by a Contractor approved by Weld County . Bore grout may be required
for underground crossings of concrete surfaces .
10 . Asphalt Surfaces . Asphalt surfaces are not to be cut unless approved by the Weld County Department of
Public Works . If an asphalt surface cut is granted , the cut shall be repaired with a flowable fill cement
( refer to Section 11 . Compaction Requirements, below) and hot bituminous pavement and/or concrete
placed at a thickness of existing plus one ( + 1 ) .
11 . Compaction Requirements .
( a ) All compaction of backfills and road surfaces shall be compacted in accordance with the most
current versions of the Colorado Department of Transportation ( CDOT) Standard Specifications for
Road and Bridge Construction and Field Materials Manual .
( b ) All backfills located within an existing asphalt surface or under the asphalt not currently in place
but will be as part of a new road construction , must be compacted using flow-fill cement in the
upper three feet ( 3 ' ) of backfill .
( c ) If any wet or non -compactable materials are produced from excavations, they shall be completely
removed from the road right-of-way and replaced with compactable materials . 1 he road right-of-
way shall then be returned to the original grades and cross sections . Weld County Department of
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Public Works shall have the authority to determine what materials shall be discarded and what
materials shall be acceptable as replacement .
( d ) On gravel roads where excavation materials are stacked on the road surface, road base of 3--1 . 5
inch surface gravel as specified in Chapter 9 of the Weld County Engineering and Construction
Criteria Manual (Appendix 8 -0, specifications for surface gravel shall be spread over the entire
road surface at a minimum depth of six inches ( 6 " ) upon completion of the work . Shoulders on
paved roads or barrow ditches where excavation is done shall require a minimum of four inches
(4 " ) of 3/-inch Class 6 aggregate road base material . Recycled Concrete will not be substituted for
Class 6 aggregate road base . These amounts are minimums and do not supersede any
requirements within the Permit .
( e ) On gravel roads where excavation is done within the roadway, backfilling lifts greater than eight
inches (8 " ), but not exceeding twelve inches ( 12 " ), shall be permitted providing that Permittee has
suitable equipment to properly compact the depth of lift placed . Weld County Public Works shall
determine if Permittee ' s equipment and the depth of backfill lift is appropriate . Ninety-five percent
( 95% ) of a standard proctor shall be required at any trench depth or in replacement of any
materials within the traveled portion of the road right-of-way . Eighty-five percent ( 85 %) of a
standard proctor shall be required at any trench depth or in replacement of any materials off the
traveled portions of the road right-of-way . Installations running parallel within a gravel roadway
will require a final placement of a minimum of six inches ( 6 " ) of surface gravel after all of the Project
has been placed and compaction test results are in compliance .
(f) Potholes in gravel surfaces shall be filled completely with road base and compacted . Potholes in
asphalt shall be filled with a cement/grout to existing thickness plus 1 ( + 1 ) or filled with a
compactible base material and the final placement a HMA or concrete material of existing
thickness plus one ( + 1 ) . Cold patching material is not an acceptable method of restoration .
12 . Reseeding . Permittee shall reseed, with a seed mix approved by Weld County Department of Public
Works, all areas within the road right-of-way in which vegetation was removed or disturbed during the
installation of its Project .
13 . Points of Access . Permittee shall install manholes and other points of access to underground lines within
the boundaries of the road right-of-way outside the normal wheel path of the roadway so that they do
not obstruct maintenance operations within the road right-of-way . Permittee shall, at its sole expense,
adjust access points, when requested to do so by Weld County .
14 . Survey Monuments . Permittee or its Contractor shall preserve or replace all survey monuments or
benchmarks at each work site . If such monuments or bench marks are destroyed , Permittee shall hire a
registered land surveyor to replace destroyed monuments or bench marks . If Permittee chooses to
preserve such monuments or benchmarks, it shall also hire a registered land surveyor to complete such
preservation .
15 . Permittee s Obligations Regarding Surveys .
( a ) All surveying performed within the boundaries of the road right-of-way shall be conducted with
proper safety equipment and advanced warning signs ;
( b ) Surveying permit holders can be issued an annual permit .
( c) Any excavation within the boundaries of the road right-of-way will be backfilled with the same
material or better than what was excavated .
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( d ) Weld County Department of Public Works offers free monument boxes and lids to Permittee to
establish , upgrade or perpetuate the location of an aliquot corner of any section on a paved road .
Permittee shall furnish the location of the section corners being preserved to the Department of
Public Works when obtaining monument boxes .
16 . Permittee ' s Obligations Regarding the Completion of Project .
( a ) Permittee shall place surface gravel , as specified in Chapter 7 of the Weld County Engineering and
Construction Criteria, on all surfaces where any damage has occurred to the road surface from
equipment, trenching, or storage of material . Weld County shall determine the damaged areas,
remedial work required, and timing of said work .
( b ) Permittee shall complete road restoration including, but not limited to, clean - up ( including utility
markers ), repair of damaged facilities, trench compaction , and replacement of gravel shall be kept
within one ( 1 ) mile of new excavation .
( c ) All disturbed portions of the road right-of-way or damaged road surfaces are to be returned to
their original condition prior to demobilizing . If the road right -of-way is not returned to original
conditions, Weld County may perform or contract such remedial work and Permittee shall pay for
all work or forfeit its surety bond in order to pay for all work done .
( d ) Permittee shall own , maintain, operate and repair any line installed or constructed herein in
accordance with the regulations, conditions and terms of this permit . No lines installed within
County rights -of-way may be abandoned by the owner at any time . Although the lines may be
retired , they may not be abandoned and all responsibility for such lines remains with the owner .
The County does not recognize, nor accept, any lines designated by any other source as
abandoned , and the County will continue to expect such lines to be maintained or removed by the
Permittee .
17 . Line Retirement . Retirement of lines in Weld County road right-of-way are still required to be located as
part of 811 . If Weld County approves a line to be retired , the retirement of an existing line in the road
right-of-way shall be subject to conditions as determined by the Weld County Department of Public
Works based on the age, condition , material type, and size . Permittee shall cut, cap, and fill
Projcct( s }lines that are not required to be removed .
18 . Line Abandonment . If Permittee desires to abandon a line from being located as part of 811 notification ,
Permittee shall completely remove the line from Weld County road right-of-way, unless otherwise
approved by Weld County.
19 . Drainage Interference . Permittee shall not obstruct the natural free and clear passage of water along the
roadside ditch flow lines or other waterways . If surface drainage is to be affected , Permittee is
responsible for the proper disposition of the runoff.
PIPELINE PROVISIONS
1 . Natural Gas/Crude Oil Pipelines .
( a ) Road crossings for natural gas/crude oil pipelines must be by directional bore, only .
( b ) Above-ground appurtenances and /or equipment are not permissible for installation within the
County road right -of-way and must comply with setback requirements .
2 . Permanent Fresh Water ( Non - Potable ) Pipelines .
( a ) Road crossings for permanent fresh water ( non - potable ) pipelines must be by directional bore,
only .
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( b ) Permanent fresh water ( non - potable ) pipelines must extend past future road right-of-way prior to
daylighting .
( c) Above ground appurtenances and/or equipment are not permissible for installation within the
County road right-of-way and must comply with setback requirements .
( d ) Weld County approval is required for any change of use or retirement of a permanent fresh water
( non -potable ) pipeline .
3 . Temporary Fresh Water Above-Ground Transfer Pipelines .
( a ) Fresh water aAbove-ground transfer pipelines are allowed as a temporary use for a period of 6
months or less for both road crossings and parallel installations . See the limitations and restrictions
set forth below depending upon crossing methods .
( b ) Fresh water aAbove-ground transfer pipelines may transfer fresh or recycled water and dairy
irrigation slurry, only .
( c) The source of water must be disclosed on the Right-of-Way Use Application and location maps .
( d ) The use of ninon -maintained Weld County road right-of-way for temporary fresh water above-
ground transfer pipelines shall be negotiated with the landowner( s ) .
( e ) Existing driveway culverts may not be used for water transfers and permission from property
owner must be provided for crossing private driveways or accesses .
( f) All pipelines or lay flat pipes occupying the road right-of-way ( running parallel to the roadway)
must be secured up out of the ditch flowlines and away from the road edges . They may not
interfere with normal road maintenance or impede drainage . All accesses and driveways shall be
accessible and cannot be blocked by lay flat lines . Trailer mounted pumps shall be placed on
private property and must be maintained and re-fueled on private property.
Crossing methods for temporary fresh water above-ground transfer pipelines :
1 ) Plate/ Manifold :
a . Applicable for untreated gravel roadways for a transfer duration of 10 days or
less .
b . Must be covered with Class 6 road basel 1/2" surface gravel with a minimum of
15 -foot road base tapers on each side . All forms of traffic must be able to safely
cross the plate/manifold .
c . Traffic control signs required including a speed reduction to 15 mph for the
duration of the transfer .
d . Permittee is required to maintain the crossing which includes 24- hour snow
removal in winter .
2 ) Culvert Sleeve :
a . Applicable for longer term transfers crossing untreated gravel roadways only.
b . Maximum culvert size is 1San 18" outside diameter for a single line transfer and
24' outside diameter Elliptical for a double line transfer unless approved by the
Weld County Department of Public Works .
c . Minimum of 18 " of Class 6 road basel . 5" surface gravel cover on culvert .
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d . Compaction tests of road base is required after culvert is removed if flowable fill
is not used for final restoration of the roadway .
3 ) Existing Culverts :
a . Requests for use of existing County culverts ( any culvert crossing under a County
maintained roadway or intersection ) are subject to special review . Use is for a
maximum of 15 days .
b . Existing culverts are not available for use from March through October .
c . Driveway/access culverts are not available for use .
d . If the culvert also serves for irrigation , written permission from the Irrigation or
Ditch Company may be required .
e . Culvert must be cleared anytime drainage is impeded due to run -off or flooding
or a significant rain or flooding event is forecasted . Shut off valves should be
placed on each side of culvert to allow for disconnection and removal .
4 ) HDPE or PVC Pipe :
a . Applicable for longer term transfers where a paved, hard surface, or treated
gravel roadway must be crossed .
b . Pipeline installation is required to be at a depth of 10 feet based on the lowest
point in the County ROW and ends must extend past future road right-of-way
before daylighting . Installation method by boring only .
c . Weld County approval is required for any change of use or retirement of the
pipeline .
4 . Produced Raw Water Pipelines .
( a ) No temporary above-ground transfers .
( b ) Pipelines will only be considered for approval that are transferring to a State and County approved
injection or recycling facility .
( c ) Casing is required for crossing under County roadways .
( d ) Casing type may be determined by the Permittee or its Contractor .
( e ) Casing maximum outside diameter is not to exceed 12 " .
( f) Casing ends must extend outside of the County road right-of-way .
( g ) If Flex Steel Pipe or equivalent with a temperature rating of 180 degrees or higher is used , casing
requirement will be waived .
( h ) Maximum size of the produced water pipeline is not to exceed 8 " and not to exceed 10 " outside
diameter ( OD + .
( i ) Requests for larger diameter pipelines will require special review by the Weld County Department
of Public Works .
(j ) Location markers shall be green in color and must list " produced water " and an emergency contact
number .
GENERAL MATTERS
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1 . Terms .
( a ) All references herein to " Right-of-Way " refer to a portion of land that is dedicated or granted to
and accepted by Weld County for transportation purposes, such as a paved or gravel roadway or
highway whether maintained or not unmaintained by Weld County . The term is used as both
singular and plural .
( b ) All references herein to " Permittee " are to any persons and/or entities applying for and being
issued this Right-of-Way Use Permit granting permission to construct their Project within Weld
County 's right-of-way .
( c) All references here to " Lines " means all underground and overhead cable, telephone, electric,
power, wire, gas and irrigation lines, and/or appurtenances, structures or pipelines .
( d ) All references herein to " Contractor" are to any persons or business entities retained by Permittee
to install the Project in Weld County right-of-way .
( e ) All references herein to " Permit " refer to this Right-of-Way Use Permit, including all Permit
requirements, Provisions, and attached Special Provisions .
2 . Weld County ' s Limited Interest in Right-of-Way . Weld County owns a limited interest in the right-of- way
and therefore, does not, by the issuance of this Permit, warrant its ownership of the right-of-way .
Permittee is responsible for determining the ownership of properties traversed by its lines, the location
of all property boundary lines, and the ownership of all right-of-way . Therefore, Permittee shall obtain
from the fee title owner( s ) of the right-of-way or others having proprietary interests in the right-of-way
such authority or rights as Permittee may need, in addition to this Permit for Permittee 's use of the right-
of-way. Permittee acknowledges and agrees that the authorization granted herein by Weld County is
subject to Permittee 's securing such authority or rights .
3 . Rights Reserved by Weld County. Permittee acknowledges and agrees that the Right-of-Way which are
the subject of this Permit exist as public right-of-way for the primary benefit of the travelling public, and
that the rights granted in this Permit to the Permittee are subject to Weld County' s rights and obligations
to preserve and maintain the right-of-way and the public ' s right to continue to travel safely upon the
right-of-way.
( a ) Subject to the right granted herein to Permittee, Weld County reserves the remaining use of the
Right-of-Way for existing and future construction , operation , maintenance, repair, replacement
relocation and abandonment of its own use and facilities .
( b ) Weld County reserves the right to revoke this Permit at any time if Permittee or its Contractor fails
to comply with the requirements of this Permit . Should this Permit be terminated for non -
compliance by Permittee or its Contractor, any lines or facilities installed prior to the termination
shall remain the responsibility of the Permittee and may be removed or maintained by Permittee
at the sole discretion of Weld County .
( c) This Permit is non -exclusive . Weld County reserves the right to allow other public and private
utilities and entities to utilize the subject right-of-way and may impose location requirements and
restrictions on Permittee in anticipation of requests by future public and private utilities and
entities to occupy the right-of-way.
( d ) Weld County reserves the right to reconstruct, widen and/or maintain the right-of-way which are
the subject Permit . In the event this work requires Permittee to incur expenses to preserve, re-
locate or maintain its Project, Permittee shall do so upon notification from Weld County at its sole
cost .
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4 Indemnification Except for the negligence of Weld County,Permittee shall indemnify and save harmless
Weld County,its officers,employees,agents,successors and assigns from any damage or loss sustained
by them or any of them,which arises by reason of Permittee's negligence with respect to the installation,
upgrade and/or maintenance of the Project
5 Hold Harmless Permittee agrees to protect Weld County and save and hold Weld County harmless from
any and all third party claims and damages which the installation and/or maintenance of Permittee's
Project and related facilities may directly or indirectly cause Additionally,Permittee releases Weld
County from any and all claims and damages to property owned by Permittee resulting from any act,
either by or on the part of Weld County or by or on the part of any third-party
6 No Assignment Permittee shall not assign any or all of its rights under this Permit without first obtaining
written consent to such assignment from Weld County,which consent shall not be unreasonably
withheld However,in the event Permittee contracts with a third-party Contractor to perform the work
associated with the installation of the Project,Permittee remains solely responsible for Contractor's
compliance with the terms and conditions of this Permit
7 Entire Permit Agreement The parties hereby agree that neither has made or authorized any agreement
with respect to the subject matter of this instrument other than expressly set forth herein,and no oral
representation,promise,or consideration different from the terms herein contained shall be binding on
either party hereto,or its agents or employees This Permit embodies all agreements between the
parties hereto and there are no promises,terms,conditions,or obligations referring to the subject
matter whereof other than as contained herein
8 Effect of Invalidity of Provision If any term or provision of this Permit,or the application thereof to any
person or circumstances shall,to any extent,be held invalid or unenforceable,the remainder of this
Permit,or the application of such terms or provisions,to a person or circumstances other than those as
to which it is held invalid or unenforceable,shall not be affected,and every other term and provision of
this Permit shall be deemed valid and enforceable to the extent permitted by law
9 No Waiver of Immunity No term or condition of this Permit shall be construed or interpreted as a waiver,
express or implied,of any of the immunities,rights,benefits,protections or other provisions,of the
Colorado Governmental Immunity Act§§24-10-101 et seq,as applicable now or hereafter amended
10 No Third Party Beneficiary It is expressly understood and agreed that the enforcement of the terms and
conditions of this Permit,and all rights of action relating to such enforcement,shall be strictly reserved
to Weld County and nothing in this Permit shall give or allow any claim or right of action whatsoever by
any other person not included in this Permit It is mutually understood and agreed that this Permit and
all the terms and conditions hereof shall extend to and be binding upon the Permittee and its successors,
and assigns
SPECIAL PROVISIONS
This Permit may be subject to additional Special Provisions Such Special Provisions are attached hereto
Permittee Signature
Printed name
Date
Weld County,Colorado,Charter and County Code Created 2023-11-07 14 42 54[EST]
(Supp No 85)
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CHAPTER 8 - Public Works
APPENDIX 8-Q WELD COUNTY ENGINEERING AND CONSTRUCTION CRITERIA
AMEND APPENDIX 8- Q WELD COUNTY ENGINEERING AND CONSTRUCTION
CRITERIA
•
weld county eng veering and construction criteria final version 2021 03 17 . pdf
2020-weld-county-engineering-and -construction -criteria -final -version -2021 -03 - 17 . pdf
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Cover PageAPPENDIX 8-Q WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA
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TABLE OF CONTENTS
Chapter 1 General Provisions 1
1 . 1 Title 1
1 . 2 Purpose and Background 1
1 . 3 Applicability 1
1 .4 Reference Documents 1
1 . 5 Interpretation 2
1 . 6 Road Acceptance 2
1 . 7 Improvements Agreements 3
Chapter 2 Road Classifications and Typical Sections 4
2 . 1 Road Classification System 4
2 . 1 . 1 Functional Classifications 4
2 . 1 . 2 Primary vs Secondary Classifications 5
2 . 2 Right-of-Way Widths 5
2 . 3 Right-of-Way Use Permit 5
2 .4 Right-of-Way Determination 5
2 . 5 Right-of-Way Acquisitions 6
2 . 6 Typical Cross-Sections 6
Chapter 3 Surveying 18
3 . 1 Survey Data - require a survey control sheet 18
3 . 2 State Plane 18
3 . 3 Monument Boxes 18
3 .4 Road Safety 18
Chapter 4 Roadway Design Criteria 19
4 . 1 General 19
4 . 1 . 1 Policy on the Use of Referenced Publications 19
4. 1 . 2 Typical Plan Set Guidelines 19
4. 1 . 3 Design Speed 22
4 . 2 Horizontal Alignment 23
4 . 2 . 1 Horizontal Curves 23
4. 2 . 2 Superelevation 24
4 . 2 . 3 Transitions 24
4 . 2 .4 Cross Slope 25
4 . 3 Vertical Alignment 25
4 . 3 . 1 Maximum and Minimum Grades 25
4 .4 Sight Distance 26
4.4 . 1 Stopping Sight Distance 26
4 .4. 2 Passing Sight Distance 28
4 .4 . 3 Decision Sight Distance 28
4 .4.4 Intersection Sight Distance 29
4. 5 Intersections 30
4 . 5 . 1 Alignment and Profile 30
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA { ' °'t I i
4. 5 . 2 Corner Radii 31
4. 5 . 3 Approval Requirements 31
4. 5 .4 Auxiliary Lanes 32
4 . 6 Cul-de-Sacs 32
4 . 7 Bridges 32
4. 7 . 1 Bridge Hydraulic Capacity 32
4 . 7 . 2 Freeboard 33
4. 7 . 3 Bridge Scour 34
4 . 7 .4 Use of HEC- RAS 34
4 . 7 . 5 Bridge Railing 34
4 .7 . 6 Minimum Structural Requirements 34
Chapter 5 Drainage Criteria 35
5 . 1 General 35
5 . 2 Drainage Law 36
5 . 3 Drainage Policy 373-6
5 . 3 . 1 Submittal Requirements 3736
5 . 3 . 2 Data Collection 3938
5 .4 Rainfall 3938
5 . 5 Runoff 39
5 . 5 . 1 The Rational Method 4148
5 . 5 . 2 Larger Basin Rainfall Methods 4746
5 . 6 Roads, Inlets, and Storm Drains 4746
5 . 6 . 1 Applicable Software 4746
5 . 6 . 2 Roadway Drainage 4746
5 . 6 . 3 Inlets 4847
5 . 6 .4 Pipes 4847
5 . 6 . 5 Manholes 4948
5 . 7 Open Channels, Roadside Ditches, and Grass Swales 5049
5 . 7 . 1 Applicable Software 5049
5 .7 . 2 Open Channels and Swales 5049
5 . 7 . 3 Roadside Ditches 5464
5 . 8 Culverts 5554
5 . 8 . 1 Applicable Software 5554
5 . 8 . 2 Sizing 5554
5 . 8 . 3 Materials 5655
5 . 8 .4 Cover 565-5
5 . 8 . 5 End Sections and Safety Grate 5655
5 . 8 . 6 Maintenance 5756
5 .9 Riprap 5766
5 . 10 Storage 6463
5 . 10 . 1 Retention 646
5 . 10. 2 Detention 6564
5 . 10.3 Dam Information 7574
5 . 10 .4 Irrigation Ditches/Private Irrigation Systems 7675
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE Iii
5 . 11 Stormwater Drainage Criteria Variances 777-6
5 . 12 Oil and Gas Stormwater Management 7877
Chapter 6 GRADING and MS4 Requirements 807-9
6 . 1 Erosion Control & Grading Requirements 8079
6 . 1 . 1 Applicability 8079
6 . 1 . 2 Grading and Erosion Control Plans 8079
6 . 1 . 3 Implementation 8180
6 . 1 .4 Grading Permit Deadline ( Fee ) & Extension 8180
6 . 1 . 5 Tracking Control 8180
6 . 2 MS4 Requirements 8483
6 . 2 . 1 Designated MS4 Areas and Responsibilities 8483
6 . 2 . 2 Applicability of MS4 Requirements 8584
6 . 2 . 3 Required Permits 8584
6 . 2 . 4 MS4 Requirements for Pre-Construction 8685
6 . 2 . 5 MS4 Requirements for Construction Activity 8887
6 . 2 . 6 MS4 Requirements for Post Construction 908.8
6 . 2 . 7 MS4 Requirements for As- Built Drawing Checklist 9492
6 . 3 Revegetation 9492
6 . 3 . 1 Site Preparation 9492
6 . 3 . 2 Seeding and Planting 9593
6 . 3 . 3 Mulching 9593
6 . 3 . 4 Maintenance 9593
6 . 3 . 5 Erosion Protection Design Criteria 9694
Chapter 7 FEMA Floodplain Requirements 9795
7 . 1 Background Information 9795
7 . 2 Floodplain Management Obligations 9795
7 . 3 FEMA Floodplains 9795
7 . 3 . 1 Floodplain Requirements 9895
Chapter 8 Traffic Criteria 9997
8 . 1 Traffic Impact Studies 9997
8 . 1 . 1 Traffic Impact Study Area 9997
8 . 1 . 2 Preliminary Traffic Impact Analysis 9997
8 . 1 . 3 Traffic Impact Study Requirements 10098
8 . 1 . 4 Traffic Impact Study Checklist 104.1.0-
8 . 1 . 5 Updating Existing Traffic Impact Studies 104102 Change in Access Use 106104
8 . 3 Temporary Access 106104
8 . 4 Traffic Control Devices and Plans 106104
8 . 4 . 1 Signage and Striping Plans 106104
8 . 4 . 2 Striping guidance 107105
8 . 4 . 3 Type and Location of Signs 107105
8 .4 . 4 New Roadway Signage 107105
8 .4 . 5 Memorial Sign Applications 107105
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA iii
8 .4 . 6 Construction Criteria 108106
8 . 5 Access Points 108106
8 . 5 . 1 Local Roadways 108106
8 . 5 . 2 Collector Roadways 109107
8 . 5 . 3 Arterial Roadways 109107
8 . 5 .4 State Highway and Interstate Systems 109107
8 . 5 . 5 Shared Accesses 109107
8 . 5 . 6 Restricted Movement Access 110108
8 . 5 . 7 Access Control Plans 110108
8 . 6 Access Design 110108
8 . 6 . 1 Geometric Design 110408
8 . 6 . 2 Access Sight Distance 111109
8 . 6 . 3 Subdivision Roads Sight Distance 112110
8 . 7 Auxiliary Turn Lanes 113111
8 . 7 . 1 Auxiliary Lane Length 115113
8 . 7 . 2 Storage Lengths 116444
8 . 7 . 3 Auxiliary Lane Conflicts 117115
8 . 8 Access Construction 117115
8 . 8 . 1 Gravel Requirements 117115
8 . 8 . 2 Pavement Requirements 118416
8 .8 . 3 Access Drainage 118416
8 . 8 .4 Structures 118416
8 . 9 Average Daily Traffic Count 118116
8 . 9 . 1 Vehicle Classification 119117
Chapter 9 Soil Investigation and Pavement Design 122420
9 . 1 Introduction and Purpose 1220
9 . 2 Field Investigation and Soil Samples 1224-2.0
9 . 2 . 1 Testing Frequency 122120
9 . 2 . 2 Sampling Procedures 122120
9 . 3 Subgrade Testing 1229
9 . 3 . 1 Classification 122120
9 . 3 . 2 Swell Test 123121
9 . 3 . 3 pH and Sulfate 123121
9 . 3 .4 Moisture Density 123121
9 . 3 . 5 Hveem Stabilometer 123121
9 .4 Pavement Design Criteria for Onsite Roadways 123121
9 .4 . 1 Design Equivalent Single Axle Loads ( ESAL) 124122
9 .4 . 2 Traffic Growth Rate 124122
9 .4 . 3 Lane Factor 124122
9 . 5 Flexible Pavement Design 125123
9 . 5 . 1 Serviceability and Reliability 125123
9 . 5 . 2 Standard Deviation 125123
9 . 5 . 3 Drainage Factor 125123
9 . 5 .4 Strength Coefficients 126124
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE liv
9 . 5 . 5 Pavement Thickness 126124
9 . 5 . 6 Pavement Design 12612 /I
9 . 6 Material Specification 126124
9 . 6 . 1 General 126124
9 . 6 . 2 Procedure for Material Source Approval 127125
9 . 6 . 3 Hot Mix Asphalt 127125
9 . 6 . 4 Portland Cement Concrete Pavement 128
9 . 6 . 5 Aggregate Base Course 129127
9 . 6 . 6 Aggregate Surface Course ( Gravel ) 130
9 . 7 Soils/Pavement Design Report 13112-9
Chapter 10 Construction Criteria 1331-34
10 . 1 General 133131
10 . 1 . 1 Policy on the Use of Referenced Publications 133131
10 . 1 . 2 Control of Work and Inspection 133131
10 . 1 . 3 Project Acceptance and Warranty 134132
10 . 2 Contractor Responsibilities 134132
10 . 2 . 1 Qualifications, Insurance Requirements, and Licensing 134132
10 . 2 . 2 Pre -Construction Meetings 135133
10 . 2 . 3 Permits 135133
10 . 2 .4 Public and Worker Safety 135133
10 . 2 . 5 Utility Coordination 136134
10 . 2 . 6 Dust Control 1364
10 . 2 . 7 Traffic Control 137135
10 . 2 . 8 Removal of Unacceptable or Unauthorized Work 137135
10 . 2 . 9 Record Drawings and Record Keeping 138
10 . 3 Materials Quality Control and Testing 139137
10 . 3 . 1 Qualifications of Testing Personnel and Laboratories 139137
10 . 3 . 2 Minimum Testing Types and Frequencies 139137
10 . 3 . 3 Material Sources and Sampling 139137
10 . 3 .4 Required Submittals 14013-8
10 . 3 . 5 Soils Reports and Pavement Designs 140448
10 . 3 . 6 Materials Rejection 140438
10 . 4 Excavation and Embankment 141449
10 . 4 . 1 Utility Trenching and Backfill Requirements 141-x-9
10 . 4 . 2 Unsuitable Materials 14113-9
10 . 4 . 3 Moisture and Density Control 141439
10 . 5 Subgrade Construction Methods 142.14O
10 . 5 . 1 Unsuitable Materials 14214O
10 . 5 . 2 Soft Spots 142140
10 . 5 . 3 Moisture and Density Control 142140
10 . 5 .4 Subgrade Proof Rolling 142140
10 . 5 . 5 Treated Subgrades 143141
10 . 6 Base Course Construction Methods 143141
10 . 6 . 1 Gradation and Moisture and Density Control 143141
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I v
10. 6 . 2 Base Course Proof Rolling 144442
10 . 6 . 3 Treated Base Courses 144442-
10 . 6 .4 Acceptance Prior to Paving 145443
10 . 7 Pavement Construction Methods 145143
10. 7 . 1 Pre- Paving Meetings 14543
10 . 7 . 2 Recycled Asphalt Pavement Surfaces 145143
10. 7 . 3 Hot Mix Asphalt Surfaces 145143
10 . 7 .4 Concrete ( PCCP) Surfaces 146444
10.7 .5 Pavement Cut and Patching Requirements 150447
10. 8 Structures and Drainage Features 15044-8
10 . 8 . 1 Bridges 150148
10 .8 . 2 Culvert and Pipe Installation 151448
10. 8 .3 Curbs, Gutters, and 15148
10 . 8 .4 Concrete Structures, Manholes, and Inlets 15149
10 . 8 . 5 Retaining Walls and Slope Stabilization Measures 151149
10 . 9 Other Roadway Features 152149
10. 9 . 1 Pavement Markings 152149
10 . 9 . 2 Traffic Control Devices ( Signs and Signals) 152149
10 . 9 . 3 Trees and Plantings 152150
10.9 .4 Sidewalks and Trails 153150
10. 9 . 5 Guardrails 153150
10 . 9 . 6 Fences 153�5A
10 . 9 .7 Cattle Guards 154151
Chapter 11 Permitting 155462
11 . 1 Transport Permit 155152
11 . 2 Right-of-Way Use Permit 155152
11 . 3 Access Permit 155152
11 .4 Grading Permit 155152
11 . 5 Floodplain Development Permit 156153
Chapter 12 Variance Requests 157 -54
LIST OF FIGURES
Figure 2- 1 Rural Local and Collector Roads ( Unpaved ) ( Interim ) 109
Figure 2-2 Rural Local ( Ultimate ) 1140
Figure 2-3 Rural Collector ( Paved ) 1244
Figure 2-4 Rural Arterial 1342
Figure 2-5 County Highway 1413
Figure 2-6 Urban Local 1544
Figure 2-7 Urban Collector 165
Figure 2 -8 Urban Arterial 174-6
Figure 4- 1 Horizontal Curve 232-2
Figure 4-2 Minimum Tangent from Intersection 242-3
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE ivi
Figure 4- 3 Intersection Cross Slope Detail 2524
Figure 4-4 Horizontal Sight Distance 2726
Figure 4- 5 Crest Vertical Curve 2827
Figure 4- 6 Departure Sight Triangles at Intersection ( Stop Control ) 3029
Figure 4- 7 Typical Intersections 3130
Figure 5 - 1 Weld County Watersheds 3635
Figure 5 - 2 Manning' s n vs . Depth for Low- Flow Section in a Composite Channel 5351
Figure 5- 3 Manning' s n vs . VR for Two- Retardances in Grass- Lines Channels 5452
Figure 5 -4 Riprap Apron Detail for Culverts In Line with the Channel ( USDCM , Vol 2 Figure 9- 34 ) 5957
Figure 5 - 5 Expansion Factor for Circular Conduits ( USDCM , Vol 2 Figure 9 - 35 ) 6058
Figure 5 - 6 Expansion Factor for Rectangular Conduits ( USDCM , Vol 2 Fig 9 - 36 ) 6159
Figure 5 -7 Riprap Erosion Protection at Circular Conduit (Valid for Q/ D2 . 5 < 6 . 0 ) ( USDCM ,
Vol 2 Figure 9 - 38 ) 6260
Figure 5 - 8 Riprap Erosion Protection at Rectangular Conduit Outlet ( Valid for Q/WH1 . 5 < 8 . 0 )
( USDCM , Vol 2 Figure 9 - 39 ) 6361
Figure 5 -9 Water Quality Capture Volume ( WQCV ) Based on BMP Drain Time ( USDCM ,
Vol 3 Fig 3 - 1 ) 6866
Figure 5 - 10 Outlet Structure Plan and Profile Example 7169
Figure 5 - 11 Emergency Spillway Typical Design 7371
Figure 8- 1 Access Approach 111103
Figure 8- 2 Departure Sight Triangles at Access ( Stop Control ) 11210/1
Figure 8- 3 Subdivision Road Sight Distance Triangle 112104
Figure 8 -4 Auxiliary Lanes Layout 113105
Figure 8 - 5 Geometric Components of A Deceleration Lane 114106
Figure 8- 6 Geometric Components of an Acceleration Lane 115107
Figure 8- 7 Tracking Control for Temporary Accesses Error ! Bookmark not defined . 111
Figure 9 - 1 FHWA Vehicle Classification ( CDOT M- E Pavement Design Manual, Figure 3 . 6 ) Error !
Bookmark not defined . 116
LIST OF TABLES
Table 2 - 1 Typical Cross Sections Summary ( Rural ) 7
Table 2 -2 Typical Cross Sections Summary ( Urban ) 98
Table 4- 1 Roadway Design Criteria 2221
Table 4-2 Stopping and Passing Sight Distances and K Values 2726
Table 4-3 Decision Sight Distance 292-8
Table 4-4 Design Frequencies 3332
Table 5 - 1 Runoff Coefficient Equations for Weld County/2008 MHFD ( HSG - a ) 4139
Table 5 - 2 Percentage Impervious Values for Weld County 4240
Table 5 - 3 Runoff Coefficient Equations for Weld County/2007 MHFD ( HSG -A ) 4344
Table 5 -4 Runoff Coefficient Equations for Weld County/2007 MHFD ( HSG - B ) 444-2-
Table 5 - 5 Runoff Coefficient Equations for Weld County/2007 MHFD ( HSG C/ D ) 4543
Table 5 -6 NRCS Conveyance Factor, K 4644
Table 5 -7 Inlets for Weld County 4846
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I vii
Table 5 -8 Theoretical Capacity of Inlets for Weld County 4846
Table 5 -9 Manhole Sizes 4947
Table 5 - 10 Roughness Coefficients ( " n" ) for Channel Design ( After Chow 1959 ) 5250
Table 5 - 11 Trapezoidal Channel Design Guidance/Criteria 5452
Table 5 - 12 Maximum HW/ D Requirements for Weld County 5654
Table 5 - 13 Classification and Gradation of Ordinary Riprap 6462
Table 5 - 14 Drain Time Coefficients for WQCV Calculations 686-6
Table 5 - 15 WQCV Outlets Orifice Plate Perforation Sizing 6967
Table 5 - 16 Non -Jurisdictional vs Jurisdictional Dam Criteria Summary 7673
Table 8 - 1 Updating on Existing TIS 10698
Table 8 -2 Minimum Access Spacing Criteria ( feet ) 108100
Table 8 -3 Access Geometry 110442
Table 8 -4 Auxiliary Lane Requirements 114106
Table 8- 5 Components of Speed Change Lane Lengths for Rural Highways ( R - B ) from State
Highway Access Code 116108
Table 8 -6 Acceleration/ Deceleration Lane and Taper Design Criteria and Redirect Taper for
Through Lanes 116108
Table 8 -7 Grade Adjustment Factors for Acceleration Lanes 116108
Table 8 -8 Auxiliary Lane Storage Lengths 1179
Table 9 - 1 Test Requirement and Frequency 123113
Table 9 -2 Test Requirement and Frequency Error ! Bookmark not defined . 114
Table 9 -3 Equivalence Load Factors ( CDOT Pavement Design Manual, Table H . 2 ) 124117
Table 9 -4 Lane Factors ( Modified from CDOT Pavement Design Manual, Table 3 . 3 ) 124117
Table 9 - 5 Serviceability 125117
Table 9 -6 Reliability Factor 1258
Table 9 -7 Drainage Factor 125-118
Table 9 -8 Strength Coefficient 126119
Table 9 -9 Master Range Table for Hot Mix Asphalt from Table 703 -4 in CDOT' s Standard
Specifications for Road and Bridge Construction 1280
Table 9 - 10 Concrete Aggregate Gradation Table from Table 703 - 1 in CDOT' s Standard
Specifications for Road and Bridge Construction 129121
Table 9 - 11 Aggregate Base Course Requirements 130122
Table 9 - 12 Aggregate Surface Course Requirements 131123
Table 10- 1 Pavement Marking Types on Concrete 147138
LIST OF APPENDICES
Appendix A Weld County Drainage Basin Map
Appendix B Drainage Report Checklist
Appendix C CDOT Operations and Maintenance Plan Guidelines
Appendix D As- Built Drawing Checklist
Appendix E USDCM 2007 Runoff Coefficients
Appendix F Rational Formula - Based Modified FAA Procedure
Appendix G Grading Permit Checklist
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE' viii
Appendix H MS4 Pollution Prevention Plan Checklist and Manual
Appendix I Traffic Impact Study Checklist
Appendix J Weld County Standard Details
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF lix
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WELD COUNTY ENGINEERING&CONSTRUCTION CRITERIA PAGE Ix
CHAPTER 1 GENERAL PROVISIONS
1 . 1 TITLE
This manual is called the Weld County Engineering & Construction Criteria and will be referred to
throughout the text as the WCECC .
1 . 2 PURPOSE AND BACKGROUND
Communities and counties often provide engineering criteria for the repair and construction of
infrastructure, outlining specific " must build " requirements . In Weld County, Colorado, which covers
4, 000 square miles, the range of soil types and site conditions is so varied that it is not practical or
advisable to develop specific requirements . In Weld County, one size does not fit all .
However, recognizing the need in the engineering community for basic information about the County' s
criteria for acceptable infrastructure, the County has developed this document . It outlines design and
material options and guidelines for the design , construction , location , improvement, and maintenance
of infrastructure in Weld County .
The criteria outlined in this manual are intended to provide the designer with guidance to facilitate the
development of infrastructure that is well suited to County needs and is safe, efficient, and economical .
Some cases may arise where conformance to these criteria will be exceptionally difficult . In such cases,
requests for variance to these criteria will be considered on a case - by-case basis . The overriding
requirement is that all improvements must be designed and constructed with professional integrity and
quality at the forefront . Additionally, designs will consider sustainability ( reuse of existing materials
where practical ) and long-term total cost of ownership through life -cycle cost analysis .
143 APPLICABILITY
The WCECC applies to all lot dividers, developers, landowners, and owners of facilities adjacent to or
located in the County' s rights of way or easements — and to the employees, agents, or contractors of
these entities — when they design , construct, and maintain facilities or conduct other activities subject to
review and approval under the provisions of the Weld County Code . The WCECC also applies to the
County and its employees, agents, and contractors .
1 . 4 REFERENCE DOCUMENTS
The WCECC hereby adopts the latest versions of the following documents by reference . However, some
of these references represent nationwide and statewide standards, respectively, which do not always
satisfy County conditions . When standards differ, the instructions and guidance in this manual will
govern .
• American Association of State Highway and Transportation Officials (AASHTO ) A Policy on
Geometric Design of Highways and Streets
• AASHTO Guide for Design of Pavement Structures
• AASHTO Roadside Design Guide
• AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and
Testing
• AASHTO Standard Specifications for Highway Bridges
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 1
• AASHTO Load & Resistance Factor Design (LRFD) Bridge Design Specifications
• AASHTO LRFD Bridge Construction Specifications
• American Society for Testing and Materials ( ASTM ) Annual Book of ASTM Standards
• Colorado Department of Transportation ( CDOT) Access Control Plans
• CDOT Bridge Design Manual
• CDOT Construction Manual
• CDOT Drainage Design Manual
• CDOT Field Materials Manual
• CDOT M& S Standard Plans
• CDOT M- E Pavement Design Manual
• CDOT Roadway Design Guide
• CDOT State Highway Access Code
• CDOT Standard Specifications for Road and Bridge Construction with Weld County Special
Revisions (aka Weld County Department of Public Works Conformed Standard Special Revisions
to CDOT's Standard Specifications for Road and Bridge Construction)
• CDOT Survey Manual
• Colorado Revised Statutes
• Relevant Federal Emergency Management Agency ( FEMA ) documents
• Federal Highway Administration ( FHWA ) Manual on Uniform Traffic Control Devices (MUTCD)
• FHWA Roundabouts : An Informational Guide (NCHRP Report 672)
• FHWA Railroad/Highway Crossing Grade Handbook
• FHWA Real Estate Acquisition Guide for Local Public Agencies ( "The Uniform Act")
• Institute of Transportation Engineers ( ITE ) Trip Generation Manual
• Mile High Flood District ( MHFD ) Urban Storm Drainage Criteria Manual (USDCM)
o MHFD is formerly Urban Drainage and Flood Control District ( UDFCD )
• Transportation Research Board ( TRB ) Highway Capacity Manual
• Weld County Code
• Weld County Transportation Plan
1 . 5 INTERPRETATION
This manual presents the basic criteria that must be met to ensure that infrastructure facilities are safe ,
efficient, economical , and appropriate for use in the County . Where minimum values are stated , greater
values for safety, durability, or functional limits are encouraged whenever practical and consistent with
federal , state , and local requirements . Situations might arise where the application of individual criteria
from the WCECC will not ensure the protection of public health , safety, and welfare . Accordingly, Weld
County may choose not to accept the infrastructure for taxpayer-funded maintenance ; may impose
additional or more stringent criteria than those contained in the WCECC; or may require the
modification of plans, specifications, or operations to protect public health , safety, and welfare .
1 . 6 ROAD ACCEPTANCE
Acceptance of a road for maintenance by the County is at the discretion of the Board of County
Commissioners ( BOCC ) and requires passage of a resolution . The Weld County Road Acceptance Policy
requirements are available in Section 8-6 - 150 of the Weld County Code .
WELD COUNTY ENGINEERING 8z. CONSTRUCTION CRITERIA PAGE 1 2
1 . 7 IMPROVEMENTS AND REIMBURSEMENT AGREEMENTS
Subdivisions, Planned Unit Developments, Final Plats, Uses by Special Review ( USR ) and Access Permits
may require the developer to sign an improvements agreement with the County and provide collateral
to guarantee the improvements are completed as required for one or all the following reasons :
• Off-site public improvements
• Road Maintenance Agreement
• Construction Maintenance Agreement
• Access Improvements Agreement
• On -site improvements for subdivisions/PUDs
development that u c the original developer' s road irnprovements . More information can be found in
Chapter 8, Article II , of the Weld County Code .
An Improvements and Road Maintenance Agreement will detail the approved haul route ( s ) , outline
when offsite improvements will be triggered , and include a maintenance agreement for the haul routes .
Possible mitigations included in the road maintenance agreement may include, but are not limited to,
dust control, specified haul routes, damage repairs, and future improvement triggers . An example
agreement is available at :
https ://www . wel-dgov . comiuserfi-lesiservers/se-rver 6/file/departments/public%20works/developmentr
eviewf usr spr• -
° https ://www . weld . gov/files/sharedassets/ pu
blic/v/ 1/departments/public-works/documents/usr-spr- permits- improvements-agreement-
template . pdf
Weld County uses the Equivalent Single Axle Load ( ESAL) methodology when calculating an
Improvements Agreement proportional share . The ESAL methodology is a national standard for
normalizing traffic counts to reflect the actual damage caused by large vehicles . The ESAL method data
is as follows :
* Add factors & equation .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE' 13
CHAPTER 2 ROAD CLASSIFICATIONS AND TYPICAL SECTIONS
2 . 1 ROAD CLASSIFICATION SYSTEM
The County classifies roadways based on their function and whether they are urban or rural . These two
classifications help designers determine the appropriate design characteristics for the road , including
cross section and geometric standards . The functional classifications and urban/ rural classification
consider anticipated traffic volume and access requirements on a road and determine the minimum
right-of-way required . Together, these classifications help determine the minimum level of service ( LOS ) .
They are a rational , cost-effective basis for the selection of geometric criteria within the range of values
available to the designer .
The BOCC adopts a Road Classification Map by ordinance and reviews it every two years . Changes made
between the two -year reviews typically are based on development reviews and are made on a case - by-
case basis via a public hearing process . The current Weld County Functional Classification Map can be
found on the Public Works Department' s Transportation Planning web page . In addition , the Weld
County Transportation Plan includes recommendations for when to modify road classifications .
2 . 1 . 1 Functional Classifications
Function is determined based on the degree to which a roadway provides access and allows mobility .
Roadways provide access when they allow travelers to easily reach most of the destinations within a
given area . Roadways provide mobility when they allow travelers to easily go longer distances .
The classification of Weld County roads is comprised of a hierarchy of roadways whose functional
classifications are defined by their usage . The relative degree to which a road serves these functions
defines its functional classification . Roads in Weld County are classified as Arterial , Collector, Local , or
Private Roads . The functional classifications of roadways used by Weld County are described below .
2 . 1 . 1 . 1 Arterials
A county highway refers to a highway defined in House Bill 16 - 1155 . In Weld County a county highway is
a four- lane controlled - access arterial road intersecting with an interstate highway, United States
numbered highway, or State Highway . Roads that were annexed before the County' s designation of the
road as a county highway also may be included by intergovernmental agreement ( IGA ) with the
municipality . Weld County has designated Weld County Road 49 ( WCR 49 ) between Interstate 76 ( 1 -76 )
and U . S . Highway 34 ( US 34 ) Weld County Parkway, and Weld County Road 47 ( WCR 47 ) from the
Parkway to State Highway 392 ( SH 392 ) as county highways . See the Weld County Functional
Classification Map, available on the County' s Transportation Planning webpage . The county highway
designation means Weld County will govern all substantive aspects of the road , including access,
maintenance , traffic control , speed limits, and overweight limits, even if municipalities later annex the
road .
Arterials provide good mobility, carrying significant traffic volumes at high speeds for long distances .
They are seldom spaced at closer than one - mile intervals and serve to connect larger communities . The
primary difference between interstate highways and arterials is access . Interstate highways have fully
controlled accesses with no at-grade intersections, while arterials include limited at -grade intersections .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 4
2 . 1 . 1 . 2 Collectors
Collectors link local roads with the arterial road system and connect smaller communities . Both mobility
and access are of equal importance on these roadways . Travel speeds and volumes are moderate, and
distances traveled are short to medium . Traffic on collector roads typically has an origin or destination
within the nearby area . Weld County has both paved and unpaved collector roads .
2 . 1 . 1 . 3 Local Roads
Local roads primarily provide access to adjacent land in rural and urban areas . Local roads are closely
spaced and carry relatively lower traffic volumes for short distances . They generally are internal to — or
serve an access function for — a residence, farm , single neighborhood , or development . Generally, they
should lead traffic to a collector road .
2 . 1 . 1 .4 Privately Maintained Roads
Weld County may review privately maintained roads that are planned to be used by the public, such as a
road within the boundaries of a residential subdivision, but the roads will be maintained by a
homeowner' s association ( HOA ) or other private entity .
2 . 1 . 2 U i bons Primary vs Secondary Classifications
In addition to classifying roads by function, the Weld County classifies roads as
Urban or RuraiPrimary or Secondary per ( C . R . S . ) § 43 - 2 - 101 .
Urban Primary roads usually serve more developed areas and diverse uses ( e . g . , bicyclists, pedestrians,
on -street parking, etc . ) . Urban Primary roads usually are paved , with curbs, gutters, and sidewalks .
Often , they connect to an existing stormwater drainage system rather than making use of roadside
ditches (which are found commonly beside rural roads ) .
Rural Secondary roads primarily serve less developed areas and lower volumes of vehicular traffic .
majority ofMost of the roads in Weld County are classified as ruralsecondary . However, roads that are in
municipal Urban Growth Boundaries may be classified as urban/primary .
2 . 2 RIGHT - OF-WAY WIDTHS
The minimum right-of-way widths are as follows, unless otherwise approved by the BOCC :
Arterial 140 feet
Collector 80 feet
Local 60 feet
2 . 3 RIGHT - OF- WAY USE PERMIT
Permits are required when working within the County road right-of-way . More information can be found
in Section 11 . 2 of this document . See also Weld County Code, Chapter 8, Article XIII , Sec . 8- 13 - 10, et seq .
It is not the intent to allow new private irrigation systems to be located within County road right-of-way .
2 . 4 RIGHT - OF-WAY DETERMINATION
On October 12 , 1889, the BOCC declared all section and township lines on the public domain of the
United States in Weld County to be public highways with the intent of constructing roadways on these
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 15
lines . With this order and for this purpose , the BOCC also established 30 feet of road right-of-way on
each side of the section or township line ( a total of 60 feet ) . Sections not included in the public domain
are railroad sections, school sections ( usually 16 and 36 ) , and sections patented prior to October 12 ,
1889 . Not all County roads are a result of the 1889 Resolution . Many Weld County rights of way have
been conveyed by landowners through road petitions and dedications, as well as Weld County
acquisitions working with landowners .
Due to topography, cost, and other factors, not every Ecounty road is situated within the 60-foot road
right-of-way and /or centered on the section line . In some places, additional right of wayright-of-way has
been acquired or reserved . The ' right-of-way section of
the Public Works web page discusses this in more detail . The County recommends that designers review
this information and also do their own research into right of way in the areas of their projects .
The Weld County right-of-way road files are located in the office of the Clerk to the Board at 1150 O
Street in Greeley, Colorado . Please call ( 970 ) 400-4225 to set up a time to come in .
2 . 5 RIGHT - OF -WAY ACQUISITIONS
Acquisition of road right-of-way will substantially follow the Real Estate Acquisition Guide for Local
Public Agencies published by the FHWA, the Uniform Relocation Assistance and Real Property
Acquisition Policies Act of 1970, 42 United States Code ( U . S . C . ) Ch . 61 ( the " Uniform Act" ) , and Title 38
of the Colorado Revised Statutes ( CRS ) .
2 . 6 TYPICAL CROSS - SECTIONS
While it is important to try to preserve the ultimate road right-of- way, funding availability does not
always allow for construction of the ultimate section and , in such cases, an interim section should be
constructed until funding becomes available .
The Public Works Department determines whether a road is designed to the interim or ultimate ( or
combinations thereof) road cross section . This determination is based on funding, existing and projected
traffic volumes, connectivity, continuity, mobility, and capacity . If only a portion of the ultimate cross
section is being constructed , the interim design will need to allow for eventual widening of the road to
the ultimate cross section . The interim design should ensure that the first phase of the roadway will not
need to be removed to complete the full cross section . Storm drainage designs and floodplain analysis
will be considered and be constructed to accommodate the ultimate section , unless written approval is
obtained from the Public Works Department .
All designs should consider how the roadway is used , long-term traffic predictions, location and density
of nearby development, and topographical characteristics . A roadway constructed to the ultimate cross
section still may require more right-of-way and roadway width in the future for additional lanes,
pedestrian or bicycle facilities, landscaping, utilities, or construction requirements, such as cut or fill
slopes . Designers should try to anticipate such needs . Other chapters within this manual will discuss
design considerations in more detail .
Table 2 - 1 ( Rural Conditions) and Table 2 - 2 ( Urban Conditions ) summarize some of the features
incorporated into the typical cross section drawings for the different road classifications . Figure 2 - 1
through Figure 2 -8 present examples of typical cross section drawings for interim and ultimate roadway
types found in the County . Note that the tables and typical sections in this manual usually reflect
minimum requirements . The Public Works Department may impose additional requirements on a case -
by-case basis .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 6
Table 2-1 Typical Cross Sections Summary ( Rural )
Number of
Roadway Right-of-Way Road Travel Lanes Travel Lane Shoulder Width Median Width Sidewalk
Classification Width ( min . ) Surface ( min . ) Width ( min . ) ( min . )/Type ( min . )/Type Drainage Type Width ( min . )
RURAL ROADS ( INTERIM )
Arterial 140 ft Paved 2 12 ft 6 ft Paved N/A Roadside Ditch N /A
2 ft Gravel
~ ^
Collector 80 ft Paved 2 12 ft 4 ft Paved N/A Roadside Ditch N/A
2 ft Gravel
Collector 80 ft Gravel 2 12 ft 2 ft Gravel N/A Roadside Ditch N/A
( Unpaved )
Local ( Unpaved ) 60 ft Gravel 2 12 ft 2 ft Gravel N/A Roadside Ditch N/A
RURAL ROADS ( ULTIMATE)
County 140 ft Paved 4 12 ft 8 ft Paved 16 ft Roadside Ditch N/A
Highway 2 ft Gravel Paved
Arterial 140 ft Paved 4 12 ft 8 ft Paved 0 ft to 28 ft Roadside/ Median N/A
2 ft Gravel Paved or Ditch or Storm
Unpaved Sewer
Separation
Collector 80 ft Paved 2 12 ft 6 ft Paved 0 ft to 16 ft Roadside Ditch N/A
2 ft Gravel Paved
Local 60 ft Paved 2 12 ft 1 ft Paved N/A Roadside Ditch N/A
1 ft Gravel
Non -maintained 30 ft Unpaved 2 10 ft 2 -- 5 ft Gravel N/A Roadside/Utility Ditch N/A
Local - RAP Culverts need to be
Residential located outside of
ROW on landowner
property
Non - maintained 30 ft Unpaved 2 13 ft 2-2 ft Gravel N/A Ditch swale N/A
Local — Gravel Culverts need to be
Residential located outside of
ROW on landowner
property
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G F, I 7
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 18
Table 2-2 Typical Cross Sections Summary ( Urban )
Number of
Roadway Right-of-Way Road Travel Lanes Travel Lane Shoulder Width Median Width Sidewalk
Classification Width ( min . ) Surface ( min . ) Width ( min . ) ( min . )/Type ( min . )/Type Drainage Type Width ( min . )
URBAN ROADS ( INTERIM )
Arterial 140 ft Paved 2 12 ft 6 ft Paved N/A Roadside Ditch or N/A
2 ft Gravel Storm Sewer
Collector 80 ft Paved 2 12 ft 5 ft Paved N/A Roadside Ditch N/A
1 ft Gravel
Local 60 ft Paved 2 12 ft 1 ft Paved N/A Roadside Ditch N/A
1 ft Gravel
URBAN ROADS ( ULTIMATE )
Arterial 140 ft Paved 4 12 ft 16 ft Paved * 16 ft to 28 ft Paved Curb & Gutter and 10 ft
or Raised Median Storm Sewer
Collector 80 ft Paved 2 12 ft 8 ft Paved * 0 ft to 16 ft Paved Curb & Gutter and 5 ft
Storm Sewer
Local 60 ft Paved 2 12 ft 8 ft Paved * N/A Curb & Gutter and 5 ft
Storm Sewer
* includes gutter pan width
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE I 9
Figure 2-1 Rural Local and Collector Roads ( Unpaved ) (Interim ) .
41
I
R.O.W. (See Note 5)
an 2W
16' -r- 2' 12` Imp 12` ?' 16' f /-
0.
Buffer Shoulder • r Travel Lane Travel Lane N Sh10 er Buffer
Shoulder
Varies I
a I
• ,e1; _ _ N.,- st
\(` I �!!�U—U I " a■ I ii- ;
I
ABC
Compacted Subgradc
INTERIM TYPICAL
CROSS SECTION
Typical Gravel Road
Notes:
1 . * The allowable class and thickness of
Aggregate Base Course (ABC) shall be
determined by the guidelines described
in the Pavement Design Chapter.
2. The foreslopes and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3. All sideslopes shall be seeded and mulched.
4. Additional ROW may be required by Public
Works to meet site specific requirements.
5. Width of ROW shall be determined by
NOT TO SCALE classification of road.
6. Signing per approved plan.
Computer File Information WELD COUNTY
Ovation (Date: 02/1 0/10 Initials: KH PUBLIC WORKS DEPARTMENT INTERIM RURAL LOCAL
, last Modification Date: O4/OK;'16 Initials: dad Wo.& AND COLLECTOR ROADS
Full Path: 'r_�PHSC'\��dmin'!'roposals,«'cldc i l 11 N Sere:Poo (grim Box 758
t 1+ 7 t Greeley, Cukxacb ti063--(i?S$ Revised: ,I
Drum Fik Name: 1F'•r t r 4910) 304-6446 Designer Weld CountyFIGURE,i4 A Fax: 4970) 304-M97 Revised: ' NO. 1
Microstatkm Ver. XM Scale: N.T.S. Units: English rkta:k- K. Hinnenkamp
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 110
Figure 2-2 Rural Local ( Ultimate)
ti
60' 3-o-W-
�-- 2W .+
16' 24' 2' 16'
v
Buffer Shoulder -� Shoulder Buffer
•
I ,' , 12' � .
• `caries ••• ,.f *wpm r
Travel Lane Travel Lane
•
• JIMA
I
2% i 2%
pie - - - -
—.9: 1.01.1" 014.4-, niv,ir.*.rdirtilZailltirtersavegrezinge. . /411
rim r l % i �► I1r %If ll___a �IhI1 I•hCll 11 llrllwlame
ABC Compacted Subgrade
( Class 5)
• HMA — ~�
* ABC ( Class 6) TYPICAL
CROSS SECTION
Notes:
1 . • The allowable class and thickness of Hot
Mix Asphalt (HMA ) and Aggregate Base
Course (ABC) stall be determined by the
guidelines described in the Pavement
Design Chapter.
2. The foreslopes and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3. All sideslopes shall be seeded and mulched.
4. Additional ROW may be required by Public
NOT TO SCALE Works to meet site specific requirements.
5. Signing and striping per approved plan.
Computer File Information WELD COUNTY
(-mast Dab02. 1010 Inrush Kit PUBLIC WORKS DEPARTMENT
RURAL LOCAL
[ AI Mokidics n [bk. 01 . 0 . 12 hauls. K f t knnfThect
Full Per T Pt3S(' :Wnun' Proposals Weldr4t40 I l l l N S •tib•t ott'n, Has '��
Wnlc,.Colorado $OO)2.075% Re.hod Drawn; File `rime ['Iwo 1wn1 it13•M1at+ Nigro- Weld County
r.,• I 470l 1414.44.11 a ' FIGURE NO. 2
%hctua ftkm %n XS' Sale S I S trigs English _ Lktack: K Ninneni►. mp
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 111
Figure 2-3 Rural Collector ( Paved )
SI
I
80' R.O.W.
0.4I 1
I
36'
I
11 67
r V _
r r 22'
H ___ + H_ •
fitttTer Shoulder ; Buffer
Shoulder
Varies 4' ban/ 1 '' I2• 4'
Travel Lane Travel Lane
I
* HMA
2°iu 2%
— Li..I M•�.
a.N E I l E I I , q I . . I I �I I �I pI I , _ - r:� �
Ir."J iiI-it1-11
�
ABC ._ d`
(Class S) Compacted SubgradC
* HMA _ INTERIM TYPICAL _
* ABC (Class 6) -- CROSS SECTION
Shoulder _il
Multi-Use
- 80' R.O.W.
..
►
40'
y 20' 8' ► 4' ... 8' ___ 20' _ .
Buffer nhoulderl Shoulder Buffer
Multi-Use ' Multi-Use
I
mi
Varies _ , 6' 6'
Travel Lane ' Travel Lane
I
* HMA
1g11 I 2°'— ` _ • "L1*+` - _ �` �► �` I��`� .�- J��
r-ir Mr-
(Class El I I IH I I� 113 I IJ I ii I roil 11 ;-_-,-,_,T- r 91../� � ABC'
cit
5) Compacted Suhgradc
* HMA — \ \
* ABC (Class 6) ULTIMATE TYPICAL
CROSS SECTION
Notes:
I . * The allowable class and thickness of Hot
Mix Asphalt (HMA) and Aggregate Base
Course (ABC) shall be determined by the
guidelines described in the Pavement
Design Chapter.
2. The foreslopes and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3. Allisideslopes shall be seeded and mulched.
4. Additional ROW may be required by Public
NOT TO SCALEWorks to meet site specific requirements.
5 . Signing and striping per approved plan.
Computer File information WELD COUNTY
Creation Date: 02r10i 10 hutiats: KH PUBLIC WORKS DEPARTMENT
Last Modification tlatc: olt'U4.� I2 Initials: , RURAL COLLECTOR
Approved:
Fall Pt T:' PBSOAdminTruposes` Weidc _ 1111H Sat-et'Post Oflica Box 758
Cmael ry, coloso 8Ub3.-1 ' SK k r�r �
Drawing Fik Name: r •a f I Phnnt: (970) 304.64% Designer Weld Counts.
Fsa: (970) 304-6447 Revised: FIGURE NO. 3
Microsurin o Ver. XN.1 Scale N.T.S. It: English _ _ Det:11kr: k Hinncnkamp
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 112
Figure 2-4 Rural Arterial
•
41
I
140' ¶tO.W. .,
40' ..
I
4o' 8' 24' 8' so'
�, .,
Buffer I Buffer
Shoulder/ 6' 12' I 12' 6' houlder
`` aries ravel Lane `Travel Lane
1% * YMA 2960
O- ; *. iff
N �...N..„" ABC A Compacted Subgrade A
(Class 5 ) \
• HMA -- ' ABC (Class 6)
INTERIM TYPICAL
CROSS SECTION
it
1
140' ¶to. W.
'1
84' - 96'
e -
a22' - 28' 14' 24' 0' - 28' 24' I �' ... 22' • 281
Buffer Shoulder/ Paved or Unpavec. Shoulder' Buffer
Multi-Use Sepatation Multi-Use
Varies 8' 12' l 2' i 12' 12' 8'.----.4. 1 s _ z _ c _ �Irl�
travel Lane Travel Lane �. I • I 1 • gave/ L,aneesTravel Lane1
*
HMA 2° ,
�� a� ati: 'yrir'a. a—win_ S 'i 1- •c'a tfair: firrJ•e?iT_ :.:.
��i�': �.� fii•L'-/��11�•�i�.1��Ci•7� _ w.�. -� is��S J���J�r' I' 1_ Q
..� •�_.... q HH,•�Ilw-*� / 1 •-�����T������ ��-��� ���� �� ��������� ���������1`��1�{1 �//-"•N�+H-.H«..• s f� iti i� •�
4:1-----
•c , 1� 1) wo... _� a ataN iG/ N2 13Cai lfl � S, 11 7% S� _ )1 __1?_}}�ii1}}�t}�:. 2.7I��tn' ,'1�a11����a'*1- li .IIMA I ' ABC (Class 6) Compacted Subgrade 4: 8
ABC —
ABC '� H ?���:� — (Class 5)
(Class 5)
ULTIMATE TYPICAL
CROSS SECTION
I . * The allowable class and thickness of Hot
Mix Asphalt (HMA) and Aggregate Base
Course (ABC) shall be determined by the
guidelines described in the Pavement
Design Chapter.
2. The foreslope s and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3 . All sideslopes shall be seeded and mulched.
4. Additional ROW may be required by Public
NOT TO SCALE Works to meet site specific requirements.
5 . Signing and striping per approved plan.
Computer File Information WELD COUNTY
crcscaklc 02 19 10 hit KH PUBLIC WORKS DEPARTMENT , RURAL ARTERIAL
Lis' mixbr,Jb,n (talc UI 04 1 , Initial. K I I
1 111 11 Street Offic
e cc Box 75r �plx",�d.
r dl Pit T PBS' Admm Pript,•:tk k% Ale ` Quay. ien Colorado KLIN Olli :•417 is
Rc„xxf
Drasszn¢ f.k Mme Moor197o) to 4.4446 TX-savor, Vs'cfd ( o unl}
ilnn t.mlwt 1a XAI S;ak N 1 S Ina' I.ngli.h Fay tQfi1 t+sy' kc�}a1! /Mika K limn:nkamr FIGURE NO.
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 113
Figure 2-5 County Highway
T.
I
140' R.O.W.
a
I
r.►
2W «.•. 10' __ 24' __ 16' 241 Matw 10' 28� ..
Buffer Shoulder/` Left Turn Lane Shoulder/ Buffer
Multi-Use s 12' w 12' -, I 1T 12' a Multi-Use
K Travel Lane Travel Lane travel Lane Travel Lane 8'
r. ., a
Varies
a .1
* PCC
7r1,,
t gyp '
g.
rectitilla 1.yr r _ti. 7r - •; La 1,.•�.�.r _ L.�•t ti �.' L —~a�r Zile f►'
(���''� �.�. .•—u .• .��U�tl�ll Il�ll��l�������tt tt�tt tt-11. IE. 11-lt�tt�tt�lt����l���l�ll�l/'����.� U. awn—...- •.•. ,�
f �0�r=1iftri 11-11-1FiagagR 1 rifil = lnii l-tl-ll-Ii-tt-n-n-sir-n-n-tt-It-11-11-1i=11=11=11Mg4-1i: - ,, i=ii ii ii=ltil '��
`y * ABC (Class b)
Compacted Subgrade
COUNTY HIGHWAY TYPICAL
CROSS SECTION
:Totes:
I . * The allowable class and thickness of Portland
Cement Concrete (PCC) and Aggregate Base
Course (ABC) shall be determined by the
guidelines described in the Pavement
Design Chapter.
2. The foreslopes and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3. All sideslopes shall be seeded and mulched .
4. Additional ROW may be required by Public
NOT TO SCALE Works to meet site specific requirements.
5. Signing and striping per approved plan.
Computer File Information WELD COUNTY
Creation Date: 02/10/10 Initials: KU PUBLIC WORKS DEPARTMENT COUNTY HIGHWAY
Last Modification Date: 01/04/12 Initials: Kt I 1pQc�ort d
Full Pads T:\PBSC�AdImin\Propusals',weidc t t I t k1 siravPua Office Box 75$
t ,i - % Greeley. Colorado 800241755 Revs:
Phone: (970) 304-6496
NAVINAVIN He Na'ne r P Designer icr Vb cid County
0-M
Fax: (970) 397 ftc, a: oun ' FIGURE NO. 5
M1cco6tathm Yet. XM Scale: N.T.S. Units. English _ - [ktaikr. K. Hinnrnt,amp
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 114
Figure 2-6 Urban Local
Q
I
„� 60' .O.W.
is
2g'
1 we
loni16' J' ' � 24' ?' � 16'
DIN
Butter t Buffer
Shoulder 1 \a Shoulder
Varies l ' 1 2' 1 1 '' I '
ow ~, oak • Travel Lane ~ Travel Lane
' HMMA
2% 1 on4. o
T-- _ smo __.—
*��� , aterat'
'II. i a a �17=Ra^ •• `�
,,.\ 1-11 1Mall,=111=111=111=0— —11-i1_11...11_11.-11—I1�II.3
ABC
(Class 5) Compacted Subgrade
'' HMA-- INTERIM TYPICAL
• ABC (Class 6) —
-
CROSS SECTION
ci
I
„ • 60' R.O.W. .+
I
I
10' 40' 10'
Sidewalk: *sae Sidewalk: Dm
Curb 1 Curb"
Buffer 5' K' 12' 12' x' 5' Butler
Shoulder/ Travel Lane Travel Lane Shoulders
Multi-Use 1 Multi-Use
��• I/ • DMA I `♦���
tit I ?A s.•
2% 2 �o
..../ eva ' +�� ^... . `yam. .1 s� �• -� .� S �7�{ �T��
- IF,1I1. 1 11_'-��',i:Ii ' ah- 11= =11=11=11`~ii=11 1r ---es-
it t
...-
I ' I '
'" ~ Compacted Subgradc
• ABC (Class 6) --&
Notes:
ULTIMATE TYPICAL I • ' The allowable class and thickness of Hot
CROSS SECTION Mix Asphalt OTMA ) and Aggregate Base
Course (ABC) shall be determined by the
5' Minimum Sidewalks as Required by Public Works guidelines described in the Pavement
Design Chapter.
2- The foresiopcs and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3• All sideslopes shall be seeded and mulched.
4- Additional ROW may be required by Public
NOT TO SCALE Works to meet site specific requirements.
5 . Signing and striping per approved plan.
Computer File Information WELD COUNTY
en:2. MR 021010 !Mkt KH PUBLIC WORKS DEPARTMENT
l .asi % MM';akst>bte Ol0412 Irmal. Kli URBAN LOCAL
f Ad
min 11 II trt Street Post oil c Bar 75$ AMrv�.tl.
Fall Path T PAWmin Nei-Jowls' WelWelchMO G reriey. Colorado c i l S n Rohm
Nonni F k stone �� Phooc. eV) tW•r . Weld ( Clint)En rv�t�t ws-t►aa� Rc'ncd G I FIGURE NO.
Mot—tttn.nt 1c: XM St N T S 1 tut. I nglish _ _ lMsJrr K llinncnkamr _
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 115
Figure 2-7 Urban Collector
(11
80' R.O.W. •,,
I
a 36' ss
I
Buffer Shoulder ' Shoulder, mi, ... . 4,.... % -...
Buffer
5' 1 2.' ' 12' 5'
` _
� Travel Lane -,. Tra% el ILane
-�..
Varies i
e -A I
' I (M:A
10 1')
tA• O ' --1
_ • I. .Ti•CAP a Will.....
a e wa ea eat. Marl we e. 1 4
a
�•--. J -^u.�-Zj r �r .rat as. f
•ter _ • . �r _ a .� r. ..n
tri X' c a•\„ig;-11. It;+fl u-wl=11;t1 =Iraileai.-1i'-1T It-11-11.-11
1✓ ABC
(Class 5 ) Compacted Subgrade
• HMA —
-
\ �
* ABC (Class 6) INTERIM TYPICAL __
CROSS SECTION
4_
go* �.o.w.
I
I
I
4hr
• • • w
-- -_
Sidewalk iSidewalk
I
Curb t'urh
I
Buffer 5' fit' 12' 12' $' 5' Buffer
w•-...• maT 1
Shou Shoulder, t••+ Travel l .ant ease iTravel lane Shoulder ~
Multi-Use ► Multi-Use
� `Jr • HMA I N ‘7.
10 2 . I
2•,.
_ _ _ _ _ � /
% sort :ishiNallJeient ewe a,
!loll-lltesitg 11=11sa11=11g c,t-11=11=11=1[-11.-:11#II-#I1:
I
I, • 1
ill r
Compacted Subgradc
• ABC (Clan 6)
ULTIMATE TYPICAL
CROSS SECTION
5' Minimum Sidewalks as Required by Public Works
Notes;
1 . * The allowable class and thickness of l lot
Mix Asphalt (HMA ) and Aggregate Base
Course (ABC) shall be determined by the
guidelines described in the Pavement
Design Chapter.
2. The foreslopes and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3. All sideslopes shall be seeded and mulched.
4. Additional ROW may be required by Public
NOT TO SCALE Works to meet site specific requirements.
5. Signing and sniping per approved plan
Computer File Information WELD COUNTY
Crealtache;; 02. 1010 Suit KH PUBLIC WORKS DEPARTMENT URBAN COLLECTOR
I at %$i(:ow.n l)tc 01 04 12 Whet Kit
F ill Path I PRSC :Wmin 1'rulx�..til% N'rldr 1111 N Siren Pasa Office Eton 73� kPrire‘��
I init Ca nit". (• adu twrt12-4 to Reyna" '
Drasint F k \Ant Pharr Mob sw-6396 noire. Weld Crunty FIGURE NO. 7
1st� WO, 104-449" R! MS,
Vnrc�tu,al 1 a X ti Via?: r .ti IS En GJl _ lku:kr k NinncnLsnq'
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 116
Figure 2-8 Urban Arterial
c
140' R.O.W.
a
40'
i
52' 24' 52'
Osil Si
r Buffer
Buffer Shoulder-/FS'
, ��`\� Shoulder
. Varies �' 12' .+,.. 12' ... 6 .r
Travel Lane - Travel Lane
* HMA
/1 I 2V
._ 1 .. .. -.ar -aa--+a!—'l!"'•11�11^U�II�H—•t\e�\a--ar �..
./
1:-.\`. / llll .-flF11:-h=IIF4IICIL=II=oll_l1._i1�11r511�11�-.11C11#11... :i.��
w/full.. +....�.._ ...- - - ., u .•+ ■f at•ff aat•
4.
C
I �`'� (ClassB5) Compacted Subgrade \ \
* HMA — —* ABC (Class 6) \ \
INTERIM TYPICAL -
CROSS SECTION
C
I 140' R.O. .
.,
16' - 22' 16' 24' 16' - 28' 24' 16' 16' - 22'
Sicewa , Shoulder/ Raised Median Shoulder/ Sidewalk/
Curb/ Multi-Use 12' 12' t 12' IT „ Multi-Use Curb/
Buffer Travel Lane Travel Lane i 'Travel Lane Travel Lane Buffer
.. 10' I * HM iQ'
a
I26
2 . I
��,f1affa _r'-l\t�� r �t�.1f.� f►t!: • .Nl �^�tY.� .y l` fw r /�
— ..�.1���'� /,11i1.���a:f.1a�. w �� t - s•.\ Ii►1a� ��.e ... ,•'I:�I.r.+...
��. ..•—.aa.^.1 /1 /Jwf/wll��l. ,,. .,,����L�wtlwtt���t��ri 1��� ��rlf��t��t�w�w' �!�1��1,�1�w1,�11 f� ll. lf. a^•�—�• ...
-u u ri-Intl= �-n rr-t1=ITS- - = - - = - - - - = ti = - -
t„1r�:�r �r_r1-+Ilr;rll;;n: .:�f-1r-,1r.-1r...n...11...rr.r �. -- - --�_1r�lr::.rr_n�rr_ri..111 .a�-1f:-Ir-1� n;.n;;al.;;ncilrlr��'h
V * ABC (Class 6) , I
ULTIMATE TYPICAL Compacted Subgrade
CROSS SECTION
JO' Minimum Sidewalks as Required by Public Works
Notes:
1 . * The allowable class and thickness of Hot
Mix Asphalt (HMA) and Aggregate Base
Course (ABC) shall be determined by the
guidelines described in the Pavement
Design Chapter.
2. The foreslopes and backslopes shall be
no steeper than 4: 1 with a preference of
6: 1 or flatter where it can be accommodated.
3. All sideslopes shall be seeded and mulched.
4. Additional ROW may be required by Public
NOT TO SCALE Works to meet site specific requirements.
5. Signing and striping per approved plan.
Computer File Information WELD COUNTY
Creation Date: 02)10;10 initials: Kit i PUBLIC WORKS DEPARTMENT
URBAN ARTERIAL
Last MiodifcatioaDate: 0i(O1112 Initials: 1(11
full Path: T:\.PBSC�.Admin\Proposals\.Wcldc
Vatit' I I l t H Strew Post Office Box 758 A xut '
Cowley, Colorado 80632-0758 Rnt5cd:
Draw mg File Name: Phone: t970) 304 l>t9ri Denim: Weld County
En: (970) 30441497 lic't4cd: FIGURE NO. 8
Micw uititla Ver. XM Scale: N.T.S. Units. English _ Detmkr. K. Hinnenkarnp
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 117
CHAPTER 3 SURVEYING
3 . 1 SURVEY DATA - REQUIRE A SURVEY CONTROL SHEET
The required horizontal datum for surveying in Weld County is North American Datum of 1983 , NAD -83 .
The required vertical datum is North American Vertical Datum of 1988, NAVD-88 .
3 . 2 STATE PLANE
It is requiredcommend-cd that survey control be tied into a National Geodetic Survey ( NGS ) monument
for state plane conversion . Please refer to the NGS website for monument information and location .
3 . 3 MONUMENT BOXES
Monument boxes are available at no charge for surveyors with valid permits who are upgrading aliquot
corners on paved Weld County Roads or placing monumentation for aliquot corners on new paved Weld
County Roads . Please contact Public Works in advance at ( 970 ) 400-3750 .
3 . 4 ROAD SAFETY
Appropriate traffic control devices and safety equipment are required when surveying within the County
right-of-way .
For the safety of the traveling public, monument box covers must be replaced , or the holes created must
be backfilled . To minimize damage to the asphalt, concrete collars will be required around newly
installed monument boxes .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGL 118
CHAPTER 4 ROADWAY DESIGN CRITERIA
4. 1 GENERAL
4. 1 . 1 Policy on the Use of Referenced Publications
This chapter summarizes and /or supplements standards that have been prepared by AASHTO . The
County expects and recommends that transportation designers reference the most recent edition of
AASHTO' s A Policy on Geometric Design of Highways and Streets as a primary guide when designing
roadways in the County . Designers also are expected to reference CDOT design manuals . However,
AASHTO and CDOT policies represent nationwide and statewide standards, respectively, which do not
always satisfy County conditions . When standards differ, the instructions and guidance in this manual
will govern .
For the design of auxiliary turn lanes, please see Chapter 8 of this document . All traffic control devices
and road striping will be in accordance with the latest version of the MUTCD or as shown in the latest
version of CDOT' s M& S Standard Plans .
4. 1 . 2 Typical Plan Set Guidelines
Typical plan sets should include enough detail and documentation to allow successful construction of
the proposed transportation improvements . Plan sets found to be incomplete, or of insufficient quality
to be easily readable by the reviewer( s ), will be rejected by the Public Works Department . Plan sets will
be produced on 11 - inch x 17- inch paper and may be submitted electronically . All plan sets will be
prepared by or under the direct supervision of a Professional Engineer licensed in the state of Colorado .
Each sheet will be stamped and signed by the Professional Engineer of record . The following elements
also must be included :
• Cover Sheet . Must include a vicinity map with scale and north arrow, an index of sheets, design
data , the phone number and address of the company and/or engineer responsible for the
drawings, a utility contact list with phone numbers and email addresses, the Utility Notification
Center of Colorado ( UNCC ) phone number ( 811 ) , the project title , and the date printed .
• M &S Standards Sheet . Must show which M &S standards from the most recent CDOT M& S
Standard Plans are applicable to the project .
• Typical Section Sheet(s ) . Must include functional classification of the roadway, rural or urban
classification of the roadway, right-of-way width , lane and shoulder widths, road centerline
( crown ) location , typical cross-slope, and pavement structural section elements and thicknesses .
• General Notes . Must include all notes that are applicable to the construction of the project . May
also include notes on pavement design , Best Management Practice ( BMP ) design , etc .
• Summary of Approximate Quantities and Earthwork Quantities Sheet(s ) . Must include tables
showing the bid tabulation quantities and breakdowns of all quantities by location .
• Survey Control Sheet(s) . Must include the basis of elevation control , basis of bearings, and
project coordinates datum .
• Right-of-Way Plan Sheet(s) . Must be included when temporary or permanent easements are
needed or right-of-way will be acquired . Must include scale and north arrow, existing right-of-
way lines, parcel lines and data , ownership information , proposed easement or right-of-way
lines, and existing and proposed improvements .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 119
• Utility Plans Sheet(s) . Provide existing ( SUE ) and proposed utility relocations . Both plan sets
Mmust include scale and north arrow, utility ownerships, utility locations, utility conflicts . The
SUE sheets shall provide the , and _appropriate level of mapping meeting Colorado state
legislative subsurface utility engineering ( SUE ) requirements . County requires Quality Level B or
better for all utility impacts . The utility plan should also show the location of where utilities are
proposed to relocate .
• Demolition and Removal Sheet(s ) . Must show existing conditions and include all items that are
to be removed or demolished by the contractor as part of the project .
• Plan and Profile Sheet(s) . Must include horizontal and vertical scales and north arrow, location
of right-of-way, location of easements, location of property lines, location of utilities, centerline
stationing, horizontal and vertical curve information , existing and finished road grades, and
design elevations . Separate plan and profiles sheets will be included for each access point,
irrigation structures, and other structures as applicable .
• Intersection Detail Sheet(s) . Must include roadway centerline with stationing, north arrow,
horizontal scale ( 1 inch = 20 feet preferred ) , proposed and existing contours ( 1 foot minimum ) ,
grade flow arrows, location of right-of-way, curb type label ( if applicable ), and critical spot
elevations .
• Grading and Erosion Control Sheet(s ) . Must include existing and final elevation contours at a
minimum of one -foot contour interval , spot elevations at critical drainage points to facilitate
review and construction, slope/flow arrows and labels, limits of construction disturbance, and
location of permanent erosion control features . If the project requires a Stormwater Permit per
the National Pollutant Discharge Elimination System ( NPDES ) , a detailed stormwater
management plan ' SWMP ) and landscaping/vegetation plan will be required . ( Additional
information can be found in Chapter 6 of this document . )
• Drainage Sheet(s) . Must include location and type of all drainage features ( e . g . , pipes, ditches,
inlets, manholes ) , details for pond spillways and outlet structures, plan and profile views of all
pipes and culverts ( unless new pipes or culverts are replacing existing ones of the same size and
at the same location ) , location of all existing utilities, utility potholing, identification of utilities
that conflict with new drainage features, and construction details . Labeling is required for any
pond water surface elevations ( WSEL ) , volumes, water quality capture volumes ( WQCV ) , and
elevations . Drainage sheets must correspond to the accepted drainage report .
• Signage and Striping Plan Sheet(s ) . Must include driving lane and shoulder widths; stationing
locations for striping beginnings, endings, and changes; color and size of striping; striping
material type ; stationing location for signs; type and size of signs; and quantities tabulation
tables .
• Landscaping Plan Sheet(s) . Must include all areas that are to be seeded and/or landscaped . If
trees are to be replaced , they must be shown on this plan subset .
• Phasing Plan Sheet(s) . If the project is to be phased , the phasing plans must be included .
• Construction Traffic Control Plan Sheet(s) . Must include plan view of all existing roads within
the limits of the detour or within one mile of the project, whichever is larger; type and size of
signs or other traffic control features; locations for all traffic control features; and quantities
tabulation table . These sheets also must show any anticipated detour routes for road closures
during construction .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 120
• Cross Section Sheet(s) . Cross sections on 50-foot interval must include depiction of existing and
final ground elevations, location of existing and proposed right-of-way and easement lines,
utilities, station labeling, and roadway centerline location .
• Stormwater Management Plan . Must determine whether site is located in a Municipal Separate
Storm Sewer System ( MS4 ) area and must be included for temporary and permanent control
measuresconditions. See Chapter 6 of this document for more information .
These guidelines are not intended to replace specific guidelines related to preparation and submission
of plat maps and property description maps prepared by a licensed professional surveyor. These
guidelines also are not inclusive of all the specific items that may be required by the Weld County Public
Works, Planning or Building Departments . There may be additional requirements for more complex
projects, such as bridge replacement and County Highway projects .
Table 4- 1 below summarizes the roadway design criteria that can be found in this document for each
roadway classification . For additional details refer to the sections below that discuss each topic .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PACP 121
Table 4-1 Roadway Design Criteria
Design Element Arterial Collector Local
Design Speed
Within Subdivisions 60 mph 50 mph 40 mph
Outside Subdivisions See Note 1
Posted Speed
Within Subdivisions 50 mph 40 mph 30 mph
Outside Subdivisions See Note 1
Design Vehicle WB-67 s WB-67 WB-67
Maximum Superelevation
Rural 6% 6% 6%
Urban 4% 4% 4%
Minimum Tangent Between Curves in Addition to Superelevation Transition
Length Required 100 ft 100 ft 50 ft
Minimum Intersection Tangent ( Measured from Pavement Edge ) ( See Note 2 ) 200 ft s 150 ft 100 ft
Minimum Centerline Radius See Note 3
Minimum K Value for Vertical Curves See Note 4
Minimum Stopping Sight Distance See Note 4
Minimum Centerline Grade on Road with Curb and Gutter 0 . 40% 0 . 40% 0 . 40%
Maximum Centerline Grade 5 % 6% 8%
Maximum Vertical Grade Change Not Requiring a Vertical Curve ≤0 . 2 % ≤0 . 2 % ≤0 . 2%
Minimum length for Vertical Curves
Preferred : 300 ft 300 ft 300 ft
Allowed ( 3 x Design Speed ) : 180 ft 150 ft 120 ft
Notes:
1 . See Section 4. 1 . 3 to determine an appropriate design speed and posted speed limit. Enforceable speed limit for roads
without a posted speed limit is 55 mph.
2. See Figure 4-2Figure 4 2.
3. See AASHTO 's A Policy on Geometric Design of Highways and Streets superelevation tables for minimum radii based on
design speed and maximum superelevation.
4. See Table 4-2 Table 4 2 for minimum stopping sight distance and K values for vertical curves.
4 . 1 . 3 Design Speed
Weld County requires designers to use a design speed that is 10 miles per hour ( mph ) above the
required posted speed limit . Any change to the existing posted speed limit on a County road requires
review by the Public Works Department and approval by the BOCC .
To determine an appropriate speed limit, traffic investigations should consider the following factors
applicable to the portion of road being studied :
• Vehicle speed data ( 85th percentile )
• Crash history
• Hazardous locations ( curves, sight distance, etc . )
• Parking practices
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 122
• Roadside development
• Road characteristics
The enforceable speed limit on roads within the County ( not including roads within a subdivision ) is 55
mph unless posted otherwise or within business districts, residential areas, or other areas where special
conditions require a lower speed limit . Section 42 -4- 1102 of the Colorado Revised Statutes requires that
speed limits not be higher or lower than the basic prima facie ( reasonable and prudent under normal
conditions) speed limit unless a traffic investigation has justified the change .
Posted speed limits for roads within subdivisions shall be as follows :
• 50 mph for arterial roads;
• 40 mph for collector roads;
• 30 - 40 mph for local commercial/ industrial uses; and
• 25 — 30 mph for local residential uses .
4. 2 HORIZONTAL ALIGNMENT
4. 2 . 1 Horizontal Curves
Horizontal alignment of the roadway is critical for safe and economical operation of motor vehicles
traveling the roadway at the design speed . Horizontal curve design should be based on an appropriate
relationship between design speed , right-of-way, profile grades, and construction costs — and on their
joint relationships with superelevation and side friction . Curves are not required when the deflection
angle ( A ) (total central angle of the circular curve ) is less than 1 degree . Curves should be at least
500 feet long for a deflection angle of 5 degrees, and the minimum length should be increased 100 feet
for each 1 degree decrease increase in the deflection angle . Figure 4- 1 illustrates a simple horizontal
curve .
Figure 4-1 Horizontal Curve
Point of Intersection ( PI )
T Deflection Angle (A)
Tangent
'External Distance (E)
Length of Curve ( L) •
Point of Tangency ( PT)
Point of Curvature (PC )
Simple Curve
The formulas can be found in AASHTO' s A Policy on Geometric Design of Highways and Streets and
CDOT' s M&S Standard Plans . Minimum radius values may also be taken from the AASHTO
superelevation tables, using the " NC" ( normal crown ) line item . For rural areas, use the AASHTO table
for minimum radii normal crown rates with emax = 6 percent . For urban areas, use the AASHTO table for
minimum radii for normal crown rates with emax = 4 percent .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 123
Designers should use every effort to exceed the minimum curve radius recommended by AASHTO when
practical . Simple curves should be used for all roadways . Broken back, compound , or reverse curves are
not recommended . The tangent between curves should be sufficient to accomplish the superelevation
transitions required for adjacent curves . An additional 50 feet to 100 feet of tangent length , graded as a
normal crown , should be provided between the end of the transition out of one curve and the beginning
transition into the next for ease of driving .
Minimum intersection tangents ( measured from the pavement edge of the intersected road at
intersections ) shall be as follows : 200 feet for arterial roadways; 150 feet for collector roadways; and
100 feet for local roadways as illustrated in Figure 4-2 .
Figure 4-2 Minimum Tangent from Intersection
MINIMUM TANGENT FROM INTERSECTION
WELD COUNTY ROAD
EDGE OF PAVEMENT
POINT OF CURVATURE ( PC)
4 . 2 . 2 Superelevation
Proper design of horizontal curves often requires the use of superelevation ( roadway banking ) . Factors
controlling the use of superelevation include climate conditions, terrain conditions, classification of the
road , and the frequency of slow- moving vehicles on the roadway . In general , a lower rate of
superelevation is used in urban areas than in rural areas . For rural areas, use the AASHTO table for
minimum radii for design superelevation rates with emaX = 6 percent . For urban areas, use the AASHTO
table for minimum radii for design superelevation rates with emaX = 4 percent . If possible, superelevation
rates of 4 percent or less should be used in roadway designs .
4. 2 . 3 Transitions
The superelevation transition section consists of the superelevation runoff and tangent runout sections .
The superelevation runoff is the length of roadway needed to accomplish a change in outside lane cross
slope from zero to full superelevation , or vice versa . The tangent runout section is the length of roadway
needed to accomplish a change in outside lane cross slope from normal cross slope rate to zero , or vice
versa . Additional information pertaining to the lengths and use of transitions for simple and spiral curves
can be found in AASHTO' s A Policy on Geometric Design of Highways and Streets and CDOT' s M&S
Standard Plans . The design should allow for 60 percent of the superelevation transition length to occur
before the horizontal curve starts and after it ends . The remaining 40 percent of the transition occurs
within the horizontal curve . This includes the lengths for all the transitions including normal crown , level
crown , reverse crown and full superelevation .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 24
4.2 .4 Cross Slope
Cross slope is necessary to ensure adequate roadway drainage . The paved typical cross sections
( described in Chapter 2 of this document ) all show a cross slope of 2 percent, and this is the County' s
preferred value for a paved roadway . Non - paved roadways should have a cross slope closer to 3 to 4
percent to help accommodate surface drainage . Undivided roads should have a normal crown that is a
two -way cross slope, with the high point of the cross section located on the road centerline . Divided
roads should have a cross slope on each side of the divide, with the high point of each section located
where the pavement meets the median .
Unusual conditions and transition areas may cause the 2 - percent cross slope requirement to vary . Cross
slopes varying from a minimum of 1 percent to a maximum of 4 percent may be allowed depending
upon surface type . Intersections of roads with curbs and gutters sometimes require the use of crosspans
for drainage . At these areas, the normal two -way 2 - percent cross slope will transition to a one -way
slope adjacent to the cross pan , with a slope range of 1 percent to 3 percent . For intersections not
requiring cross pans, see Figure 4- 3 for the desired cross slope configuration .
Figure 4-3 Intersection Cross Slope Detail
ti.�,_,__�_..-' Maintain positive drainage
UNCONTROLLED ��``�
INTERSECTION - - 1 from centerpoint of intersection CONTROLLED
.. •''"sty: to all quadrants. INTERSECTION
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39,111_-11,:11). t .-55551_,A)).;.;) • r •«_ _-•s..•� • •( k1i
en
" � a -' ` Through road retains crown;
Eliminate crown from all �' c.---- �• side roads with stop/yield signs
directions approaching �-;' are shaped to match the edge
r rr_•-a•�1 r
:r'•; the intersection, of through road.
The rate of change for cross slope in an area of transition , should not exceed 1 . 5 inches over a 50-foot
horizontal distance . This rate helps to ensure ride quality for the traveling public .
4 . 3 VERTICAL ALIGNMENT
Weld County' s topography generally is flat with gentle slopes, but some areas have steep drainage
basins and rolling hills . When designing roadway vertical alignment, designers must consider stopping
sight distance requirements for the given speed limit and the challenges of large cut-and -fill sections .
Vertical curves are classified as either sag or crest curves . Typically, sag curves are controlled by
nighttime driving conditions with headlight visibility restrictions, and crest curves are controlled by
stopping sight distances . Vertical curves should be simple in application and should result in a design
that is safe and comfortable in operation , aesthetically pleasing, and adequate for drainage — especially
when a curb and gutter are used .
4. 3 . 1 Maximum and Minimum Grades
Grade lines typically are controlled by topography and structure clearances, but very flat grade can be
controlled by drainage considerations . Other factors that should be considered are road classifications,
design speed , safety, and construction costs .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 125
A minimum grade value of 0 . 4 percent is preferred for road sections with curbs and gutters . In certain
conditions, a grade as low as 0 . 3 percent may be used with approval of the Department of Public Works .
The designer must consider the ultimate design of the roadway, however, recognizing if a curb and
gutter may be required in the future , and then design for those conditions during the interim design .
Maximum allowable grades are as identified in Table 4- 1Table 4 1 above ; 5 percent on arterials, 6
percent on collectors, and 8 percent on local roads . Grades of 4 percent or steeper will require special
consideration for drainage or erosion protection .
When using combinations of horizontal and vertical curves, it is important to recognize the driver' s
perspective . Sharp horizontal curvature should not be introduced at or near the top of a pronounced
crest vertical curve . If unavoidable , the horizontal curve should be made longer than the vertical curve
to help minimize the driver' s inability to perceive the horizontal change , especially at night . For further
details, see AASHTO ' s A Policy on Geometric Design of Highways and Streets and CDOT' s Roadway
Design Guide .
The length of vertical curves can be determined by dividing the rate of vertical curvature by the grade
change or algebraic difference in intersecting grades ( % ) .
L ( Length ) (ft ) = K ( rate of curvature ) / A ( grade change ) ( % )
A vertical curve is not required when a grade change or the algebraic difference is ≤ 0 . 2 percent . The
Weld County preferred minimum length of a vertical curve is 300 feet . The allowed minimum is three
times the roadway design speed .
4.4 SIGHT DISTANCE
At intersections, accesses, and points along County roadways, sight distance is essential to protect the
traveling public . In evaluating the overall performance of a roadway, there are several sight distances to
consider when designing a roadway . When items such as walls, buildings, bridge piers, cut slopes, or
vegetation growth are near the roadway on the inside of a curve, they can block a driver' s view of the
road ahead . If they are too close, the driver will not have sufficient distance along the curved roadway to
stop when a hazardous condition comes into view . Sight distance related to accesses is discussed in
Chapter 8 of this document .
4.4. 1 Stopping Sight Distance
Stopping sight distance is the length of roadway it takes for a driver to bring a vehicle to a complete
stop . Stopping sight distance is measured from the driver' s point of view, which , according to AASHTO ' s
A Policy on Geometric Design of Highways and Streets, is 3 . 5 feet above the road surface, to an object' s
height of 2 feet within the roadway . Stopping sight distance includes the reaction time of the driver and
braking distance of the vehicle, as well as roadway grades ( see Table 4-2 ) . Additional information
regarding reaction time and braking distance can be found in AASHTO ' s A Policy on Geometric Design of
Highways and Streets and in Chapter 8 of this document .
As shown in Table 4-2 , stopping sight distance varies depending on the percent in grade up or down
within the vertical curve . The designer should account for the varying grades within his or her profile
design and select the appropriate values of stopping sight distance .
Table 4-2 lists stopping and passing sight distances for various percent grades up or down .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 126
Table 4-2 Stopping and Passing Sight Distances and K Values
Design Stopping Sight Distance (feet ) Passing Sight Distance
Speed No % Down Grade % Up Grade Crest Sag Crest Curve
( mph ) Grade
(0) 3 6 9 3 6 9 K K (feet) K
25 155 158 165 173 147 143 140 12 26 450 72
30 200 205 215 227 200 184 179 19 37 500 89
35 250 257 271 287 237 229 222 29 49 550 108
40 305 315 333 354 289 278 269 44 64 600 129
45 360 378 400 427 344 331 320 61 79 700 175
50 425 446 474 507 405 388 375 84 96 800 229
55 495 520 553 593 469 450 433 114 115 900 289
60 570 598 638 686 538 515 495 151 136 1, 000 357
65 645 682 728 785 612 584 561 193 157 1, 100 432
For horizontal curves ( see Figure 4-4 ) , the sight line is measured along the chord of the curve , while the
stopping sight distance is measured along the centerline of the inside lane around the curve .
Figure 4-4 Horizontal Sight Distance
Sight Distance
Highway CI_ --
Lane CL _ -- - - - - - -- _ �..
_ -
.r - ., .. HSO ` ` .. a --ft.
• ♦ . �
.- �► � I
Line of Sight
sight Obstruction
*al
o
of
are
ca
HSO = R ( 1-cos ( 28 . 65S/ R ) ) or
S = R/ 28. 65 acos ( ( R- HSO )/ R )
HSO = Horizontal Sightline Offset
S = Stopping Sight Distance
R = Radius of lane centerline
Horizontal sight distance may be restricted by obstacles along the roadway or even by cut slopes
through a hillside . Other normal roadside objects, such as guardrail , concrete barriers, and privacy
fences, should be studied for interference with sight distance .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 127
Vertical sight distance is determined by the geometrics of the curve . Figure 4-5 is an example of the
crest vertical curve .
Figure 4-5 Crest Vertical Curve
Sight Distance (S) -J
3.5 ft r
2ft —i _
Length of Curve ( 1 )
Sag vertical curves usually are controlled by headlight distance . Under certain conditions, the minimum
stopping sight distance values used for design exceed the length of visible roadway . This is because of
the limitations of vehicle headlights, especially low- beam headlights .
Formulas to determine stopping sight distance on both crest and sag curves can be found in AASHTO' s A
Policy on Geometric Design of Highways and Streets .
4.4. 2 Passing Sight Distance
Passing sight distance is the length of roadway required for the driver of a vehicle to pass another
vehicle safely and comfortably, without interfering with the speed of an oncoming vehicle traveling at
the design speed if it came into view after the passing maneuver was started . Passing sight distance is
measured from the driver' s point of view, which is to be measured at 3 . 5 feet above the road surface, to
an object' s height of 3 . 5 feet . Typically, passing sight distance will be limited on crest vertical hills . A
significant amount of cut may be required to achieve adequate passing sight distance . Table 4- 2 lists
appropriate passing sight distances for various speeds .
4.4 . 3 Decision Sight Distance
The stopping sight distances shown in Table 4- 2 are distances for reasonable and alert drivers to come
to a complete stop . They do not include the time it takes drivers to make a decision when unexpected or
unusual maneuvers are required . Decision sight distances ( see Table 4- 3 ) are substantially greater than
stopping sight distances . Locations where these kinds of decisions are required include interchanges,
cluttered or confusing intersections, and short lane drops . ( See AASHTO A Policy on Geometric Design of
Highways and Streets for more information . )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 128
Table 4-3 Decision Sight Distance
Decision Sight Distance
Decision Sight Distance for Avoidance Maneuver (ft)
Design Speed ( mph )
A B C D E
30 or less 220 490 450 535 620
40 330 690 600 715 825
50 465 910 750 890 1 , 030
60 610 1, 150 990 1, 125 1, 280
70 780 1,410 1, 105 1, 275 1, 445
Where:
Avoidance Maneuver A = stop on rural road (t = 3. 0 seconds) Avoidance Maneuver B = stop on urban road (t = 9. 1 seconds)
Avoidance Maneuver C = speed/path/direction change on rural road (t = 10. 2 sec to 11 . 2 sec)
Avoidance Maneuver D = speed/path/direction change on suburban road (t = 12. 1 sec to 12. 9 sec)
Avoidance Maneuver E = speed/path/direction change on urban road (t = 14. 0 sec to 14. 5 sec)
4.4.4 Intersection Sight Distance
There are numerous intersections within Weld County ; most are controlled , but some are uncontrolled ,
which means there is no signing in either direction . Ideally, intersections would have adequate sight
distance in all directions and along approaches to allow drivers to see obstructions or approaching
vehicles . However, many of the County intersections do not have unobstructed views for various
reasons . Utility appurtenances, embankments, vegetation , and privacy fences are just a few examples of
sight restrictions . In these circumstances, and where no traffic control devices are present, the basic rule
of the road is the vehicle on the left is to yield to the vehicle on the right if they arrive at about the same
time . If drivers cannot see due to sight obstructions at the intersection , it is the responsibility of every
driver to slow down and determine if it is safe to continue through the intersection . Additional
information regarding intersection sight distance can be found in AASHTO' s A Policy on Geometric
Design of Highways and Streets .
The recommended dimensions of the sight triangles vary with the type of control used at the
intersection because different types of control impose different constraints on drivers and , therefore ,
result in different behavior. AASHTO ' s A Policy on Geometric Design of Highways and Streets presents
procedures to determined sight distances at intersections for the following types of traffic control :
1 . Intersections with no control
2 . Intersections with stop control on the minor road
3 . Intersections with yield control on the minor road
4 . Intersections with traffic signal control
5 . Intersections with all -way stop control
6 . Left turns from the major road
7 . Roundabouts
Figure 4- 6 below, illustrates an intersection with stop control on the minor road . For information
regarding the variable definitions and equations used to calculate these distances, see Section 8 . 6 . 2 of
this document and AASHTO ' s A Policy on Geometric Design of Highways and Streets.
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 29
Figure 4-6 Departure Sight Triangles at Intersection (Stop Control )
cts
I I o 0
cc I--
cc
Owl
+
O
I I
Major Road Major Road , I
r I I
�--�� a
Clear Sight Triangle
Clear Sight Triangle - - - - - - g g
Decision Point
Decision Point
Departure Sight Triangle for Viewing Traffic Departure Sight Triangle for Viewing Traffic
Approaching the Minor Road from the Left Approaching the Minor Road from the Right
Private accesses need to take into consideration these sight distance requirements just as other
roadways would . More information regarding access sight distance can be found in Chapter 8 of this
document .
4. 5 INTERSECTIONS
By definition , an intersection is the location where two or more roadways meet or join together. This
occurs at at-grade crossings, interchanges, or grade separations without ramps . All of the County-owned
intersections in Weld County are at-grade intersections .
Generally, there is more potential for conflict at intersections than on straight sections of roadway, so
intersections usually have higher accident rates . Chapter 9 of AASHTO ' s A Policy on Geometric Design of
Highways and Streets discusses intersections and provides guidance on design details . Designers also
should refer to CDOT' s Roadway Design Guide . The sections below highlight a few key aspects of
intersection design . See also Chapter 2 of this document for typical cross-section drawings .
4. 5 . 1 Alignment and Profile
It is very important for the success and safety of any intersection that it is aligned with the intersecting
roadway . For standard , at-grade , four-way intersections and T- intersections, the roadways should meet
as close to perpendicular as possible . Skewed intersections are difficult for drivers and create unsafe
conditions . The required angle between centerlines of the intersecting roadways is 90 degrees, as shown
in Figure 4-7 . Any deviations from 90 degrees will need to be approved by the Department of Public
Works .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u E 30
Figure 4-7 Typical Intersections
I
90 Degrees l
Rdwy CL
-_ MIN-
Rdwy CL
/
90 Degrees 90 Degrees
I I
I
Four-Way Intersection T Intersection
The alignments and grades of the intersecting roadways should permit the maneuvers needed for cars
to pass through the intersection with minimal interference . Alignments should be as straight and flat as
practical , and substantial grade changes should be avoided .
All lanes shall be in general alignment through each intersection ; however, a maximum 2 -foot shift is
allowed across an intersection without a variance approval by the County Engineer .
The profile grade lines should be adjusted back a distance from the intersection to provide a smooth
transition . It may be desirable to remove the cross slopes coming into the intersection , as steep cross
slopes or grade changes create an undesirable bump at the intersection and may require reconstruction
to correct . Refer back Figure 4-3 for an intersection cross slope detail . A smooth transition is particularly
important at intersections where drivers do not reduce their speed or come to a stop . Designers should
remember that intersections which are currently stop- controlled may not be stop-controlled in the
future .
4. 5 .2 Corner Radii
Corner radii are another critical aspect of intersection design . Corner radii are selected based on the
turning radii of different design vehicles . Chapter 2 of AASHTO' s A Policy on Geometric Design of
Highways and Streets discusses design vehicles and their different turning radii . The four classes of
design vehicles are : passenger cars, buses, trucks, and recreational vehicles . The Weld County design
vehicle is the WB-67 truck .
4. 5 . 3 Approval Requirements
Chapter 9 of AASHTO ' s A Policy on Geometric Design of Highways and Streets summarizes the minimum
edge of traveled way design for the four classes of design vehicles . Usually, the simplest curves to
construct are the simple curve with taper and the three -centered compound ( symmetric ) radii . Other
compound curves can be difficult to implement in the field . For intersections on arterial and collector
roadways, designers should consider a minimum radius of 65 feet, following a simple curve with taper
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 131
radii . This allows larger trucks to make right turns without the rear tires going off the road and without
veering into opposing vehicle paths . An exhibit from AutoTURN software or equivalent roadway design
turning template software must be provided to the County to demonstrate the corner radius is
appropriate .
4. 5 .4 Auxiliary Lanes
See Chapter 8 of this document for information on auxiliary lanes .
4. 6 CUL - DE - SACS
Cul -de -sacs and dead -end roadways are not common in the County but are sometimes found in
subdivision and residential areas . Cul -de -sacs should be designed with a radius large enough to allow a
standard fire truck to use the cul -de - sac to make a u -turn without having to back up . The minimum
outside curb or pavement edge radius allowed for a cul -de -sac is 5 feet . The minimum right-of-way
turnaround radius is 65 feet . The maximum cul - de -sac length between intersecting streets ( from
centerline to centerline ) is 1 , 500 feet . No more than 20 lots may be served by a permanent cul -de-sac .
The most common design is a circular cul -de -sac with or without a center island . Chapter 5 of A Policy on
Geometric Design of Highways and Streets offers additional design criteria and other types of cul -de -
sacs . The designer must consult the relevant fire protection authority for its minimum criteria as well .
4. 7 BRIDGES
This section is not intended to cover bridge design in detail . It covers only general guidelines . More
detailed bridge design information can be found in the latest editions of AASHTO' s LRFD Bridge Design
Specifications, the Culverts and Bridges chapter in the USDCM , Volume 2 , and CDOT' s Drainage Design
Manual and Bridge Design Manual, as updated .
4 . 7 . 1 Bridge Hydraulic Capacity
During preliminary design , the designer shall complete a hydrologic and hydraulic analysis of the
waterway to correctly size the opening of a new bridge, coordinating with owners as necessary . Bridges
over canals require less hydrologic analysis than bridges over natural drainage ways . Designers shall
gather and analyze background information , such as past inspection reports, measurable high -water
marks, past maintenance issues, scour, and flood records . The storm design frequency for the different
types of roadways and drainage types is shown in Table 4-4 .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 132
Table 4-4 Design Frequencies
Drainage Type J Design Frequency
Multi-Lane Roads
Urban area 100-year
Rural area 100-year
Two- Lane Roads
Urban area 100-year
Rural area
Qso > 4000 cfs 50-year
050 < 4000 cfs 25 -year
Drainage Type Design Frequency
Bridge foundation scour Based on Qdesign if:
Q25 requires Qso scour design and Qloo Check Flood Qso requires Q1oo
scour design and 0200 Check Flood Qloo requires Q200 scour design and
Qsoo Check Flood
In areas that contain the FEMA mapped 100-year floodplain , designers shall use the 100-year discharge
in their designs . If a bridge is being constructed in a 100-year floodplain , all applicable floodplain
regulations and codes apply, including the need to submit a Letter of Map Revision ( LOMB ) to FEMA for
review and acceptance and the need to obtain a Floodplain Hazard Permit from the County .
On wide floodplains, structure loss can be prevented by lowering approach embankments to provide
overflow sections that pass unusual floods over the roadway . This may require relief structures to be
constructed to allow minor flooding without upstream ponding . Factors such as traffic delays and
alternative routes should be considered .
Additional and detailed information can be found in CDOT' s Drainage Design Manual and CDOT' s Bridge
Design Manual.
4. 7 .2 Freeboard
A minimum clearance, or freeboard , shall be provided between the water surface elevation and the low
girder of the bridge . The freeboard is required to allow for wave action , ice, debris, and uncertainty
during estimation .
The minimum freeboard for a bridge should follow these guidelines :
• For a high -debris stream , freeboard should be 4 feet or more . A " high -debris" stream
designation often will be site -specific and shall be determined through consultation with Public
Works officials and local landowners, as well as through a thorough investigation of the debris
potential in the watershed .
• For low- to moderate-debris streams, the minimum freeboard will be 2 feet .
The water surface elevation at a distance of 50 feet to 100 feet upstream of the face of the bridge will
be the elevation to which the freeboard is added to get the low girder elevation of the bridge as a rough
estimate of maximum backwater.
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAG F 133
4. 7 . 3 Bridge Scour
Increased flow velocities at bridge constrictions often lead to scour of the bridge foundations, which can
cause the potential for collapse of the structure . Localized bridge scour is comprised of contraction
scour and local scour at piers and abutments . These three components are added together to create the
final scour envelope .
Methodologies for estimating scour at bridges can be found in the following FHWA guidelines :
• FHWA, Evaluating Scour at Bridges, Hydraulic Engineering Circular No . 18 ( HEC- 18 ) , latest edition
• FHWA, Stream Stability at Highway Structures, Hydraulic Engineering Circular No . 20 ( HEC-20 ) ,
latest edition
Methodologies for designing scour countermeasures at bridges, piers, and abutments can be found in
FHWA' s Bridge Scour and Stream Instability Countermeasures : Experience , Selection , and Design
Guidance, Hydraulic Engineering Circular No . 23 ( HEC-23 ) , latest edition .
4. 7 .4 Use of HEC - RAS
It is acceptable to use the U . S . Army Corps of Engineers ( USACE ) Hydrologic Engineering Center' s River
Analysis System ( HEC- RAS ) to determine the hydraulic characteristics at bridges . Standard modeling
practices accepted by FEMA should be used when performing HEC- RAS modeling .
It is not acceptable to rely on HEC- RAS output for estimating maximum velocities for erosive or
hazardous considerations or local scour in a channel . A more -detailed hydraulic analysis of the specific
cross section , accounting for variable velocities across the channel, is necessary .
4. 7 . 5 Bridge Railing
Bridge railing should be provided along bridge edges to protect both drivers and in applicable situations
pedestrians . Weld County follows CDOT M &S Standards for bridge rail and guardrail design . CDOT' s
M&S Standard Plans, as well as the CDOT Bridge Structural Worksheets, identify several different railing
options and configurations that the designer may consider . AASHTO' s bridge design documents provide
additional information as well .
4. 7 . 6 Minimum Structural Requirements
Design loadings for bridges shall comply with the latest editions of AASHTO' s LRFD Bridge Design
Specifications and CDOT' s bridge design publications .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 134
CHAPTER 5 DRAINAGE CRITERIA
5 . 1 GENERAL
The intent of Weld County' s storm drainage criteria WCECC is to protect the health , safety, general
welfare, and economic well- being of the County and residents, while also protecting property and
infrastructure . The drainage characteristics of Weld County vary greatly throughout the 4, 000 square
miles of the county . This chapter aims to provide greater detail on the expectations and guidance for
drainage - related portions of a project .
Weld County has adopted the following master drainage plans :
• South 1 - 25 Corridor Master Drainage Plan , also known as "Godding Hollow and Tri-Town Study"
( adopted in 1999 ) . The South I - 25 "Tri -Town " Master Drainage Plan from 1999 can be found on
the City of Dacono ' s website .
• Master Drainage Plan for the Area Surrounding Weld County Parkway ( adopted in 2016 ) . This
Master Drainage Plan can be found on the County' s Parkway webpage .
A map of Weld County' s drainage basins is shown in Figure 5- 1 . A full - sized version is provided in
Appendix A .
This manual refers to both the current and older, archived versions of Urban Drainage and Flood Control
District ( UDFCD ) Urban Storm Drainage Criteria Manual ( USDCM ) , Volumes 1 through 3 . This manual will
explicitly state when to use an older version of the USDCM . UDFCD has rebranded as of 2019 and is now
referred to as the Mile High Flood District ( MHFD ) . The MHFD acronym will be used exclusively
throughout the chapter .
It shall be noted that specifically to drainage, some of these references have provided updated values
and equations in recent years that are in accordance with Full Spectrum detention pond design . Weld
County does not support Full Spectrum design and , as such , when standards differ, the instructions and
guidance in the following Drainage Chapter will govern .
All Storm Drainage Guidance documents provided by the County can be found on the Weld County
Public Works Development Review webpageWeld County Planning and Zoning ' s Development Review
webpage .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u i 135
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5 . 2 DRAINAGE LAW
Refer to the Drainage Law chapter of the USDCM Volume 1 / for more information on drainage law as it
relates to stormwater runoff and floodplain management .
.---The owner of upstream property possesses a natural- ease-me-nt on land downstream for
•
in a ma
Inc. .. ,
P . 2d 326 (Colo . App. 1998) .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 136
•--A natural watercourse may be used as a conduit or outlet for the drainage of lands so long as
lands . Ambrosio v. Pearl Mack Construction Co. , 351 P . 2d 803 ( Colo . 1960} .
•—Ditc i corporations t lat own ditc ies owe a cuty to t lose property owners tirough w tic 1 tieir
adjoining
real property . Oliver v. Amity Mut. Irrigation Co. , 994 P . 2d 495 ( Colo . App . 1999 ) .
• A "dangerous condition" constitutes an unreasonable risk to the health or safety of the public,
w tic i is <nown :o exis: or w lice) in : le exercise 02 reasonao e care s -mu c lave been <nown :o
exist and which condition is proximately caused by the negligent act or omission of the public
entity in constructing or maintaining such facility . 24 10 103 C . R . S .
• A Colora-do Registered Professional Engineer is required not only to serve the interests of his or
her employer/client but also is required — as his or her primary obligation —to protect the safety,
health, property, and welfare of the public in cona-pliance . .
Rules of The State Board of Licensure for Architects, Professional Engineers, and Professional
Land Surveyors .
5 . 3 DRAINAGE POLICY
The drainage policies set forth are intended to provide adequate stormwater management to preserve
and promote the health , safety, general welfare , and economic well - being of the County . Weld County
embraces the basic principles defined in the Drainage Policy chapter of the USDCM , Volume 1 .
5 . 3 . 1 Submittal Requirements
The Weld County Public Works DepartmentPlanning Services Department is the agency responsible for
reviewing drainage in the development review process . The submittal requirements for each project
( commercial and residential developments, new roadways, new bridges, channel restorations, etc . ) will
differ based on the scope and location of the improvements .
The Drainage Report Checklist provided in Appendix B shall serve as a guideline for designers throughout
the entire design and construction process . The Drainage Report Checklist provides a framework of
Weld County' s requirements for the drainage report, construction drawings, and operations and
maintenance ( O & M ) plan . The designer shall include this checklist with the preliminary and final
deliverables for the project .
• The drainage report must fully document all assumptions and methodologies and shall contain
copies of all applicable tables and reference materials in an appendix . A drainage basin map
shall be included showing basin delineations, flow arrows, design points, pond volumes, and any
other information pertinent to the design .
• Grading and drainage plans shall be submitted as a single PDF document, printable to scale on
11 - inch x 17 - inch paper .
• To assist owners with maintenance , an Operations and Maintenance ( O & M ) plan for stormwater
facilities and associated infrastructure shall be included with the final drainage report . The O & M
plan should include instructions on safe and correct operations, repair and maintenance of all
installed equipment and facilities, and recommended inspection schedules . The O & M plan to be
distributed to any applicable homeowners' associateassociation or business p-apark association
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 137
( or equivalent ) . Weld County has adopted CDOT' s guidelines for the O & M plan and is provided
in Appendix C .
• Electronic copies of drainage design spreadsheets, models, etc . _ may be requested for submittal
to Weld County for reviewing purposes . AutoCAD base files ( including site layout, roadways,
utilities, survey coordinate system information ) and/or GIS shape files shall be included with the
project' s final submittal for inclusion into the County' s GIS mapping system . Electronic pdf
copies of all calculations relevant to the design of the project shall be included in the drainage
report appendices for review .
• Each plan and report must be prepared by or under the supervision of a professional civil
engineer licensed to practice in the State of Colorado . Plan sheets will contain the Engineer' s
seal ; signed , dated , and sealed per State requirements . Electronic stamps are acceptable .
• The report shall contain the Weld County Drainage Code Certificate of Compliance stating that
the design meets all applicable drainage requirements set forth in this WCECC, with the
exception of County-approved variances . The Certificate of Compliance is available on the
Department of Public WorksPlanning and Zoning' s Development Review webpage . Design
variance request information is to be included on the lower portion of the Certification of
Compliance sheet . The consulting engineer should provide information supporting the variance
request in the form of a drainage memo or letter . Any necessary engineering calculations or
explanation should be provided in the submittal .
• The designer/contractor is to provide an as- built survey, when requested , of the constructed
stormwater facilities upon final completion and inspection of the project for acceptance by
Weld County and issuance of any Certificate of Occupancy . An As- Built Drawing Checklist is
included in Appendix D . The survey will be conducted , signed , dated , and sealed by a
Professional Land Surveyor licensed to practice in the State of Colorado . At a minimum , the as-
built drawings shall include :
1 . Drawing showing design contours versus as- built contours of constructed pond/site ( 1 -foot
contour intervals, labeled )
2 . Spot elevations at critical drainage design points :
• Pond outlet structure
• Pond emergency spillway, start and end of riprap or other required protection
• Pipe/inlet elevations
• Structure inverts
• Exposed Ggroundwater elevation, if applicable
3 . Pond design volume ( stage-storage tables ) versus as- built volumes . The designer/contractor
shall submit a Statement of Compliance signed and stamped by a Colorado Professional
Engineer that verify verifiesand state in writing that the pond as- built volume meets the design
volume requirements .
4 . Drawings shall be properly scaled and sized to clearly show the work that was done through
construction . The contractor toshall provide signed and stamped Engineered copies of relevant
plans and details with updates including the following, but not limited to, updated elevations,
dimensions, and pipe sizes .
5 . All appurtenances and related features wiUshall be located horizontally and vertically by the
surveyor .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 138
Due to a project' s scope and/or location , special permits may be required . Such permits Additional
submittals may include construction permits, floodplain permits, and environmental permits as deemed
necessary by the project scope anc location . Requirements for those special permits are dictated
submittals will follow the guidelines set forth by the approving department or agency .
5 . 3 .2 Data Collection
The County uses information and data provided by FEMA, the National Oceanic and Atmospheric
Administration ( NOAA) , the U . S . Geological Survey ( USGS ) , private consulting engineers, and the
Colorado Water Conservation Board ( CWCB ) . Before commencing design of any drainage project,
designers should collect and evaluate data for the particular watershed area under consideration .
Unless explicitly stated otherwise, Weld County will allow the use of data collection methodologies
other than what is recommended in this WCECC on a case- by-case basis when complete documentation
of all assumptions is provided . Weld County reserves the right to review alternatives and compare with
other commonly used approaches, including those discussed in the USDCM .
5 . 4 RAINFALL
The designer should use the most appropriate and best available data for the project area in
determining the rainfall quantities . Local rainfall data shall be obtained from NOAA Atlas 14 :
Precipitation-Frequency Atlas of the United States, Volume 8 ( Atlas 14 ) unless otherwise approved by the
Department of Public Works, or unless otherwise specified in urbanized jurisdictions and existing master
plans . The use of synthetic rainfall distribution data is not permitted .
5 .4. 1 . 1 Intensity Duration Curves for Rational Method
To develop depth -duration curves or intensity-duration curves for the Rational Method of runoff
analysis, the 1 - hour depth ( s ) obtained from NOAA Atlas 14 can be applied to Equation 5 - 1 below for the
duration ( or durations ) of interest :
_ 28 . 5P1
1 - 0 . � � 6 Eq . 5 . 4 . 1
( 10 + Td )
Where :
• 1 = rainfall intensity ( inches per hour)
• P1 = 1- hour point rainfall depth ( inches )
• T/ = storm duration ( minutes )
For more details regarding the development of rainfall information , refer to the Rainfall chapter of the
USDCM , Volume 1 .
5 . 5 RUNOFF
For more details regarding the development of runoff information, refer to Chapter 8 , Article XI , of the
Weld County Code and the Runoff chapter of the USDCM , Volume 1 . The County explicitly uses the 2007
version of the Runoff chapter of USDCM , Volume 1 and , as such , it has been made available on the Weld
County website . Depending on the size and location of a project, there are three allowable stormwater
runoff calculation methods . Table 5 - 1Table 5- 1 below summarizes the allowable methodology . When
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 139
designing a site with multiple detention basins in parallel or series,the use of Stormwater Management
Model(SWMM)is required for routing.Weld County does not allow the use of CUHP.
WELD COUNTY ENGINEERING&CONSTRUCTION CRITERIA PAGE 140
Table 5 -1 Runoff Coefficient Equations for Weld County/2008 MHFD ( HSG -a )
Size of Basin Allowable Runoff Calculation Method
Less than 5 acres Rational Method required
5 to 160 Acres Rational Method or SWMM allowable
Greater than 160 acres SWMM is required
5 . 5 . 1 The Rational Method
The Rational Method is a simplistic method for determining peak runoff from a proposed development
or road construction project . It should not be used for basins greater than 160 acres . Refer to the Runoff
chapter of the USDCM , Volume 1 provided on the County Website for more information regarding
application of the Rational Method .
The design engineer shall use the Rational Method to perform runoff calculations ( for basin sizes under
160 acres ) . The spreadsheet used to perform runoff calculations, UD- Rationalv1 . 02 , is available for
download on the Department of Public WorksZoing' sZoning' s Development Review webpage . This
spreadsheet utilizes the rational method "C-values" from the 2007 design manual ( shown in Table 5 -3
through Table 5 - 5 below ) . The design consultant may use the downloadable spreadsheets or may create
their own based on the information provided in the following portion of this document . The created
spreadsheets must use the older 2007 C-values or they will notto be accepted . A copy of these runoff
coefficients are provided in Appendix E and on the Weld CountyDepartment of Planning and Zoning' s
Development Review webpage . The rational formula is as follows :
Q = CxIxA Eq . 5 . 5 . 1
Where :
Q = peak runoff rate, cfs
C = runoff coefficient, dimensionless
I = rainfall intensity at the time of concentration , in/ hr
A = area of the basin , acres
The runoff coefficient, C, represents the effects of infiltration , evaporation , retention , and interception
and is calculated based on the soil type and impervious percentages . Higher impervious percentage
values ( roofs, parking lots ) mean the area does not readily allow water to infiltrate into the ground ,
whereas lower impervious percentage values ( parks, green space ) mean the area does allow water to
infiltrate into the ground . The recommended impervious percentage values, I , for Weld County are
provided in Table 5 - 2 , below .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 41
Table 5-2 Percentage Impervious Values for Weld County
Land Use or Surface Characteristics Percent Impervious (%)
Commercial 95
Residential :
Single- Family
Greater than 2 . 5 acres or larger 12
Greater than 0 . 75 acre to 2 . 5 acres 20
Greater than 0 . 25 acre to 0 . 75 acre 30
0 . 25 acre or smaller 45
Multi - Unit Detached 60
Multi - Unit Attached 75
Apartments 80
Industrial :
Light 80
Heavy 90
Solar Facilities :
A & B Soils 2
I C & D Soils 25Site-specific
Parks, Cemeteries 10
Playgrounds 25
Schools 55
Railroad Yard Areas 50
Roofs 90
Undeveloped Areas:
Historic Flow Analysis 2
Greenbelts, Agricultural 2
Streets :
Paved 100
Packed Gravel ( Includes Road Base and Compacted , 40
Cleared , Earthen Areas typically used for
Roads/Parking/Storage )
Recycled Asphalt Pavement 75
Drives and Walks 90
Table 5 - 3 through Table 5 -5 use the impervious percent value ( expressed as a decimal ) to calculate the
runoff coefficients for Natural Resources Conservation Service ( NRCS ) hydrologic soil groups A, B, and
C/ D for various storm return periods .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 142
Table 5-3 Runoff Coefficient Equations for Weld County/2007 MHFD ( HSG -A)
Hydrologic Soil Group A
5-Year 10-Year 100-Year
Equation Cs = (-0 .08i + 0. 09) + Cio = ( -0. 14i + 0 . 17) + Coo = (-0 . 251 + 0 . 32) +
( 1 . 31i3 - 1 .4412 + 1 . 135i ( 1 . 31i3 - 1 .4412 + 1 . 135i ( 1 . 31i3 - 1 .4412 + 1 . 135i
- 0. 12) - 0. 12) - 0. 12)
2% 0 . 00 0 . 07 0 . 22
5% 0 . 02 0 . 10 0 . 24
10% 0 . 06 0 . 14 0 . 28
15% 0 . 10 0 . 17 0 . 30
20% 0 . 13 0 . 20 0 . 33
25 % 0 . 16 0 . 23 0 . 35
30% 0 . 19 0 . 25 0 . 37
35 % 0 . 22 0 . 28 0 . 39
40% 0 . 25 0 . 30 0 . 41
45 % 0 . 27 0 . 33 0 .43
50% 0 . 30 0 . 35 0 . 45
55% 0 . 33 0 . 38 0 . 47
60% 0 . 37 0 . 41 0 . 50
65 % 0 . 41 0 . 45 0 . 53
70% 0 . 45 0 .49 0 . 56
75% 0 . 50 0 . 54 0 . 61
80% 0 . 56 0 . 60 0 . 66
85% 0 . 63 0 . 66 0 . 72
90% 0 . 71 0 . 73 0 . 79
95% 0 . 80 0 . 82 0 . 86
100% 0 . 90 0 . 92 0 . 96
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 143
Table 5-4 Runoff Coefficient Equations for Weld County/2007 MHFD ( HSG -B )
Hydrologic Soil Group B
Equation 5-Year 10-Year 100-Year
C5 = ( Ca + Ccd)/ 2 C10 = (Ca + Ccd)/ 2 0100 = ( Ca + Ccd)/ 2
2% 0 . 08 0 . 17 0 . 36
5% 0 . 10 0 . 19 0 . 38
10% 0 . 14 0 . 22 0 . 40
15 % 0 . 17 0 . 25 0 . 42
20% 0 . 20 0 . 27 0 . 44
25 % 0 . 22 0 . 30 0 . 46
30% 0 . 25 0 . 32 0 .47
35% 0 . 27 0 . 34 0 . 48
40% 0 . 30 0 . 36 0 . 50
45% 0 . 32 0 . 38 0 . 51
50% 0 . 35 0 .40 0 . 52
55 % 0 . 38 0 . 43 0 . 54
60% 0 . 41 0 . 46 0 . 56
65 % 0 .45 0 .49 0 . 59
70% 0 .49 0 . 53 0 . 62
75 % 0 . 54 0 . 58 0 . 66
80% 0 . 59 0 . 63 0 . 70
85 % 0 . 66 0 . 69 0 . 75
90% 0 . 73 0 . 75 0 . 81
95% 0 . 81 0 . 83 0 . 88
100% 0 . 90 0 . 92 0. 96
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGL 144
Table 5-5 Runoff Coefficient Equations for Weld County/2007 MHFD ( HSG C/ D )
Hydrologic Soil Group C/D
5-Year 10-Year 100-Year
Equation Cs = (-0 . 10i + 0. 11 ) + Cio = ( -0. 18i + 0. 21 ) + Cum = (-0 .39i + 0.46) +
(0.858i3 - 0. 78612 + (0.858i3 - 0. 78612 + (0.858i3 - 0 . 78612 +
0 . 774i + 0 . 04) 0. 774i + 0. 04) 0.774i + 0.04)
2% 0 . 16 0 . 26 0 . 51
5% 0 . 18 0 . 28 0 . 52
10% 0 . 21 0 . 30 0 . 53
15% 0 . 24 0 . 32 0 . 54
20% 0 . 26 0 . 34 0 . 55
25% 0 . 28 0 . 36 0 . 56
30% 0 . 30 0 . 38 0 . 57
35 % 0 . 33 0 . 40 0 . 57
40% 0 . 35 0 .42 0 . 58
45 % 0 . 37 0 . 44 0 . 59
50% 0 . 40 0 . 46 0 . 60
55% 0 . 43 0 . 48 0 . 62
60% 0 . 46 0 . 51 0 . 63
65% 0 . 49 0 . 54 0 . 65
70% 0 . 53 0 . 57 0 . 68
75 % 0 . 58 0 . 62 0 . 71
80% 0 . 63 0 . 66 0 . 74
85 % 0 . 68 0 . 71 0 . 79
90% 0 . 75 0 . 77 0 . 83
95 % 0 . 82 0 . 84 0 . 89
100% 0 . 90 0 . 92 0 . 96
5 . 5 . 1 . 1 Time of Concentration
The time of concentration is calculated based on the length , slope , and cover in the basin . The time of
concentration is calculated by adding the initial or overland flow time and the channelized travel time .
tc = tj -I- tt Eq . 5 . 5 . 1 . 1
Where :
tc = Time of concentration , minutes
t; = Initial or overland flow time, minutes
tt = Channelized travel time, minutes
5 . 5 . 1 . 2 Initial or Overland Flow Time
The initial or overland flow time will be calculated as follows :
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 145
0 . 395 ( 1 . 1 - 05 ) ] Li
ti = 0 Eq . 5 . 5 . 1 . 2
So .33
Where :
L, = Length of overland flow, ft ( 500 ft maximum for non - urbanizing undeveloped areas, 300 ft
maximum for urbanizing or developed areas )
S, = Overland basin slope, ft/ft
5 . 5 . 1 . 3 Channelized Flow Time
The channelized flow time ( travel time ) will be calculated as follows :
t Lt = Lt
t = S 60V Eq . 5 . 5 . 1 . 3
60Ko
Where :
Lr = Waterway length , ft
= Waterway slope , ft/ft
K= NRCS Conveyance Factor ( see Table 5 - 6 )
V= Travel time velocity, ft/s
Table 5 -6 NRCS Conveyance Factor, K
Type of Land Surface NRCS Conveyance Factor
Tillage/ Field 5
Short pasture and lawns 7
Nearly bare ground 10
Grassed waterway 15
Paved areas and shallow paved swales 20
5 . 5 . 1 .4 Urban Check
For developed and urbanizing basins, the maximum time of concentration shall not exceed the time of
concentration calculated by the urban check equation as follows :
Lt
t = 0
� Eq . 5 . 5 . 1 . 4
180
Where :
LI = Waterway length , ft
The minimum time of concentration for urbanizing areas is 5 minutes and the minimum time of
concentration for non - urbanizing areas is 10 minutes .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 146
5 . 5 . 2 Larger Basin Rainfall Methods
Based on Table 5- 1 , areas larger than 160 acres require use of the SWMM , developed by the
Environmental Protection Agency ( EPA) . The designer should use the most up-to-date version of
SWMM .
Any supporting modeling data should be included in the drainage report appendices, so that review staff
can adequately review the model . Supporting documentation should include basin information ,
infiltration method used ( with supporting coefficients, curve numbers, soil types ) , rainfall data , stage -
storage curves for ponds and any other pertinent information for the model . Electronic submittals of
the SWMM model are required with each submittal package for review by County staff.
5 . 6 ROADS, INLETS, AND STORM DRAINS
Stormwater collection and conveyance systems ( roads, inlets, and storm drains ) for new developments
shall be designed to convey the 100-year storm event to the proposed detention/retention pond . Street
flooding may occur, in which case traffic is disrupted as the street functions as an open channel ( see
Section 5 . 8 ) . In these cases, the design engineer shall ensure that any flooding or surcharge of the
system shall maintain public safety, minimize flood damages, and allow for emergency vehicle access as
required by the local agency .
Sizing of inlets, pipe systems, culverts or other drainage collection systems on private development sites
should be designed to safely convey flows through the site , in a manner that will protect the site' s users
from harm and will not cause damage to on -site structures . The design engineer for the project shall
provide calculations for pipe sizes, overtopping of roads, ditches, etc . , such that the County' s review
engineers can verify that the drainage on -site is safe for users . The County reserves the right to
comment on private drainage systems that they see as being unsafe or inadequate for the intended site
use . The 100-year developed flows must be transported safely to the site ' s detention pond for a
controlled release .
For information regarding the design of stormwater collection and conveyance systems, refer to Chapter
8, Article XI , of the Weld County Code and the Streets, Inlets, and Storm Drains chapter of the USDCM ,
Volume 1 .
5 . 6. 1 Applicable Software
It is acceptable to use HydroFLOW, CivilStorm , HY-8, FlowMaster, and StormCAD softwares to determine
the hydraulic characteristics of storm networks/culverts . Inlet spread calculations and street capacities
with curb and gutter to be analyzed using newest version available of MHFD' s UD- Inlet spreadsheets
provided on their website . Alternative modeling software may be used upon approval by the
Department of Public Works .
5 . 6 .2 Roadway Drainage
Roadway classifications in Weld County are described in Section 2 . 1 of this WCECC and include freeways
( interstates ) , county highways, arterials, collectors, local roads, and privately maintained roads . For
collector roads, local roads, and privately maintained roads, the maximum encroachment depth over
the roadway crown is 6 inches during the 10-year storm and 18 inches during the 100-year storm .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 147
Allowable roadway overtopping for interstates, county highways, and arterials shall be determined by
the Public Works Director or Designee .
5 . 6 . 3 Inlets
The design guidelines provided in the Streets, Inlets, and Storm Drains chapter of the USDCM , Volume 1
should be used when designing stormwater inlets . In general , the allowable road capacity and maximum
encroachment depth shall dictate the placement of inlets . Inlets should be placed at low points ( sumps ) ,
median breaks, intersections, super-elevation transitions, and before cross walks and bridges, as
required . The standard inlets permitted for use in Weld County streets and roads are shown in Table
5 -7 . Weld County has adopted CDOT ( Type C, Type D, Type R and Type 13 ) and Greeley ( Combination
Type 3 ) Inlet detail , with modifications as provided in details sheets . See Appendix , . Note : Inlet Types C
and D will require close mesh grates as directed by Weld County .
Table 5 -7 Inlets for Weld County
Inlet Type Permitted Use
Curb Opening Inlet Type R All street types with 6 -inch vertical curb
Grated Inlet Type C, D Roadside ditches or swales
Grated Inlet Type 13 Alleys or private drives with a valley gutter
Combination Inlet Type 3 All street types with 6 -inch vertical curb
Various factors, such as debris clogging, pavement overlaying, and variations in design assumptions can
decrease the capacity of inlets . To account for these factors, Weld County recommends that the
theoretical capacity calculated for inlets be reduced by the factors presented in Table 5-8 .
Table 5 -8 Theoretical Capacity of Inlets for Weld County
Percent of Theoretical
Condition Inlet Type
Capacity Allowed
Sump or continuous grade Curb Opening Type R ( 5 -ft Length ) 2 88
Curb Opening Type R ( 10 -ft Length ) 2 92
Curb Opening Type R ( 15 -ft Length ) 2 95
Continuous grade Combination Inlet Type 3 66
Sump 'Grated Inlet Type C or D2 50
Grated Inlet Type 132 50
Combination Inlet Type 3 65
1 Type C and D inlets shall not be placed in roadways
2 CDOT Standards, with modifications
5 . 6 .4 Pipes
The design guidelines provided in the Streets, Inlets, and Storm Drains chapter of the USDCM , Volume 1
should be used when designing stormwater pipes . Pipe networks shall be sized to convey the 10-year
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G r 148
storm event while flowing at 80 percent of the full pipe capacity . In the 100-year event, the hydraulic
grade line ( HGL) shall be kept at least one foot below manhole lids, inlet grates, and inlet curb openings .
The calculated HGL for both the minor and major storm events shall be provided on all proposed final
storm profile views . The minimum flow velocity ( for both storm events ) shall be 3 ft/s to minimize
sediment deposition . Maximum flow velocity ( for both storm events ) shall not exceed 18 ft/s to
minimize scour at the outlet . Erosion protection at the pipe outlet is required for all velocities greater
than or equal to 3 ft/s . Riprap should be used at pipe outlets and have a minimum D50 of 9 inches (Type
L) .
The minimum allowable size for a storm sewer within a public right-of-way or public drainage easement
shall be 15 inches in diameter or equivalent . The Department of Public Works should be contacted to
determine which types of storm sewer pipes are permissible for use in public rights of way or public
drainage easements . Pipes constructed under the travel lanes of a new public roadway shall be
reinforced concrete pipe ( RCP ) , Class 3 strength or greater, depending on traffic loading, or an approved
equivalent . All RCPs shall have a minimum cover of 12 inches above the pipe crown and bell to the
bottom of pavement section ( asphalt or concrete ) at the edge of the roadway . A minimum of 12 inches
of cover above the pipe crown to the top of the finished grade is required for gravel roads . If 12 inches
of cover is not possible, the pipe material must be rated for a minimum of HS- 20 loading or the largest
expected loads crossing it ( i . e . , oil rigs, semi -trucks, etc . ) . The contractor must provide shop drawings for
any precast concrete box culvert ( CBC ) to be approved for use by the engineer.
The Manning' s roughness coefficient " n " for all storm sewer capacity calculations in Weld County shall
be 0 . 013 regardless of pipe material ( e . g . , concrete, polyvinyl chloride [ PVC] , or high -density
polyethylene [ HDPE ] ) — with the exception of aluminized corrugated metal pipe ( CMP ) , which shall have
a coefficient of 0 . 025 . However, the designer should take note that only RCP and CMP are allowed in
public ROW due to ditch burning . Any other pipe material used shall only be placed outside of public
ROW, or upon approval by the Department of Public Works .
5 . 6 . 5 Manholes
Manholes shall be provided to allow for inspection and maintenance of stormwater systems . At a
minimum , manholes shall be placed at all pipe junctions, changes in pipe size or material , and changes in
grade and alignment . For long straight runs of pipe, the distance between manholes shall be limited to
400 feet (for pipe diameters < 42 inches ) and 500 feet ( for pipe diameters ≥ 42 inches ) . Manhole lids
shall not be located within the vehicle wheel path .
Table 5-9 Manhole Sizes
Storm Pipe Diameter ( inches) Manhole Diameter (ft)
15 inches to 18 inches 4 ft
21 inches to 30 inches 5 ft
36 inches to 54 inches 6 ft
60 inches + CDOT Standard M -604-20
It shall be noted that the designer should review the incoming and outcoming pipe angles to ensure that
the manhole diameter can accommodate the pipe skew, when the pipe sewer alignment is not straight
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 149
through , or when more than one sewer line goes through the manhole . Steps shall be provided to allow
safe access into the manhole . Manhole details are provided in Appendix J
5 . 7 OPEN CHANNELS, ROADSIDE DITCHES, AND GRASS SWALES
It is important to distinguish the difference between channels, ditches, and swales . Open channels and
grass swales often are existing drainage conveyances that either carry large offsite flows around a site or
carry onsite flows to a detention pond on - site . County-owned roadside ditches are common along rural
roads and provide runoff conveyance for the County' s roadway infrastructure . Irrigation ditches are not
considered to fall under any of these definitions and shall be treated as separate infrastructure
altogether .
Open channels, grass swales, storm pipe systems, and culverts located on new development sites need
to ensure runoff from the developed site for the 100-year storm event can safely reach the on -site
detention pond with adequate capacity and freeboard . This can be a combination of overland flow,
pipes, or swales to get the runoff to the pond , without it leaving the site . The design engineer needs to
provide calculations to show that the 100-year developed flows make it to the pond without
overtopping or exceeding the capacity of the proposed drainage system . Any off-site flows that are
planned to be routed around the developed site must be designed using a 100-year runoff value, so that
no unplanned flows enter the proposed site that were not planned for in the detention pond ' s spillway
calculations .
Roadway ditches that are designed by consultants for the County ( for County-owned and maintained
roadways only ) may use a developed runoff from the 10-year, 1 - hour storm event in their ditch designs .
For more information regarding the design of open channels, refer to Chapter 8, Article XI , of the Weld
County Code and the Open Channels chapter of the USDCM , Volume 1 . Information regarding the design
of roadside ditches is provided in the Streets, Inlets, and Storm Drains chapter of the USDCM , Volume 1 .
If grass swales are used , they shall be designed in accordance with the Grass Swales Fact Sheet (T-2 ) of
the USDCM , Volume 3 .
5 . 7 . 1 Applicable Software
The design of open channels, grass swales, and roadside ditches is to be completed in FlowMaster or
Hydraflow Express Extension for Autodesk software . Channels, swales, and roadside ditches will be
designed to account for any erosive or hazard conditions .
It is acceptable to use USACE' s HEC- RAS software to determine the hydraulic characteristics of large
open channels . HEC- RAS modeling shall be performed to align with standard modeling practices
accepted by FEMA .
It is the designer' s responsibility to effectively model erosive , hazard , or local scour in a channel for
estimating maximum velocities . The designer shall create a model that adequately places the correct
number of cross sections in the necessary locations to accurately make an evaluation of velocities
throughout the channel to determine its erosive and scour potential .
5 . 7 .2 Open Channels and Swales
Generally, channels and swales should be designed as a trapezoidal shape with a minimum two -foot
bottom width and side slopes no steeper than 4 : 1 . If, however, steeper slopes are required due to site
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGL 150
constraints, the design engineer should address how the channels will be maintained , since it may not
be safe to mow on slopes that are greater than 4 : 1 . The design engineer also should consider the
appropriate seed mix and seeding application method when determining side slopes . More information
on seed mixes and revegetation can be found in Chapter 6 of this WCECC .
Open channels and swales shall be designed to allow the 100-year design flow plus a minimum of one
foot of freeboard . However, channels conveying less than 20 cfs may reduce the minimum one -foot
freeboard requirement to the freeboard required to convey 1 . 33 times the 100-year design flow . The
reduced freeboard may only occur if a one -foot minimum freeboard is not physically possible and
calculations are submitted .
Hydraulic structures ( check/drop structures, bridges, transitions, constrictions, bends, confluences,
rundowns ) associated with open channels shall be designed for the 100-year storm event . For more
information regarding the design of hydraulic structures, refer to Chapter 8, Article XI , of the Weld
County Code, the most recent version of Hydraulic Structures chapter of the USDCM , Volume 2 , and
Chapter 4 . 7 - Bridges of this WCECC .
MHFD has published guidelines for typical Manning' s n values and other design criteria for "V" and
trapezoidal swales . Table 5- 10 through Table 5- 12 and Figure 5 -2 and Figure 5 -3 below provide guidance
for channel design .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 151
Table 5-10 Roughness Coefficients ( "n" ) for Channel Design (After Chow 1959 )
Roughness Coefficients ( n )
Channel Type Minimum Typical Maximum
I . Excavated or Dredged
1 . Earth, straight and uniform
a . Gravel , uniform section, clean 0 . 022 0 . 025 0 . 030
b . With short grass, few weeds 0 . 022 0 . 027 0 . 033
2 . Earth , winding, and sluggish
a . Grass, some weeds 0 . 025 0 . 030 0 . 033
b . Dense weeds or aquatic plants 0 . 030 0 . 035 0 . 040
c . Earthy bottom and rubble/riprap sides 0 . 028 0 . 030 0 . 035
3 . Channels not maintained , weeds and brush uncut
a . Dense weeds, high as flow depth 0 . 050 0 . 080 0 . 120
b . Clean bottom , brush on sides 0 . 040 0 . 050 0 . 080
II . Natural streams ( top width at flood stage 100 ft )
1 . Streams on plain
a . Clean, straight, full stage, no rifts or deep pools 0 . 025 0 . 030 0 . 033
Clean , winding, some pools and shoals, some 0 . 035 0 . 045 0 . 050
b . weeds and stones
Very weedy reaches, deep pools, or floodways 0 . 075 0 . 100 0 . 150
c . with heavy stand of timber and underbrush
Ill . Lined or Built- Up Channels
1 . Concrete
a . Trowel/float finish 0 . 011 0 . 015 0 . 016
b . Shotcrete 0 . 016 0 . 020 0 . 025
2 . Gravel bottom with sides of:
a . Formed concrete 0 . 017 0 . 020 0 . 025
b . Random stone in mortar 0 . 020 0 . 023 0 . 026
c . Dry rubble or riprap 0 . 023 0 . 033 0 . 036
3 . Wetland Bottom Channels See Figure 5 -2
4 . Grass- Lined Channels and Swales See Figure 5 -3
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA FAG eAuti 152
Figure 5-2 Manning's n vs. Depth for Low- Flow Section in a Composite Channel
. 070
065
. 060
°' 055 - - -
CD
c
-I' . 050 -
0)
c
c
c
co
() . 045
.- n = 00001 ( Y : ) - 00025(Y ) + 0.050
. 040
n = 0.0018( 1' ) - 4—
. 035 0.0206(Y ) + 0.099
030
2 3 4 5 6 7 8 9 10
Depth of Flow Y . in Feet
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 153
Figure 5 -3 Manning' s n vs . VR for Two- Retardances in Grass- Lines Channels
05
04 . , .
03 • - - - II -
Channel capacity
design curve
02
, S S . , ,
c
w
, ,
Z- 0 1IIIkill
(C) Retardance
Z.--
Q06
2 05
04 S. 's._
�
03 , . - �— I Limiting velocity
Imili '��
020 1 0 2 0 3 0 4 0 5 0 6 0 8 1 0 2 3 4 5 6 8 10 20 30
VR , PRODUCTOF VELOCITYAND HYDRAULIC RADIUS
From "Handbook of Channel Design For Soil
and Water Conservation, U S Department of
Agnculture, Soils Conservation Service, No
SCS-TP-61 March. 1947 , Rev June. 1954
Table 5 - 11 Trapezoidal Channel Design Guidance/Criteria
Criteria for Various Types of Channel Lining
Design Item
Grass: Erosive Soils i Grass: Erosion Resistant Soils i Riprap Concrete
3 .0 ft/sec 5.0 ft/sec 12.0 ft/sec 18.0 ft/sec
Maximum 1OO-yr Velocity
Minimum Manning's n -
0.030 0.030 0.030 0.011
capacity check
Maximum Manning's n -
0.035 0.035 0.040 0.013
capacitycheck
0.5 0.8 0.8 n/a
Maximum Froude Number
4H :1V 4H : 1V 2.SH : 1V 1.5H : 1V
Maximum side slope
Minimum centerline radius for
2 x top width 2 x top width 2 x top width 2 x top width
a bend
Minimum freeboard 1.0 ft 1 .0 ft 1.0 ft 2.0 ft
5 . 7 . 3 Roadside Ditches
The designer shall design flexible ditch linings based on FHWA' s Design of Roadside Channels with
Flexible Linings, Hydraulic Engineering Circular No . 15 ( HEC- 15 ) guidelines and should coordinate with
the Department of Public Works for approval of the chosen lining . Riprap- lined ditches shall have a
minimum D ;0 of 9 inches (Type L) .
Roadside ditches shall be designed to maintain a minimum of one foot of freeboard during the 10 -year
storm event . Design criteria , provided in the previous Open Channels and Swales section , should be used
in the design of roadside ditches as well .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 154
5 . 8 CULVERTS
Culverts are structures that convey flow through embankments such as roadways and railroads and
should not be confused with storm drainage systems . If a project uses culverts in any facet and connects
to County facilities, then the culvert and associated facilities must convey the 100-year storm event
flow . A culvert is required for every new access point or supporting documentation must be provided to
the County to show that a culvert is not needed . For more information regarding the design of culverts,
refer to Chapter 8, Article III , Article XI , and Appendix 8- B of the Weld County Code and the Culverts and
Bridges chapter of the USDCM , Volume 2 . See also the latest edition of AASHTO' s Roadside Design
Guide .
5 . 8 . 1 Applicable Software
It is acceptable to use FHWA' s HY-8 or CulvertMaster culvert analysis software to determine the
hydraulic characteristics of culverts . Alternative modeling software may be used upon approval by the
Department of Public Works .
5 .8 . 2 Sizing
Culverts shall be sized such that any roadway overtopping meets allowable street capacity and
maximum encroachment depth requirements . The minimum allowable size for a culvert within a public
Iright-of-way or public drainage easement shall be 15 inches in diameter or equivalent . Weld County may
require additional culvert capacity to prevent flooding and backwater effects on adjacent properties .
The storm drainage system for a developed site, via culverts, inlets, swales, pipe systems, must provide
adequate capacity to safely convey the 100-year developed runoff to the site ' s detention/retention
pond without leaving the site . If the culvert/pipe system is undersized and results in flooding, the
flooding must be contained onsite . It should be shown that on -site flooding does not impact permanent
structures or buildings on -site . Developed runoff from the site may not adversely impact adjacent or
downstream properties .
The maximum overtopping of local or collector County roads during the 10-year storm event is 6 inches
and 18 inches in the 100-year event . However, the County prefers to minimize overtopping to the
greatest extent possible . Allowable roadway overtopping for county highways and arterials shall be
determined by the Public Works Director or Designee . Private culverts/swales within developments
must be sized to provide adequate capacity to carry runoff from the 100-year event safely to the
proposed detention/ retention pond .
Additionally, culverts must be sized to meet the maximum headwater to depth ratios ( HW/ D ) listed in
Table 5 - 12 .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 155
Table 5 -12 Maximum HW/ D Requirements for Weld County
Range of Diameter or Height or Rise ( Inches) Maximum HW/D
Less than 36 inches 2 . 0
36 inches to 60 inches 1 . 7
Larger than 60 inches but less than 84 inches 1 . 5
84 inches to less than 120 inches 1 . 2
120 inches or larger 1 .0
Culverts shall be installed to the minimum slope required to achieve a minimum flow velocity of 3 ft/s to
minimize sediment deposition within the pipe . The slope should be checked for each design , and if the
proper minimum velocity is not obtained , other design options should be evaluated . Maximum velocity
at the culvert exit should be consistent with the velocity in the channel to which it discharges so as to
reduce the risk of scouring at the culvert outlet . Energy dissipators may be required and shall be
designed per the most recent version of Hydraulic Structures chapter of the USDCM , Volume 2 , and the
guidelines in the FHWA Hydraulic Design of Energy Dissipators for Culverts and Channels, Hydraulic
Engineering Circular No . 14 ( HEC- 14 ) .
5 . 8 . 3 Materials
Weld County allows the installation and use of commonly available culvert types such as RCP and
aluminized CMP within the public right-of-way . Weld County will allow the use of other culvert types on
a case - by-case basis when complete documentation of all culvert specifications is provided . It should be
n oted that pipe materials that do not withstand high temperatures ( burning of roadside ditches ) , should
n ot be used within the County ROW .
5 . 8 .4 Cover
All culverts must be installed with a minimum of 12 inches of cover above the pipe crown and bell to the
bottom of asphalt at the edge of pavement ( for paved roads ) and a minimum of 12 inches of cover
above the pipe crown to the top of the finished grade ( for gravel roads ) . If 12 inches of cover is not
possible, the culvert material must be rated for a minimum of HS-20 loading or the largest expected
loads crossing it ( i . e . , oil rigs, semi-trucks, etc . ) .
5 . 8 . 5 End Sections and Safety Grate
At a minimum , culverts installed in public rights-of-way must be equipped with a flared end section or
headwalls on the culvert entrance and outlet, as directed by Public Works . Cutoff walls below the outlet
e nd section shall be 4, 500 psi concrete with epoxy coated #5 rebar 12 " on center each way, three inches
clear from all earthen edges, 8" wide x 3 ' deep and 2 ' beyond each outside edge of the end section .
There may be situations in which other types of culvert inlets are necessary . In those situations, the
design methodologies outlined in the Culverts and Bridges chapter of the USDCM , Volume 2 should be
u sed .
Safety grates are strongly recommended at culvert entrances to prevent people, animals, and large
debris from inadvertently entering a culvert . Safety grates shall not be placed at the outlet of culverts or
storm drains . The following conditions may require use of a safety grate :
• It is not possible to see daylight from one end of the culvert to the other .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A G r 156
• The culvert is less than 42 inches in diameter.
• Conditions within the culvert ( bends, obstructions, vertical drops ) or at the outlet are likely to
trap or injure a person .
Exceptions to the above criteria consist of street curb-opening inlets and driveway culverts that are
subject to ponding depths no greater than 12 inches at the flowline and culvert entrances that are made
inaccessible to the public by fencing .
Sound engineering judgement should be used to determine the need for a safety grate while also
considering hydraulic forces and clogging potential . Undersized or poorly designed grates can become
clogged during heavy runoff and the culvert may be rendered ineffective . Additionally, the surrounding
site features and depth and velocity of flow may increase the risk of pinning a human or animal against
the grate . To minimize these hazards, safety grates should be sized according to the Outlet Structures
Fact Sheet (T- 12 ) of the USDCM , Volume 3 and designed to meet the following criteria :
• Grates should be inclined at a slope no steeper than 3 : 1 ( flatter is better) and have a clear
opening at the bottom of no more than 9 inches to permit passage of debris and bed load at
lower flows .
• Weld County does not allow the use of collapsible gratings .
5 .8 .6 Maintenance
The County will maintain culverts located within the County ROW . Private property owners are
responsible for maintenance of their culverts . Culverts that are part of a subdivision drainage plan are
maintained by the respective homeowner' s association . Those culverts should be maintained and
cleaned out on an as- needed basis to ensure proper drainage of the subdivision . Safety grates should be
inspected and cleaned after every large storm event ( at a minimum ) to ensure that the systems remain
effective and that clogging and pinning risks are minimized .
5 . 9 RIPRAP
Riprap should be included on the downstream end of culverts and pipe systems to provide erosion
protection . The following direction should be used when designing riprap aprons at the outlet of
culverts and pipe systems . Mirafi FW-300 or approved equivalent shall be installed under all riprap .
5 . 9 . 1 . 1 Configuration of Riprap Apron
Figure 5-4 illustrates typical riprap protection of culverts outlets .
5 .9 . 1 . 2 Extent of Protection
The length of the riprap protection downstream from the outlet depends on the degree of protection
desired . If it is necessary to prevent all erosion , the riprap must extend until the velocity decreases to an
acceptable value . The acceptable major event velocity is set at 3 ft/sec for non -cohesive soils and at 5
ft/sec for erosion resistant soils . The rate at which the velocity of a jet from a conduit outlet decreases is
not well known . The procedure recommended here assumes the rate of decrease in velocity is related to
the angle of lateral expansion , 0 , of the jet . The velocity is related to the expansion factor, 1 ,
2tan0
which can be determined directly using Figure 5-5Figure 5 5 or Figure 5 - 6Figure 5 6 by assuming the
expanding jet has a rectangular shape :
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 157
L = 1 At _
TA/ Eq . 5 . 9 . 1
P 2 tan 8 Yt
Where :
Lp = Length of protection ( ft )
W = Width of the conduit (ft, use diameter for circular conduits )
Yt = Tailwater depth ( ft )
0 = The expansion angle of the culvert flow
and :
A = Q Eq . 5 . 9 . 2
� V
Where :
At = required area of flow at allowable velocity ( ft2 )
V = the allowable non -eroding velocity in the downstream channel ( ft/sec )
Q = design discharge ( cfs )
For Eq . 5 . 9 . 1 :
• If the tailwater elevation is unknown or unable to be calculated , a value of 0 .4 x the culvert
height or pipe diameter may be used for Yt .
1
• The expansion factor can be found from Figure 5 - 5 and Figure 5 - 6 shown below, after
2tan8
calculating Q/ D2. 5 .
• In the calculations for At, the allowable non -eroding velocity in the downstream channel should
be :
o 3 . 0 ft/sec for erosive soils
o 5 . 0 ft/sec for non -erosive soils
In certain circumstances, Eq . 5 . 9 . 1 may yield unreasonable results . Therefore, in no case should Lp be
less than 3H or 3D, nor does Lp need to be greater than 10H or 10D whenever the Froude parameter,
Q/WH ' 5 or Q/ D2. 5, is less than 8 . 0 or 6 . 0, respectively . Whenever the Froude parameter is greater than
those maximums, increase the maximum Lp required by % Dc or % H for circular or rectangular ( box )
culverts, respectively, for each whole number by which the Froude parameter is greater than 8 . 0 or 6 . 0,
respectively .
Once Lp has been determined , the width of the riprap protection at the furthest downstream point
should be verified . This dimension is labeled "T" on Figure 5 -4 . The first step is to solve for 0 using the
results from Figure 5-5 or Figure 5 - 6 :
8 = tan - 1 1
2 Ex ansionFactor Eq . 5 . 9 . 3
Where :
• Expansion Factor = determined using Figure 5 - 5 or Figure 5-6
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 158
T then is calculated using the following equation :
T = 2 Lp tanO + W Eq . 5 . 9 .4
Figure 5-4 Riprap Apron Detail for Culverts In Line with the Channel ( USDCM, Vol 2 Figure 9-34)
EXTEND RIPRAP TO HEIGHT
OF PIPE OR BOX. MIN . 05 -
T
eartitt
_ 1 I I re .-V;4411,4-141"41:4143
ileaVvalk-oilP.- Ilk IP. .s. r., 'tilos=-To.:
atinassaaaVireVirliali MAO
q�a a , ier,en y ! ��al�a!-+ _ � at Tii►err `an!410
41p
Val WI iffrfiejiWaiatWAZ. Ws411:al ant
erlednilli1/4 SO 41.
Pitt DIPAiriAlbe rearilli_ellreararfreetta It :41Weraikekl
isitr
is leg
.t�� �' r�a�` re
ea�!' aim a �.� � ` l�w ► a� w�4�.:S.�w
aftil. i
Piberitetlia' �''"� .w sa� is M. "ITO,- *reiti ' '►' a
'tea.. _ . :�► .g !4 p rureatitia... 4..arwfri 4Srlirlirlivelike attro,zite4
ima; e! v+:,.„�.a�se s� a '� a a.!�.! as..�l..i.al.�!
Dr OR 2' MIN fare , s � . �b r a.. +r _ a _ .l w ������ i ��a w...`_„�'- _ �.� 00 ��.i ...A�:'.- 4 l: .- later rr � �L . .�" . ., .. .M' 41 r "anir a.
41WPI1' !' e a . ,. tti. aZip
�realb tat; ...ate ;`! !!ii;'+e�,�.��!tictsM!'i ►4'+ •:� ,e'-,► is ..
�. .rte � � ! 1�•- I• ••e�s•- .� . �...aervire . 'i
cede
Aratir.4,..tatgeiwiz:srattiorai::re vipteqpie,
RIPRAP MORE THAN 1 . 0' ABOVE a'' --
PIPE INVERT SHALL BE INSTALLED
6" BELOW FINISHED GRADE AND
BURIED WITH TOPSOIL
PLAN
NTS
FINISHED END TREATMENT MAY CONSIST OF RCP END SECTION
GRADE (WITH TOEWALL) OR HEADWALL
L
a
ate lugs
satT., \fra )tr. xn-c .„--..--,Linrs---.a ."''rf
TOEWALL
8" THICKNESS 2D50 MIN
3' MINIMUM DEPTH SOIL RIPRAP OR
GEOTEXTILE EROSION VOID- FILLED RIPRAP
CONTROL. MIRAFI R AFI 300
OR EQUAL
PROFILE
NTS
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 159
Figure 5 -5 Expansion Factor for Circular Conduits ( USDCM, Vol 2 Figure 9-35 )
9 = Expansion Angle
8
6
p
0 §/11/
Cr V
, N •
5
Or? O
O 0
v 4 Ii i+). O /
L °` 0 /
b ' 0
z ko6
0 3e j ,
eji /
Q /
2 ,
X
wA X
0
0 . 1 .2 3 4 . 5 .6
TAILWATER DEPTH / CONDUIT HEIGHT , Yt / D
/ D
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u L 160
Figure 5-6 Expansion Factor for Rectangular Conduits ( USDCM, Vol 2 Fig 9-36 )
8 = Expansion Angle
8 - -�
T
7
6 _
c
O
N5
cr
g 4 frifee/
t
03
z
d
x
w
1 -
. 1 .2 . 3 . 4 .5 . 6 .7 . 8 .9 1 .0
TAILWATER DEPTH / CONDUIT HEIGHT - Yt / H
The size of riprap can be found using the following graph after calculating Q/ D15 and YID, and reading
the value from Figure 5 -7 and Figure 5 -8, shown below .
Use Figure 5 -7 to determine the required rock size for circular conduits and Figure 5 -8 for rectangular
conduits . Figure 5 -7 is valid for Q/ De' 5 of 6 . 0 or less and Figure 5 -8 is valid for Q/WH15 of 8 . 0 or less . The
parameters n these two figures are :
Q/ D1.5 or Q/WH ° 5 in which Q is the design discharge in cfs, De is the diameter of a circular conduit in feet,
and W and H are the width and height of a rectangular conduit in feet .
Yt/ De or Yt/ H in which Yt is the tailwater depth in feet, De is the diameter of a circular conduit in feet, and
H is the height of a rectangular conduit in feet . In cases where Yt is unknown or a hydraulic jump is
suspected downstream of the outlet, use Yt/Dt = Yt/ H = 0 . 40 when using Figure 5 -7 and Figure 5 -8 .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 161
Figure 5-7 Riprap Erosion Protection at Circular Conduit (Valid for Q/ D2 . 5≤6 . 0) ( USDCM , Vol 2
Figure 9-38)
60
t . I 1
ita<> Co*
In 4C. •C•
--: 40 . . CP 4t4 AC . ,
a Gfr e � QC-
ktl
-c I
20 -
T 'i P E t-
TAIf *
0
O . 2 .4 . 6 . 8 1 .0
Yf / D
Use Da instead of D whenever flow is supercritical in the barrel .
* * Use Type L for a distance of 3D downstream .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGI 162
Figure 5 -8 Riprap Erosion Protection at Rectangular Conduit Outlet (Valid for QJWH1 . 5≤8 .0)
( USDCM , Vol 2 Figure 9-39 )
,
60
Ss
03
�ev 0Q'
Q
--t 1 * •Cr ct 40o w �°j '� .{Q�
I _1/4
4- , Adi? -
4.
o c ,
T .
I
a
O . 2 .4 . 6 .8 1. 0
Yt / H
Use Ha instead of H whenever culvert has supercrit tool flow in the barrel .
** Use Type L for a distance of 3H downstream
After selecting the riprap size , the minimum thickness of the riprap layer is defined as :
T = 2DS0 Eq . 5 . 9 . 5
Table 5 - 13, below, identifies cis() based on riprap classification and gradation .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 163
Table 5- 13 Classification and Gradation of Ordinary Riprap
Riprap Designation % Smaller Than Intermediate Rock dso (inches )'
Given Size by Weight Dimensions (inches)
Type VL 70- 100 12
50-70 9
35-50 6 6"
2- 10 2
Type L 70- 100 15
50-70 12
35-50 9 9"
2- 10 3
Type M 70- 100 21
50-70 18
35-50 12 12"
2- 10 4
Type H 70- 100 30
50-70 24
35-50 18 18
2- 10 6
Type VH 70- 100 42
50-70 33
35-50 24 24
2- 10 9
* ds° = mean particle size (intermediate dimension ) by weight.
" Mix VL and L riprap with 30% (by volume ) topsoil and bury it with 6+ inches of topsoil, all
vibration compacted , and revegetate.
5 . 10 STORAGE
Weld County requires regional and/or on -site detention for all future developments . The County shall be
contacted to verify if any existing drainage master plans exist in the area of work . If it is determined that
there is an existing master plan for the area of work, the designer shall incorporate that information into
the design and ensure that the design follows the drainage requirements set forth in the masterplan .
The designer also should keep the following things in mind :
• Weld County does not allow detention release rates based on soil types .
• Weld County _ does not allow full spectrum detention to be used in sizing ponds ( see Weld
County' s spreadsheets for storage capacity) .
5 . 10 . 1 Retention
Stormwater retention facilities ( stormwater infiltration facilities ) normally are not allowed in Weld
County but shall be considered for special circumstances with the issuance of a variance . Variance
requests shall only be considered in situations where there is a proven hardship on the proposed site . A
hardship would be considered where there is not adequate topography to physically drain a pond ( sump
in basin ) , refusal of an irrigation ditch to accept additional drainage , or some other physical site
constraint . Variances shall be reviewed on a case - by-case basis to determine the validity of the hardship
and shall be signed by the CountyDevelopment Review Engineer . Upon the determination that a
retention pond is applicable , the volume should be calculated as 1 . 5 x the developed site runoff for the
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 164
100-year, 24- hour storm event plus 1 foot of additional freeboard . An emergency spillway is required for
retention ponds .
Retention ponds may be sized using the " Modified FAA" tab on the spreadsheet referenced in the
" Detention" portion of this document, using a near zero release rate per acre and extending the rainfall
duration to 1440 minutes ( 24- hours x 60 minutes ) . The resulting volume at the 1440- minute interval
shall be the value that must be multiplied by 1 . 5 for the final retention pond volume .
A second method for calculating retention pond volume is :
Volume = 1 . 5 x Area x C-Value x Rainfall
• Area = Site area draining to pond ( acres )
• C-Value = Composite C-Value for area draining to pond ( based on soil type and overall ,
developed impervious percentage for site )
• Rainfall — NOAA Atlas rainfall depth for site location , 100-year storm at 24- hours ( in feet, divide
NOAA rainfall depth in inches by 12 )
• Volume = Required Volume for Retention Pond in acre -ft
The retention pond/infiltration facility shall be designed to meet Colorado Revised Statute 37 -92 - 602 ( 8 )
drain time requirements . In order to meet the State Statute requirements, soil infiltration rates may be
used to calculate pond drain times . However, soil infiltration rates cannot be used in the overall sizing
of the detention/retention ponds . These requirements state that retention facilities :
• Be solely operated for stormwater management;
• Be owned and operated by a governmental entity or is subject to oversight by a governmental
entity;
• Continuously releases or infiltrates at least 97 percent of all runoff from a rainfall event that is
less than or equal to the 5 -year storm within 72 hours after the end of the event;
• Continuously releases or infiltrates at least 99 percent of the runoff from a rainfall event that is
greater than the 5-year storm within 120 hours after the end of the event; and
• Operates passively and does not provide active water treatment processes for the stormwater .
5 . 10 . 2 Detention
Developments are required to detain the runoff ( developed site condition ) produced by the 100-year, 1 -
hour storm event with 1 foot of additional freeboard . Pond release rates are based off the calculated
undeveloped runoff value for the site . A 2 - percent site imperviousness percentage should be used to
calculate the historic runoff rate for pond release values, regardless of site conditions prior to new site
improvements .
Release rates are calculated using the 5-year, 1 - hour storm for urbanizing areas and the 10-year, 1 - hour
storm for non - urbanizing areas . Urbanizing areas are defined as areas within one -quarter mile of any
municipal boundary, as amended . Non - urbanizing areas are greater than one -quarter mile in distance
from a municipal boundary . Municipal boundaries may be found on the County' s GIS online mapping
website . If the project site is within an urbanizing area or adjacent to a municipal boundary, the
governing entity' s drainage criteria must be taken into consideration . Weld County requires that the
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 165
more restrictive of the criteria ( if municipality is more conservative ) must be used in the drainage design
of the site .
The design engineer shall submit all design worksheets for pond designs in the appendices of the
drainage report for review . Rainfall data/depths should be site specific and taken from the NOAA Atlas
14, online precipitation frequency data server webpage . A UD- Detention v2 . 34 worksheet is available on
the Weld County Planning and Zoning
Development Review webpage . This spreadsheet is an older, archived version of the MHFD' s
spreadsheet, which utilizes the " Modified FAA" procedure for pond sizing with the County approved C-
values . The County DOES NOT accept the full spectrum detention pond design method . The design
consultant may use the downloadable spreadsheets or may create their own based on the information
provided in this document . If created spreadsheets are utilized , they must comply with the design
requirements in this document .
Rainfall duration times should be extended until the pond reaches a peak volume, after which the pond
volume falls . If the peak is not reached within a reasonable time period ( less than two to three hours ± )
the volume at the 60- minute interval may be taken as the required detention volume for the site . If a
series of detention ponds are proposed on -site , the County may require a SWMM model be created for
the development, so that the pond volumes/water surface elevations can be analyzed as routed ponds .
An excerpt from a previous version of USDCM , Volume 2 on the Modified FAA procedure has been
provided on the i Weld County Planning and
Zoning Development Review Webpage , and in Appendix F for reference, if the consultant would like to
create their own pond - sizing spreadsheet .
The outlet works for detention and water quality facilities shall be designed to meet Colorado Revised
Statute 37 -92 -602 ( 8 ) , drain time requirements . In order to meet the State Statute requirements, soil
infiltration rates may be used to calculate pond drain times . However, soil infiltration rates cannot be
used in the overall sizing of the detention/ retention ponds . These requirements state that detention
facilities :
• Be solely operated for stormwater management;
• Be owned and operated by a governmental entity or be subject to oversight by a governmental
entity;
• Continuously release or infiltrate at least 97 percent of all runoff from a rainfall event that is less
than or equal to the 5 -year storm within 72 hours after the end of the event;
• Continuously release or infiltrate at least 99 percent of the runoff from a rainfall event that is
greater than the 5 -year storm within 120 hours after the end of the event; and
• Operate passively and do not provide active water treatment processes for the stormwater .
5 . 10 . 2 . 1 Pond Layout Considerations
The geometry of a stormwater detention facility depends on specific site conditions such as adjoining
land uses, topography, geology, preserving or creating wildlife habitat, and volume requirements .
Several key features must be incorporated in all detention facilities :
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A U E 166
• Embankments and side slopes shall have a maximum slope of four feet horizontal to one foot
vertical (4 : 1 ) and shall be stabilized . Slopes steeper than 4 : 1 in detention basin areas will not be
accepted .
• Detention basin embankments shall be designed to withstand the 100-year and larger storm .
Poorly compacted native soils shall be excavated and replaced . Embankment soils shall be
compacted to at least 95 percent maximum density ( Modified Proctor) or as specified in the
geotechnical report for the site .
• Detention basin bottoms shall have a minimum slope of 1 percent for vegetated surfaces . If the
desired slope is not attainable, a bottom slope of 0 . 5 percent may be used with a concrete
trickle channel .
• Water quality and detention flows are released through an outlet structure . The minimum
outlet pipe size for use in detention facilities is 12 - inch diameter ( or equivalent ) .
Orifice/ restrictor plates may be used to reduce flows from the minimum pipe sizes .
• When possible , place inflow culverts as far from the pond outlet as possible for increased water
quality through pond vegetation .
• Inflow points shall enter the detention basin at or near the toe of the basin to prevent erosion
along the basin embankments . If providing an inflow point at the toe of the basin is not feasible ,
then erosion protection must be provided from the inflow all the way to the toe of the basin .
• Detention basin bottom must be a minimum of 24 inches above the groundwater elevation .
( Groundwater elevation data must be determined during high groundwater months . )
• Detention basins must be located a minimum of 20 feet away from an irrigation ditch or other
facility, or more if specified by the owner of the irrigation canal and protected from seepage
from the irrigation canal .
• Stormwater infiltration facilities shall not be placed in the FEMA mapped floodway and should
not be placed in the FEMA mapped 100-year floodplain . Any berming within the floodplain will
require a floodplain study, which may result in the need for a LOMR/CLOMR .
5 . 10 . 2 .2 Water Quality
With drain time requirements in mind , the outlet works for an extended detention basin shall be
designed to release the water quality capture volume ( WQCV ) over a 40- hour period . The WQCV may be
calculated , along with the orifice hole sized , on the MHFD spreadsheet . An alternate method to
calculate the required WQCV is to use the equations taken from USDCM , Volume 3 as shown below .
The WQCV is calculated as a function of imperviousness and BMP drain time using Eq . 5 . 10 . 2 . 1 , and as
shown in Figure 5 -9 :
WQCV = a ( 0 . 91i3 — 1 . 19i2 + 0 . 78i ) Eq . 5 . 10 . 2 . 1
Where :
WQCV = Water Quality Capture Volume ( watershed inches )
a = Coefficient corresponding to WQCV drain time ( 5 - )
i = Imperviousness ( %/ 100 )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA Y A G E 167
Figure 5 -9 Water Quality Capture Volume (WQCV) Based on BMP Drain Time ( USDCM , Vol 3 Fig
3- 1 )
0. 500 - - - - -
t i
140 hour drain time
0 450 - - _ --
tA
I
cu 0. 440 a - - 1
f 24 hour drain time rf
c 0. 350
V WV=a 1, 91/3 1 . 19F+0. 780
w 0. 300 ---------- - • --- ---4 - -4- a,
n 12-hr drain time a = 0. 8 - -
cp 0. 250 24 -hr drain lime d = 0. 9 - *.s .
40 -hr drain time a = 1 . 0 � . r`
alp
er
' s 0. 150 � e
U de•r 12 how drain time I
CY 0100 't _ - - •
et
0. 000 a - p - - -
0 01 0, 2 0 .3 OA 0 . 5 n, 6 0. 7 0 . 8 0 .9 1
Total Imperviousness Ratio 0 = Ial100)
Figure 3- 1 . Water Quality Capture Volume ( WQCV ) Ba ;cd on EfltP Drain Time
Table 5 -14 Drain Time Coefficients for WQCV Calculations
Drain Time ( hrs) Coefficient, a
12 hours I 0 . 8
24 hours 0 . 9
40 hours 1 . 0
Weld County does not require the use of trash racks be placed in front of the water quality plate . It shall
be at the discretion of the design engineer if trash racks are included . The WQCV is considered a part of
the overall detention/ retention volume requirement and should not be added to the volume .
The water quality orifice plate perforations also may be found using the chart in Table 5 - 15 only .
WELD COUNTY ENGINEERING 8z. CONSTRUCTION CRITERIA PACIP 168
Table 5 - 15 WQCV Outlets Orifice Plate Perforation Sizing
Orifice Plate Perforation Sizing
Circular Perforation Sizing
This table may be used to size perforation in a vertical plate of riser pipe .
Hole Dia . Hole Dia . Min . Si: Area per Row ( sq . in . )
(in . ) * ( in . ) ( in . ) n = 1 n = 2 n = 3
1 /4 0 . 250 1 0 . 05 0 . 10 0 . 15
5/16 0 . 313 2 0 . 08 0. 16 0 . 24
3/8 0 . 375 2 0 . 11 0 . 22 0 . 33
7/16 0 . 438 2 0 . 15 0 . 30 0 . 45
1 /2 0 . 500 2 _ 0 . 20 0 . 40 0 . 60
9116 0 . 563 3 0 . 25 0 . 50 0 . 75
5/8 0 . 625 3 0 . 31 0 . 62 0 . 93
11 /16 0 . 688 3 0 . 37 0 . 74 1 . 11
3/4 0 . 750 3 0 . 44 0 . 88 1 . 32
13/16 0 . 813 3 0 . 52 1 . 04 p 1 . 56
7/8 0 . 875 3 0 . 60 1 . 20 1 . 80
15/16 0 . 938 3 0 . 69 1 . 38 2 . 07
1 1 . 000 4 0 . 79 1 . 58 2 .37
1 1 /16 1 . 063 4 0 . 89 1 . 78 2 . 67
1 1 /8 1 . 125 4 0 .99 1 . 98 2 . 97
1 3/16 1 . 188 4 1 . 11 2 . 22 3 . 33
1 1 /4 1 . 250 4 1 . 23 2 . 46 3 . 69
1 5/16 1 . 313 4 1 . 35 2. 70 4 . 05
1 3/8 1 . 375 4 1 . 48 2 . 96 4 . 44
1 7/16 1 . 438 4 1 . 62 3 . 24 4 . 86
1 1 /2 1 . 500 4 1 . 77 3 . 54 5 . 31
1 9/16 1 . 563 4 1 . 92 3 . 84 5 . 76
1 5/8 1 . 625 4 2 . 07 4 . 14 6 . 21
1 11 /16 1 . 688 4 2 . 24 4 . 48 6 . 72
1 3/4 1 . 750 4 2 . 41 4 . 82 7 . 23
1 13/16 1 . 813 4 2 . 58 _ 5 . 16 7 . 74
1 7/8 1 . 875 4 2 . 76 5 . 52 8 . 28
1 15/16 1 . 938 4 2 . 95 5 . 90 8 . 85
2 2 . 000 _ 4 3 . 14 6 . 28 f 9 . 42
n = Number of columns of perforations
Minimum steel plate thickness 1 /4 " 5/16" 3/8 "
* Designer may interfere to the nearest 32 ' " inch to better match
the needed area if desired.
Rectangular Perforation sizing
Rectangular Min . Steel
Use only one rectangular column whenever two hole Width Thickness
2 ; inch diameter circular perforations cannot provide 5" 1 /4
needed outlet area . 6" 1 /4 "
7" 5/32 "
Rectangular Height = 2 - inches 8" 5116
9" 4 11 /3
Width = Required Areaper Row / 2 '' 10" 3/8 ..
RectangularW dt q > 10 1 /2
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 169
5 . 10 . 2 . 3 Outlet Structure
Included below is a typical configuration for a detention pond outlet structure . The detail shows the
general features and layout of the basic components of a typical outlet structure . Figure 5- 10 is not a
construction detail . The design engineer will be required to design the outlet structure to meet the
needs of the individual site plan and topography .
In addition , the following items must be included in the outlet structure design :
• The outlet pipe must contain a minimum of two concrete cutoff walls embedded a minimum of
18 inches into undisturbed earthen soil . The cutoff walls must be a minimum of 8 inches thick .
• The outlet pipe bedding material must consist of native earthen soil , not granular bedding to at
least the first downstream manhole or daylight point .
• A water quality plate designed to release the WQCV in 40- hours attached to the front of the
structure . Plate should be a tight fit with no gaps . Gasket or seal could help facilitate this fit .
• A restrictor plate attached to the back wall of the structure to limit the pond release to the
calculated 5 -year or 10-year historic runoff rate for the site ( see detention pond section for
details ) .
• The outlet pipe must be a minimum diameter of 12 - inches .
• To reduce maintenance and avoid operational problems, outlet structures must be designed
with no moving parts other than the trash rack ( i . e . use only pipes, orifices, and weirs ) . Manually
and/or electrically operated gates shall be avoided . To reduce maintenance, outlets should be
designed with openings as large as possible, compatible with the depth -discharge relationships
desired and with water quality, safety, and aesthetic objectives in mind .
• Outlets should be robustly designed to lessen the chances of damage from debris or vandalism .
Avoid the use of thin steel plates as sharp-crested weirs to help prevent potential accidents,
especially with children . Trash racks must be provided on all outlet structures .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 170
Figure 5-10 Outlet Structure Plan and Profile Example
OUTLET REQUIREMENTS OUTLET STRUCTURE
- WQCV SHALL BE RELEASED OVER 40 HOURS r OUTLET PIPE
- OUTLET WORKS SHOULD BE SIZED AND 12" MIN.
STRUCTURALLY DESIGNED TO RELEASE AT
NO MORE THAN THE 1 -HOUR, 5-YEAR
HISTORIC RELEASE RATE IN URBANIZING in "40--- RESTRICTOR
AREAS AND THE 1 -HOUR, 10-YEAR HISTORIC
ORIFICE PLATE
RELEASE RATE IN NON-URBANIZING AREAS.
- OPENINGS IN THE SAFETY GRATE SHALL
ALLOW ENOUGH FLOW TO PASS THE 5-YEAR .
OR 10-YEAR HISTORIC FLOW (DEPENDENT
ON URBANIZATION CLASSIFICATION). USING SAFETY
---NN
A 50% CLOGGING FACTOR. GRATE '
q / WATER QUALITY
• PLATE
- STEEL FOR GRATES AND GRATE
INSTALLATION HARDWARE SHALL BE - 41-61:-
GALVANIZED AND CONSTRUCTED IN AA'
ACCORDANCE WITH CDOT SECTION 712.06. Al!k
.
- CONCRETE SHALL BE CDOT CLASS D, 4500
PSI IN 28 DAYS, PER CDOT SPECIFICATION 03 •441 SECTION 601 .
PLAN VIEW
- REINFORCEMENT BARS SHALL BE PER COOT WQCV WSEL
SPECIFICATIONS. SPACING AND SIZE TO BE
DETERMINED BY CONSULTING DESIGN
ENGINEER.
j 1
{J
- STEPS SHALL BE PROVIDED WHEN HEIGHT IS , I I 100-YEAR RESTRICTOR
GREATER THAN 3'-6" AND SHALL CONFORM I i ORIFICE PLATE PLATE
TO AASHTO M 199. lei (3/8" MIN. HOT-DIPPED
1 (4� . GALVANIZED)
WOCV ORIFICE PLATE 1
(HOT-DIPPED - - OUTLET PIPE
GALVANIZED STEEL) , . F -0- 1 .j__t.r
12" MIN.
I I I
• F 1 I' 1 r T ri I `
l , I 1 I - 1
I i -
_ I � I
I
SECTION A-A'
SAFETY GRATE
WQCV WSEL
is \•..,
\ /
��-A_. es 1 . 1 100-YEAR RESTRICTOR
• ORIFICE PLATE PLATE
• (3/8" MIN. HOT-DIPPED
,3 A GALVANIZED)
WOCV ORIFICE PLATE ,
HOT-DIPPED OUTLET PIPE
GALVANIZED STEEL i 12' MIN.
,
/\ / , /0 , . ,:, .. _ A/ / /u,
>\///
..\\ NA \\N, /2, \\//\\/ s . \.
/ V/ M \`/ //// /j,
/,\ / e/e,,,,,,( .4\ .,\
\ / „, /*,' .-
/ , // , // , .2/>4`.>" >7. , 71 . ///\\,//7- , " ;
SECTION B-B'
5 . 10 . 2 .4 Stage Storage Curves
A relationship between the water surface elevation and detention basin volume, commonly referred to
as a "stage -storage" curve , needs to be developed for each pond . The afore mentioned MHFD
spreadsheet will calculate a stage -storage table based on overall pond dimensions, however the County
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A 6 E 171
requires the stage -storage volumes be based on the actual site design contours . The volumes may be
calculated in the " Basin " tab of the spreadsheet by using the " Surface Area at Stage ( ft2 ) override"
column or by using the equation below .
Another method of calculating the stage -storage volume is called the " Conic" method and is based on
the following formula :
V = D A -I B V14B ) a E . 5. 10. 2 . 2
3
Where :
V= Volume between two contours, ft3
D = Depth between contours, feet
A = Area of bottom contour, ft2
B = Area of top contour, ft2
A cumulative volume should be provided for the progressing stages/depth of the pond . The required
pond volume for water quality and detention should be compared to the available pond volume
provided in the design . The information should be clearly shown in the project' s drainage report .
5 . 10 . 2 . 5 Spillway
Detention ponds and stormwater infiltration facilities ( retention ponds ) shall contain an emergency
spillway capable of conveying the peak 100-year storm discharge ( from developed site ) draining into the
pond/infiltration facility . The spillway also should be capable of passing any off-site flows that are routed
through the pond un -detained . The spillway location should be placed so that downstream properties or
residences are not adversely affected . The invert of the emergency spillway must be equal to or above
the 100-year WSEL . The elevation of the top of the embankment should be a minimum of 1 foot above
the water surface elevation when the emergency spillway is conveying the maximum design or
emergency flow . The depth of flow over the emergency spillway shall be 6 inches or less . Additional
spillway details are shown in Appendix J .
Flow over a horizontal spillway can be calculated using the following equation for a horizontal broad -
crested weir, shown below .
Q = CBcwLH1 . 5 Eq . 5 . 10 . 2 . 3
Where :
Q = Discharge , cfs
CBcw = Broad - crested weir coefficient, dimensionless ( ranges from 2 . 6 to 3 . 0 )
L = Length of weir, ft
H = Head above weir crest, ft
In addition , the County requires the following items be included in the spillway design .
• A concrete cutoff wall 8 inches thick, 3 feet deep, and extending a minimum of 5 feet into the
embankment on each side of the emergency spillway opening is required on all privately
maintained detention ponds/infiltration facilities and regional detention ponds/ infiltration
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 172
facilities . The concrete cutoff wall permanently defines the emergency spillway opening . The
emergency spillway elevation shall be tied back into the top of the embankment using a
maximum slope of 4 : 1 .
• To protect the emergency spillway from catastrophic erosion failure, riprap shall be placed from
the emergency spillway downhill to the embankment toe of slope, with a toe -down constructed
to a depth of 4xD50 . The minimum D50 for riprap on the emergency spillway shall be 12 inches
(Type M ) . Riprap may be either grouted or buried . If buried , the protected area shall be covered
with 6 inches of topsoil and seeded . Revegetation requirements for storage facilities can be
found in Chapter 8 of this WCECC .
A detail of the preferred spillway design is in Figure 5- 11 below .
Figure 5-11 Emergency Spillway Typical Design
EMERGENCY SPILLWAY
100 YEAR WSEL - 1' MINIMUM
OR HIGHER
1' MINIMUM 6" MAXIMUM
- FLOW OVER
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U SLPE SPILLWAY- a �I �- -�
• • 'w t r
et:tr. :Loll •:.:A;eaa.use4•41:2rri:.:1. ect'oaLtsfsom&•al ;Is pests st saki LZ'oemrlis1/4 400.ttul ;4 'TWO 1$5 BARS
tr
FRONT VIEW
OVERTOPPING
SPILLWAY WATER
SURFACE
100 YEAR WSEL 6" MAX
1 8" MINIMUM THICKNESS
i f r COMPACTED EARTH
��_ 95% STANDARD
3 PROCTOR DENSITY
SAFETY GRATE `
�� ��i BURIED OR GROUTED RIPRAP (DEPTH = 2 x DEO
`'`� ' '� ���
WQCV WSEL EMERGENCY ,,,V' PLACED TO TOE OF SLOPE
SPILLWAY WALL X
' / 100-YEAR `il � GEOTEXTILE FABRIC MIRAFI FW 300
• OR APPROVED EQUAL
WQCV RESTRICTOR �=
ORIFICE PLATE .i I. I
PLATE LOW TAILWATER BASIN
IF VELOCITY EXCEEDS 2 FPS
CONCRETE OUTLET PIPE
CUTOFF WALL MINIMUM SIZE 12' HEADWALL AT
CONCRETE END OF PIPE
CUTOFF WALL
EMERGENCY SPILLWAY REQUIREMENTS SIDE VIEW
- EACH DETENTION POND SHALL CONTAIN AN EMERGENCY SPILLWAY CAPABLE OF CONVEYING THE PEAK 100-YEAR STORM AT A DEPTH OF SIX (6) INCHES
OR LESS. BURIED OR GROUTED RIPRAP SHALL BE PLACED FORM THE EMERGENCY SPILLWAY DOWNHILL TO THE EMBANKMENT TOE OF SLOPE AND
COVERED WITH SIX (6) INCHES OF TOPSOIL. IF BURIED. THE RIPRAP MUST BE SIZED AT THE TIME OF FINAL ENGINEERING DESIGN. GROUTING OF THE
RIPRAP MAY BE REQUIRED.
- IN ORDER TO PREVENT DAMAGE TO PUBLICLY-OWNED INFRASTRUCTURE (ROADS, ROADSIDE DITCHES), A CONCRETE CUTOFF WALL EIGHT (8) INCHES
THICK. THREE (3) FEET DEEP, AND EXTENDING A MINIMUM OF FIVE (5) FEET INTO THE EMBANKMENT ON EACH SIDE OF THE SPILLWAY OPENING IS
REQUIRED ON ALL DETENTION PONDS. THE EMERGENCY SPILLWAY ELEVATION MUST BE TIED BACK INTO THE TOP OF THE EMBANKMENT USING A
MAXIMUM SLOPE OF 4t 1 .
- CONCRETE SHALL BE CDOT CLASS D, 4500 PSI IN 28 DAYS. PER COOT SPECIFICATION SECTION 601 .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 173
5 . 10 . 2 .6 Maintenance
Maintenance for stormwater storage facilities should follow the recommendations in the USDCM ,
Volume 3 , unless otherwise specified by the design engineer. It is recommended that stormwater
infiltration facilities be scraped/ plowed every few years to prevent sedimentation and /or clogging and
to ensure proper infiltration is being achieved . Areas designated for stormwater drainage , detention , or
stormwater infiltration , are not to be used for materials storage , building, or parking, and should not be
modified without approval from the Department of Public Works . Access also must be provided to the
drainage facilities for long-term maintenance . Refer to Section 5 . 3 . 1 of this WCECC for O & M submittal
requirements .
5 . 10 . 2 . 7 Exceptions to Detention Requirements
Below is a list of developments that may qualify for exceptions from detention requirements. Exceptions
to stormwater detention must be shown toshall not jeopardize the public health , safety, and welfare of
public and private property . The following exceptions are provided in Chapter 8, Article XI , of the Weld
County Code and are subject to updates :
• Use by right or accessory use in the A ( Agricultural ) Zone District
• Zoning permits for accessory storage , commercial vehicles, home occupations, or manufactured
homes in the A ( Agricultural ) Zone District
• A second dwelling permit in the A ( Agricultural ) Zone District
• Towers, including but not limited to wind and telecommunication towers
• Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any
other above ground appurtenances
• Gravel pits, if the stormwater drains into the gravel pit . Releases from the site shall comply with
the Weld County Storm Drainage- Criteriathis Engineering and Construction Criteria Manual ,
including dewatering . Topographical information will be provided .
• Rural residential developments with no historic flooding, where all the following conditions
exist . This exception shall be supported by calculations provided by the Applicant . Additional
information may be requested and will be signed and stamped by a Colorado licensed
Professional Engineer :
a . There are nNine ( 9 ) lots or fewer .
b . The average minimum lot size is equal to , or greater than , three ' 31 acres per lot .
c . Downstream roadway criteria are not exceeded .
dhc . The total post-development imperviousness for the rural residential development does not
exceed 10 ten percent ' 10% ) , assuming that all internal roads and driveways are paved
eventually will be paved .
• Development of sites where the change of use does not increase the imperviousness of the site .
Note : This exception cannot be applied to sites where impervious surfaces were added for, or in
conjunction with, a business that is/was operating in violation and/or without the required Weld
County land use permit .
• re the total pre existing and po
event . This exception shall be supported by calcul-atio-n`s signed and stamped by a Colorado
licensed Professional Engineer . A parcel of land or protect site where the "total developed
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 174
stormwater runoff ' from the 100-year, 1 - hour storm is less than , or equal to , five ; 5 ) cfs . The
"total developed stormwater runoff ' includes cumulative runoff from the proposed project site
plus runoff from any previously developed project site on the sub . ect parcel . A project site is
the area of land that lies within the prosect' s limits of disturbance during construction . This
exception shall be supported by calculations signed and stamped by a Colorado Licensed
Professional Engineer.
• In -fill development parcels parcels with total area c-less than , or equal to, one ; 1 .01 gross acre .
• An individual parcel with an unobstructed flow path and no other parcel ( s ) between the channel
within a Federal Emergency Management Administration ( FEMA regulatory floodplain channel
and the project .
• A parcel ›-greater than one ' 11 gross acre and c-less. than , or equal to five ( 51 gross acres in size
is allowed a onetime exception for a new four thousand ' 24,0001-_ square foot ( sq . ft . building
or equivalent imperviousness .
• _ A parcel > 5 gross acres in size is allowed a onetime exception for a new 4, 500 sq . ft . building of
100% impervious area or equivalent imperviousness .
• A parcel greater than five ; 5 ) gross acres in size is allowed a onetime exception for a new nine
thousand ( 9, 000 ) sq . ft . of 100% imperviousness area or equivalent imperviousness .
• Concentrated Animal Feeding Operations ( CAFOs ) , Animal Feeding Operations ( AFOs ) , and
Housed Commercial Swine Feeding Operations ( HCSFOs ) that which are covered and approved
by the Colorado Discharge Permit System ( CDPS ) regulations . Portions of the site not included or
covered by the CDPS permit shall comply with the criteria set forth in this Chapter.
addressing the following itemsException requests shall be supported with an approved drainage
narrative, which must describe the following minimum criteria :
• Any existing and proposed improvements to the propertyThe exception being requested for
consideration .
• The exception being requested for considerationAny existing and proposed improvements to
the property .
• Where the water originates if it flows onto the property from an offsite source
• Where the water flows as it leaves the property_
• The direction of flow across the property .
• Previous drainage problems with the property, if any .
• The location of any irrigation facilities adjacent to or near the property_
• Any additional information pertinent to the development .
During the review of the application , the Weld County Public WorksDepartment of Planning and Zoning
Department will determine if the exception is applicable and will not jeopardize the health , safety, and
welfare of public and private property .
5 . 10 . 3 Dam Information
All detention ponds shall be evaluated to verify if the detention facility would be classified as a non -
jurisdictional or jurisdictional dam , per the State of Colorado Department of Natural Resources criteria .
Refer to Table 5- 16 .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PALE I 75
Table 5-16 Non-Jurisdictional vs Jurisdictional Dam Criteria Summary
Non-Jurisdictional Dam Jurisdictional Dam
Jurisdictional Height of Berm < 10 ft > 10 ft
Water Storage Area ( at High Water < 20 ac > 20 ac
Line )
Water Storage Volume < 100 ac-ft > 100 ac-ft
* This table is a general summary of the required State Criteria. The Designer shall be required to determine which category their
design would be classified as and determine the required protocol. This information will then be supplied to the County for
record keeping purposes.
If it is determined that the detention facility is classified as a jurisdictional dam , state procedures must
be followed . It should be noted that non -jurisdictional-size dams are regulated and subject to the
authority of the State Engineer consistent with Sections 37 -87 -012 and 37 -87- 105 C . R . S . ,
Implementation of detention ponds, and will require the design engineer to consult with the State
Engineer' s Office to verify the legal right to store water .
5 . 10 .4 Irrigation Ditches/Private Irrigation Systems
It is not the intent to allow new private irrigation systems to be located within County right-of-way .
Irrigation ditches shall not be used as conveyance systems and/or outfall points for stormwater runoff
for all land use cases including, but not limited to : Uses by Special Review, Site Plan Reviews,
Subdivisions, or Planned Unit Developments, unless such use is approved , in writing, by the ditch
owner( s ) . The approval shall be in the form of signature on the construction plans/documents or other
formal legal agreements as required by the ditch company or owner . Should direct discharge of
stormwater runoff be permitted , water quality treatment may still be required .
In the instance where an irrigation ditch serves as the outfall for a stormwater detention facility, the
following items must be met :
• The maximum water surface elevation must be determined based on the maximum amount of
irrigation flow in the ditch . The appropriate owner/ditch or reservoir company is the
determining authority regarding the maximum irrigation flow in the ditch . Written verification of
the maximum irrigation flow from the owner/ditch or reservoir company must be submitted
with the hydraulic analysis of the ditch water surface elevation .
• The detention outlet must be designed such that backflow from the ditch into the detention
facility is prevented .
• The backwater effects caused by the design of a detention outlet, if any, must be reviewed and
approved by both the County and the appropriate ditch or reservoir company .
• The outlet design must consider tailwater effects on the outlet pipe resulting from the
combination of the maximum irrigation flow and the 100-year storm discharge within the ditch .
• Drain times need to adhere to Colorado Revised Statute 37-92 -602 ( 8 ) drain time requirements
as listed in the " Detention Pond " section of this document .
If new developments are adjacent to irrigation facilities but no flows are being directed into the ditch ,
the owner/ ditch or reservoir company must still be notified of the proposed development . In such
cases, it shall be the developer' s engineer responsibility to provide drawings and calculations to support
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA 176
the fact the irrigation ditch is not impacted . These drawings and calculation shall be supplied to the
County and ditch company owner .
The party seeking modifications to existing ditch conditions must obtain the appropriate owner / ditch
or reservoir company approvals and signatures prior to seeking Weld County approval for such
modifications .
The party seeking modifications to the existing irrigation facilities must coordinate with the irrigation
system owner/operator to provide an adequate design to make the irrigation system function as it did
prior to the improvements . When modifications to existing irrigation systems are necessary, the
following must be provided to the County review staff:
• Information on how the existing private irrigation facilities are to be protected or routed
through the project site .
• Plan and profile drawings of any new irrigation pipes should be included in the drawing set,
similar to information for proposed storm lines .
• A hydraulic model showing the irrigation pipe system at full irrigation flows should be provided
in the drainage report for review by County staff.
• Irrigation flows should be provided by the owner of the irrigation system , not estimated on
existing pipe or ditch sizes .
• Details of any irrigation structures required should be provided in the plan set for the
development . Dimensions of the structures, concrete type and thickness, rebar type and
spacing, grates, weir boards, bridge , trash racks, connecting hardware , air vents etc . should be
included in the details of the irrigation structures .
• Owner approval of the new system is required before construction can proceed .
• Proposed private irrigation facilities for new developments or reconfigured existing irrigation
systems should be located outside of the public right-of-way .
As- built survey is required documenting all changes in direction and structure critical elements plus
video of all pipes installed verifying pipe connections and debris removal .
5 . 11 STORMWATER DRAINAGE CRITERIA VARIANCES
In cases of hardship, an applicant is able tomay apply for a variance from a requirement of the storm
drainage criteria . Weld County will not approve design variances seenfound to be detrimental to the
public health , safety, and general welfare or when the request is contrary to the purpose and intent of
the criteria set forth in this document or the Weld County Code . The variance procedure is intended to
address cases of hardship, and requests will not be granted when the hardship is brought about solely
through the actions of the appellant .
Variance requests shall be stamped and signed by a professional civil engineer licensed to practice in the
State of Colorado and shall be submitted with the Certificate of Compliance . DevelopmentVariance
requests will be reviewed by the Public Works Director or his/her designeeDevelopment Review
Engineer. To be reviewed , the variance request must :
• State the hardship that is causing the request for a variance from Weld County Code . Provide
proof of the hardship in the drainage memo/letter provided .
• Describe the design criteria of the Weld County Code from which a variance is being requested .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 177
• Describe the proposed alternative with engineering rationale that supports the intent of the
Weld County Code .
• Meet the design intent of the Weld County Code .
• Demonstrate that granting of the variance will still adequately protect public health , safety, and
general welfare .
• Demonstrate there are no adverse impacts from stormwater runoff to the public rights of way
and/or offsite properties as a result of the project .
Applicants may appeal the denial of a variance to the BOCC pursuant to the provisions in Chapter 2 ,
Article IV, Section 2 -4- 10 of the Weld County Code . Variance requests, if accepted , are not precedent
setting and are based on site -specific constraints .
5 . 12 OIL AND GAS STORMWATER MANAGEMENT
The following standards apply only to the development of oil and gas exploration and production in the
Weld Mineral Resource ( Oil and Gas ) Area . These standards shall be supported by calculations signed
and stamped by a Colorado licensed Professional Engineer and accepted by the Weld County
Department of Public Works . See also Chapter 21 of the Weld County Code .
• Oil and Gas Tank battery secondary containment . When calculating the Oil and Gas Location
imperviousness and pervious areas, secondary containment areas may be excluded from the
total site imperviousness and pervious calculations provided that the secondary containment
area is appropriately sized to hold the originally designed safety containment volumes plus the
100-year, 1 - hour storm rainfall event .
• Detention pond storage volume . In non - urbanizing areas during the Construction Phase,
detention ponds shall be sized to store the stormwater runoff generated by the 1 - hour, 100-
year storm falling on the developed site and release of the detained water at the historic runoff
rate of the 1 - hour, 10- year storm falling on the undeveloped site or at 5 cfs, whichever is
greater . Historic is defined as an undeveloped site ( before any development ) with an assumed
2 . 0 percent imperviousness maximum . During the Production Phase or in urbanizing areas,
detention ponds shall adhere to Sec . 8- 11 - 100 . A . 1 . of the Weld County Code .
• Detention pond freeboard . During the Construction Phase , less than 1 foot of freeboard may be
allowed on a case - by-case basis . This exception shall be supported by calculations signed and
stamped by a Colorado licensed Professional Engineer and accepted by the Weld County
Department of Public Works . During the Production Phase , the detention pond shall adhere to
Sec . 8- 11 - 100 . A .4 of the Weld County Code .
• Emergency spillway . To prevent damage to publicly owned infrastructure ( roads, roadside
ditches ) , a cutoff wall is required on all privately maintained detention ponds and retention
ponds . The cutoff wall permanently defines the emergency spillway opening . The emergency
spillway elevation must be tied back into the top of the embankment using a maximum slope of
4 : 1 . The cutoff wall must either be constructed of concrete or galvanized steel sheet pile .
Concrete cutoff walls must adhere to Sec . 8- 11 - 100 . A . 7 of the Weld County Code . Steel sheet
pile cutoff walls must be hot dipped galvanized steel of % - inch thickness or 3 -gauge and extend
3 feet below the bottom of the pond or per manufacturer' s recommendation , whichever is
greater . If steel sheet pile is proposed for the cutoff wall , the native soils must be tested for
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE j 78
sulfate levels . If the sulfate levels are above 1 . 0 percent, the sheet pile shall be coated with a
corrosion - resistant epoxy .
• Retention pond . Retention facilities shall be allowed without a variance only during the
Construction Phase . Retention facilities that are proposed for the Production Phase require the
issuance of a variance requested by the Applicant and accepted by the Weld County Department
of Public Works .
Additionally, as part of the application for a 1041 WOGLA Permit, an Operator shall provide proof of a
valid stormwater discharge permit issued by CDPHE . The Operator shall submit a drainage report to
comply with required Storm Drainage Criteria pursuant to Chapter 8, Article XI of the Weld County Code .
Additional requirements for Municipal Separate Storm Sewer System ( MS4 ) areas may be applicable
pursuant to Chapter 8, Article IX of the Weld County code .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 179
CHAPTER 6 GRADING EROSION CONTROL AND MS4 REQUIREMENTS
6. 1 EROSION CONTROL & GRADING REQUIREMENTS
Weld County requires an erosion control and grading plan . Erosion control methods are implemented to
prevent the offsite transport of sediment from land - disturbing activities . Erosion has the potential to
damage adjacent properties and County drainage systems, as well as contributing to the degradation of
water quality . When properly installed and maintained , temporary control measures provide effective
erosion control for a site . At a minimum , a stormwater management plan ' SWMP ) shall include erosion
control and grading plans .
6 . 1 . 1 Applicability
Sites disturbing more than one acre ( Sec . 8- 12 - 30 . B ) of land _ or any applicable earth disturbance in an
required to obtain a Grading Permit . For MS4
areas the MS'la grading permit may be required for any disturbance . The definition of disturbance in the
Weld County Code is when the surface area of the land ' s surface is disturbed by any work activity upon
the property by means including, but not limited to, grading; excavating ; stockpiling soil , fill , or other
materials; clearing ; vegetation removal ; removal or deposit of any rock, soil , or other materials; or other
activities that expose soil . Disturbed area does not include the tillage of land that is zoned agricultural or
the tillage of a parcel zoned PUD ( planned unit development ) within the area identified for agricultural
uses . For Grading Permit exemptions, refer to Section 8 - 12 - 30 of the Weld County Code .
6 . 1 . 2 Grading and Erosion Control Plans
When applying for a Grading Permit, a Grading Plan , a Utility Map ( Sec . 8- 12 - 50 . C ) , a Drainage Plan and
a Sediment & Erosion Control Plan shall be submitted for review . A Grading Permit Checklist, provided in
Appendix G , should be used for guidance in developing the Grading Plan and Sediment & Erosion
Control Plan to expedite the review process .
The main components of the Grading Plan and Sediment & Erosion Control Plan are :
1 . Site Drainage — identifying existing and proposed grading and drainage features ( swales, inlets,
manholes, curb and gutter, concrete pans, culverts, roof drains, ponds, and outlet structures )
designed to convey stormwater runoff. Site drainage grading will be consistent with accepted
Drainage Plan for the site .
2 . Temporary Control Measures ' BMPs ! — identifying, detailing, and locating all structural and non -
structural temporary control measures used during each phase of construction , from initial
disturbance to final stabilization , to prevent the discharge of sediment from the site .
Additionally, the plan will include installation , implementation , maintenance, and removal
specifications for each structural control measure and a narrative description of each non -
structural control measure .
3 . Permanent Stabilization — identifying the means and methods used to achieve stabilization for
all disturbed areas . Stabilization includes, but is not limited to ; seed mix, seed application
method , mulch type , mulch application method , soil testing, soil amendments, and erosion
control blankets . Additionally, the plan will include installation , implementation , and
maintenance specifications for each structural control measure and a narrative description of
each non -structural control measure .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE, 80
A complete set of plans will include separate plan sheets for all three phases of construction identified
as follows :
1 . Initial Phase — depicting current site conditions, including existing structures, drainage patterns,
topography, etc .
2 . Interim Phase — depicting temporary control measures used during active construction .
Depending on construction phasing, multiple sheets may be required . At a minimum , vehicle
tracking, perimeter control and inlet/outlet protection will be addressed with temporary control
measures . In addition , the plans should note that a state - issued Dewatering Permit will be
obtained and submitted to Weld County Public Works prior to any dewatering activities .
3 . Final Phase — depicting temporary control measures to remain in place after construction until
the site reaches final stabilization . Final stabilization is when all landscaping is complete and
seeding has reached at least 70 percent uniform permanent vegetative cover. At a minimum ,
perimeter control will remain in place and maintained until final stabilization is reached . In
addition, other temporary control measures may be required to remain in place and maintained ,
if necessary, to prevent offsite sediment transport while waiting for vegetative growth .
Plan sheets will be submitted electronically digitally and should be clear and legible . The Development
Review Engineer reserves the right to require plan modifications for readability purposes . In addition ,
each temporary control measure used will be located on the applicable site plan and referenced in the
legend , and an installation and implementation specification will be attached . Public Works
recommends using USDCM Volume 3 , Chapter 7, Construction BMPs, for clear and specific installation
and implementation specifications . Other methods may be approved on a case - by-case basis .
6 . 1 . 3 Implementation
During construction, the Grading Plan , Utility Map, Drainage Plan and Sediment & Erosion Control Plan
shall be kept onsite and available for reference by site workers and County inspectors . In accordance
with the state- issued Construction Permit, temporary control measures should be inspected by a
Qualified Stormwater Manager at a minimum of every two weeks and after storm runoff events;
however, more frequent inspections may be necessary to properly maintain temporary control
measures .
If changes to the approved Grading Plan and Erosion & Sediment Control Plan are necessary, Public
WorksWeld County shall be contacted to determine if a Grading Permit modification is necessary . Public
WorksWeld County inspectors shall verify site conditions with the approved set of plans . Violations may
occur if site conditions do not reflect the approved plans .
6. 1 .4 Grading Permit Deadline (Fee) & Extension
6. 1 .46. 1 . 5 Tracking Control
Tracking control is required when construction activity is accessing onto a roadway surface other than
gravel . There are three tracking control options when required to mitigate impacts to the public road ,
including damages and/or offsite tracking of mud or other materials . Regardless of option , drainage
and/or culverts must be maintained . The associated appropriate tracking control devices for each
situation are listed below .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 181
• Permanent access onto concrete , asphalt, or recycled asphalt ( RAP ) public road
a . Double cattle guards used in combination with 100 feet of asphalt
b . Or 300 feet of asphalt
• Permanent access onto gravel public road
a . Double cattle guards with 100 feet of aggregate surface course ( See Section 9 . 6 . 6 )
b . Or 300 feet of aggregate surface course ( See Section 9 . 6 . 6 )
c . Aggregate surface course ( See Section 9 . 6 . 6 ) on all drive surfaces
• Temporary access onto either concrete , asphalt, or recycled asphalt ( RAP ) or gravel public road .
Culverts or accepted drainage report may be required for temporary access control pads .
a . County accepted prefabricated tracking pad
b . Aggregate with base and a minimum of 70 feet long ( per Error ! Reference source not
found . Fi•gure 6- 1 )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 182
Figure 6-1 Tracking Control for Temporary Accesses
r► B
G
Z
d
CC
0 15' MIN ;
f-
X
W
$ SHALL EXTEND FULL WIDTH
B OF INGRESS AND EGRESS
OPERATION
PLAN VIEW
rami
EXISTING GROUND 70" MIN.
6" MIN
,, \
�'ti''` •
NA'ti` EXISTING PAVEMENT
/` OR GRAVEL ROAD
N-MIRAFI FW300 GEOTEXTILE (DEPTH VARIES)
OR EQUIVALENT
ELEVATION SECTION
XISTING GROUND
6" MIN
\:` et is imp sip or al •
•,- › .,
a AIL ta Alt 7b... Airs
MIRAFI FW300 GEOTEXTILE
OR EQUIVALENT
SECTION B - B
NOTES:
1 . AGGREGATE SHALL CONFORM TO CDOT SPECIFICATIONS, SUBSECTION 208
2. THE CONTRACTOR SHALL PROTECT CURB AND GUTTER, EDGE OF PAVEME
OF GRAVEL ROAD THAT CROSSES OR IS ADAJACENT TO THE ENTRANCE FR(
WHILE NOT BLOCKING FLOW OF WATER. IN THE CASE THERE IS AN EXISTINC
CULVERT IS REQUIRED. PROTECTION OF THE ADJACENT ROADWAY MATERIAL:
ABOVE SHALL BE INCLUDED IN THE COST OF THE WORK AND NOT PAID FOI
3. ALL MATERIALS AND LABOR TO COMPLETE THE VEHICLE TRACKING PAD
INCLUDED IN THE COST OF THE WORK AND NOT PAID FOR SEPARATELY.
4. THE PAY ITEM NUMBER FOR VEHICLE TRACKING PAD (EACH) IS COOT ST
SPECIFICATION 208-00070.
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 183
6 . 2 MS4 REQUIREMENTS
Sites located in Weld County' s state - permitted Municipal Separate Storm Sewer System ( MS4 ) area are
required to comply with the Grading Permit requirements as well as additional MS4 requirements . Weld
County is categorized as Phase II . An MS4 is a conveyance or system of conveyances that is :
• Owned by a state , county, city, town , or other public entity that discharges to waters of the
United States
• Designed or used to collect or convey stormwater ( including storm drains, pipes, ditches, etc . )
• Not a combined sewer
• Not part of a publicly owned treatment works ( sewage treatment plant )
EPA' s Stormwater Phase II Rule established a management program that is intended to reduce the
quantity of pollutants that enter MS4s from stormwater . Common pollutants include oil and grease
from roadways, pesticides and fertilizers, sediment from construction sites, and discarded trash . When
deposited into nearby waterways through MS4 discharges, these pollutants can impair the waterways,
discourage recreational use , contaminate water supplies, and interfere with the habitat for aquatic
organisms, fish , and wildlife .
In compliance with the provisions of the Federal Water Pollution Control Act ( commonly referred to as
the Clean Water Act ) , as amended ( 33 USC 1251 et seq . ) , the EPA promulgated rules establishing Phase I
of the NPDES stormwater program in 1990 . The 1990 Phase I program requires operators of medium
and large MS4s ( defined as those serving populations of 100, 000 or greater) to implement a stormwater
management program to control pollution . State law has similar provisions ( Colorado Water Quality
Control Act, CRS 25 -8 - 101 et seq ) .
The 1999 Stormwater Phase II Rule extended coverage of the NPDES stormwater program to certain
"small " MS4s in urbanized areas (those serving populations of 10,000 to 100, 000 ) . Small MS4s located in
urbanized areas are defined by the Census Bureau based on the most recent Census . New urbanized
areas will be identified in each subsequent Census, occurring every 10 years . Generally, Phase I MS4s are
covered by individual permits, and Phase II MS4s are covered by a general permit . Each regulated MS4 is
required to develop and implement a program to reduce the contamination of stormwater runoff and
prohibit illicit discharges . Operators of small MS4s are required to design their programs to reduce the
discharge of pollutants to the " maximum extent practicable . " In Colorado, the program is administered
by the Colorado Department of Public Health & Environment ( CDPHE ) Water Quality Control Division .
(The Colorado program is referred to as the Colorado Discharge Permit System , or CDPS, instead of
NPDES . )
6 . 2 . 1 Designated MS4 Areas and Responsibilities
The MS4 mapped areas areof reviewed annually by Weld County and are designated by CDPHE based on
population density . Currently, MS4 municipalities in Weld County include Greeley, Evans, Windsor,
Firestone , Erie, LaSalle, Brighton , Longmont, and a small portion of Northglenn and Thornton . As Weld
County continues to grow in population , each of these MS4 areas will continue to expand , potentially
encompassing urbanized parts of Frederick and Dacono .
The MS4 permit requires the County to implement a Construction Sites Program to prevent the
discharge of pollutants to the MS4 from applicable construction activities . The MS4 permit also requires
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 184
a Post-Construction Program to treat stormwater runoff from applicable development sites . These
responsibilities are handled through coordination between the departments of Planning and Public
Works .
6 . 2 .2 Applicability of MS4 Requirements
quirements .
The Department of Public Works hods the authority to de '
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. .
The MS4 Permit mandates specific requirements for construction activities resulting in a land
disturbance of greater than or equal to one ( 1 ) acre . The same requirements apply to land disturbance
that is less than one ( 1 ) acre but is part of a larger common plan of development or sale with a planned
disturbance of greater than or equal to one acre . For subdivisions, planned disturbance is equal to the
cumulative potential development area as specified by Chapter 23 of the Weld County Code and/or the
Master Drainage Plan for the subdivision, if more restrictive .
io
6a2 •2 . 2 Constructn c ivit
The MS4 Permit defines construction activity as ground -surface -disturbing activity, which includes, but is
not limited to, clearing; grading; excavation ; demolition ; and installation of new or improved haul roads,
access roads, staging areas, stockpiling of fill materials, and borrow areas . Activities that include routine
maintenance to maintain original line and grade, hydraulic capacity, or original purpose of the facility
are not considered construction activities . Activities to conduct repairs that are not part of regular
maintenance and activities that are for replacement are considered construction activities and are not
considered routine maintenance . Repaving activities where underlying or surrounding soil is cleared ,
graded , or excavated as part of the repaving operation are construction activities unless they are an
excluded site under Part I . E . 4 . a . i . of the permit .
6 . 2 . 3 Required Permits
6 . 2 . 3 . 1 CDPS Construction Stormwater Permit
When construction activities result in land disturbance of one ( 1 ) acre or more, or less than one acre but
part of a larger common plan of development, the owner and operator must obtain a CDPS Construction
Stormwater Permit, issued by CDPHE , prior to the start of land - disturbing activities . Under certain
conditions, an R- Factor waiver may be obtained from CDPHE .
As part of the permit, a Stormwater Management Plan ( SWMP ) must be kept onsite at all times .
Additionally, the site must have a Qualified Stormwater Manager ( QSM ) , a person knowledgeable about
stormwater requirements and capable of implementing the SWMP in its entirety .
Refer to the CDPHE website for more information on the CDPS Construction Stormwater Permit, R-
Factor Waiver, and a SWMP preparation guidance document .
6 . 2 . 3 . 2 CDPS Construction Dewatering Permit
When construction activities require dewatering, the owner and operator must obtain a CDPS
Construction Dewatering Permit, issued by CDPHE, prior to the start of dewatering activities . Under
certain conditions, as specified in CDPHE' s Low Risk Discharge Guidance for Discharges of
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 185
Uncontaminated Groundwater to Land, a dewatering permit may not be required . However, if the
dewatering activity is not complying with the guidance document and/or there is a threatened discharge
of pollutants to the MS4, the Department of Public Works will issue a Stop Work Order until a CDPS
Construction Dewatering Permit is obtained and the threatened discharge no longer exists .
Refer to the CDPHE website for more information on the CDPS Construction Dewatering Permit and
CDPHE' s Low Risk Discharge Guidance for Discharges of Uncontaminated CDPHE 's Low Risk Discharge
Guidance for Discharges of Uncontaminated Groundwater to LandGroundwater to Land.
6 . 2 . 3 . 3 Weld County Grading Permit
When construction activities will result in land disturbance of one acre or more , or less than one acre
but part of a larger common plan of development, the owner or operator must obtain a Grading Permit,
issued by Weld County Public Works, prior to the start of land -disturbing activities . In some cases, when
disturbing less than one acre within a developing subdivision , a Grading Permit may be required
depending on other construction activities in the area . Additionally, a Grading Permit may be required
for sites not located within the MS4 area but discharge into an MS4 drainage system . Exemptions to the
Grading Permit do not apply to properties located within the MS4 area , and variances to MS4
requirements will not be granted .
6 . 2 .4 MS4 Requirements for Pre - Construction
As of July 1 , 2019, theThe following requirements apply to any applicable development or construction
activity within the MS4 area . This includes the resubdivision of land since it is considered a " larger
common plan of development . " The Department of Public Works will review each case and determine
the applicability of the site and if any exclusions are approved ( see Post-Construction exclusions below ) .
6 . 2 .4 . 1 Site Plan Review
The following documents shall be submitted , reviewed , and accepted by Public WorksWeld County staff
prior to any applicable construction activity requiring a Grading Permit . In addition , construction activity
not requiring a Grading Permit may be required to submit applicable documents if determined
necessary to comply with MS4 requirements .
6 . 2 .4. 2 Drainage Report
Drainage Reports shall be signed and stamped by a Colorado licensed Professional Engineer. A Drainage
Report Checklist, provided in Appendix B, should be completed and submitted with the report . The four
main components of the Drainage Report relating to MS4 requirements are :
a . General Content — describing the nature of the development, basic characteristics of the site ,
and proposed drainage improvements designed to comply with Weld County drainage and MS4
requirements . This includes specifying the MS4 " Base Design Standard " used in the design of the
permanent water quality control measure .
b . Hydrology and Hydraulic Analysis — including the calculations, narratives, and design details for
permanent structural control measures and associated drainage features to show compliance
with the MS4 Permit' s " Base Design Standards . "
c . Construction Drawings — detailing the existing and proposed drainage, permanent water quality
control measure ( s ) to be installed , and specifications for structural components .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 186
d . Long-Term Operations and Maintenance Plan — for permanent water quality control measures
and associated drainage features . The plan shall include frequencies of inspections and
maintenance and narratives for non -structural control measures, if applicable . Refer to USDCM
Volume 3 Chapter 6 for guidance on maintaining permanent water quality control measures .
When designing a permanent water quality control measure and developing maintenance procedures,
Public Works will conduct routine inspections for the life of the control measure to ensure proper
functioning and adequate maintenance is being performed . Inspections generally occur every year;
however, some sites may qualify for inspections every five years based on factors such as the control
measure type/design , facility type , pollutant load , and historical compliance . If there are no structural
components to visually confirm volume capacity, such as a concrete trickle channel , micro - pool , or
forebay, a survey conducted by a Professional Land Surveyor shall may be required .
Additionally, a Colorado licensed Professional Engineer l-shall provide confirmation of the existing
volume capacity meeting the approved Drainage Report calculations . The survey and report will be
submitted may be required to be submitted every five years for the life of the facility .
6 . 2 .4. 3 Grading and Sediment & Erosion Control Plans
Grading and Sediment & Erosion Control Plans shall be signed and stamped by a Colorado licensed
Professional Engineer. A Grading Permit Checklist, provided in Appendix G , should be used in developing
plans to expedite the review process . For details, refer to Section 6 . 1 .
The main components of the Grading Plan and Sediment & Erosion Control Plan have been identified in
Section 6 . 1 . 2 above .
6 . 2 .4.4 MS4 Pollution Prevention Plan
Then MS4 Pollution Prevention Plan Checklist and Manual is available-in Appendix H _; available on the
Public Works, Development Review webpage, The checklist shallshould _ be completed and submitted
with the plan . The designer should note that if the checklist requirements are covered in the Grading
Plan and Sediment & Erosion Control Plan , a separate MS4 Pollution Prevention Plan is not necessary .
developed for the state issued Construction Stormwater Permit . A Professional Engineer' s stamp is not
required for MS4 Pollution Prevention Plans . The manual contains County-approved installation and
maintenance specifications for temporary control measures . Specifications for proprietary temporary
control measures/ such as concrete washout structures and vehicle tracking pads, shall be submitted
and approved prior to use .
The MS4 Pollution Prevention Plan should Checklist and Manual was developed to help the Qualified
Stormwater Manager ( (ISM ) with implementation ofidentify, detail, and locate all structural and non -
structural temporary control measures used during each phase of construction , from initial disturbance
to final stabilization, to prevent the discharge of pollutants from the site . ,
includelt is the QSM ' s responsibility to identify all potential pollutants onsite and to implement
temporary control measures for each pollutant . . tion specifications for each
ctural control measure .
At a minimum , pollutant sources associated with the activities fisted shall be addressed in the plan . The
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 187
he temporary control measure
will be reviewed on a case by case basis .
A list of potential pollutants include :
• Vehicle tracking of sediments
• Land disturbance and storage of soils
• Loading and unloading operations
• Outdoor storage of construction site materials, building materials, fertilizers, and chemicals .
• Bulk storage of materials
• Vehicle/equipment maintenance and fueling
• Significant dust- or particulate -generating processes
• Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, and
oils
• Concrete truck/equipment washing, including the chute and associated fixtures and equipment
• Dedicated asphalt/concrete batch plants or masonry mixing station
• Waste sources such as sanitary waste , construction site waste, and worker trash
• Other non -stormwater discharges, including construction dewatering or power washing
• Other areas or operations where spills can occur ( if so, specify)
Details of the Temporary Control Measures ( BMPs ) to be implemented to the potential pollutants listed
above can be found in Chapter 7 of USDCM , Volume 3 .
6 . 2 .4. 5 Future Development
For developments not requiring a Grading Permit, such as a re-subdivision of land or phased
construction sites, MS4 requirements remain applicable . If no land -disturbing activities are planned , the
applicant may only be required to submit a Drainage Report, including, but not limited to, the design of
a permanent water quality feature and associated drainage features and a Long-Term Operation and
Maintenance Plan . Upon commencement of land -disturbing activities, additional documents, such as a
Grading Plan , Sediment & Erosion Control Plan , and MS4 Pollution Prevention Plan will be required .
6 . 2 . 5 MS4 Requirements for Construction Activity
6 . 2 . 5 . 1 Stormwater Inspections
As required by the MS4 Permit, the County is required to routinely inspect construction sites at a
frequency of at least every 45 days . The Department of Public Works maintains the authority to increase
inspection frequencies based on historical violations .
It is the responsibility of the applicant to contact the Department of Public Works to schedule the first
inspection , at which time, the temporary control measures necessary to begin construction will be
inspected ( I . e . perimeter control and vehicle tracking control ) . The applicant shall provide notice a
minimum of seven days prior to commencing construction activity . Failure to schedule an inspection is
considered a violation of MS4 requirements, and a stop work order or other enforcement actions may
be pursued .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u E 88
During routine inspections, the inspector shall review the current site conditions using the documents
submitted during the review process . Significant changes in plans may require modifications to be
submitted for approval . Minor changes should be noted in the Grading Plan and Sediment & Erosion
Control Plan, MS4 Pollution Prevention Plan , or SWMP, which are to be kept onsite at all times .
The inspector shall assess all onsite control measures, pollutant sources, and discharge points to
determine if an illicit discharge has occurred or has the potential to occur. If violations are found , the
applicant will be notified verbally, via email and/or certified mail, depending on the severity of the
violations .both verbally * n repo. A compliance inspection then will be
scheduled no later than 14 days from the date of the violation .
If violations are not corrected by the time of the compliance inspection , and a schedule for compliance
is not being followed, escalating enforcement procedures shall be followed until the site reaches
compliance . This may include a formal Notice of Violation ( NOV) ,-and--the issuance of a Stop Work
Order;and holding all permits for the site ction activity will cease until violations
have been corrected . If violations continue to exist, judicial enforcement responses may be pursued
depending on the severity and recalcitrance of the violations . Refer to the Enforcement section below .
Indicator ( drive- by) inspections may be conducted at any time to assess site conditions._ . If the site
passes indicator inspections, routine i-n-spectio-n-s may occur less frequently . However, if violations are
found during indicator inspections, the applicant will be contacted to remedy the violations and to
schedule a follow- up compliance inspection .
When construction activity is completed , inspections shall occur at least every 90 days until the site has
reached final stabilization ,— and all temporary control measures have been removed ; and the CDPS
Construction Stormwater Permit has been terminated . If the contractor is no longer associated with the
site, the CDPS permit shall be transferred to the landowner, and the completed transfer shall be emailed
to Public Works . A final walkthrough will be performed to release the Grading Permit .
6. 2 . 5 . 2 Construction Enforcement
Upon finding a stormwater violation that does not require emergency suspension, the inspector will
verbally inform the owner and/or operator of the necessary corrective action . If the violation is
corrected during the inspection , no further action is required . For all remaining violations, on inspection
ceoort wi be mace avai ab e to tieemai the inspector will notify be send to the owner and/or operator
detailing the required corrective actions, and a follow- up compliance inspection will be scheduled .
Depending on the severity of the violation , alternatives to the follow- up compliance inspection may be
allowed , such as submitting photos of the corrective action . When the site reaches compliance , the
routine inspection frequency will resume .
If violations were not corrected by the follow- up compliance inspection , an written NOV will-will be
issued by certified mail, specifying a date by which compliance must be obtained to avoid further
enforcement action . An additional com " scheduled . If corrective actions are
found adequate during the compliance inspection , the routine inspection frequency will resume .
If the violations detailed in the NOV were not corrected by the specified date, additional NOVs may be
issued , in combination with additional enforcement actions, such as Stop Work Orders and placing holds
on permits .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 189
If compliance is not being achieved through previous methods, the Department of Public Works may
decide to pursue an administrative entry and seizure warrant for abatement in addition to any potential
civil and/or criminal enforcement . A hearing with the BOCC will be scheduled to assess the costs of the
abatement, and these costs will become a lien against the property from which the causes of violation
have been remediated .
Additionally, the County may, without prior notice , seek the suspension of MS4 discharge access, such
as issuing a Stop Work Order, to stop an illicit discharge or threatened discharge which presents, or may
present, imminent and substantial danger to the environment, to the health or welfare of persons or to
any MS4 or waters of the state . If the violator fails to comply with a suspension order issued in an
emergency, the Department of Public Works may take such steps as deemed necessary to prevent or
minimize damage to any MS4 or waters of the state . The BOCC may assess the costs of the abatement
and such costs will become a lien against the property from which the causes of violation have been
remediated . A person commits an offense if the person reinstates access to the MS4 without prior
approval of the Department of Public Works .
For more information on enforcement procedures, refer to Weld County Code Section 8 -9 .
6 . 2 . 6 MS4 Requirements for Post Construction
When developing a site within the MS4 area , stormwater drainage shall be treated by use of a
permanent water quality control measure prior to discharging into any MS4 . The MS4 Permit allows for
several exemptions; however, exemptions must be reviewed and accepted by Weld CountyPublic Works
staff prior to use .
6 . 2 . 6 . 1 Exemptions
The following exemptions are allowed in the MS4 area :
1 . Large - Lot Single - Family Sites : A single -family residential lot, or agricultural zoned lands, greater
than or equal to 2 . 5 acres in size per dwelling and having a total lot impervious area of less than
10 percent . A total lot imperviousness greater than 10 percent may be allowed when a study
specific to the watershed demonstrates the expected soil and vegetation conditions are suitable
for infiltrationf filtration of the WQCV for the site . The maximum total lot impervious covered
u nder this exclusion shall be 20 percent .
2 . Undeveloped Land : Sites with land disturbance to undeveloped land ( land with no human - made
structures such as buildings or pavement ) that will remain undeveloped .
3 . Above Ground and Underground Utilities : Activities for installation or maintenance of
u nderground utilities or infrastructure that does not permanently alter the terrain , ground cover,
o r drainage patterns from those present prior to the construction activity . This exclusion includes/
but is not limited to, activities to install/ replace, or maintain utilities under roadways or other
paved areas that return the surface to the same condition .
1--Above Ground and Underground Utilities :
•
•
or infrastructure that do not
the construction activity . This exclusion includes, but is not limited to, activities to install,
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 190
replace, or maintain utilities under roadways or other paved areas that return the surface to
the same condition .
2 . Large-Lot Single-Family Sites :
A sing c family resicential lot or agricultural zoned lancis ≥ 2 . 5 acres-in size per dwelling and
laving a total lot impervious area of less than 10 percent . A tota lot imperviousness greater
than 10 percent is allowed when a study specific to the wate
expected soil and vegetation conditions are suit
maximum total lot imperviousness covered under this exclusion will be 20 percent .
This list contains the most common exemptions, but other exemptions are listed in the MS4 Permit and
may be allowed . All exemptions will be approved on a case - by-case basis .
6. 2 .6 . 2 Permanent Water Quality Control Measure Design
Permanent water quality control measures must meet at least one of the " Base Design Standards"
detailed in the MS4 Permit . No exemptions or variances to the standards are allowed for applicable
development within the MS4 area . For the purposes of this section , the " permittee " is the landowner .
The following italicized " Base Design Standards" were excerpted from the MS4 Permit, and all
references made can be found within that document . The entire permit is available on the CDPHE
website .
1 . WQCV Standard
The control measure (s) is designed to provide treatment and/or infiltration of the WQCV and:
• 100 percent of the applicable development site is captured , except the permittee may exclude
up to 20 percent, not to exceed 1 acre of the applicable development site area when the
permittee has determined that it is not practicable to capture runoff from portions of the site
that will not drain towards control measures . In addition , the permittee must also determine
that the implementation of a separate control measure for that portion of the site is not
practicable ( e . g . , driveway access that drains directly to street) .
• The exclusion of up to 20 percent of the site will be approved only in extreme cases when other
forms of treatment are infeasible . Use of this exclusion will not be approved if flows can be
diverted to the main permanent water quality control measure, or a separate permanent water
quality control measure can be installed . It is the duty of the Engineer to demonstrate the
hardship and prove that alternative methods cannot be employed . Cost in this case is not
considered a hardship .
Evaluation of the minimum drain time shall be based on the pollutant removal mechanism and
functionality of the control measure implemented . Consideration of drain time shall include maintaining
vegetation necessary for operation of the control measure ( e .g . , wetland vegetation ) .
Most commonly, applicable development will require a detention pond , sized for the 100-year storm
event and releasing within 72 hours, for flood control purposes . Detention ponds designed to current
standards and rainfall data meet the WQCV Standard . However, if the site drains to a detention pond
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGL 191
designed under previous standards and/or rainfall data that do not meet the WQCV Standard , a new
permanent water quality control measure is required . Additionally, a permanent water quality control
measure is required even if a site qualifies for an exception to detention .
In order to show compliance with this design standard , the plan must detail the percentage of the site is
being captured and treated by the permanent water quality control measure . If there are any excluded
areas proposed , a hardship must be demonstrated . Public Works will assess these on a case- by-case
basis .
Examples of permanent water quality control measures meeting the WQCV Standard include detention
ponds ( with orifice plates ) , bioretention ( with underdrains ) , and sand filters ( with underdrains ) .
Calculations for the WQCV Standard can be found in the USDCM , Volume 3 .
2 . Runoff Reduction Standard
The control measure (s) is designed to infiltrate into the ground where site geology permits, evaporate, or
evapotranspire a quantity of water equal to 60 percent of what the calculated WQCV would be if all
impervious area for the applicable development site discharged without infiltration . This base design
standard can be met through practices such as green infrastructure. "Green infrastructure " generally
refers to control measures that use vegetation, soils, and natural processes or mimic natural processes to
manage storm water. Green infrastructure can be used in place of or in addition to low impact
development principles.
The Runoff Reduction Standard is most commonly used for sites qualifying for an exception to detention
or sites draining to a detention pond not which was not originallydesigned to meet the WQCV Standard .
Examples of permanent water quality control measures meeting the Runoff Reduction Standard include
grass swales, grass buffers, bioretention ( full infiltration ) , and sand filters ( full infiltration ) . Calculations
for the Runoff Reduction Standard can be found in the USDCM , Volume 3 .
3 . Applicable Development Site Draining to a Regional WQCV Control Measure
The regional WQCV control measure must be designed to accept the drainage from the applicable
development site. Stormwater from the site must not discharge to a water of the state before being
discharged to the regional WQCV control measure. The regional WQCV control measure must meet the
requirements of the WQCV Standard listed above.
The design engineer is encouraged to use guidance documents, spreadsheets and programs provided by
MHFD to assist in designing the BMPs. Other software programs may be used, but the designs will be
verified using the MHFD spreadsheets. The most current versions of MHFD spreadsheets can be
downloaded from the MHFD website at httpsaludfcd. orgjsoftware.
Control measure technology is changing constantly . Weld County will evaluate the use of newly
developed control measures on a case - by-case basis when complete documentation of all assumptions
is provided . Weld County reserves the right to review alternative methods and compare with other
commonly used approaches, including those discussed in the USDCM .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 192
6 . 2 .6 . 3 Certificate of Occupancy
Upon completion of the permanent water quality control measure, the applicant will submit an As- Built
Drawing, certified by a Colorado licensed Professional Engineer, of the permanent water quality control
measure and associated drainage features . An As- Built Drawing Checklist , can be found on the Public
Works, Development Review webpage or in Appendix D . Upon receiving the As- Built drawing, Public
Works will schedule an inspection of the permanent water quality control measure and associated
drainage features to visually confirm site conditions with the submitted drawing . If the inspector has no
concerns, the Certificate of Occupancy ( CO ) may be obtained . If not, the CO will be withheld until all
concerns are addressed . For redevelopment sites or sites in violation , an ` MS4 hold ' will be placed on
the parcel , under which no permits will be issued until MS4 requirements are met .
6 . 2 .6 .4 Release from Grading Permit
A site reaches final stabilization when all construction , paving, and landscaping is complete, and uniform
vegetative coverpecmanent stabilization has reached at least 70 percent permanent vegetative cover.
Upon achieving final stabilization of the site and release of the CDPS Construction Stormwater Permit, a
final inspection will be conducted to verify final site conditions with the previously submitted Site Plans
and As- Built Drawing . When confirmation is obtained , the site can be released from the Grading Permit .
If the inspector observes conditions other than in the approved documents, additional actions and/or
submittals may be required . Grading Permits may beare subject to a permit renewal fee after the first
6 . 2 .6 . 5 Long-Term Inspections of Permanent Water Quality Control Measures
Permanent water quality control measures and associated drainage features shall be routinely
maintained to function properly . Long-term operation and maintenance of the permanent water quality
control measure will be verified by an annual inspection or at a rate determined by Public Works staff,
not to exceed five years .
If the volume capacity of the permanent water quality control measure cannot be visually verified , such
as with a concrete trickle channel or other structural marker, Public Works may require a survey to be
completed by a Professional Land Surveyor. Confirmation of the volume capacity will be confirmed in a
report stamped by a Colorado licensed Professional Engineer. The survey and report will be
submittedmay be required every five years .
Upon change in ownership, the new landowner will be responsible for the proper operation and
maintenance of the control measure . O & M Plans may be updated at any time by contacting the Public
Works Department .
6 . 2 .6 . 6 Post- Construction Enforcement
When a violation is determined by an inspection , the owner will be notified either informally or formally
based on the severity of the violation . Informal notification may be verbally communicated , and--or a
written notice will be sent, usually by email_; for re-co-rekee i-Fig purposes . If corrective actions are made
within a reasonable amount of time, no further action is required . If corrective actions are not made
within an agreed - upon schedule, a formal NOV will be issued by certified mail . Additionally, an NOV may
be issued if violations are severe or occur repeatedly at the site . If corrective actions are not made
within the specified amount of time, the an ` MS4 hold ' will be placed on the parcel . Additionally, a
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 193
hearing may be scheduled with the BOCC . If an illicit discharge has occurred or will likely occur, the
Department of Public Works may take immediate action in cleaning up or preventing the contaminant
from discharging into the MS4 . Specific details concerning enforcement can be found in the Weld
County Code .
6 . 2 . 7 MS4 Requirements for As- Built Drawing Checklist
The purpose of this checklist, provided in Appendix D, is to assist the applicant in submitting the
required As- Built Drawing for site drainage features ( ponds, swales, inlets, outlet structures, spillways,
etc . ) implemented within the MS4 area , This checklist is provided in Appendix D . As- Builts are typically a
red - lined copy of the original plans, clearly depicting all changes made in the field . Elevations shown in
the plans shall be verified through survey . Materials, dimensions, pond capacity and other aspects of
the design shall be verified by the engineer . Additional sheets may be added to the As- Built Drawings if
there is not enough room on the original plan .
6 . 3 REVEGETATION
Guidelines for revegetation in Weld County are provided in the Weed Management section of the Weld
County Public Works website . For more information regarding revegetation , refer to the Revegetation
chapter of the USDCM , Volume 2 , and the Temporary and Permanent Seeding Fact Sheet ( EC-2 ) of the
USDCM , Volume 3 .
6 . 3 . 1 Site Preparation
An initial evaluation of site conditions is necessary for successful revegetation . Site preparation activities
should include, at a minimum :
• Initial hydrologic evaluation
• Initial weed evaluation and control
• Topsoil preservation ( including existing wetland soil )
• Soil testing
• Soil amendment
• Seed bed preparation
• Tree protection
A list of noxious weeds is provided in Chapter 15 , Article I of the Weld County Code . In the case that
noxious weeds exist onsite, the appropriate steps need to be taken before , during, and after work is
completed to control their spread .
Soil amendments may be needed to improve the existing soil conditions prior to revegetating the site .
Recommendations for soil amendments are provided in the Revegetation chapter of the USDCM ,
Volume 2 and include , but are not limited to, fertilizers, compost, peat, humates, sulfur, gypsum , lime ,
wood chips, and soil micro -organisms .
For disturbance of soils within the Weld County right-of-way, soils should be tested to determine
requirements for fertilizing and conditioning . Based upon the test results, hydraulic growth medium
( HGM ) may be required . Contact Public Works for fertilizer and HGM requirements .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 194
6 . 3 .2 Seeding and Planting
In addition to the site preparation guidelines outlined in the Revegetation chapter of the USDCM ,
Volume 2, seed mixtures should be coated with Mycorrhiza at the rate of 2 pounds per acre at the time
of seeding . The Weed Management page of the Weld County Public Works website provides
recommended seed mixes for use within Weld County . The design engineer is encouraged to work with
Weld County Public Works in selecting a suitable seed mix .
The two applicable seeding styles in Weld County are drill seeding and broadcast seeding . Drill seeding
involves placing the seed in a firm seed bed just under the surface, which provides the best seed -to -soil
contact and yields higher success rates . Typical application for this method uses 11 pounds to 14 pounds
of pure live seed ( pls ) per acre . Broadcast seeding involves placing the seed directly to the surface of the
soil , and typically uses 20 pounds to 24 pounds pls per acre . Ideal seeding dates are from April 1, or
spring thaw, to June 15 and from September 15 until consistent ground freeze for non - irrigated areas .
Winter and early spring seeding should not be conducted if the soil is frozen , snow covered , or wet
( muddy) . Hydro -seeding will be approved by Weld County only on a case - by-case basis . In order for a
project to come to completion , it will be required that the project site achieve 70% plant density during
full growing season .
6 . 3 . 3 Mulching
Mulching is the practice of applying a protective layer of material onto the soil surface of plantings or a
seeded area . Mulching may be achieved through straw or rolled erosion control product ( RECP )
installations . If mulching with straw, the straw must be certified weed -free . Mulching will not be
conducted in wetland areas . Hydromulch will be approved only on a case- by- case basis .
6 . 3 .4 Maintenance
A maintenance and management plan should be established for each project to ensure successful
revegetation post-construction . Recommended maintenance activities include, but are not limited to :
• Weed control and long-term management
• Reseeding bare areas where grasses did not establish
• Repairing erosion control fabrics, if applicable
• Stabilizing eroded areas, particularly following large storm events
• Installing protection from animal damage
• Temporary or permanent irrigation , as needed
• Removing debris
• Installing and/or repairing temporary fencing to control foot traffic, particularly in heavily used
park areas
Wetland areas usually require specific post-construction monitoring as part of the Clean Water Act
Section 404 permitting process . These requirements should be coordinated with Weld County Public
Works . Refer to the Revegetation chapter of the USDCM , Volume 2 for more information .
The property owner/developer is fully responsible for site maintenance and revegetation .
WELD COUNTY ENGINEERING 81. CONSTRUCTION CRITERIA PAGE 195
6 . 3 . 5 Erosion Protection Design Criteria
Protecting major drainage channels from erosion is critical for maintaining channel stability . Channels
need to be designed so that they remain stable until they are fully constructed or vegetated . It may be
necessary to install riprap, straw bales, erosion control logs, or erosion control blankets in the channels
to ensure that they remain stable . The BMPs outlined in the USDCM , Volume 3 , shall be used to ensure
stability .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 196
CHAPTER 7 FEMA FLOODPLAIN REQUIREMENTS
For All any construction development, as defined by FEMA, in a floodplainshall comply with, all
applicable floodplain regulations and codes apply, including the need to submit a CLOMR and a LOMR to
FEMA for review and acceptance if applicable . For more information regarding floodplain regulations,
refer to Chapter 23 , Article XI , of the Weld County Code; the 2011 2022 Colorado Water Conservation
Board ( CWCB ) Rules and Regulations for Regulatory Floodplains in Colorado; and Title 44 Code of
Federal Regulations ( CFR ` 59 , 60, and 65 of the FEMA' s National Flood Insurance Program ( NAP )
regulations .
Floodplain - related work will be reviewed by the Weld County Planning Department of Planning Services
and a permit will be issued for all compliant submittals . the Weld County Floodplain Administrator . For
more information regarding floodplain modeling and mapping requirements : refer to FEMA' s Guidance
for FEMA 's Risk Mapping, Assessment and Planning . Guidelines and Specifications for Flood Hazard
Mapping Partners .
7 . 1 BACKGROUND INFORMATION
Weld County is a participant in FEMA' s National Flood Insurance Program NFIP) therefore . As a
participant in the NAP, Weld County is responsible for ensuring that floodplain regulations per FEMA,
the state of Colorado , and Weld County are administered . Failure to administer
the floodplain regulations can result in the suspension of Weld County from the NFIP . Suspension from
the NFIP results in the inability of Weld County residents to obtain flood insurance and the suspension
of disaster assistance funding from FEMA in the event of a natural disaster .
7 . 2 FLOODPLAIN MANAGEMENT OBLIGATIONS
Weld County has several cases that govern many of the requirements set forth in this WCECC :
• The boundaries of the floodplain should be accurately determined and based on a reasonable
standard . Mallett v. Mamarooneck, 125 N . E . 2d 875 ( N . Y . 1955 ) .
• Adoption of a floodplain regulation to regulate flood - prone areas is a valid exercise of police
power and is not a taking as long as the regulation does not go beyond protection of the public' s
health , safety, morals, and welfare . Hermanson v. Board of County Commissioners of Fremont,
595 P . 2d 694 ( Colo . App . 1979 ) .
• The adoption by a municipality of floodplain ordinances to regulate flood - prone areas is a valid
exercise of police power and is not a taking . Morrison v. City of Aurora, 745 P . 2d 1042 ( Colo .
App . 1987 ) .
7 . 3 FEMA FLOODPLAINS
There are several hundred square miles of FEMA mapped floodplains in Weld County . Refer to the Flood
Insurance Rate Maps ( FIRMs ) anc F ooc Boundary and F oodway Maps ( FBFMsr that are published by
FEMA to determine if a proposed project is located within a mapped floodplain . The floodplain maps can
be obtained from the FEMA Flood Map Service Center and the floodplain boundaries are depicted on
the Property Portal Map maintained by Weld County . The Weld County Department of Planning Services
and Zoning Department should be contacted to determine if there have been any LOMRs or other
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGI 197
changes to the floodplain boundaries that have been approved by FEMA for the affect the proposed
project area .
7 . 3 . 1 Floodplain Requirements
All development, as defined by FEMA, requires a Floodplain Permit H--) ) or Floodplain Development
Permit ; FHDP ) from Weld County . The applications can be found on Weld County' s Planning and Zoning
website . Contact the Weld County Department of Planning Servicesand Zoning to determine which
application is required . The designer should also should be aware that the CWCB requires a CLOMR and
LOMR should there be are required if there is an increase greater than 0 . 00 feet or a decrease in WSEL
greater than 0 . 3 feet in regulatory floodwaysplains . A CLOMR and a LOMR are also required if there is an
increase or a decrease greater than 0 . 3 feet in the WSEL in regulatory floodplains .
Sections 4 . 7 and 5 . 7 of this WCECC discuss the criteria for constructing hydraulic structures within an
open channel . All design engineering of the hydraulic structures must follow accepted FEMA
methodology . Construction of hydraulic structures within FEMA floodplains must not increase the
:: WSEL for Zone A or Zone AE . Per FEMA regulations, a Floodplain Development Permit ( H IDP ) shall
be required for the construction of channels and other major drainage system components within the
FEMA mapped 100 year floodplain . It may be necessary to submit a CLOMR and a LOMR
followed by a LOMR to FEMA as part of the development process .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 198
CHAPTER 8 TRAFFIC CRITERIA
This Chapter discusses the requirements for developing and submitting Traffic Impact Studies, traffic
control devices, access to county roads, access design , auxiliary lane requirements, access construction
within County right-of-way, and tracking control standards .
8 . 1 TRAFFIC IMPACT STUDIES
A Traffic Impact Study (TIS ) is required to analyze the effects of a proposed development or other land
use action on the transportation system to determine if adequate public facilities exist to serve the
proposed development, and to clearly identify any improvements required to mitigate the impacts on
the transportation system .
When a plan for development or redevelopment is submitted , the applicant is responsible for assessing
the traffic impacts of the additional traffic to the surrounding transportation system under existing
( current ) , short- range and long- range horizons .
If a project is adjacent to a road that is under the jurisdiction of another entity ( CDOT, City, Town , or
adjacent County) , the applicant is responsible for contacting that entity to determine the traffic analysis
and access approvals that may be required . Any proposed access to a State Highway will require a CDOT
Access Permit and direct coordination with CDOT.
8 . 1 . 1 Traffic Impact Study Area
Traffic impacts shall be analyzed within the traffic impact area . The determination of a traffic impact
area is done on a case- by-case basis; however, at a minimum the limits of the study should include :
1 . Internal roads .
2 . Adjacent roads .
3 . Access locations and/or new intersections .
4 . Off-site roads to the nearest paved County collector or arterial road or state highway .
5 . Off-site roads where traffic from the proposed development or land use action will account for
at least 20 percent of the average daily traffic upon build -out .
6 . Off-site intersections where traffic from the proposed development or land use action :
a . Contributes a 10- percent impact of the peak hour traffic on any approach leg of an
intersection where the intersection is operating at a level of service ( LOS ) C or better
upon build -out .
b . Contributes a 5 - percent impact of the peak hour traffic on any approach leg of an
intersection where the intersection is operating at a LOS D or worse upon build -out .
c . Impacts a specific turning movement that currently does not have an auxiliary turn lane
by at least 50 percent of the peak hour volume warrant for an auxiliary turn lane .
8 . 1 . 2 Preliminary Traffic Impact Analysis
A preliminary traffic impact analysis (traffic narrative ) shall be submitted with every project application
for the application to be considered complete . The intent of the analysis is to determine the project' s
cumulative development impacts, appropriate project mitigation and improvements necessary to offset
a specific project' s impacts . This analysis shall include the following information :
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 199
1 . Describe how many roundtrips/day are expected for each vehicle type : Passenger Cars/ Pickups,
Tandem Trucks, Semi -Truck/Trailer/RV ( Roundtrip = One trip in and One trip out of a site ) .
2 . Describe the expected travel routes or haul routes for site traffic .
3 . Describe the travel distribution along the routes ( e . g . 50 percent of traffic will come from the
north , 20 percent from the south , 30 percent from the east, etc . ) .
4 . Describe the time of day that you expect the highest traffic volumes .
Public Works will review the narrative and advise the applicant if more information or an engineered
traffic impact study is required .
8 . 1 . 3 Traffic Impact Study Requirements
A full TIS is required for any proposed development or land use zoned Commercial or Industrial , any
residential subdivision greater than nine ( 9 ) lots, or when determined necessary by the Engineer . The TIS
should address impacts to on -site and off- site roadways and highways within the County and shall be
prepared , stamped , and signed by a Professional Engineer licensed in the state of Colorado . The TIS shall
include, at a minimum , the following information :
1 . Describe the traffic impact area , including at a minimum those elements described in the traffic
impact study area section of this document .
2 . A location map showing the development site, the boundaries of the traffic impact area , and all
roads, intersections, bridges, or other roadway structures in the traffic impact area .
3 . Define the following study horizons for the Full Traffic Impact Study : the existing ( current ) ,
short - range, and long- range horizons .
a . Existing Horizon : The intent is to establish a baseline traffic condition .
b . Short- Range Horizon : The intent is to evaluate the immediate impacts of the project on
the transportation system . The short- range horizon year is defined as the point of full
buildout of the proposed development or land use action . If the project is proposed to
occur over multiple phases, the impacts shall be analyzed at the point of full buildout of
each phase . In no case shall the short- range horizon exceed five ( 5 ) years .
c . Long- Range Horizon : The intent is to evaluate the impacts of the fully developed project
in the context of regional transportation planning efforts . The long- range impacts are
analyzed as of the end of the current Regional Transportation Plan 20-year planning
horizon .
4 . Identify the existing, approved , and proposed land uses within the traffic impact area .
5 . Describe existing traffic conditions within the traffic impact area , including average daily traffic
volumes for roadways and impacted intersections and a . m . and p . m . peak hour levels of service
for intersections .
a . Existing daily traffic data must be obtained from the Department of Public Works . If the
data are not available for the area in question or data is outdated ( older than 24 months
for daily counts or 12 months for intersection counts ) , then the designer may obtain
new traffic data . Daily traffic counts must be collected over a 72 - hour period starting on
a Tuesday and ending on a Thursday of a normal week, excluding any holidays or events
that may skew results . Daily traffic counts must have been collected within the past 24
months . Intersection turning movement counts must be collected for at least two hours
each of the morning and evening peak hours of a typical weekday (Tuesday,
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1100
Wednesday, or Thursday) and must have been collected within the past 12 months .
Existing daily roadway and intersection peak hour traffic counts must be included for
the study area . Any traffic counts collected for the study should be included in Appendix
I .
6 . For short- range traffic projections, provide references, calculations, and data sources for all trip
generation estimates . The trip generation results shall be shown in a table with the following
information :
a . Land Use
b . Unit of Measurement ( for example, per dwelling unit, per 1 , 000 s . f. sq . ft ., etc . )
c . Total number of units
d . Trip generation rates per unit for average daily traffic and peak hour volumes
e . Total number of trips generated for average daily traffic and a . m . and p . m . peak hours
7 . Short- range and long- range traffic projections must also include forecasts for the growth in
background traffic
8 . Provide trip distribution estimates for the roads and intersections in the traffic impact area
based on the following :
Tables in the report need to show the trip generation rates used , based on the most recent
version of the Institute of Transportation Engineer' s Trip Generation Manual.
If no Trip Generation Manual information is available, the site -specific number of trips can be
calculated based on the number of employee trips for each shift time, number of deliveries,
additional trips entering/exiting, and other applicable trips that may enter and exit the site
throughout a typical day .
a . Vehicle Types
The number or percentage of anticipated trucks should be included in the trip
generation . In the analysis, a Passenger Car Equivalent ( PCE ) should be used to account
for slower- moving trucks in the traffic stream . The procedures for converting trucks to
PCEs can be found in the latest edition of TRB' s Highway Capacity Manual or in the
CDOT State Highway Access Code .
If a haul route is associated with the development, the route should be called out in the
report .
b . Trip Distribution
The directional analysis for the site -generated traffic should be presented clearly . If
internal trip reductions or pass- by trips are used in the calculations, they must be clearly
documented .
c . Total Proposed Volumes
The total proposed trips and corresponding turning movement counts should be clearly
shown for both the short- range horizon ( project opening year) and for the long- range
horizon ( 20-year planning horizon ) .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1101
9 . Present the volumes for short - range and long- range traffic including the projected traffic for the
proposed development or land use action for the a . m . and p . m . peak hour and average daily
conditions . These volumes must include turning movements at intersections as well as volumes
for roads in the traffic impact area .
10 . Analyze the adequacy of the transportation system to handle the projected traffic for short-
range and long- range planning years . Key elements in this analysis should include :
a . Generalized daily traffic volume level of service for roadways and intersection levels of
service for a . m . and p . m . peak hours, based on the following guidance :
The LOS must be analyzed at each intersection within the study area . For unsignalized
intersections, the worst- movement approach must be reported . The County has
e stablished LOS C as the minimum acceptable threshold at both signalized and
u nsignalized intersections . If LOS C cannot be achieved in the existing, opening year, or
horizon year analysis, mitigation should be recommended and documented .
The existing peak hour LOS and delay calculations should be based on the procedures
outlined in the latest edition of the TRB ' s Highway Capacity Manual. Typically, the
weekday morning and evening peak hour will be used for analysis, but if the site' s peak
hours are anticipated at other times of day, the proposed peak hours of analysis should
be approved by the County .
The following traffic analysis scenarios must be included :
• Existing ( Current ) Year, without project
• Short- Range Analysis, Project Opening Year with Project Traffic
• Long- Range Analysis ( 20-year planning horizon ) without Project ( Background Traffic )
• Long- Range Analysis ( 20-year planning horizon ) with Project
If the project is proposed to open in phases, the analysis of multiple opening year
scenarios may be required . An additional Background Traffic Project Opening Year
scenario may be required if background traffic volumes are anticipated to be
significantly higher than under Existing Year conditions .
Each analysis scenario should be presented clearly, with graphics showing the proposed
access locations, assumptions used for trip distribution , trip assignment, intersection
turning movements, daily traffic volumes, and LOS . Any existing or background
intersection or roadway operational and geometric deficiencies in the study area should
be clearly noted .
b . The appropriateness of access locations and if necessary, a traffic signal warrant
analysis .
Requirements for access spacing are included in Section 8 . 5 . All existing and proposed
intersections within the study area should be assessed to determine if spacing criteria
are met .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1102
If an intersection within the study area may be signalized , a traffic signal warrant
analysis should be performed based on the warrant criteria in the latest edition of the
MUTCD . Both the opening year and horizon year conditions should be evaluated to
determine if the intersection may meet warrants .
c . The need for auxiliary lanes ( turn lanes, deceleration , and acceleration lanes ) , including
explanations of how acceleration/deceleration lengths, storage lengths, and taper
lengths were determined .
Requirements for auxiliary lanes are included in Section 8 . 7 and are based on the CDOT
State Highway Access Code Rural Highway ( Category R- B ) classification requirements . If
the roadway has characteristics differing from a Rural Highway, the designer should
refer to the Access Code to utilize a more appropriate classification to calculate auxiliary
lane needs . All intersections and site access points within the study area should be
evaluated to determine if auxiliary lane warrants are met . If auxiliary lanes are in place ,
the study should determine if the storage length , taper length , and
deceleration/acceleration lane distances meet minimum requirements with the added
site traffic .
d . Sight Distance
All site accesses should be evaluated to ensure sight distance minimum requirements
are met based on the requirements in Section 8 . 6 . If applicable , the study should
evaluate if changes to passing zones are recommended in the vicinity of the site due to
the proposed development .
e . Crash History
A crash history and safety analysis may be required if the site is proposed to access a
location where the County has identified a safety concern . Consultants may need to
purchase third - party software , such as DiExSys, to analyze the safety performance
functions of a location based on existing and proposed new traffic . If a location is found
to perform at a level of service of safety greater than 3 , then improvements must be
determined to reduce the level of service of safety . Weld County will accept locations
that have a level of service of safety of 1, 2 , or 3 .
f. Sites Accessing Gravel Roads
If the site is proposed to access gravel roads, an assessment should be performed to
determine if development of the site requires consideration of paving the road . See
Section 8 . 9 for Tracking Control requirements .
g . Parking Needs
For non - residential development, ensure that the site has adequate on -site or on-street
parking available .
h . Safe Routes to School and/or School Bus Stops
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA F A G h 1103
For residential development, identify existing or proposed school bus stops within the
study area , existing and proposed sidewalks, and note any deficiencies and proposed
improvements .
i . Access to Public Transit
If there is public transit within the study limits, identify accessibility to public transit and
safe pedestrian/ bicycle access to the nearest transit stop within half a mile of the
project site .
j . Haul Route
If applicable , the site' s proposed haul route should be identified . Any deficiencies along
the haul route ( such as pavement, bridge deficiencies, etc . ) must be called out along the
haul route , even if it is outside of the project study area .
11 . Provide a summary of conclusions and recommendations from the full Traffic Impact Study,
including at least the following items :
a , A summary listing of traffic impacts from the proposed development on existing and
proposed roads and intersections within the traffic impact area .
b . A summary listing of the improvements needed to assure adequate service and safety
levels on the roadway system affected by the proposed development, identify and
describe each proposed improvement, how and when it will be funded , and expected
completion dates .
i . The TIS should clearly state recommended improvements to the site accesses,
intersections, and roadway system for the short- range and long- range years .
Include any auxiliary lane recommendations, modifications to existing storage
bay lengths, intersections recommended to be signalized , proposed turning
restrictions at intersections or access points, modifications to roadway surface ,
or improvements required along the roadway .
ii . An updated LOS analysis should be performed where mitigation is
recommended to ensure that acceptable operations can be achieved for both
short- range and long - range conditions .
iii . Identify and describe each proposed improvement, how and when it will be
funded , and expected completion dates .
12 . Any reasonable additional information deemed necessary for review—special considerations .
Public Works will review the TIS and advise the applicant if more information is needed or
provide technical comments on the submittal .
8 . 1 .4 Traffic Impact Study Checklist
A stand -alone checklist will be provided to developers along with the Pre -Submittal Requirements
packet and found in Appendix I of this document .
8 . 1 . 5 Updating Existing Traffic Impact Studies
The following scenarios will require the preparation of an update ( or amendment ) to a previous study,
or the preparation of an entirely new study .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 104
1 . When the time or circumstances of the original study fall within the parameters presented in
Table 8- 1, the applicant shall prepare the appropriate documentation identified in Table 8- 1 .
2 . When the original study was prepared for a large, complex, or phased project and was designed ,
organized , and written to function as a " base" or master plan document for future development
applications, it must include updates to the County comprehensive plan . (These types of studies
require scoping consultation with the County prior to their preparation . )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1105
Table 8-1 Updating Gnarl Existing TIS
Changes to the Original Development
Access changed , or trip generation Access did not change, and trip generation did
Original Report is :
increased by 15% or more not increase by 15 % or more
Amendment letter : identify and Letter documenting change ; include level of
< 2 years old service
discuss only items that changed
( No other traffic requirements )
Amendment letter, including :
• Updated traffic counts ( daily counts
taken over 72 hours )
> 2 years old New study • Revised trip g eneration
• Revised LOS analysis
• Meet all current TIS requirements
8 . 2 CHANGE IN ACCESS USE
if the use of an existing access to County right-of-way changes or there is a change in the use of the
property, a new Access Permit will be required , in accordance with Chapter 8, Article 14 of the Weld
County Code . Change in access or property use may include , but is not limited to , change in the amount
or type of traffic, structural modification , remodeling, change in use or type of business, expansion of
existing business, change in zoning, change in property division , and creation of new parcels .
8 . 3 TEMPORARY ACCESS
Any road access that will be closed after being used for a limited time may be considered a temporary
road access, or a road that will be temporarily used for a different purpose may be considered a
temporary upgrade in use . The time in use of temporary accesses will not exceed 18 months . A
Temporary Access Permit may be granted only if the temporary access meets minimum County traffic
safety and operational requirements ( Weld County Code Sec . 8 - 14- 10, et seq ) , including sight distance
and tracking control that is discussed in further detail in Section Error ! Reference source not found . 83.
For a Temporary Upgrade in Use Access Permit, the access must meet prior use standards and
regulations including use, width , and turning radii after the permit expires .
8 .4 TRAFFIC CONTROL DEVICES AND PLANS
All road signs, striping, delineators, barricades, signals, and other traffic control devices will conform to
the most current edition of MUTCD and any applicable Colorado supplement, as amended . The
applicant will be required to install all necessary signage and will bear all expenses for the fabrication
and installation of road name signs, permanent barricades, and signs for implementing the approved
project design ( e . g . , one way, no parking, no outlet, stop sign , speed limit ) . Necessary signage will
include signs required on County roads as a consequence of the applicant' s project, such as regulatory,
guide , or warning signs . Signs and barricades will be in place prior to road acceptance .
8 .4 . 1 Signage and Striping Plans
All road improvement and/or land development projects must incorporate a separate signage and
striping plan in accordance with the criteria of this section . Striping plans may not be required for local
subdivision roads . However, sign plans are still required for all subdivisions . All signing and striping plans
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1106
will conform to the most current edition of the MUTCD . All traffic control devices will be fabricated and
installed in accordance with the MUTCD . Permanent signage and striping will be complete and in place
before any new roadway is opened to the public for use .
8 .4. 1 . 1 Signage Plan Elements
1 . Show the general longitudinal location of each sign ( horizontal offset and station ) .
2 . Specify the sign legend and sign type .
3 . Specify the sign size .
8 .4. 1 . 2 Striping Plan Elements
1 . Include stripe color and type .
2 . Include lane width , taper lengths, storage lengths, etc .
3 . Include striping/skip interval .
4 . All permanent pavement marking materials, except point location markings, must meet current
CDOT specifications for thermoplastic traffic marking paint unless another material is specified
by the engineer and approved by the County .
S . All point location markings ( stop bars, turn arrows, words, symbols, etc . ) must meet
specifications .
6 . Include station and offset or dimensions for all angle points, symbol locations, and line
terminations .
7 . Include stripe dimensions .
8 . Delineate raised median islands .
8 .4.2 Striping guidance
A stop line ( stop bar) should be placed a minimum of 4 feet in advance of the nearest crosswalk line at
controlled intersections . In the absence of a marked crosswalk, the stop line should be placed at the
desired stopping point but should not be placed more than 30 feet or less than 4 feet from the nearest
edge of the intersecting traveled way . Preferred distance is 10- 12 feet from edge of traveled way .
8 .4. 3 Type and Location of Signs
The Department of Public Works will make the final determination regarding the type and location of
traffic control devices within the right-of-way or access easement . These controls will include traffic
control signs, road name signs, delineators, and permanent barricades .
8 .4.4 New Roadway Signage
Permanent signage, unless otherwise approved by the Department of Public Works, will be installed
before any new road or access easement is opened for use .
8 .4. 5 Memorial Sign Applications
A memorial sign must be requested by the victim ' s family or another sponsor with the consent of the
victim ' s family, in accordance with Weld County Code, Chapter 8, Article VI , Sec . 8-6- 180 . Upon
submittal of a Roadside Memorial Sign Application with fee to the Weld County Public Works
Department, Public Works will review the application for acceptance . See also Appendix 8 - L and 8- M of
the Weld County Code .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1107
8 .4.6 Construction Criteria
Refer to Section 10 . 9 . 1 and Section 10 . 9 . 2 for more - detailed information on construction criteria of
pavement marking and traffic control devices .
8 . 5 ACCESS POINTS
The Weld County Code defines an access as the place , means . or way vehicles or pedestrians shall have
safe , adequate and legal ingress and egress to a lot, trail , open space , off-street parking space or use .
Weld County recognizes that property owners have a right of reasonable access to the County road
system . However, within an environment where population growth will increase traffic volumes and
operational pressure on the general transportation system , be it rural or urban , access control is crucial
to protect the public health , safety, and welfare . Access control is used to maintain smooth traffic flow,
to provide road right- of-way drainage , and to protect the functional level of the County roads while
meeting state , regional , local , and private transportation needs and interests . Weld County Code Sec . 8-
14- 10, et seq ., contains the County' s Road Access Policy . Also refer to the Weld County Functional
Classification Map and Transportation Plan , available on the County' s Transportation Planning webpage .
An access permit application must be submitted for any new proposed access to a County- maintained
road . If a property is proposed to directly access a State Highway, access must be approved and
obtained by CDOT as described in Section 8 . 3 . 1 . 1 . a . If a property is proposed to directly access a road
under the jurisdiction of a local municipality, access must be approved and obtained by the local
municipality .
If a property has frontage on two roads, it is recommended access should be obtained from the lower
volume road when possible .
Intersection and aAccess spacing criteria ( as measured from centerline to centerline right _of _way to
right _of _way ) for local roads, collector roads, and arterial roads are shown in Table 8- 2 .
Table 8-2 Minimum Intersection & Access Spacing Criteria (feet)
Access Element Arterial Collector Local
Distance between intersections
Signalized 2, 640 N /A N/A
Unsignalized 1, 320 1, 320 330
Distance between access points and intersections 660 660 330
Distance between access points 660 330 150
Distance between access points in Subdivisions NJA N/A 75
If design criteria cannot be met for auxiliary lane requirements or if an operational threshold of LOS C
cannot be maintained , the proposed access may be approved as restricted movement, as described in
Section 8 . 5 . 6 .
8 . 5 . 1 Local Roadways
Access standards to local roadways will be governed by Weld County recognizinge-s that property
owners have a right of reasonable access to the County road system . However, within an environment
where population growth will increase traffic volumes and operational pressure on the general
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1108
transportation system , be it rural or urban , access control is crucial to protect the public health , safety,
and welfare .
Access control is used to maintain smooth traffic flow, to provide road right-of-way drainage, and to
protect the functional level of the County roads while meeting state, regional , local , and private
transportation needs and interests . Weld County Code Sec . 8- 14- 10, et seq . , contains the County' s Road
Access Policy . Also refer to the Weld County Functional Classification Map and Transportation Plan,
available on the County' s Transportation Planning webpage .
Whenever possible, shared accesses will be given priority .
8 . 5 .2 Collector Roadways
Access standards to collectors are shown in Table 8- 2 . An access or new intersection onto a collector is
not permitted unless it meets the spacing requirements in Table 8 -2 and an alternative access or
intersection to a lower classified road is not feasible . No more than one access will be allowed to an
individual or to contiguous parcels under the same ownership unless it can be shown that the additional
access would not be in conflict with local safety regulations; the additional access would not be
detrimental to public health , safety, and welfare ; and the additional access is necessary for the efficient
use of the property .
8 . 5 . 3 Arterial Roadways
Access standards onto arterial roadways are shown in Table 8-2 . An access or new intersection onto an
arterial is not permitted unless an access/intersection to a lower classified road is not feasible and the
proposed access meets the spacing requirements in Table 8-2 and does not interfere with the location ,
planning, and operation of the general street system or access to nearby properties . Whenever possible ,
shared accesses will be given priority . No more than one access will be allowed to an individual or to
contiguous parcels under the same ownership unless it can be shown that allowing only one access
would be in conflict with local safety regulations; the additional access would not be detrimental to
public health , safety, and welfare ; and the additional access is necessary for the efficient use of the
property . Intersections will be spaced no less than one -quarter mile apart on arterials, unless such
spacing is impractical or impossible due to topographic or other physical limitations as determined by
the Department of Public Works . The type of access —full movement, three-quarter movement, or right-
in/ right-out movement — will be determined by the Department of Public Works .
8 . 5 .4 State Highway and Interstate Systems
CDOT and FHWA rules and regulations will apply to all highway and interstate accesses . Weld County
takes no jurisdictional authority over access onto a highway or interstate .
8 . 5 . 5 Shared Accesses
Whenever possible and feasible, shared access will be provided to serve two or more adjacent
properties . A s-Shared access is to be centered on the common property line . For shared accesses, the
County strongly recommends the property owner establish a written access
road maintenance agreement so future owners of the properties will be aware of their requirements for
shared maintenance of the access road . Shared access and utility easements shall be a minimum of 30
feet wide and shall contain a minimum 20-foot-wide, all -weather roadway .
WELD COUNTY ENGINEERING 8z. CONSTRUCTION CRITERIA PAGL 1109
8 . 5 .6 Restricted Movement Access
If the minimum spacing criteria cannot be met, or if the minimum level of service threshold of LOS C
cannot be achieved , the County may require that the movements at an access be restricted to ensure
traffic safety . The following types of access are most common :
1 . Full movement access . All potential movements for the access are allowed .
2 . Three-quarter access . All movements are allowed except a left turn out of the access .
3 . Right- in/ right-out access . Only right turn in and right turn out movements are allowed .
8 . 5 . 7 Access Control Plans
On corridors with an adopted Access Control Plan in effect, recommendations for each existing and
future access location and policies that guide future access management efforts will be enforced .
8 . 6 ACCESS DESIGN
Access points will be designed to provide safe movement for traffic entering and traveling on roadways
within the County . Like intersections, access points are conflict locations . The basic design of access
points includes adequate spacing, proper alignments, and clear sight distances .
8 .6 . 1 Geometric Design
Accesses shall enter onto Weld County roads at an 80- to 100-degree angle, for a minimum of one
vehicle length . An access approach that is gated will be designed so that the longest vehicle ( including
trailers ) using the access can completely clear the traveled way when the gate is closed . In no event will
the distance from the gate to the edge of the traveled surface be less than 35 feet . Any overhead entry
structures shall have at least a 14-foot, 6- inch clearance , measured from the access surface . When the
access is intended for commercial or industrial use, the access radii shall accommodate the turning
movements of anticipated vehicle types . AutoturnTURN exhibits may be required by the County if there
is a safety or operational concern . Table 8- 3 shows the access width and access radii for properties
based on land use .
Table 8-3 Access Geometry
Type of Land Use Maximum Access Width at ROW Access Radii
Single-family residential 24 feet wide 25 feet minimum
Commercial/ Industrial/Agricultural 40 feet wide 65 feet minimum
Fill slopes and cut slopes will be constructed to match the slopes of the existing County road adjacent to
the maximum access width as identified at the ROW line . It is desirable that all side slopes be no steeper
than 4 : 1 ( H :V ) . Drainage culverts are required for new access points unless otherwise approved by the
County . Minimum required size is a 15 - inch aluminized CMP or RCP . See Section 5 . 8 . 3 of this document
for allowable culvert types . Minimum cover requirement will be 12 inches above the pipe crown to the
bottom of asphalt at the edge of pavement ( for paved roads ) and a minimum of 12 inches of cover
above the pipe crown to the top of the finished grade ( for gravel roads ) . All culverts should be sized to
convey the flow water based on the existing capacity of the ditch and meet the HW/ D requirements
specified in Chapter 5 of this document . Figure 8 - 1 shows a typical access approach . Dimensions of
radius and access width should be determined by Table 8-3 , above .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1110
Figure 8-1 Access Approach
I I
I I
15" MINIMUM i I FLARED END
DIA. CULVERT ACCESS WIDTH / SECTIONS
- _ - - RIGHT OF WAY
-► - t- - I. FLOW LINE
GRAVEL OR
PAVED SURFACE SHOULDER
RADIUS AS REQUIRED
EDGE!OFTRAVEL-LANE
c. WELD COUNTY ROAD
8 . 6 . 2 Access Sight Distance
Accesses are stop controlled so the access sight distance discussed in this section is the distance
required for vehicles to enter traffic and accelerate to the average running speed . There shall be an
unobstructed sight distance along both approaches and both sides at an access ( within the right-of-way)
for distances sufficient to allow the operators of vehicles that are approaching simultaneously to see
each other in time to prevent collisions at the access . All clear sight triangles must be within the public
right of wayright-of-way or a sight distance easement . See also Figure 8-2 .
Distance a2 in Figure 8-2 is equal to distance al plus the width of the lane ( s ) departing from the
intersection on the major road to the right . Distance a2 also should include the width of any median
present on the major road . The appropriate measurement of distance a1 and distance a2 for departure
sight triangles depends on the placement of any marked stop line that may be present and , thus, may
vary with site -specific conditions . In Weld County, the typical distance behind the traveled way to the
stop bar is 14 feet .
b = 1 . 47Vma jor tg Eq . 8 . 6 . 1
b = Access Sight Distance ( see Figure 8- 2 )
U„a;, Design Speed of major road ( MPH )
tg = time gap needed for vehicle entering major road ( sec )
tT = 7 . 5 Car, 9 . 5 Single - Unit Truck, 11 . 5 Combo- Unit Truck
Adjust tgfor crossing more than 2 lanes :
+0 . 5/extra lane for cars
+0 . 7/extra lane for trucks
Also adjust tgfor starting grade of the vehicle if it exceeds 3 %
+0 . 2 sec/ percent grade for cars and trucks ( only for starting uphill )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1111
The value calculated should be rounded up to the nearest 5 feet .
Additional information regarding sight distance for intersections and cases other than the stop control
condition can be found in AASHTO' s A Policy on Geometric Design of Highways and Streets .
Figure 8-2 Departure Sight Triangles at Access (Stop Control )
4 r4b
Weld County Rd Weld County Rd
a2
al
Clear Sight Triangle Clear Sight Triangle
Decision Point 3 up 3 Decision Point
U •L U
Qp Qp
Departure Sight Triangle for Viewing Traffic Departure Sight Triangle for Viewing Traffic
Approaching the Access/Driveway from the Left Approaching the Access/ Driveway from the Right
8 . 6 . 3 Subdivision Roads Sight Distance
Roads should not have visible impediments between 3 feet and 8 feet in height at subdivision
intersections within a triangular area , as shown in Figure 8-3 .
Figure 8-3 Subdivision Road Sight Distance Triangle
EDGE OF DRIVING POINT OF
�
� INTERSECTION
// SURFACE ( FLOWLINE)
40' •
PROHIBITED
AREA
40'
EDGE OF DRIVING
SURFACE ( FLOWLINE)
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 112
8 . 7 AUXILIARY TURN LANES
Auxiliary lanes are useful in maintaining the safety, traffic flow, and operation of a roadway or access .
When auxiliary lanes are required by the County or warranted by information obtained during the
development review process, the applicant is responsible for design , installation , and any purchase of
right-of-way to accommodate the required lane width . Auxiliary lanes are required when unique
location factors ( e . g . , roadway speed and traffic density, access volume , the volume of commercial
trucks, the
influence of nearby accesses, existing auxiliary lanes close to the proposed access, nearby traffic control
devices, available stopping sight distance, and other topographic or roadway design factors) exist that
determine the need for auxiliary lanes .
Auxiliary lanes are required to mitigate specifically identified and documented locations with safety
and/or operational problems . These include :
• Any access where high traffic volume or lack of gaps in traffic make an auxiliary lane necessary
for vehicles to safely and efficiently enter/exit the roadway .
• Any locations where conditions such as horizontal or vertical curves and sight obstructions exist
that cannot be removed and may negatively affect public safety or traffic operations .
Auxiliary lanes typically consist of one or more of the following : transition taper, acceleration or
deceleration length , and storage length ( see Figure 8 -4 ) . The use of these components varies based on
speed limit, through street classification , and site -specific conditions (grades ) .
Figure 8-4 Auxiliary Lanes Layout
AA- REDIRECT TAPERS REDIRECT TAPERS
ACCELERATION LANE DECELERATION LANE
DECELERATION LANE ACCELERATION LANE
TRANSITION TAPERS TRANSITION TAPERS
Auxiliary turn lanes shall be installed on local, collector, and arterial roadways according to the criteria in
Table 8-4, which is consistent with the requirements for Rural Highways in the CDOT State Highway
Access Code . Auxiliary lanes may be also required at the County' s discretion if safety needs or unique
location factors discussed above warrant the addition of an auxiliary lane . Auxiliary lane thresholds
should incorporate a passenger car equivalent factor based on the existing and projected bus, truck, and
combination volumes .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1113
Table 8-4 Auxiliary Lane Requirements
Auxiliary Lane Criteria to be Checked
Minimum Ingress Minimum Ingress Minimum Egress Minimum Egress Left
Classifications Left Turns Required Right Turns Required Right Turns to Turns to Require
for Left- Turn for Right-Turn Require Right- Turn Left-Turn
Deceleration Lane Deceleration Lane Acceleration Lane Acceleration Lane
May be required if it
would benefit the
Arterial 10 vph 25 vph 50 vph
p safety and operation
of the roadway
May be required if it
would benefit the
Collector 10 vph 25 vph 50 vph
safety and operation
of the roadway
Generally not Generally not
Local 10 vph 25 vph
applicable applicable
Deceleration Length
Deceleration Length + Taper Length + Acceleration Length Acceleration Length
Geometric Components + Taper Length +
Storage ( Includes Taper) ( Includes Taper)
Storage Length
Length
The geometric components of a deceleration lane are shown in Figure 8-5 and of an acceleration lane in
Figure 8-6 .
Figure 8-5 Geometric Components of A Deceleration Lane
Deceleration Length
Taper Length SUieagr Length
► Traffic Direction
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1114
Figure 8-6 Geometric Components of an Acceleration Lane
► Traffic Direction
Moor Leriuth wr ,.
Acceleration Length •-
8 . 7 . 1 Auxiliary Lane Length
To determine the required acceleration and deceleration lane and transition taper length , see the design
criteria presented in Table 8-5 and Table 8- 6 . Table 8- 5 is an excerpt taken from Table 4-5 of the State
Highway Access Code, August 31 , 1998 for a Category R- B — Rural Highway . A rural highway is described
as, " highways that have the capacity for moderate to high travel speeds and low traffic volumes
providing for local rural needs . This category may be assigned to low volume minor arterials, secondary
collectors and local highway sections that do not normally provide for significant regional , state or
interstate travel demands . "The Category R- B meets the needs for most Weld County maintained
roadways . The designer should refer to the State Highway Access Code for roadways with characteristics
differing from the R- B description above .
The length of the required transition taper is determined by multiplying the distance offset ( lateral shift )
by the transition taper ratio value associated with the posted speed in Table 8-6 . The beginning and
ending point of all tapers shall be rounded .
• Acceleration Transition tapers : The purpose of an acceleration lane and transition taper is to
provide sufficient length for a vehicle to accelerate to the appropriate speed and merge into the
through traffic lanes without disrupting traffic flow . Table 8-6 provides the required acceleration
lane and transition taper lengths by design speed . Acceleration lane lengths in Table 8- 6 will be
adjusted for a grade of 3 percent or more by the factors shown in Table 8-7 . The total length of
the acceleration lane includes the values of both the lane and transition taper . The length of a
transition taper is calculated by multiplying the width of the lane by a standard ratio shown in
Table 8-6 . The beginning and ending point of all tapers will be rounded .
• Deceleration Lane lengths : Deceleration lengths shown in Table 8-6 represent the estimated
distance to maneuver from the lane into an auxiliary lane and brake to stop . The transition taper
is calculated based on design speed and deceleration lane lengths in Table 8-6 will be adjusted
for a grade of 3 percent or more by the factors shown in Table 8-7 . The storage lane lengths will
be included in the calculation, which are shown in Table 8-8 or based on the results of a Traffic
Study .
• Redirect or straight tapers : Redirect tapers will be used where an exclusive turn lane, median , or
other redirection of vehicles is necessary and where redirection of the flow of traffic is necessary
to accommodate the exclusive turn lane or median . Redirect tapers required for redirecting
through travel lanes will be installed in conformance with Table 8-6 . If the redirect taper would
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1115
result in a horizontal curve design deficiency for the through movement, the horizontal curve
will be corrected . Redirect tapers should be designed as straight tapers with the beginning and
ending points rounded .
• In cases where there is constrained right-of-way, restrictive topography, or limited distance
between intersections, a design waiver may be obtained to construct a shorter auxiliary lane .
Table 8-5 Components of Speed Change Lane Lengths for Rural Highways ( R-B ) from State
Highway Access Code
Access Category Left-Turn Deceleration Lane Right-Turn Deceleration Acceleration Lane
Lane
R- B * decel . Length + storage * decel . Length * accel . length
*Taper length is included within stated accel. Or decel. length
Table 8-6 Acceleration/ Deceleration Lane and Taper Design Criteria and Redirect Taper for
Through Lanes
Acceleration/Deceleration Lane Design Criteria
Posted speed limit ( MPH ) 25 30 35 40 45 50 55 60 65
Deceleration length (ft ) 180 250 310 370 435 500 600 700 800
Acceleration length ( ft ) N/A 190 270 380 550 760 960 1170 1380
Accel/ Decel Transition taper ( ratio ) 7 . 5 : 1 8 : 1 10 : 1 12 : 1 13 . 5 : 1 15 : 1 18 . 5 : 1 25 : 1 25 : 1
Redirect ( Straight) taper for Through Lanes 15 : 1 15 : 1 20 : 1 30 : 1 45 : 1 50 : 1 55 : 1 60 : 1 65 : 1
( ratio )
Table 8-7 Grade Adjustment Factors for Acceleration Lanes
Grade Posted Speed Limit ( mph )
25 to 45 50 55 60 65
3 to 4 . 9% Up Grade 1 . 3 1 . 4 1 . 5 1 . 5 1 . 7
5 to 7% Up Grade 1 . 5 1 . 8 2 . 0 2 . 3 2 . 5
3 to 4 . 9% Down Grade 0 . 7 0 . 65 0 . 65 0 . 6 0 . 6
5 to 7% Down Grade 0 . 6 0 . 55 0 . 55 0 . 5 0 . 5
8 . 7 .2 Storage Lengths
The storage length for an auxiliary lane can be determined by the information summarized in Table 8-8 .
These lengths are based on the average length of a passenger vehicle and the estimated turning vehicles
per hour . Estimated lengths for buses, larger trucks, and recreational vehicles must be determined and
submitted to the County for review, or a " passenger car equivalent" ( PCE ) should be incorporated into
the storage length calculation . Use a PCE of 3 for each bus and all trucks and combinations of 40 feet in
length or longer . Use a passenger car equivalent of 2 for each vehicle or combination at or over 20 feet
in length but less than 40 feet .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE ( 116
Table 8-8 Auxiliary Lane Storage Lengths
Auxiliary Lane Storage Lengths
Turning vehicles per hour < 30 30-59 60- 100 100 200 300
Minimum required storage length (ft ) 25 40 50 100 200 300
Truck traffic generators ( ft ) 100 100 200 200 200 300
The basis for designing the length of required storage is to provide sufficient length for vehicles to queue
within the lane without affecting other movements . Table 8-8 provides the required storage lengths for
stop-controlled intersections . Storage lengths for signal -controlled intersections may be determined
from highway capacity nomographs in the Highway Capacity Manual or may be based on the
recommendations of the submitted Traffic Impact Study for the development . If the Department of
Public Works determines that meeting the required storage length is impractical or will result in an
unsafe condition , the minimum storage length will be based on the mean arrival rate .
8 . 7 . 3 Auxiliary Lane Conflicts
The following standards also apply for auxiliary lane design .
1 . No driveway will be permitted within the transition area of any auxiliary lane .
2 . In the event that a portion of an auxiliary lane extends across one or more adjacent properties,
the County may require the applicant to obtain any necessary right-of-way .
3 . In the event an auxiliary lane is constructed within 100 feet of an arterial -arterial intersection ,
the applicant is responsible for design , acquisition of required right-of-way, relocation of
utilities, and construction of the lane to such intersection .
4 . Where two intersections have exclusive turn lanes that overlap or the ending points of the
exclusive turn lanes have less than 300 feet or one- half their length of separation ( whichever is
shorter) , and a significant structure or topographical feature does not preclude widening, a
continuous exclusive turn lane will be constructed between the intersections to improve
roadway consistency and safety, and to maintain edge of pavement continuity .
5 . If restrictive topography allows only one exclusive turn lane, normally a left-turn deceleration
lane is given first priority . Where a left-turn lane is installed and the travel lanes must be
redirected , an overlay of pavement is required .
8. 8 ACCESS CONSTRUCTION
All roadway access construction that affects existing structures within the County right-of-way— such as
pavement, curbs, gutters, sidewalks, drainage structures, ditches, and auxiliary lanes — is required to
incorporate modifications to existing structures as part of the final access design . An Access Permit is
required prior to any new access construction . The Access Permit allows construction of the access
without the need for obtaining a separate Right-of-Way Use Permit unless the proposed access point is
located within section line County Right-of-Way or if the access is to be paved with asphalt or concrete .
8 .8 . 1 Gravel Requirements
Gravel or recycled asphalt gravel base will be permitted for individual residential access or field access
adjacent to County roads with gravel surfacing . The gravel surface will include a minimum of 6 inches of
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAUL 1117
compacted aggregate base course or equivalent material from the right-of-way line to the edge of the
traveled roadway . Specifications for this material can be found in Section 9 . 6 . 6 .
8 .8 . 2 Pavement Requirements
Access pavement thickness shall match roadway pavement thickness . If required by the weather, a delay
of one season in placement of hot bituminous pavement may be allowed , provided adequate gravel
surfacing is substituted and maintained until asphalt placement .
8 . 8 . 3 Access Drainage
Accesses shall be constructed in a manner that minimizes erosion and does not result in deposition of
silt and debris on the County roadway or in roadside ditches . Accesses that slope down toward the
public road will be constructed to assure that water does not run onto or across the traveled public way .
This may include designing the crown , borrow ditches, pans, or other elements so that they direct water
to the existing drainage facilities along the road . The owner of the property shall pay for materials and
the cost of installation for new access culverts whenever the installation of a culvert is made necessary
by the creation of a new access from private property to a County roadway . The applicant is responsible
for any alterations of the natural flow of water across private properties .
8 . 8 .4 Structures
For efficiency and to avoid maintenance or public safety concerns, the County reserves the right to
maintain the full width of the road right-of-way without structures located thereon . Structures include ,
but are not limited to, fences, trash cans, gates, mailboxes, and irrigation structures regardless of
whether they are physically located on the traveled portion or right- of-way will be removed from the
right of way upon written request by the Department of Public Works . Mailboxes may be located in the
public road right of way only where they do not create a roaddside hazard , obstruct or hinder vehicular
or pedestrian traffic, or interfere with road maintenance activities such as snowplowing and mowing .
Mailboxes will be located at least 8 feet away from the edge of the traveled way .
Wear, damage , or breakage to mailboxes, fencing, decorative items, signage , or any other
appurtenances throughout the property roadside frontage due to thrown snow and inclusions from
snow removal activities on a County- maintained road will not be the responsibility of the County .
8 . 9 AVERAGE DAILY TRAFFIC COUNT
Volume counts are expressed as average daily traffic ( ADT) counts or annual average daily traffic ( AADT)
counts . ADT is the unadjusted , average number of vehicles passing in both directions at a specified
location of a roadway . AADT is the term used to show the average traffic volume in both directions on a
section of road , adjusted for seasonal variation . Traffic count information for pavement designs must be
obtained from the Weld County Public Works Department . If the count information is not available for
the area needed , then a traffic count must be completed by the designer and approved by Weld County .
The count must be a 72 - hour continuous count and completed on Tuesday, Wednesday, and Thursday
of a normal week ( no holidays or special events taking place ) . The traffic count cannot be a raw volume
count; it must include a Vehicle Classification . If known changes to the traffic volumes exist since the
latest count, such as new development or changes to existing development that could modify the
counts, then a new traffic count may be warranted .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 118
Table 8-9 Traffic Count Seasonal Adjustment Factors
SEASONAL ADJUSTMENT FACTORS
Timeframe Adjustment Factor
Jan . 1—Feb . 28/29 1 . 08
Mar . 1—Apr . 4 1 . 00
Apr. 5—May 16 0 . 98
May 17—Jun . 20 0 . 96
Jun . 21—Aug . 22 0 . 94
Aug. 23—Sep . 26 0 . 94
Sep . 27—Nov . 1 0 . 97
N ov . 2—Nov . 29 1 . 04
N ov . 30—Dec . 31 1 .08
8 .9 . 1 Vehicle Classification
Vehicle classification categorizes vehicles into three types, as described below .
• Lightweight vehicles : All motorcycles, cars, pickups, vans, and single/dual wheels
o Class 1 through Class 3
• Single units : Buses and other units up to three axles
o Class 4 through Class 7
• Combo units : Vehicles of four axles and more
o Class 8 through Class 13
Error ! Reference source not found .Figure- 8-7 shows the most common types of vehicles found on the
nation' s highways . Designers can use this information to determine which vehicle classification category
should be used for the vehicles identified in the traffic count .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1119
Figure 8-7 FHWA Vehicle Classification ( CDOT M-E Pavement Design Manual, Figure 3 . 6)
jams Schema Deecrinon
' 4 a r iotercyc es plies
1 two wheel axles
Z rill ail cam plies
1 _ _ or o`*c axie niler5§> a 4.--.--4"6.-- all pbk ups and %ears
Ireli) 1; sslrgie•idual f r,eeis
in r.. -:aim-- a�e /three axle__site Ilici.:77%-iip
' 00• 0 Ird trailers cef. R .., _I .1 -1-r
I) ! 1 149 buses
41=1'
•! icieCLa ,;���
014
t 4 _ 411 - �.. �'`'� two ax►e
'-i +---a 5 Engle S fit
0 14 singli'o vahee:s
It E w : - • r"a I i al il s •
cp -s O T1 9; tnr_e accle
6 Pr sii — — � � � e' • J
sncle unit
i:4
fox axle
7 sligle unit
eillb 1.1—Traillgailleri-
ill
r s rots or less axles,
8 '. , •
.:- sing eVallecs
• r"_
ei -1
9 ;Ers._ Hi
five 3X e5
iii ail _
sing ke trailers
10 im_nr ,40 6i or no re :r
__ singe trailers
I. _ _r _
• ---t five arie; :�'tc
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_ ra- rnulti-tra. ets
0 .4 W W
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1 3 17 1 '+ seven or more ares
NI 00 400 mum-balers
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I 14
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15
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--- - - - -- - - - - - -- - _ ..--
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1120
CHAPTER 9 SOIL INVESTIGATION AND PAVEMENT DESIGN
9 . 1 INTRODUCTION AND PURPOSE
The design of a pavement structure involves the consideration of many factors and conditions — the
most important being traffic volumes, vehicle classifications, design materials, existing materials, local
climate, and drainage conditions . The purpose of this chapter is to give general guidance and to
supplement the existing design information contained within the latest editions of the 1993 AASHTO
Guide for Design of Pavement Structures and the CDOT M-E Pavement Design Manual, as well as
AASHTO or ASTM Material Manuals . AASHTO 1993 should be used only for onsite roadway pavement
designs and M - E should be used for any offsite pavement designs maintained by Weld County . These
criteria provide the basic design procedures and reporting guidelines for flexible and rigid pavements .
The final design should be based on a thorough investigation of specific project conditions, projected
traffic, life - cycle economics, and on the performance of comparable projects with similar structural
sections under similar conditions . An adequate pavement design will reduce long-term maintenance
costs and provide a long- lasting driving surface .
9 . 2 FIELD INVESTIGATION AND SOIL SAMPLES
Designers should visit each site to gather information that may help determine the appropriate design .
Whether this is a new design or rehabilitation of an existing pavement, information such as current
distress, drainage conditions, roughness, traffic control options, and surrounding land usage should be
collected and will be used later during the actual design .
9 . 2 . 1 Testing Frequency
Soil samples within the project limits will be obtained for each soil type as defined in the Soil Survey of
Weld County, Colorado ( http ://websoilsurvey . nres . usda .gov/app/) or at a spacing of not more than 500
linear feet . These boring locations will include , but not be limited to, travel lanes, shoulders, auxiliary
lanes, and roadside ditches .
9 . 2 . 2 Sampling Procedures
Borings can be performed by either an auger or core drill . The depth of each hole generally should be at
least 5 feet to 10 feet, depending on the anticipated depths of cuts or fills of a new roadway . Borings for
rehabilitation of existing surfaces generally can be on the lower side of the range unless major
reconstructions are necessary at certain locations . All borings will be field logged and visually classified .
9 . 3 SUBGRADE TESTING
9 . 3 . 1 Classification
Each boring location will be tested to determine liquid limit, plastic limit, plasticity index, and the
percentage passing the U . S . Standard No . 200 sieve . Test results will be used to calculate the AASHTO
Classification and Group Index using AASHTO M 145 .
These data will be determined using the following methods :
• Liquid limit : AASHTO T 89 or ASTM D 4318
• Plastic limit : AASHTO T 90 or ASTM D 4318
• Percent passing No . 200 sieve : AASHTO T 11 or ASTM C 117
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1122
• Gradation : AASHTO T 27 or ASTM D 422
9 . 3 .2 Swell Test
Swell potential evaluation will be required when a soil is classified as an A-6 to A-7 type .
• Swell test : AASHTO T 216 or ASTM D2435
9 . 3 . 3 pH and Sulfate
pH and Sulfate testing will be performed at each boring location . It is important not only to identify the
presence of sulfates but also the depth of occurrence . The designer or project manager should know
what depths are crucial to the success of the design .
• Sulfate ion content : CP- L2103
• pH of soils : AASHTO T 289
9 . 3 .4 Moisture Density
Standard test methods for moisture density are described in AASHTO T 99 and AASHTO T 180 .
9 . 3 . 5 Hveem Stabilometer
Representative samples will be tested to determine the subgrade support value using Hveem
Stabilometer ( R-value ) testing . These values will be used in the design of the pavement section . R-value
will be performed on each soil group ( AASHTO classification ) but will never be less than a minimum of
two per soils report . These tests will be conducted in accordance with the following procedures . We
suggest performing the hydrometer testing for all applicable soil of interest since the percent silt and
clay content in soil are identified as important independent variables .
• R-Value : CP ( Colorado Procedure ) 3101 ( AASHTO T190 & ASTM D 2844-07 ) where the reference
documents used to develop CP 3101
Table 9-1 Test Requirement and Frequency
Test Testing Frequency Notes/Exception
Liquid limit Each Boring Location
Plastic limit Each Boring Location
Gradation Each Boring Location
AASHTO Classification Each Boring Location
pH Each Boring Location
Sulfate Each Boring Location
Swell Each Clay Soil Type A-6 through A-7 -6 soil types
Moisture — Density Per Report Bulk sample of material governing pavement design
CBR or ft-value See Section 9 . 3 . 5
9 .4 PAVEMENT DESIGN CRITERIA FOR ONSITE ROADWAYS
Weld County' s pavement design method for onsite roadways is based on the 1993 AASHTO Guide for
Design of Pavement Structures equations and CDOT guidelines . This section provides the criteria used
for the design of these pavements . These criteria will ensure adequate strength and durability to carry
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1123
the predicted traffic loads for the design life of each project . Alternative designs will be considered as
advances are made in pavement design methods and paving materials . Any deviation from the criteria
presented in this document must be technically justified and approved by the Public Works Department .
Weld County does not allow the use of full -depth asphalt paving and does not accept maintenance of
any full -depth paved roads .
9 .4. 1 Design Equivalent Single Axle Loads (ESAL)
There are certain input requirements needed to obtain an 18, 000- pound ( 18 KIPS ) Equivalent Single Axle
Load calculation or design ESAL .
• Annual average daily traffic count ( see chapter 8 )
• Vehicle classification ( see chapter 8 )
• Traffic equivalence load factors
• Traffic growth rate
• Design period
• Lane factor
9 .4 .2 Traffic Equivalence Load Factors
The equivalence load factor is a numerical factor that expresses the relationship between axle loads of
the three types of vehicles . Table 9 - 2Table 9 3 presents equivalence loads factors from CDOT' s M-E
Pavement Design Manual.
Table 9-23 Equivalence Load Factors (CDOT M-E Pavement Design Manual, Table H . 2 )
3- Bin Vehicle Classification Flexible Pavement Rigid Pavement
Lightweight vehicles 0 . 003 0 . 003
Single units 0 . 249 0 . 285
Combo units 1 . 087 1 . 692
9 .4 . 3 Traffic Growth Rate
The number of vehicles using a road tends to increase with time . Weld County uses a 20-year growth
rate to estimate the future traffic on roadways . The growth rate is applied to all of the vehicle
classifications . A growth rate assumes that the AADT percent growth rate for any given year is applied to
the volume during the preceding year . Contact the Public Works Department for assistance in
determining an appropriate growth rate .
9 .4 .4 Lane Factor
The number of vehicles or ADT on the roadway will be split according to the number of lanes in the
proposed roadway . Table 9- 3Table 9 4 lists the acceptable values .
Table 9-34 Lane Factors ( Modified from CDOT M-E Pavement Design Manual, Table 3 . 3 )
Lanes per Direction Design Lane Factor
One lane 0 . 60
Two lanes 0 .45
Three lanes 0 . 309
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 124
Four lanes 0 . 25
9 . 5 FLEXIBLE PAVEMENT DESIGN
9 . 5 . 1 Serviceability and Reliability
The initial serviceability for asphalt at construction normally will fall in the range of 4 . 2 to 4 . 6 and
generally will be assumed to be 4 . 5 . The terminal serviceability is based on the current ADT. These
factors can be found in Table 9 -4Table 9 5.
Table 9-45 Serviceability
Serviceability Loss ADT
2 . 0 >750
2 . 5 < 750
The reliability factor, shown in Table 9- 5Table 9 6, is based on the functional classification of the
roadway . Weld County' s functional classification map can be found on the transportation planning
section of the Public Works Department web page .
Table 9-56 Reliability Factor
Functional Classification Urban/Rural
Arterial 90
Collector 85
Local 80
9 . 5 .2 Standard Deviation
Weld County uses an overall standard deviation of 0 . 44 for all pavement designs .
9 . 5 .3 Drainage Factor
The drainage factor shown in Table 9-6Table 9 7 may be incorporated into the pavement design to
account for the drainage characteristics of the site .
Table 9-67 Drainage Factor
Percent of Time Pavement Structure is Exposed to Moisture
Quality of Water Removed Levels Approaching Saturation
Drainage Within :
Less than 1% 1% to 5% 5% to 25% >25%
Excellent 2 hours 1 .40- 1 . 35 1 . 35- 1 . 30 1 . 30- 1 . 20 1 . 20
Good 1 day 1 . 35- 1 . 25 1 . 25- 1 . 15 1 . 15- 1 . 00 1 . 00
Fair 1 week 1 . 25- 1 . 15 1 . 15- 1 . 05 1 . 00-0 . 80 0 . 80
Poor 1 month 1 . 15 - 1 . 05 1 . 00-0 . 80 0 . 80-0 . 60 0 . 60
Very poor Will not drain 1 . 05 -0 . 95 0 . 95 -0 . 75 0 . 75 -0 . 40 0 . 40
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1125
9 . 5 .4 Strength Coefficients
The strength coefficients are used in the structural number equation to determine the thickness of the
various layers of the pavement structure . Table 9-7Table 9 8 lists the strength coefficients for various
potential components of the pavement section .
Table 9-78 Strength Coefficient
Strength Coefficients
Component Test Criteria
( per inch of material )
Conventional Materials
HMA 0 . 44 See Section 9 . 6 . 3
* Existing bituminous pavement 0 . 20-0 . 40 N/A
Aggregate base course 0 . 14 R-value ≥83
Aggregate base course 0 . 12 77≤ R -value <83
Aggregate base course 0 . 11 69≤ R-value < 77
Existing aggregate base course 0 . 09 N/A
Treated Materials
Fly ash 0 . 10 7-day, 150 psi
Lime treated subgrade 0 . 14 7-day, 160 psi
Cement treated base 0 . 22 7-day, 100-200 psi
Cement treated base 0 . 23 7-day, 200-300 psi
*Falling Weight Deflectometer or CDOT structural layer coefficients of existing pavements forms will be used to
determine the structural coefficient for existing bituminous pavements.
9 . 5 . 5 Pavement Thickness
Full -depth pavement sections will not be allowed within the County- maintained right-of-way . A
composite section of hot mix asphalt ( HMA ) and free draining sub- base material will be used . Total HMA
thickness will not be placed in lifts less than three times the nominal maximum aggregate size of the mix
being used .
9 . 5 .6 Pavement Design
All pavement design will be prepared in accordance with AASHTO and CDOT pavement design
procedures . A computer-generated printout of the design and/or other design calculations must be
included with the design submittal .
In lieu of design , 12 inches of HMA over 12 inches of aggregate base course ( ABC ) will be the minimum .
9 . 6 MATERIAL SPECIFICATION
9 . 6 . 1 General
All sources of mined or manufactured materials used within the County- maintained right-of-way must
be approved annually by the Public Works Department .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P AG h 1126
9 . 6 . 2 Procedure for Material Source Approval
On or before April 1 of each year, or a minimum of 14 calendar days before beginning construction ,
materials suppliers will supply written documentation and material test results from a materials testing
laboratory . These will indicate the following :
• That the material ( s ) being tested meet ( s ) the minimum specifications
• The test procedure employed
• The material test results
A signed statement will be provided by the material suppler certifying that the materials tested are
representative of the materials to be provided during the coming 365 -day period .
9 . 6 . 3 Hot Mix Asphalt
HMA will meet the requirements of and be placed according to Table 9 -STable 9 9 below and the latest
edition of CDOT' s Standard Specifications for Road and Bridge Construction . The 100 gyration mixes
should be used on arterial and collector roads . 75 gyration mixes to be used on minor and major
residentials roadways . HMA leveling courses, mid mats, and residential wear courses to be 64-22 mixes
with a maximum of 20% RAP used in aggregate gradation . HMA topping or wear course should be an SX
64-28 mix with 100 virgin aggregate a maximum of 20% RAP, on arterial and collector roads .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1127
Table 9-89 Master Range Table for Hot Mix Asphalt from Table 703-4 in CDOT's Standard
Specifications for Road and Bridge Construction
Percent by Weight Passing Square Mesh Sieves
Sieve Sin' trading Grading Grading Grading Grading
SF ST sX S SG
ti 1111T1
// I 01 )
11/2" )
25 .0 mm
l 1 )(_1 90 [ o + a
19.0 ruin
1 ( R ) 90 100
(34 )
,
12.5 nun 1 + )o k ; o 111( 1
vin
9.5 mai 1 Qt )i I ) )s )
(1( 1
(3/(
4. 75 mm 90 100
(#4 )
1 . 3{) mm r
28 — , 28 — 58 4t ) 1Q 45
08)
1 . 18mm
(# 16 ) 30 — 54
600 p_tn1 1:
(#30)
300 pm
(#50)
150µm
(# 100)
75
a
pin 2 _ 12 H H , - 8 1 - 7
( #200 )
* These additional Form 43 Specification Screens will initially be established
using values from the As Used Gradation shown on the Design Mix .
9.6.4 Portland Cement Concrete Pavement
Portland Cement Concrete Pavement ( PCCP ) materials will meet the requirements of and be placed
according to Table 9-9Table 9 10 below and the latest editions of CDOT' s Standard Specifications for
Road and Bridge Construction and CDOT' s M& S Standard Plans .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1128
I Table 9-910 Concrete Aggregate Gradation Table from Table 703-1 in CDOT' s Standard
Specifications for Road and Bridge Construction
Coarse Aggregates (from AASI ITO \ I4 3 ) Fine
No. 3 No. 357 No. 4 No. 467 No. 57 No. 6 No. 67 No. 7 No. 8 Aggregate
SO mm 50 mm - 5 HMI 37. 5 mm 25.0 nom 19.0 mm 19.0 mm 12.5 mm 9.5 mm 4.75 mm
fin e Slit to to to to to to to to to to
25.04.75 mm 19.0 mm 4.75 mm ' 5
� 9.5 mm 4.75 mm 4.75 mm 2.36 tun 150 pm
(2" to ( 1 %." to ( 1 :'� to „ (A� to ( ,44 to ( 1 to ( 3/s to (#4 to
(2"
1,� to No 41 ;!a") #4) ( I, �o /8”) #41 #.4) #8 ) # 1001
63 mm
(2W") lO 100
50 mm ( 2" ) 90- 100 95- 100 loo I tit )
. mm 35-70 00 11It 1 95 100 100
( 1W ;
25 .0 mm ( 1 i5 _ ,i l 1 ( 1 _ ,_, *) - 1011 100 1 ()()
( 1 "" 119.0 mm
wit) 0 15 35 70 90. 100 90- 100 100
12.5mm _ , _
( ! c, iiI _ , i1 _ , rail 20—n `) U- 1llU Iii( i
9. 5mrn
0 S. 10 30 0 1 20-55 40 7i ► ,N _H loo 100
(3/8" )
4.75 mm _
0-5 ( I " 0 H 0 -, 0- I () 0- 15 to 10 k .15 HI )
(#4 )
2.36 mm
(#8) 0-5 0--5 0 5 ( ) 1 ( l 80`- 100
1 . 18 inn]
( l 6 ) 0-5 50-85
600 pm 25-60
(#30)
300 11111
Ill ; l: )
(#50)
150 purl
II )
HIM )
9 . 6 . 5 Aggregate Base Course
ABC used in the pavement sections shall be crushed angular manufactured aggregate Class 6, unless
otherwise approved . Class 6 Aggregate Base Course will meet the requirements in Table 9 - 10Table 9 11,
which shows the gradation requirements, PI requirements, and LA Abrasion requirements . The
minimum R-value shall be 69 . Angularity of aggregate shall have a minimum fractured faces of one or
more as per ASTM D 5821 of 45 % or more . Recycled Concrete Product ( RCP ) aggregate base course shall
not be used as shouldering material or as an exposed layer. RCP will be covered by a subsequent layer .
The liquid limit shall be as shown in Table 9 - 10Table 9 11 and the plasticity index shall not exceed six
when the aggregate is tested in accordance with AASHTO T 89 and T 90 respectively .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1129
Table 9-1044 Aggregate Base Course Requirements
Mass Percent Passing Square Mesh Sieves
Sieve Designation
LL not greater than 35 LL not greater than 30
Standard Mesh ABC
( mm ) Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 RAP
( �in )
150 6" 100
100 4" 100
75 3" 95 - 100
63 2 . 5" 100
50 2" 95- 100 100 100
37 . 5 1 . 5" 90- 100 100
25 . 4 1" 95 - 100 100 85 - 100
19 3/4" 50-90 100 75 - 100
12 . 5 1/2" 55 -90
9 . 5 3/8" 45 -80
4 . 76 No . 4 30-65 30-50 30-70 30-65 25 -55
2 . 38 No . 8 25 -55 20-85
1 . 18 No . 16 5 -55
0 . 42 No . 40
0 . 07 No . 200 3 - 15 3 - 15 20 max 3 - 12 3 - 15 3 - 12 5 - 15 0-5
Plasticity index 0 0 0 <6 <6 <6 <6 <6
LA wear test (T96 ) 50 max 50 max
9 . 6 .6 Aggregate Surface Course (Gravel)
Aggregate used as surface course will meet the following requirements, unless otherwise approved .
Furnish hard , durable particles or fragments of crushed stone, crushed slag, or crushed gravel
conforming to the following :
1 . Los Angeles abrasion , AASHTO T96 40%
2 . Mechanically Fractured faces, one or more , ASTM D 5821, crushed material,
1. not screened , to attain fractured face - - - - --45% min .
2.3 . Free from organic matter and lumps or balls of clay
3 .4 . Liquid Limit, AASHTO T89 3530 max .
4:5 . Dust ratio : %passing # 200
% assin #40 2/3 max .
p 9
5. 6 . Gradation and plasticity index: AASHTO T90 As shown in Table 9- 11Tabie 9 12
Do not use material that breaks up when alternately frozen and thawed or wetted and dried .
Obtain the aggregate gradation by crushing, screening, and blending processes as necessary. Fine
aggregate, material passing the No 4 sieve , will consist of natural or crushed sand and fine mineral
particles .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 130
Do not furnish material that contains asbestos fibers . Recycled concrete cannot be used as surfacing
gravel .
Table 9-1112 Aggregate Surface Course Requirements
Sieve Designation Mass Percent Passing Square Mesh Sieves
Standard ( mm ) Mesh ( in ) Aggregate Surfacing
150 . 00 6
100 . 00 4
75 . 00 3
63 . 00 2 . 5
50 . 00 2
37 . 50 1 . 5 100
25 .40 1 90- 100
19 . 00 3/4"
12 . 50 1/2" 55 -80
4 . 76 No . 4 45 -65
2 . 38 No . 8 33 -53
0 .42 No . 40 15 -35
0 . 07 No . 200 4- 15
I Plasticity index 4 126 -_16
LA wear test (T96 ) 40 max
9 . 7 SOILS / PAVEMENT DESIGN REPORT
The soils/pavement design report will include the following information :
1 . Vicinity map of investigated area
2 . Transparent overlay of proposed project " plan view" on vicinity and boring location drawings .
3 . Scaled drawing showing the location of borings
4 . Scaled drawing showing the estimated extent of subgrade soil types, thickness of base material ,
thickness of and HMA
5 . A spreadsheet showing all the factors used to calculate the design ESALs
6 . Summary sheet listing all sample designations, liquid limit, plasticity index, percent passing the
No . 200 sieve, AASHTO classifications, group index, soil description , R-value, moisture content,
percent soluble sulfate , and pH
7 . A discussion regarding potential subgrade soil problems, including, but not limited to, soils with
swelling potential, frost- susceptible soils, groundwater, drainage considerations ( surface and
subsurface ) , cold weather construction ( if appropriate ) , soluble sulfates and pH in the subgrade ,
and other factors or properties that could affect the design or performance of the pavement
system
8 . Recommendations to alleviate or mitigate the impact of potential subgrade soil problems
9 . Pavement design alternatives for roadway
10 . Pavement mix types to be used for the project
11 . Any deviations from the County criteria and discussion/justification of the deviation , a formal
request will be submitted for approval of the design alternative
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1131
CHAPTER 10 CONSTRUCTION CRITERIA
10 . 1 GENERAL
For the public safety, health , and well - being, it is crucial to ensure that proper construction practices
and industry standards are followed . The construction criteria defined within this chapter will be used
for any work within the County right-of-way and any infrastructure proposed for County maintenance .
In this chapter, the "contractor" is the individual , company, landowner, developer, or other entity legally
responsible for the construction work . Unless otherwise indicated , the term "engineer" refers to the
current County Engineer or his/her authorized representative, the term "department" refers to the
Weld County Public Works Department, and the term " inspector" refers to the current Weld County
lead construction inspector or his/her authorized representative .
10 . 1 . 1 Policy on the Use of Referenced Publications
The information provided herein summarizes and/or supplements minimum standards that have been
prepared in great detail by CDOT. The most recent publications of the Weld County Department of Public
Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge
Construction with the Weld County Special Protect Revisio-ns and M&S Standard Plans are recognized by
Weld County as being the primary documents used by transportation contractors and construction
crews . However, CDOT policies represent statewide standards, which do not always satisfy local
conditions . When standards differ, the most recent version of the Weld County Department of Public
Works Conformed Standard Special Revisions to CDOT Standard Specifications for Road and Bridge
Construction will govern followed by the instructions and
guidance in this chapter will govern .
All construction traffic control devices and their use must be in accordance with the latest version of the
MUTCD .
10 . 1 . 2 Control of Work and Inspection
The Department is responsible for oversight and inspection of construction that takes place within the
County right-of-way and for infrastructure proposed for County maintenance . In addition to the primary
goal of promoting public safety, the goal of County oversight — which takes the form of establishing
standards and conducting inspections — is to help ensure quality construction and thereby minimize the
long-term maintenance costs associated with County- maintained infrastructure . The County has the
authority to impose standards on construction work and determine whether it has been constructed in
accordance with approved plans .
The contractor is responsible for staying informed about and complying with all federal , state, and local
laws, ordinances, and regulations that may affect the work or impact those employed to do the work .
The contractor will indemnify the County against any claim or liability arising from the County' s actions .
Failure to meet these conditions can result in suspension of the work by the Department .
The ciDepartment will have the authority to suspend work if the contractor has failed to maintain safe
conditions for the public . Such notification will be presented to the contractor in written form , at which
time work will cease immediately — except for any activities necessary to position traffic control devices
and put other safety measures in place to leave the project site in a safe condition during the shutdown ,
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1133
as directed by the engineer. The engineer will be the final authority in matters related to the proper
interpretation of approved plans and will make final determinations when discrepancies in the plans or
disputes between the inspector and the contractor occur .
The inspector will have the authority to inspect all work and materials being used . The role of the
inspector is to use acceptable engineering techniques and professional judgment to determine if the
construction is being accomplished according to the methods described in the standards . The contractor
will cooperate fully with inspection efforts, allow access to all parts of the work, and furnish any
information required for complete and detailed inspections . Inspection by the department will not
relieve the contractor or its designated representatives of the responsibility to control the work and
ensure compliance with the approved plans and specifications for the project .
10 . 1 . 3 Project Acceptance and Warranty
All work that does not conform to the standards grand the approved plans — whether resulting from
poor workmanship, use of defective materials, or lack of care — will be considered unacceptable work .
Unacceptable work will be subject to removal and restoration prior to final acceptance of the project by
the County . Disputes related to the acceptability of work will be subject to a final determination by the
engineer .
Upon written notice from the contractor of the completion of all work, the inspector will make a final
inspection . If all project work is determined to be in compliance with the standards, the approved plans,
the performance guarantee , the subdivision improvement agreement, and the contract agreement or
other applicable agreements, the County will initiate the procedure for final acceptance and perform an
inspection for final acceptance . If the inspection discloses any work as being unacceptable , the Public
Works Department will notify the contractor in writing . After corrections have been made, another final
inspection will be scheduled .
The contractor will be responsible for maintenance and traffic control until final acceptance of the
project has been granted by the Public Works Department . Final acceptance does not relieve the
developer and/or contractor of a minimum two -year warranty on all workmanship and materials
incorporated into the project, unless specified otherwise by the County . The warranty period will
commence on the same date that written final acceptance is granted . Prior to the end of the warranty
period , the inspector will arrange for the project to be inspected and will notify the contractor of any
work items to be completed .
10 . 2 CONTRACTOR RESPONSIBILITIES
10 . 2 . 1 Qualifications, Insurance Requirements, and Licensing
Any contractor performing work within the right-of-way will have the qualifications to complete the
work in an acceptable and timely manner and will receive the necessary permit ( s ) from the Public Works
Department before beginning work . Contractors will be fully licensed , insured , and possess a valid IRS
Taxpayer Identification Number. The iHiepartment reserves the right to suspend or deny work being
performed by any contractor or business that has been determined by the engineer to be unqualified to
perform construction within the right of wayright-of-way .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 134
The contractor will indemnify the County from lawsuits and claims of any type that may occur as a result
of its actions while performing work within the right-of-way. Until final acceptance of the project, the
contractor will procure and maintain insurance coverage in the minimum amounts specified in the most
recent version of the Weld County Department of Public Works Conformed Standard Special Revisions to
CDOT Standard Specifications for Road and Bridge ConstructionWeld County Special Project Revisions to
the CDOT Specifications from an insurance company authorized to do business in the State of Colorado .
The types and coverage limits of insurance will be at least the minimum amounts specified in CDOT
Specifications .
10 .2 .2 Pre - Construction Meetings
Contractors mayshall be required to schedule and attend a pre -construction meeting prior to starting
work on complicated projects . The engineer can waive this requirement if the project is small or
straightforward and it is determined that a meeting is not necessary . Attendees at the meeting typically
are the contractor' s key personnel , subcontractors, material suppliers, utility companies, material
testing firms, the County inspector, and the County engineer. The meeting typically is held at least one
week prior to start of construction .
The pre -construction meeting agenda likely will include the following :
• Exchange of contact information ( phone numbers, fax numbers, etc . )
• Applicable safety requirements, contact information , and emergency procedures
• Construction traffic control requirements and methods
• Construction schedule with key dates and benchmarks
• Required contract paperwork ( insurance , bonds, escrow, permits, etc . )
• Material submittals and testing requirements
• Special conditions and access requirements
10 . 2 . 3 Permits
Permitting requirements are discussed in Chapter 11 of this document . In addition to approved
construction plans, Weld County often will require obtaining and adhering to all requirements of a
Transport Permit, Right-of-Way ` ` ;__ Permit, Access Permit, Grading Permit, and Floodplain Development
Permit .
The contractor will be fully informed and knowledgeable of all required state and federal permits . Weld
County is not responsible for ensuring the contractor has satisfied permit requirements from other
agencies . However, copies of fully executed permits will be furnished to the engineer or inspector upon
request .
10 .2 .4 Public and Worker Safety
All work will be conducted in a manner that minimizes obstructions to traffic and pedestrians . The safety
of the traveling public and adjacent landowners is the most important issue on every construction
project . Contractors must inspect and maintain the project to ensure safety, as they bear the sole
responsibility for any accidents or injuries related to the construction . The dDepartment has the
authority to suspend work if the contractor has failed to maintain safe conditions .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1135
The contractor will observe all rules and regulations of federal , state, and local health officials and
departments . No workers are allowed to be required to work in unsafe surroundings or under conditions
that are unsanitary, hazardous, or dangerous . Contractors will be fully informed and knowledgeable of
all current construction safety practices and protective equipment to be used for specific work
conditions .
The contractor is responsible for complying with all safety regulations governed by the Occupational
Safety and Health Administration ( OSHA ) . The inspector is not responsible for enforcing these
regulations, but will monitor construction activities for obvious or suspected noncompliance with OSHA
regulations and will report any such issues to the contractor and the engineer . If imminent danger
potentially resulting in serious injury or death is identified in the construction area , and the contractor
has failed to act immediately to correct the dangerous condition , the engineer can issue a written work
suspension order.
10 .2 . 5 Utility Coordination
When excavating or grading in the area of underground utilities, the contractor will comply with Article
1 . 5 of Title 9, Colorado Revised Statutes, " Excavation Requirements . " as modified by SB- 18 - 167 . The
contractor will notify all affected utilities at least two business days prior to commencing work and will
contact the Utility Notification Center of Colorado ( UNCC ) at 8- 1 - 1 to have locations of UNCC- registered
utilities marked onsite . All other underground facilities will be located by contacting the respective
utility owner . Affected utility company representatives should be invited to the pre -construction
meeting . Where the contractor' s operations are adjacent to a utility owner' s facilities, work will not
commence until arrangements ( acceptable to both parties ) for the protection of the utilities have been
made .
The approved plans will indicate clearlyclearly indicate those utility items that are to be relocated or
adjusted by the utility owner and those utility items that are to be constructed by the contractor . The
contractor will meet with the utility owners as often as necessary to coordinate and schedule
relocations or adjustments . Weld County is not responsible for the actions of utility owners, and the
contractor will not seek damages or claims against the County for coordination , inconvenience, delay, or
damages sustained due to interference from the utility owners .
10 . 2 . 6 Dust Control
The contractor is responsible for dust control related to its construction project . The contractor also is
responsible for compliance with the Colorado Air Quality Control Act . The majority of construction sites
can achieve adequate dust control by providing a water- spray truck to keep moisture in the exposed
soil . Water trucks may be required on any construction sites that disturb an area of land greater than 1
acre , or for projects that are using gravel roads as the main access to the construction site . The goal of
dust control is to prevent airborne particulates ( dust ) from leaving the construction site or access roads .
Damages or health issues caused by dust leaving the construction site are the sole responsibility of the
contractor . The contractor will be responsible for cleaning up and removing any dirt or dust that has left
the construction site .
Closure of a roadway often requires the contractor to set up a designated detour route for traffic . If the
detour route uses an existing gravel road , dust mitigation and road deterioration can quickly become a
problem . Such detours often will require the contractor to apply a durable dust treatment, such as
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA r A G E 1136
magnesium chloride . The department will determine the quantity, frequency, and locations of such dust
treatments . The contractor will need to use a county approved vendor which has a Right-of-way Use
permit with the county for the application .
The inspector will monitor the construction site and let the contractor know if dust control measures are
inadequate . Reasonable complaints received by the County or contractor from adjacent landowners, or
the traveling public will be addressed by the contractor in 24 hours or less . Failure to respond to
reasonable requests ( as determined by the County) to provide dust control or failure to provide a water
truck on the construction site can result in a written suspension of work order from the engineer.
10 . 2 . 7 Traffic Control
During construction , the contractor will be responsible for supplying and maintaining traffic control
devices according to the requirements of the MUTCD . Any work within the right of way requires
approval of the Method of Handling Traffic ( MHT) by the department prior to work commencing . In
addition , any road closure within the right of way that will last for three days or more requires
approval by the BOCC prior to work commencing . The contractor should allow at least two weeks prior
to the planned road closure to obtain required approvals from the County .
The contractor' s MHT will be prepared by a person knowledgeable and qualified in the area of traffic
control, who is a certified Traffic Control Supervisor (TCS ) . The MHT will be easily readable, prepared in a
professional manner, and include the following elements :
• A project site location map
• A diagram showing the location of all traffic control devices
• A tabulation of the sizes, types, and quantities of all traffic control devices
• Location of all existing roads and accesses within the traffic control zone
• Certifications of all TCSs and flaggers working on the jobsite
Traffic control devices will be inspected by the contractor' s TCS for proper placement on at least a daily
basis and will be inspected during the nighttime at least once per week . The reflective surfaces of all
signs will be checked and cleaned on a regular basis, no less frequently than every two weeks . For safety
reasons, the contractor will not store materials or equipment near open travel lanes . Portions of the
roadway that are open to traffic will be maintained , kept clean , and kept free of snow and ice by the
contractor.
The inspector will monitor the traffic control set- up to ensure the MHT is being followed and to look for
any problems that need to be corrected . If the inspector deems that changes to the traffic control are
necessary, this will be communicated to the contractor and/or TCS .
10 .2 . 8 Removal of Unacceptable or Unauthorized Work
Unacceptable work resulting from any cause found to exist prior to final acceptance of the project will
be removed and replaced in an acceptable manner at the contractor' s expense . The construction of
transportation facilities requires a high degree of precision and quality from the contractor. These
facilities will eventually be used by the traveling public, who assume that safe and predictable driving
and drainage conditions exist . Failure to remove and/or replace unacceptable or unauthorized work
within the right of-, way can expose the contractor to liability .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1137
The inspector is authorized to ensure the contractor is following approved plans and specifications, to
identify work that is unacceptable or unauthorized , and to communicate such findings to the contractor .
The contractor will correct the identified work in a timely manner . If the contractor and the inspector
disagree about whether work is unacceptable or unauthorized , the final determination will be made by
the engineer .
10 . 2 .9 Record Drawings and Record Keeping
Preparation and organization of project records and record ( as - built ) drawings is an important step for
ensuring proper future maintenance of transportation facilities . This is especially true when the project
includes construction of underground facilities .
Changes in the scope of work, geometric design , structural plans, typical sections, standard plans,
specifications, and corrections of design errors must be incorporated into the as- built plans . These as-
built plans shall be sealed by the engineer responsible for changes .
Information shown on the as-constructed plans should include , but is not limited to the following :
Structures :
• Show tip elevation of piling for each pier, wall , or abutment .
• Show structure changes for both minor and major structures .
• Show type , manufacturer, manufacturer' s project number, and shop drawing number of bridge
expansion and bearing devices installed .
• Show elevation and placement of brass cap benchmarks, when used . The elevation should be
project specific and marked on the plans . All temporary benchmarks on the plans will be lined
out .
• Vertical and lateral clearances should be indicated
Plan and Profile :
• Show the final location of new utility placements, unknown utility discoveries, relocations, and
changes . Abandoned utilities should be shown and noted .
• Show all geometric revisions to alignment, super elevation , and grade .
• Show significant changes in revised slope catches specifically ordered in the field
• Show final locations of minor structures .
• Show locations of discovered underground features, such as foundations or pipes, which are left
in place .
• Show detailed information on the location of all buried material within the County right - of
way or project limits .
• Detail any new or deleted accesses .
Drainage Plans :
• Meet the requirements of the As- Built Drawing Checklist provided in Appendix D of this
document
Prior to final acceptance of construction work, the contractor will turn in all requested as-constructed
information , materials testing information , electronic files, and submittals to the inspector for review .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA G F ! 138
The As- Built drawings shall follow the requirements for As-Constructed drawings that are set for in the
Weld County Department of Public Works Conformed Standard Special Revisions to CDOT Standard
Specifications for Road and Bridge Construction
10 . 3 MATERIALS QUALITY CONTROL AND TESTING
10 . 3 . 1 Qualifications of Testing Personnel and Laboratories
Materials Process Control testing is an important and necessary part of any successful transportation
project . Testing of construction materials ( soil , concrete , asphalt, etc . ) ensures the owner and contractor
that suppliers are providing the materials specified and adequate construction methods are being used .
CDOT qualifications related to materials are covered extensively in CDOT' s Colorado Procedure 10
( CP10 ) . It should be noted that Weld County does require the contractor to meet the qualifications for
testing personnel described in CP10 . All process control testing by consultant or material testing firms
should be done in accordance to AASHTO and ( CP ) Colorado Procedures as directed in the CDOT Field
Materials Manual - OA Frequency Guide Schedule for Minimum Materials Sampling, Testing and
Inspection .
The AASHTO and CDOT Field Materials Manuals have developed and published detailed and specific
standard procedures to be used for materials testing . The contractor will be responsible for providing
material testing that meets the requirements of the applicable testing standard . The inspector will
provide oversight to ensure material testing is being performed properly and that testing laboratories
being used are adequate .
10 .3 . 2 Minimum Testing Types and Frequencies
The contractor will make arrangements to provide material testing of the types and frequencies
described in the latest version of the Weld County Department of Public Works Conformed Standard
Special Revisions to CDOT Standard Specifications for Road and Bridge ConstructionCD-OT Field Materials
Manual OA. The inspector may accept some reduction in inspection and testing procedures under
certain conditions . If the contractor does not intend to meet the minimum testing frequencies listed in
the frequency guide schedule in the CDOT Field Materials Manuallatest version of the Weld County
Department of Public Works Conformed Standard Special Revisions to CDOT Standard Specifications for
Road and Bridge Construction , it must provide a written explanation to the inspector at least 48 hours
prior to start of the related construction .
Examples of conditions under which the minimum testing frequencies may be reduced by the inspector
could include :
• Very small quantities of materials are being used .
• The construction work is taking place outside of the roadway structural prism .
• The construction work is temporary in nature .
• The inspector has determined that construction methods being used easily exceed minimum
requirements, thereby resulting in predictable passing test results .
10 . 3 . 3 Material Sources and Sampling
All material sources used will meet the requirements of the approved plans and specifications . If the
contractor intends to use any materials that do not meet the requirements as described in the County
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 139
criteria , it must provide a written description and request prior to or at the pre -construction meeting .
The engineer then may choose to review the information and grant a variance prior to construction
starting .
The inspector will be granted access by the contractor to sample and test all material to be incorporated
into the work . Failure to allow such access will result in a suspension of work order being issued by the
engineer . The inspector reserves the right to request proof from the contractor that materials being
delivered to the jobsite are coming directly from approved sources .
All materials will be handled and delivered in a manner such that their quality and acceptability are not
adversely affected during the process . Aggregates and pavement mixes will be delivered to the jobsite in
trucks designed to prevent loss or segregation of materials . The contractor will be aware that if
materials delivered to the jobsite show excessive segregation , disturbance , or contamination , they may
be rejected by the inspector . HMA that has cooled excessively also may be rejected by the inspector .
10 . 3 .4 Required Submittals
Contractor submittals given to the County for review and approval will vary for each project, depending
o n the scope and complexity of the work to be performed . A simple Access Permit or utility crossing may
n ot justify multiple submittals, while a large -scale bridge or roadway construction project may require
many submittals . The contractor will consult with the engineer prior to the pre-construction meeting for
a specific list of required submittals . A typical large -scale project could include submission , review, and
approval of the following documents :
• MHTs
• Construction schedule
• Shop drawings or fabrication details
• Concrete and asphalt mix designs
• Soils laboratory test information
• Manufacturer' s product data and installation instructions
• Copies of required worker' s certifications and qualifications
• Certificates of compliance and material samples
• Documents required by County Codes or by the Planning Department
10 . 3 . 5 Soils Reports and Pavement Designs
To ensure proper design of roads and bridges, the department will require the contractor to provide a
soils report and associated pavement design . In certain cases, the engineer may waive these
requirements . Specific requirements are described in Chapter 9 of this document .
10 . 3 . 6 Materials Rejection
Materials that do not meet the requirements of the approved construction plans and specifications will
be rejected by the inspector. Rejected materials will be removed from the right_-of_ way in a timely
manner at the contractor' s sole expense . The contractor may choose to perform additional third - party
materials testing in an effort to reverse the inspectors' decision . However, in no case will rejected
materials be covered up or incorporated into the work without approval . In cases where the contractor
and the inspector disagree on a materials rejection issue , the engineer will make the final decision .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 140
10 . 4 EXCAVATION AND EMBANKMENT
10 .4. 1 Utility Trenching and Backfill Requirements
All utility trenches underneath or within 5 feet of a public roadway will be backfilled with suitable
materials and mechanically compacted to not less than 95 percent of maximum density, as determined
by AASHTO T99 . This work will require the contractor to arrange and pay for the applicable materials
quality control testing . The exception to this requirement is underground utilities that are bored into
place or installed by similar methods which do not disturb the surrounding soils . Alternative backfill
u sing an approved flowable cement fill ( flow-fill ) mix design can be used instead of soil materials,
e liminating the need for onsite compaction testing .
Weld County Standard Flow- Fill Mix :
• Slump of 7 to 10 inches - ASTM C143
• Compressive Strength F' C - 1, 000 PSI @ 28 days
• ASTM 150 Type I - II , minimum 329 pounds
• Course Aggregate ASTM -33 - Minimum 1, 000 pounds
• Fine Grain Aggregate ASTM - 33 - Minimum 2 , 000 pounds
• Air Entraining Agent ( SIKA Air) ASTM -C26O - Minimum 1 . 0 oz ./cubic yard
• Water— Minimum 150 pounds
All utility trenches located more than 5 feet away from a public roadway will be backfilled with suitable
materials and mechanically compacted to not less than 90 percent of maximum density, as determined
by AASHTO T99 . The inspector may choose to waive the requirement for materials testing in these cases
if s/he believes that proper construction methods are being used to ensure good compaction , or if flow-
fill is being used .
The department reserves the right to perform material testing on any utility trench being constructed
within the right - of way . If the material testing performed by the department shows that the contractor
has failed to meet or exceed the compaction requirements described above, the contractor will be
directed to remove and recompact the backfill and /or pavement materials at its own expense .
See Section 10 . 7 . 5 for Pavement Cuts and Patching Requirements .
10 .4 . 2 Unsuitable Materials
Soil materials used in embankment construction will be as recommended in the approved soils report
for the project . Soil materials that do not meet the requirements of the soils report are identified as
being " unsuitable materials" and will be removed from the jobsite .
Projects that do not have an approved soils report will follow more general requirements for the
materials to be used . Embankment and fill material will be free of ice, organics, trash , glass, chemicals,
and other deleterious materials . When tested by a Hveem Stabilometer, the soils will have a minimum
R-value of at least 10R-20 and a maximum dry density of not less than 90120 pounds per cubic foot .
10 .4. 3 Moisture and Density Control
Moisture and density control will follow CDOT' s Standard Specifications for Road and Bridge
Construction .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1141
The contractor will be responsible for material testing to confirm that proper construction methods are
being used and that the moisture and density requirements are being met . Moisture and density testing
requirements may be waived by the inspector in cases where the amount of embankment being
constructed is small or the embankment being constructed is not intended to be used for a public
roadway . However, the inspector is not authorized to waive or relax the testing requirements described
in an approved soils report .
10 . 5 SUBGRADE CONSTRUCTION METHODS
10 . 5 . 1 Unsuitable Materials
Suitability of subgrade materials is equal to that described for embankment materials in Section 10 . 4 . 2 .
Subgrade materials that are deemed unsuitable for construction will be removed from the jobsite .
10 . 5 . 2 Soft Spots
Subgrade areas that cannot be constructed initially to meet compaction requirements or support traffic
loads using standard , acceptable construction methods are commonly referred to as "soft spots . " Repair
of soft spots typically is addressed by first trying methods that require little time and expense , then
progressing to more costly methods if necessary . In cases where soft spots are numerous and extensive,
where the soft spots are so bad that standard construction equipment cannot access the area , or where
soft spots present a dangerous work condition , the contractor will consult a Professional Engineer or
Professional Geologist for recommendations for proper construction methods . The following are some
of the methods used to repair soft spots :
• Scarifying/drying/ blending the onsite soils and then recompacting
• Over-excavating and backfilling with suitable onsite soils
• Over-excavating and backfilling with imported granular fill
• Over-excavating and placing geogrid or geotextiles, then backfilling with imported granular fill
• Subgrade treatment of onsite soils with cement, fly ash , or other approved materials
The success or failure of any of these methods will be determined by extensive proof rolling and
inspection .
10 . 5 . 3 Moisture and Density Control
Subgrade moisture and compaction requirements are similar to the requirements for embankments but
are a little more stringent since subgrade materials are a component of the overall roadway structural
section . If the subgrade materials fail to meet the conditions required in the overall pavement design ,
the aggregate base and pavement sections are likely to fail prematurely . Moisture and density control
for subgrade will follow CDOT' s Standard Specifications for Road and Bridge Construction .
The contractor will be responsible for material testing to confirm that proper construction methods are
being used and that the moisture and density requirements are being met . When the final subgrade
surface elevations have been established , proof rolling and inspection will be performed before any
aggregate base is placed on top of the subgrade .
10 . 5 .4 Subgrade Proof Rolling
The department requires proof rolling of subgrade materials, observed by the inspector, to determine
their adequacy to support heavy loads . This work typically is accomplished with a heavy rubber-tire
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1142
truck, such as a water truck, that can generate a minimum axle load of 18, 000 pounds per axle . The
inspector may require the contractor to provide a certified weight ticket as proof that adequate proof
rolling equipment is being used . The subgrade will be proof rolled after the required compaction has
been verified with materials testing equipment and the subgrade has been graded to the required
elevations called for in the plans .
The inspector will be notified at least 48 hours prior to any subgrade proof rolling . No proof rolling will
be accepted without the inspector or designee present .
Upon approval of the proof rolling, the contractor will place the aggregate base course on top of the
approved subgrade materials within 48 hours . If the contractor fails to place the aggregate base course
within 48 hours or the moisture conditions of the subgrade change due to inclement weather or other
conditions, proof rolling will need to be repeated .
10 . 5 . 5 Treated Subgrades
Subgrade soils can be treated with cement, fly ash , lime, or other approved stabilizing agents . This
approach is a cost-effective way to avoid over-excavation of unsuitable soils over large areas . Subgrade
treatment also is used to raise the structural value of the soils, thereby allowing the designer to require
less thickness of aggregate base course and pavement . Another reason for the use of stabilizing agents is
to reduce the swell potential of certain clay soils .
Specific moisture and density control requirements vary, depending on the type of stabilizing agent
used . Prior to placement of any subgrade treatment, the contractor will submit a mix design to the
inspector for approval . The contractor also will supply the inspector with information regarding the type
of delivery, mixing, watering, grading, and compaction equipment to be used during construction .
10 . 6 BASE COURSE CONSTRUCTION METHODS
10 .6 . 1 Gradation and Moisture and Density Control
Overall pavement quality, including structural longevity and riding smoothness, is greatly affected by the
quality of the underlying subgrade and base course materials . Base course materials must meet
specified gradation and moisture and density control requirements to adequately support the traffic
loads . The department requires a minimum of 4 inches of compacted aggregate base course underneath
any permanent paved road surface . Depending on the pavement design , subgrade R-value, predicted
traffic loading, and other applicable factors, greater thicknesses of aggregate base course often are
required . The base course provides the pavement structure with a free-draining, non -frost-susceptible
material layer that distributes the traffic loads from the pavement surface to the underlying subgrade .
Aggregates for bases will be crushed rock, native or crushed gravels, crushed recycled concrete, or
crushed recycled asphalt materials . Base course gradation will be as specified in CDOT Specifications :
Class 5 or Class 6 materials . Class 6 Aggregate Base Course typically is used for areas directly underneath
the permanent paved surface . Class 5 Aggregate Base Course typically is used for "shouldering" the
areas adjacent to the edges of the permanent paved surface . Shouldering materials shall not contain
crushed or recycled concrete materials . Prior to any placement of materials, the contractor will submit a
laboratory gradation test to the inspector verifying specifications are being met . The contractor also will
grant the inspector access to any stockpiles or sources of base course to be used on the project .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA P A u t. 1143
The maximum compacted thickness of any individual lift of base course will not exceed 6 inches .
Multiple lifts will be required when the thickness is greater than 6 inches . Compaction of each layer will
meet a density of at least 95 percent of the maximum density determined in accordance with AASHTO T-
180 . Water should be uniformly applied to ensure this compaction requirement has been met . The final
surface elevations of the base course will be graded to within . 04' of the elevations specified on the
plans . Placement shall be performed utilizing side -dump or belly dump haul equipment . With the
exception of smaller area placement where material can be placed with little segregation using loader or
skid steer equipment . Mixing, moisture conditioning and grading shall be done with rubber-tired
equipment to prevent breakdown of aggregate and gradation . End dumping and Dozer grading is not
allowed unless authorized by a Weld County Engineer. If material is stockpiled for any length of time ,
care should be taken in the maintenance of the pile to prevent segregation of the material .
10 . 6 . 2 Base Course Proof Rolling
The department requires proof rolling of base course materials under observation of the inspector to
determine the adequacy to support heavy loads . This work typically is accomplished with a heavy
rubber-tire truck, such as a water truck, that can generate a minimum axle load of 18, 000 pounds per
axle . The inspector may require the contractor to provide a certified weight ticket as proof that
adequate proof rolling equipment is being used . The base course will be proof rolled after the required
compaction has been verified with materials testing equipment and the base course has been graded to
the required elevations called for on the approved construction plans .
The inspector will be notified at least 48 hours prior to any base course proof rolling . No proof rolling
will be accepted without the inspector or designee present .
10 .6 . 3 Treated Base Courses
Base courses can be treated with cement to obtain a stiffer and stronger material than an unbound
base . A stiffer base reduces deflections due to traffic loads, which results in lower strains on the
pavement surface . This approach can be a cost-saving measure that allows the designer to require less
thickness of pavement . Cement-treated bases need to be designed for each specific project . The
structural properties of cement-treated base depend on the soil/aggregate material , quantity of cement,
curing conditions, and age . The contractor will be responsible for submitting a mix design to the
inspector for review and approval prior to construction .
Specific moisture and density control requirements vary, depending on the cement-treated base mix
design . In addition to having an approved mix design , samples of the cement-treated base will be taken
during construction , and laboratory tests will be conducted to verify that the minimum strength
properties specified have been achieved . The contractor also will supply the inspector with information
regarding the types of delivery, mixing, watering, grading, and compaction equipment to be used during
construction . In addition , the inspector may require copies of certified weight tickets for the cement to
verify proper quantities have been incorporated into the base course . All testing of processed cement-
treated base material or its individual components, unless otherwise provided specifically in the
approved construction plans and specifications, will be in accordance with the latest applicable AASHTO
or ASTM material specifications . The final surface elevations of the cement-treated base course will be
graded to within one -quarter inch of the elevations specified on the plans .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 144
10 .6 .4 Acceptance Prior to Paving
Upon approval of the proof rolling, the contractor will place the pavement surface ( if applicable ) on top
of the approved base course materials within 48 hours . If the contractor fails to place the pavement
surface within 48 hours or the moisture conditions of the base course change due to inclement weather,
excessive drying, or other conditions, proof rolling will need to be repeated .
The inspector is responsible for giving the contractor final approval to proceed with placement of the
pavement surface on roads and bridges within the right--of- way . The contractor will furnish copies of
certified load tickets for the base course materials as proof that the correct type and quantity of base
course was delivered to the jobsite . When the inspector determines that base course placement is
acceptable, a pre- paving meeting can be held .
10 . 7 PAVEMENT CONSTRUCTION METHODS
10 . 7 . 1 Pre - Paving Meetings
Pre- paving meetings are mandatory on any road or bridge project that requires placement of asphalt or
concrete permanent pavement more than 50500 tons of HMA pavementHMA Pavement or 2 , 000 CYSY
of Concrete PavementConcrete Pavement . The meetings will be scheduled and arranged with the
inspector . Attendees at the pre - paving meeting generally include the contractor superintendent, paving
foreman , materials quality control tester, TCS, material supplier representative, engineer, and inspector .
The asphalt or concrete mix design will be submitted , reviewed , and approved by the inspector prior to
the pre - paving meeting .
Pre - paving meetings typically are held on the jobsite . Following is a partial list of the general items for
discussion :
• Introductions and attendance roster with contact information
• Assignment of specific duties
• Scheduling, construction sequencing, and traffic control requirements
• Materials quality control methods and requirements
• Types of hauling equipment and paving equipment to be used
• Construction details, such as lift thicknesses, joint construction , and pavement striping
• Conditions under which paving will cease ( bad weather, darkness, holidays, etc . )
10 . 7 . 2 Recycled Asphalt Pavement Surfaces
Weld County has constructed roads using recycled asphalt pavement ( RAP ) as the pavement surface for
interim cross sections instead of gravel . This typically is accomplished as a permanent means of dust
control and is less costly than HMA . Candidate roads for RAP pavement are gravel roads that have a high
e nough ADT to make grading and dust control maintenance a significant effort, but low enough ADT to
n ot warrant permanent HMA pavement placement .
10 . 7 . 3 Hot Mix Asphalt Surfaces
Most County roads with permanent paved surfaces are constructed with HMA . This type of surfacing
suits the County needs well since our road crews are knowledgeable and well equipped to properly
maintain asphalt roads .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1145
The current edition of the CDOT Standard Specifications for Road and Bridge Construction, Sections 400,
403 , 702 and 703 provide material specifications and construction methods generally acceptable to
Weld County . Table 9 -8Table 9 -9 has the Master Range gradation requirements for Grading S ( %" ) on
bottom , intermediate lifts and SX ( % " ) for top lift placement are acceptable . Designs will require
Performance Graded Binder of 64-22 on bottom and intermediate lifts, while top lifts will have 64- 28
( Table 702 - 1 in CDOT's Standard Specifications for Road and Bridge Construction ) , other binder grades
must be approved in writing by Weld County Engineer. Design air voids will be targeted at 3 . 5 -4 . 5 %
under 100 gyrations . No more than 20% Recycled Asphalt may be used in the bottom and intermediate
lifts . Top lift will utilize virgin aggregate in the mix design . No asphalt shingles can be used in the
recycled asphalt products .
Prior to any asphalt placement, the contactor will submit an asphalt mix design to the inspector for
approval , as described in Section 401 .02 ( a ) ( 1 ) and ( 2 ) of the CDOT Standard Specifications .
The inspector reserves the right to perform a site visit and inspect the facilities of any asphalt supplier
used . During construction , the contractor will furnish copies of certified load tickets for the pavement
materials as proof that the correct type and quantity of pavement materials were delivered to the
jobsite .
The minimum and maximum layer thickness will be as specified by CDOT Specifications for the type of
asphalt mix being used , or as otherwise specified in an approved pavement design report . The use of
geosynthetics associated with asphalt pavement or mill/overlay operations will be approved by the
engineer prior to use .
10 . 7 .4 Concrete (PCCP) Surfaces
PCCP construction is encouraged for high -volume intersections, industrial developments, and heavy
truck routes . CDOT Specifications Section 412 provides material specifications and construction methods
generally acceptable to the department . Prior to any concrete placement, the contactor shall submit
construction plans which follow all the requirements in this guide but also include a joint layout plan and
a construction phasing plan . The following standards including but not limited to the following shall be
included in the project :
1 . The Contractor shall also submit an optimized gradation concrete mix design to be reviewed and
approved by the County .
2 . A PCCP design shall be provided using the mechanistic empirical ( ME ) design criteria . If the
recommended pavement thickness is less than 119 inches, the minimum concrete thickness
shall be 119 inches . If the recommended concrete pavement thickness is more than 119 inches,
the greater thickness shall be used . The minimum thickness of Class 6 ABC is 6 inches unless a
greater thickness is recommended by the design .
3 . A minimum of 1 layer of Tensar TX 160INTERAX NX650 geogrid or approved equivalent shall be
placed beneath the Class 6 ABC and the subgrade on all PCCP project . The manufacturer' s
requirements for overlap shall be followed . Additional layers of TX- 160 INTERAX NX650 shall be
required if stability and compaction of the subgrade cannot be achieved .
4 . The concrete mix design shall contain no more than 20% fly-ash
5 . Only non -chloride High early strength concrete mix designs may be used in some situations if
submitted and approved by the County prior to construction .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1146
6 . All acceleration and deceleration lanes shall have a 4-foot PCCP shoulder and a 2 -foot gravel
shoulder . The gravel shoulder shall be composed of either Class 6 ABC or RAP .
7 . All other PCCP travel lanes shall have an 8 -foot PCCP shoulder and a 2 -gravel shoulder .
8 . A safety edge is required for the full length of the PCCP lanes except at driveway locations .
9 . If an existing PCCP road is being widened , the existing safety edge and shoulder shall be
removed prior to the construction of additional lanes . The additional lanes shall be constructed
with a safety edge .
10 . The minimum 28 - day flexural strength for concrete paving shall be a minimum of 650 psi . Any
concrete paving found to be less than this shall be removed and replaced .
11 . All other material submittals such as aggregates, cement, joint sealant, curing compound , dowel
bars, and tie bars shall be approved by the County prior to any concrete being placed .
12 . Non -flexible fusion bonded epoxy coated ( purple or black ) carbon steel bars ( dowels ) shall be
used in the wheel paths for load transfer between panels . The Simplex Time Capsule or
ArmorCoat dowel bars are acceptable .
13 Dowel bar sizes vary depending on pavement thickness and expecting loading . Never to be less
than 1 . 25" .
13 . 14 . All epoxy coated Tie Bars used in concrete pavement eointing will have no bare steel
ends and require coating of epoxy paint prior to placement .
X4: 15 . The transition between PCCP and HMA shall follow the Weld County PCCP to HMA
transition detail .
15 . 16 . Concrete paving shall be finished using a moistened doubled burlap drag for texture .
Concrete texturing shall occur prior to curing compound being placed .
16 . 17 . All non - standard sized concrete panels shall be reinforced with 6 -gauge welded wire
mesh
17 . 18 . Concrete curing compound shall be White Water Linseed Oil Concrete Curing and Anti -
spalling Compound or approved equivalent .
18 . 19 . Joint sealant shall be Dow Corning 890 SL joint sealant or approved equivalent .
19 . 20 . Pavement markings placed onto finished concrete pavement shall follow Table
1O ' Table 1O 1 below .
Table 10-1 Pavement Marking Types on Asphalt and Concrete Roadways
Surface Type Line Type Material Type CDOT ITEM #
6" White Edge Line Modified Epoxy 627-00008
4 " Yellow Edge Line Modified Epoxy 627 -00008
4" Double-Yellow Centerline Modified Epoxy 627 -00008
Existing 4" White Extension Line Modified Epoxy 627-00008
Asphalt 4" White Skip Lane Line Modified Epoxy 627-00008
8" White Gore Area Modified Epoxy 627-00008
8" White Channelizer Modified Epoxy 627-00008
8" White Lane Drop Modified Epoxy 627-00008
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1147
8 " White Double- Left Guide Modified Epoxy 627-00008
Preformed Thermoplastic ( Inlaid ) 627.30411 or
Stop Bar/Xwalk or Preformed Plastic Type I 627-30328
( Inlaid)
Preformed Thermoplastic ( Inlaid) 627-30407 or
Word Message/Symbol or Preformed Plastic Type I 627-30323
( Inlaid ;
6" White Edge Line Modified Epoxy 627-00008
4" Yellow Edge Line Modified Epoxy 627-00008
4" Double-Yellow Centerline Modified Epoxy 627-00008
4" White Extension Line Modified Epoxy 627-00008
4" White Skip Lane Line Modified Epoxy 627-00008
8" White Gore Area Modified Epoxy 627-00008
New Asphalt
8" White Channelizer Modified Epoxy 627-00008
8" White Lane Drop Modified Epoxy 627-00008
8" White Double- Left Guide Modified Epoxy 627-00008
Stop Bar/Xwalk Preformed Thermoplastic ( Inlaid ) 627-30411 or
or Preformed Plastic Type I ( Inlaid ; 627-30328
Preformed Thermoplastic ( Inlaid ) 627-30407 or
Word Message/Symbol or Preformed Plastic Type I ( Inlaid ) 627-30323
6" White Edge Line Preformed Plastic Type II ( Inlaid) 627-02010
4" Yellow Edge Line Modified Epoxy 627-00008
4" Double-Yellow Centerline Modified Epoxy 627-00008
4" White Extension Line Modified Epoxy 627-00008
4" White Skip Lane Line Preformed Plastic Type II ( Inlaid ) 627-02010
Existing & New 8" White Gore Area Modified Epoxy 627-00008
Concrete
8" White Channelizer Preformed Plastic Type II ( Inlaid) 627-02010
8" White Lane Drop Preformed Plastic Type II ( Inlaid) 627-02010
8" White Double- Left Guide Preformed Plastic Type II (Inlaid ) 627-02010
Preformed Thermoplastic (Inlaid) 627-30411 or
Stop Bar/Xwalk or Preformed Plastic Type I 627-30328
flnlaid )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1148
•
Preformed Thermoplastic ( Inlaid)
Word Message/Symbol or Preformed Plastic Type I 627-30407 or
yp 627-30323
( Inlaid )
Rollover Curb in Roundabouts Modified Epoxy — Yellow with 627-00008
reflective beads
Paveme
Pavement Marking Material Type & Placement
Materia
I
/16 " White Edge Line Epoxy
/I6 " Yellow Edge Line Epoxy
4" Double-Yellow Centerline Epoxy
4 " White Extension Line — Match line width being
Epoxy
extended
Existing Preformed Plastic Type I ( Surface
& New 8 " White Gore Area
Applied )
Concret
� Preformed Plastic Type I ( Surface
8 " White Channelizer
Applied }
8 " White Lane Drop Preformed Plastic Type I ( Inlaid )
8 " White Double Left Guide Preformed Plastic Type I ( Inlaid )
Stop Bar/Symbol Preformed Plastic Type I ( Inlaid}
Word Message Preformed Plastic Type I ( Inlaid )
20 . 21 . For epoxy pavement markings, the concrete curing compound must be removed along
the marking layouts prior to placement of the epoxy . This can be accomplished using
pressurized water or other methods as approved by the County .
The County reserves the right to perform a site visit and inspect the facilities of any material supplier
used during construction . The contractor shall furnish copies of certified load tickets for the pavement
materials as proof that the correct type and quantity of pavement materials were delivered to the
jobsite .
Traffic control requirements for PCCP construction are a major concern because of the concrete curing
time requirements .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PiAuE 1149
10 . 7 . 5 Pavement Cut and Patching Requirements
Some roadways in Weld County have a " No Cut" policy in place . Consult with the Public Works
Department to find out which roads fall under this policy . Construction work that requires removal of
existing paved surfaces will require replacement with similar new pavement materials within a period of
48 hours, unless otherwise approved by the inspector . Traffic control devices will not be removed until
after the paved surface has been replaced . Removed RAP surfaces will be replaced with HMA .
Where pavement is to abut existing pavement, the existing pavement shall be removes to a neat vertical
line, using a saw or other method as approved , to create a clean construction "T-Joint" . The contractor
will also be required to paint the edge with diluted emulsified asphalt ( slow setting ) prior to paving
operations . The rate of application shall be as determined by the engineer at the time of application .
Contractor shall mill existing roadway to a minimum depth of 2 inches . The milling shall be a minimum
of 2 feet wide or a greater width so that the joint will not fall within the intersecting travel lane wheel
path .
Construction in the winter will require temporary asphalt patching using cold - mix materials, then
returning to the site to reconstruct with permanent patching using hot- mix materials when weather
conditions allow . All pavement removals will be saw-cut a minimum of 1 foot wider than the patching
area . The new pavement patch material will be placed and compacted to a thickness at least 1 inch
greater than the adjacent in - place pavement . The minimum dimension of both length and width of any
pavement patch will be at least 4 feet to ensure adequate compaction can be obtained . The inspector
may choose to waive the requirement for pavement surface materials testing if they believe that proper
construction methods are being used to ensure good compaction .
Pavement cut and patching requirements for concrete pavements will require review and approval by
the inspector . Concrete patching typically requires insertion of steel dowel bars into the adjacent
pavement . Proper curing and jointing methods also must be used .
Improper construction of pavement patches is a problem in Weld County . Poor construction methods
may result in dangerous bumps or dips in the traveled roadway . If such conditions are identified by the
department within two years after construction , the contractor will be notified in writing to reconstruct
the pavement patch properly . Failure to meet the conditions described in the written notice from the
department can result in emergency repairs being performed by County crews . In such cases, the
contractor will be invoiced to reimburse the County for all costs associated with the road repairs .
10 . 8 STRUCTURES AND DRAINAGE FEATURES
10 .8 . 1 Bridges
Unless otherwise approved by the engineer, bridges will be designed and constructed according to the
most current requirements of AASHTO ' s LRFD Bridge Design Specifications, CDOT' s Bridge Design
Manual, CDOT Standard Specifications, and CDOT Standard Plans . If alternate designs or construction
methods are being proposed by the contractor, the engineer will provide specific submittal
requirements . The design and construction of any bridge within the County right_ of- way will be
overseen by a Professional Engineer licensed in the state of Colorado .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 150
10 .8 . 2 Culvert and Pipe Installation
Culvert and pipe installation will be completed according to the requirements of CDOT Specifications
Section 603 and Standard Plans, unless otherwise described in Chapter 5 . 6 .4 and Chapter 5 . 8 of this
document . Pipes constructed in right of ay for private driveway access in rural areas will be at least
CMP, or an approved equal , and will have a minimum diameter of 15 inches . Pipes constructed under
the travel lanes of a new public roadway will be RCP, or an approved equal , and will have a minimum
diameter of 15 inches . All culverts and pipes must be installed with a minimum of 12 inches of cover
above the pipe crown and bell to the bottom of asphalt at the edge of pavement ( for paved roads ) and a
minimum of 12 inches of cover above the pipe crown to the top of the finished grade ( for gravel roads ) .
If 12 inches of cover is not possible , the culvert material must be rated for a minimum of HS- 20 loading
or the largest expected loads crossing it ( i . e . , oil rigs, semi -trucks, etc . ) .
The contractor must provide shop drawings for any precast concrete box culvert ( CBC ), which will be
reviewed and approved for use by the engineer. HDPE, ADS, or other plastic pipes that cannot withstand
fire will not be allowed .
It will be the responsibility of the contractor to protect pipe materials from damage during shipping,
unloading, and installation . Any damaged pipe materials ( as determined by the inspector) will be
removed from the jobsite . The construction elevation tolerance for pipes will be within 0 . 5 inches of the
design elevation called for on the approved plans .
10 .8 . 3 Curbs, Gutters, and Crosspans
Construction will be according to the requirements of CDOT Specifications Section 609 and Standard
Plans, or as otherwise described in Chapter 5 of this document . All curbs, gutters, and crosspans will be
constructed of CDOT Class D concrete or an approved equal . All gutters and cross pans shall be 8" thick
minimum . Asphalt curbs are permitted for bridge construction only .
All outflow curb and gutter will be CDOT Type 2 — Section IB, unless otherwise approved . All inflow curb
and gutter will be CDOT Type 2 — Section IIB, unless otherwise approved . All mountable curb shall be
CDOT Type 2 Section IM or Section IIM , unless otherwise approved . All crosspans will be CDOT Gutter
Type 2 with a minimum thickness of 6 inches, unless otherwise approved . The minimum vertical slope
for all gutters and crosspans will be 0 . 5 percent . Minimum width of 8 feet .
10 .8 .4 Concrete Structures, Manholes, and Inlets
Construction will be according to the requirements of CDOT Specifications Section 601 and Standard
Plans, or as otherwise described in Chapter 5 . 6 of this document . All irrigation structures will be
reviewed and approved by the applicable irrigation company or board prior to construction .
All concrete structures, manholes, and inlets will be constructed with steel reinforcement as shown on
the approved construction plans . The contractor will be responsible for concrete quality control testing
for all cast- in- place concrete construction . The contractor will request an inspection of the concrete
formwork by the inspector a minimum of 24 hours prior to concrete placement .
10 .8 . 5 Retaining Walls and Slope Stabilization Measures
Any retaining walls 4 feet tall or higher that are to be constructed in the right of- way will be designed
( and designs will be stamped ) by a Professional Engineer licensed in the state of Colorado . The
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1 151
contractor will submit detailed plans for approval by the department prior to construction . Retaining
wall foundations must follow the recommendations provided by the geotechnical engineer . Modular
block retaining walls will be constructed per the manufacturer' s specifications . Retaining walls will be
located such that they ensure adequate clear distance from the wall to the edge of the roadway and so
do not pose a risk to the traveling public . Any retaining wall constructed in an urban or residential area
and greater than 4 feet in height will incorporate a railing or fence for fall protection .
Non -structural erosion control measures for slopes ( blankets, turf reinforcement mats, etc . ) will be
installed per the manufacturer' s specifications . Structural slope stabilization measures ( riprap, gabions,
soil anchors, slope mattresses, etc . ) will be designed , and designs will be stamped , by a Professional
Engineer licensed in the state of Colorado . The contractor will submit detailed plans for approval by the
department prior to construction .
10 . 9 OTHER ROADWAY FEATURES
10 .9 . 1 Pavement Markings
All roadways and bridges constructed will receive permanent pavement markings ( striping ) prior to the
construction traffic control devices being removed . The contractor will ensure that all pavement
markings have been designed and located according to the requirements of the MUTCD . All permanent
line striping will be done with epoxy paint materials applied according to the manufacturer-
recommended methods at 15 mils minimum thickness, unless otherwise approved by the department .
Both pavement and air temperatures will be at least 50 degrees and rising at the time of pavement
marking . All permanent words, symbols, stop bars, crosswalks, etc . , will be pre -formed thermoplastic
pavement markings capable of being affixed to the asphalt pavement surface by heating, unless
otherwise approved by the department . The minimum pavement and air temperature will be as
recommended by the manufacturer. The contractor will submit a copy of the manufacturer installation
recommendations to the inspector prior to application .
10 .9 . 2 Traffic Control Devices (Signs and Signals)
Installation of all permanent traffic control devices within the right-of-way is to be approved and
overseen by the department . Traffic control device materials and manufacturers will meet the
requirements of CDOT Specifications Section 713 and the latest version of the MUTCD . Installation of
traffic control devices will meet the requirements of CDOT Specifications Section 614 and the latest
version of the MUTCD .
Construction of traffic signals within the right-of-way with the intention of turning over ownership of the
traffic signal to the County will require specific design guidance and approval by the department .
10 .9 . 3 Trees and Plantings
Weld County does not encourage the placement of any trees or plantings within the right-of-way that
require an irrigation system . Any trees or plantings proposed to be used will be able to survive under
non - irrigated conditions .
Trees and plantings will be located such that they do not present a safety hazard to the traveling public
by ensuring adequate clear zone distance from the trees and plantings to the edge of the roadway .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA t-J A G E 1152
Trees and plantings will be of the species and varieties previously approved for use by the department .
The contractor will obtain certificates of inspection of plant materials that are required by federal , state,
or local laws, and will submit the certificates to the department for approval prior to planting . All
delivered plant materials will be free from plant diseases and insect pests . All plant materials are subject
to the two -year warranty period . The contractor is responsible for removing and replacing any dead
plant materials that have been identified by the department prior to the end of the warranty period .
10 .9 .4 Sidewalks and Trails
Any permanent sidewalk, bikeway, or trail within the right- of-way will be constructed with concrete or
HMA, with a minimum thickness of 4 inches . The minimum width of the completed surface will be
5 feet . All completed surfaces will have a maximum cross slope of 1 . 8 percent to ensure proper drainage
and comply with the Americans with Disabilities Act ( ADA ) . Sidewalks will be constructed with concrete
curb ramps and will comply with ADA requirements .
Before any surfacing is placed , clearing and grubbing, tree removal , grass and brush removal , and topsoil
removal will be completed . The existing ground then will be thoroughly compacted to not less than
90 percent of maximum density as determined by AASHTO T99 . Materials testing requirements may be
waived by the inspector if the amount of sidewalk being constructed is minimal or the construction
methods being used are obviously adequate to ensure required results .
10 .9 . 5 Guardrails
All new guardrail placed within the right-of-way will be CDOT Midwest Guardrail System ( MGS ) . Any
contractor installing guardrail will be pre - qualified with CDOT for this specific type of construction ( work
type 14 ) . The contractor will be responsible for providing and maintaining traffic control devices until
the guardrail construction has been entirely completed , inspected , and approved for use by the
inspector.
10 .9 . 6 Fences
New fences constructed within the right -of-way will be in accordance with CDOT Specifications Section
607 and Standard Plans No . M - 607- 1 (Wire Fences and Gates ) . In cases where a contractor is replacing
an existing fence , the adjacent landowner and the inspector should be consulted regarding acceptable
fencing materials . In all cases, the contractor will obtain permission to enter upon adjacent private land .
Construction of fences intended to be located on the right-of-way line will be surveyed and staked prior
to construction . If the locations of the right-of-way line or adjacent property lines are in question , the
department will be consulted for assistance . All fences will be designed and constructed in a manner
that does not adversely impact the sight distance for vehicles, especially near roadway intersections .
In urban or developed areas, standard barbed -wire fences are not the preferred type . Developers and
landowners can make use of many other fence types that will better fit the needs . The department will
be consulted and will review specific requests prior to construction .
The contractor will perform clearing and grubbing as necessary to construct the fence to the required
grade and alignment . At locations where fence posts or anchors need to be imbedded in concrete,
adequate bracing will be left in place until the concrete has hardened . The tops of all posts will be set to
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1153
the required grade and alignment . Avoid cutting off the tops of treated wooden posts . All gates will be
galvanized steel or factory- painted , unless otherwise approved .
10 .9 . 7 Cattle Guards
In Weld County, cattle guards are used to keep cattle or other grazing animals off the right-of-way . New
cattle guards constructed within the right of wayright-of-way will be in accordance with CDOT
Specifications Section 611 and Standard Plans No . M -611 - 1 ( Cattle Guard ) . A written agreement similar
to the agreement found in Appendix 8-C of the Weld County Code must be received by the Public Works
Department prior to installation . The contractor will obtain permission to enter upon adjacent private
land , if necessary, for construction and will make arrangements for temporary access with the affected
landowner( s ) .
The deck area of all cattle guards will be constructed of steel , and all hardware will be galvanized steel .
The contractor will ensure that concrete has sufficient time for curing and strength gain prior to allowing
traffic to use the new cattle guard . The contractor will be responsible for providing a temporary means
of controlling cattle or other grazing animals during construction .
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1154
CHAPTER 11 PERMITTING
The following permits are issued by the Public Works Department or the Planning and Zoning
Department, as indicated . Additional information regarding any of the permits, including application
forms, can be found on the Weld County website .
11 . 1 TRANSPORT PERMIT
The Transport Permit is issued by the Public Works Department and is required when vehicles using the
County road network are overweight, over-sized , or both . It is issued for standard overweight or over-
sized load vehicles and for oil rigs drilling in the County . Permit conditions or restrictions may apply to
these vehicles and are listed on the application form . When a permit for this application is issued by
Weld County, the permit is subject to the conditions described with the understanding that no liability is
assumed by Weld County by reason of its issuance . With regard to the condition of roads or capacity of
culverts and bridges, the applicant must examine and inspect the adequacy of roads and bridges for
traffic movement . In case of an emergency, an authorized Weld County employee or an authorized
agent may suspend the permit until emergency conditions have passed . ( See Weld County Code,
Chapter 8, Article XV, Sec . 8 - 15 - 10, et seq . )
11 . 2 RIGHT - OF-WAY USE PERMIT
The Right-of-Way Use Permit, issued by the Public Works Department, is a tool to help regulate
unauthorized obstructions of, excavations in , and use of the County' s rights of way and easements by
requiring permits for all construction activities within the Weld County rights of way or easement and
provide for the subsequent restoration upon completions . A Right-of-Way Use Permit grants a permit
holder permission to occupy, excavate , survey, perform locations, or construct facilities within the
County rights of way or easements and provide for the subsequent restoration upon completion . ( See
Weld County Code, Chapter 8 , Article XIII , Sec . 8- 13 - 10, et seq . )
Right-of-way Use Permit instructions and application can be found at :
works/ permitshttps ://www . weld .gov/Government/De
partments/ Public-Works/Permits/ Right-of-Way- Permits .
11 . 3 ACCESS PERMIT
Land use, natural resources recovery, general utilities, and development have impacts on County roads .
The requirement for Access Permits, issued by the Public Works Department, recognizes that the
efficiency and safety of County roads depends on minimizing roadside interference and its detrimental
effect upon the movement of traffic . The Access Permit sets out minimum requirements for the design ,
construction , and maintenance of accesses . ( See Weld County Code, Chapter 8, Article XIV, Sec . 8- 14- 10,
et seq . )
11 .4 GRADING PERMIT
The Grading Permit, issued by the Public Works Department, is a tool to ensure that the County has
reviewed the grading plan , the erosion and sediment control plan , and the utility map for proposed
construction activities with the goal of avoiding potential damages . A Grading Permit grants the Permit
Holder permission to conduct construction activities within the requirements of applicable state
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGF 1155
regulations and provides the County with sufficient oversight to minimize the potential for offsite
damages .
A Grading Permit will be required if disturbing more than one acre or any earth disturbance in an MS4
area per the MS4 criteria within this document . ( See Weld County Code, Chapter 8, Article XII , Sec . 8- 12 -
101 et seq . )
11 . 5 FLOODPLAIN DEVELOPMENT PERMIT
The Floodplain Development Permit is issued by the Planning and Zoning Department . ( See Weld County
Code, Chapter 23 , Article XI , Sec . 23 - 11 -200, et seq . )
WELD COUNTY ENGINEERING & CONSTRUCTION CRITERIA PAGE 1156
CHAPTER 12 VARIANCE REQUESTS
The County recognizes that in certain limited instances it may be exceptionally difficult to conform to
the criteria set forth in this manual and the Weld County Code . The County will consider requests for
variances on a case - by-case basis . The variance request will be submitted in a written attachment to the
initial submittal of construction plans . Drainage variances are addressed in Section 8- 11 - 160 of the Weld
County Coderequire the use of a request form found on the County website. All other requests will
consist of the following :
1 . Identification of the criteria or Weld County Code section to be waived or varied
2 . Identification of the construction criteria adhered to
3 . Justification for the variance, which will demonstrate the following :
• Hardship is created if the variance is not approved . The hardship shall be specific to the
subject property, rather than general in nature such as cost, and shall not have been self-
imposed by the applicant or their predecessors in title to the property .
• There will be only minimal impact on public safety .
• The variance is not contrary to best engineering practices .
• The variance is not contrary to the intent and general purpose of these criteria and the Weld
County Code .
• The variance does not result in a significant impact to the public due to maintenance of the
improvement .
• The variance does not result in a significant impact to the aesthetic appearance of the
improvement .
• The variance is the minimum exception from the criteria necessary to afford relief from the
hardship .
• The variance is reasonably necessary for the health , safety, and welfare of the public .
The variance request shall wilt be prepared , stamped , signed , and dated by a professional civil engineer
licensed to practice in the State of Colorado . Requests will be reviewed by the Public Works Director or
his/ her designee . The Public Works Director, or his or her designee , shall only approve the variance
request if the applicant has demonstrated the : ustification required above .
The Public Works Director reserves the right to deny, or allow his or her designee to deny, any request
for variance if doing so is in the interest of public health , safety, and welfare .
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WELD COUNTY ENGINEERING&CONSTRUCTION CRITERIA PAGE 1158
APPENDIXA-Weld County Drainage Basin Map
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APPENDIX B-Drainage Report Checklist
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APPENDIX C-CDOT Operations and Maintenance Plan Guidelines
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APPENDIX D-As-Built Drawing Checklist
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APPENDIX E-USDCM 2007 Runoff Coefficients
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APPENDIX F-Rational Formula-Based Modified FAA Procedure
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APPENDIX G-Grading Permit Checklist
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APPENDIX H - MS4 Pollution Prevention Plan Checklist and Manual
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APPENDIX I-Traffic Impact Study Checklist
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APPENDIX J-Weld County Standard Details
WELD COUNTY ENGINEERING&CONSTRUCTION CRITERIA
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