HomeMy WebLinkAboutMULBERRY CONNECTION - FDP200030 - - STORMWATER MANAGEMENT PLANMulberry Connection
AT
Redman Drive and I-25 Frontage Road
STORMWATER MANAGEMENT PLAN (SWMP) REPORT
DECEMBER 2020
Prepared By:
Mulberry Connection│SWMP REPORT 2
TABLE OF CONTENTS
SWMP PREPARER CERTIFICATION ........................................................................................ 5
PERMITTEE / OPERATOR RESPONSIBILITIES ....................................................................... 6
OWNER/PERMITTEE CERTIFICATION ..................................................................................... 7
OPERATOR/PERMITTEE CERTIFICATION............................................................................... 7
SUBCONTRACTOR CERTIFICATION ....................................................................................... 8
SUBCONTRACTOR CERTIFICATION ........................................................................................ 8
SUBCONTRACTOR CERTIFICATION ........................................................................................ 8
SUBCONTRACTOR CERTIFICATION ........................................................................................ 8
GENERAL REQUIREMENTS ......................................................Error! Bookmark not defined.
INTRODUCTION AND PURPOSE ................................................Error! Bookmark not defined.
PERMIT COVERAGE AND APPLICATIONS .................................Error! Bookmark not defined.
DEFINITIONS ...............................................................................Error! Bookmark not defined.
SITE DESCRIPTION....................................................................Error! Bookmark not defined.
GENERAL PROJECT DESCRIPTION ...........................................Error! Bookmark not defined.
PROJECT CONTACTS ............................................................................................................. 13
PROJECT LOCATION ..................................................................Error! Bookmark not defined.
VICINITY MAP ..............................................................................Error! Bookmark not defined.
HISTORICAL LAND USE ..............................................................Error! Bookmark not defined.
EXISTING SITE CONDITIONS ....................................................Error! Bookmark not defined.
THREATENED AND ENDANGERED SPECIES ............................Error! Bookmark not defined.
WETLANDS ..................................................................................Error! Bookmark not defined.
DRAINAGE CHARACTERISTICS .................................................Error! Bookmark not defined.
VEGETATION ...............................................................................Error! Bookmark not defined.
SOILS Error! Bookmark not defined.
SITE AND DISTRUBED AREAS ...................................................Error! Bookmark not defined.
RAINFALL DATA ..........................................................................Error! Bookmark not defined.
RECEIVING WATERS ..................................................................Error! Bookmark not defined.
PROPOSED SITE CONDITIONS.................................................Error! Bookmark not defined.
3 Mulberry Connection │SWMP REPORT
PROJECT DESCRIPTION ............................................................Error! Bookmark not defined.
TOPOGRAPHY AND DRAINAGE CHARACTERISTICS ...............Error! Bookmark not defined.
PROPOSED CONSTRUCTION ACTIVITIES ............................................................................ 14
EROSION CONTROL PLAN REQUIREMENTS ....................................................................... 22
STORMWATER MANAGEMENT CONTROLS ............................Error! Bookmark not defined.
QUALIFIED STORMWATER MANAGER ......................................Error! Bookmark not defined.
SITE SPECIFIC POLLUTION SOURCES......................................Error! Bookmark not defined.
IDENTIFICATION OF POLLUTANT SOURCES ............................Error! Bookmark not defined.
BEST MANAGEMENT PRACTICES FOR STORMWATER POLLUTION PREVENTION .....Error!
Bookmark not defined.
FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT .Error! Bookmark
not defined.
INSPECTION REQUIREMENTS..................................................Error! Bookmark not defined.
INSPECTION SCHEDULE REQUIREMENTS ........................................................................... 22
INSPECTION PROCEDURES .................................................................................................. 22
CONTROL MEASURE MAINTENANCE / REPLACEMENT AND FAILED CONOTROL
MEASURESS ........................................................................................................................... 24
CONCLUSIONS ...........................................................................Error! Bookmark not defined.
REFERENCES ............................................................................Error! Bookmark not defined.
APPENDIX ................................................................................................................................ 26
Mulberry Connection│SWMP REPORT 4
APPENDIX A –SITE SPECIFIC REPORTS
· SOIL INFORMATION
· FIRM MAP
· THREATENED AND ENDANGERED SPECIES
APPENDIX B –EROSION CONTROL PLANS
APPENDIX C –PERMIT INFORMATION
· SITE SPECIFIC CDPHE PERMIT (TO BE INCLUDED UPON RECEIPT)
· SITE SPECIFIC CDPHE FACT SHEET TO BE INCLUDED UPON
RECEIPT)
· CDPHE CDPS GENERAL PERMIT – CONSTRUCTION ACTIVITY
· CDPHE CDPS GENERAL PERMIT – CONSTRUCTION DEWATERING
ACTIVITIES
· CDPHE CDPS GENERAL PERMIT – APPLICATION GUIDANCE
DOCUMENT
APPENDIX D –EXAMPLE LOGS
· OUTDOOR STORAGE OF MATERIALS LOG
· VEHICLE EQUIPMENT MAINTENANCE AND FUEING LOG
· ROUTINE MAINTENANCE LOG
· ONSITE WASTE MANAGEMENT LOG
· NON-INDUSTRIAL WASTE SOURCES LOG
· ADDITIONAL POLLUTANT SOURCES LOG
· LAND DISTURBANCE / CONTROL MEASURE INSTALLATION /
STABILIZATION LOG
· CONSTRUCTION STORMWATER SITE INSPECTION REPORT
· CONTROL MEASURE CORRECTIVE ACTION LOG
APPENDIX E –Spill reporting
· CDPHE ENVIRONMENTAL SPILL REPORTING
APPENDIX F –CONTROL MEASURE DETAILS
5 Mulberry Connection │SWMP REPORT
SWMP PREPARER CERTIFICATION
This Stormwater Management Plan (SWMP) has been prepared by me, or under my direct supervision, in
substantial accordance with the requirements of the City of Fort Collins, (the “City”) Stormwater Criteria
Manual.
Daniel L. Skeehan, P.E
Colorado Registered PE # 46391
Project Design Engineer
Mulberry Connection│SWMP REPORT 6
PERMITTEE / OPERATOR RESPONSIBILITIES
This Stormwater Management Plan (SWMP) is prepared for Armie Management, LLC (the “Site Developer”)
to fulfill the erosion control requirements for the City of Fort Collins (the “City”) and the State of Colorado
Department of Public Health and Environment (CDPHE) for the Mulberry Connection Project (the “Project”).
This narrative, in conjunction with the Erosion Control Plans included in Appendix A, examines measures
taken onsite to improve stormwater quality leaving the site, and also addresses important erosion control
measures implemented prior to and during construction. A general overview of the procedures outlined in
the SWMP which the Operator (the “Contractor”) shall follow is provided below for reference.
Responsibility
Operator
1. Submit the applicable City and CDPHE Permit Applications, copies
of which is provided in the Appendices.¨
2. Complete the Permittee / Operator SWMP Certifications provided
within the SWMP Narrative.¨
3. Complete the Operator / SWMP Administrator Contact Information
identified in the SWMP Narrative.¨
4. Post the Site in accordance with the requirements identified on the
Erosion Control Plans included in the appendices of this report.¨
5. Commence Control Measure installation and construction in
accordance with the Phased Control Measure Implementation.¨
6. Schedule and Complete a Stormwater Management Pre-
Construction Meeting.
¨
7. Complete Land Disturbance / Control Measure / Site Stabilization
Log, a copy of which is included in the appendices of this report.¨
8. Complete Inspections in accordance with the SWMP Inspection
Schedule and Procedures outlined within the SWMP Narrative.¨
9. Complete field maintenance or field modifications to Stormwater
Management Practices based upon the results of the Inspection.¨
10. Maintain current records of the SWMP Inspections in accordance
with the Inspection Record Keeping identified in the SWMP
Narrative.
¨
11. Maintain current records of the Land Disturbance / Control
Measure / Site Stabilization Log, a copy of which is included in the
appendices of this report.
¨
12. Maintain current records of the Control Measure Corrective Action
Log, a copy of which is included in the appendices of this report.¨
13. Maintain current records of the SWMP Amendment Log, a copy
which is included in the appendices of this report.¨
14. Achieve Final Stabilization in accordance with the Final
Stabilization practices outlined within the SWMP Narrative.¨
15. File the applicable City/CDPHE Construction Stormwater
Inactivation Notice.¨
This summary is provided for Permittee / Operator convenience only and shall not be considered all
inclusive with respect to stormwater management responsibilities. The Permittee / Operator shall
familiarize themselves with the City requirements and SWMP, and implement stormwater management
strategies based upon the recommendations identified herein and varying site conditions.
7 Mulberry Connection │SWMP REPORT
OWNER/PERMITTEE CERTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is to the best
of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fine and imprisonment for knowing violations.
Site Developer’s Authorized Agent:Date:
OPERATOR/PERMITTEE CERTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is to the best
of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fine and imprisonment for knowing violations.
Site Developer’s Authorized Agent:Date:
Mulberry Connection│SWMP REPORT 8
SUBCONTRACTOR CERTIFICATION
SUBCONTRACTOR CERTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is to the best
of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fine and imprisonment for knowing violations.
Subcontractor’s Authorized Agent:Date:
SUBCONTRACTOR CERTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is to the best
of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fine and imprisonment for knowing violations.
Subcontractor’s Authorized Agent:Date:
SUBCONTRACTOR CERTIFICATION
I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the information submitted is to the best
of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fine and imprisonment for knowing violations.
Subcontractor’s Authorized Agent:Date:
Note: Additional Subcontractor Certifications shall be completed as necessary.
9 Mulberry Connection │SWMP REPORT
PROJECT DESCRIPTION AND NATURE OF CONSTRUCTION
SITE LOCATION
The proposed Mulberry Connection Project is located within the Northeast Quarter of Section 9, Township
7 North, Range 68 West of the Sixth Principal Meridian, City of Fort Collins, County of Larimer, Colorado.
The site is on the parcel of land #8709000042, at approximate latitude and longitude (decimal degrees):
40.591728, 105.004278. The site is bound by:
· North: Existing Farmland
· East: Interstate 25 (“I-25”) Frontage Road
· South: Redman Drive
· West: Existing Farmland
A vicinity map is provided below.
Mulberry Connection│SWMP REPORT 10
EXISTING SITE CONDITIONS
The site is approximately 12.94 acres of existing farmland, with an approximate disturbed area of 14.53
acres.
SOILS
The soil on the site is primarily Nunn loam and Garrett loam, which have the following characteristics, per
the NRCS Web Soil Survey (included in Appendix A):
Soil Characteristic Nunn Loam1 Garrett Loam1
Soil Type2 Clay Loam Clay Loam
Typical Particle Size (Percent
Passing No. 200)2 18% - 98%
Dry Density2 102.0 – 119.9 PCF
Permeability1 Well Drained Well Drained
Hydrologic Soul Group1 C B
Soil Structure2 Moist, stiff, sandy lean clay/fat clay
Soil Erodibility (K-Factor)1 0.32 0.32
Soil Texture2 Moist, stiff, sandy lean clay/fat clay
Soil Depth2 2 to 9 feet below ground surface
1. Data from the NRCS Web Soil Survey report.
2. Data from Geotechnical Evaluation performed by Ninyo & Moore
According to the Geotechnical Evaluation performed by Ninyo & Moore on July 2, 2019 (included in
Appendix A), alluvium was encountered in each boring beneath the loam and extended to the boring’s
termination, approximately 20.5 feet below ground surface.
EXISTING DRAINAGES AND DISCHARGE POINTS
The Site is located within the Boxelder Creek and Cooper Slough Basins. The Master Plan for these basins
is currently being updated, according to the City of Fort Collins website. According to the Problem
Identification Map, the Site is not within a high or moderate risk floodplain. The Flooding Solutions Map
11 Mulberry Connection │SWMP REPORT
indicates that upgrades to pipes and open channels are recommended south of the Site along E. Mulberry
Street. No flooding or water quality improvements are recommended within the vicinity of the Site.
The site is located within City of Fort Collins Federal Emergency Management Agency (FEMA) Flood
Insurance Rate Map Number 08069C0984H and the property being developed is designated as an area
outside of the 100-year floodplain. The updated FEMA maps is included in Appendix A.
The existing Site is relativity flat with slopes ranging from 0.5% to 3%. There are currently no existing on-
site water quality or detention improvements. The majority of the site currently slopes to the southwest,
conveying water into an existing roadside ditch adjacent to Redman Drive, which discharges into Cooper
Slough approximately 600 feet west of the Site. The property directly north of the Site is collected by an
existing drainage ditch along the northern property line, routing all discharges around the Site, west to
Cooper Slough. I-25 Frontage Road is adjacent to the Site to the east. The width of the Frontage Road
drains west into an existing drainage ditch adjacent to the Site in the existing condition. Flows in this existing
ditch are routed south.
PATHWAY TO NEAREST STATE WATER
The existing discharge point for this site is the existing roadside swale along the southern property line,
which routes flows west to Cooper Slough. From the site, flows are within this existing drainage swale for
approximately 300 linear feet before reach Cooper Slough.
EXISTING VEGETATION
The existing site is utilized as agricultural land with ground cover primarily made up of crop. There is no
existing impervious cover within the site property boundary. Based on field visual inspections, it is estimated
the existing vegetative ground cover is 70-80%.
GROUNDWATER
According to the Geotechnical Evaluation performed by Ninyo & Moore on July 2, 2019, groundwater was
encountered at depths ranging between approximately 8.5 to 12 feet below ground surface, included in
Appendix A. There is no known groundwater contamination.
SOIL EROSION POTENTIAL
The soil erodibility K-Factor ranges from 0.02 to 0.69, with higher values indicating higher potential for
erosion. The soils on this site have a K-Factor of 0.32, which indicates moderate potential for soil erosion.
Additionally, both the NRCS Soil Report and Geotechnical Evaluation indicate that the existing soils have
high infiltration potential and therefore moderate erosion can be expected.
PROPOSED CONSTRUCTION ACTIVITIES
The proposed site includes two industrial buildings with associated parking and landscape improvements.
Utilities will be installed in support if the new buildings, along with appropriate stormwater facilities, Water
quality to mitigate and treat stormwater runoff from the site is provided in two on-site rain gardens, one
underground water quality facility, and one detention pond. Concurrently, the Project also includes
expansion of the I-25 Frontage Road east of the site property.
Site and disturbance areas anticipated for the project construction activities are indicted below:
Mulberry Connection│SWMP REPORT 12
· Site Property: ±12.94 Acres
· Limits of Construction (including off-site): ±14.53 Acres
· Disturbance Area: ±14.53 Acres
These areas are as indicated on the Erosion Control Plan included in Appendix B.
POSSIBLE ENVIRONMENTAL IMPACTS
Impacts to downstream Cooper Slough may be possible with the construction of this site. This location
could also impact the following threatened and endangered species, as listed by the U.S. Fish & Wildlife
Service’s IPaC resource list (included in Appendix A):
· Canada Lynx (threatened)
· Preble’s Meadow Jumping Mouse (threatened)
· Least Tern (endangered)
· Mexican Spotted Owl (threatened)
· Piping Plover (threatened)
· Whooping Crane (endangered)
· Greenback Cutthroat Trout (threatened)
· Pallid Sturgeon (endangered)
· Ute Ladies’-tresses (threatened)
· Western Prairie Fringed Orchid (threatened)
STATE AND FEDERAL PERMITS
The following table identifies possible State and Federal permits related to development and the
applicability to this project.
Permit Applicability To This Project
State CDPHE Stormwater Permit associated with
Construction Activities
Will be required
US Army Corps of Engineers 404 Permits for
Stream Crossing
Not Applicable
State CDPHE Construction Dewatering Permits Not anticipated, but may be required depending
on groundwater conditions at the time of
construction
State CDPHE Air Pollution Emission Notification
(APEN) Permit
Not Applicable
NEPA Regulations Not Applicable
13 Mulberry Connection │SWMP REPORT
State CDPHE 401 Water Quality Certifications
Stream Crossing
Not Applicable
State Division of Water Resources Dewatering
and other water use permits
Not anticipated, but may be required depending
on groundwater conditions at the time of
construction
PROJECT CONTACTS
SWMP PREPARER
Company:Kimley-Horn and Associates, Inc.
Contact:Dan Skeehan, P.E.
Address:4582 South Ulster Street – Suite 1500
Denver, CO 80237
Phone:303.228.2318
Email:dan.skeehan@kimley-horn.com
OWNER/PERMITTEE
Company:Armie Management, LLC.
Contact:Josh Heiney
Address:1855 South Pearl Street, Suite 20
Denver, CO 80210
Phone:720.414.5210
Email:jheiney@thejredgroup.com
OPERATOR/PERMITTEE
Company:Alcorn Construction, Inc.
Contact:
Address:12477 W Cedar Drive
Lakewood, CO 80228
Phone:
Email:
Mulberry Connection│SWMP REPORT 14
POTENTIAL POLLUTANT SOURCES
The below table identifies whether or not the most commonly identified sources of pollutants will be present
on this construction site. The following sections provide descriptions of the pollutant sources likely to be
present at this site and proposed control measures to mitigate the potential pollution. Logs for the
identification of pollutant sources are included in Appendix D for reference and use.
Pollutant Source Anticipated to be
Present on This Project
All disturbed and stored soils Yes
Vehicle tacking of sediments Yes
Management of contaminated soils No
Loading and unloading operations Yes
Outdoor storage of construction site material, building materials, fertilizers,
and chemicals
Yes
Bulk storage of materials Yes
Vehicle and equipment maintenance and fueling No
Significant dust or particulate generating processes Yes
Routine maintenance activities involving fertilizers, pesticides, detergents,
fuels, solvents, and oils
No
On-site waste management practices Yes
Concrete truck/equipment washing, including the concrete truck chute and
associated fixtures and equipment
Yes
Dedicated asphalt and concrete batch plants No
Non-industrial waste sources such as worker trash and portable toilets Yes
Saw cutting and grading Yes
15 Mulberry Connection │SWMP REPORT
Other non-stormwater discharges including construction dewatering not
covered under the Construction Dewatering Discharges general permit
No
Other areas of operations where spills can occur No
DISTURBED AND STORED SOILS
Approximately 100% percent of this site (on-site and off-site) will be disturbed with the Construction
Activities. Once soils have been disturbed they do not retain the same compaction as in their native state,
therefore surface runoff can cause more soil erosion than was historically observed. Based upon the site
design, this site will not disturb all areas of construction until it is required to as part of the Construction
Activities (phasing). Once exposed those areas of exposed soils will be kept in a roughened condition
(surface roughening). In the event that these erosion control practices do not keep sediment on site, a
structural barrier (silt fence) will be used and is called out for on the perimeter. If soil manages to migrate
from the disturbed areas onto the hard surfaces it will be swept or scraped (street sweeping) to prevent
the migration of sediment. In case that sediment is washed away too quickly the curb inlets will need
protection (rock sock style inlet protection).
Stockpiles in the same respect do not retain the same compaction and are more susceptible to soil
erosion. Stockpiles on this site shall be placed in or near the center of the site and away from any
drainage swales to not require perimeter run off controls (Materials/Site Management Control). The
Erosion Control Plans in Appendix B show the location of stockpiles near the northwest corner of the site.
The stockpile will be kept loose, not compacted, and watered as needed to prevent dust issues (site
watering). The stockpile will be monitored for signs of erosion displacement and sediment accumulation
and if conditions warrant it, the stockpile will be structurally covered or if it is going to sit a long while will
be reseeded (temporary seeding).
VEHICLE TRACKING OF SEDIMENTS
Vehicle tracking of sediment may occur throughout the construction process and along all areas where
the pavement meets the disturbed dirt. This occurs most often after any melt off or rain conditions when
mud collects on vehicles tires and is tracked out onto the road consequently leaving site. This increases
the possibility of sediment discharging to the storm system. To prevent tracking, construction fence (site
barrier/site management control) will be used on the two accessible sides of the site to limit the access by
the Contractor and their Subs to only two construction entrances (vehicle tracking pads to be installed).
There will be a gate at the entrances that will be closed before Contractors come on site during the
muddy days (site management control) and will only be opened to let larger deliveries drop off, otherwise
Subcontractor parking will be kept to the street. All Contractors have signed contracts that will have them
clean the streets if they are found to be tracking dirt onto the street (site management control). The
tracking pad will be monitored visually every day and if track-out becomes a significant problem a larger
or more robust tracking pad may be installed. Otherwise, all track-out that reaches the street will be
scraped and swept (street sweeping). Secondary controls at the closest affected drainage structures will
have protection (inlet protection) to capture sediment not swept up in a timely manner.
LOADING AND UNLOADING OPERATIONS
During this project there will be a diverse amount of loading and unloading going on. There foundation
workers will have to deliver forms to the site and deliver premixed concrete. Building materials will have to
Mulberry Connection│SWMP REPORT 16
be staged around the site and Landscapers will have to pile the materials on site to complete the
landscape work. Though the loading and unloading vehicles will be contributing to the track out of
materials, depending on the material being delivered to the site they may have a significant spill potential.
In addition to the vehicle tracking of sediments section of this report, (VTC, Sweeping, etc.) Contractors
may be required to park their vehicles on the adjacent roadways (site management control). Where the
project is mostly dirt and not stable semi-trailers will be directed to pull alongside the project and site
loaders will be used to off load the trailers. Where the trailers must access the site an attempt will be
made to keep the vehicle on the VTC or other stabilized storage areas. Where the site parking lot and
private drives have been installed materials will be placed in piles along the hardscape where the use of
site forklifts will be more heavily used. When loading and unloading is occurring, depending on the
materials, there may be an increased problem of containers being dropped, punctured, or broken. These
off-loading activities will be done under roofs or awnings where possible, locating away from storm drains
and will have nearby spill kits accessible. Spills on site will be addressed using spill prevention and
response procedures.
OUTDOOR STORAGE OF CONSTRUCTION SITE MATERIAL, BUILDING
MATERIALS, FERTILIZERS, AND CHEMICALS
It is anticipated that inert material like wood, shingles, tiles, siding insulation and stone will be stored on
site and outside in the elements. It is also anticipated that materials that do not weather well (cement,
mortar, etc.) will also be located outside. Chemicals are not anticipated to be left outside. As the inert
materials have a lower potential to leave the site they will be monitored during inspection to make sure
they are not being impacted by the exposure to the elements (site management control). The materials
that will need added attention are the cements and mortars as they quickly mix with water and cause
pollution issues. These materials when not stored inside will be placed on pallets to get above potential
surface runoff and covered with tarps or plastic to prevent mixing with stormwater (materials management
control). Very small quantities of chemical are needed to contaminate stormwater so the fertilizers,
paints, form oils, petroleum products, and other typical chemicals, will be stored in the construction
connex box, trailers, vehicles, or the like out of contact with precipitation (materials management control).
If not stored in a location as described, secondary containment will be required.
BULK STORAGE OF MATERIALS
Any bulk storage of materials will be stored inside if possible (site management). If stored outside, bulk
storage will require secondary containment. Any materials stored that could rupture and cause a spill
shall be stored in an area that allows the adequate room from spread without impacting drainage
infrastructure (materials management).
SIGNIFICANT DUST OR PARTICULATE GENERATING PROCESSES
This project will result in earth moving activities, street sweeping, and track-out and carry out, bulk
materials transport, and saw cutting. As these activities will result in offsite transport of atmospheric
pollution; reasonable precautions shall be taken. The project will follow all required “BMPs” articulated in
the Fugitive Dust Manual and a least one additional BMP included during each of the identified activities
in accordance with City Ordinance No. 044,2016. Also a copy of the Dust Control Manual will be kept in
the trailer during construction for reference. Such activities will include but not limited to watering the site,
covering trucks, slower site speeds, and vehicle tracking mentioned above.
17 Mulberry Connection │SWMP REPORT
ON-SITE WASTE MANAGEMENT PRACTICES
All large and heavy weighted waste piles (concrete chunks, excavated pipes, etc.) will be kept in a neat
grouped pile until the material is to be disposed of properly. These piles will only be stored a short
duration 5-10 days and will be kept 50 feet from any drainage course or inlet (Administrative Control). All
dry wastes will be maintained through dumpsters and monthly hauler removal (hauler will be notified if
dumpster becomes full and hauled off as needed). Where available by the hauling company the dumpster
will be covered. If not practical or available by the haul company, an increased removal schedule will be
followed and the “Max fill line” on the dumpster will be strictly followed. Corners of the dumpsters will be
monitored for “Dumpster Juice” leaking into the soil in dry conditions and rain/melt off conditions looking
for it mixing with the runoff. Dumpsters, like the waste piles, will be located at least 50 feet from any
drainage course or inlet. Workers will be sent around at the end of the day to collect trash to prevent
trash being left out overnight. No construction debris (including broken concrete) will be buried on site.
CONCRETE TRUCK/EQUIPMENT WASHING, INCLUDING THE CONCRETE
TRUCK CHUTE AND ASSOCIATED FIXTURES AND EQUIPMENT
Concrete will be a portion of this project. It is anticipated that it will be used with the joints around the
manholes, pour in place inlets, curb and gutter installation, sidewalks, pavement, building walls, and
foundations. Pre mixed concrete trucks will be used in this process and will be delivered to the site and
when pouring the foundation a pump truck will be used all of which will need to be maintained through the
washing of their chutes and pump arms to prevent the concrete from hardening and ruining the
equipment. This concrete wash water has a high alkaline content which is hazardous material to
terrestrial and aquatic wildlife. A section of dirt near the entrance will be excavated and compacted
around the sides formed to retain the concrete wash water on site (as an acceptable practice by the
State) so long as the wash water is kept in the washout (concrete washout). There will be a rock pad for
the truck to park on while washing as to prevent tracking from this washout (VTC). Later in the project
after the parking lots curb and gutter has been poured the use of a mobile washout facility will be used on
site in a similar location and after the ground has been leveled (concrete washout – mobile). The
Contractor (including all masonry and concrete tradesmen) shall clean out equipment within the washout
area so that the runoff is not allowed to leave the washout. The only exception would be for them to wash
in the next day’s pour location. All concrete workers will be made aware of the where they are to wash
(site management controls & education). If there is a significant amount of spillage when the transfer from
concrete truck to pump truck occurs, a tarp or other ground cloth should be used to collect spillage
(ground cover control).
NON-INDUSTRIAL WASTE SOURCES SUCH AS WORKER TRASH AND
PORTABLE TOILETS
Since facilities are not located nearby for workers to use, trash and sanitary facilities will be required on
the site. Worker trash will be comingled with the industrial trash and will follow the same controls with the
caveat that a trashcan will be located near the entrance of the site as the Contractor will need to dump
their trash from lunch, etc. and this will be emptied weekly or more frequently, if needed. If tipped over
and when being cleaned, portable toilet facilities become a potential discharge if not cleaned up. If human
waste is spilled, it will need to be treated as a biological hazard of untreated sewage and will need to be
cleaned up in accordance with Larimer County Health Department Guidance. The toilets will be staked in
a way to prevent tipping on a dirt surface and located at least 50 feet from a drainage course or inlet. If
the site cannot accommodate a portable toilet on dirt, a containment pan or other secondary containment
Mulberry Connection│SWMP REPORT 18
will be provided. They will also be anchored prevent from tipping. All materials shall be properly disposed
of in accordance with the law.
SAW CUTTING AND GRADING
The trench work will require cutting into Redman Drive and the I-25 Frontage Road. This project will need
the use of hardened saws. These saws generate a significant amount of dust. Watering the cutting
surface to prevent airborne particulates (BMP in the City’s Fugitive Dust Manual) is required. The cutting
slurry has a high content of fine particulates (Silica Dust, Metals, etc.) that is not allowed to discharge as
runoff from the site. To prevent slurry from discharging offsite, Contractors will use the minimum amount
of water needed to prevent dust and blades from overheating (site management control). Cutting slurry
will be collected via vacuum or allowed to dry out and be scraped and swept up after the cutting has
finished (saw cutting).
GROUNDWATER DEWATERING (AS APPLICABLE)
Based upon the geotechnical data, ground water levels indicate that groundwater dewatering may be
required during some of the deeper excavations. Groundwater has in most excavations mixed with the
dirt and as they are pumped they will add an increased velocity coming out of the out flow end
contributing to erosion and speeding the transport of the suspended sediment particles. Also, construction
dewatering activities must be identified in the Erosion Control Report if they are to be infiltrated on site. If
the material is anticipated to be pumped to a stormwater conveyance the proper Construction Dewatering
Permit must be pulled from the State of Colorado. If pumping activities are to occur on the site, the use of
rock packs on the intake end of the pump will be used and a silt bag will be used on the outflow end of the
pump to reduce the silt and sediment from leaving the activity (dewatering Control Measure). If this will be
under a Dewatering Permit water samples will be collected in accordance with that permit.
CONTROL MEASURE DESCRIPTIONS AND INSTALLATION/REMOVAL
SEQUENCE
The operator shall utilize the following general construction practices which are required throughout the
project at locations shown on the SWMP or as dictated by construction activities.
· Materials handling and spill prevention
· Waste management and disposal
· Hazardous material storage and containment area
· Vehicle maintenance fueling and storage
· Solid waste containment facility
· Sanitary waste facility
· Street Sweeping (SS)
· SWMP Information Sign (S)
These practices shall remain active and operational throughout the duration of construction and be
identified on the SWMP. Due to any phasing required for the Project, it is understood that these control
measures may be relocated as needed to facilitate construction operations. The Operator shall locate and
identify the original and current location of these control measures on the SWMP throughout the
construction of the Project.
General construction sequencing and activities associated with this Project consist of the following:
19 Mulberry Connection │SWMP REPORT
Initial Phase
1. Prepare and submit the City of Fort Collins Excavation Permit and the CDPHE Construction
Stormwater Discharge Permit as required. A copy of the permit(s) shall be provided to the Site
Developer upon receipt from the City/CDPHE.
2. Install SWMP Information Sign (S) in accordance with applicable City, State, and Site Developer
requirements.
3. Install Vehicle Tracking Control (VTC).
4. Prepare Stabilized Staging Area (SSA). Contractor shall coordinate location with the Overall
Developer and note the actual size and location of this area.
5. Install and denote on the plan any of the following areas: trailer, parking, lay down, porta-potty,
wheel wash, concrete washout, mason's area, fuel and material storage containers, solid waste
containers, etc.
6. Install perimeter controls including Silt Fence (SF) and Rock Sock Perimeter Control (RS) around
limits as shown on plan. Ensure that the Limits of Construction (LOC) are defined as necessary or
known by all parties which will be responsible for construction on the Site. Construction Fence
(CF) shall also be installed and modified, if applicable, on the plan. Limits of Construction may be
located outside of this construction fence.
7. Install Inlet Protection (IP) at the existing culvert inlet, south of the Site.
8. Upon completion of the initial control measure installation the Operator shall schedule a Pre-
Construction Meeting with the City and Site Developer to confirm control measures installed are
adequate prior to proceeding with additional land disturbing activities.
Interim/Final Phase
9. Install Concrete Washout Area (CWA) prior to construction of concrete improvements.
10. Install utilities, storm sewers, curb and gutters.
11. Install Inlet Protection (IP) at each proposed inlet.
12. Begin fine grading the Site. Stockpile materials in accordance with the Soil Stockpile Management
(SP) control measure. Permanently stabilize areas to be vegetated as they are brought to final
grade.
13. Start construction of building pad and structures.
14. Grade and install Rain Gardens and Detention Pond, ensuring no compaction of existing soils
within these areas.
15. Install appropriate Inlet Protection and Outlet Protection at Rain Garden and Detention Pond
infrastructure.
16. Complete grading and installation of Permanent Stabilization (PS) over all areas in accordance with
approved Landscape Plans.
17. Remove remaining control measures once Permanent Stabilization has been achieved and
accepted by City Inspector. Repair and stabilize areas disturbed through control measure removal.
18. Notify the Site Developer of intent to file the Notice of Inactivation with the City/CDPHE and receive
Site Developer acceptance to proceed with stormwater management close-out.
19. Notify the City/CDPHE of the intent to file the Notice of Inactivation and receive City/CDPHE
acceptance prior to proceeding with filing the Notice of Inactivation.
20. Proceed with filing the Notice of Inactivation.
21. Provide the Site Developer with a copy of all stormwater documentation (permits, inspection
reports, logs, etc.) upon completion of project stormwater Notice of Inactivation.
Mulberry Connection│SWMP REPORT 20
STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL
Structural control measures shall be implemented onsite to minimize erosion and sediment transport.
Recommended control measures based upon a limited site review may be seen within the Erosion Control
Plan included in the appendices of this report. Additional control measures shall be implemented by the
Qualified Stormwater Manager if necessary to prevent sediment laden runoff from leaving the project site.
The SWMP and Erosion Control Plan shall be updated to reflect any changes or revisions enacted in the
field. Details of the control measures proposed for the Site are included in Appendix B.
NON-STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL
Non-Structural control measures shall be implemented onsite to minimize erosion and sediment transport.
Recommended control measures based upon a limited site review may be seen within the Erosion Control
Plan included in the appendices of this report. Additional control measures shall be implemented by the
Qualified Stormwater Manager if necessary to prevent sediment laden runoff from leaving the project site.
The SWMP and Erosion Control Plan shall be updated to reflect any changes or revisions enacted in the
field. Details of the control measures proposed for the Site are included in Appendix B.
PHASED CONTROL MEASURE IMPLEMENTATION
Since the Project will not require any major demolition, construction of the identified improvements will take
place under two phases of construction as identified within the construction sequencing included within this
report.
A Land Disturbance, Control Measure Installation, and Stabilization Log is provided in Appendix D and
shall be filled out accordingly during Control Measure implementation.
MATERIALS HANDLING AND SPILL PREVENTION
Any hazardous or potentially hazardous material that is brought onto the construction site shall be handled
properly in order to reduce the potential for stormwater pollution. In an effort to minimize the potential for a
spill of petroleum product or hazardous materials to come in contact with stormwater, the following steps
shall be implemented:
· Material Safety Data Sheets (MSDS) information shall be kept on site for any and all applicable
materials.
· All materials with hazardous properties (such as pesticides, petroleum products, fertilizers,
detergents, construction chemicals, acids, paints, paint solvents, additives for soil stabilization,
concrete, curing compounds and additives, etc.) shall be stored in a secure location, under cover
and in appropriate, tightly sealed containers when not in use.
· The minimum practical quantity of all such materials shall be kept on the job site and scheduled for
delivery as close to time of use as practical.
· A spill control and containment kit shall be provided on the construction site and location(s) shown
on the Erosion Control Plan.
· All of the product in a container shall be used before the container is disposed of. All such
containers shall be triple rinsed, with water prior to disposal. The rinse water used in these
containers shall be disposed of in a manner in compliance with State and Federal regulations and
shall not be allowed to mix with stormwater discharges.
· All products shall be stored in and used from the original container with the original product label
and used in strict compliance with the instructions on the product label.
21 Mulberry Connection │SWMP REPORT
· The disposal of excess or used products shall be in strict compliance with instructions on the
product label.
If utilized, temporary onsite fuel tanks for construction vehicles shall meet all state and federal regulations.
Tanks shall have approved spill containment with the capacity required by the applicable regulations. From
NFPA 30: All tanks shall be provided with secondary containment (i.e. containment external to and separate
from primary containment). Secondary containment shall be constructed of materials of sufficient thickness,
density and composition so as not to be structurally weakened as a result of contact with the fuel stored
and capable of containing discharged fuel for a period of time equal to or longer than the maximum
anticipated time sufficient to allow recovery of discharged fuel. The tanks shall be in sound condition free
of rust or other damage which might compromise containment. Fuel storage areas shall meet all
Environmental Protection Agency (EPA), OSHA and other regulatory requirements for signage, fire
extinguisher, etc. Hoses, valves, fittings, caps, filler nozzles and associated hardware shall be maintained
in proper working condition at all times. The location of fuel tanks shall be shown on the Erosion Control
Plan and shall be located to minimize exposure to weather and surface water drainage features.
The Operator shall develop and implement a Materials Handling and Spill Prevention Plan (MHSPP) in
accordance with the EPA and State of Colorado requirements. In the event of an accidental spill, immediate
action shall be undertaken by the Operator to contain and remove the spilled material. All hazardous
materials, including contaminated soil, shall be disposed of by the Operator in the manner specified by
federal, state and local regulations and by the manufacturer of such products. As soon as possible, the
spill shall be reported to the appropriate agencies. As required under the provisions of the Clean Water
Act, any spill or discharge entering waters of the United States shall be properly reported. The Operator
shall prepare a written record of any spill and associated clean-up activities of petroleum products or
hazardous materials in excess of 1 gallon or reportable quantities, whichever is less.
Any spills of petroleum products or hazardous materials in excess of Reportable Quantities as defined by
EPA or the state or local agency regulations, shall be immediately reported to the Colorado Department of
Public Health and Environment spill reporting lines.
· CDPHE Environmental Release and Incident Reporting Line (877) 518-5608.
For reference, a bulletin on Environmental Spill Reporting published by the CDPHE, has been included in
Appendix E of this report.
VEHICLE TRACKING AND DUST CONTROL
Vehicle Tracking Control Measures (structural and non-structural) shall be implemented in order to control
potential sediment discharges from vehicle tracking. Practices shall be implemented for all areas of
potential vehicle tracking which include, but are not limited to reduced site access and utilization of
designated haul routes.
Areas of soil that are denuded of vegetation and have little protection from particles being picked up and
carried by wind should be protected with a temporary cover or kept under control with water or other soil
adhering products to limit wind transported particles exiting the site perimeter.
Mulberry Connection│SWMP REPORT 22
WASTE MANAGEMENT AND DISPOSAL
An effective first step towards preventing pollution in stormwater from work sites involves using a common
sense approach to improve the facility’s basic housekeeping methods. Poor housekeeping practices result
in increased waste and potential for stormwater contamination.
No solid materials are allowed to be discharged from the site with stormwater. All solid waste, including
disposable materials incidental to the construction activities, must be collected and placed in containers.
Secure covers for the containers shall be provided at all times to meet state and local requirements. The
location of solid waste receptacles shall be identified on the Erosion Control Plan by the Operator.
Concrete waste is anticipated with this project; and therefore, a dedicated concrete washout is required.
The Qualified Stormwater Manager shall take appropriate containment and treatment measures and
document as necessary.
GROUNDWATER AND STORMWATER DEWATERING
Except as noted below, all discharges covered by this permit shall be composed entirely of stormwater
associated with construction activity.
· Emergency Fire Fighting Activities
· Uncontaminated Spring Water
· Landscape Irrigation Return Flow
Groundwater dewatering is not anticipated. If encountered, the operator shall file for appropriate permits
with the CDPHE.
MAINTENANCE AND INSPECTION REQUIREMENTS
INSPECTION SCHEDULE REQUIREMENTS
A thorough inspection of the stormwater management system shall be performed and documented at least
once every 7 calendar days, or once every 14 days, with post-storm event inspections conducted within 24
hours after the end of any precipitation or snowmelt. If more frequent inspections are required to ensure
that control measures are properly maintained and operated, the inspection schedule shall be modified to
meet this need.
INSPECTION PROCEDURES
The inspection shall include observations of:
· The Construction Site Perimeter and Discharge Points;
· All Disturbed Areas;
· Areas Used for Material / Waste Storage That are Exposed to Precipitation;
· Other Areas Determined to Have a Significant Potential for Stormwater Pollution;
· Erosion and Sediment Control Measures Identified in the SWMP; and
· Any Other Structural Control Measures That May Require Maintenance.
23 Mulberry Connection │SWMP REPORT
The inspection must determine if there is evidence of, or the potential for, pollutants entering the drainage
system. Control measures should be reviewed to determine if they still meet the design intent and
operational criteria in the SWMP and if they continue to adequately control pollutants at the site. Any control
measures not operating in accordance with the SWMP must be addressed as soon as possible,
immediately in most cases, to minimize the discharge of pollutants and the SWMP must be updated and
inspections must be documented.
Examples of specific items to evaluate during site inspections are listed below. This list is not intended to
be comprehensive. During each inspection, the inspector shall evaluate overall pollutant control system
performance as well as particular details of individual system components. Additional factors should be
considered as appropriate to the circumstances.
· Vehicle Tracking Control - Locations where vehicles enter and exit the site shall be inspected for
evidence of offsite sediment tracking. Exits shall be maintained as necessary to prevent the release
of sediment from vehicles leaving the site. Any sediment deposited on the adjacent roadway shall
be removed as necessary throughout the day or at the end of every day and disposed of in an
appropriate manner. Sediment shall not be washed into storm sewer systems.
· Erosion Control Devices - Rolled erosion control products (nets, blankets, turf reinforcement mats)
and marginally vegetated areas (areas not meeting required vegetative densities for final
stabilization) must be inspected frequently. Rilling, rutting and other signs of erosion indicate the
erosion control device is not functioning properly and additional erosion control devices are
warranted.
· Sediment Control Devices - Sediment barriers (silt fence, sediment control logs, etc.), traps and
basins must be inspected and they must be cleaned out at such time as their original capacity has
been reduced by 50 percent. All material excavated from behind sediment barriers or in traps and
basins shall be incorporated into onsite soils or spread out on an upland portion of the site and
stabilized. To minimize the potential for sediment releases from the Project, site perimeter control
devices shall be inspected with consideration given to changing up-gradient conditions.
· Material Storage Areas - Material storage areas should be located to minimize exposure to weather.
Inspections shall evaluate disturbed areas and areas used for storing materials that are exposed
to rainfall for evidence of, or the potential for, pollutants entering the drainage system or discharging
from the site. If necessary, the materials must be covered or original covers must be repaired or
supplemented. Also, protective berms must be constructed, if needed, in order to contain runoff
from material storage areas. All state and local regulations pertaining to material storage areas
shall be adhered to.
· Vegetation - Seed/Sod shall be free of weedy species and appropriate for site soils and regional
climate. Seeding, sodding, tacking, and mulching shall be completed, in accordance with the
requirements outlined within the Project Manual and locations identified within the plans,
immediately after topsoil is applied and final grade is reached. Grassed areas shall be inspected
to confirm that a healthy stand of grass is maintained. Rip-rap, mulch, gravel, decomposed granite
or other equivalent permanent stabilization measures may be employed in lieu of vegetation based
on site-specific conditions and Site Developer approval.
· Discharge Points - All discharge points must be inspected to determine whether erosion and
sediment control measures are effective in preventing discharge of sediment from the site or
impacts to receiving waters.
Mulberry Connection│SWMP REPORT 24
All necessary maintenance and repair shall be completed immediately. The inspection reports must be
completed after each inspection. An important aspect of the inspection report is the description of additional
measures that need to be taken to enhance plan effectiveness. The inspection report must identify whether
the site was in compliance with the SWMP at the time of inspection and specifically identify all incidents of
non-compliance.
The Qualified Stormwater Manager shall ensure that, at a minimum, the following is recorded for each
inspection and kept onsite for reference:
· Inspection Date
· Name(s) and Title(s) of Inspection Personnel
· Location(s) of Discharges of Sediment and Other Pollutants from the Site
· Location(s) of control measures Requiring Maintenance
· Location(s) of Failed control measures
· Location(s) of Additional Required control measures
· Deviations from the Minimum Inspections Schedule (If Applicable)
· Description of Corrective Actions
· Certification of SWMP Compliance after adequate corrective action(s) taken, or where a report
does not identify any incidents requiring corrective action, this certification shall be made by the
inspector indicating compliance with the permit
The use and maintenance of log books, photographs, field notebooks, drawings or maps should also be
included in the SWMP records when appropriate. Copies of the Inspection Form and Control Measure
Corrective Action Log have been included in Appendix D for reference and use.
CONTROL MEASURE MAINTENANCE / REPLACEMENT AND FAILED
CONOTROL MEASURESS
Site inspection procedures noted above must address maintenance of control measures that are found to
no longer function as needed and designed, as well as preventive measures to proactively ensure continued
operation.
The Qualified Stormwater Manager shall implement a preventative maintenance program to ensure that
control measure breakdowns and failures are handled proactively. Site inspections should uncover any
conditions which could result in the discharge of pollutants to storm sewers and surface waters and shall
be rectified. For example, sediment shall be removed from silt fences on a regular basis to prevent failure
of the control measure. Sediment shall be removed to an appropriate location so that it will not become an
additional pollutant source.
The inspection process must also include replacement of control measures when needed or the addition of
new control measures in order to adequately manage the pollutant sources at the site.
Any control measure deficiencies, replacement or additional control measures that may be required shall
be documented on the Erosion Control Plans and on the appropriate Inspection Form. If amendments to
the control measure are required, these amendments shall be documented on the Control Measure
Amendment Log included in Appendix K for reference and use.
25 Mulberry Connection │SWMP REPORT
FINAL VEGETATION AND STABILIZATION
In the natural condition, the site soil is stabilized by means of native vegetation. Therefore, the final
stabilization technique to be used at this project for stabilizing soils shall be to provide a protective cover of
native vegetation, gravel road base, and granular stabilization material. Seeding should be conducted after
final grade is achieved and soils are prepared to take advantage of soil moisture and seed germination.
The SWMP Administrator should evaluate the short and long-term forecasts prior to applying permanent
seed.
Final site stabilization is achieved when vegetative cover provides permanent stabilization with a density
greater than 70 percent of the pre-disturbance levels, or equivalent permanent, physical erosion
reduction methods have been employed over the entire area to be stabilized by vegetative cover. This area
is exclusive of areas that are covered with rock (crushed granite, gravel, etc.) or landscape mulch, paved
or have a building or other permanent structure on them.
Mulberry Connection│SWMP REPORT 26
APPENDIX
MULBERRY CONNECTION │SWMP REPORT
APPENDIX A – SITE SPECIFIC REPORTS
United States
Department of
Agriculture
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Larimer County
Area, ColoradoNatural
Resources
Conservation
Service
August 15, 2019
6
Custom Soil Resource Report
Soil Map
44932804493330449338044934304493480449353044935804493280449333044933804493430449348044935304493580499430 499480 499530 499580 499630 499680 499730 499780 499830 499880
499430 499480 499530 499580 499630 499680 499730 499780 499830 499880
40° 35' 35'' N 105° 0' 25'' W40° 35' 35'' N105° 0' 4'' W40° 35' 24'' N
105° 0' 25'' W40° 35' 24'' N
105° 0' 4'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 100 200 400 600
Feet
0 30 60 120 180
Meters
Map Scale: 1:2,260 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 13, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
7
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
40 Garrett loam, 0 to 1 percent
slopes
5.6 27.8%
53 Kim loam, 1 to 3 percent slopes 0.0 0.0%
63 Longmont clay, 0 to 3 percent
slopes
0.6 2.8%
73 Nunn clay loam, 0 to 1 percent
slopes
13.9 69.4%
76 Nunn clay loam, wet, 1 to 3
percent slopes
0.0 0.1%
Totals for Area of Interest 20.0 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
Custom Soil Resource Report
8
19
Custom Soil Resource Report
Map—Hydrologic Soil Group
44932804493330449338044934304493480449353044935804493280449333044933804493430449348044935304493580499430 499480 499530 499580 499630 499680 499730 499780 499830 499880
499430 499480 499530 499580 499630 499680 499730 499780 499830 499880
40° 35' 35'' N 105° 0' 25'' W40° 35' 35'' N105° 0' 4'' W40° 35' 24'' N
105° 0' 25'' W40° 35' 24'' N
105° 0' 4'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 100 200 400 600
Feet
0 30 60 120 180
Meters
Map Scale: 1:2,260 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 13, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
20
Table—Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
40 Garrett loam, 0 to 1
percent slopes
B 5.6 27.8%
53 Kim loam, 1 to 3 percent
slopes
B 0.0 0.0%
63 Longmont clay, 0 to 3
percent slopes
D 0.6 2.8%
73 Nunn clay loam, 0 to 1
percent slopes
C 13.9 69.4%
76 Nunn clay loam, wet, 1 to
3 percent slopes
C 0.0 0.1%
Totals for Area of Interest 20.0 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Custom Soil Resource Report
21
11/29/2020 IPaC: Explore Location
https://ecos.fws.gov/ipac/location/DXV52Z2H3VC23CWFJ7WNJ5AUKA/resources 1/13
IPaC resource list
This report is an automatically generated list of species and other resources such as critical habitat
(collectively referred to as trust resources) under the U.S. Fish and Wildlife Service's (USFWS)
jurisdiction that are known or expected to be on or near the project area referenced below. The list
may also include trust resources that occur outside of the project area, but that could potentially be
directly or indirectly a ected by activities in the project area. However, determining the likelihood
and extent of e ects a project may have on trust resources typically requires gathering additional
site-speci c (e.g., vegetation/species surveys) and project-speci c (e.g., magnitude and timing of
proposed activities) information.
Below is a summary of the project information you provided and contact information for the USFWS
o ce(s) with jurisdiction in the de ned project area. Please read the introduction to each section
that follows (Endangered Species, Migratory Birds, USFWS Facilities, and NWI Wetlands) for
additional information applicable to the trust resources addressed in that section.
Location
Larimer County, Colorado
Local o ce
Colorado Ecological Services Field O ce
(303) 236-4773
(303) 236-4005
MAILING ADDRESS
Denver Federal Center
P.O. Box 25486
Denver, CO 80225-0486
PHYSICAL ADDRESS
U.S. Fish & Wildlife ServiceIPaC
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134 Union Boulevard, Suite 670
Lakewood, CO 80228-1807
http://www.fws.gov/coloradoES
http://www.fws.gov/platteriver
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Endangered species
This resource list is for informational purposes only and does not constitute an analysis of
project level impacts.
The primary information used to generate this list is the known or expected range of each species.
Additional areas of in uence (AOI) for species are also considered. An AOI includes areas outside of
the species range if the species could be indirectly a ected by activities in that area (e.g., placing a
dam upstream of a sh population, even if that sh does not occur at the dam site, may indirectly
impact the species by reducing or eliminating water ow downstream). Because species can move,
and site conditions can change, the species on this list are not guaranteed to be found on or near
the project area. To fully determine any potential e ects to species, additional site-speci c and
project-speci c information is often required.
Section 7 of the Endangered Species Act requires Federal agencies to "request of the Secretary
information whether any species which is listed or proposed to be listed may be present in the area
of such proposed action" for any project that is conducted, permitted, funded, or licensed by any
Federal agency. A letter from the local o ce and a species list which ful lls this requirement can
only be obtained by requesting an o cial species list from either the Regulatory Review section in
IPaC (see directions below) or from the local eld o ce directly.
For project evaluations that require USFWS concurrence/review, please return to the IPaC website
and request an o cial species list by doing the following:
1. Draw the project location and click CONTINUE.
2. Click DEFINE PROJECT.
3. Log in (if directed to do so).
4. Provide a name and description for your project.
5. Click REQUEST SPECIES LIST.
Listed species and their critical habitats are managed by the Ecological Services Program of the U.S.
Fish and Wildlife Service (USFWS) and the sheries division of the National Oceanic and Atmospheric
Administration (NOAA Fisheries ).
Species and critical habitats under the sole responsibility of NOAA Fisheries are not shown on this
list. Please contact NOAA Fisheries for species under their jurisdiction.
1. Species listed under the Endangered Species Act are threatened or endangered; IPaC also shows
species that are candidates, or proposed, for listing. See the listing status page for more
information.
2. NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an o ce of the
National Oceanic and Atmospheric Administration within the Department of Commerce.
The following species are potentially a ected by activities in this location:
Mammals
1
2
NAME STATUS
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Birds
Fishes
Canada Lynx Lynx canadensis
There is nal critical habitat for this species. Your location is outside
the critical habitat.
https://ecos.fws.gov/ecp/species/3652
Threatened
Preble's Meadow Jumping Mouse Zapus hudsonius preblei
There is nal critical habitat for this species. Your location is outside
the critical habitat.
https://ecos.fws.gov/ecp/species/4090
Threatened
NAME STATUS
Least Tern Sterna antillarum
This species only needs to be considered if the following condition
applies:
Water-related activities/use in the N. Platte, S. Platte and Laramie
River Basins may a ect listed species in Nebraska.
No critical habitat has been designated for this species.
https://ecos.fws.gov/ecp/species/8505
Endangered
Mexican Spotted Owl Strix occidentalis lucida
There is nal critical habitat for this species. Your location is outside
the critical habitat.
https://ecos.fws.gov/ecp/species/8196
Threatened
Piping Plover Charadrius melodus
There is nal critical habitat for this species. Your location is outside
the critical habitat.
https://ecos.fws.gov/ecp/species/6039
Threatened
Whooping Crane Grus americana
This species only needs to be considered if the following condition
applies:
Water-related activities/use in the N. Platte, S. Platte and Laramie
River Basins may a ect listed species in Nebraska.
There is nal critical habitat for this species. Your location is outside
the critical habitat.
https://ecos.fws.gov/ecp/species/758
Endangered
NAME STATUS
Greenback Cutthroat Trout Oncorhynchus clarkii stomias
No critical habitat has been designated for this species.
https://ecos.fws.gov/ecp/species/2775
Threatened
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Flowering Plants
Critical habitats
Potential e ects to critical habitat(s) in this location must be analyzed along with the endangered
species themselves.
THERE ARE NO CRITICAL HABITATS AT THIS LOCATION.
Migratory birds
Pallid Sturgeon Scaphirhynchus albus
This species only needs to be considered if the following condition
applies:
Water-related activities/use in the N. Platte, S. Platte and Laramie
River Basins may a ect listed species in Nebraska.
No critical habitat has been designated for this species.
https://ecos.fws.gov/ecp/species/7162
Endangered
NAME STATUS
Ute Ladies'-tresses Spiranthes diluvialis
No critical habitat has been designated for this species.
https://ecos.fws.gov/ecp/species/2159
Threatened
Western Prairie Fringed Orchid Platanthera praeclara
This species only needs to be considered if the following condition
applies:
Water-related activities/use in the N. Platte, S. Platte and Laramie
River Basins may a ect listed species in Nebraska.
No critical habitat has been designated for this species.
https://ecos.fws.gov/ecp/species/1669
Threatened
Certain birds are protected under the Migratory Bird Treaty Act and the Bald and Golden Eagle
Protection Act .
Any person or organization who plans or conducts activities that may result in impacts to migratory
birds, eagles, and their habitats should follow appropriate regulations and consider implementing
appropriate conservation measures, as described below.
1. The Migratory Birds Treaty Act of 1918.
2. The Bald and Golden Eagle Protection Act of 1940.
Additional information can be found using the following links:
1
2
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The birds listed below are birds of particular concern either because they occur on the USFWS Birds
of Conservation Concern (BCC) list or warrant special attention in your project location. To learn
more about the levels of concern for birds on your list and how this list is generated, see the FAQ
below. This is not a list of every bird you may nd in this location, nor a guarantee that every bird on
this list will be found in your project area. To see exact locations of where birders and the general
public have sighted birds in and around your project area, visit the E-bird data mapping tool (Tip:
enter your location, desired date range and a species on your list). For projects that occur o the
Atlantic Coast, additional maps and models detailing the relative occurrence and abundance of bird
species on your list are available. Links to additional information about Atlantic Coast birds, and
other important information about your migratory bird list, including how to properly interpret and
use your migratory bird report, can be found below.
For guidance on when to schedule activities or implement avoidance and minimization measures to
reduce impacts to migratory birds on your list, click on the PROBABILITY OF PRESENCE SUMMARY at
the top of your list to see when these birds are most likely to be present and breeding in your
project area.
Birds of Conservation Concern http://www.fws.gov/birds/management/managed-species/
birds-of-conservation-concern.php
Measures for avoiding and minimizing impacts to birds
http://www.fws.gov/birds/management/project-assessment-tools-and-guidance/
conservation-measures.php
Nationwide conservation measures for birds
http://www.fws.gov/migratorybirds/pdf/management/nationwidestandardconservationmeasures.pdf
NAME BREEDING SEASON (IF A
BREEDING SEASON IS INDICATED
FOR A BIRD ON YOUR LIST, THE
BIRD MAY BREED IN YOUR
PROJECT AREA SOMETIME WITHIN
THE TIMEFRAME SPECIFIED,
WHICH IS A VERY LIBERAL
ESTIMATE OF THE DATES INSIDE
WHICH THE BIRD BREEDS
ACROSS ITS ENTIRE RANGE.
"BREEDS ELSEWHERE" INDICATES
THAT THE BIRD DOES NOT LIKELY
BREED IN YOUR PROJECT AREA.)
Bald Eagle Haliaeetus leucocephalus
This is not a Bird of Conservation Concern (BCC) in this area, but
warrants attention because of the Eagle Act or for potential
susceptibilities in o shore areas from certain types of development
or activities.
https://ecos.fws.gov/ecp/species/1626
Breeds Oct 15 to Jul 31
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Probability of Presence Summary
The graphs below provide our best understanding of when birds of concern are most likely to be
present in your project area. This information can be used to tailor and schedule your project
activities to avoid or minimize impacts to birds. Please make sure you read and understand the FAQ
“Proper Interpretation and Use of Your Migratory Bird Report” before using or attempting to
interpret this report.
Probability of Presence ()
Cassin's Sparrow Aimophila cassinii
This is a Bird of Conservation Concern (BCC) only in particular Bird
Conservation Regions (BCRs) in the continental USA
https://ecos.fws.gov/ecp/species/9512
Breeds Aug 1 to Oct 10
Chestnut-collared Longspur Calcarius ornatus
This is a Bird of Conservation Concern (BCC) throughout its range in
the continental USA and Alaska.
Breeds May 1 to Aug 10
Golden Eagle Aquila chrysaetos
This is a Bird of Conservation Concern (BCC) only in particular Bird
Conservation Regions (BCRs) in the continental USA
https://ecos.fws.gov/ecp/species/1680
Breeds Jan 1 to Aug 31
Lark Bunting Calamospiza melanocorys
This is a Bird of Conservation Concern (BCC) only in particular Bird
Conservation Regions (BCRs) in the continental USA
Breeds May 10 to Aug 15
Lesser Yellowlegs Tringa avipes
This is a Bird of Conservation Concern (BCC) throughout its range in
the continental USA and Alaska.
https://ecos.fws.gov/ecp/species/9679
Breeds elsewhere
Lewis's Woodpecker Melanerpes lewis
This is a Bird of Conservation Concern (BCC) throughout its range in
the continental USA and Alaska.
https://ecos.fws.gov/ecp/species/9408
Breeds Apr 20 to Sep 30
Willet Tringa semipalmata
This is a Bird of Conservation Concern (BCC) throughout its range in
the continental USA and Alaska.
Breeds Apr 20 to Aug 5
Willow Flycatcher Empidonax traillii
This is a Bird of Conservation Concern (BCC) only in particular Bird
Conservation Regions (BCRs) in the continental USA
https://ecos.fws.gov/ecp/species/3482
Breeds May 20 to Aug 31
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no data survey e ort breeding season probability of presence
Each green bar represents the bird's relative probability of presence in the 10km grid cell(s) your
project overlaps during a particular week of the year. (A year is represented as 12 4-week months.)
A taller bar indicates a higher probability of species presence. The survey e ort (see below) can be
used to establish a level of con dence in the presence score. One can have higher con dence in the
presence score if the corresponding survey e ort is also high.
How is the probability of presence score calculated? The calculation is done in three steps:
1. The probability of presence for each week is calculated as the number of survey events in the
week where the species was detected divided by the total number of survey events for that
week. For example, if in week 12 there were 20 survey events and the Spotted Towhee was
found in 5 of them, the probability of presence of the Spotted Towhee in week 12 is 0.25.
2. To properly present the pattern of presence across the year, the relative probability of presence
is calculated. This is the probability of presence divided by the maximum probability of presence
across all weeks. For example, imagine the probability of presence in week 20 for the Spotted
Towhee is 0.05, and that the probability of presence at week 12 (0.25) is the maximum of any
week of the year. The relative probability of presence on week 12 is 0.25/0.25 = 1; at week 20 it is
0.05/0.25 = 0.2.
3. The relative probability of presence calculated in the previous step undergoes a statistical
conversion so that all possible values fall between 0 and 10, inclusive. This is the probability of
presence score.
To see a bar's probability of presence score, simply hover your mouse cursor over the bar.
Breeding Season ()
Yellow bars denote a very liberal estimate of the time-frame inside which the bird breeds across its
entire range. If there are no yellow bars shown for a bird, it does not breed in your project area.
Survey E ort ()
Vertical black lines superimposed on probability of presence bars indicate the number of surveys
performed for that species in the 10km grid cell(s) your project area overlaps. The number of
surveys is expressed as a range, for example, 33 to 64 surveys.
To see a bar's survey e ort range, simply hover your mouse cursor over the bar.
No Data ()
A week is marked as having no data if there were no survey events for that week.
Survey Timeframe
Surveys from only the last 10 years are used in order to ensure delivery of currently relevant
information. The exception to this is areas o the Atlantic coast, where bird returns are based on all
years of available data, since data in these areas is currently much more sparse.
SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
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Bald Eagle
Non-BCC Vulnerable
(This is not a Bird of
Conservation
Concern (BCC) in this
area, but warrants
attention because of
the Eagle Act or for
potential
susceptibilities in
o shore areas from
certain types of
development or
activities.)
Cassin's Sparrow
BCC - BCR (This is a
Bird of Conservation
Concern (BCC) only in
particular Bird
Conservation Regions
(BCRs) in the
continental USA)
Chestnut-collared
Longspur
BCC Rangewide
(CON) (This is a Bird
of Conservation
Concern (BCC)
throughout its range
in the continental
USA and Alaska.)
Golden Eagle
BCC - BCR (This is a
Bird of Conservation
Concern (BCC) only in
particular Bird
Conservation Regions
(BCRs) in the
continental USA)
Lark Bunting
BCC - BCR (This is a
Bird of Conservation
Concern (BCC) only in
particular Bird
Conservation Regions
(BCRs) in the
continental USA)
Lesser Yellowlegs
BCC Rangewide
(CON) (This is a Bird
of Conservation
Concern (BCC)
throughout its range
in the continental
USA and Alaska.)
Lewis's
Woodpecker
BCC Rangewide
(CON) (This is a Bird
of Conservation
Concern (BCC)
throughout its range
in the continental
USA and Alaska.)
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Willet
BCC Rangewide
(CON) (This is a Bird
of Conservation
Concern (BCC)
throughout its range
in the continental
USA and Alaska.)
Willow Flycatcher
BCC - BCR (This is a
Bird of Conservation
Concern (BCC) only in
particular Bird
Conservation Regions
(BCRs) in the
continental USA)
Tell me more about conservation measures I can implement to avoid or minimize impacts to migratory birds.
Nationwide Conservation Measures describes measures that can help avoid and minimize impacts to all birds at
any location year round. Implementation of these measures is particularly important when birds are most likely to
occur in the project area. When birds may be breeding in the area, identifying the locations of any active nests and
avoiding their destruction is a very helpful impact minimization measure. To see when birds are most likely to
occur and be breeding in your project area, view the Probability of Presence Summary. Additional measures and/or
permits may be advisable depending on the type of activity you are conducting and the type of infrastructure or
bird species present on your project site.
What does IPaC use to generate the migratory birds potentially occurring in my speci ed location?
The Migratory Bird Resource List is comprised of USFWS Birds of Conservation Concern (BCC) and other species
that may warrant special attention in your project location.
The migratory bird list generated for your project is derived from data provided by the Avian Knowledge Network
(AKN). The AKN data is based on a growing collection of survey, banding, and citizen science datasets and is
queried and ltered to return a list of those birds reported as occurring in the 10km grid cell(s) which your project
intersects, and that have been identi ed as warranting special attention because they are a BCC species in that
area, an eagle (Eagle Act requirements may apply), or a species that has a particular vulnerability to o shore
activities or development.
Again, the Migratory Bird Resource list includes only a subset of birds that may occur in your project area. It is not
representative of all birds that may occur in your project area. To get a list of all birds potentially present in your
project area, please visit the AKN Phenology Tool.
What does IPaC use to generate the probability of presence graphs for the migratory birds potentially
occurring in my speci ed location?
The probability of presence graphs associated with your migratory bird list are based on data provided by the
Avian Knowledge Network (AKN). This data is derived from a growing collection of survey, banding, and citizen
science datasets .
Probability of presence data is continuously being updated as new and better information becomes available. To
learn more about how the probability of presence graphs are produced and how to interpret them, go the
Probability of Presence Summary and then click on the "Tell me about these graphs" link.
How do I know if a bird is breeding, wintering, migrating or present year-round in my project area?
To see what part of a particular bird's range your project area falls within (i.e. breeding, wintering, migrating or
year-round), you may refer to the following resources: The Cornell Lab of Ornithology All About Birds Bird Guide, or
(if you are unsuccessful in locating the bird of interest there), the Cornell Lab of Ornithology Neotropical Birds
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guide. If a bird on your migratory bird species list has a breeding season associated with it, if that bird does occur
in your project area, there may be nests present at some point within the timeframe speci ed. If "Breeds
elsewhere" is indicated, then the bird likely does not breed in your project area.
What are the levels of concern for migratory birds?
Migratory birds delivered through IPaC fall into the following distinct categories of concern:
1. "BCC Rangewide" birds are Birds of Conservation Concern (BCC) that are of concern throughout their range
anywhere within the USA (including Hawaii, the Paci c Islands, Puerto Rico, and the Virgin Islands);
2. "BCC - BCR" birds are BCCs that are of concern only in particular Bird Conservation Regions (BCRs) in the
continental USA; and
3. "Non-BCC - Vulnerable" birds are not BCC species in your project area, but appear on your list either because of
the Eagle Act requirements (for eagles) or (for non-eagles) potential susceptibilities in o shore areas from
certain types of development or activities (e.g. o shore energy development or longline shing).
Although it is important to try to avoid and minimize impacts to all birds, e orts should be made, in particular, to
avoid and minimize impacts to the birds on this list, especially eagles and BCC species of rangewide concern. For
more information on conservation measures you can implement to help avoid and minimize migratory bird
impacts and requirements for eagles, please see the FAQs for these topics.
Details about birds that are potentially a ected by o shore projects
For additional details about the relative occurrence and abundance of both individual bird species and groups of
bird species within your project area o the Atlantic Coast, please visit the Northeast Ocean Data Portal. The Portal
also o ers data and information about other taxa besides birds that may be helpful to you in your project review.
Alternately, you may download the bird model results les underlying the portal maps through the NOAA NCCOS
Integrative Statistical Modeling and Predictive Mapping of Marine Bird Distributions and Abundance on the Atlantic
Outer Continental Shelf project webpage.
Bird tracking data can also provide additional details about occurrence and habitat use throughout the year,
including migration. Models relying on survey data may not include this information. For additional information on
marine bird tracking data, see the Diving Bird Study and the nanotag studies or contact Caleb Spiegel or Pam
Loring.
What if I have eagles on my list?
If your project has the potential to disturb or kill eagles, you may need to obtain a permit to avoid violating the
Eagle Act should such impacts occur.
Proper Interpretation and Use of Your Migratory Bird Report
The migratory bird list generated is not a list of all birds in your project area, only a subset of birds of priority
concern. To learn more about how your list is generated, and see options for identifying what other birds may be
in your project area, please see the FAQ “What does IPaC use to generate the migratory birds potentially occurring
in my speci ed location”. Please be aware this report provides the “probability of presence” of birds within the 10
km grid cell(s) that overlap your project; not your exact project footprint. On the graphs provided, please also look
carefully at the survey e ort (indicated by the black vertical bar) and for the existence of the “no data” indicator (a
red horizontal bar). A high survey e ort is the key component. If the survey e ort is high, then the probability of
presence score can be viewed as more dependable. In contrast, a low survey e ort bar or no data bar means a lack
of data and, therefore, a lack of certainty about presence of the species. This list is not perfect; it is simply a starting
point for identifying what birds of concern have the potential to be in your project area, when they might be there,
and if they might be breeding (which means nests might be present). The list helps you know what to look for to
con rm presence, and helps guide you in knowing when to implement conservation measures to avoid or
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minimize potential impacts from your project activities, should presence be con rmed. To learn more about
conservation measures, visit the FAQ “Tell me about conservation measures I can implement to avoid or minimize
impacts to migratory birds” at the bottom of your migratory bird trust resources page.
Facilities
National Wildlife Refuge lands
Any activity proposed on lands managed by the National Wildlife Refuge system must undergo a
'Compatibility Determination' conducted by the Refuge. Please contact the individual Refuges to
discuss any questions or concerns.
THERE ARE NO REFUGE LANDS AT THIS LOCATION.
Fish hatcheries
THERE ARE NO FISH HATCHERIES AT THIS LOCATION.
Wetlands in the National Wetlands Inventory
Impacts to NWI wetlands and other aquatic habitats may be subject to regulation under Section 404
of the Clean Water Act, or other State/Federal statutes.
For more information please contact the Regulatory Program of the local U.S. Army Corps of
Engineers District.
Please note that the NWI data being shown may be out of date. We are currently working to update
our NWI data set. We recommend you verify these results with a site visit to determine the actual
extent of wetlands on site.
This location overlaps the following wetlands:
Data limitations
FRESHWATER EMERGENT WETLAND
PEM1A
PEM1C
A full description for each wetland code can be found at the National Wetlands Inventory website
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The Service's objective of mapping wetlands and deepwater habitats is to produce reconnaissance level
information on the location, type and size of these resources. The maps are prepared from the analysis of high
altitude imagery. Wetlands are identi ed based on vegetation, visible hydrology and geography. A margin of error
is inherent in the use of imagery; thus, detailed on-the-ground inspection of any particular site may result in
revision of the wetland boundaries or classi cation established through image analysis.
The accuracy of image interpretation depends on the quality of the imagery, the experience of the image analysts,
the amount and quality of the collateral data and the amount of ground truth veri cation work conducted.
Metadata should be consulted to determine the date of the source imagery used and any mapping problems.
Wetlands or other mapped features may have changed since the date of the imagery or eld work. There may be
occasional di erences in polygon boundaries or classi cations between the information depicted on the map and
the actual conditions on site.
Data exclusions
Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial
imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged
aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and nearshore coastal waters.
Some deepwater reef communities (coral or tuber cid worm reefs) have also been excluded from the inventory.
These habitats, because of their depth, go undetected by aerial imagery.
Data precautions
Federal, state, and local regulatory agencies with jurisdiction over wetlands may de ne and describe wetlands in a
di erent manner than that used in this inventory. There is no attempt, in either the design or products of this
inventory, to de ne the limits of proprietary jurisdiction of any Federal, state, or local government or to establish
the geographical scope of the regulatory programs of government agencies. Persons intending to engage in
activities involving modi cations within or adjacent to wetland areas should seek the advice of appropriate federal,
state, or local agencies concerning speci ed agency regulatory programs and proprietary jurisdictions that may
a ect such activities.
MULBERRY CONNECTION │SWMP REPORT
APPENDIX B – EROSION CONTROL PLANS AND DETAILS
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
NOT FOR
Kimley-Horn and Associates, Inc.
CONSTRUCTION
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Know what's below.
Call before you dig.
4 EROSION CONTROL PLAN - INITIAL096501004_CD_EC
NORTH
LEGEND
APPLICABLE CONTROL MEASURE DETAILS EROSION CONTROL ADDITIONAL NOTES
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
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Call before you dig.
5 EROSION CONTROL PLAN - FINAL096501004_CD_EC
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APPLICABLE CONTROL MEASURE DETAILSEROSION CONTROL ADDITIONAL NOTES
RRMULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
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Kimley-Horn and Associates, Inc.
CONSTRUCTION
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Know what's below.
Call before you dig.NORTHAPPLICABLE CONTROL MEASURE DETAILSEROSION CONTROL ADDITIONAL NOTES
LEGEND
6 OFF-SITE INITIAL EROSION CONTROL096501004_CD_EC_OFF
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
NOT FOR
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CONSTRUCTION
OF 39
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Know what's below.
Call before you dig.NORTHLEGEND
APPLICABLE CONTROL MEASURE DETAILSEROSION CONTROL ADDITIONAL NOTES
7 OFF-SITE FINAL EROSION CONTROL096501004_CD_EC_OFF
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
NOT FOR
Kimley-Horn and Associates, Inc.
CONSTRUCTION
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Know what's below.
Call before you dig.
8 EROSION CONTROL DETAILS096501004_CD_EC_DT
SWMP INFORMATION
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
NOT FOR
Kimley-Horn and Associates, Inc.
CONSTRUCTION
OF 39
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Know what's below.
Call before you dig.
9 EROSION CONTROL DETAILS096501004_CD_EC_DT
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
NOT FOR
Kimley-Horn and Associates, Inc.
CONSTRUCTION
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10 EROSION CONTROL DETAILS096501004_CD_EC_DT
MULBERRY CONNECTIONCITY OF FORT COLLINSUTILITY PLANS AND CONSTRUCTION DOCUMENTSFOR REVIEW ONLY
NOT FOR
Kimley-Horn and Associates, Inc.
CONSTRUCTION
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11
MULBERRY CONNECTION │SWMP REPORT
APPENDIX C – PERMIT INFORMATION
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Water Quality Control Division
CDPS GENERAL PERMIT
STORMWATER DISCHARGES ASSOCIATED WITH
CONSTRUCTION ACTIVITY
AUTHORIZATION TO DISCHARGE UNDER THE
COLORADO DISCHARGE PERMIT SYSTEM (CDPS)
In compliance with the provisions of the Colorado Water Quality Control Act, (25-8-101 et seq., CRS, 1973 as
amended) and the Federal Water Pollution Control Act, as amended (33 U.S.C. 1251 et seq.; the "Act"), this
permit authorizes the discharge of stormwater associated with construction activities (and specific
allowable non-stormwater discharges in accordance with Part I.A.1. of the permit) certified under this
permit, from those locations specified throughout the State of Colorado to specified waters of the State.
Such discharges shall be in accordance with the conditions of this permit. This permit specifically authorizes
the facility listed on the certification to discharge in accordance with permit requirements and conditions
set forth in Parts I and II hereof. All discharges authorized herein shall be consistent with the terms and
conditions of this permit.
This permit becomes effective on April 1, 2019, and shall expire at midnight March 31, 2024.
Issued and signed this 1st day of November 2018.
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Ellen Howard Kutzer, Permits Section Manager
Water Quality Control Division
Permit History
Originally signed and issued October 31, 2018; effective April 1, 2019.
Table of Contents
Part I ........................................................................................................................... 1
COVERAGE UNDER THIS PERMIT...................................................................................... 1
Authorized Discharges ............................................................................................ 1
Limitations on Coverage .......................................................................................... 1
Permit Certification and Submittal Procedures ............................................................... 2
EFFLUENT LIMITATIONS ............................................................................................... 6
Requirements for Control Measures Used to Meet Effluent Limitations ................................... 6
Discharges to an Impaired Waterbody .......................................................................... 9
General Requirements ........................................................................................... 10
STORMWATER MANAGEMENT PLAN (SWMP) REQUIREMENTS .................................................... 11
SWMP General Requirements ................................................................................... 11
SWMP Content .................................................................................................... 11
SWMP Review and Revisions .................................................................................... 13
SWMP Availability ................................................................................................. 14
SITE INSPECTIONS ..................................................................................................... 14
Person Responsible for Conducting Inspections .............................................................. 14
Inspection Frequency ............................................................................................ 14
Inspection Frequency for Discharges to Outstanding Waters ............................................... 15
Reduced Inspection Frequency ................................................................................. 15
Inspection Scope .................................................................................................. 16
DEFINITIONS ........................................................................................................... 17
MONITORING ........................................................................................................... 20
Oil and Gas Construction ............................................................................................ 21
Part II: Standard Permit Conditions ...................................................................................... 22
DUTY TO COMPLY ..................................................................................................... 22
DUTY TO REAPPLY .................................................................................................... 22
NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE ........................................................... 22
DUTY TO MITIGATE ................................................................................................... 22
PROPER OPERATION AND MAINTENANCE .......................................................................... 22
PERMIT ACTIONS ...................................................................................................... 22
PROPERTY RIGHTS .................................................................................................... 22
DUTY TO PROVIDE INFORMATION ................................................................................... 23
INSPECTION AND ENTRY ............................................................................................. 23
MONITORING AND RECORDS ......................................................................................... 23
SIGNATORY REQUIREMENTS ......................................................................................... 24
PART I
Permit No.: COR400000
Authorization to Sign: ............................................................................................ 24
Electronic Signatures ............................................................................................ 25
Change in Authorization to Sign ................................................................................ 25
REPORTING REQUIREMENTS ......................................................................................... 25
Planned Changes .................................................................................................. 25
Anticipated Non-Compliance ................................................................................... 25
Transfer of Ownership or Control .............................................................................. 25
Monitoring reports ................................................................................................ 26
Compliance Schedules ........................................................................................... 26
Twenty-four hour reporting ..................................................................................... 26
Other non-compliance ........................................................................................... 27
Other information ................................................................................................ 27
BYPASS ................................................................................................................. 27
Bypass not exceeding limitations .............................................................................. 27
Notice of bypass .................................................................................................. 27
Prohibition of Bypass ............................................................................................. 27
UPSET................................................................................................................... 28
Effect of an upset ................................................................................................ 28
Conditions necessary for demonstration of an Upset ....................................................... 28
Burden of Proof ................................................................................................... 28
RETENTION OF RECORDS ............................................................................................. 28
Post-Expiration or Termination Retention .................................................................... 28
On-site Retention ................................................................................................. 29
REOPENER CLAUSE .................................................................................................... 29
Procedures for modification or revocation ................................................................... 29
Water quality protection ........................................................................................ 29
SEVERABILITY .......................................................................................................... 29
NOTIFICATION REQUIREMENTS ...................................................................................... 29
Notification to Parties ........................................................................................... 29
RESPONSIBILITIES ..................................................................................................... 30
Reduction, Loss, or Failure of Treatment Facility ........................................................... 30
Oil and Hazardous Substance Liability ............................................................................. 30
Emergency Powers .................................................................................................... 30
Confidentiality ........................................................................................................ 30
Fees ..................................................................................................................... 30
PART I
Permit No.: COR400000
Duration of Permit .................................................................................................... 30
Section 307 Toxics .................................................................................................... 30
PART I
Permit No.: COR400000
Page 1 of 33
Part I
Note: At the first mention of terminology that has a specific connotation for the purposes of this permit, the
terminology is electronically linked to the definitions section of the permit in Part I.E.
COVERAGE UNDER THIS PERMIT
Authorized Discharges
This general permit authorizes permittee(s) to discharge the following to state waters:
stormwater associated with construction activity and specified non-stormwater associated
with construction activity. The following types of stormwater and non-stormwater
discharges are authorized under this permit:
Allowable Stormwater Discharges
i. Stormwater discharges associated with construction activity.
ii. Stormwater discharges associated with producing earthen materials, such as soils,
sand, and gravel dedicated to providing material to a single contiguous site, or
within ¼ mile of a construction site (i.e. borrow or fill areas)
iii. Stormwater discharges associated with dedicated asphalt, concrete batch plants
and masonry mixing stations (Coverage under this permit is not required if
alternative coverage has been obtained.)
Allowable Non-Stormwater Discharges
The following non-stormwater discharges are allowable under this permit if the
discharges are identified in the stormwater management plan in accordance with Part
I.C. and if they have appropriate control measures in accordance with Part I.B.1.
i. Discharges from uncontaminated springs that do not originate from an area of land
disturbance.
ii. Discharges to the ground of concrete washout water associated with the washing of
concrete tools and concrete mixer chutes. Discharges of concrete washout water
must not leave the site as surface runoff or reach receiving waters as defined by
this permit.
iii. Discharges of landscape irrigation return flow.
Emergency Fire Fighting
Discharges resulting from emergency firefighting activities are authorized by this
permit.
Limitations on Coverage
Discharges not authorized by this permit include, but are not limited to, the discharges
and activities listed below. Permittees may seek individual or alternate general permit
coverage for the discharges, as appropriate and available.
Discharges of Non-Stormwater
PART I
Permit No.: COR400000
Page 2 of 33
Discharges of non-stormwater, except the authorized non-stormwater discharges listed
in Part I.A.1.b., are not eligible for coverage under this permit.
Discharges Currently Covered by another Individual or General Permit
Discharges Currently Covered by a Water Quality Control Division (division) Low Risk
Guidance Document
Permit Certification and Submittal Procedures
Duty to apply
The following activities shall apply for coverage under this permit:
i. Construction sites that will disturb one acre or more; or
ii. Construction sites that are part of a common plan of development or sale; or
iii. Stormwater discharges that are designated by the division as needing a stormwater
permit because the discharge:
(a) Contributes to a violation of a water quality standard; or
(b) is a significant contributor of pollutants to state waters.
Application Requirements
To obtain authorization to discharge under this permit, applicants applying for
coverage following the effective date of the renewal permit shall meet the following
requirements:
i. Owners and operators submitting an application for permit coverage will be co-
permittees subject to the same benefits, duties, and obligations under this permit.
ii. Signature requirements: Both the owner and operator (permittee) of the
construction site, as defined in Part I.E., must agree to the terms and conditions of
the permit and submit a completed application that includes the signature of both
the owner and the operator. In cases where the duties of the owner and operator
are managed by the owner, both application signatures may be completed by the
owner. Both the owner and operator are responsible for ensuring compliance with
all terms and conditions of the permit, including implementation of the stormwater
management plan.
iii. Applicants must use the paper form provided by the division or the electronic form
provided on the division’s web-based application platform when applying for
coverage under this permit.
iv. The applicant(s) must develop a stormwater management plan (SWMP) in
accordance with the requirements of Part I.C. The applicant(s) must also certify
that the SWMP is complete, or will be complete, prior to commencement of any
construction activity.
PART I
Permit No.: COR400000
Page 3 of 33
v. The applicant(s) must submit a complete, accurate, and signed permit application
electronically, by mail or hand delivery to the division at least 10 days prior to the
commencement of construction activity except that construction activities that are
in response to a public emergency related site shall apply for coverage no later
than 14 days after the commencement of construction activities. The provisions of
this part in no way remove a violation of the Colorado Water Quality Control Act if
a point source discharge occurs prior to the issuance of a CDPS permit.
vi. The application must be signed in accordance with the requirements of Part IA.
Applications submitted by mail or hand delivered should be directed to:
Colorado Department of Public Health and Environment
Water Quality Control Division
Permits Section, WQCD-PS-B2
4300 Cherry Creek Drive South
Denver, CO 80246
vii. The applicant(s) must receive written notification that the division granted permit
coverage prior to conducting construction activities except for construction
activities that are in response to a public emergency related site
Division Review of Permit Application
Within 10 days of receipt of the application, and following review of the application,
the division may:
i. Issue a certification of coverage;
ii. request additional information necessary to evaluate the discharge;
iii. delay the authorization to discharge pending further review;
iv. notify the applicant that additional terms and conditions are necessary; or
v. deny the authorization to discharge under this general permit.
Alternative Permit Coverage
i. Division Required Alternate Permit Coverage:
The Division may require an applicant or permittee to apply for an individual
permit or an alternative general permit if it determines the discharge does not fall
under the scope of this general permit. In this case, the Division will notify the
applicant or permittee that an individual permit application is required.
ii. Permittee Request for alternate permit coverage:
A permittee authorized to discharge stormwater under this permit may request to
be excluded from coverage under this general permit by applying for an individual
permit. In this case, the permittee must submit an individual application, with
reasons supporting the request, to the Division at least 180 days prior to any
discharge. When an individual permit is issued, the permittee’s authorization to
discharge under this permit is terminated on the effective date of the individual
permit.
Submittal Signature Requirements
PART I
Permit No.: COR400000
Page 4 of 33
Documents required for submittal to the division in accordance with this permit,
including applications for permit coverage and other documents as requested by the
division, must include signatures by both the owner and the operator, except for
instances where the duties of the owner and operator are managed by the owner.
Signatures on all documents submitted to the division as required by this permit must
meet the Standard Signatory Requirements in Part II.K. of this permit in accordance
with 40 C.F.R. 122.41(k).
i. Signature Certification
Any person(s) signing documents required for submittal to the Division must make
the following certification:
“I certify under penalty of law that this document and all attachments were
prepared under my direction or supervision in accordance with a system designed
to assure that qualified personnel properly gather and evaluate the information
submitted. Based on my inquiry of the person or persons who manage the system,
or those persons directly responsible for gathering the information, the
information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false
information, including the possibility of fine and imprisonment for knowing
violations.”
Compliance Document Signature Requirements
Documents which are required for compliance with the permit, but for which
submittal to the division is not required unless specifically requested by the division,
must be signed by the individual(s) designated as the Qualified Stormwater Manager,
as defined in Part I.E.
i. Any person(s) signing inspection documents required for compliance with the
permit must make the following statement:
“I verify that, to the best of my knowledge and belief, all corrective action and
maintenance items identified during the inspection are complete, and the site is
currently in compliance with the permit.”
Field Wide Permit Coverage for Oil and Gas Construction
At the discretion of the division, a single permit certification may be issued to a single
oil and gas permittee to cover construction activity related discharges from an oil and
gas field at multiple locations that are not necessarily contiguous.
Permit Coverage without Application
Qualifying Local Program: When a small construction site is within the jurisdiction of a
qualifying local program, the owner and operator of the construction activity are
authorized to discharge stormwater associated with small construction activity under
this general permit without the submittal of an application to the division. Sites
covered by a qualifying local program are exempt from the following sections of this
general permit:
PART I
Permit No.: COR400000
Page 5 of 33
Part I.A.3.a.; Part I.A.3.b.; Part I.A.3.c.; Part I.A.3.d.; Part I.A.3.g.; Part I.A.3.i.; Part
I.A.3.j.; Part I.A.3.k.
Sites covered by a qualifying local program are subject to the following requirements:
i. Local Agency Authority: This permit does not pre-empt or supersede the authority
of local agencies to prohibit, restrict, or control discharges of stormwater to storm
drain systems or other water courses within their jurisdiction.
ii. Permit Coverage Termination: When a site under a Qualifying Local Program is
finally stabilized, coverage under this permit is automatically terminated.
iii. Compliance with Qualifying Local Program: Qualifying Local Program requirements
that are equivalent to the requirements of this permit are incorporated by
reference. Permittees authorized to discharge under this permit, must comply
with the equivalent requirements of the Qualifying Local Program that has
jurisdiction over the site as a condition of this permit.
iv. Compliance with Remaining Permit Conditions. Requirements of this permit that
are in addition to or more stringent than the requirements of the Qualifying Local
Program apply in addition to the requirements of the Qualifying Local Program.
v. Written Authorization of Coverage: The division or local municipality may require
any permittee within the jurisdiction of a Qualifying Local Program covered under
this permit to apply for, and obtain written authorization of coverage under this
permit. The permittee must be notified in writing that an application for written
authorization of coverage is required.
Permittee Initiated Permit Actions
Permittee initiated permit actions, including but not limited to modifications, contact
changes, transfers, reassignments, and terminations, shall be conducted following
division guidance and using appropriate division-provided forms.
Sale of Residence to Homeowner
Residential construction sites only: The permittee may remove residential lots from
permit coverage once the lot meets the following criteria:
i. the residential lot has been sold to the homeowner(s) for private residential use;
ii. a certificate of occupancy, or equivalent, is maintained on-site and is available
during division inspections;
iii. the lot is less than one acre of disturbance;
iv. all construction activity conducted on the lot by the permittee is complete;
v. the permittee is not responsible for final stabilization of the lot; and
vi. the SWMP was modified to indicate the lot is no longer part of the construction
activity.
If the residential lot meets the criteria listed above then activities occurring on the lot
are no longer considered to be construction activities with a duty to apply and
maintain permit coverage. Therefore, the permittee is not required to meet the final
stabilization requirements and may terminate permit coverage for the lot.
PART I
Permit No.: COR400000
Page 6 of 33
Permit Expiration and Continuation of Permit Coverage
Authorization to discharge under this general permit shall expire at midnight on March
31, 2024. While Regulation 61.4 requires a permittee to submit an application for
continuing permit coverage 180 days before the permit expires, the division is
requiring that permittees desiring continued coverage under this general permit must
reapply at least 90 days in advance of this permit expiration. The Division will
determine if the permittee may continue to discharge stormwater under the terms of
the general permit. An individual permit may be required for any facility not
reauthorized to discharge under the reissued general permit.
If this permit is not reissued or replaced prior to the expiration date, it will be
administratively continued and remain in force and effect. For permittees that have
applied for continued permit coverage, discharges authorized under this permit prior
to the expiration date will automatically remain covered by this permit until the
earliest of:
i. An authorization to discharge under a reissued permit, or a replacement of this
permit, following the timely and appropriate submittal of a complete application
requesting authorization to discharge under the new permit and compliance with
the requirements of the new permit; or
ii. The issuance and effect of a termination issued by the Division; or
iii. The issuance or denial of an individual permit for the facility’s discharges; or
iv. A formal permit decision by the Division not to reissue this general permit, at
which time the Division will identify a reasonable time period for covered
dischargers to seek coverage under an alternative general permit or an individual
permit. Coverage under this permit will cease when coverage under another
permit is granted/authorized; or
v. The Division has informed the permittee that discharges previously authorized
under this permit are no longer covered under this permit.
EFFLUENT LIMITATIONS
Requirements for Control Measures Used to Meet Effluent Limitations
The permittee must implement control measures to minimize the discharge of pollutants
from all potential pollutant sources at the site. Control measures must be installed prior
to commencement of activities that may contribute pollutants to stormwater discharges.
Control measures must be selected, designed, installed and maintained in accordance
with good engineering, hydrologic and pollution control practices. Control measures
implemented at the site must be designed to prevent pollution or degradation of state
waters.
Stormwater Pollution Prevention
The permittee must implement structural and/or nonstructural control measures that
effectively minimize erosion, sediment transport, and the release of other pollutants
related to construction activity.
i. Control Measures for Erosion and Sediment Control
PART I
Permit No.: COR400000
Page 7 of 33
Control measures for erosion and sediment control may include, but are not
limited to, wattles/sediment control logs, silt fences, earthen dikes, drainage
swales, sediment traps, subsurface drains, pipe slope drains, inlet protection,
outlet protection, gabions, sediment basins, temporary vegetation, permanent
vegetation, mulching, geotextiles, sod stabilization, slope roughening, maintaining
existing vegetation, protection of trees, and preservation of mature vegetation.
Specific non-structural control measures must meet the requirements listed below.
Specific control measures must meet the requirements listed below.
(a) Vehicle tracking controls shall either be implemented to minimize vehicle
tracking of sediment from disturbed areas, or the areas where vehicle tracking
occurs shall meet subsection Part I.B.1.a.i(b);
(b) Stormwater runoff from all disturbed areas and soil storage areas for which
permanent or temporary stabilization is not implemented, must flow to at least
one control measure to minimize sediment in the discharge. This may be
accomplished through filtering, settling, or straining. The control measure
must be selected, designed, installed and adequately sized in accordance with
good engineering, hydrologic and pollution control practices. The control
measure(s) must contain or filter flows in order to prevent the bypass of flows
without treatment and must be appropriate for stormwater runoff from
disturbed areas and for the expected flow rate, duration, and flow conditions
(i.e., sheet or concentrated flow);
(c) Outlets that withdraw water from or near the surface shall be installed when
discharging from basins and impoundments, unless infeasible.
(d) Maintain pre-existing vegetation or equivalent control measures for areas
within 50 horizontal feet of receiving waters as defined by this permit, unless
infeasible.
(e) Soil compaction must be minimized for areas where infiltration control
measures will occur or where final stabilization will be achieved through
vegetative cover.
(f) Unless infeasible, topsoil shall be preserved for those areas of a site that will
utilize vegetative final stabilization.
(g) Minimize the amount of soil exposed during construction activity, including the
disturbance of steep slopes.
ii. Practices for Other Common Pollutants
(a) Bulk storage, 55 gallons or greater, for petroleum products and other liquid
chemicals must have secondary containment, or equivalent protection, in order
to contain spills and to prevent spilled material from entering state waters.
(b) Control measures designed for concrete washout waste must be implemented.
This includes washout waste discharged to the ground as authorized under this
permit and washout waste from concrete trucks and masonry operations
contained on site. The permittee must ensure the washing activities do not
contribute pollutants to stormwater runoff, or receiving waters in accordance
Part I.A.1.b.ii. Discharges that may reach groundwater must flow through soil
PART I
Permit No.: COR400000
Page 8 of 33
that has buffering capacity prior to reaching groundwater, as necessary to
meet the effluent limits in this permit, including Part I.B.3.a. The concrete
washout location shall be not be located in an area where shallow
groundwater may be present and would result in buffering capacity not being
adequate, such as near natural drainages, springs, or wetlands. This permit
authorizes discharges to the ground of concrete washout waste.
iii. Stabilization Requirements
The following requirements must be implemented for each site.
(a) Temporary stabilization must be implemented for earth disturbing activities
on any portion of the site where ground disturbing construction activity has
permanently ceased, or temporarily ceased for more than 14 calendar days.
Temporary stabilization methods may include, but are not limited to, tarps,
soil tackifier, and hydroseed. The permittee may exceed the 14-day schedule
when either the function of the specific area of the site requires it to remain
disturbed, or, physical characteristics of the terrain and climate prevent
stabilization. The SWMP must document the constraints necessitating the
alternative schedule, provide the alternate stabilization schedule, and identify
all locations where the alternative schedule is applicable on the site map.
(b) Final stabilization must be implemented for all construction sites. Final
stabilization is reached when all ground surface disturbing activities at the
construction site are complete; and, for all areas of ground surface disturbing
activities, either a uniform vegetative cover with an individual plant density of
at least 70 percent of pre-disturbance levels is established, or equivalent
permanent alternative stabilization methods are implemented. The division
may approve alternative final stabilization criteria for specific operations.
(c) Final stabilization must be designed and installed as a permanent feature. Final
stabilization measures for obtaining a vegetative cover or alternative
stabilization methods include, but are not limited to, the following as
appropriate:
(1) Seed mix selection and application methods;
(2) Soil preparation and amendments;
(3) Soil stabilization methods (e.g., crimped straw, hydro mulch or rolled
erosion control products);
(4) Appropriate sediment control measures as needed until final stabilization is
achieved;
(5) Permanent pavement, hardscape, xeriscape, stabilized driving surfaces;
(6) Other alternative stabilization practices as applicable;
PART I
Permit No.: COR400000
Page 9 of 33
(d) The permittee(s) must ensure all temporary control measures are removed
from the construction site once final stabilization is achieved, except when the
control measure specifications allow the control measure to be left in place
(i.e., bio-degradable control measures).
Maintenance
The permittee must ensure that all control measures remain in effective operating
condition and are protected from activities that would reduce their effectiveness.
Control measures must be maintained in accordance with good engineering, hydrologic
and pollution control practices. Observations leading to the required maintenance of
control measures can be made during a site inspection, or during general observations
of site conditions. The necessary repairs or modifications to a control measure
requiring routine maintenance, as defined in Part I.E., must be conducted to maintain
an effective operating condition. This section is not subject to the requirements in
Part I.B.1.c. below.
Corrective Actions
The permittee must assess the adequacy of control measures at the site, and the need
for changes to those control measures, to ensure continued effective performance.
When an inadequate control measure, as defined in Part I.E., is identified (i.e., new or
replacement control measures become necessary), the following corrective action
requirements apply. The permittee is in noncompliance with the permit until the
inadequate control measure is replaced or corrected and returned to effective
operating condition in compliance with Part I.B.1. and the general requirements in
Part I.B.3. If the inadequate control measure results in noncompliance that meets the
conditions of Part II.L., the permittee must also meet the requirements of that
section.
i. The permittee must take all necessary steps to minimize or prevent the discharge
of pollutants, until a control measure is implemented and made operational and/or
an inadequate control measure is replaced or corrected and returned to effective
operating condition. If it is infeasible to install or repair of control measure
immediately after discovering the deficiency, the following must be documented
and kept on record in accordance with the recordkeeping requirements in Part II.
(a) Describe why it is infeasible to initiate the installation or repair immediately;
and
(b) Provide a schedule for installing or repairing the control measure and returning
it to an effective operating condition as soon as possible.
ii. If applicable, the permittee must remove and properly dispose of any unauthorized
release or discharge (e.g., discharge of non-stormwater, spill, or leak not
authorized by this permit.) The permittee must also clean up any contaminated
surfaces to minimize discharges of the material in subsequent storm events.
Discharges to an Impaired Waterbody
Total Maximum Daily Load (TMDL)
If the permittee’s discharge flows to or could reasonably be expected to flow to any
water body for which a TMDL has been approved, and stormwater discharges
PART I
Permit No.: COR400000
Page 10 of 33
associated with construction activity were assigned a pollutant-specific Wasteload
Allocation (WLA) under the TMDL, the division may:
i. ensure the WLA is implemented properly through alternative local requirements,
such as by a municipal stormwater permit; or
ii. notify the permittee of the WLA and amend the permittee’s certification to add
specific effluent limits and other requirements, as appropriate. The permittee may
be required to do the following:
(a) under the permittee’s SWMP, implement specific control measures based on
requirements of the WLA, and evaluate whether the requirements are met
through implementation of existing stormwater control measures or if
additional control measures are necessary. Document the calculations or other
evidence demonstrating that the requirements are expected to be met; and
(b) if the evaluation shows that additional or modified control measures are
necessary, describe the type and schedule for the control measure additions or
modifications.
iii. Discharge monitoring may also be required. The permittee may maintain coverage
under the general permit provided they comply with the applicable requirements
outlined above. The division reserves the right to require individual or alternate
general permit coverage.
General Requirements
Discharges authorized by this permit shall not cause, have the reasonable potential to
cause, or measurably contribute to an exceedance of any applicable water quality
standard, including narrative standards for water quality.
The division may require sampling and testing, on a case-by-case basis, in the event
that there is reason to suspect that the SWMP is not adequately minimizing pollutants
in stormwater or in order to measure the effectiveness of the control measures in
removing pollutants in the effluent. Such monitoring may include Whole Effluent
Toxicity testing.
The permittee must comply with the lawful requirements of federal agencies,
municipalities, counties, drainage districts and other local agencies including
applicable requirements in Municipal Stormwater Management Programs developed to
comply with CDPS permits. The permittee must comply with local stormwater
management requirements, policies and guidelines including those for erosion and
sediment control.
All construction site wastes must be properly managed to prevent potential pollution
of state waters. This permit does not authorize on-site waste disposal.
This permit does not relieve the permittee of the reporting requirements in 40 CFR
110, 40 CFR 117 or 40 CFR 302. Any discharge of hazardous material must be handled
in accordance with the division's Noncompliance Notification Requirements (see Part
II.L. of the permit).
PART I
Permit No.: COR400000
Page 11 of 33
STORMWATER MANAGEMENT PLAN (SWMP) REQUIREMENTS
SWMP General Requirements
A SWMP shall be developed for each construction site covered by this permit. The
SWMP must be prepared in accordance with good engineering, hydrologic and pollution
control practices.
i. For public emergency related sites a SWMP shall be created no later than 14 days
after the commencement of construction activities.
The permittee must implement the provisions of the SWMP as written and updated,
from commencement of construction activity until final stabilization is complete. The
division may review the SWMP.
A copy of the SWMP must be retained onsite or be onsite when construction activities
are occurring at the site unless the permittee specifies another location and obtains
approval from the division.
SWMP Content
The SWMP, at a minimum, must include the following elements.
i. Qualified Stormwater Manager. The SWMP must list individual(s) by title and name
who are designated as the site’s qualified stormwater manager(s) responsible for
implementing the SWMP in its entirety. This role may be filled by more than one
individual.
ii. Spill Prevention and Response Plan. The SWMP must have a spill prevention and
response plan. The plan may incorporate by reference any part of a Spill
Prevention Control and Countermeasure (SPCC) plan under section 311 of the Clean
Water Act (CWA) or a Spill Prevention Plan required by a separate CDPS permit.
The relevant sections of any referenced plans must be available as part of the
SWMP consistent with Part I.C.4.
iii. Materials Handling. The SWMP must describe and locate all control measures
implemented at the site to minimize impacts from handling significant materials
that could contribute pollutants to runoff. These handling procedures can include
control measures for pollutants and activities such as, exposed storage of building
materials, paints and solvents, landscape materials, fertilizers or chemicals,
sanitary waste material, trash and equipment maintenance or fueling procedures.
iv. Potential Sources of Pollution. The SWMP must list all potential sources of pollution
which may reasonably be expected to affect the quality of stormwater discharges
associated with construction activity from the site. This shall include, but is not
limited to, the following pollutant sources:
(a) disturbed and stored soils;
(b) vehicle tracking of sediments;
(c) management of contaminated soils;
(d) loading and unloading operations;
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(e) outdoor storage activities (erodible building materials, fertilizers, chemicals,
etc.);
(f) vehicle and equipment maintenance and fueling;
(g) significant dust or particulate generating processes (e.g., saw cutting material,
including dust);
(h) routine maintenance activities involving fertilizers, pesticides, herbicides,
detergents, fuels, solvents, oils, etc.;
(i) on-site waste management practices (waste piles, liquid wastes, dumpsters);
(j) concrete truck/equipment washing, including washing of the concrete truck
chute and associated fixtures and equipment;
(k) dedicated asphalt, concrete batch plants and masonry mixing stations;
(l) non-industrial waste sources such as worker trash and portable toilets.
v. Implementation of Control Measures. The SWMP must include design specifications
that contain information on the implementation of the control measure in
accordance with good engineering hydrologic and pollution control practices;
including as applicable drawings, dimensions, installation information, materials,
implementation processes, control measure-specific inspection expectations, and
maintenance requirements.
The SWMP must include a documented use agreement between the permittee and
the owner or operator of any control measures located outside of the permitted
area, that are utilized by the permittee’s construction site for compliance with
this permit, but not under the direct control of the permittee. The permittee is
responsible for ensuring that all control measures located outside of their
permitted area, that are being utilized by the permittee’s construction site, are
properly maintained and in compliance with all terms and conditions of the permit.
The SWMP must include all information required of and relevant to any such
control measures located outside the permitted area, including location,
installation specifications, design specifications and maintenance requirements.
vi. Site Description. The SWMP must include a site description which includes, at a
minimum, the following:
(a) the nature of the construction activity at the site;
(b) the proposed schedule for the sequence for major construction activities and
the planned implementation of control measures for each phase. (e.g.:
clearing, grading, utilities, vertical, etc.);
(c) estimates of the total acreage of the site, and the acreage expected to be
disturbed by clearing, excavation, grading, or any other construction activities;
(d) a summary of any existing data used in the development of the construction
site plans or SWMP that describe the soil or existing potential for soil erosion;
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(e) a description of the percent of existing vegetative ground cover relative to the
entire site and the method for determining the percentage;
(f) a description of any allowable non-stormwater discharges at the site, including
those being discharged under a division low risk discharge guidance policy;
(g) a description of areas receiving discharge from the site. Including a description
of the immediate source receiving the discharge. If the stormwater discharge is
to a municipal separate storm sewer system, the name of the entity owning
that system, the location of the storm sewer discharge, and the ultimate
receiving water(s); and
(h) a description of all stream crossings located within the construction site
boundary.
vii. Site Map. The SWMP must include a site map which includes, at a minimum, the
following:
(a) construction site boundaries;
(b) flow arrows that depict stormwater flow directions on-site and runoff
direction;
(c) all areas of ground disturbance including areas of borrow and fill;
(d) areas used for storage of soil;
(e) locations of all waste accumulation areas, including areas for liquid, concrete,
masonry, and asphalt;
(f) locations of dedicated asphalt, concrete batch plants and masonry mixing
stations;
(g) locations of all structural control measures;
(h) locations of all non-structural control measures;
(i) locations of springs, streams, wetlands and other state waters, including areas
that require pre-existing vegetation be maintained within 50 feet of a receiving
water, where determined feasible in accordance with Part I.B.1.a.i.(d).; and
(j) locations of all stream crossings located within the construction site boundary.
viii. Final Stabilization and Long Term Stormwater Management. The SWMP must
describe the practices used to achieve final stabilization of all disturbed areas at
the site and any planned practices to control pollutants in stormwater discharges
that will occur after construction operations are completed. Including but not
limited to, detention/retention ponds, rain gardens, stormwater vaults, etc.
ix. Inspection Reports. The SWMP must include documented inspection reports in
accordance with Part ID.
SWMP Review and Revisions
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Permittees must keep a record of SWMP changes made that includes the date and
identification of the changes. The SWMP must be amended when the following occurs:
a change in design, construction, operation, or maintenance of the site requiring
implementation of new or revised control measures;
the SWMP proves ineffective in controlling pollutants in stormwater runoff in
compliance with the permit conditions;
control measures identified in the SWMP are no longer necessary and are removed;
and
corrective actions are taken onsite that result in a change to the SWMP.
For SWMP revisions made prior to or following a change(s) onsite, including revisions to
sections addressing site conditions and control measures, a notation must be included in
the SWMP that identifies the date of the site change, the control measure removed, or
modified, the location(s) of those control measures, and any changes to the control
measure(s). The permittee must ensure the site changes are reflected in the SWMP. The
permittee is noncompliant with the permit until the SWMP revisions have been made.
SWMP Availability
A copy of the SWMP must be provided upon request to the division, EPA, and any local
agency with authority for approving sediment and erosion plans, grading plans or
stormwater management plans within the time frame specified in the request. If the
SWMP is required to be submitted to any of these entities, the submission must include a
signed certification in accordance with Part I.A.3.e., certifying that the SWMP is complete
and compliant with all terms and conditions of the permit.
All SWMPs required under this permit are considered reports that must be available to the
public under Section 308(b) of the CWA and Section 61.5(4) of the CDPS regulations. The
permittee must make plans available to members of the public upon request. However,
the permittee may claim any portion of a SWMP as confidential in accordance with 40 CFR
Part 2.
SITE INSPECTIONS
Site inspections must be conducted in accordance with the following requirements. The
required inspection schedules are a minimum frequency and do not affect the permittee’s
responsibility to implement control measures in effective operating condition as prescribed in
the SWMP. Proper maintenance of control measures may require more frequent inspections.
Site inspections shall start within 7 calendar days of the commencement of construction
activities on site.
Person Responsible for Conducting Inspections
The person(s) inspecting the site may be on the permittee’s staff or a third party hired to
conduct stormwater inspections under the direction of the permittee(s). The permittee is
responsible for ensuring that the inspector is a qualified stormwater manager.
Inspection Frequency
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Permittees must conduct site inspections in accordance with one of the following
minimum frequencies, unless the site meets the requirements of Part ID.3
At least one inspection every 7 calendar days. Or
At least one inspection every 14 calendar days, if post-storm event inspections are
conducted within 24 hours after the end of any precipitation or snowmelt event that
causes surface erosion. Post-storm inspections may be used to fulfill the 14-day
routine inspection requirement.
When site conditions make the schedule required in this section impractical, the
permittee may petition the Division to grant an alternate inspection schedule. The
alternative inspection schedule may not be implemented prior to written approval by
the division and incorporation into the SWMP.
Inspection Frequency for Discharges to Outstanding Waters
Permittees must conduct site inspections at least once every 7 calendar days for sites that
discharge to a water body designated as an Outstanding Water by the Water Quality
Control Commission.
Reduced Inspection Frequency
The permittee may perform site inspections at the following reduced frequencies when
one of the following conditions exists:
Post-Storm Inspections at Temporarily Idle Sites
For permittees choosing to combine 14-day inspections and post-storm-event-
inspections, if no construction activities will occur following a storm event, post-storm
event inspections must be conducted prior to re-commencing construction activities,
but no later than 72 hours following the storm event. The delay of any post-storm
event inspection must be documented in the inspection record. Routine inspections
must still be conducted at least every 14 calendar days.
Inspections at Completed Sites/Areas
When the site, or portions of a site are awaiting establishment of a vegetative ground
cover and final stabilization, the permittee must conduct a thorough inspection of the
stormwater management system at least once every 30 days. Post-storm event
inspections are not required under this schedule. This reduced inspection schedule is
allowed if all of the following criteria are met:
i. all construction activities resulting in ground disturbance are complete;
ii. all activities required for final stabilization, in accordance with the SWMP, have
been completed, with the exception of the application of seed that has not
occurred due to seasonal conditions or the necessity for additional seed application
to augment previous efforts; and
iii. the SWMP has been amended to locate those areas to be inspected in accordance
with the reduced schedule allowed for in this paragraph.
Winter Conditions Inspections Exclusion
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Inspections are not required for sites that meet all of the following conditions:
construction activities are temporarily halted, snow cover exists over the entire site
for an extended period, and melting conditions posing a risk of surface erosion do not
exist. This inspection exception is applicable only during the period where melting
conditions do not exist, and applies to the routine 7-day, 14-day and monthly
inspections, as well as the post-storm-event inspections. When this inspection
exclusion is implemented, the following information must be documented in
accordance with the requirements in Part II:
i. dates when snow cover existed;
ii. date when construction activities ceased; and
iii. date melting conditions began.
Inspection Scope
Areas to be Inspected
When conducting a site inspection the following areas, if applicable, must be
inspected for evidence of, or the potential for, pollutants leaving the construction site
boundaries, entering the stormwater drainage system, or discharging to state waters:
i. construction site perimeter;
ii. all disturbed areas;
iii. designated haul routes;
iv. material and waste storage areas exposed to precipitation;
v. locations where stormwater has the potential to discharge offsite; and
vi. locations where vehicles exit the site.
Inspection Requirements
i. Visually verify whether all implemented control measures are in effective
operational condition and are working as designed in their specifications to
minimize pollutant discharges.
ii. Determine if there are new potential sources of pollutants.
iii. Assess the adequacy of control measures at the site to identify areas requiring new
or modified control measures to minimize pollutant discharges.
iv. Identify all areas of non–compliance with the permit requirements and, if
necessary, implement corrective action in accordance with Part IB.1.c.
Inspection Reports
The permittee must keep a record of all inspections conducted for each permitted
site. Inspection reports must identify any incidents of noncompliance with the terms
and conditions of this permit. Inspection records must be retained in accordance with
Part II.O. and signed in accordance with Part I.A.3.f. At a minimum, the inspection
report must include:
i. the inspection date;
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ii. name(s) and title(s) of personnel conducting the inspection;
iii. weather conditions at the time of inspection;
iv. phase of construction at the time of inspection;
v. estimated acreage of disturbance at the time of inspection
vi. location(s) of discharges of sediment or other pollutants from the site;
vii. location(s) of control measures needing maintenance;
viii. location(s) and identification of inadequate control measures;
ix. location(s) and identification of additional control measures are needed that were
not in place at the time of inspection;
x. description of the minimum inspection frequency (either in accordance with Part
I.D.2., I.D.3. or I.D.4.) utilized when conducting each inspection.
xi. deviations from the minimum inspection schedule as required in Part I.D.2.;
xii. after adequate corrective action(s) and maintenance have been taken, or where a
report does not identify any incidents requiring corrective action or maintenance,
the report shall contain a statement as required in Part I.A.3.f.
DEFINITIONS
For the purposes of this permit:
(1) Bypass - the intentional diversion of waste streams from any portion of a treatment facility in
accordance with 40 CFR 122.41(m)(1)(i) and Regulation 61.2(12).
(2) Common Plan of Development or Sale - A contiguous area where multiple separate and distinct
construction activities may be taking place at different times on different schedules, but remain
related. The Division has determined that “contiguous” means construction activities located in
close proximity to each other (within ¼ mile). Construction activities are considered to be
“related” if they share the same development plan, builder or contractor, equipment, storage
areas, etc. “Common plan of development or sale” includes construction activities that are
associated with the construction of field wide oil and gas permits for facilities that are related.
(3) Construction Activity - Ground surface disturbing and associated activities (land disturbance),
which include, but are not limited to, clearing, grading, excavation, demolition, installation of new
or improved haul roads and access roads, staging areas, stockpiling of fill materials, and borrow
areas. Construction does not include routine maintenance to maintain the original line and grade,
hydraulic capacity, or original purpose of the facility. Activities to conduct repairs that are not part
of routine maintenance or for replacement are construction activities and are not routine
maintenance. Repaving activities where underlying and/or surrounding soil is exposed as part of
the repaving operation are considered construction activities. Construction activity is from initial
ground breaking to final stabilization regardless of ownership of the construction activities.
(4) Control Measure - Any best management practice or other method used to prevent or reduce the
discharge of pollutants to state waters. Control measures include, but are not limited to, best
management practices. Control measures can include other methods such as the installation,
operation, and maintenance of structural controls and treatment devices.
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(5) Control Measure Requiring Routine Maintenance - Any control measure that is still operating in
accordance with its design and the requirements of this permit, but requires maintenance to
prevent a breach of the control measure. See also inadequate control measure.
(6) Dedicated Asphalt, Concrete Batch Plants and Masonry Mixing Stations – are batch plants or mixing
stations located on, or within ¼ mile of, a construction site and that provide materials only to that
specific construction site.
(7) Final Stabilization - The condition reached when all ground surface disturbing activities at the site
have been completed, and for all areas of ground surface disturbing activities where a uniform
vegetative cover has been established with an individual plant density of at least 70 percent of pre-
disturbance levels, or equivalent permanent, physical erosion reduction methods have been
employed.
(8) Good Engineering, Hydrologic and Pollution Control Practices: are methods, procedures, and
practices that:
a. Are based on basic scientific fact(s).
b. Reflect best industry practices and standards.
c. Are appropriate for the conditions and pollutant sources.
d. Provide appropriate solutions to meet the associated permit requirements, including practice
based effluent limits.
(9) Inadequate Control Measure - Any control measure that is not designed or implemented in
accordance with the requirements of the permit and/or any control measure that is not
implemented to operate in accordance with its design. See also Control Measure Requiring Routine
Maintenance.
(10) Infeasible – Not technologically possible, or not economically practicable and achievable in light of
best industry practices.
(11) Minimize - reduce or eliminate to the extent achievable using control measures that are
technologically available and economically practicable and achievable in light of best industry
practice.
(12) Municipality - A city, town, county, district, association, or other public body created by, or under,
State law and having jurisdiction over disposal of sewage, industrial wastes, or other wastes, or a
designated and approved management agency under section 208 of CWA (1987).
(13) Municipal Separate Storm Sewer System (MS4) - A conveyance or system of conveyances (including
roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made
channels, or storm drains):
a) owned or operated by a State, city, town, county, district, association, or other public body
(created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial
wastes, stormwater, or other wastes, including special districts under State law such as a
sewer district, flood control district or drainage district, or similar entity, or a designated and
approved management agency under section 208 of the CWA that discharges to state waters;
i. designed or used for collecting or conveying stormwater;
ii. are not a combined sewer; and
iii. are not part of a Publicly Owned Treatment Works (POTW). See 5 CCR 1002-61.2(62).
(14) Municipal Stormwater Management Program - A stormwater program operated by a municipality,
typically to meet the requirements of the municipalities MS4 discharge certification.
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(15) Operator - The party that has operational control over day-to-day activities at a project site which
are necessary to ensure compliance with the permit. This party is authorized to direct individuals
at a site to carry out activities required by the permit.(e.g. the general contractor)
(16) Owner - The party that has overall control of the activities and that has funded the implementation
of the construction plans and specifications. This is the party with ownership of, a long term lease
of, or easements on the property on which the construction activity is occurring (e.g., the
developer).
(17) Permittee(s) - The owner and operator named in the discharge certification issued under this
permit for the construction site specified in the certification.
(18) Point Source - Any discernible, confined, and discrete conveyance, including, but not limited to,
any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock,
concentrated animal feeding operation, or vessel or other floating craft, from which pollutants are
or may be discharged. Point source does not include irrigation return flow. See 5 CCR 102-61.2(75).
(19) Pollutant - Dredged spoil, dirt, slurry, solid waste, incinerator residue, sewage, sewage sludge,
garbage, trash, chemical waste, biological nutrient, biological material, radioactive material, heat,
wrecked or discarded equipment, rock, sand, or any industrial, municipal or agricultural waste. See
5 CCR 1002-61.2(76).
(20) Presentation of credentials – a government issued form of identification, if in person; or (ii)
providing name, position and purpose of inspection if request to enter is made via telephone, email
or other form of electronic communication. A Permittee’s non-response to a request to enter upon
presentation of credentials constitutes a denial to such request, and may result in violation of the
Permit.
(21) Process Water - Any water which, during manufacturing or processing, comes into contact with or
results from the production of any raw material, intermediate product, finished product, by
product or waste product.
(22) Public Emergency Related Site - a project initiated in response to an unanticipated emergency
(e.g., mud slides, earthquake, extreme flooding conditions, disruption in essential public services),
for which the related work requires immediate authorization to avoid imminent endangerment to
human health or the environment, or to reestablish essential public services.
(23) Qualified Stormwater Manager - An individual knowledgeable in the principles and practices of
erosion and sediment control and pollution prevention, and with the skills to assess conditions at
construction sites that could impact stormwater quality and to assess the effectiveness of
stormwater controls implemented to meet the requirements of this permit.
(24) Qualifying Local Program - A municipal program for stormwater discharges associated with small
construction activity that was formally approved by the division as a qualifying local program.
(25) Receiving Water - Any classified or unclassified surface water segment (including tributaries) in the
State of Colorado into which stormwater associated with construction activities discharges. This
definition includes all water courses, even if they are usually dry, such as borrow ditches, arroyos,
and other unnamed waterways.
(26) Severe Property Damage - substantial physical damage to property, damage to the treatment
facilities which causes them to become inoperable, or substantial and permanent loss of natural
resources which can reasonably be expected to occur in the absence of a bypass. Severe property
damage does not mean economic loss caused by delays in production. See 40 CFR 122.41(m)(1)(ii).
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(27) Significant Materials - Include, but not limited to, raw materials; fuels; materials such as solvents,
detergents, and plastic pellets; finished materials such as metallic products; raw materials used in
food processing or production; hazardous substances designated under section 101(14) of CERCLA;
any chemical the permittee is required to report under section 313 of Title III of the Superfund
Amendments and Reauthorization Act (SARA); fertilizers; pesticides; and waste products such as
ashes, slag and sludge that have the potential to be released with stormwater discharges.
(28) Small Construction Activity - The discharge of stormwater from construction activities that result in
land disturbance of equal to, or greater than, one acre and less than five acres. Small construction
activity also includes the disturbance of less than one acre of total land area that is part of a larger
common plan of development or sale, if the larger common plan ultimately disturbs equal to, or
greater than, one acre and less than five acres.
(29) Spill - An unintentional release of solid or liquid material which may pollute state waters.
(30) State Waters - means any and all surface and subsurface waters which are contained in or flow in
or through this state, but does not include waters in sewage systems, waters in treatment works of
disposal systems, waters in potable water distribution systems, and all water withdrawn for use
until use and treatment have been completed.
(31) Steep Slopes: where a local government, or industry technical manual (e.g., stormwater BMP
manual) has defined what is to be considered a “steep slope”, this permit’s definition
automatically adopts that definition. Where no such definition exists, steep slopes are
automatically defined as those that are 3:1 or greater.
(32) Stormwater - Precipitation runoff, snow melt runoff, and surface runoff and drainage. See 5 CCR
1002-61.2(103).
(33) Total Maximum Daily Loads (TMDLs) -The sum of the individual wasteload allocations (WLA) for
point sources and load allocations (LA) for nonpoint sources and natural background. For the
purposes of this permit, a TMDL is a calculation of the maximum amount of a pollutant that a
waterbody can receive and still meet water quality standards, and an allocation of that amount to
the pollutant's sources. A TMDL includes WLAs, LAs, and must include a margin of safety (MOS), and
account for seasonal variations. See section 303(d) of the CWA and 40 C.F.R. 130.2 and 130.7.
(34) Upset - an exceptional incident in which there is unintentional and temporary noncompliance with
permit effluent limitations because of factors beyond the reasonable control of the permittee. An
upset does not include noncompliance to the extent caused by operational error, improperly
designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance,
or careless or improper operation in accordance with 40 CFR 122.41(n) and Regulation 61.2(114).
MONITORING
The division may require sampling and testing, on a case-by-case basis. If the division requires
sampling and testing, the division will send a notification to the permittee. Reporting
procedures for any monitoring data collected will be included in the notification.
If monitoring is required, the following applies:
1. the thirty (30) day average must be determined by the arithmetic mean of all samples
collected during a thirty (30) consecutive-day period; and
2. a grab sample, for monitoring requirements, is a single “dip and take” sample.
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Oil and Gas Construction
Stormwater discharges associated with construction activities directly related to oil and gas
exploration, production, processing, and treatment operations or transmission facilities are
regulated under the Colorado Discharge Permit System Regulations (5 CCR 1002-61), and
require coverage under this permit in accordance with that regulation. However, references
in this permit to specific authority under the CWA do not apply to stormwater discharges
associated with these oil and gas related construction activities, to the extent that the
references are limited by the federal Energy Policy Act of 2005.
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Part II: Standard Permit Conditions
DUTY TO COMPLY
The permittee must comply with all conditions of this permit. Any permit noncompliance
constitutes a violation of the Water Quality Control Act and is grounds for:
enforcement action;
permit termination, revocation and reissuance, or modification; or
denial of a permit renewal application.
DUTY TO REAPPLY
If the permittee wishes to continue an activity regulated by this permit after the expiration
date of this permit, the permittee must apply for and obtain authorization as required by Part
I.A.3.k. of the permit.
NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE
It shall not be a defense for a permittee in an enforcement action that it would have been
necessary to halt or reduce the permitted activity in order to maintain compliance with the
conditions of this permit.
DUTY TO MITIGATE
A permittee must take all reasonable steps to minimize or prevent any discharge in violation
of this permit which has a reasonable likelihood of adversely affecting human health or the
environment.
PROPER OPERATION AND MAINTENANCE
A permittee must at all times properly operate and maintain all facilities and systems of
treatment and control (and related appurtenances) that are installed or used by the
permittee to achieve compliance with the conditions of this permit. Proper operation and
maintenance also includes adequate laboratory controls and appropriate quality assurance
procedures. This provision requires the operation of backup or auxiliary facilities or similar
systems which are installed by the permittee only when the operation is necessary to achieve
compliance with the conditions of this permit. This requirement can be met by meeting the
requirements for Part I.B., I.C., and I.D. above. See also 40 C.F.R. § 122.41(e).
PERMIT ACTIONS
This permit may be modified, revoked and reissued, or terminated for cause. The permittee
request for a permit modification, revocation and reissuance, or termination, or a notification
of planned changes or anticipated noncompliance does not stay any permit condition. Any
request for modification, revocation, reissuance, or termination under this permit must
comply with all terms and conditions of Regulation 61.8(8).
PROPERTY RIGHTS
In accordance with 40 CFR 122.41(g) and 5 CCR 1002-61, 61.8(9):
1. The issuance of a permit does not convey any property or water rights in either real or
personal property, or stream flows or any exclusive privilege.
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2. The issuance of a permit does not authorize any injury to person or property or any
invasion of personal rights, nor does it authorize the infringement of federal, state, or
local laws or regulations.
3. Except for any toxic effluent standard or prohibition imposed under Section 307 of the
Federal act or any standard for sewage sludge use or disposal under Section 405(d) of the
Federal act, compliance with a permit during its term constitutes compliance, for
purposes of enforcement, with Sections 301, 302, 306, 318, 403, and 405(a) and (b) of the
Federal act. However, a permit may be modified, revoked and reissued, or terminated
during its term for cause as set forth in Section 61.8(8) of the Colorado Discharge Permit
System Regulations.
DUTY TO PROVIDE INFORMATION
The permittee shall furnish to the division, within a reasonable time, any information which
the division may request to determine whether cause exists for modifying, revoking and
reissuing, or terminating this permit, or to determine compliance with this permit. The
permittee shall also furnish to the division, upon request, copies of records required to be
kept by this permit in accordance with 40 CFR 122.41(h) and/or Regulation 61.8(3)(q).
INSPECTION AND ENTRY
The permittee shall allow the division and the authorized representative, upon the
presentation of credentials as required by law, to allow for inspections to be conducted in
accordance with 40 CFR 122.41(i), Regulation 61.8(3), and Regulation 61.8(4):
1. to enter upon the permittee's premises where a regulated facility or activity is located or
in which any records are required to be kept under the terms and conditions of this
permit;
2. at reasonable times to have access to and copy any records required to be kept under the
terms and conditions of this permit;
3. at reasonable times, inspect any monitoring equipment or monitoring method required in
the permit; and
4. to enter upon the permittee's premises in a reasonable manner and at a reasonable time
to inspect or investigate, any actual, suspected, or potential source of water pollution, or
any violation of the Colorado Water Quality Control Act. The investigation may include:
sampling of any discharges, stormwater or process water, taking of photographs,
interviewing site staff on alleged violations and other matters related to the permit, and
assessing any and all facilities or areas within the site that may affect discharges, the
permit, or an alleged violation.
The permittee shall provide access to the division or other authorized representatives upon
presentation of proper credentials. A permittee’s non-response to a request to enter upon
presentation of credentials constitutes a denial of such request, and may result in a
violation of the permit.
MONITORING AND RECORDS
1. Samples and measurements taken for the purpose of monitoring must be representative of
the volume and nature of the monitored activity.
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2. The permittee must retain records of all monitoring information, including all calibration
and maintenance records and all original strip chart recordings for continuous monitoring
instrumentation, copies of all reports required by this permit, and records of all data used
to complete the application for this permit, for a period of at least three years from the
date the permit expires or the date the permittee’s authorization is terminated. This
period may be extended by request of the division at any time.
3. Records of monitoring information must include:
a. The date, exact place, and time of sampling or measurements;
b. The individual(s) who performed the sampling or measurements;
c. The date(s) analyses were performed
d. The individual(s) who performed the analyses;
e. The analytical techniques or methods used; and
f. The results of such analyses.
4. Monitoring must be conducted according to test procedures approved under 40 CFR Part
136, unless other test procedures have been specified in the permit.
SIGNATORY REQUIREMENTS
Authorization to Sign:
All documents required to be submitted to the division by the permit must be signed in
accordance with the following criteria:
For a corporation: By a responsible corporate officer. For the purpose of this
subsection, a responsible corporate officer means:
i. a president, secretary, treasurer, or vice president of the corporation in charge of
a principal business function, or any other person who performs similar policy- or
decision-making functions for the corporation, or
ii. the manager of one or more manufacturing, production, or operating facilities,
provided, the manager is authorized to make management decisions which govern
the operation of the regulated facility including having the explicit or implicit duty
of making major capital investment recommendations, and initiating and directing
other comprehensive measures to assure long term environmental compliance with
environmental laws and regulations; the manager can ensure that the necessary
systems are established or actions taken to gather complete and accurate
information for permit application requirements; and where authority to sign
documents has been assigned or delegated to the manager in accordance with
corporate procedures.
For a partnership or sole proprietorship: By a general partner or the proprietor,
respectively; or
For a municipality, state, federal, or other public agency: By either a principal
executive officer or ranking elected official. For purposes of this subsection, a
principal executive officer of a federal agency includes
i. (i) the chief executive officer of the agency, or
PART II
Permit No.: COR400000
Page 25 of 33
ii. (ii) a senior executive officer having responsibility for the overall operations of a
principal geographic unit of the agency. (e.g., Regional Administrator of EPA)
Electronic Signatures
For persons signing applications for coverage under this permit electronically, in
addition to meeting other applicable requirements stated above, such signatures must
meet the same signature, authentication, and identity-proofing standards set forth at
40 CFR § 3.2000(b) for electronic reports (including robust second-factor
authentication). Compliance with this requirement can be achieved by submitting the
application using the Colorado Environmental Online Service (CEOS) system.
Change in Authorization to Sign
If an authorization is no longer accurate because a different individual or position has
responsibility for the overall operation of the facility, a new authorization must be
submitted to the division, prior to the re-authorization, or together with any reports,
information, or applications to be signed by an authorized representative.
REPORTING REQUIREMENTS
Planned Changes
The permittee shall give advance notice to the division, in writing, of any planned
physical alterations or additions to the permitted facility in accordance with 40 CFR
122.41(l) and Regulation 61.8(5)(a). Notice is required only when:
The alteration or addition to a permitted facility may meet one of the criteria for
determining whether a facility is a new source in 40 CFR 122.29(b); or
The alteration or addition could significantly change the nature or increase the
quantity of pollutants discharged. This notification applies to pollutants which are
subject neither to effluent limitations in the permit, nor to notification requirements
under 40 CFR 122.41(a)(1).
Anticipated Non-Compliance
The permittee shall give advance notice to the division, in writing, of any planned
changes in the permitted facility or activity that may result in noncompliance with
permit requirements. The timing of notification requirements differs based on the type
of non-compliance as described in subparagraphs 5, 6, 7, and 8 below.
Transfer of Ownership or Control
The permittee shall notify the division, in writing, ten (10) calendar days in advance of a
proposed transfer of the permit. This permit is not transferable to any person except
after notice is given to the division.
PART II
Permit No.: COR400000
Page 26 of 33
Where a facility wants to change the name of the permittee, the original permittee
(the first owner or operators) must submit a Notice of Termination.
The new owner or operator must submit an application. See also signature
requirements in Part II.K, above.
A permit may be automatically transferred to a new permittee if:
i. The current permittee notifies the Division in writing 30 calendar days in advance
of the proposed transfer date; and
ii. The notice includes a written agreement between the existing and new
permittee(s) containing a specific date for transfer of permit responsibility,
coverage and liability between them; and
iii. The division does not notify the existing permittee and the proposed new
permittee of its intent to modify, or revoke and reissue the permit.
iv. Fee requirements of the Colorado Discharge Permit System Regulations, Section
61.15, have been met.
Monitoring reports
Monitoring results must be reported at the intervals specified in this permit per the
requirements of 40 CFR 122.41(l)(4).
Compliance Schedules
Reports of compliance or noncompliance with, or any progress reports on, interim and
final requirements contained in any compliance schedule in the permit, shall be
submitted on the date listed in the compliance schedule section. The fourteen (14)
calendar day provision in Regulation 61.8(4)(n)(i) has been incorporated into the due
date.
Twenty-four hour reporting
In addition to the reports required elsewhere in this permit, the permittee shall report
the following circumstances orally within twenty-four (24) hours from the time the
permittee becomes aware of the circumstances, and shall mail to the division a written
report containing the information requested within five (5) working days after becoming
aware of the following circumstances:
Circumstances leading to any noncompliance which may endanger health or the
environment regardless of the cause of the incident;
Circumstances leading to any unanticipated bypass which exceeds any effluent
limitations in the permit;
Circumstances leading to any upset which causes an exceedance of any effluent
limitation in the permit;
PART II
Permit No.: COR400000
Page 27 of 33
Daily maximum violations for any of the pollutants limited by Part I of this permit.
This includes any toxic pollutant or hazardous substance or any pollutant specifically
identified as the method to control any toxic pollutant or hazardous substance.
The division may waive the written report required under subparagraph 6 of this
section if the oral report has been received within 24 hours.
Other non-compliance
A permittee must report all instances of noncompliance at the time monitoring reports
are due. If no monitoring reports are required, these reports are due at least annually
in accordance with Regulation 61.8(4)(p). The annual report must contain all instances
of non-compliance required under either subparagraph 5 or subparagraph 6 of this
subsection.
Other information
Where a permittee becomes aware that it failed to submit any relevant facts in a permit
application, or submitted incorrect information in a permit application, or in any report
to the Permitting Authority, it has a duty to promptly submit such facts or information.
BYPASS
Bypass not exceeding limitations
The permittees may allow any bypass to occur which does not cause effluent limitations
to be exceeded, but only if it also is for essential maintenance to assure efficient
operation. These bypasses are not subject to the provisions of Part II.M.2 of this permit.
See 40 CFR 122.41(m)(2).
Notice of bypass
Anticipated bypass. If the permittee knows in advance of the need for a bypass, the
permittee must submit prior notice, if possible at least ten days before the date of
the bypass. ee 40 CFR §122.41(m)(3)(i) and/or Regulation 61.9(5)(c).
Unanticipated bypass. The permittee must submit notice of an unanticipated bypass
in accordance with Part II.L.6. See 40 CFR §122.41(m)(3)(ii) .
Prohibition of Bypass
Bypasses are prohibited and the division may take enforcement action against the
permittee for bypass, unless:
i. the bypass is unavoidable to prevent loss of life, personal injury, or severe
property damage;
PART II
Permit No.: COR400000
Page 28 of 33
ii. There were no feasible alternatives to the bypass, such as the use of auxiliary
treatment facilities, retention of untreated wastes, or maintenance during normal
periods of equipment downtime. This condition is not satisfied if adequate backup
equipment should have been installed in the exercise of reasonable engineering
judgment to prevent a bypass which occurred during normal periods of equipment
downtime or preventive maintenance; and
iii. proper notices were submitted to the division.
UPSET
Effect of an upset
An upset constitutes an affirmative defense to an action brought for noncompliance with
permit effluent limitations if the requirements of Part II.N.2. of this permit are met. No
determination made during administrative review of claims that noncompliance was
caused by upset, and before an action for noncompliance, is final administrative action
subject to judicial review in accordance with Regulation 61.8(3)(j).
Conditions necessary for demonstration of an Upset
A permittee who wishes to establish the affirmative defense of upset shall demonstrate
through properly signed contemporaneous operating logs, or other relevant evidence
that
an upset occurred and the permittee can identify the specific cause(s) of the upset;
the permitted facility was at the time being properly operated and maintained; and
the permittee submitted proper notice of the upset as required in Part II.L.6.(24-
hour notice); and
the permittee complied with any remedial measure necessary to minimize or
prevent any discharge or sludge use or disposal in violation of this permit which has
a reasonable likelihood of adversely affecting human health or the environment. In
addition to the demonstration required above, a permittee who wishes to establish
the affirmative defense of upset for a violation of effluent limitations based upon
water quality standards shall also demonstrate through monitoring, modeling or
other methods that the relevant standards were achieved in the receiving water.
Burden of Proof
In any enforcement proceeding, the permittee seeking to establish the occurrence of an
upset has the burden of proof.
RETENTION OF RECORDS
Post-Expiration or Termination Retention
Copies of documentation required by this permit, including records of all data used to
complete the application for permit coverage to be covered by this permit, must be
PART II
Permit No.: COR400000
Page 29 of 33
retained for at least three years from the date that permit coverage expires or is
terminated. This period may be extended by request of EPA at any time.
On-site Retention
The permittee must retain an electronic version or hardcopy of the SWMP at the
construction site from the date of the initiation of construction activities to the date of
expiration or inactivation of permit coverage; unless another location, specified by the
permittee, is approved by the division.
REOPENER CLAUSE
Procedures for modification or revocation
Permit modification or revocation of this permit or coverage under this permit will be
conducted according to Regulation 61.8(8).
Water quality protection
If there is evidence indicating that the stormwater discharges authorized by this permit
cause, have the reasonable potential to cause or contribute to an excursion above any
applicable water quality standard, the permittee may be required to obtain an individual
permit, or the permit may be modified to include different limitations and/or
requirements.
SEVERABILITY
The provisions of this permit are severable. If any provisions or the application of any
provision of this permit to any circumstances, is held invalid, the application of such provision
to other circumstances and the application of the remainder of this permit shall not be
affected.
NOTIFICATION REQUIREMENTS
Notification to Parties
All notification requirements, excluding information submitted using the CEOS portal,
shall be directed as follows:
Oral Notifications, during normal business hours shall be to:
Clean Water Compliance Section
Water Quality Control Division
Telephone: (303) 692-3500
Written notification shall be to:
Clean Water Compliance Section
Water Quality Control Division
Colorado Department of Public Health and Environment
WQCD-WQP-B2
4300 Cherry Creek Drive South
Denver, CO 80246-1530
PART II
Permit No.: COR400000
Page 30 of 33
RESPONSIBILITIES
Reduction, Loss, or Failure of Treatment Facility
The permittee has the duty to halt or reduce any activity if necessary to maintain
compliance with the effluent limitations of the permit. It shall not be a defense for a
permittee in an enforcement action that it would be necessary to halt or reduce the
permitted activity in order to maintain compliance with the conditions of this permit.
Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or
relieve the permittee from any responsibilities, liabilities, or penalties to which the
permittee is or may be subject to under Section 311 (Oil and Hazardous Substance Liability) of
the CWA.
Emergency Powers
Nothing in this permit shall be construed to prevent or limit application of any emergency
power of the division.
Confidentiality
Any information relating to any secret process, method of manufacture or production, or sales
or marketing data which has been declared confidential by the permittee, and which may be
acquired, ascertained, or discovered, whether in any sampling investigation, emergency
investigation, or otherwise, shall not be publicly disclosed by any member, officer, or
employee of the Water Quality Control Commission or the division, but shall be kept
confidential. Any person seeking to invoke the protection of of this section shall bear the
burden of proving its applicability. This section shall never be interpreted as preventing full
disclosure of effluent data.
Fees
The permittee is required to submit payment of an annual fee as set forth in the 2016
amendments to the Water Quality Control Act. Section 25-8-502 (1.1) (b), and the Colorado
Discharge Permit System Regulations 5 CCR 1002-61, Section 61.15 as amended. Failure to
submit the required fee when due and payable is a violation of the permit and will result in
enforcement action pursuant to Section 25-8-601 et. seq., C.R.S.1973 as amended.
Duration of Permit
The duration of a permit shall be for a fixed term and shall not exceed five (5) years. If the
permittee desires to continue to discharge, a permit renewal application shall be submitted
at least ninety (90) calendar days before this permit expires. Filing of a timely and complete
application shall cause the expired permit to continue in force to the effective date of the
new permit. The permit's duration may be extended only through administrative extensions
and not through interim modifications. If the permittee anticipates there will be no discharge
after the expiration date of this permit, the division should be promptly notified so that it can
terminate the permit in accordance with Part I.A.3.i.
Section 307 Toxics
If a toxic effluent standard or prohibition, including any applicable schedule of compliance
specified, is established by regulation pursuant to Section 307 of the Federal Act for a toxic
pollutant which is present in the permittee's discharge and such standard or prohibition is
more stringent than any limitation upon such pollutant in the discharge permit, the division
PART II
Permit No.: COR400000
Page 31 of 33
shall institute proceedings to modify or revoke and reissue the permit to conform to the toxic
effluent standard or prohibition
CDPS GENERAL PERMIT
CONSTRUCTION DEWATERING DISCHARGES
TO DISCHARGE UNDER THE COLORADODISCHARGE PERMIT SYSTEM
PERMIT NUMBER COG070000
In compliance with the provisions of the Colorado Water Quality Control Act, (25-8-101 et seq., CRS, 1973 as
amended) and the Federal Water Pollution Control Act, as amended (33 U.S.C. 1251 et seq.; the "Act"),
entities engaged in construction dewatering are authorized to discharge source water from authorized locations
throughout the State of Colorado to specified waters of the State. Such discharges shall be in accordance with
the conditions of this general permit.
This permit specifically authorizes the entity(s) listed on page 1 of this document (also known as the permit
certification) to discharge process generated wastewaters, as of the effective dates stated on page 1 of the
certification, in accordance with the permit requirements and conditions set forth in Parts I and II hereof. All
discharges authorized herein shall be consistent with the terms and conditions of this permit.
The applicant may demand an adjudicatory hearing within thirty (30) days of the date of issuance of the final
permit determination, per the Colorado Discharge Permit System Regulations, 61.7(1). Should the applicant
choose to contest any of the effluent limitations, monitoring requirements or other conditions contained herein,
the applicant must comply with Section 24-4-104 CRS and the Colorado Discharge Permit System
Regulations. Failure to contest any such effluent limitation, monitoring requirement, or other condition,
constitutes consent to the condition by the Applicant.
This permit and the authorization to discharge shall expire at midnight AUGUST 31, 2018
Modified and signed this 24th day of July, 2014.
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Janet Kieler, Permits
Section Manager
WATER QUALITY CONTROL
DIVISION
Permit Action Summary:
Minor Modification #2 – Issued July 24. 2014, Effective July 24, 2014: Part I.C.1.b
Minor Modification #1—Issued May 16, 2014, Effective May 16, 2014: Part I.E.1; Table B.1
Originally Issued and Signed: July 22, 2013, Effective September 1, 2013
Page 3 of 32
Permit No.:COG070000
Table of Contents
PART I ..................................................................................................................................................................................... 5
A. COVERAGE UNDER THIS PERMIT ............................................................................................................................... 5
1. Activities Covered .................................................................................................................................................... 5
2. Limitations on Coverage .......................................................................................................................................... 5
3. Application Requirements ........................................................................................................................................ 6
4. Terminating Coverage .............................................................................................................................................. 7
5. Modifying Existing Permit Coverage ....................................................................................................................... 7
B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS .......................................................................... 7
1. Permitted Outfall(s) .................................................................................................................................................. 7
2. Numeric Effluent Limitations, Monitoring Frequencies, and Sample Types ........................................................... 7
C. TERMS AND CONDITIONS ........................................................................................................................................... 11
1. Discharge Log ........................................................................................................................................................ 11
2. Practice Based Requirements ................................................................................................................................. 11
3. Practices for Discharges in Exceedance of Applicable Water Quality Standards .................................................. 11
4. Chemical Additions ................................................................................................................................................ 12
4. Discharge Point ...................................................................................................................................................... 12
5. Discharges to Conveyances .................................................................................................................................... 12
6. Mixing Zone ........................................................................................................................................................... 12
7. Discharges to Waters with Total Maximum Daily Loads (TMDLs) ...................................................................... 13
8. Discharges to 303(d) Listed Waters ....................................................................................................................... 13
D. DEFINITIONS OF TERMS ............................................................................................................................................. 13
E. GENERAL MONITORING, SAMPLING AND REPORTING REQUIREMENTS ........................................................ 17
1. Routine Reporting of Data ..................................................................................................................................... 17
2. Reporting for Undefined Outfalls........................................................................................................................... 18
3. Representative Sampling ........................................................................................................................................ 18
4. Analytical and Sampling Methods for Monitoring and Reporting......................................................................... 18
5. Records .................................................................................................................................................................. 20
6. Additional Monitoring by Permittee ...................................................................................................................... 21
7. Flow Measuring Device ........................................................................................................................................ 21
8. Signatory and Certification Requirements ............................................................................................................ 21
Part II ...................................................................................................................................................................................... 23
A. NOTIFICATIONREQUIREMNTS ................................................................................................................................... 23
1. Notification to Parties ............................................................................................................................................ 23
2. Change in Discharge or Wastewater Treatment ..................................................................................................... 23
3. Special Notifications Definitions ........................................................................................................................... 24
4. Noncompliance Notification .................................................................................................................................. 24
5. Other Notification Requirements ........................................................................................................................... 25
6. Bypass Notification ................................................................................................................................................ 25
7. Upsets .................................................................................................................................................................... 26
8. Discharge Point ...................................................................................................................................................... 26
9. Proper Operation and Maintenance ........................................................................................................................ 26
10. Minimization of Adverse Impact........................................................................................................................ 26
11. Removed Substances .......................................................................................................................................... 27
12. Submission of Incorrect or Incomplete Information .......................................................................................... 27
13. Bypass ................................................................................................................................................................ 27
14. Reduction, Loss, or Failure of Treatment Facility .............................................................................................. 27
B. RESPONSIBILITIES ......................................................................................................................................................... 28
1. Inspections and Right to Entry ............................................................................................................................... 28
2. Duty to Provide Information .................................................................................................................................. 28
3. Transfer of Ownership or Control .......................................................................................................................... 28
4. Availability of Reports ........................................................................................................................................... 29
5. Modification, Suspension, Revocation, or Termination of Permits By the Division ............................................. 29
6. Oil and Hazardous Substance Liability .................................................................................................................. 31
7. State Laws .............................................................................................................................................................. 31
8. Permit Violations .................................................................................................................................................... 31
9. Property Rights ....................................................................................................................................................... 32
10. Severability......................................................................................................................................................... 32
11. Renewal Application .......................................................................................................................................... 32
12. Confidentiality .................................................................................................................................................... 32
13. Fees ..................................................................................................................................................................... 32
14. Duration of Permit .............................................................................................................................................. 32
15. Section 307 Toxics ............................................................................................................................................. 32
16. Effect of Permit Issuance ................................................................................................................................... 33
Page 5 of 34
Permit No.:COG070000
PART I
A. COVERAGE UNDER THIS PERMIT
1. Activities Covered
This permit authorizes the discharge of construction dewatering source water throughout the State of
Colorado to waters of the state. Construction dewatering source water means groundwater, surface water, and
stormwater that has mixed with the groundwater and/ or surface water (i.e. commingled stormwater runoff)
that has come into contact with Construction Activities. This permit only authorizes discharges for which
the source water is drawn from the specific area(s) identified in the application, or in subsequent
notification(s) in accordance with Part II.A.2 and II.B.5 of the permit.
2. Limitations on Coverage
All effluent limitations for this permit are applied at the point of discharge. Dilution (i.e., mixing zone)
considerations are not applicable in this permit.
A discharge that would meet any of the following conditions at the time of the effective date of the permit
authorization are not eligible for coverage under this permit and must apply for coverage under another
general permit or under an individual permit:
a. The Division has determined that there is a reasonable potential for a pollutant to be present in the source
water at a concentration that is greater than a numeric water quality standard of the receiving water.
Note that a numeric water quality standard does not exist for Total Suspended Solids, and therefore
permit coverage is available for discharges that require treatment to meet the Total Suspended Solid
limitation in this permit. The Division’s evaluation to identify potential pollutants will include, but is not
limited to:
• known areas of contamination at or near the facility (e.g., hazardous waste site, leaking
underground storage tanks, or additional sources other than what is normally encountered at
excavation and construction sites),
• naturally occurring pollutants that potentially exist in the source water, and
• pollutants that have the potential to be added to the source water prior to discharge.
An exception to this limitation will be allowed for discharges with a reasonable potential for Benzene,
Toluene, Ethylbenzene, and Xylene to be present in the source water at a concentration that is greater
than a numeric water quality standard of the receiving water when the applicant can demonstrate that the
construction dewatering source water does not have concentrations of these parameters that are greater
than the water quality standard of the receiving water.
A discharge subject to this limitation following the effective date of the permit authorization shall be
determined to be inconsistent with the conditions of the permit and the Division shall require a new or
revised permit application and shall follow the procedures specified in Sections 61.5 through 61.6, and
61.15 of the Colorado Discharge Permit System Regulations.
b. The discharge(s) is to a receiving water designated as “outstanding waters.”
c. Discharges to ground water only cannot be covered under this general permit if subject to regulation by
the EPA or by implementing agencies under Senate Bill 181. This exclusion does not apply to discharges
to surface waters, including discharges to groundwater that are tributary to surface waters and for which
the Division determines that the requirements of Regulation 61 applicable to surface waters apply.
Page 6 of 34
Permit No.:COG070000
Discharges that fall under the regulating authority of other agencies include:
i. Discharges to Class V Injection Wells—Discharges to Class V Injection Wells within the state of
Colorado are regulated by the Environmental Protection Agency (EPA), Region 8, through the
Underground Injection Control (UIC) program. In accordance with of Colorado Discharge Permit
System Regulations Section 61.14(1)(b)(vii), facilities operating under a permit issued pursuant to the
UIC provisions are specifically exempt from coverage under the ground water discharge provisions of
Regulation 61. A Class V Injection well is defined by EPA as any bored, drilled, or driven shaft, or
dug hole that is deeper than its widest surface dimension, or an improved sinkhole, or a subsurface
fluid distribution system.
ii. Discharges to Surface Impoundments or Other Engineered Units—Facilities discharging wastewaters
into surface impoundments and associated pipelines or other engineered units, even those designed for
purposeful seepage (e.g. no liner or a seeping liner) shall be regulated by the Hazardous Materials
Waste Management Division (HMWMD), Solid Waste Program.
3. Application Requirements
In order to apply for certification under this general permit, the applicant shall submit an application form as
provided by the Division by mail or hand delivery at least 30 days before the anticipated date of
discharge. The application in its entirety shall be submitted to:
Colorado Department of Public Health and Environment
Water Quality Control Division
Permits Section, WQCD-PCP-B2
4300 Cherry Creek Drive South
Denver, Colorado 80246-1530
Following review of the application, the Division may request additional information or deny the
authorization to discharge under this general permit. If the Division determines that a new facility does not
fall under the authority of the general permit, then the information received will be processed for an
individual permit or the applicant may apply for coverage under an alternative general permit, and the
applicant shall be notified of such a determination. If during the renewal process, the Division determines
that a facility no longer qualifies for the general permit, then the certification may be revoked or the facility
may be allowed to discharge under the general permit, with additional conditions in the amended
certification, until an individual permit or alternative general permit is issued.
A permittee desiring continued coverage under the general permit must reapply at least 180 days in
advance of this permit expiration. If this permit is not reissued or replaced prior to the expiration date, it
will be administratively continued and remain in force and effect. If a permittee was authorized to discharge
under this permit prior to the expiration date, any discharges authorized under this permit will automatically
remain covered by this permit until the earliest of:
a. Authorization for coverage under a reissued permit or a replacement of this permit following the
timely and appropriate submittal of a complete application requesting authorization to discharge under
the new permit and compliance with the requirements of the application;
b. The issuance and effect of a termination issued by the Division;
c. The issuance or denial of an individual permit for the facility’s discharges;
d. A formal permit decision by the Division not to reissue this general permit, at which time the
Division will identify a reasonable time period for covered dischargers to seek coverage under an
Page 7 of 34
Permit No.:COG070000
alternative general permit or an individual permit. Coverage under this permit will cease when
coverage under another permit is granted/authorized; or
e. The Division has informed the permittee that they are no longer covered under this permit.
4 . Terminating Coverage
To terminate permit coverage, the legal permit applicant or duly authorized agent must submit a complete
and accurate Notice of Termination Form, to the address listed in Part I.A.3. The authorization to discharge
under this permit terminates at midnight of the day that the termination is effective as notified by the
Division. The permittee is responsible for meeting the terms of this permit until the authorization is
terminated. The Notice of Termination must be signed in accordance with Part I.E.8 of this permit.
5. Modifying Existing Permit Coverage
To modify an existing permit certification, the legal permit contact or duly authorized agent must submit a
complete and accurate Modification Form, to the address listed in Part I.A.3. This form must be submitted
to the Division at least 30 days prior to implementing any requested modifications that result in a discharge
to state waters. The permittee is not authorized to discharge under the modified conditions until the
modified certification is issued and effective. Modifications include but are not limited to: adding or
removing discharge outfalls, adding new or additional chemicals to the treatment process or effluent,
modifying treatment in a manner that would result in a new or altered discharge in terms of location or
effluent quality, etc. The modification form must be signed in accordance with Part I.E.8 of this permit.
B. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. Permitted Outfall(s)
Beginning no earlier than the effective date listed on the permit certification and lasting through the
expiration date of this permit, the permittee identified on the permit certification is authorized to
discharge from the Outfall(s) listed on the permit certification in accordance with the conditions and
limitations of this permit.
If requested in the permit application, the permit certification may identify an outfall as an undefined
outfall, and the location of the discharge outfall will not be identified on the permit certification. For all
undefined outfalls, the permittee must comply with the record keeping requirements in Part I.C.1.c
(Discharge Log), reporting requirements in Part I .E.2 (Reporting for Undefined Outfalls), and the outfall
location shall not be changed after a discharge has occurred except through a modification in accordance
with Part I.A.5.
In order to keep permit certifications, discharge monitoring reports, and administration manageable, the
Division is limiting the number of outfalls per permit certification to twenty (20). If the applicant has
reason to request more than twenty outfall locations the Division may grant more outfalls on a case-by-
case basis.
2. Numeric Effluent Limitations, Monitoring Frequencies, and Sample Types
In accordance with the Water Quality Control Commission Regulations for Effluent Limitations, Section
62.4, and the Colorado Discharge Permit System Regulations, Section 61.8(2), 5.C.C.R. 1002-61, the
permitted discharge shall not contain effluent parameter concentrations that exceed the limitations specified in
Table B.1 or B.2 below, as applicable to the outfall(s). For parameters for which the applicable note states
that the analysis or monitoring will be included in the permit certification based on meeting specific
Page 8 of 34
Permit No.:COG070000
conditions, limitations and monitoring requirements are only applicable if identified in the permit certification
for the specified outfall.
The permittee must monitor the effluent for all listed parameters at the frequency and sample types specified
in Table B.1 or B.2 below, as applicable to the outfall(s).
Report only monitoring requirements for additional site-specific parameters may be included in the permit
certification. Such additional monitoring may be required where this additional information will help the
Division verify whether any anticipated changes or additional uncertainties reveal data that more accurately
predicts actual effluent concentrations.
All required monitoring will begin immediately and last for the life of the permit unless otherwise noted. The
results of such monitoring must be reported on the Discharge Monitoring Report (DMR) form (See Part I.E).
Table B.1, Numeric Effluent Limitations and Monitoring Requirements for all Discharges to Surface Water
Parameter
ICIS Code
Note
(below)
Discharge Limitations Monitoring Conditions
30-Day
Average
7-Day
Average
Daily
Maximum
Monitoring
Frequency Sample Type
50050
Flow, gpm 1 ---- ---- Limitation in
Certification Weekly
Instantaneous or
Continuous
Recorder
00530
Total Suspended Solids, mg/l
30 45
--- Weekly Grab
84066
Oil and Grease 2
---- ----- --- Weekly Visual
03582
Oil and Grease, mg/l 2
---- ----- 10 Weekly Grab
00400
pH, s.u.
---- ----- 6.5-9.0 Weekly In-situ or Grab
70295
Total Dissolved Solids, mg/l 3 Report
----- Report Monthly Grab
00665
Total Phosphorus, mg/l, as P 4 Report
----- Report Monthly Grab
51040
E. Coli bacteria, per 100 ml 5 Limit in
Certification
Limit in
Certification
-----
Weekly Grab
34030 Benzene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
34010 Toluene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
37371 Ethylbenzene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
81551
Xylene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
Metals, Organics, Inorganics, Temperature, RADs
7 Report
----- Report Weekly Grab
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Permit No.:COG070000
Table B.2, Numeric Effluent Limitations and Monitoring Requirements for all Discharges to Ground Water
Parameter
ICIS Code
Note
(below)
Discharge Limitations Monitoring Conditions
30-Day
Average
7-Day
Average
Daily
Maximum
Monitoring
Frequency Sample Type
50050
Flow, gpm 1 ---- ---- Limitation in
Certification Weekly
Instantaneous
or Continuous
Recorder
84066
Oil and Grease 2
---- ----- -
-
Weekly Visual
03582
Oil and Grease, mg/l 2
---- ----- 10 Weekly Grab
00400
pH, s.u.
---- ----- 6.5-8.5 Weekly In-situ or Grab
70295
Total Dissolved Solids, mg/l 8 Limit in
Certification
----- Limit
in
Certification
Monthly Grab
00665
Total Phosphorus, mg/l, as P 4 Report
----- Report Monthly Grab
74056
Total Coliform, per 100 ml 5 2.2
23 Weekly Grab
34030 Benzene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
34010 Toluene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
37371 Ethylbenzene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
81551 Xylene, ug/l 6 Limit in
Certification
----- Limit in
Certification Weekly Grab
Metals, Organics, Inorganics,
Temperature, RADs 7 Report
----- Report Weekly Grab
Notes for Tables B.1 and B.2:
Note 1: Flow Limit— The acute flow limit will be equal to twice the maximum flow rate provided in
the permit application and will be stated on the certification. However, if the discharge flow
rate exceeds the maximum flow rate identified in the application, the permittee shall notify the
Division in accordance with Part II.A.2. of the Permit. The method for measuring flow rates
authorizes estimates.
Note 2: Oil and Grease—A visual observation of the discharge for each permitted outfall must be
made once a week. In the event an oil sheen or floating oil is observed, a composite sample
shall be collected weekly, analyzed, and reported on the DMR. In addition, corrective action
shall be taken immediately to mitigate the discharge of oil and grease. A description of the
corrective action taken must be included with the DMR.
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Permit No.:COG070000
Note 3: Total Dissolved Solids (TDS) – Surface Water Outfalls—Analysis for salinity, measured as
TDS, will be included in the permit certification for all discharges in the Colorado River
Basin. Following the submittal of the initial six sets of monthly data, the Division shall
determine whether the permittee is required to submit a report addressing salt removal in
accordance with the Colorado River Salinity Standards, Regulation No. (5CCR 1002-39). If
the salinity report is required, the Division shall so advise the permittee by letter or through
the inclusion of a compliance schedule and the report shall be submitted within 180 days.
Note 4: Total Phosphorus—Analysis for Total Phosphorus, as P, will be included in the permit
certification for all discharges to waters with a control regulation for P. In accordance with
the Dillon Reservoir Control Regulation (Regulation 71), monitoring for Total Phosphorus is
required. In accordance with the Cherry Creek Reservoir Control Regulation (Regulation 72),
monitoring and compliance with the Total Phosphorus chronic numeric effluent limit of
0.05mg/l is required. In accordance with the Chatfield Reservoir Control Regulation
(Regulation 73), monitoring and compliance with the Total Phosphorus chronic numeric
effluent limit of 1.0 mg/l is required. In accordance with the Bear Creek Watershed Control
Regulation (Regulation 74), monitoring for Total Phosphorus is required.
Note 5: E Coli and Total Coliform—Analysis and limitations for E. Coli and Total Coliform will be
included in the permit certification for discharges from construction dewatering operations
that involve replacing or repairing existing sanitary sewer lines, are in proximity to septic
disposal systems, or other sewage disposal conveyances or vessels, where the Division has
made a qualitative reasonable potential determination that E. coli or Total Coliform may be
present in the discharge. The E. coli effluent limitation will be applied for discharge to
surface water and will reflect the Recreational Class of the receiving stream of the discharge
(Class E at 126 per 100 ml, Class P at 205 per 100 ml, and Class N at 630 per 100ml). The
Total Coliform effluent limitation will be applied if the discharge is to groundwater. If the
construction dewatering operation is considered in-stream (for example, bank stabilization and
discharges back to the same water body), monitoring and reporting, or monitoring and
compliance with the numeric effluent limitation for E. coli or Total Coliform will not be
required.
Note 6: Benzene, Toluene, Ethylbenzene, and Xylene — Analysis and limitations for Benzene,
Toluene, Ethylbenzene, and Xylene will be included in the permit certification for
construction dewatering operations where the Division has made a qualitative reasonable
potential determination that Benzene, Toluene, Ethylbenzene, or Xylene may be present in the
discharge. See Part I A.2.a. of the permit regarding limitations of permit coverage associated
with Benzene, Toluene, Ethylbenzene, and Xylene.
If the construction dewatering operation is considered in-stream (for example bank
stabilization and discharges back to the same water body), monitoring and compliance with
the additional numeric effluent limitations will not be required.
Note 7: Metals, Organics, Inorganics, Temperature, and RADS—Analysis for additional parameters
may be added to the permit certification in accordance with Part I.B.2. If the construction dewatering operation is considered in-stream (for example bank
stabilization and discharges back to the same water body), monitoring for the additional
parameters will not be required.
Note 8: Total Dissolved Solids (TDS) – Ground Water Outfalls—Analysis for salinity, measured as
TDS, will be added to the permit certification for all discharges to a different aquifer from
which the ground water was pulled. If the discharge is to the same aquifer from which it was
pulled, sampling for TDS will not be required provided that the remediation activity is not
contributing to TDS concentrations.
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Permit No.:COG070000
C. TERMS AND CONDITIONS
1. Discharge Log
The permittee shall maintain a documented Discharge Log identifying the following information for each
permitted outfall:
a. the dates and times when a discharge commences and ends,
b. records for monitoring as required by Part I.E.5.
c. prior to the start of any discharge from an undefined discharge outfall(s) (see Part I.B.1), the receiving
water for the discharge and the location that the outfall will be located at, including the latitude and
longitude to the nearest 15 seconds, , general description of the location, and a map showing the discharge
locations.
d. a description of the pollutant control practices used during construction dewatering, including:
i. for all filter devices- document the pollutant control filter maximum flow rate that will maintain
compliance with the permit effluent limits and a drawing, sketch, and/or written description of the
installation and implementation specifications.
ii. for all settling devices- document the residence time and maximum flow rate that will maintain
compliance with the permit effluent limits and a drawing, sketch, and/or written description of the
installation and implementation specifications..
iii. for all other techniques and methods implemented to remove pollutants prior to discharge, such as but
not limited to pump in gravel-packs, sump conditions, and well screens- document the technique used
and its intended purpose, the maximum flow rate for operation that will maintain compliance with the
permit effluent limits, and a drawing, sketch, and/ or written description of the installation and
implementation specifications.
iv. if no treatment has been determined necessary to remove pollutants prior to discharge in order to
maintain compliance with the permit effluent limits- a statement identifying that no treatment will be
provided.
e. The method used to measure flow, in accordance with I.E.7.
The log must be updated within 72 hours of the occurrence of any activit y requiring documentation in
accordance with this subsection.
2. Practice Based Requirements
a. Pollutant Control Practices: The permittee shall implement pollutant control practices to meet the
effluent limitations contained in this permit. The pollutant control practices must be selected,
designed, installed, implemented and maintained in accordance with good engineering, hydrologic,
pollution control practices, and the manufacturer’s specifications including installation and
implementation specifications, where applicable. Practices may include treatment, schedules of
activities, prohibitions of practices, maintenance procedures, monitoring practices used to document
the capability of the treatment practices to remove pollutants, handling and disposal practices, and
other management practices necessary to meet the effluent limitations contained in this permit.
3. Practices for Discharges in Exceedance of Applicable Water Quality Standards
The Division expects that compliance with the effluent limits in this permit will control discharges as
necessary to meet applicable water quality standards. If at any time the permittee becomes aware that at the
permitted outfall, pollutant concentrations for an effluent parameter not subject to an effluent limitation in Part
I.B or the permit certification exceeds any applicable water quality standard for the receiving water, the
permittee shall:
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Permit No.:COG070000
a. Halt or reduce any activity if necessary to prevent the discharge of an effluent parameter(s), at the
permitted outfall, in concentrations which exceed the applicable water quality standards for the receiving
water; and
b. Mail a written report to the Division containing all relevant monitoring data and the information
consistent with that required for noncompliance in Part II.A.4 (a) within five (5) days after becoming
aware of the exceedance.
Coverage under this general permit may be modified, suspended, or terminated by the Division if necessary to
effectively implement protection of waters of the State. If the Division finds that such new or altered
discharge might be inconsistent with the conditions of the permit, the Division shall require a new or revised
permit application, or require coverage under an individual permit or alternative general permit, and shall
follow the procedures specified in Sections 61.5 through 61.6, and 61.15 of the Colorado Discharge Permit
System Regulations.
4. Chemical Additions
No chemicals are to be added that have the potential to be present in the permitted discharge, including, but
not limited to, chemical additions at any point in the treatment process, unless the permittee provides advance
notice to the Division of the planned changes in accordance with Part II.A.2 and the Division confirms that
the new or altered discharge is appropriate for coverage under this permit. The permit applicant must submit
a list of proposed chemicals, including dosage rates, used in the treatment process. Additionally, a MSDS for
each chemical proposed for use must be provided to the Division. The addition of chemicals may require
permitting under the Remediation Activities general permit that authorizes the discharge from remediation
activities (e.g., the discharge requires treatments to remove pollutants resulting from the chemical addition).
Chemicals used in waters that will, or may be, discharged to waters of the State must be used in accordance
with all state and federal regulations, and in strict accordance with the manufacturer’s site-specific
instructions.
4. Discharge Point
All waters shall be discharged in a manner to prevent erosion, scouring, or damage to stream banks,
streambeds, or ditches.
5. Discharges to Conveyances
All dischargers must comply with the lawful requirements of counties; drainage districts and other state or
local agencies regarding any discharges to storm drain systems or other watercourses under their jurisdiction.
6. Mixing Zone
For this general permit, all numeric effluent limitations are assigned as end of pipe limits based on the Water
Quality Standards. Dilution (i.e. mixing zone) considerations are not applicable in this permit. Dischargers
who want consideration of a mixing allowance should apply for an individual permit
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Permit No.:COG070000
7. Discharges to Waters with Total Maximum Daily Loads (TMDLs)
Discharges to State waters for which an approved or established TMDL has been developed may be
authorized provided there are sufficient remaining waste load allocations in the approved or established
TMDL. If sufficient remaining waste load allocations are not available, coverage under an Individual permit
may be required. If additional effluent limitations or other terms and conditions not included in this permit
are required for discharges to segments for which a TMDL has been completed, the discharge cannot be
covered under this general permit and must apply for coverage under another general permit or under an
individual permit. Factors that will be taken into consideration when making this determination include the
plausibility that the pollutant for which the TMDL was developed will be in the discharge, and duration and
frequency of the discharge.
8. Discharges to 303(d) Listed Waters
Sampling, monitoring and compliance with numeric effluent limitations may be required for discharges to
303(d) listed waters that are impaired for a specified pollutant(s), and that pollutant has the potential to be in
the construction dewatering project discharge. If additional effluent limitations or other terms and conditions
not included in this permit are required for discharges to 303(d), the discharge cannot be covered under this
general permit and must apply for coverage under another general permit or under an individual permit.
Factors that will be taken into consideration when making this determination include the plausibility that the
pollutant listed on the 303(d) list will be in the discharge, and duration and frequency of the discharge.
D. DEFINITIONS OF TERMS
1. “Construction Activities” refers to ground surface disturbing activities, which include, but are not limited
to, clearing, grading, excavation, demolition, installation of new or improved haul roads and access roads,
staging areas, stockpiling of fill materials, and borrow areas.
2. "Continuous" measurement is a measurement obtained from an automatic recording device which
continually measures provides measurements.
3. "Daily Maximum limitation" for all parameters except temperature, means the limitation for this parameter
shall be applied as an instantaneous maximum (or, for pH or DO, instantaneous minimum) value. The
instantaneous value is defined as the analytical result of any individual sample. DMRs shall include the
maximum (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous
value beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation
of this permit.
4. "Daily Maximum Temperature (DM)" is defined in the Basic Standards and Methodologies for Surface
Water 1002-31, as the highest two-hour average water temperature recorded during a given 24-hour period.
This will be determined using a rolling 2-hour maximum temperature. If data is collected every 15 minutes, a
2-hour maximum can be determined on every data point after the initial 2 hours of collection. Note that the
time periods that overlap days (Wednesday night to Thursday morning) do not matter as the reported value on
the DMR is the greatest of all the 2-hour averages.
For example, data points collected at:
08:15, 08:30, 08:45, 09:00, 09:15, 09:30, 09:45, 10:00, would be averaged for a single 2 hour average
data point
08:30, 08:45, 09:00, 09:15, 09:30, 09:45, 10:00, 10:15, would be averaged for a single 2-hour average data
Page 14 of 34
Permit No.:COG070000
point
08:45, 09:00, 09:15, 09:30, 09:45, 10:00, 10:15, 10:30, would be averaged for a single 2 hour average
data point
This would continue throughout the course of a calendar day. The highest of these 2-hour averages over a
month would be reported on the DMR as the daily maximum temperature. At the end/beginning of a
month, the collected data should be used for the month that contains the greatest number of minutes in the
2-hour maximum.
Data from 11 pm to 12:59 am would fall in the previous day. Data collected from 11:01 pm to 1:00 am
would fall in the new month.
5. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002-
31, as that portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM
(micron) membrane filter. Determinations of "dissolved" constituents are made using the filtrate. This may
include some very small (colloidal) suspended particles which passed through the membrane filter as well
as the amount of substance present in true chemical solution.
6. "Geometric mean" for E. coli bacteria concentrations, the thirty (30) day and seven (7) day averages shall
be determined as the geometric mean of all samples collected in a thirty (30) day period and the geometric
mean of all samples taken in a seven (7) consecutive day period respectively. The geometric mean may be
calculated using two different methods. For the methods shown, a, b, c, d, etc. are individual sample results,
and n is the total number of samples.
Method 1: Geometric Mean = (a*b*c*d*...)(1/n) "*" - means multiply
Method 2: Geometric Mean = antilog ( [log(a)+log(b)+log(c)+log(d)+...]/n )
Graphical methods, even though they may also employ the use of logarithms, may introduce significant
error and may not be used.
In calculating the geometric mean, for those individual sample results that are reported by the analytical
laboratory to be "less than" a numeric value, a value of 1 should be used in the calculations. If all
individual analytical results for the month are reported to be less than numeric values, then report "less
than" the largest of those numeric values on the monthly DMR. Otherwise, report the calculated value.
For any individual analytical result of "too numerous to count" (TNTC), that analysis shall be considered to
be invalid and another sample shall be promptly collected for analysis. If another sample cannot be collected
within the same sampling period for which the invalid sample was collected (during the same month if
monthly sampling is required, during the same week if weekly sampling is required, etc.), then the following
procedures apply:
i. A minimum of two samples shall be collected for coliform analysis within the next sampling period.
ii. If the sampling frequency is monthly or less frequent: For the period with the invalid sample
results, leave the spaces on the corresponding DMR for reporting coliform results empty and attach
to the DMR a letter noting that a result of TNTC was obtained for that period, and explain why
another sample for that period had not been collected.
If the sampling frequency is more frequent than monthly: Eliminate the result of TNTC from any further
calculations, and use all the other results obtained within that month for reporting purposes. Attach a letter
Page 15 of 34
Permit No.:COG070000
noting that a result of TNTC was obtained, and list all individual analytical results and corresponding
sampling dates for that month.
7. “Good Engineering, Hydrologic and Pollution Control Practices: means methods, procedures, and
practices that a) are based on basic scientific fact(s); b) reflect best industry practices and standards; c) are
appropriate for the conditions and pollutant sources; and d) provide appropriate solutions to meet the
associated permit requirements, including all effluent limitations.
8. "Grab" sample, is a single "dip and take" sample so as to be representative of the parameter being monitored.
9. “Groundwater” means any water not visible on the surface of the ground under natural conditions.
10. "In-situ" measurement is defined as a single reading, observation or measurement taken in the field at the
point of discharge.
11. "Instantaneous" measurement is a single reading, observation, or measurement performed on site
using existing monitoring facilities.
11. To be considered an “Intermittent Discharge” one of the following must
apply:
i. the maximum discharge frequency is less than 3 consecutive days (72 hours), an d less than 3
days per 7 day period, and less than 10 days total per month
ii. the maximum discharge frequency is less than 5 consecutive days (120 hours) and less than 5 total
days per month
iii. It can be shown that discharge frequency and duration is tied solely to precipitation events,
where the discharge starts and stops shortly after the precipitation event starts/stops.
12. "Maximum Weekly Average Temperature (MWAT)" is defined in the Basic Standards and
Methodologies for Surface Water 1002-31, as an implementation statistic that is calculated from field
monitoring data. The MWAT is calculated as the largest mathematical mean of multiple, equally spaced,
daily temperatures over a seven-day consecutive period, with a minimum of three data points spaced equally
through the day. For lakes and reservoirs, the MWAT is assumed to be equivalent to the maximum WAT
from at least three profiles distributed throughout the growing season (generall y July-September).
The MWAT is calculated by averaging all temperature data points collected during a calendar day, and then
averaging the daily average temperatures for 7 consecutive days. This 7 day averaging period is a rolling
average, i.e. on the 8th day, the MWAT will be the averages of the daily averages of days 2-8. The value to
be reported on the DMR is the highest of all the rolling 7-day averages throughout the month. For those
days that are at the end/beginning of the month, the data shall be reported for the month that contains 4 of the
7 days.
Day 1: Average of all temperature data collected during the calendar day.
Day 2: Average of all temperature data collected during the calendar day.
Day 3: Average of all temperature data collected during the calendar day.
Day 4: Average of all temperature data collected during the calendar day.
Day 5: Average of all temperature data collected during the calendar day.
Day 6: Average of all temperature data collected during the calendar day.
Day 7: Average of all temperature data collected during the calendar day.
1st MWAT Calculation as average of previous 7 days
Day 8: Average of all temperature data collected during the calendar day.
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Permit No.:COG070000
2nd MWAT Calculation as average of previous 7 days
Day 9: Average of all temperature data collected during the calendar day.
3rd MWAT Calculation as average of previous 7 days
13. "Potentially dissolved (PD) metals fraction” is defined in the Basic Standards and Methodologies for
Surface Water 1002-31, as that portion of a constituent measured from the filtrate of a water and suspended
sediment sample that was first treated with nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior
to sample filtration using a 0.40 or 0.45-UM (micron) membrane filter. Note the "potentially dissolved"
method cannot be used where nitric acid will interfere with the analytical procedure used for the constituent
measured.
14. "Practical Quantification Limit (PQL)" means the minimum concentration of an analyte (substance) that
can be measured with a high degree of confidence that the analyte is present at or above that concentration.
The use
of PQL in this document may refer to those PQLs shown in Part I.D of this permit or the PQLs of an
individual laboratory.
15. "Quarterly measurement frequency" means samples may be collected at any time during the calendar
quarter if a continual discharge occurs. If the discharge is intermittent, then samples shall be collected
anytime during the quarter that the discharge occurs. Calendar quarters are defined as January-March, April-
June, July- September, and October-December.
16. "Recorder" requires the continuous operation of a chart and/or totalizer (or drinking water rotor meters
or pump hour meters where previously approved.)
17. "Seven (7) day average" means, with the exception of fecal coliform or E. coli bacteria (see geometric
mean), the arithmetic mean of all samples collected in a seven (7) consecutive day period. Such seven (7)
day averages shall be calculated for all calendar weeks, which are defined as beginning on Sunday and
ending on Saturday. If the calendar week overlaps two months (i.e. the Sunday is in one month and the
Saturday in the following month), the seven (7) day average calculated for that calendar week shall be
associated with the month that contains the Saturday. Samples may not be used for more than one (1)
reporting period. (See the “Analytical and Sampling Methods for Monitoring and Reporting Section in
Part I.E.3 for guidance on calculating averages and reporting analytical results that are less than the
PQL).
18. “Sta te Waters" means any and all surface or subsurface waters which are contained in or flow in or through
this state, but does not include waters in sewage systems, waters in treatment works of disposal systems
waters in potable water distribution systems, and all water withdrawn for use until use and treatment have
been completed.
19. “Stormwater” means precipitation induced stormwater runoff, snow melt runoff, and surface runoff and
drainage
20. “Surface Water” means all surface waters that meet the definition of “State Waters” but does not meet the
definition of “stormwater runoff.”
21. "Thirty (30) day average" means, except for fecal coliform or E. coli bacteria (see geometric mean), the
arithmetic mean of all samples collected during a thirty (30) consecutive-day period. The permittee shall
report the appropriate mean of all self-monitoring sample data collected during the calendar month on
the Discharge Monitoring Reports. Samples shall not be used for more than one (1) reporting period.
(See the “Analytical and Sampling Methods for Monitoring and Reporting Section in Part I.E.3 for
guidance on calculating averages and reporting analytical results that are less than the PQL).
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Permit No.:COG070000
22. "Total Metals" means the concentration of metals determined on an unfiltered sample following vigorous
digestion (Section 4.1.3), or the sum of the concentrations of metals in both the dissolved and suspended
fractions, as described in Manual of Methods for Chemical Analysis of Water and Wastes, U.S.
Environmental Protection Agency, March 1979, or its equivalent.
23. "Total Recoverable Metals" means that portion of a water and suspended sediment sample measured by the
total recoverable analytical procedure described in Methods for Chemical Analysis of Water and Wastes,
U.S. Environmental Protection Agency, March 1979 or its equivalent.
24. “Visual” observation is observing the discharge to check for the presence of a visible sheen or floating oil.
25. “Water Quality Control Division" or "Division" means the state Water Quality Control Division as
established in 25-8-101 et al.)
26. "Weekly measurement frequency" means samples may be collected at any time during the week as defined
as beginning on Sunday and ending on Saturday. If the discharge is intermittent, a sample must be collected
for each week (as defined above) that the discharge occurs. A minimum of one sample must be collected for
discharges lasting less than one week. For example, if an intermittent discharge begins on Wednesday,
February 2nd and ends on Friday, February 4th, one sample must collected on the 2nd, 3rd, or 4th. If the
discharge resumes on Sunday, February 13 and is intermittent through Monday, February 14th an additional
sample must be collected on the 13th or 14th.
E. GENERAL MONITORING, SAMPLING AND REPORTING REQUIREMENTS
1. Routine Reporting of Data
Reporting of data gathered in compliance with Part I.B.2 shall be on a monthly basis. Reporting of all data
gathered shall compl y with the requirements of Part I.E. (General Requirements). Monitoring results shall
be summarized for each calendar month and reported on Division approved discharge monitoring report
(DMR) forms (EPA form 3320-1).
The permittee must submit these forms either by mail, or by using the Division’s Net-DMR services (when
available). DMRs must be received by the Division no later than the 28th day of the month following the
monitoring period (for example, the DMR for discharges occurring in January must be received by the
Division by February 28th). If no discharge occurs during the reporting period, "No Discharge" shall be
reported on the DMR.
If being mailed, the original signed copy of each discharge monitoring report (DMR) shall be submitted to
the Division at the following address:
Colorado Department of Public Health and Environment
Water Quality Control Division
WQCD-P-B2
4300 Cherry Creek Drive South
Denver, Colorado 80246-1530
The Discharge Monitoring Report forms shall be filled out accurately and completely in accordance with
requirements of this permit and the instructions on the forms. They shall be signed by an authorized person
as identified in Part I.E.8.
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Permit No.:COG070000
2. Reporting for Undefined Outfalls
DMRs will be mailed to the permittee for each of the numbered undefined discharge outfalls identified in the
permit certification.
Each outfall identified in the permit certification, and the associated DMR forms for that outfall shall only
authorize and be used for reporting discharges at a single outfall at a specific location. The permittee shall
establish and maintain records that identify, among other information, the exact place for each outfall for
which monitoring has occurred in accordance with Part I. B. of the permit.
DMRs for all outfalls must be submitted monthly as long as the certification is in effect. DMRs must be
submitted for each outfall even if there was not a discharge from the outfall in a given month. For each
outfall where no discharge occurs in a given month, the permittee shall mark ‘No Discharge’ on the DMR
form(s). The permittee shall provide the Division with any additional monitoring data on the permitted
discharge collected for entities other than the Division. If forms have not been received, please contact the
Division at 303-692-3517.
Sampling is required at the frequency established in the permit certification for each undefined discharge
location. For multiple undefined discharge locations, as discharges occur chronologically, the data collected
from the sampling event(s) in a given month from the first discharge location shall be summarized and
reported on the pre-printed DMR for Discharge Number 001-AU. The data collected from the sampling
event(s) in a given month from the second discharge location shall be summarized and reported on the pre-
printed DMR for Discharge Number 002-AU; etc. If there is only one undefined outfall location requested in
the permit application, the permit certification will only authorize one discharge location (outfall) to state
water within the project boundary. The data collected from the sampling event(s) in a given month from the
one authorized discharge location shall be summarized and reported on the pre-printed DMR for Discharge
Number 001-AU.
3. Representative Sampling
Discharge points shall be designed or modified so that a sample of the effluent can be obtained at a point after
the final treatment process and prior to discharge to state waters. Samples and measurements taken as
required herein shall be representative of the volume and nature of the monitored discharge. All samples shall
be taken at the monitoring points specified in this permit and, unless otherwise specified, before the effluent
joins or is diluted by any other waste stream, body of water, or substance. Monitoring points shall not be
changed without notification to and approval by the Division. The permittee shall provide access to the
Division to sample the discharge at these points.
4. Analytical and Sampling Methods for Monitoring and Reporting
The permittee shall install, calibrate, use and maintain monitoring methods and equipment, including
biological and indicated pollutant monitoring methods. All sampling shall be performed by the permittee
according to specified methods in 40 C.F.R. Part 136; methods approved by EPA pursuant to 40 C.F.R.
Part 136; or methods approved by the Division, in the absence of a method specified in or approved
pursuant to 40 C.F.R. Part 136 (see text below for specifics on nonylphenol monitoring).
If the permit contains a numeric effluent limit for a parameter, the analytical method and PQL selected for
all monitoring conducted in accordance with this permit for that parameter shall be the one that can
measure at or below the numeric effluent limit. If all specified analytical methods and corresponding
PQLs are greater than the numeric effluent limit, then the analytical method with the lowest PQL shall be
used.
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Permit No.:COG070000
If the permit contains a report only requirement for a parameter, the analytical method and PQL chosen
shall be one that can measure at or below the potential numeric effluent limit(s). If all analytical methods
and corresponding PQLs are greater than the potenti al numeric effluent limit(s), then the analytical
method with the lowest PQL shall be used.
If the permit contains an interim effluent limitation (a limit is report until such time as a numeri c effluent
limit becomes effective) for a parameter, the analytical method and PQL chosen for all monitoring
conducted in accordance with this permit for the parameter shall be one that can measure to the final
numeric effluent limit. If all analytical methods and corresponding PQLs are greater than the final
numeric effluent limit(s), then the analytical method with the lowest PQL shall be used.
For parameters such as TIN, the analytical methods chosen shall be those that can measure to the potential
or final numeric effluent limit, based on the sum of the PQLs for nitrate, nitrite and ammonia.
When the analytical method which complies with the above requirements has a PQL greater than the
permit limit, and the permittee’s analytical result is less than the PQL, the permittee shall report "BDL" on
the DMR. Such reports will not be considered as violations of the permit limit, as long as the lowest
available PQL is used for the analysis. When the analytical method which complies with the above
requirements has a PQL that is equal to or less than the permit limitation, and the permittee’s analyti cal
result is less than the PQL, “< X” (where X = the actual PQL achieved by the laboratory) shall be reported
on the DMR. For parameters that have a report only limitation, and the permittee’s analytical result is less
than the PQL, “< X” (where X = the actual PQL achieved by the laboratory) shall be reported on the
DMR.
In the calculation of average concentrations (i.e. 7- day average, 30-day average, 2-year rolling average)
any individual analytical result that is less than the PQL shall be considered to be zero for the calculation
purposes. When reporting:
If all individual analytical results are less than the PQL, the permittee shall report either “BDL” or “<X”
(where X = the actual PQL achieved by the laboratory), following the guidance above.
If one or more individual results is greater than the PQL, an average shall be calculated and reported.
Note that it does not matter if the final calculated average is greater or less than the PQL, it must be
reported as a value.
Note that when calculating T.I.N. for a single sampling event, any value less than the PQL (for total
ammonia, total nitrite, or total nitrate) shall be treated as zero. The T.I.N. concentration for a single
sampling event shall then be determined as the sum of the analytical results (zeros if applicable) of same
day sampling for total ammonia and total nitrite and total nitrate. From these calculated T.I.N.
concentrations, the daily max imum and thirty day average concentrations shall be calculated and must be
reported as a value.
The present lowest PQLs for specific parameters, as determined by the State Laboratory (November
2008) are provided below. If the analytical method cannot achieve a PQL that is less than or equal to the
permit limit, then the method, or a more precise method, must achieve a PQL that is less than or equal to the
PQL in the table below. A listing of the PQLs for organic parameters that must meet the above requirement
can be found in the Division’s Practical Quantification Limitation Guidance Document, July 2008.
For nonylphenol, until such time as there is an EPA 40 CFR Part 136 method, the State is approving use of
ASTM Methods D7065 and D7485. Until a statewide PQL has been developed, the permittee shall use
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either the default PQLs listed in the table below, or develop their own site-specific PQL in accordance with
the Practical Quantification Limitation Guidance Document (July 2008) for Organic Parameters. Thi s
document is available on the Division’s website at www.coloradowaterpermits.com . The delayed effective
date for the monitoring requirement allows time for the permittee to develop a site-specific PQL.
For hexavalent chromium, samples must be unacidified so dissolved concentrations will be measured rather
than potentially dissolved concentrations.
Parameter Practical
Quantification
Limits,
Parameter Practical
Quantification
Limits, µg/l
Aluminum 50 µg/l Manganese 2 µg/l
Ammonia 1 mg/l Mercury 0.1 µg/l
Arsenic 1 µg/l Mercury (low-level) 0.003 µg/l
Barium 5 µg/l Nickel 50 µg/l
Beryllium 1 µg/l N-Ammonia 50 µg/l
BOD / CBOD 1 mg/l N Nitrate/Nitrite 0.5 mg/l
Boron 50 µg/l N-Nitrate 50 µg/l
Cadmium 1 µg/l N-Nitrite 10 µg/l
Calcium 20 µg/l Total Nitrogen 0.5 mg/l
Chloride 2 mg/l Phenols 100 µg/l
Chlorine 0.1 mg/l Phosphorus 10 µg/l
Total Residual
Chlorine
Radium 226 1 pCi/l
- DPD colorimetric 0.10 mg/l Radium 228 1 pCi/l
- Amperometric titration 0.05 mg/l Selenium 1 µg/l
Chromium 20 µg/l Silver 0.5 µg/l
Chromium, Hexavalent 20 µg/l Sodium 0.2 mg/l
Copper 5 µg/l Sulfate 5 mg/l
Cyanide (Direct /
Distilled)
10 µg/l Sulfide 0.2 mg/l
Cyanide, WAD+A47 5 µg/l Total Dissolved
Solids
10 mg/l
Fluoride 0.1 mg/l Total Suspended
Solids
10 mg/l
Iron 10 µg/l Thallium 1 µg/l
Lead 1 µg/l Uranium 1 µg/l
Magnesium 20 µg/l Zinc 10 µg/l
5. Records
The permittee shall establish and maintain records. The records shall include the following:
a. The date, type, exact location, and time of sampling or measurements;
b. The individual(s) who performed the sampling or measurements;
c. The date(s) the analyses were performed;
d. The individual(s) who performed the analyses;
e. The analytical techniques or methods used;
f. The results of such analyses; and
g. Any other observations which may result in an impact on the quality or quantity of the
discharge as indicated in 40 CFR 122.44 (i)(1)(iii).
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The permittee shall retain for the duration of permit coverage or a minimum of three (3) years (whichever is
greater) records of all monitoring information, including all original strip chart recordings for continuous
monitoring instrumentation, all calibration and maintenance records, laboratory data sheets, copies of all
reports required by this permit and records of all data used to complete the application for this permit. This
period of retention shall be extended during the course of any unresolved litigation regarding the discharge of
pollutants by the permittee or when requested by the Division or EPA. These records must be retained at the
facilit y during active treatment. Once active treatment is complete, the records shall be maintained and made
available at the request of the Division.
6. Additional Monitoring by Permittee
If the permittee, using the approved analytical methods, monitors any parameter more frequently than
required by this permit, then the results of such monitoring shall be included in the calculation and reporting
of the values required in the Discharge Monitoring Report Form or other forms as required by the Division.
Such increased frequency shall also be indicated.
7. Flow Measuring Device
Flow can be measured or determined from estimates based on volume of fill water, dimension of the pipeline,
capacity of the pump, or other method documented in accordance with I.C.1.e (Discharge Log).
At the request of the Division, the permittee shall show proof of the accuracy of any flow-measuring device or
method used in obtaining data submitted in the monitoring report. The flow-measuring device must indicate
values within ten (10) percent of the actual flow being discharged from the facility.
8. Signatory and Certification Requirements
a. All applications must be signed and certified for accuracy as follows:
(i) In the case of corporations, by a responsible corporate officer. For purposes of this section, the
responsible corporate officer is responsible for the overall operation of the facility from which
the discharge described in the form originates;
(ii) In the case of partnership, by a general partner;
(iii) In the case of a sole proprietorship, by the proprietor;
(iv) In the case of a municipal, state, or other public facility, by either a principal executive officer or
ranking elected official. For purposes of this section, a principal executive officer has
responsibility for the overall operation of the facility from which the discharge originates.
b. All reports and other information required by the Division shall be signed and certified for accuracy by
the permittee in accord with the following criteria:
i) In the case of corporations, by a responsible corporate officer. For purposes of this section, the
responsible corporate officer is responsible for the overall operation of the facility from which the
discharge described in the form originates;
ii) In the case of a partnership, by a general partner;
iii) In the case of a sole proprietorship, by the proprietor;
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Permit No.:COG070000
iv) In the case of a municipal, state, or other public facility, by either a principal executive officer, or
ranking elected official. For purposes of this section, a principal executive officer has responsibility
for the overall operation of the facility from which the discharge originates;
v) By a duly authorized representative of a person described above, only if:
1) The authorization is made in writing by a person described in i, ii, iii, or iv above;
2) The authorization specifies either an individual or a position having responsibility for the overall
operation of the regulated facility or activity such as the position of plant manager, operator of a
well or a well field, superintendent, position of equivalent responsibility, or an individual or
position having overall responsibility for environmental matters for the company. (A duly
authorized representative may thus be either a named individual or any individual occupying a
named position); and,
3) The written authorization is submitted to the Division.
c. If an authorization as described in this section is no longer accurate because a different individual
or position has responsibility for the overall operation of the facility, a new authorization satisfying
the requirements of this section must be submitted to the Division prior to or together with any
reports, information, or applications to be signed by an authorized representative.
The permittee, or the duly authorized representative shall make and sign the following certification
on all such documents:
"I certify under penalty of law that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is to the best of my knowledge and belief, true, accurate and
complete. I am aware that there are significant penalties for submitting false information, including
the possibility of fine and imprisonment for knowing violations."
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Permit No.:COG070000
Part II
A. NOTIFICATIONREQUIREMNTS
1. Notification to Parties
All notification requirements under this section shall be directed as follows:
a. Oral Notifications, during normal business hours shall be to:
Water Quality Protection Section - Industrial Compliance Program
Water Quality Control Division
Telephone: (303) 692-3500
b. Written notification shall be to:
Water Quality Protection Section - Industrial Compliance Program
Water Quality Control Division
Colorado Department of Public Health and Environment
WQCD-WQP-B2
4300 Cherry Creek Drive South
Denver, CO 80246-1530
2. Change in Discharge or Wastew ater Treatment
The permittee shall notify the Division in writing, of any planned physical alterations or additions to
the permitted facility, this includes the treatment process. Notice is required when:
a. The alteration or addition is likely to result in a new or altered discharge either in terms of location
or effluent quality prior to the occurrence of the new or altered discharge, or;
b. The alteration or addition results in a significant change in the permittee's sludge use or disposal
practices, and such alteration, addition, or change may justify the application of permit conditions that
are different from or absent in the existing permit, including notification of additional use or disposal
sites not reported pursuant to an approved land application plan.
The permittee shall give advance notice to the Division of any planned changes in the permitted facility or
activity which may result in noncompliance with permit requirements. For any pollutant for which
monitoring requirements are not included in the permit certification, the permittee shall notify the Division as
soon as it becomes aware that the pollutant(s) are present in the source water, influent, or effluent in
concentrations greater than originally identified in the application.
Whenever notification of any planned physical alterations or additions to the permitted facility is
required pursuant to this section, the permittee shall furnish the Division such plans and specifications
which the Division deems reasonably necessary to evaluate the effect on the discharge, the stream, or
ground water.
If the Division finds that such new or altered discharge might be inconsistent with the conditions of the
permit, the Division shall require a new or revised permit application or a permit modification and shall
follow the procedures specified in Sections 61.5 through 61.6, and 61.15 of the Colorado Discharge
Permit System Regulations.
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Permit No.:COG070000
3. Special Notifications Definitions
a. Bypass: The intentional diversion of waste streams from any portion of a treatment facility.
b. Severe Property Damage: Substantial physical damage to property at the treatment facilities which causes
them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be
expected to occur in the absence of a bypass. It does not mean economic loss caused by delays in
production.
c. Upset: An exceptional incident in which there is unintentional and temporary noncompliance with permit
effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not
include noncompliance to the extent caused by operational error, improperly designed treatment facilities,
inadequate treatment facilities, lack of preventative maintenance, or careless or improper operation.
4. Noncompliance Notification
a. If, for any reason, the permittee does not comply with or will be unable to comply with any discharge
limitations or standards specified in this permit, the permittee shall, at a minimum, provide the Division
with the following information:
i) A description of the discharge and cause of noncompliance;
ii) The period of noncompliance, including exact dates and times and/or the anticipated time when
the discharge will return to compliance; and
iii) Steps being taken to reduce, eliminate, and prevent recurrence of the noncomplying discharge.
b. The permittee shall report the following circumstances orally within twenty-four (24) hours from the
time the permittee becomes aware of the circumstances, and shall mail to the Division a written report
containing the information requested in Part II.A.4 (a) within five (5) days after becoming aware of the
following circumstances:
i) Circumstances leading to any noncompliance which may endanger health or the environment
regardless of the cause of the incident;
ii) Circumstances leading to any unanticipated bypass which exceeds any effluent limitations in the
permit;
iii) Circumstances leading to any upset which causes an exceedance of any effluent limitation in the
permit;
iv) Daily maximum violations for any of the pollutants limited by Part I.A of this permit and specified as
requiring 24-hour notification. This includes any toxic pollutant or hazardous substance or any
pollutant specifically identified as the method to control any toxic pollutant or hazardous substance.
c. Unless otherwise indicated in this permit, the permittee shall report instances of non-compliance which are
not required to be reported within 24-hours at the time Discharge Monitoring Reports are submitted. The
reports shall contain the information listed in sub-paragraph (a) of this section.
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Permit No.:COG070000
5. Other Notification Requirements
Reports of compliance or noncompliance with, or any progress reports on, interim and final
requirements contained in any compliance schedule in the permit shall be submitted no later than
fourteen (14) days following each scheduled date, unless otherwise provided by the Division.
The permittee shall notify the Division, in writing, thirty (30) days in advance of a proposed transfer of
permit as provided in Part II.B.3.
The permittee's notification of all anticipated noncompliance does not stay any permit condition.
All existing manufacturing, commercial, mining, and silvicultural dischargers must notify the Division
as soon as they know or have reason to believe:
a. That any activity has occurred or will occur which would result in the discharge, on a routine or frequent
basis, of any toxic pollutant which is not limited in the permit, if that discharge will exceed the highest of
the following "notification levels":
i) One hundred micrograms per liter (100 µg/l);
ii) Two hundred micrograms per liter (200 µg/l) for acrolein and acrylonitrile; five hundred micrograms
per liter (500 µg/l) for 2.4-dinitrophenol and 2-methyl-4.6-dinitrophenol; and one milligram per liter
(1.0 mg/l) for antimony;
iii) Five (5) times the maximum concentration value reported for that pollutant in the permit
application in accordance with Section 61.4(2)(g).
iv) The level established by the Division in accordance with 40 C.F.R. § 122.44(f).
b. That any activity has occurred or will occur which would result in any discharge, on a non-routine or
infrequent basis, of a toxic pollutant which is not limited in the permit, if that discharge will exceed the
highest of the following "notification levels":
i) Five hundred micrograms per liter (500 µg/l);
ii) One milligram per liter (1 mg/l) for antimony; and
iii) Ten (10) times the maximum concentration value reported for that pollutant in the permit application
iv) The level established by the Division in accordance with 40 C.F.R. § 122.44(f).
6. Bypass Notification
If the permittee knows in advance of the need for a bypass, a notice shall be submitted, at least ten days
before the date of the bypass, to the Division. The bypass shall be subject to Division approval and
limitations imposed by the Division. Violations of requirements imposed by the Division will constitute a
violation of this permit.
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Permit No.:COG070000
7. Upsets
a. Effect of an Upset
An upset constitutes an affirmative defense to an action brought for noncompliance with permit
effluent limitations if the requirements of paragraph (b) of this section are met. No determination
made during administrative review of claims that noncompliance was caused by upset, and before an
action for noncompliance, is final administrative action subject to judicial review.
b. Conditions Necessary for a Demonstration of Upset
Permittee who wishes to establish the affirmative defense of upset shall demonstrate through
properly si gned contemporaneous operating logs, or other relevant evidence that:
i) An upset occurred and that the permittee can identify the specific cause(s) of the upset;
and
ii) The permitted facility was at the time being properly operated and maintained; and
iii) The permittee submitted proper notice of the upset as required in Part II.A.4. of this
permit (24-hour notice); and
iv) The permittee complied with any remedial measure necessary to minimize or prevent any
discharge or sludge use or disposal in violation of this permit which has a reason able
likelihood of adversely affecting human health or the environment.
In addition to the demonstration required above, a permittee who wishes to establish the affirmative
defense of upset for a violation of effluent limitations based upon water quality standards shall also
demonstrate through monitoring, modeling or other methods that the relevant standards were
achieved in the receiving water.
c. Burden of Proof
In any enforcement proceeding, the permittee seeking to establish the occurrence of an upset has
the burden of proof.
8. Discharge Point
Any discharge to the waters of the State from a point source other than specifically authorized by this permit
is prohibited.
9. Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems of treatment and
control (and related appurtenances) which are installed or used by the permittee as necessary to achieve
compliance with the conditions of this permit. Proper operation and maintenance includes effective
performance and adequate laboratory and process controls, including appropriate quality assurance
procedures (40 CFR 122.41(e)). This provision requires the operation of back-up or auxiliary facilities or
similar systems which are installed by the permittee only when necessary to achieve compliance with the
conditions of the permit.
10. Minimization of Adverse Impact
The permittee shall take all reasonable steps to minimize or prevent any discharge of sludge use or disposal
in violation of this permit which has a reasonable likelihood of adversely affecting human health or the
environment. As necessary, accelerated or additional monitoring to determine the nature and impact of the
noncomplying discharge is required.
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Permit No.:COG070000
11. Removed Substances
Solids, sludges, or other pollutants removed in the course of treatment or control of wastewaters shall be
disposed of in accordance with applicable state and federal regulations and in a manner that will prevent
the removed pollutant(s) from entering waters of the State.
For all domestic wastewater treatment works, at industrial facilities, the permittee shall dispose of sludge
in accordance with all State and Federal regulations.
12. Submission of Incorrect or Incomplete Information
Where the permittee failed to submit any relevant facts in a permit application, or submitted incorrect
information in a permit application or report to the Division, the permittee shall promptly submit the
relevant information which was not submitted or any additional information needed to correct any
erroneous information previously submitted.
13. Bypass
a. Bypasses are prohibited and the Division may take enforcement action against the permittee for
bypass, unless:
i) The bypass is unavoidable to prevent loss of life, personal injury, or severe property damage;
ii) There were no feasible alternatives to bypass such as the use of auxiliary treatment facilities,
retention of untreated wastes, or maintenance during normal periods of equipment downtime. This
condition is not satisfied if adequate back-up equipment should have been installed in the exercise of
reasonable engineering judgment to prevent a bypass which occurred during normal periods of
equipment downtime or preventive maintenance; and
iii) Proper notices were submitted in compliance with Part II.A.4.
b. "Severe property damage" as used in this Subsection means substantial physical damage to the treatment
facilities which causes them to become inoperable, or substantial and permanent loss of natural
resources which can reasonably be expected to occur in the absence of a bypass. Severe property
damage does not mean economic loss caused by delays in production.
c. The permittee may allow a bypass to occur which does not cause effluent limitations to be exceeded, but
only if it also is for essential maintenance or to assure optimal operation. These bypasses are not subject
to the provisions of paragraph (a) above.
d. The Division may approve an anticipated bypass, after considering adverse effects, if the
Division determines that the bypass will meet the conditions specified in paragraph (a) above.
14. Reduction, Loss, or Failure of Treatment Facility
The permittee has the duty to halt or reduce any activity if necessary to maintain compliance with the
effluent limitations of the permit. Upon reduction, loss, or failure of the treatment facility, the permittee
shall, to the extent necessary to maintain compliance with its permit, control production, control sources of
wastewater, or all discharges, until the facility is restored or an alternative method of treatment is provided.
This provision also applies to power failures, unless an alternative power source sufficient to operate the
wastewater control facilities is provided.
It shall not be a defense for a permittee in an enforcement action that it would be necessary to halt or
reduce the permitted activity in order to maintain compliance with the conditions of this permit.
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Permit No.:COG070000
B. RESPONSIBILITIES
1. Inspections and Right to Entry
The permittee shall allow the Division and/or the authorized representative, upon the presentation
of credentials:
a. To enter upon the permittee's premises where a regulated facility or activity is located or in which
any records are required to be kept under the terms and conditions of this permit;
b. At reasonable times to have access to and copy any records required to be kept under the terms and
conditions of this permit and to inspect any monitoring equipment or monitoring method required in
the permit; and
c. To enter upon the permittee's premises in a reasonable manner and at a reasonable time to inspect and/or
investigate, any actual, suspected, or potential source of water pollution, or to ascertain compliance or
non-compliance with the Colorado Water Quality Control Act or any other applicable state or federal
statute or regulation or any order promulgated by the Division. The investigation may include, but is not
limited to, the following: sampling of any discharge and/or process waters, the taking of photographs,
interviewing of any person having knowledge related to the discharge permit or alleged violation, access
to any and all facilities or areas within the permittee's premises that may have any affect on the discharge,
permit, or alleged violation. Such entry is also authorized for the purpose of inspecting and copying
records required to be kept concerning any effluent source.
d. The permittee shall provide access to the Division to sample the discharge at a point after the
final treatment process but prior to the discharge mixing with state waters upon presentation of
proper credentials.
In the making of such inspections, investigations, and determinations, the Division, insofar as practicable,
may designate as its authorized representatives any qualified personnel of the Department of Agriculture.
The Division may also request assistance from any other state or local agency or institution.
2. Duty to Provide Information
The permittee shall furnish to the Division, within a reasonable time, any information which the Division
may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this
permit, or to determine compliance with this permit. The permittee shall also furnish to the Division, upon
request, copies of records required to be kept by this permit.
3. Transfer of Ow nership or Control
a. Except as provided in paragraph b. of this section, a permit may be transferred by a permittee only if the
permit has been modified or revoked and reissued as provided in Section 61.8(8) of the Colorado
Discharge Permit System Regulations, to identify the new permittee and to incorporate such other
requirements as may be necessary under the Federal Act.
b. A permit may be automatically transferred to a new permittee if:
i) The current permittee notifies the Division in writing 30 days in advance of the proposed transfer date;
and
ii) The notice includes a written agreement between the existing and new permittee(s) containing a
specific date for transfer of permit responsibility, coverage and liability between them; and
iii) The Division does not notify the existing permittee and the proposed new permittee of its intent to
modify, or revoke and reissue the permit.
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Permit No.:COG070000
iv) Fee requirements of the Colorado Discharge Permit System Regulations, Section 61.15, have been met.
4. Availability of Reports
Except for data determined to be confidential under Section 308 of the Federal Clean Water Act and the
Colorado Discharge Permit System Regulations 5 CCR 1002-61, Section 61.5(4), all reports prepared in
accordance with the terms of this permit shall be available for public inspection at the offices of the
Division and the Environmental Protection Agency.
The name and address of the permit applicant(s) and permittee(s), permit applications, permits and effluent
data shall not be considered confidential. Knowingly making false statements on any such report may result
in the imposition of criminal penalties as provided for in Section 309 of the Federal Clean Water Act, and
Section 25-8-610 C.R.S.
5. Modification, Suspension, Revocation, or Termination of Permits By the Division
The filing of a request by the permittee for a permit modification, revocation and reissuance, termination or
a notification of planned changes or anticipated noncompliance, does not stay any permit condition.
a. A permit may be modified, suspended, or terminated in whole or in part during its term for
reasons determined by the Division including, but not limited to, the following:
i) Violation of any terms or conditions of the permit;
ii) Obtaining a permit by misrepresentation or failing to disclose any fact which is material to the
granting or denial of a permit or to the establishment of terms or conditions of the permit; or
iii) Materially false or inaccurate statements or information in the permit application or the permit.
iv) A determination that the permitted activity endangers human health or the classified or existing uses
of state waters and can only be regulated to acceptable levels by permit modifications or termination.
b. A permit may be modified in whole or in part for the following causes, provided that such
modification complies with the provisions of Section 61.10 of the Colorado Discharge Permit System
Regulations:
i) There are material and substantial alterations or additions to the permitted facility or activity which
occurred after permit issuance which justify the application of permit conditions that are different
or absent in the existing permit.
ii) The Division has received new information which was not available at the time of permit issuance
(other than revised regulations, guidance, or test methods) and which would have justified the
application of different permit conditions at the time of issuance. For permits issued to new sources
or new dischargers, this cause includes information derived from effluent testing required under
Section 61.4(7)(e) of the Colorado Discharge Permit System Regulations. This provision allows a
modification of the permit to include conditions that are less stringent than the existing permit only to
the extent allowed under Section 61.10 of the Colorado Discharge Permit System Regulations.
iii) The standards or regulations on which the permit was based have been changed by promulgation of
amended standards or regulations or by judicial decision after the permit was issued. Permits may
be modified during their terms for this cause only as follows:
(A) The permit condition requested to be modified was based on a promulgated effluent limitation
guideline, EPA approved water quality standard, or an effluent limitation set forth in 5 CCR
1002-62, § 62 et seq.; and
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Permit No.:COG070000
(B) EPA has revised, withdrawn, or modified that portion of the regulation or effluent limitation
guideline on which the permit condition was based, or has approved a Commission action with
respect to the water quality standard or effluent limitation on which the permit condition was
based; and
(C) The permittee requests modification after the notice of final action by which the EPA
effluent limitation guideline, water quality standard, or effluent limitation is revised,
withdrawn, or modified; or
(D) For judicial decisions, a court of competent jurisdiction has remanded and stayed EPA
promulgated regulations or effluent limitation guidelines, if the remand and stay concern that
portion of the regulations or guidelines on which the permit condition was based and a request is
filed by the permittee in accordance with this Regulation, within ninety (90) days of judicial
remand.
iv) The Division determines that good cause exists to modify a permit condition because of events
over which the permittee has no control and for which there is no reasonable available remedy.
v) The permittee has received a variance.
vi) When required to incorporate applicable toxic effluent limitation or standards adopted pursuant to
§307(a) of the Federal act.
vii) When required by the reopener conditions in the permit.
viii) As necessary under 40 C.F.R. 403.8(e), to include a compliance schedule for the development of a
pretreatment program.
ix) When the level of discharge of any pollutant which is not limited in the permit exceeds the level
which can be achieved by the technology-based treatment requirements appropriate to the
permittee under Section 61.8(2) of the Colorado Discharge Permit System Regulations.
x) To establish a pollutant notification level required in Section 61.8(5) of the Colorado Discharge
Permit System Regulations.
xi) To correct technical mistakes, such as errors in calculation, or mistaken interpretations of law
made in determining permit conditions, to the extent allowed in Section 61.10 of the Colorado
State Discharge Permit System Regulations.
xii) When required by a permit condition to incorporate a land application plan for beneficial reuse of
sewage sludge, to revise an existing land application plan, or to add a land application plan.
xiii) For any other cause provided in Section 61.10 of the Colorado Discharge Permit System
Regulations.
c. At the request of a permittee, the Division may modify or terminate a permit and issue a new permit if
the following conditions are met:
i) The Regional Administrator has been notified of the proposed modification or termination and does
not object in writing within thirty (30) days of receipt of notification,
ii) The Division finds that the permittee has shown reasonable grounds consistent with the Federal and
State statutes and regulations for such modifications or termination;
iii) Requirements of Section 61.15 of the Colorado Discharge Permit System Regulations have been
met, and
iv) Requirements of public notice have been met.
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d. Permit modification (except for minor modifications), termination or revocation and reissuance actions
shall be subject to the requirements of Sections 61.5(2), 61.5(3), 61.6, 61.7 and 61.15 of the Colorado
Discharge Permit System Regulations. The Division shall act on a permit modification request, other than
minor modification requests, within 180 days of receipt thereof. Except for minor modifications, the terms
of the existing permit govern and are enforceable until the newly issued permit is formally modified or
revoked and reissued following public notice.
e. Upon consent by the permittee, the Division may make minor permit modifications without following the
requirements of Sections 61.5(2), 61.5(3), 61.7, and 61.15 of the Colorado Discharge Permit System
Regulations. Minor modifications to permits are limited to:
i) Correcting typographical errors; or
ii) Increasing the frequency of monitoring or reporting by the permittee; or
iii) Changing an interim date in a schedule of compliance, provided the new date of compliance is not
more than 120 days after the date specific in the existing permit and does not interfere with
attainment of the final compliance date requirement; or
iv) Allowing for a transfer in ownership or operational control of a facility where the Division
determines that no other change in the permit is necessary, provided that a written agreement
containing a specific date for transfer of permit responsibility, coverage and liability between the
current and new permittees has been submitted to the Division; or
v) Changing the construction schedule for a discharger which is a new source, but no such change shall
affect a discharger's obligation to have all pollution control equipment installed and in operation
prior to discharge; or
vi) Deleting a point source outfall when the discharge from that outfall is terminated and does not result
in discharge of pollutants from other outfalls except in accordance with permit limits.
f. When a permit is modified, only the conditions subject to modification are reopened. If a permit is
revoked and reissued, the entire permit is reopened and subject to revision and the permit is reissued for
a new term.
g. The filing of a request by the permittee for a permit modification, revocation and reissuance or
termination does not stay any permit condition.
h. All permit modifications and reissuances are subject to the antibacksliding provisions set forth in
61.10(e) through (g).
6. Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee
from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to under Section
311 (Oil and Hazardous Substance Liability) of the Clean Water Act.
7. State Law s
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee
from any responsibilities, liabilities, or penalties established pursuant to any applicable State law or regulation
under authority granted by Section 510 of the Clean Water Act. Nothing in this permit shall be construed to
prevent or limit application of any emergency power of the division.
8. Permit Violations
Failure to comply with any terms and/or conditions of this permit shall be a violation of this permit. The
discharge of any pollutant identified in this permit more frequently than or at a level in excess of that
Page 32 of 34
Permit No.:COG070000
authorized shall constitute a violation of the permit. Except as provided in Part I.E and Part II.A or B, nothing
in this permit shall be construed to relieve the permittee from civil or criminal penalties for noncompliance
(40 CFR 122.41(a)(1)).
9. Property Rights
The issuance of this permit does not convey any property or water rights in either real or personal property, or
stream flows, or any exclusive privileges, nor does it authorize any injury to private property or any invasion of
personal rights, nor any infringement of Federal, State or local laws or regulations.
10. Severability
The provisions of this permit are severable. If any provision of this permit, or the application of any provision
of this permit to any circumstance, is held invalid, the application of such provision to other circumstances and
the application of the remainder of this permit shall not be affected.
11. Renew al Application
If the permittee desires to continue to discharge, a permit renewal application shall be submitted at least one
hundred eighty (180) days before this permit expires. If the permittee anticipates there will be no discharge
after the expiration date of this permit, the Division should be promptly notified so that it can terminate the
permit in accordance with Part II.B.5.
12. Confidentiality
Any information relating to any secret process, method of manufacture or production, or sales or marketing
data which has been declared confidential by the permittee, and which may be acquired, ascertained, or
discovered, whether in any sampling investigation, emergency investigation, or otherwise, shall not be publicly
disclosed by any member, officer, or employee of the Commission or the Division, but shall be kept
confidential. Any person seeking to invoke the protection of this Subsection (12) shall bear the burden of
proving its applicability. This section shall never be interpreted as preventing full disclosure of effluent data.
13. Fees
The permittee is required to submit payment of an annual fee as set forth in the 2005 amendments to the Water
Quality Control Act. Section 25-8-502 (l) (b), and the Colorado Discharge Permit System Regulations 5 CCR
l002-61, Section 61.l5 as amended. Failure to submit the required fee when due and payable is a violation of
the permit and will result in enforcement action pursuant to Section 25-8-60l et. seq., C.R.S. l973 as amended.
14. Duration of Permit
The duration of a permit shall be for a fixed term and shall not exceed five (5) years. Filing of a timely and
complete application shall cause the expired permit to continue in force to the effective date of the new permit.
The permit's duration may be extended only through administrative extensions and not through interim
modifications.
15. Section 307 Toxics
If a toxic effluent standard or prohibition, including any applicable schedule of compliance specified, is
established by regulation pursuant to Section 307 of the Federal Act for a toxic pollutant which is present in
the permittee's discharge and such standard or prohibition is more stringent than any limitation upon such
pollutant in the discharge permit, the Division shall institute proceedings to modify or revoke and reissue the
permit to conform to the toxic effluent standard or prohibition.
Page 33 of 34
Permit No.:COG070000
16. Effect of Permit Issuance
a. The issuance of a permit does not convey any property rights or any exclusive privilege.
b. The issuance of a permit does not authorize any injury to person or property or any invasion of personal
rights, nor does it authorize the infringement of federal, state, or local laws or regulations.
c. Except for any toxic effluent standard or prohibition imposed under Section 307 of the Federal act or any
standard for sewage sludge use or disposal under Section 405(d) of the Federal act, compliance with a
permit during its term constitutes compliance, for purposes of enforcement, with Sections 301, 302, 306,
318, 403, and 405(a) and (b) of the Federal act. However, a permit may be modified, revoked and reissued,
or terminated during its term for cause as set forth in Section 61.8(8) of the Colorado Discharge Permit
System Regulations.
d. Compliance with a permit condition which implements a particular standard for sewage sludge use or
disposal shall be an affirmative defense in any enforcement action brought for a violation of that standard
for sewage sludge use or disposal.
Page 1 of 10
4300 Cherry Creek Drive S., Denver, CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe/wqcd
APPLICATION GUIDANCE DOCUMENT
COLORADO DISCHARGE PERMIT SYSTEM (CDPS) General Permits:
Construction Dewatering (COG070000)
Remediation Activities Discharging To Surface Water (COG315000), or
Remediation Activities Discharging To Groundwater (COG316000)
Contents
A. PERMIT INFORMATION .................................................................................................................. 2
Table 1: Locations of Potential Groundwater Contamination .................................................................. 2
Table 2: General Permit Descriptions and Information .......................................................................... 3
B. CONTACT INFORMATION ............................................................................................................... 5
C. PERMITTED FACILITY INFORMATION ................................................................................................. 5
D. PROJECT DESCRIPTION ................................................................................................................. 5
E. ADDITIONAL INFORMATION ............................................................................................................ 7
F. REQUIRED CERTIFICATION SIGNATURE [Reg. 61.4(1)(h)] ........................................................................ 7
APPENDIX A: Information for Submitting Required Data ......................................................................... 8
APPENDIX B: Resources for Determining Groundwater Contamination Potential ........................................... 9
APPENDIX C: Division Determination Using the Application Information and Data ....................................... 10
This guidance is designed to assist in completing the application for processing each of the three permit types listed
above. The Water Quality Control Division may request additional information and characterization of the proposed
discharge to ensure that the appropriate permit coverage is requested and the appropriate permit certification is
issued. The division may deny or change the requested type of discharge permit after review of the submitted
application and will notify the applicant of the changes. Please note:
Coverage under the “Subterranean Dewatering or Well Development” General Permit (COG6030000) is not
available using this permit application form.
The discharge of contaminated groundwater to an impoundment is regulated by the Solid Waste Program in the
Hazardous Materials and Waste Management Division, and also cannot be covered under any of the above
permits.
The discharge of uncontaminated groundwater to land may be discharged under the division’s Low Risk
Discharge Guidance: Discharges of Uncontaminated Groundwater to Land as an alternative to obtaining
coverage to discharge under this permit. The low risk policy is available for download at
www.coloradowaterpermits.com.
As provided in General Permit COR030000, the discharge of uncontaminated groundwater to land may also be
discharged under an exisiting construction stormwater permit where permit conditions are met.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 2 of 10
A. PERMIT INFORMATION
Reason for Application: Indicate whether this is an application for a new certification or if you are renewing an
existing certification (as required prior to the expiration date of an existing general permit or certification). If you
are renewing an existing certification, please provide the existing permit certification number.
Applicant is: Indicate the entity that will hold (be legally responsible for) the permit.
Application is for the following discharge permit (select ONE): In order to determine whether your project
qualifies for coverage under a construction dewatering general permit (COG070000) or requires a remediation
general permit (COG315000 or COG316000), you must determine whether there are known sources of groundwate r
contamination located in the vicinity of your project site. Where nearby sources of groundwater contaminations
are identified, you will need to determine whether your project has the potential to draw -in contaminated
groundwater. The best way to make this determination is to use the criteria in Table 1 below to determine if your
project site is located in the vicinity of potential ground water contamination. If so, collect a sample of
groundwater from your project site (i.e., water that is representative of the water you propose to discharge).
Then, use Table 1 to determine what parameters to include in your analysis, have it analyzed for those parameters
described, and submit the data with your permit application.
Table 1: Locations of Potential Groundwater Contamination
Is Your Project Site Located in the Vicinity of Potential Groundwater Contamination? 1
Project Location Relative to a Source of
Potential Groundwater Contamination
Analytical Data Likely to be
Required with the Permit
Application
Within 0.25 mile of an open Leaking Underground Storage Tank (LUST) site
(Note that closed LUSTs are assumed to pose a low risk for potential
groundwater contamination and, therefore, the submission of analytical
data based on proximity to a closed LUST is not required)
BTEX only
Within 0.5 mile of an open Voluntary Cleanup (VCUP) site
All parameters listed in Attachment 1
of the permit application (or an
alternate list approved by the
division)2
Within 0.5 mile of an Environmental Covenant
Within 0.5 mile of an open Resource Conservation Recovery Act (RCRA)
Corrective Action Site
Within 1.0 mile or more of a Superfund site or National Priorities List (NPL)
site with associated groundwater contamination
1 This table provides examples of sources of contamination. Other types and sources of potential groundwater
contamination may exist.
2 Analyze a groundwater sample that is representative of the water you propose to discharge for the parameters of
concern for the project areas (i.e., total, dissolved, potentially dissolved). This may be a subset of Attachment 1 in the
permit application. Note this subset list must be approved by the division. See Important Notes in Appendix A at the
end of this guidance for more information on this topic.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 3 of 10
Information regarding the locations of the various types of contaminated sites (LUST, VCUP, Environmental Covenants,
RCRA Corrective Action, or Superfund) may be found in Appendix B of this document.
Once you have determined if your project site is located in the vicinity of potential groundwater contamination, use
the flowchart on the following page to help determine the appropriate permit coverage for your discharge.
Table 2 below supplements the selection process by providing possible groundwater contamination scenarios and
general permit descriptions and coverage. Select the one type of permit coverage most appropriate for this project.
Please note that one application is intended to cover one project and one type of permit. Where multiple projects or
types of permits are required, you must submit an appropriate number of permit applications.
Table 2: General Permit Descriptions and Information1
Construction Dewatering
(COG70000)
Remediation Activities
Discharging to Surface Waters
(COG315000)
Remediation Activities
Discharging to Ground Water
(COG316000)
Covered
Discharges
Uncontaminated source
water OR Contaminated (by
BTEX only) source water2
that has come into contact
with construction activities
Discharges from treatment
and/or remedial activities of
contaminated groundwater,
alluvial water, stormwater,
and/or surface water (which may
be associated with construction
activities)
Discharges from treatment
and/or remedial activities of
contaminated groundwater,
alluvial water, stormwater,
and/or surface water (which
may be associated with
construction activities)
Discharge
Location
To surface water and/or to
land with potential
percolation to groundwater
To surface water or land with
potential percolation to
groundwater hydrologically
connected to surface water
To land with the potential to
percolate to groundwater not
hydrologically connected to
surface water
Applicant
Requirements
BTEX3 Analysis (if within one
quarter mile of an open
LUST)
Influent Screening4 Influent Screening
Division
Authorization
Discharges under this permit
will not be authorized if
pollutants may be present in
the source water in
concentration greater than
a numeric water quality
standard of the receiving
water
Discharges under this permit may
be authorized if pollutants may
be present in the source water in
concentration greater than a
numeric water quality standard
of the receiving water
Discharges under this permit
may be authorized if pollutants
may be present in the source
water in concentration greater
than a numeric water quality
standard of the receiving water
1 The Division may deny or change the requested type of discharge permit after review of the submitted application
and will notify the applicant of the changes.
2 Source Water: Groundwater, surface water, alluvial water, or stormwater mixed with groundwater and/or surface
water
3 BTEX: Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) are common pollutants found in petroleum based products
4 See Attachment 1 in the permit application packet
Additional information and resources for identification of contaminated groundwater and sampling procedures can be
found in this guidance document:
APPENDIX A: Information for Completing Analyticals Required
APPENDIX B: Resources for Determining Groundwater Contamination Potential
APPENDIX C: Division Determination Using the Application Information and Data
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 4 of 10
*One-half the water quality standard is a general comparison. This may vary on a case by case basis resulting in different permit coverage than what is stated
above.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 5 of 10
B. CONTACT INFORMATION
Provide the required contact information. Note that the person listed as the Permittee (Responsible Position) must
also be the person that signs and certifies the permit application. This person receives all permit correspondences
and is legally responsible for compliance with the permit.
Note that the person listed as the DMR Cognizant Official will receive all pre-printed discharge monitoring report
(DMR) forms associated with the permit.
C. PERMITTED FACILITY INFORMATION
Provide the required facility information.
Facility or Project Latitude/Longitude: The following definitions are based on text from the EPA Data Standard.
Horizontal Collection Method: Describes the method used to determine the latitude and longitude
coordinates for a point on the earth. This specifies what type of method or device was used to identify the
latitude and longitude, e.g., a Global Positioning System (GPS) device, Google Earth, an address, an
intersection, a census block centroid, etc. The key is that the horizontal collection method determines how
the coordinates were collected, not where.
Reference Point: The text that identifies the place for which the geographic coordinates were established.
This specifies the location at the place where the coordinates were taken, e.g., entrance to a facility,
center of a facility, etc. The key is that the reference point determines where the coordinates were
collected, not how.
Horizontal Reference Datum: The horizontal reference datum is the coordinate reference system to which
the latitude/longitude data relate. Per EPA's Latitude/Longitude Data Standard, there are three possible
values associated with horizontal reference datum. Horizontal reference datum possible responses are as
follows:
o North American Datum of 1927 (NAD27): If you are reporting a location using a USGS 7.5 -minute
map, NAD27 is your default datum.
o North American Datum of 1983 (NAD83): NAD83 updated NAD27 with current measurements using
radio astronomy and satellite observations. When the USGS began publishing digital data, the NAD83
was used, which provided a more accurate representa tion of the earth’s shape and a more accurate
depiction of the location of objects on the earth.
o World Geodetic System of 1984 (WGS84): If you used a GPS or Google Earth to calculate your
latitude/longitude coordinates, WGS84 is the default datum.
Standard Industrial Classification (SIC) Code(s) for this Facility: Standard Industrial Classification (SIC) codes are
four digit numerical codes assigned by the U.S. government to business establishments to identify the primary
business of the establishm ent. SIC codes can be obtained at: https://www.osha.gov/pls/imis/sicsearch.html. The
most common SIC code for businesses conducting construction-related work is 1799: Special Trade Contractors,
Not Elsewhere Classified. This includes dewatering contractors.
D. PROJECT DESCRIPTION
D.1 Description of Activity and D.2 Description of Discharge: Provide thorough and detailed responses to the
questions in these sections in order to facilitate and expedite the review and processing of your application.
Note that “in-stream” work is:
o Conducted within approximately the ordinary high water mark* of the stream, and/or
o Conducted on the bank of the stream, and
o potentially including subsurface flow to the stream.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 6 of 10
* “The term ordinary high water mark means that line on the shore established by the fluctuations of water
and indicated by physical characteristics such as a clear, natural line impressed on the bank, shelving, changes
in the character of soil, destruction of terrestrial vegetation, the presence of litter and debris, or other
appropriate means that consider the characteristics of the surrounding area.”
(Taken directly from USACE Regulatory Guidance Letter “Ordinary High Water Mark Identification” dated
12/07/2005)
D.3 Discharge Outfalls: “Outfalls” refer to the physical location where the dewatering effluent is released. This
outfall location may be different from the source water location. For example, you may dewater your project site
by pumping water from the excavation (the source), through any best management practice or treatment to the
point the water is released (the outfall), and into the nearby stream, storm sewer, etc. This portion of the permit
application requires information regarding your outfall location(s).
What is a defined outfall versus an undefined outfall?
The permit application requires that you specify whether the outfall is defined or undefined.
A defined outfall has a known location, specified by latitude and longitude at the time of permit
application. Where defined outfalls are requested, the division will mail DMRs that include the specified
location information. Permittees often find this information helpful in managing their DMRs, and submitting
the correct DMR form for the outfall location.
An undefined outfall has an unknown location at the time of permit application. Undefined outfalls are only
available for construction dewatering (COG07000, Part I.B.1). In this case the specific location for each
discharge is established by the permittee at the time the discharge commences, and may not be changed
once established. Permittees are responsible for making sure that the same DMR (for example the DMR
labeled “Outfall 001A”) is always used for the same outfall sampling location. A single DMR cannot be used
for multiple locations in the field. Undefined outfalls provide flexibility during construction activities;
however, they may be difficult to manage and the most stringent water quality standards for all potentially
impacted streams are applied to all discharge outfalls.
What is the maximum number of outfalls that I can request?
You are allowed to request up to 20 defined outfalls and 20 undefined outfalls in one permit application. Undefined
outfalls are only available for construction dewatering. Where your project requires additional outfalls, you may
request a modification to your permit certification to add additional outfalls.
Is this a discharge to surface water or to land with the potential to percolate to groundwater?
The permit application requires that you specify whether the outfall is a discharge is to surface water or to land
with the potential to percolate to ground water.
A discharge to surface water can occur directly or through a conveyance such as a ditch or a storm sewer
system.
A discharge to groundwater occurs through land application and/or through discharge to a sediment basin
with percolation to groundwater.
If your discharge is to a sediment basin and the basin overtops, the division may determine that your
discharge is to both surface water and groundwater, and will include appropriate permit limitations for both
surface water and groundwater in your permit certificatio n.
How do I estimate the maximum flowrate?
The estimated maximum discharge flow rate must be provided in order for the division to process the permit
application. In order to estimate your maximum flow rate, you might consider the maximum capacity of the pumps
at your site and the total number of pumps that can be operating together at one ex cavation. For stream
diversions, you might estimate the maximum flow rate of the stream around your work activity. For remediation
projects where treatment is in place, estimate the maximum flow rate appropriate for your treatment system.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 7 of 10
The Division will apply your flow information in your permit certification as follows:
For construction dewatering, the acute flow limit (i.e., maximum flow limitation) will be equal to twice the
estimated maximum rate flow rate provided in the permit application.
For groundwater remediation, both the acute flow limit (i.e., maximum flow limitation) and the chronic
flow limit (i.e., 30-day average flow limitation) will be based on the design capacity of the treatment as
provided in the permit application.
Where will the sampling occur?
Per the general permit, discharge points shall be designed or modified so that a sample of the effluent can be
obtained at a point after the final treatment process and prior to discharge to state waters. All samples must be
taken at the monitoring points specified in this permit and, unless otherwise specified, before the effluent joins or
is diluted by any other waste stream, body of water, or substance. Monitoring points cannot be changed without
notification to and approval by the division. The permittee must provide access to the division to sample the
discharge at these points.
E. ADDITIONAL INFORMATION
E.1 Nearby Sources of Potential Groundwater Contamination: In this portion of the application, you are required
to document the results of your due diligence efforts, including whether or not you identified potential sources of
groundwater contamination in the vicinity of your project. Information to help you complete this portion of the
application was provided in the flowchart a nd tables above, as well as in Appendix A-C of this guidance document.
E.2 Chemical Additions: List any chemicals to be used in, or applied to, waters that may be discharged. Include a
copy of each chemical’s current Material Safety Data Sheet. All chemicals used in waters that may be discharged
must be approved by the division.
E.3 Site Maps and Schematics: The complete application must include these maps and site sketches.
WATER RIGHTS
The permittee is responsible for contacting the State Engineers Office as appropriate. Issuance of a CDPS permit
does not negate the need to also have the necessary water rights in place. It is also important to understand that
even if the activity has an existing CDPS permit, there is no guarantee that the p roper water rights are in place.
F. REQUIRED CERTIFICATION SIGNATURE [Reg. 61.4(1)(h)]
The application must be signed by the responsible party in order to be processed by the Division. An original (wet)
signature is required on the permit application submitted to the division.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 8 of 10
APPENDIX A: Information for Submitting Required Data
A list of required parameters to be sampled for is found in Attachment 1 of the permit application. (See important
notes.)
Unless otherwise indicated by the division, all influent screening must adhere to the following stipulations:
Metals analyses must be performed for the analytical form (total recoverable, potentially dissolved, and/or
dissolved) identified in Attachment 1 of the permit application.
Analytical methods for metals must measure below or equal to the practical quantitation limit (PQL) identi fied
in Attachment 1 of the permit application.
Analytical methods and PQLs selected for all parameters must be in accordance with the criteria established in
the permit application.
The sample collected must be representative of the source water.
IMPORTANT NOTES:
Alternate List of Parameters: Where the applicant can identify the parameters associated with the source of
potential groundwater contamination, the applicant may contact the division to request approval to analyze
only for those parameters, and to submit data for only those parameters with the permit application.
In lieu of submitting analytical data, you may choose to demonstrate that your site is not likely to be impacted
by nearby sources of contamination by submitting other relevant information with your permit application for
review and consideration by the division. For example, you may submit information regarding the geology and
hydrogeology of the site, groundwater flow direction, or historic groundwater data. This information must be
accompanied by a narrative discussion of how and why this information shows that groundwater at your project
site is not likely to be contaminated. The division will review this information, and determine if it is sufficient
to demonstrate that groundwater at the site is not likely to be contam inated. Where the division finds the
information to be insufficient, the division will require additional data or information, potentially delaying the
processing of the permit.
Applicants applying under the General Permit for Remediation Activities Discharging to Groundwater
(COG316000) are encouraged to contact the division prior to sample collection to ensure that the correct metal
speciation is included in the sample analysis.
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 9 of 10
APPENDIX B: Resources for Determining Groundwater Contamination Potential
The following resources are available for determining if contaminated groundwater may be located near your project
site:
Leaking Underground Storage Tanks (LUSTs): Oil and Public Safety (OPS) COSTIS database (Storage Tank
Database). Search for events by city, county, or zip code on the OPS website.
o https://www.colorado.gov/pacific/ops/PetroleumMaps
Superfund Sites: The CDPHE HMWMD maintains a list of active Superfund sites on its website. The division may
require data even if your site is greater than one-mile from a Superfund site, based on the nature and extent of
contamination at these sites.
o https://www.colorado.gov/pacific/cdphe/superfund-sites
o https://www.colorado.gov/pacific/cdphe/hm-gis-data
National Priorities List (NPL) sites: The U.S. Environmental Protection Agency maintains a list of national
priorities sites on their website.
o https://www.epa.gov/superfund/national-priorities-list-npl-sites-state#CO
Voluntary Cleanup Sites (VCUPs): The CDPHE Hazardous Materials and Waste Management Division (HMWMD)
maintains a list of VCUPs by County. Visit the HMWMD website, and select the “Voluntary Cleanup Sites
Grouped by County” list at the top of the page.
o https://www.colorado.gov/pacific/cdphe/voluntary-cleanup
o https://www.colorado.gov/pacific/cdphe/hm-gis-data
Environmental Covenants: Environmental Covenant Sites are listed on the CDPHE HMWMD website. The county
the site is located in and a map of the contaminated area are provided on this webpage.
o https://www.colorado.gov/pacific/cdphe/hmcovenants
o https://www.colorado.gov/pacific/cdphe/hm-gis-data
RCRA Corrective Action Sites: The U.S. Environmental Protection Agency maintains a list of RCRA Hazardous
Waste Corrective Action sites in Colorado that are undergoing or potentially undergoing groundwater
remediation.
o https://www.epa.gov/cleanups/cleanups-my-community
o Visit the CDPHE’s Hazardous Waste Corrective Action Unit Contacts for more information on a
corrective action site.
Brownfield Sites: The CDPHE HMWMD maintains a list of active Superfund sites on its website.
o https://www.colorado.gov/pacific/cdphe/brownfields
o https://www.colorado.gov/pacific/cdphe/hm-gis-data
COG070000/COG315000/COG316000 Discharge Permit Application Guidance www.coloradowaterpermits.com
Page 10 of 10
APPENDIX C: Division Determination Using the Application Information and Data
As a general rule of thumb, the division will make an initial determination of appropriate permit coverage based
largely on the proximity of your project site to known sources of contamination and the potential to draw -in the
contaminated groundwater. The division will then review analytical data and information submitted with the
application, along with any additional information available to the division, to determine whether your project has the
potential to draw-in contaminated groundwater and to verify that you have selected the correct permit coverage for
your project. Where analytical data is included with the permit application, the division will conservatively compare
the maximum detected concentration of each detected constituent to one -half the applicable water quantity standard
to determine if there is reasonable potential for a pollutant in the source water to exceed a water quality standard of
the receiving water.
For project sites where no known potential sources of contamination are located within one mile of the project
site AND the permit applicant has no other information which would indicate that the discharge may be
contaminated:
o No source water analytical data is required with the permit application.
These projects will typically be permitted under Construction Dewatering (COG070000)
For project sites where known potential sources of BTEX contamination (i.e. LUSTs) are located within one-
quarter mile of the project site:
o BTEX data is required with the application, unless the applicant can provide other information
indicating there is no reasonable potential for BTEX to contribute pollutants to the source water.
Where the data shows that the source water does not contain concentrations of BTEX greater
than ½ the water quality standards of the receiving water, the project may be permitted
under Construction Dewatering (COG070000).
Where the data show that the source water does contain concentrations of BTEX greater than
½ the water quality standards of the receiving water, the project may be permitted under
Remediation Activities Discharging to Surface Water (COG315000) or Remediation Activities
Discharging to Groundwater (COG316000), or an individual permit as applicable.
For project sites where other known potential sources of contamination are located within one mile of the
project site:
o Pre-screening data (see Attachment 1 of the application) is required, unless the applicant can provide
other information indicating that there is no reasonable potential for the contamination to contribute
pollutants to the source water being discharged.
Where the data show that the source water does contain concentrations of potential pollutants
from the contamination source that are greater than ½ the water quality standards of the
receiving water, the project may be permitted under Remediation Activities Discharging to
Surface Water (COG315000) or Remediation Activities Discharging to Groundwater
(COG316000), or an individual permit as applicable.
The flowchart in this guidance summarizes the above detailed process used by the division for evaluating dat a and
determining appropriate permit coverage. Note that other factors may be considered outside of these guidelines,
resulting in the need for additional information to supplement the permit application.
MULBERRY CONNECTION │SWMP REPORT
APPENDIX D – EXAMPLE LOGS
Outdoor Storage of Materials Log
Identification
of Pollutant
Date
Onsite
Date
Removed
Containment
Method
Vehicle Equipment Maintenance and Fueling Log
Identification
of Pollutant
Date
Onsite
Date
Removed
Containment
Method
Routine Maintenance Log
Identification
of Pollutant
Date
Onsite
Date
Removed
Containment
Method
Onsite Waste Management Log
Identification
of Pollutant
Date
Onsite
Date
Removed
Containment
Method
Non-Industrial Waste Sources Log
Identification
of Pollutant
Date
Onsite
Date
Removed
Containment
Method
Additional Pollutant Sources Log
Identification
of Pollutant
Date
Onsite
Date
Removed
Containment
Method
Control Measure Name
Description
Implementation
Installation Procedures
Inspection Expectations
Describe the control measure and what pollutant sources it will provide effective treatment for (part I.C.2.a.iv of the
permit). Include the mechanism used for treatment of the pollutant source.
Describe how the control measure will be implemented in accordance with good engineering, hydrologic and
pollution control practices. Include the phase(s) of construction the control measure will be implemented for.
Describe the process required to install the control measure and have it adequately treat the intended pollutant
source. Include specific depths, lengths, materials, and any other applicable information necessary to properly install
the control measure.
Describe how often the control measure will be inspected and what key features should be checked during each
inspection (is the silt fence tail entrenched, are the straw wattles staked ever 4 feet, etc.)
Control Measure Name
Maintenance Requirements
Control Measure Diagram
Describe maintenance requirements, such as how to repair damaged sections, what qualifies as a failed control
measure and when it needs to be replaced. Also include criteria that would trigger maintenance (i.e. 50% capacity of
the control measure has been reached).
Land Disturbance / BMP Installation / Stabilization Log
Date
Initiated Description of Activity Date
Ceased Identification of BMP / Stabilization Method Date
Implemented
Date
Removed
Land Disturbance / Control Measure Installation / Stabilization Log
Identification of Control Measure / Stabilization
Method
CONSTRUCTION STORMWATER SITE INSPECTION REPORT
Facility Name Permittee
Date of Inspection Weather Conditions
Permit Certification # Disturbed Acreage
Phase of Construction Inspector Title
Inspector Name
Is the above inspector a qualified stormwater manager?
(permittee is responsible for ensuring that the inspector is a qualified stormwater manager)
YES NO
INSPECTION FREQUENCY
Check the box that describes the minimum inspection frequency utilized when conducting each inspection
At least one inspection every 7 calendar days
At least one inspection every 14 calendar days, with post-storm event inspections conducted within
24 hours after the end of any precipitation or snowmelt event that causes surface erosions
• This is this a post-storm event inspection. Event Date: _____________________
Reduced inspection frequency - Include site conditions that warrant reduced inspection frequency
• Post-storm inspections at temporarily idle sites
• Inspections at completed sites/area
• Winter conditions exclusion
Have there been any deviations from the minimum inspection schedule?
If yes, describe below.
YES NO
INSPECTION REQUIREMENTS*
i. Visually verify all implemented control measures are in effective operational condition and are working as
designed in the specifications
ii. Determine if there are new potential sources of pollutants
iii. Assess the adequacy of control measures at the site to identify areas requiring new or modified control measures
to minimize pollutant discharges
iv. Identify all areas of non-compliance with the permit requirements, and if necessary, implement corrective action
*Use the attached Control Measures Requiring Routine Maintenance and Inadequate Control Measures Requiring
Corrective Action forms to document results of this assessment that trigger either maintenance or corrective actions
AREAS TO BE INSPECTED
Is there evidence of, or the potential for, pollutants leaving the construction site boundaries, entering the stormwater
drainage system or discharging to state waters at the following locations?
NO YES
If "YES” describe discharge or potential for discharge below.
Document related maintenance, inadequate control measures
and corrective actions Inadequate Control Measures
Requiring Corrective Action form
Construction site perimeter
All disturbed areas
Designated haul routes
Material and waste storage areas
exposed to precipitation
Locations where stormwater has the
potential to discharge offsite
Locations where vehicles exit the site
Other: ____________________
CONTROL MEASURES REQUIRING ROUTINE MAINTENANCE
Definition: Any control measure that is still operating in accordance with its design and the requirements of the permit, but requires maintenance to prevent a
breach of the control measure. These items are not subject to the corrective action requirements as specified in Part I.B.1.c of the permit.
Are there control measures requiring maintenance? NO YES
If “YES” document below
Date
Observed Location Control Measure Maintenance Required Date
Completed
INADEQUATE CONTROL MEASURES REQUIRING CORRECTIVE ACTION
Definition: Any control measure that is not designed or implemented in accordance with the requirements of the permit and/or any control measure that is not
implemented to operate in accordance with its design. This includes control measures that have not been implemented for pollutant sources. If it is infeasible
to install or repair the control measure immediately after discovering the deficiency the reason must be documented and a schedule included to return the
control measure to effective operating condition as possible.
Are there inadequate control measures requiring corrective action? NO YES
If “YES” document below
Are there additional control measures needed that were not in place at the time of inspection? NO YES
If “YES” document below
Date
Discovered Location Description of Inadequate
Control Measure Description of Corrective Action
Was deficiency corrected when
discovered? YES/NO
if “NO” provide reason and schedule to correct
Date
Corrected
REPORTING REQUIREMENTS
The permittee shall report the following circumstances orally within twenty-four (24) hours from the time the permittee becomes aware of the circumstances,
and shall mail to the division a written report containing the information requested within five (5) working days after becoming aware of the following
circumstances. The division may waive the written report required if the oral report has been received within 24 hours.
All Noncompliance Requiring 24-Hour Notification per Part II.L.6 of the Permit
a. Endangerment to Health or the Environment
Circumstances leading to any noncompliance which may endanger health or the environment regardless of the cause of the incident (See Part II.L.6.a
of the Permit)
This category would primarily result from the discharge of pollutants in violation of the permit
b. Numeric Effluent Limit Violations
o Circumstances leading to any unanticipated bypass which exceeds any effluent limitations (See Part II.L.6.b of the Permit)
o Circumstances leading to any upset which causes an exceedance of any effluent limitation (See Part II.L.6.c of the Permit)
o Daily maximum violations (See Part II.L.6.d of the Permit)
Numeric effluent limits are very uncommon in certifications under the COR400000 general permit. This category of noncompliance only applies if
numeric effluent limits are included in a permit certification.
Has there been an incident of noncompliance requiring 24-hour notification? NO YES
If “YES” document below
Date and
Time of
Incident
Location Description of
Noncompliance Description of Corrective Action
Date and Time of
24 Hour Oral
Notification
Date of 5 Day Written
Notification *
*Attach copy of 5 day written notification to report. Indicate if written notification was waived, including the name of the division personnel who granted waiver.
After adequate corrective action(s) and maintenance have been taken, or where a report does not identify
any incidents requiring corrective action or maintenance, the individual(s) designated as the Qualified
Stormwater Manager, shall sign and certify the below statement:
“I verify that, to the best of my knowledge and belief, all corrective action and maintenance items identified
during the inspection are complete, and the site is currently in compliance with the permit.”
______________________________________ _______________________________________
Name of Qualified Stormwater Manager Title of Qualified Stormwater Manager
______________________________________ _______________________________________
Signature of Qualified Stormwater Manager Date
Notes/Comments
BMP Corrective Action Log
Date
Identified Inspector Description of BMP Deficiency Corrective Action Taken Date
Completed
Control Measure Corrective Action Log
Description of Control Measure Deficiency
MULBERRY CONNECTION │SWMP REPORT
APPENDIX E – SPILL REPORTING
Five day reporting form
Incident / spill / sanitary sewer overflow release
Use this form to report i ncidents impacting waters of the state
The Water Quality Control Division distinguishes between reporting requirements for incidents that occur at entities
operating under a Colorado Discharge Permit System (CDPS) permit and those resulting from non-permitted activities.
Permitted activities - Reporting and management of non-compliance incidents and spills that occur as a result of
permitted activities should be performed in accordance with the specific requirements in the notifications section of
your permit. You may use this form to submit the information requested in the permit.
Non-permitted activities - In the case of an activity where a permit does not address reporting of, or response to, a
given spill please submit a written summary of the event, your response, and clean up efforts to the division within five
working days of the date of the event. This form is provided for your convenience. If you have any questions please
contact the division’s field s ervices staff person assigned to your spill case.
Prior to the five working day deadline you may request an extension to submit the report if needed for sampling
analysis or other reasons. To request an extensi on please send an email to the division’s field s ervices staff person
assigned to your spill cas e or to the spill administrator. The field services contact list is available at:
www.colorado.gov/cdphe/wq-inspection-services-contact-us.
Please send the completed form or report with signature to the division’s field services spill administrator:
Michelle Thiebaud
222 S. Sixth Street, 232
Grand Junction, CO 81501
Telephone: 970-248-7150
Fax: 970-248-7198
Email: michelle.thiebaud@state.co.us
1. Incident background information
Incident/spill number
(division provided) Date of
event County
Type of incident / s pill / SSO (check one)
☐ Sanitary sewer overflow ☐ Potable water /reuse water /
reclaimed water
☐ Biosolids
☐ W astewater treatment plant bypass or
upset (authorized outfall point)
☐ Petroleum product ☐ Oil or gas field production s pill
☐ W astewater t r eatment plant spill or
overflow (other than outfall)
☐ Chemical ☐ Other
Estimated v olume r eleased
Size and depth of area affected
Contact information
Potentially responsible party contact name
Potentially r esponsible party company/agency name
CDPHE Permit number and facility name (if applicable)
Email a ddress Phone
2. Incident information: Please provide the following information.
A. Describe incident including source, cause, and location (e.g. address, latitude/longitude).
B. Material released, e.g. untreated wastewater, specific chemical or produc t , biosolids . Please attach the OSHA Material Safety
Data Sheets for any and all chemicals or products in spill or release.
Revised November 2017
C. Actual or estimated duration of the event and time spill was fully controlled/stopped. If release is still occurring, the date
and time the release is expected to be stopped.
D. Describe measures taken or planned to contain, reduce, and clean up spill or release.
E. Describe s teps taken or planned to prevent reoccurrence.
3. Incident impact to state w aters (As defined in § 25-8-103(19), C.R.S.).
Examples of state waters include: stormwater conveyances (when they discharge to surface water), perennial streams,
intermittent or ephemeral gulches, ditches, ponds, lakes, reservoi rs, irrigation canals, wetlands and groundwater.
A. Did flow or materials reach surface water of the s tate? If so, identify the water body or bodies and describe the path of flow.
W hat quantity of material reached the surface waters and what was the resulting impact?
B. Did flow or materials reach groundwater of the s tate? If so, identify the water body or bodies and describe the path of flow.
If yes, what quantity of material reached the ground or groundwater and what was the resulting impact?
C. Did the incident include any of the following? If so, please include additional details below.
☐ Chemical r elease ☐ Fish k ill ☐ Sheen on water
D. Were any water quality samples or other samples taken? If so, please describe sampling process , sampling location(s) in
relationship to the incident, i.e. up/down stream and attach results.
4. Incident impact to areas or water u sers
A. Describe the potential impact of the incident /spill/SSO to public use areas or downstream water users. This includes parks
and swim beaches or public water s ystem sources and irrigation diversions .
B. W ere the impacted area users and downstream water users notified and describe the method of notification , e.g. signs
posted, via phone.
C. List any downstream users who were notified.
I hereby certify that the information presented above is accurate and complete.
Signature Name and title Company, o rganization Date
MULBERRY CONNECTION │SWMP REPORT
APPENDIX F – CONTROL MEASURE DETAILS
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SR-1. Surface roughening via imprinting for temporary
stabilization.
Description
Surface roughening is an erosion control
practice that involves tracking,
scarifying, imprinting, or tilling a
disturbed area to provide temporary
stabilization of disturbed areas. Surface
roughening creates variations in the soil
surface that help to minimize wind and
water erosion. Depending on the
technique used, surface roughening may
also help establish conditions favorable
to establishment of vegetation.
Appropriate Uses
Surface roughening can be used to
provide temporary stabilization of
disturbed areas, such as when
revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening
is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls.
Surface roughening is often implemented in conjunction with grading and is typically performed using
heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also
compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are
better surface roughening techniques in locations where revegetation is planned. Roughening is not
effective in very sandy soils and cannot be effectively performed in rocky soil.
Design and Installation
Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and
SR-2, respectively.
Surface roughening should be performed either after final grading or to temporarily stabilize an area
during active construction that may be inactive for a short time period. Surface roughening should create
depressions 2 to 6 inches deep and approximately 6 inches apart. The surface of exposed soil can be
roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the
contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or
tilling.
Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be
roughened as a subsequent operation. Roughening should follow along the contours of the slope. The
tracks left by truck mounted equipment working perpendicular
to the contour can leave acceptable horizontal depressions;
however, the equipment will also compact the soil.
Surface Roughening
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-1 Surface Roughening (SR)
SR-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Care should be taken not to drive vehicles or equipment over areas that have been surface roughened.
Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies.
Because surface roughening is only a temporary control, additional treatments may be necessary to
maintain the soil surface in a roughened condition.
Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not
provide long-term erosion control.
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-3
Urban Storm Drainage Criteria Manual Volume 3
EC-1 Surface Roughening (SR)
SR-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of
Douglas County.
Description
Temporary seeding can be used to
stabilize disturbed areas that will be
inactive for an extended period.
Permanent seeding should be used to
stabilize areas at final grade that will not
be otherwise stabilized. Effective seeding
includes preparation of a seedbed,
selection of an appropriate seed mixture,
proper planting techniques, and protection
of the seeded area with mulch, geotextiles,
or other appropriate measures.
Appropriate Uses
When the soil surface is disturbed and
will remain inactive for an extended
period (typically 30 days or longer),
proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order
of two weeks), techniques such as surface roughening may be appropriate. For longer periods of
inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding
should be used on finished areas that have not been otherwise stabilized.
Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional
requirements for seeding and temporary stabilization.
Design and Installation
Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of
appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric
until plants are established.
The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding
and mulching recommendations that may be referenced to supplement this Fact Sheet.
Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where
steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand
seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot
grading can result in loss of topsoil, resulting in poor quality
subsoils at the ground surface that have low nutrient value,
little organic matter content, few soil microorganisms,
rooting restrictions, and conditions less conducive to
infiltration of precipitation. As a result, it is typically
necessary to provide stockpiled topsoil, compost, or other
Temporary and Permanent Seeding
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
soil amendments and rototill them into the soil to a depth of 6 inches or more.
Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later.
Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its
water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content.
The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across
areas that will be revegetated.
Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth
medium. Organic matter, such as well digested compost, can be added to improve soil characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil
testing, which is typically inexpensive, should be completed to determine and optimize the types and
amounts of amendments that are required.
If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding
compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement
of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth.
Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose
nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth
and conducive to plant growth. Seed-to-soil contact is the key to good germination.
Seed Mix for Temporary Vegetation
To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully
landscaped or worked for an extended period (typically 30 days or more), plant an annual grass
appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver
metropolitan area are listed in Table TS/PS-1. These are to be considered only as general
recommendations when specific design guidance for a particular site is not available. Local governments
typically specify seed mixes appropriate for their jurisdiction.
Seed Mix for Permanent Revegetation
To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should
be established. Permanent seeding should be performed promptly (typically within 14 days) after
reaching final grade. Each site will have different characteristics and a landscape professional or the local
jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a
specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth
season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended
in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding
equipment.
If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus
nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be
added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii),
plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled
upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen
for perennial grasses.
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-3
Urban Storm Drainage Criteria Manual Volume 3
Seeding dates for the highest success probability of perennial species along the Front Range are generally
in the spring from April through early May and in the fall after the first of September until the ground
freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Speciesa
(Common name)
Growth
Seasonb
Pounds of
Pure Live Seed
(PLS)/acrec
Planting
Depth
(inches)
1. Oats Cool 35 - 50 1 - 2
2. Spring wheat Cool 25 - 35 1 - 2
3. Spring barley Cool 25 - 35 1 - 2
4. Annual ryegrass Cool 10 - 15 ½
5. Millet Warm 3 - 15 ½ - ¾
6. Sudangrass Warm 5–10 ½ - ¾
7. Sorghum Warm 5–10 ½ - ¾
8. Winter wheat Cool 20–35 1 - 2
9. Winter barley Cool 20–35 1 - 2
10. Winter rye Cool 20–35 1 - 2
11. Triticale Cool 25–40 1 - 2
a Successful seeding of annual grass resulting in adequate plant growth will
usually produce enough dead-plant residue to provide protection from
wind and water erosion for an additional year. This assumes that the cover
is not disturbed or mowed closer than 8 inches.
Hydraulic seeding may be substituted for drilling only where slopes are
steeper than 3:1 or where access limitations exist. When hydraulic
seeding is used, hydraulic mulching should be applied as a separate
operation, when practical, to prevent the seeds from being encapsulated in
the mulch.
b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied,
may extend the use of cool season species during the summer months.
c Seeding rates should be doubled if seed is broadcast, or increased by 50
percent if done using a Brillion Drill or by hydraulic seeding.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Commona
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum
'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum
'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-5
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.)
Common
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Sandy Soil Seed Mix
Blue grama Bouteloua gracilis Warm Sod-forming
bunchgrass 825,000 0.5
Camper little bluestem Schizachyrium scoparium
'Camper' Warm Bunch 240,000 1.0
Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0
Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25
Vaughn sideoats grama Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 10.25
Heavy Clay, Rocky Foothill Seed Mix
Ephriam crested wheatgrassd Agropyron cristatum
'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium
'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats gramae Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped hay or straw mulch. These rates
should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is
applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1.
If hydraulic seeding is used, hydraulic mulching should be done as a separate operation.
b See Table TS/PS-3 for seeding dates.
c If site is to be irrigated, the transition turf seed rates should be doubled.
d Crested wheatgrass should not be used on slopes steeper than 6H to 1V.
e Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses
(Numbers in table reference
species in Table TS/PS-1)
Perennial Grasses
Seeding Dates Warm Cool Warm Cool
January 1–March 15
March 16–April 30 4 1,2,3
May 1–May 15 4
May 16–June 30 4,5,6,7
July 1–July 15 5,6,7
July 16–August 31
September 1–September 30 8,9,10,11
October 1–December 31
Mulch
Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment
of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP
Fact Sheet for additional guidance.
Maintenance and Removal
Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed
and mulch these areas, as needed.
An area that has been permanently seeded should have a good stand of vegetation within one growing
season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of
the site that fail to germinate or remain bare after the first growing season.
Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may
also be necessary.
Protect seeded areas from construction equipment and vehicle access.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-1
Urban Storm Drainage Criteria Manual Volume 3
Description
Soil binders include a broad range of
treatments that can be applied to exposed
soils for temporary stabilization to reduce
wind and water erosion. Soil binders may
be applied alone or as tackifiers in
conjunction with mulching and seeding
applications.
Acknowledgement: This BMP Fact Sheet
has been adapted from the 2003
California Stormwater Quality
Association (CASQA) Stormwater BMP
Handbook: Construction
(www.cabmphandbooks.com).
Appropriate Uses
Soil binders can be used for short-term, temporary stabilization of soils on both mild and steep slopes.
Soil binders are often used in areas where work has temporarily stopped, but is expected to resume before
revegetation can become established. Binders are also useful on stockpiled soils or where temporary or
permanent seeding has occurred.
Prior to selecting a soil binder, check with the state and local jurisdiction to ensure that the chemicals
used in the soil binders are allowed. The water quality impacts of some types of soil binders are relatively
unknown and may not be allowed due to concerns about potential environmental impacts. Soil binders
must be environmentally benign (non-toxic to plant and animal life), easy to apply, easy to maintain,
economical, and should not stain paved or painted surfaces.
Soil binders should not be used in vehicle or pedestrian high traffic areas, due to loss in effectiveness
under these conditions.
Site soil type will dictate appropriate soil binders to be used. Be aware that soil binders may not function
effectively on silt or clay soils or highly compacted areas. Check manufacturer's recommendations for
appropriateness with regard to soil conditions. Some binders may not be suitable for areas with existing
vegetation.
Design and Installation
Properties of common soil binders used for erosion control
are provided in Table SB-1. Design and installation
guidance below are provided for general reference. Follow
the manufacturer's instructions for application rates and
procedures.
Soil Binders
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management Moderate
Photograph SB-1. Tackifier being applied to provide temporary soil
stabilization. Photo courtesy of Douglas County.
EC-3 Soil Binders (SB)
SB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table SB-1. Properties of Soil Binders for Erosion Control (Source: CASQA 2003)
Evaluation Criteria
Binder Type
Plant Material
Based
(short lived)
Plant Material
Based
(long lived)
Polymeric
Emulsion Blends
Cementitious-
Based Binders
Resistance to Leaching High High Low to Moderate Moderate
Resistance to Abrasion Moderate Low Moderate to High Moderate to High
Longevity Short to Medium Medium Medium to Long Medium
Minimum Curing Time
before Rain 9 to 18 hours 19 to 24 hours 0 to 24 hours 4 to 8 hours
Compatibility with
Existing Vegetation Good Poor Poor Poor
Mode of Degradation Biodegradable Biodegradable Photodegradable/
Chemically
Degradable
Photodegradable/
Chemically
Degradable
Specialized Application
Equipment
Water Truck or
Hydraulic
Mulcher
Water Truck or
Hydraulic
Mulcher
Water Truck or
Hydraulic Mulcher
Water Truck or
Hydraulic Mulcher
Liquid/Powder Powder Liquid Liquid/Powder Powder
Surface Crusting Yes, but
dissolves on
rewetting
Yes Yes, but dissolves on
rewetting Yes
Clean Up Water Water Water Water
Erosion Control
Application Rate Varies Varies Varies 4,000 to 12,000
lbs/acre Typ.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-3
Urban Storm Drainage Criteria Manual Volume 3
Factors to consider when selecting a soil binder generally include:
Suitability to situation: Consider where the soil binder will be applied, if it needs a high resistance
to leaching or abrasion, and whether it needs to be compatible with existing vegetation. Determine
the length of time soil stabilization will be needed, and if the soil binder will be placed in an area
where it will degrade rapidly. In general, slope steepness is not a discriminating factor.
Soil types and surface materials: Fines and moisture content are key properties of surface
materials. Consider a soil binder's ability to penetrate, likelihood of leaching, and ability to form a
surface crust on the surface materials.
Frequency of application: The frequency of application can be affected by subgrade conditions,
surface type, climate, and maintenance schedule. Frequent applications could lead to high costs.
Application frequency may be minimized if the soil binder has good penetration, low evaporation,
and good longevity. Consider also that frequent application will require frequent equipment clean up.
An overview of major categories of soil binders, corresponding to the types included in Table SB-1
follows.
Plant-Material Based (Short Lived) Binders
Guar: A non-toxic, biodegradable, natural galactomannan-based hydrocolloid treated with dispersant
agents for easy field mixing. It should be mixed with water at the rate of 11 to 15 lbs per 1,000
gallons. Recommended minimum application rates are provided in Table SB-2.
Table SB-2. Application Rates for Guar Soil Stabilizer
Slope (H:V)
Flat 4:1 3:1 2:1 1:1
Application Rate (lb/acre) 40 45 50 60 70
Psyllium: Composed of the finely ground muciloid coating of plantago seeds that is applied as a wet
slurry to the surface of the soil. It dries to form a firm but rewettable membrane that binds soil
particles together but permits germination and growth of seed. Psyllium requires 12 to 18 hours
drying time. Application rates should be from 80 to 200 lbs/acre, with enough water in solution to
allow for a uniform slurry flow.
Starch: Non-ionic, cold-water soluble (pre-gelatinized) granular cornstarch. The material is mixed
with water and applied at the rate of 150 lb/acre. Approximate drying time is 9 to 12 hours.
Plant-Material Based (Long Lived) Binders
Pitch and Rosin Emulsion: Generally, a non-ionic pitch and rosin emulsion has a minimum solids
content of 48 percent. The rosin should be a minimum of 26 percent of the total solids content. The
soil stabilizer should be a non-corrosive, water dilutable emulsion that upon application cures to a
water insoluble binding and cementing agent. For soil erosion control applications, the emulsion is
diluted and should be applied as follows:
o For clayey soil: 5 parts water to 1 part emulsion
EC-3 Soil Binders (SB)
SB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o For sandy soil: 10 parts water to 1 part emulsion
Application can be by water truck or hydraulic seeder with the emulsion and product mixture applied
at the rate specified by the manufacturer.
Polymeric Emulsion Blend Binders
Acrylic Copolymers and Polymers: Polymeric soil stabilizers should consist of a liquid or solid
polymer or copolymer with an acrylic base that contains a minimum of 55 percent solids. The
polymeric compound should be handled and mixed in a manner that will not cause foaming or should
contain an anti-foaming agent. The polymeric emulsion should not exceed its shelf life or expiration
date; manufacturers should provide the expiration date. Polymeric soil stabilizer should be readily
miscible in water, non-injurious to seed or animal life, non-flammable, should provide surface soil
stabilization for various soil types without inhibiting water infiltration, and should not re-emulsify
when cured. The applied compound should air cure within a maximum of 36 to 48 hours. Liquid
copolymer should be diluted at a rate of 10 parts water to 1 part polymer and the mixture applied to
soil at a rate of 1,175 gallons/acre.
Liquid Polymers of Methacrylates and Acrylates: This material consists of a tackifier/sealer that is
a liquid polymer of methacrylates and acrylates. It is an aqueous 100 percent acrylic emulsion blend
of 40 percent solids by volume that is free from styrene, acetate, vinyl, ethoxylated surfactants or
silicates. For soil stabilization applications, it is diluted with water in accordance with manufacturer's
recommendations, and applied with a hydraulic seeder at the rate of 20 gallons/acre. Drying time is
12 to 18 hours after application.
Copolymers of Sodium Acrylates and Acrylamides: These materials are non-toxic, dry powders
that are copolymers of sodium acrylate and acrylamide. They are mixed with water and applied to the
soil surface for erosion control at rates that are determined by slope gradient, as summarized in Table
SB-3.
Table SB-3. Application Rates for Copolymers of Sodium Acrylates and Acrylamides
Slope (H:V)
Flat to 5:1 5:1 to 3:1 2:2 to 1:1
Application Rate (lb/acre) 3.0-5.0 5.0-10.0 10.0-20.0
Polyacrylamide and Copolymer of Acrylamide: Linear copolymer polyacrylamide is packaged as
a dry flowable solid. When used as a stand-alone stabilizer, it is diluted at a rate of 11 lb/1,000 gal. of
water and applied at the rate of 5.0 lb/acre.
Hydrocolloid Polymers: Hydrocolloid Polymers are various combinations of dry flowable
polyacrylamides, copolymers, and hydrocolloid polymers that are mixed with water and applied to the
soil surface at rates of 55 to 60 lb/acre. Drying times are 0 to 4 hours.
Cementitious-Based Binders
Gypsum: This formulated gypsum based product readily mixes with water and mulch to form a thin
protective crust on the soil surface. It is composed of high purity gypsum that is ground, calcined and
processed into calcium sulfate hemihydrate with a minimum purity of 86 percent. It is mixed in a
hydraulic seeder and applied at rates 4,000 to 12,000 lb/acre. Drying time is 4 to 8 hours.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-5
Urban Storm Drainage Criteria Manual Volume 3
Installation
After selecting an appropriate soil binder, the untreated soil surface must be prepared before applying the
soil binder. The untreated soil surface must contain sufficient moisture to assist the agent in achieving
uniform distribution. In general, the following steps should be followed:
Follow manufacturer's written recommendations for application rates, pre-wetting of application area,
and cleaning of equipment after use.
Prior to application, roughen embankment and fill areas.
Consider the drying time for the selected soil binder and apply with sufficient time before anticipated
rainfall. Soil binders should not be applied during or immediately before rainfall.
Avoid over spray onto roads, sidewalks, drainage channels, sound walls, existing vegetation, etc.
Soil binders should not be applied to frozen soil, areas with standing water, under freezing or rainy
conditions, or when the temperature is below 40°F during the curing period.
More than one treatment is often necessary, although the second treatment may be diluted or have a
lower application rate.
Generally, soil binders require a minimum curing time of 24 hours before they are fully effective.
Refer to manufacturer's instructions for specific cure time.
For liquid agents:
o Crown or slope ground to avoid ponding.
o Uniformly pre-wet ground at 0.03 to 0.3 gal/yd2 or according to manufacturer's recommendations.
o Apply solution under pressure. Overlap solution 6 to 12 in.
o Allow treated area to cure for the time recommended by the manufacturer, typically at least 24
hours.
o Apply second treatment before first treatment becomes ineffective, using 50 percent application
rate.
o In low humidity, reactivate chemicals by re-wetting with water at 0.1 to 0.2 gal/yd2.
Maintenance and Removal
Soil binders tend to break down due to natural weathering. Weathering rates depend on a variety of site-
specific and product characteristics. Consult the manufacturer for recommended reapplication rates and
reapply the selected soil binder as needed to maintain effectiveness.
Soil binders can fail after heavy rainfall events and may require reapplication. In particular, soil binders
will generally experience spot failures during heavy rainfall events. If runoff penetrates the soil at the top
of a slope treated with a soil binder, it is likely that the runoff will undercut the stabilized soil layer and
discharge at a point further down slope.
EC-3 Soil Binders (SB)
SB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Areas where erosion is evident should be repaired and soil binder or other stabilization reapplied, as
needed. Care should be exercised to minimize the damage to protected areas while making repairs.
Most binders biodegrade after exposure to sun, oxidation, heat and biological organisms; therefore,
removal of the soil binder is not typically required.
Mulching (MU) EC-4
November 2010 Urban Drainage and Flood Control District MU-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph MU-1. An area that was recently seeded, mulched,
and crimped.
Description
Mulching consists of evenly applying
straw, hay, shredded wood mulch, bark or
compost to disturbed soils and securing
the mulch by crimping, tackifiers, netting
or other measures. Mulching helps reduce
erosion by protecting bare soil from
rainfall impact, increasing infiltration, and
reducing runoff. Although often applied
in conjunction with temporary or
permanent seeding, it can also be used for
temporary stabilization of areas that
cannot be reseeded due to seasonal
constraints.
Mulch can be applied either using
standard mechanical dry application
methods or using hydromulching equipment
that hydraulically applies a slurry of water,
wood fiber mulch, and often a tackifier.
Appropriate Uses
Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also
be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where
growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and
tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer
than 14 days) on portions of the site not otherwise permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed
in certain jurisdictions or may not be allowed near waterways.
Do not apply mulch during windy conditions.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track
walking. Track walking should only be used where other methods are impractical because track walking
with heavy equipment typically compacts the soil.
A variety of mulches can be used effectively at construction
sites, including the following types:
Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-4 Mulching (MU)
MU-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Clean, weed- and seed-free, long-stemmed grass hay (preferred) or cereal grain straw. Hay is preferred
because it is less susceptible to removal by wind. Mulch should be applied evenly at a rate of 2 tons per
acre and must be tacked or fastened by an approved method suitable for the type of mulch used. At least
50 percent of the grass hay mulch, by weight, should be 10 inches or more in length.
Grass hay mulch must be anchored and not merely placed on the surface. This can be accomplished
mechanically by crimping or with the aid of tackifiers or nets. Anchoring with a crimping implement is
preferred, and is the recommended method for areas flatter than 3:1. Mechanical crimpers must be
capable of tucking the long mulch fibers into the soil to a depth of 3 inches without cutting them. An
agricultural disk, while not an ideal substitute, may work if the disk blades are dull or blunted and set
vertically; however, the frame may have to be weighted to afford proper soil penetration.
On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory
for holding it in place. For steep slopes and special situations where greater control is needed, erosion
control blankets anchored with stakes should be used instead of mulch.
Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should
be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of
tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for
effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be
applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation
should be avoided.
Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and
steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass
or straw mulch. Normally, use of these products will be restricted to relatively small areas.
Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead
of mulch. (See the ECM/TRM BMP for more information.)
Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed
tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP
for more information on general types of tackifiers.)
Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and
allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for
temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full
coverage of exposed soil on the area it is applied.
Maintenance and Removal
After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as
needed, to cover bare areas.
Compost Blanket and Filter Berm (CB) EC-5
November 2010 Urban Drainage and Flood Control District CB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CB-1. Application of a compost
blanket to a disturbed area. Photo courtesy of
Caltrans.
Description
A compost blanket is a layer of compost uniformly applied
to the soil in disturbed areas to control erosion, facilitate
revegetation, and retain sediment resulting from sheet-flow
runoff.
A compost filter berm is a dike of compost or a compost
product that is placed perpendicular to runoff to control
erosion in disturbed areas and retain sediment. Compost
berms can be placed at regular intervals to help reduce the
formation of rill and gully erosion when a compost blanket
is stabilizing a slope.
Appropriate Uses
Compost blankets can be used as an alternative to erosion
control blankets and mulching to help stabilize disturbed
areas where sheet flow conditions are present. Compost
blankets should not be used in areas of concentrated flows.
Compost provides an excellent source of nutrients for plant
growth, and should be considered for use in areas that will be
permanently vegetated.
Design and Installation
See Detail CB-1 for design details and notes.
Do not place compost in areas where it can easily be transported into drainage pathways or waterways.
When using a compost blanket on a slope, berms should be installed periodically to reduce the potential
for concentrated flow and rilling. Seeding should be completed before an area is composted or
incorporated into the compost.
Compost quality is an important consideration when selecting compost blankets or berms. Representative
compost quality factors include pH, salinity, moisture content, organic matter content, stability (maturity),
and physical contaminants. The compost should meet all local, state, and federal quality requirements.
Biosolids compost must meet the Standards for Class A biosolids outlined in 40 CFR Part 503. The U.S.
Composting Council (USCC) certifies compost products under its Seal of Testing Assurance (STA)
Program. Compost producers whose products have been certified through the STA Program provide
customers with a standard product label that allows comparison between compost products. Only STA
certified, Class I compost should be used.
Compost Blankets and Berms
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-5 Compost Blanket and Filter Berm (CB)
CB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
When rills or gullies develop in an area that has been composted, fill and cover the area with additional
compost and install berms as necessary to help reduce erosion.
Weed control can be a maintenance challenge in areas using compost blankets. A weed control strategy
may be necessary, including measures such as mechanical removal and spot application of targeted
herbicides by licensed applicators.
For compost berms, accumulated sediments should be removed from behind the berm when the sediments
reach approximately one third the height of the berm. Areas that have been washed away should be
replaced. If the berm has experienced significant or repeated washouts, a compost berm may not be the
appropriate BMP for this area.
Compost blankets and berms biodegrade and do not typically require removal following site stabilization.
Compost Blanket and Filter Berm (CB) EC-5
November 2010 Urban Drainage and Flood Control District CB-3
Urban Storm Drainage Criteria Manual Volume 3
EC-5 Compost Blanket and Filter Berm (CB)
CB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RECP-1. Erosion control blanket protecting the slope from
erosion and providing favorable conditions for revegetation.
Description
Rolled Erosion Control Products
(RECPs) include a variety of
temporary or permanently installed
manufactured products designed to
control erosion and enhance vegetation
establishment and survivability,
particularly on slopes and in channels.
For applications where natural
vegetation alone will provide sufficient
permanent erosion protection,
temporary products such as netting,
open weave textiles and a variety of
erosion control blankets (ECBs) made
of biodegradable natural materials
(e.g., straw, coconut fiber) can be used.
For applications where natural
vegetation alone will not be sustainable under expected flow conditions, permanent rolled erosion control
products such as turf reinforcement mats (TRMs) can be used. In particular, turf reinforcement mats are
designed for discharges that exert velocities and sheer stresses that exceed the typical limits of mature
natural vegetation.
Appropriate Uses
RECPs can be used to control erosion in conjunction with revegetation efforts, providing seedbed
protection from wind and water erosion. These products are often used on disturbed areas on steep
slopes, in areas with highly erosive soils, or as part of drainageway stabilization. In order to select the
appropriate RECP for site conditions, it is important to have a general understanding of the general types
of these products, their expected longevity, and general characteristics.
The Erosion Control Technology Council (ECTC 2005) characterizes rolled erosion control products
according to these categories:
Mulch control netting: A planar woven natural fiber or extruded geosynthetic mesh used as a
temporary degradable rolled erosion control product to anchor loose fiber mulches.
Open weave textile: A temporary degradable rolled erosion control product composed of processed
natural or polymer yarns woven into a matrix, used to provide erosion control and facilitate
vegetation establishment.
Erosion control blanket (ECB): A temporary
degradable rolled erosion control product composed of
processed natural or polymer fibers which are
mechanically, structurally or chemically bound together
to form a continuous matrix to provide erosion control
and facilitate vegetation establishment. ECBs can be
further differentiated into rapidly degrading single-net
and double-net types or slowly degrading types.
Rolled Erosion Control Products
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-6 Rolled Erosion Control Products (RECP)
RECP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Turf Reinforcement Mat (TRM): A rolled erosion control product composed of non-degradable
synthetic fibers, filaments, nets, wire mesh, and/or other elements, processed into a permanent, three-
dimensional matrix of sufficient thickness. TRMs, which may be supplemented with degradable
components, are designed to impart immediate erosion protection, enhance vegetation establishment
and provide long-term functionality by permanently reinforcing vegetation during and after
maturation. Note: TRMs are typically used in hydraulic applications, such as high flow ditches and
channels, steep slopes, stream banks, and shorelines, where erosive forces may exceed the limits of
natural, unreinforced vegetation or in areas where limited vegetation establishment is anticipated.
Tables RECP-1 and RECP-2 provide guidelines for selecting rolled erosion control products appropriate
to site conditions and desired longevity. Table RECP-1 is for conditions where natural vegetation alone
will provide permanent erosion control, whereas Table RECP-2 is for conditions where vegetation alone
will not be adequately stable to provide long-term erosion protection due to flow or other conditions.
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-3
Urban Storm Drainage Criteria Manual Volume 3
Table RECP-1. ECTC Standard Specification for Temporary Rolled Erosion Control Products
(Adapted from Erosion Control Technology Council 2005)
Product Description Slope
Applications*
Channel
Applications*
Minimum
Tensile
Strength1
Expected
Longevity
Maximum
Gradient C Factor2,5 Max. Shear
Stress3,4,6
Mulch Control Nets 5:1 (H:V) ≤0.10 @
5:1
0.25 lbs/ft2
(12 Pa)
5 lbs/ft
(0.073 kN/m)
Up to 12
months
Netless Rolled
Erosion Control
Blankets
4:1 (H:V) ≤0.10 @
4:1
0.5 lbs/ft2
(24 Pa)
5 lbs/ft
(0.073 kN/m)
Single-net Erosion
Control Blankets &
Open Weave Textiles
3:1 (H:V) ≤0.15 @
3:1
1.5 lbs/ft2
(72 Pa)
50 lbs/ft
(0.73 kN/m)
Double-net Erosion
Control Blankets 2:1 (H:V) ≤0.20 @
2:1
1.75 lbs/ft2
(84 Pa)
75 lbs/ft
(1.09 kN/m)
Mulch Control Nets 5:1 (H:V) ≤0.10 @
5:1
0.25 lbs/ft2
(12 Pa)
25 lbs/ft
(0.36 kN/m) 24 months
Erosion Control
Blankets & Open
Weave Textiles
(slowly degrading)
1.5:1 (H:V) ≤0.25 @
1.5:1
2.00 lbs/ft2
(96 Pa)
100 lbs/ft
(1.45 kN/m) 24 months
Erosion Control
Blankets & Open
Weave Textiles
1:1 (H:V) ≤0.25 @
1:1
2.25 lbs/ft2
(108 Pa)
125 lbs/ft
(1.82 kN/m) 36 months
* C Factor and shear stress for mulch control nettings must be obtained with netting used in conjunction
with pre-applied mulch material. (See Section 5.3 of Chapter 7 Construction BMPs for more information
on the C Factor.)
1 Minimum Average Roll Values, Machine direction using ECTC Mod. ASTM D 5035.
2 C Factor calculated as ratio of soil loss from RECP protected slope (tested at specified or greater
gradient, H:V) to ratio of soil loss from unprotected (control) plot in large-scale testing.
3 Required minimum shear stress RECP (unvegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in) soil loss) during a 30-minute flow event in large-scale testing.
4 The permissible shear stress levels established for each performance category are based on historical
experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05.
5 Acceptable large-scale test methods may include ASTM D 6459, or other independent testing deemed
acceptable by the engineer.
6 Per the engineer’s discretion. Recommended acceptable large-scale testing protocol may include ASTM
D 6460, or other independent testing deemed acceptable by the engineer.
EC-6 Rolled Erosion Control Products (RECP)
RECP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table RECP-2. ECTC Standard Specification for Permanent1 Rolled Erosion Control Products
(Adapted from: Erosion Control Technology Council 2005)
Product Type Slope
Applications Channel Applications
TRMs with a minimum thickness of
0.25 inches (6.35 mm) per ASTM D
6525 and UV stability of 80% per
ASTM D 4355 (500 hours
exposure).
Maximum
Gradient
Maximum
Shear Stress4,5
Minimum
Tensile
Strength2,3
0.5:1 (H:V) 6.0 lbs/ft2 (288 Pa) 125 lbs/ft (1.82
kN/m)
0.5:1 (H:V) 8.0 lbs/ft2 (384 Pa) 150 lbs/ft (2.19
kN/m)
0.5:1 (H:V) 10.0 lbs/ft2 (480 Pa) 175 lbs/ft (2.55
kN/m)
1 For TRMs containing degradable components, all property values must be obtained on the non-
degradable portion of the matting alone.
2 Minimum Average Roll Values, machine direction only for tensile strength determination using ASTM
D 6818 (Supersedes Mod. ASTM D 5035 for RECPs)
3 Field conditions with high loading and/or high survivability requirements may warrant the use of a TRM
with a tensile strength of 44 kN/m (3,000 lb/ft) or greater.
4 Required minimum shear stress TRM (fully vegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in.) soil loss) during a 30-minute flow event in large scale testing.
5 Acceptable large-scale testing protocols may include ASTM D 6460, or other independent testing
deemed acceptable by the engineer.
Design and Installation
RECPs should be installed according to manufacturer’s specifications and guidelines. Regardless of the
type of product used, it is important to ensure no gaps or voids exist under the material and that all
corners of the material are secured using stakes and trenching. Continuous contact between the product
and the soil is necessary to avoid failure. Never use metal stakes to secure temporary erosion control
products. Often wooden stakes are used to anchor RECPs; however, wood stakes may present installation
and maintenance challenges and generally take a long time to biodegrade. Some local jurisdictions have
had favorable experiences using biodegradable stakes.
This BMP Fact Sheet provides design details for several commonly used ECB applications, including:
ECB-1 Pipe Outlet to Drainageway
ECB-2 Small Ditch or Drainageway
ECB-3 Outside of Drainageway
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-5
Urban Storm Drainage Criteria Manual Volume 3
Staking patterns are also provided in the design details according to these factors:
ECB type
Slope or channel type
For other types of RECPs including TRMs, these design details are intended to serve as general
guidelines for design and installation; however, engineers should adhere to manufacturer’s installation
recommendations.
Maintenance and Removal
Inspection of erosion control blankets and other RECPs includes:
Check for general signs of erosion, including voids beneath the mat. If voids are apparent, fill the
void with suitable soil and replace the erosion control blanket, following the appropriate staking
pattern.
Check for damaged or loose stakes and secure loose portions of the blanket.
Erosion control blankets and other RECPs that are biodegradable typically do not need to be removed
after construction. If they must be removed, then an alternate soil stabilization method should be installed
promptly following removal.
Turf reinforcement mats, although generally resistant to biodegradation, are typically left in place as a
dense vegetated cover grows in through the mat matrix. The turf reinforcement mat provides long-term
stability and helps the established vegetation resist erosive forces.
EC-6 Rolled Erosion Control Products (RECP)
RECP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-7
Urban Storm Drainage Criteria Manual Volume 3
EC-6 Rolled Erosion Control Products (RECP)
RECP-8 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-9
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP) EC-8
November 2010 Urban Drainage and Flood Control District TOP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TOP-1. Riprap outlet protection.
Description
Outlet protection helps to reduce erosion
immediately downstream of a pipe,
culvert, slope drain, rundown or other
conveyance with concentrated, high-
velocity flows. Typical outlet protection
consists of riprap or rock aprons at the
conveyance outlet.
Appropriate Uses
Outlet protection should be used when a
conveyance discharges onto a disturbed
area where there is potential for accelerated
erosion due to concentrated flow. Outlet
protection should be provided where the velocity at the culvert outlet exceeds the maximum permissible
velocity of the material in the receiving channel.
Note: This Fact Sheet and detail are for temporary outlet protection, outlets that are intended to be used
for less than 2 years. For permanent, long-term outlet protection, see the Major Drainage chapter of
Volume 1.
Design and Installation
Design outlet protection to handle runoff from the largest drainage area that may be contributing runoff
during construction (the drainage area may change as a result of grading). Key in rock, around the entire
perimeter of the apron, to a minimum depth of 6 inches for stability. Extend riprap to the height of the
culvert or the normal flow depth of the downstream channel, whichever is less. Additional erosion
control measures such as vegetative lining, turf reinforcement mat and/or other channel lining methods
may be required downstream of the outlet protection if the channel is susceptible to erosion. See Design
Detail OP-1 for additional information.
Maintenance and Removal
Inspect apron for damage and displaced rocks. If rocks are missing or significantly displaced, repair or
replace as necessary. If rocks are continuously missing or displaced, consider increasing the size of the
riprap or deeper keying of the perimeter.
Remove sediment accumulated at the outlet before the outlet protection becomes buried and ineffective.
When sediment accumulation is noted, check that upgradient BMPs, including inlet protection, are in
effective operating condition.
Outlet protection may be removed once the pipe is no longer
draining an upstream area, or once the downstream area has
been sufficiently stabilized. If the drainage pipe is
permanent, outlet protection can be left in place; however,
permanent outlet protection should be designed and
constructed in accordance with the requirements of the
Major Drainage chapter of Volume 2.
Outlet Protection
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-8 Temporary Outlet Protection (TOP)
TOP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP) EC-8
November 2010 Urban Drainage and Flood Control District TOP-3
Urban Storm Drainage Criteria Manual Volume 3
Wind Erosion/Dust Control (DC) EC-14
November 2010 Urban Drainage and Flood Control District DC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph DC-1. Water truck used for dust suppression. Photo
courtesy of Douglas County.
Description
Wind erosion and dust control BMPs
help to keep soil particles from entering
the air as a result of land disturbing
construction activities. These BMPs
include a variety of practices generally
focused on either graded disturbed areas
or construction roadways. For graded
areas, practices such as seeding and
mulching, use of soil binders, site
watering, or other practices that provide
prompt surface cover should be used.
For construction roadways, road
watering and stabilized surfaces should
be considered.
Appropriate Uses
Dust control measures should be used on any site where dust poses a problem to air quality. Dust control
is important to control for the health of construction workers and surrounding waterbodies.
Design and Installation
The following construction BMPs can be used for dust control:
An irrigation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil
particles from becoming airborne.
Seeding and mulching can be used to stabilize disturbed surfaces and reduce dust emissions.
Protecting existing vegetation can help to slow wind velocities across the ground surface, thereby
limiting the likelihood of soil particles to become airborne.
Spray-on soil binders form a bond between soil particles keeping them grounded. Chemical
treatments may require additional permitting requirements. Potential impacts to surrounding
waterways and habitat must be considered prior to use.
Placing rock on construction roadways and entrances will help keep dust to a minimum across the
construction site.
Wind fences can be installed on site to reduce wind
speeds. Install fences perpendicular to the prevailing
wind direction for maximum effectiveness.
Maintenance and Removal
When using an irrigation/sprinkler control system to aid in
dust control, be careful not to overwater. Overwatering will
cause construction vehicles to track mud off-site.
Wind Erosion Control/
Dust Control
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management Moderate
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CWA-1. Example of concrete washout area. Note gravel
tracking pad for access and sign.
Description
Concrete waste management involves
designating and properly managing a
specific area of the construction site as a
concrete washout area. A concrete
washout area can be created using one of
several approaches designed to receive
wash water from washing of tools and
concrete mixer chutes, liquid concrete
waste from dump trucks, mobile batch
mixers, or pump trucks. Three basic
approaches are available: excavation of a
pit in the ground, use of an above ground
storage area, or use of prefabricated haul-
away concrete washout containers.
Surface discharges of concrete washout
water from construction sites are prohibited.
Appropriate Uses
Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid
concrete waste from onsite concrete mixing or concrete delivery.
Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete
washout, the soil must have adequate buffering capacity to result in protection of state groundwater
standards; otherwise, a liner/containment must be used. The following management practices are
recommended to prevent an impact from unlined pits to groundwater:
The use of the washout site should be temporary (less than 1 year), and
The washout site should be not be located in an area where shallow groundwater may be present, such
as near natural drainages, springs, or wetlands.
Design and Installation
Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface
waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the
ground, commercially manufactured prefabricated washout containers, or aboveground holding areas
constructed of berms, sandbags or straw bales with a plastic liner.
Although unlined washout areas may be used, lined pits may be required to protect groundwater under
certain conditions.
Do not locate an unlined washout area within 400 feet
of any natural drainage pathway or waterbody or
within 1,000 feet of any wells or drinking water
sources. Even for lined concrete washouts, it is
advisable to locate the facility away from waterbodies
and drainage paths. If site constraints make these
Concrete Washout Area
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-1 Concrete Washout Area (CWA)
CWA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an
impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated
concrete washout devices or a lined aboveground storage area should be used.
Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage
areas. Pre-fabricated concrete washout container information can be obtained from vendors.
Maintenance and Removal
A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying
the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is being used, as opposed to
washout in non-designated areas of the site.
Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to
about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal
location.
Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any
contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash
water is allowed to evaporate and the concrete hardens, it may be recycled.
Photograph CWA-3. Earthen concrete washout. Photo
courtesy of CDOT.
Photograph CWA-2. Prefabricated concrete washout. Photo
courtesy of CDOT.
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-3
Urban Storm Drainage Criteria Manual Volume 3
MM-1 Concrete Washout Area (CWA)
CWA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SP-1. A topsoil stockpile that has been partially
revegetated and is protected by silt fence perimeter control.
Description
Stockpile management includes
measures to minimize erosion and
sediment transport from soil stockpiles.
Appropriate Uses
Stockpile management should be used
when soils or other erodible materials
are stored at the construction site.
Special attention should be given to
stockpiles in close proximity to natural
or manmade storm systems.
Design and Installation
Locate stockpiles away from all drainage system components including storm sewer inlets. Where
practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the
phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such
as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance
on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a
stabilized designated access point on the upgradient side of the stockpile.
Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control
blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should
be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14
days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited
time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are
"typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that
may be more prescriptive.
Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to
space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all
inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be
protected.
Maintenance and Removal
Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets.
Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be
necessary.
When temporary removal of a perimeter BMP is necessary
to access a stockpile, ensure BMPs are reinstalled in
accordance with their respective design detail section.
Stockpile Management
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management Yes
MM-2 Stockpile Management (SM)
SP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise
stabilize the ground surface where the stockpile was located.
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-3
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-5
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs GH-1 and GH-2. Proper materials
storage and secondary containment for fuel tanks
are important good housekeeping practices. Photos
courtesy of CDOT and City of Aurora.
Description
Implement construction site good housekeeping practices to
prevent pollution associated with solid, liquid and hazardous
construction-related materials and wastes. Stormwater
Management Plans (SWMPs) should clearly specify BMPs
including these good housekeeping practices:
Provide for waste management.
Establish proper building material staging areas.
Designate paint and concrete washout areas.
Establish proper equipment/vehicle fueling and
maintenance practices.
Control equipment/vehicle washing and allowable non-
stormwater discharges.
Develop a spill prevention and response plan.
Acknowledgement: This Fact Sheet is based directly on
EPA guidance provided in Developing Your Stormwater
Pollution Prevent Plan (EPA 2007).
Appropriate Uses
Good housekeeping practices are necessary at all construction sites.
Design and Installation
The following principles and actions should be addressed in SWMPs:
Provide for Waste Management. Implement management procedures and practices to prevent or
reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the site. Practices such as trash disposal, recycling, proper material handling,
and cleanup measures can reduce the potential for stormwater runoff to pick up construction site
wastes and discharge them to surface waters. Implement a comprehensive set of waste-management
practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides,
wood preservatives, acids, roofing tar, and other materials. Practices should include storage,
handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be
considered include:
Solid or Construction Waste
o Designate trash and bulk waste-collection areas on-
site.
Good Housekeeping
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-3 Good Housekeeping Practices (GH)
GH-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GH-3. Locate portable toilet facilities on level
surfaces away from waterways and storm drains. Photo
courtesy of WWE.
o Recycle materials whenever possible (e.g., paper, wood, concrete, oil).
o Segregate and provide proper disposal options for hazardous material wastes.
o Clean up litter and debris from the construction site daily.
o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-
collection areas (dumpsters, and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges.
o Empty waste containers before they are full and overflowing.
Sanitary and Septic Waste
o Provide convenient, well-maintained, and properly located toilet facilities on-site.
o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintain clean restroom facilities and empty portable toilets regularly.
o Where possible, provide secondary containment pans under portable toilets.
o Provide tie-downs or stake-downs for portable toilets.
o Educate employees, subcontractors, and suppliers on locations of facilities.
o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
o Inspect facilities for leaks. If found, repair or replace immediately.
o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are
not spilled on the ground.
Hazardous Materials and Wastes
o Develop and implement employee and
subcontractor education, as needed, on
hazardous and toxic waste handling,
storage, disposal, and cleanup.
o Designate hazardous waste-collection
areas on-site.
o Place all hazardous and toxic material
wastes in secondary containment.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-3
Urban Storm Drainage Criteria Manual Volume 3
o Hazardous waste containers should be inspected to ensure that all containers are labeled properly
and that no leaks are present.
Establish Proper Building Material Handling and Staging Areas. The SWMP should include
comprehensive handling and management procedures for building materials, especially those that are
hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building
materials that have the potential to contaminate stormwater should be stored indoors or under cover
whenever possible or in areas with secondary containment. Secondary containment measures prevent
a spill from spreading across the site and may include dikes, berms, curbing, or other containment
methods. Secondary containment techniques should also ensure the protection of groundwater.
Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and
other potential pollutants. Designated staging areas enable easier monitoring of the use of materials
and clean up of spills. Training employees and subcontractors is essential to the success of this
pollution prevention principle. Consider the following specific materials handling and staging
practices:
o Train employees and subcontractors in proper handling and storage practices.
o Clearly designate site areas for staging and storage with signs and on construction drawings.
Staging areas should be located in areas central to the construction site. Segment the staging area
into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits
should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle
tracking controls (See Vehicle Tracking Control Fact Sheet).
o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC)
requirements and plans and provide cover and impermeable perimeter control, as necessary, for
hazardous materials and contaminated soils that must be stored on site.
o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation
failure, or other signs of deterioration and tested for soundness.
o Reuse and recycle construction materials when possible.
Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout
facilities at their own plants or dispatch facilities when feasible; however, concrete washout
commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on-
site, designate specific washout areas and design facilities to handle anticipated washout water.
Washout areas should also be provided for paint and stucco operations. Because washout areas can
be a source of pollutants from leaks or spills, care must be taken with regard to their placement and
proper use. See the Concrete Washout Area Fact Sheet for detailed guidance.
Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint,
and stucco work are occurring on large portions of the site. Be sure to check for evidence that
contractors are using the washout areas and not dumping materials onto the ground or into drainage
facilities. If the washout areas are not being used regularly, consider posting additional signage,
relocating the facilities to more convenient locations, or providing training to workers and
contractors.
When concrete, paint, or stucco is part of the construction process, consider these practices which will
help prevent contamination of stormwater. Include the locations of these areas and the maintenance
and inspection procedures in the SWMP.
MM-3 Good Housekeeping Practices (GH)
GH-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained
areas, or streams. Only use designated washout areas.
o Establish washout areas and advertise their locations with signs. Ensure that signage remains in
good repair.
o Provide adequate containment for the amount of wash water that will be used.
o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be
removed.
o Dispose of materials properly. The preferred method is to allow the water to evaporate and to
recycle the hardened concrete. Full service companies may provide dewatering services and
should dispose of wastewater properly. Concrete wash water can be highly polluted. It should
not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system without first receiving written permission from the system operator.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly
designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should
have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and
maintenance activities in a covered area. Consider the following practices to help prevent the
discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the
locations of designated fueling and maintenance areas and inspection and maintenance procedures in
the SWMP.
o Train employees and subcontractors in proper fueling procedures (stay with vehicles during
fueling, proper use of pumps, emergency shutoff valves, etc.).
o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service
problems.
o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses
to prevent stormwater run-on and runoff.
o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids.
o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and
recycle fluids whenever possible.
Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement
practices to prevent contamination of surface and groundwater from equipment and vehicle wash
water. Representative practices include:
o Educate employees and subcontractors on proper washing procedures.
o Use off-site washing facilities, when available.
o Clearly mark the washing areas and inform workers that all washing must occur in this area.
o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain
separation from drainage paths and waterbodies.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-5
Urban Storm Drainage Criteria Manual Volume 3
o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can
remove most dirt adequately.
o Do not conduct other activities, such as vehicle repairs, in the wash area.
o Include the location of the washing facilities and the inspection and maintenance procedures in
the SWMP.
Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be
identified in the SWMP. Representative procedures include identifying ways to reduce the chance of
spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by
spills, and train personnel responsible for spill prevention and response. The plan should also specify
material handling procedures and storage requirements and ensure that clear and concise spill cleanup
procedures are provided and posted for areas in which spills may potentially occur. When developing
a spill prevention plan, include the following:
o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface
waterbodies on or near the site, and measures to stop spills from leaving the site.
o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data
Sheets (MSDSs) for chemical used on site with the SWMP.
o Establish an education program for employees and subcontractors on the potential hazards to
humans and the environment from spills and leaks.
o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or
municipal sewage treatment facilities to request assistance. Emergency procedures and contact
numbers should be provided in the SWMP and posted at storage locations.
o Describe the procedures, equipment and materials for immediate cleanup of spills and proper
disposal.
o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill
prevention plan and clean up materials as changes occur to the types of chemicals stored and used
at the facility.
MM-3 Good Housekeeping Practices (GH)
GH-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Spill Prevention, Control, and Countermeasure (SPCC) Plan
Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and
implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks.
The facility is subject to this rule if it is a non-transportation-related facility that:
Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity
greater than 42,000 gallons.
Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters
of the United States and adjoining shorelines.
Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan.
To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm.
Reporting Oil Spills
In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for
assistance, or for more details, visit their website: www.nrc.uscg.mil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designation of personnel
responsible for supervising and implementing good housekeeping programs, such as site cleanup and
disposal of trash and debris, hazardous material management and disposal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in good housekeeping efforts.
Staging and storage areas require permanent stabilization when the areas are no longer being used for
construction-related activities.
Construction-related materials, debris and waste must be removed from the construction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Details:
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracking Control
Design details are not necessary for other good housekeeping practices; however, be sure to designate
where specific practices will occur on the appropriate construction drawings.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-1. Silt fence creates a sediment barrier, forcing
sheet flow runoff to evaporate or infiltrate.
Description
A silt fence is a woven geotextile fabric
attached to wooden posts and trenched
into the ground. It is designed as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
A silt fence can be used where runoff is
conveyed from a disturbed area as sheet
flow. Silt fence is not designed to
receive concentrated flow or to be used
as a filter fabric. Typical uses include:
Down slope of a disturbed area to
accept sheet flow.
Along the perimeter of a receiving
water such as a stream, pond or
wetland.
At the perimeter of a construction site.
Design and Installation
Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum
recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter
control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive conditions parallel to the silt fence.
See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the
fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled
out by hand and there should be no gaps between the ground and the fabric.
Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and
other specifications in the design details. Improper installation
of silt fence is a common reason for silt fence failure; however,
when properly installed and used for the appropriate purposes, it
can be highly effective.
Silt Fence
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-1 Silt Fence (SF)
SF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-2. When silt fence is not installed along
the contour, a "J-hook" installation may be appropriate
to ensure that the BMP does not create concentrated
flow parallel to the silt fence. Photo courtesy of Tom
Gore.
Maintenance and Removal
Inspection of silt fence includes observing the
material for tears or holes and checking for slumping
fence and undercut areas bypassing flows. Repair of
silt fence typically involves replacing the damaged
section with a new section. Sediment accumulated
behind silt fence should be removed, as needed to
maintain BMP effectiveness, typically before it
reaches a depth of 6 inches.
Silt fence may be removed when the upstream area
has reached final stabilization.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-3
Urban Storm Drainage Criteria Manual Volume 3
SC-1 Silt Fence (SF)
SF-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a
perimeter control around a soil stockpile; and, 2) as a "J-hook"
perimeter control at the corner of a construction site.
Description
A sediment control log is a linear roll
made of natural materials such as
straw, coconut fiber, or other fibrous
material trenched into the ground and
held with a wooden stake. Sediment
control logs are also often referred to
as "straw wattles." They are used as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
Sediment control logs can be used in
the following applications to trap
sediment:
As perimeter control for stockpiles
and the site.
As part of inlet protection designs.
As check dams in small drainage
ditches. (Sediment control logs
are not intended for use in
channels with high flow
velocities.)
On disturbed slopes to shorten flow
lengths (as an erosion control).
As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland.
Sediment control logs work well in combination with other layers of erosion and sediment controls.
Design and Installation
Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum
allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to sediment control logs installed along the contour. When installed for other uses, such as
perimeter control, it should be installed in a way that will not
produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and
evaporate or infiltrate in multiple areas rather than concentrate
and cause erosive conditions parallel to the BMP.
Sediment Control Log
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management No
SC-2 Sediment Control Log (SCL)
SCL-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become
a barrier and should be installed is if they are impermeable.
Design details and notes for sediment control logs are provided in Detail SCL-1. Sediment logs must be
properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When
installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to
flow).
Improper installation can lead to poor performance. Be sure that sediment control logs are properly
trenched, anchored and tightly jointed.
Maintenance and Removal
Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the
depth is one-half the height of the sediment log and repair damage to the sediment log, typically by
replacing the damaged section.
Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath
the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may
occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as
permanent slope breaks). However, removal of sediment control logs after final stabilization is typically
recommended when used in perimeter control, inlet protection and check dam applications.
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-3
Urban Storm Drainage Criteria Manual Volume 3
SC-2 Sediment Control Log (SCL)
SCL-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-5
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph IP-1. Inlet protection for a curb opening inlet.
Description
Inlet protection consists of permeable
barriers installed around an inlet to
filter runoff and remove sediment prior
to entering a storm drain inlet. Inlet
protection can be constructed from rock
socks, sediment control logs, silt fence,
block and rock socks, or other materials
approved by the local jurisdiction.
Area inlets can also be protected by
over-excavating around the inlet to
form a sediment trap.
Appropriate Uses
Install protection at storm sewer inlets
that are operable during construction.
Consider the potential for tracked-out
sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets
must be protected. This may include inlets in the general proximity of the construction area, not limited
to downgradient inlets. Inlet protection is not
Design and Installation
a stand-alone BMP and should be used in conjunction with
other upgradient BMPs.
To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the
inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet
to function without completely blocking flows into the inlet in a manner that causes localized flooding.
When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump
or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other
site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter
along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a
curb and gutter setting, but are effective area inlet protection measures.
Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary
products are available for inlet protection that may be approved for use by local governments. If
proprietary products are used, design details and installation procedures from the manufacturer must be
followed. Regardless of the type of inlet protection selected, inlet protection is most effective when
combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier
before runoff enters the storm sewer or receiving water.
Design details with notes are provided for these forms of inlet
protection:
IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade
Inlets
IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade
Inlets
Inlet Protection
(various forms)
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-6 Inlet Protection (IP)
IP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
IP-3. Rock Sock Inlet Protection for Sump/Area Inlet
IP-4. Silt Fence Inlet Protection for Sump/Area Inlet
IP-5. Over-excavation Inlet Protection
IP-6. Straw Bale Inlet Protection for Sump/Area Inlet
CIP-1. Culvert Inlet Protection
Propriety inlet protection devices should be installed in accordance with manufacturer specifications.
More information is provided below on selecting inlet protection for sump and on-grade locations.
Inlets Located in a Sump
When applying inlet protection in sump conditions, it is important that the inlet continue to function
during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower
than the top of the curb opening to allow overflow into the inlet during larger storms without excessive
localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter
becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing
localized flooding, public safety issues, and downstream erosion and damage from bypassed flows.
Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and
rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and
stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary
products providing equivalent functions.
Inlets Located on a Slope
For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended
in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads,
also see the Check Dam Fact Sheet.
Maintenance and Removal
Inspect inlet protection frequently. Inspection and maintenance guidance includes:
Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents
of the BMP (e.g., gravel) washing into the inlet.
Check for improper installation resulting in untreated flows bypassing the BMP and directly entering
the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been
properly trenched around the inlet can result in flows under the silt fence and directly into the inlet.
Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following
larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also
crush or displace the BMP.
Monitor sediment accumulation upgradient of the inlet protection.
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-3
Urban Storm Drainage Criteria Manual Volume 3
Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain
BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet
protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches.
Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain
the functionality of the BMP.
Propriety inlet protection devices should be inspected and maintained in accordance with
manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed
in a timely manner to prevent devices from breaking and spilling sediment into the storm drain.
Inlet protection must be removed and properly disposed of when the drainage area for the inlet has
reached final stabilization.
SC-6 Inlet Protection (IP)
IP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-5
Urban Storm Drainage Criteria Manual Volume 3
SC-6 Inlet Protection (IP)
IP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-7
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SB-1. Sediment basin at the toe of a slope. Photo
courtesy of WWE.
Description
A sediment basin is a temporary pond
built on a construction site to capture
eroded or disturbed soil transported in
storm runoff prior to discharge from the
site. Sediment basins are designed to
capture site runoff and slowly release it to
allow time for settling of sediment prior
to discharge. Sediment basins are often
constructed in locations that will later be
modified to serve as post-construction
stormwater basins.
Appropriate Uses
Most large construction sites (typically
greater than 2 acres) will require one or
more sediment basins for effective
management of construction site runoff. On linear construction projects, sediment basins may be
impractical; instead, sediment traps or other combinations of BMPs may be more appropriate.
Sediment basins should not be used as stand-alone sediment controls. Erosion and other sediment
controls should also be implemented upstream.
When feasible, the sediment basin should be installed in the same location where a permanent post-
construction detention pond will be located.
Design and Installation
The design procedure for a sediment basin includes these steps:
Basin Storage Volume: Provide a storage volume of at least 3,600 cubic feet per acre of drainage
area. To the extent practical, undisturbed and/or off-site areas should be diverted around sediment
basins to prevent “clean” runoff from mixing with runoff from disturbed areas. For undisturbed areas
(both on-site and off-site) that cannot be diverted around the sediment basin, provide a minimum of
500 ft3/acre of storage for undeveloped (but stable) off-site areas in addition to the 3,600 ft3/acre for
disturbed areas. For stable, developed areas that cannot be diverted around the sediment basin,
storage volume requirements are summarized in Table SB-1.
Basin Geometry: Design basin with a minimum length-to-width ratio of 2:1 (L:W). If this cannot be
achieved because of site space constraints, baffling may
be required to extend the effective distance between the
inflow point(s) and the outlet to minimize short-circuiting.
Dam Embankment: It is recommended that
embankment slopes be 4:1 (H:V) or flatter and no steeper
than 3:1 (H:V) in any location.
Sediment Basins
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-7 Sediment Basin (SB)
SB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inflow Structure: For concentrated flow entering the basin, provide energy dissipation at the point
of inflow.
Table SB-1. Additional Volume Requirements for Undisturbed and Developed TributaryAreas
Draining through Sediment Basins
Imperviousness (%)
Additional Storage Volume (ft3)
Per Acre of Tributary Area
Undeveloped 500
10 800
20 1230
30 1600
40 2030
50 2470
60 2980
70 3560
80 4360
90 5300
100 6460
Outlet Works: The outlet pipe shall extend through the embankment at a minimum slope of 0.5
percent. Outlet works can be designed using one of the following approaches:
o Perforated Riser/Plate: Follow the design criteria for Full Spectrum Detention outlets in the
EDB BMP Fact Sheet provided in Chapter 4 of this manual for sizing of outlet perforations with
an emptying time of approximately 72 hours. In lieu of the well-screen trash rack, pack
uniformly sized 1½ - to 2-inch gravel in front of the plate. This gravel will need to be cleaned out
frequently during the construction period as sediment accumulates within it. The gravel pack will
need to be removed and disposed of following construction to reclaim the basin for use as a
permanent detention facility. If the basin will be used as a permanent extended detention basin
for the site, a well-screen trash rack will need to be installed once contributing drainage areas
have been stabilized and the gravel pack and accumulated sediment have been removed.
o Floating Skimmer: If a floating skimmer is used, install it using manufacturer’s
recommendations. Illustration SB-1 provides an illustration of a Faircloth Skimmer Floating
Outlet™, one of the more commonly used floating skimmer outlets. A skimmer should be
designed to release the design volume in no less than 48 hours. The use of a floating skimmer
outlet can increase the sediment capture efficiency of a basin significantly. A floating outlet
continually decants cleanest water off the surface of the pond and releases cleaner water than
would discharge from a perforated riser pipe or plate.
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-3
Urban Storm Drainage Criteria Manual Volume 3
Illustration SB-1. Outlet structure for a temporary sediment basin - Faircloth Skimmer Floating Outlet. Illustration courtesy
of J. W. Faircloth & Sons, Inc., FairclothSkimmer.com.
o Outlet Protection: Outlet protection should be provided where the velocity of flow will exceed
the maximum permissible velocity of the material of the waterway into which discharge occurs.
This may require the use of a riprap apron at the outlet location and/or other measures to keep the
waterway from eroding.
o Emergency Spillway: Provide a stabilized emergency overflow spillway for rainstorms that
exceed the capacity of the sediment basin volume and its outlet. Protect basin embankments from
erosion and overtopping. If the sediment basin will be converted to a permanent detention basin,
design and construct the emergency spillway(s) as required for the permanent facility. If the
sediment basin will not become a permanent detention basin, it may be possible to substitute a
heavy polyvinyl membrane or properly bedded rock cover to line the spillway and downstream
embankment, depending on the height, slope, and width of the embankments.
Maintenance and Removal
Maintenance activities include the following:
• Dredge sediment from the basin, as needed to maintain BMP effectiveness, typically when the design
storage volume is no more than one-third filled with sediment.
• Inspect the sediment basin embankments for stability and seepage.
• Inspect the inlet and outlet of the basin, repair damage, and remove debris. Remove, clean and
replace the gravel around the outlet on a regular basis to remove the accumulated sediment within it
and keep the outlet functioning.
• Be aware that removal of a sediment basin may require dewatering and associated permit
requirements.
• Do not remove a sediment basin until the upstream area has been stabilized with vegetation.
SC-7 Sediment Basin (SB)
SB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Final disposition of the sediment basin depends on whether the basin will be converted to a permanent
post-construction stormwater basin or whether the basin area will be returned to grade. For basins being
converted to permanent detention basins, remove accumulated sediment and reconfigure the basin and
outlet to meet the requirements of the final design for the detention facility. If the sediment basin is not to
be used as a permanent detention facility, fill the excavated area with soil and stabilize with vegetation.
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-5
Urban Storm Drainage Criteria Manual Volume 3
SC-7 Sediment Basin (SB)
SB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-7
Urban Storm Drainage Criteria Manual Volume 3
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CP-1. Construction phasing to avoid disturbing the
entire area at one time. Photo courtesy of WWE.
Description
Effective construction site management
to minimize erosion and sediment
transport includes attention to
construction phasing, scheduling, and
sequencing of land disturbing activities.
On most construction projects, erosion
and sediment controls will need to be
adjusted as the project progresses and
should be documented in the SWMP.
Construction phasing refers to
disturbing only part of a site at a time to
limit the potential for erosion from
dormant parts of a site. Grading
activities and construction are completed
and soils are effectively stabilized on one
part of a site before grading and
construction begins on another portion of the site.
Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of
land disturbing activities and the installation of erosion and sediment control practices.
Appropriate Uses
All construction projects can benefit from upfront planning to phase and sequence construction activities
to minimize the extent and duration of disturbance. Larger projects and linear construction projects may
benefit most from construction sequencing or phasing, but even small projects can benefit from
construction sequencing that minimizes the duration of disturbance.
Typically, erosion and sediment controls needed at a site will change as a site progresses through the
major phases of construction. Erosion and sediment control practices corresponding to each phase of
construction must be documented in the SWMP.
Design and Installation
BMPs appropriate to the major phases of development should be identified on construction drawings. In
some cases, it will be necessary to provide several drawings showing construction-phase BMPs placed
according to stages of development (e.g., clearing and grading, utility installation, active construction,
final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area
associated with phases of a construction project. Additionally, requirements for phased construction
drawings vary among local governments within the UDFCD boundary. Some local governments require
separate erosion and sediment control drawings for initial
BMPs, interim conditions (in active construction), and final
stabilization.
Construction Scheduling
Functions
Erosion Control Moderate
Sediment Control Moderate
Site/Material Management Yes
SM-1 Construction Phasing/Sequencing (CP)
CP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Typical construction phasing BMPs include:
Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a
100-acre subdivision might be constructed in five phases of 20 acres each.
If there is carryover of stockpiled material from one phase to the next, position carryover material in a
location easily accessible for the pending phase that will not require disturbance of stabilized areas to
access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful
planning for location of stockpiles is important.
Typical construction sequencing BMPs include:
Sequence construction activities to minimize duration of soil disturbance and exposure. For example,
when multiple utilities will occupy the same trench, schedule installation so that the trench does not
have to be closed and opened multiple times.
Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion
control blankets) as soon as feasible following grading.
Install initial erosion and sediment control practices before construction begins. Promptly install
additional BMPs for inlet protection, stabilization, etc., as construction activities are completed.
Table CP-1 provides typical sequencing of construction activities and associated BMPs.
Maintenance and Removal
When the construction schedule is altered, erosion and sediment control measures in the SWMP and
construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the
construction site. Be aware that changes in construction schedules can have significant implications for
site stabilization, particularly with regard to establishment of vegetative cover.
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-3
Urban Storm Drainage Criteria Manual Volume 3
Table CP -1. Typical Phased BMP Installation for Construction Projects
Project
Phase BMPs
Pre-
disturbance,
Site Access
Install sediment controls downgradient of access point (on paved streets this may consist
of inlet protection).
Establish vehicle tracking control at entrances to paved streets. Fence as needed.
Use construction fencing to define the boundaries of the project and limit access to areas of
the site that are not to be disturbed.
Note: it may be necessary to protect inlets in the general vicinity of the site, even if not
downgradient, if there is a possibility that sediment tracked from the site could contribute
to the inlets.
Site Clearing
and Grubbing
Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles,
etc).
Limit disturbance to those areas planned for disturbance and protect undisturbed areas
within the site (construction fence, flagging, etc).
Preserve vegetative buffer at site perimeter.
Create stabilized staging area.
Locate portable toilets on flat surfaces away from drainage paths. Stake in areas
susceptible to high winds.
Construct concrete washout area and provide signage.
Establish waste disposal areas.
Install sediment basins.
Create dirt perimeter berms and/or brush barriers during grubbing and clearing.
Separate and stockpile topsoil, leave roughened and/or cover.
Protect stockpiles with perimeter control BMPs. Stockpiles should be located away from
drainage paths and should be accessed from the upgradient side so that perimeter controls
can remain in place on the downgradient side. Use erosion control blankets, temporary
seeding, and/or mulch for stockpiles that will be inactive for an extended period.
Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary
revegetation for areas of the site that have been disturbed but that will be inactive for an
extended period.
Water to minimize dust but not to the point that watering creates runoff.
SM-1 Construction Phasing/Sequencing (CP)
CP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Project
Phase BMPs
Utility And
Infrastructure
Installation
In Addition to the Above BMPs:
Close trench as soon as possible (generally at the end of the day).
Use rough-cut street control or apply road base for streets that will not be promptly paved.
Provide inlet protection as streets are paved and inlets are constructed.
Protect and repair BMPs, as necessary.
Perform street sweeping as needed.
Building
Construction
In Addition to the Above BMPs:
Implement materials management and good housekeeping practices for home building
activities.
Use perimeter controls for temporary stockpiles from foundation excavations.
For lots adjacent to streets, lot-line perimeter controls may be necessary at the back of
curb.
Final Grading
In Addition to the Above BMPs:
Remove excess or waste materials.
Remove stored materials.
Final
Stabilization
In Addition to the Above BMPs:
Seed and mulch/tackify.
Seed and install blankets on steep slopes.
Remove all temporary BMPs when site has reached final stabilization.
Protection of Existing Vegetation (PV) SM-2
November 2010 Urban Drainage and Flood Control District PV-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PV-1. Protection of existing vegetation and a sensitive
area. Photo courtesy of CDOT.
Description
Protection of existing vegetation on a
construction site can be accomplished
through installation of a construction
fence around the area requiring protection.
In cases where upgradient areas are
disturbed, it may also be necessary to
install perimeter controls to minimize
sediment loading to sensitive areas such as
wetlands. Existing vegetation may be
designated for protection to maintain a
stable surface cover as part of construction
phasing, or vegetation may be protected in
areas designated to remain in natural
condition under post-development
conditions (e.g., wetlands, mature trees,
riparian areas, open space).
Appropriate Uses
Existing vegetation should be preserved for the maximum practical duration on a construction site
through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and
can reduce revegetation costs following construction.
Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from
the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas.
If trees are to be protected as part of post-development landscaping, care must be taken to avoid several
types of damage, some of which may not be apparent at the time of injury. Potential sources of injury
include soil compaction during grading or due to construction traffic, direct equipment-related injury such
as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to
minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be
developed during site design, implemented at the beginning of a construction project, as well as continued
during active construction.
Design and Installation
General
Once an area has been designated as a preservation area, there should be no construction activity allowed
within a set distance of the area. Clearly mark the area with construction fencing. Do not allow
stockpiles, equipment, trailers or parking within the
protected area. Guidelines to protect various types of
existing vegetation follow.
Protection of Existing Vegetation
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management Yes
SM-2 Protection of Existing Vegetation (PV)
PV-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Surface Cover During Phased Construction
Install construction fencing or other perimeter controls around areas to be protected from clearing and
grading as part of construction phasing.
Maintaining surface cover on steep slopes for the maximum practical duration during construction is
recommended.
Open Space Preservation
Where natural open space areas will be preserved as part of a development, it is important to install
construction fencing around these areas to protect them from compaction. This is particularly important
when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open
space areas should not be used for staging and equipment storage.
Wetlands and Riparian Areas
Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to
prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as
silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland.
Tree Protection 1
Before beginning construction operations, establish a tree protection zone around trees to be
preserved by installing construction fences. Allow enough space from the trunk to protect the root
zone from soil compaction and mechanical damage, and the branches from mechanical damage (see
Table PV-1). If low branches will be kept, place the fence outside of the drip line. Where this is not
possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be
aware that about 60 percent of the tree's root zone extends beyond the drip line.
Table PV-1
Guidelines for Determining the Tree Protection Zone
(Source: Matheny and Clark, 1998; as cited in GreenCO and WWE 2008)
Distance from Trunk (ft) per inch of DBH
Species Tolerance to Damage Young Mature Over mature
Good 0.5' 0.75' 1.0'
Moderate 0.75' 1.0' 1.25'
Poor 1.0' 1.25' 1.5'
Notes: DBH = diameter at breast height (4.5 ft above grade); Young = <20% of
life expectancy; Mature = 20%-80% of life expectancy; Over mature =>80% of
life expectancy
Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection
zone should be avoided where possible because seemingly minor grade changes can either smother
1 Tree Protection guidelines adapted from GreenCO and WWE (2008). Green Industry Best Management Practices (BMPs) for
the Conservation and Protection of Water Resources in Colorado: Moving Toward Sustainability, Third Release. See
www.greenco.org for more detailed guidance on tree preservation.
Protection of Existing Vegetation (PV) SM-2
November 2010 Urban Drainage and Flood Control District PV-3
Urban Storm Drainage Criteria Manual Volume 3
roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to
avoid grade changes in the tree protection zone.
Place and maintain a layer of mulch 4 to 6-inch thick from the tree trunk to the fencing, keeping a
6-inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil
compaction if construction traffic is unavoidable. When planting operations are completed, the mulch
may be reused throughout planting areas.
Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree
protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals
to be dumped, or construction activities to take place except fine grading, irrigation system
installation, and planting operations. These activities should be conducted in consultation with a
landscaping professional, following Green Industry BMPs.
Be aware that soil compaction can cause extreme damage to tree health that may appear gradually
over a period of years. Soil compaction is easier to prevent than repair.
Maintenance and Removal
Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area.
If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a
designated preservation area is damaged beyond repair, remove and replace with a 2-inch diameter tree of
the same or similar species.
Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of
Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require
notification of the USACE.
If damage to vegetation occurs in a protected area, reseed the area with the same or similar species,
following the recommendations in the USDCM Revegetation chapter.
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CF-1. A construction fence helps delineate areas where
existing vegetation is being protected. Photo courtesy of Douglas
County.
Description
A construction fence restricts site access
to designated entrances and exits,
delineates construction site boundaries,
and keeps construction out of sensitive
areas such as natural areas to be
preserved as open space, wetlands and
riparian areas.
Appropriate Uses
A construction fence can be used to
delineate the site perimeter and locations
within the site where access is restricted
to protect natural resources such as
wetlands, waterbodies, trees, and other
natural areas of the site that should not be
disturbed.
If natural resource protection is an objective, then the construction fencing should be used in combination
with other perimeter control BMPs such as silt fence, sediment control logs or similar measures.
Design and Installation
Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s
recommendations. See Detail CF-1 for typical installations.
Do not place construction fencing in areas within work limits of machinery.
Maintenance and Removal
Inspect fences for damage; repair or replace as necessary.
Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.
Fencing should be removed once construction is complete.
Construction Fence
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SM-3 Construction Fence (CF)
CF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-3
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-1. A vehicle tracking control pad constructed with
properly sized rock reduces off-site sediment tracking.
Description
Vehicle tracking controls provide
stabilized construction site access where
vehicles exit the site onto paved public
roads. An effective vehicle tracking
control helps remove sediment (mud or
dirt) from vehicles, reducing tracking onto
the paved surface.
Appropriate Uses
Implement a stabilized construction
entrance or vehicle tracking control where
frequent heavy vehicle traffic exits the
construction site onto a paved roadway. An
effective vehicle tracking control is
particularly important during the following conditions:
Wet weather periods when mud is easily tracked off site.
During dry weather periods where dust is a concern.
When poorly drained, clayey soils are present on site.
Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at
particularly muddy sites.
Design and Installation
Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control
towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction
vehicles to the designated exit through the vehicle tracking control. There are several different types of
stabilized construction entrances including:
VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the most common vehicle tracking control, and when properly maintained can be
effective at removing sediment from vehicle tires.
VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over
vegetated areas. Although this application does not typically remove sediment from vehicles, it helps
protect existing vegetation and provides a stabilized entrance.
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-4 Vehicle Tracking Control (VTC)
VTC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-2. A vehicle tracking control pad with wheel wash
facility. Photo courtesy of Tom Gore.
VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar
to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as
hand-held power washing equipment to more advance proprietary systems. When a wheel wash is
provided, it is important to direct wash water to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenance and Removal
Inspect the area for degradation and
replace aggregate or material used for a
stabilized entrance/exit as needed. If the
area becomes clogged and ponds water,
remove and dispose of excess sediment
or replace material with a fresh layer of
aggregate as necessary.
With aggregate vehicle tracking controls,
ensure rock and debris from this area do
not enter the public right-of-way.
Remove sediment that is tracked onto the
public right of way daily or more
frequently as needed. Excess sediment
in the roadway indicates that the
stabilized construction entrance needs
maintenance.
Ensure that drainage ditches at the
entrance/exit area remain clear.
A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to
discharge. Also inspect channels conveying the water from the wash area to the sediment trap and
stabilize areas that may be eroding.
When a construction entrance/exit is removed, excess sediment from the aggregate should be removed
and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface
following removal, typically by paving.
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stabilized Construction Roadway (SCR) SM-5
November 2010 Urban Drainage and Flood Control District SCR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SCR-1. Stabilized construction roadway.
Description
A stabilized construction roadway is a
temporary method to control sediment
runoff, vehicle tracking, and dust from
roads during construction activities.
Appropriate Uses
Use on high traffic construction roads to
minimize dust and erosion.
Stabilized construction roadways are
used instead of rough-cut street controls
on roadways with frequent construction
traffic.
Design and Installation
Stabilized construction roadways typically involve two key components: 1) stabilizing the road surface
with an aggregate base course of 3-inch-diameter granular material and 2) stabilizing roadside ditches, if
applicable. Early application of road base is generally suitable where a layer of coarse aggregate is
specified for final road construction.
Maintenance and Removal
Apply additional gravel as necessary to ensure roadway integrity.
Inspect drainage ditches along the roadway for erosion and stabilize, as needed, through the use of check
dams or rolled erosion control products.
Gravel may be removed once the road is ready to be paved. Prior to paving, the road should be inspected
for grade changes and damage. Regrade and repair as necessary.
Stabilized Construction Roadway
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management Yes
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SSA-1. Example of a staging area with a gravel surface to
prevent mud tracking and reduce runoff. Photo courtesy of Douglas
County.
Description
A stabilized staging area is a clearly
designated area where construction
equipment and vehicles, stockpiles, waste
bins, and other construction-related
materials are stored. The contractor
office trailer may also be located in this
area. Depending on the size of the
construction site, more than one staging
area may be necessary.
Appropriate Uses
Most construction sites will require a
staging area, which should be clearly
designated in SWMP drawings. The layout
of the staging area may vary depending on
the type of construction activity. Staging areas located in roadways due to space constraints require
special measures to avoid materials being washed into storm inlets.
Design and Installation
Stabilized staging areas should be completed prior to other construction activities beginning on the site.
Major components of a stabilized staging area include:
Appropriate space to contain storage and provide for loading/unloading operations, as well as parking
if necessary.
A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.
Perimeter controls such as silt fence, sediment control logs, or other measures.
Construction fencing to prevent unauthorized access to construction materials.
Provisions for Good Housekeeping practices related to materials storage and disposal, as described in
the Good Housekeeping BMP Fact Sheet.
A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet,
to accommodate traffic associated with material delivery and waste disposal vehicles.
Over -sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that
required for the project. This increases costs, as well as
requirements for long-term stabilization following the
construction period. When designing the stabilized staging area,
minimize the area of disturbance to the extent practical.
Stabilized Staging Area
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material
Yes
SM-6 Stabilized Staging Area (SSA)
SSA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when
materials staging in roadways is required.
Maintenance and Removal
Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing
perimeter controls, and following good housekeeping practices.
When construction is complete, debris, unused stockpiles and materials should be recycled or properly
disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an
appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface
cover planned for the development.
Minimizing Long-Term Stabilization Requirements
Utilize off-site parking and restrict vehicle access to the site.
Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed
otherwise.
Consider use of a bermed contained area for materials and equipment that do not require a
stabilized surface.
Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise
disturbed.
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-3
Urban Storm Drainage Criteria Manual Volume 3
SM-6 Stabilized Staging Area (SSA)
SSA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Street Sweeping and Vacuuming (SS) SM-7
November 2010 Urban Drainage and Flood Control District SS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SS-1. A street sweeper removes sediment and potential
pollutants along the curb line at a construction site. Photo courtesy of
Tom Gore.
Description
Street sweeping and vacuuming remove
sediment that has been tracked onto
roadways to reduce sediment transport
into storm drain systems or a surface
waterway.
Appropriate Uses
Use this practice at construction sites
where vehicles may track sediment
offsite onto paved roadways.
Design and Installation
Street sweeping or vacuuming should be
conducted when there is noticeable
sediment accumulation on roadways adjacent to the construction site. Typically, this will be concentrated
at the entrance/exit to the construction site. Well-maintained stabilized construction entrances, vehicle
tracking controls and tire wash facilities can help reduce the necessary frequency of street sweeping and
vacuuming.
On smaller construction sites, street sweeping can be conducted manually using a shovel and broom.
Never wash accumulated sediment on roadways into storm drains.
Maintenance and Removal
Inspect paved roads around the perimeter of the construction site on a daily basis and more
frequently, as needed. Remove accumulated sediment, as needed.
Following street sweeping, check inlet protection that may have been displaced during street
sweeping.
Inspect area to be swept for materials that may be hazardous prior to beginning sweeping operations.
Street Sweeping/ Vacuuming
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management Yes
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph DW-1. A relatively small dewatering operation using straw
bales and a dewatering bag.
Photograph DW-2. Dewatering bags used for a relatively large
dewatering operation.
Description
The BMPs selected for construction
dewatering vary depending on site-
specific features such as soils,
topography, anticipated discharge
quantities, and discharge location.
Dewatering typically involves pumping
water from an inundated area to a BMP,
and then downstream to a receiving
waterway, sediment basin, or well-
vegetated area. Dewatering typically
involves use of several BMPs in
sequence.
Appropriate Uses
Dewatering operations are used when an
area of the construction site needs to be
dewatered as the result of a large storm
event, groundwater, or existing ponding
conditions. This can occur during deep
excavation, utility trenching, and wetland
or pond excavation.
Design and Installation
Dewatering techniques will vary
depending on site conditions. However,
all dewatering discharges must be treated
to remove sediment before discharging
from the construction site. Discharging
water into a sediment trap or basin is an
acceptable treatment option. Water may
also be treated using a dewatering filter bag,
and a series of straw bales or sediment logs. If these previous options are not feasible due to space or the
ability to passively treat the discharge to remove sediment, then a settling tank or an active treatment
system may need to be utilized. Settling tanks are manufactured tanks with a series of baffles to promote
settling. Flocculants can also be added to the tank to induce more rapid settling. This is an approach
sometimes used on highly urbanized construction sites. Contact the state agency for special requirements
prior to using flocculents and land application techniques.
Some commonly used methods to handle the pumped
water without surface discharge include land application
to vegetated areas through a perforated discharge hose
(i.e., the "sprinkler method") or dispersal from a water
truck for dust control.
Dewatering Operations
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-9 Dewatering Operations (DW)
DW-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Dewatering discharges to non-paved areas must minimize the potential for scour at the discharge point
either using a velocity dissipation device or dewatering filter bag.
Design Details are provided for these types of dewatering situations:
DW-1. Dewatering for Pond Already Filled with Water
DW-2 Dewatering Sump for Submersed Pump
DW-3 Sump Discharge Settling Basin
DW-4 Dewatering Filter Bag
Maintenance and Removal
When a sediment basin or trap is used to enable settling of sediment from construction dewatering
discharges, inspect the basin for sediment accumulation. Remove sediment prior to the basin or trap
reaching half full. Inspect treatment facilities prior to any dewatering activity. If using a sediment
control practice such as a sediment trap or basin, complete all maintenance requirements as described in
the fact sheets prior to dewatering.
Properly dispose of used dewatering bags, as well as sediment removed from the dewatering BMPs.
Depending on the size of the dewatering operation, it may also be necessary to revegetate or otherwise
stabilize the area where the dewatering operation was occurring.
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-3
Urban Storm Drainage Criteria Manual Volume 3
SM-9 Dewatering Operations (DW)
DW-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-5
Urban Storm Drainage Criteria Manual Volume 3
Paving and Grinding Operations (PGO) SM-12
November 2010 Urban Drainage and Flood Control District PGO-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PGO-1. Paving operations on a Colorado highway. Photo
courtesy of CDOT.
Description
Manage runoff from paving and grinding
operations to reduce pollutants entering
storm drainage systems and natural
drainageways.
Appropriate Uses
Use runoff management practices during
all paving and grinding operations such
as surfacing, resurfacing, and saw
cutting.
Design and Installation
There are a variety of management
strategies that can be used to manage runoff from paving and grinding operations:
Establish inlet protection for all inlets that could potentially receive runoff.
Schedule paving operations when dry weather is forecasted.
Keep spill kits onsite for equipment spills and keep drip pans onsite for stored equipment.
Install perimeter controls when asphalt material is used on embankments or shoulders near
waterways, drainages, or inlets.
Do not wash any paved surface into receiving storm drain inlets or natural drainageways. Instead,
loose material should be swept or vacuumed following paving and grinding operations.
Store materials away from drainages or waterways.
Recycle asphalt and pavement material when feasible. Material that cannot be recycled must be
disposed of in accordance with applicable regulations.
See BMP Fact Sheets for Inlet Protection, Silt Fence and other perimeter controls selected for use during
paving and grinding operations.
Maintenance and Removal
Perform maintenance and removal of inlet protection and perimeter controls in accordance with their
respective fact sheets.
Promptly respond to spills in accordance with the spill
prevention and control plan.
Paving and Grinding Operations
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes