HomeMy WebLinkAbout20252324.tiff Stormwater Management Plan ( SWMP )
for construction activities at :
Pelican Lake Ranch Filing No . 2
Northeast Corner of Weld County Road 32 and Weld County Road 39
Weld County , Colorado
Prepared For :
REI Limited Liability Co
P . O . BOX 156
Red Feather Lakes , CO 80545
Prepared By :
Terra Forma Solutions , Inc .
Todd Johnson , P . E .
Todd@terraformas . com
303 . 257 . 7653
SWMP Preparation Date : January 2025
SWMP Revision Date : May 2025
Table of Contents
SECTION 1 : SITE EVALUATION , ASSESSMENT , AND PLANNING 5
1 . 1 Project / Site Information 5
1 . 2 Contact Information / Responsible Parties 6
1 . 3 Nature and Sequence of Construction Activity 7
1 . 4 Soils , Drainage Patterns , and Vegetation 8
1 . 5 Construction Site Estimates 10
1 . 6 Receiving Waters 11
1 . 8 Potential Sources of Pollution 14
1 . 9 Anticipated Allowable Sources of Non - stormwater Discharge 18
1 . 10 Demolition 19
SECTION 2 : EROSION & SEDIM ENT CONTROL MEASURES 20
2 . 1 Minimize Disturbed Area & Protect Natural Features and Soil 22
2 . 2 Control Stormwater Flowing onto and through the Project 24
2 . 3 Soil Stabilization and Slope Protection 27
2 . 4 Storm Drain Inlet Protection 33
2 . 6 Retention of Sediment On - Site 35
2 . 7 Construction Entrance / Exit Stabilization 38
2 . 8 Additional Control Measures ( CMs ) 40
SECTION 3 : CONSTRUCTION SITE PHASING & EC PLAN 42
3 . 1 Construction Site Phasing Summary 42
3 . 2 General Notes 45
SECTION 4 : WASTE MANAGEMENT PLAN 46
4 . 1 Covering Outdoor Storage and Handling Areas 47
4 . 2 Spill Prevention and Response Plan 49
4 . 3 Good Housekeeping 52
4 . 4 Vehicle Maintenance , Fueling and Storage 54
4 . 5 Street Sweeping and Cleaning 56
4 . 6 Storm Sewer Cleaning 57
SECTION 5 : STORMWATER INSPECTIONS 58
5 . 1 Inspections 58
5 . 2 Delegation of Authority 60
5 . 3 Inspection Sequence 61
5 . 4 Common Compliance Problems 63
SECTION 6 : RECORDKEEPING 64
6 . 1 Recordkeeping 64
SECTION 7 : FINAL STABILIZATION 65
7 . 1 Final Stabilization Requirement 65
7 . 2 Removal of Temporary CMs 65
7 . 3 Stormwater Permits Close - out 65
7 . 4 Final Stabilization Measures 66
7 . 6 Long Term Stormwater Management 67
SECTION 8 : STORMWATER VIOLATIONS 68
8 . 1 Stormwater Violations 68
8 . 2 Potential Stormwater Violations 68
SECTION 9 : SWMP CERTIFICATION 69
9 . 1 SWMP Certification Statement 69
2
SWMP APPENDICES 70
APPENDIX 1 : Project Vicinity Map 71
APPENDIX 2 : CDPHE Stormwater Construction Permit + Local Stormwater Permit 72
APPENDIX 3 : Pre - Disturbance Photos 73
APPENDIX 4 : Local Demolition Permit + State Asbestos Permit 74
APPENDIX 5 : Erosion & Sediment CMs / BMPs Details 75
APPENDIX 6 : Erosion Control Plan ( EC Plan ) - Site Map 76
APPENDIX 7 : Stormwater Inspection Form ( Template ) 77
APPENDIX 8 : Delegation of Authority Form 81
APPENDIX : 9 Completed Stormwater Inspection Logs 82
APPENDIX 10 : Subcontractor Certifications / Agreements 83
APPENDIX 11 : Agreement for off - site Control Measures 84
APPENDIX 12 : State Low Risk Discharge Guidance for Discharges of Potable Water 85
APPENDIX 13 : Erosion and Sediment Control Standard Notes 88
Basic Acronyms :
SWMP : Stormwater Management Plan = ESCP : Erosion and Sediment Control Plan = SWPPP :
Stormwater Pollution Prevention Plan
EC Plan : Erosion Control Plan ( Site Map )
CM : Control Measures = BMP : Best Management Practices
MS4 : Municipal Separate Storm Sewer System
Objectives :
The SWMP identifies potential pollutant sources that may contribute to stormwater pollution , and
identifies CMs to reduce or eliminate water quality impacts during construction activities . The goal
is to keep sediments on - site . The most efficient construction site control measures are those that
prevent erosion from occurring .
The SWMP must be completed and implemented prior to project breaking ground , and revised by
the contractor ' s Qualified Stormwater Manager as construction proceeds , to accurately reflect the
site conditions and practices until final stabilization is reached . The SWMP intends to meet the
minimum requirements to comply with the State of Colorado CDPS General Permit for Stormwater
Discharges Associated with Construction Activity , and local unincorporated Weld County
regulations .
Disclaimer : This document has been modified from EPA SWPPP Template ( September 17 , 2007 ) in an effort to cover permit requirements . It is
ultimately the Permittee ' s responsibility to complete , insert , update , modify , delete or add site specific information to ensure compliance with federal ,
state and local regulations . The information contained in this template is for general information purposes only . The information is provided by the
County and while the County endeavors to keep the information up to date and correct , the County makes no representations or warranties of any
kind , express or implied , about the completeness , accuracy , reliability , suitability or any other aspect of this template or the information contained
in the template for any purpose . The user is responsible for compliance with all applicable laws and regulations . Any reliance placed on such
information is therefore strictly at your own risk . In making this template available , no client , advisory , fiduciary or professional relationship is
implicated or established and neither the County nor any other person is , in connection with this template , engaged in rendering legal , advisory ,
consulting or other professional services or advice . The County reserves the right at any time and without notice to change , amend , or cease
publication of this template .
3
Stormwater is runoff water from rain or snowmelt that does not infiltrate into the ground , and
instead flows across the land discharging directly into the environment without treatment .
40 % evapotranspiration 38 % evapotranspiration
• 10 % ' 20 %
� �/ runoff o runoff
1 , Ask _ / -. 'V'
i h f st " 4 lrrI M 25 % shallow 21 % ; halInw
O
a- I infiltration infiltration il
, - - " _ 25 % deep 21 % deep
' Nov
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rnfltratron infiltration
r w
r'
,= Ii Natural Ground Cover 10 % - 20 % Impervious Surface
-
" N . 35 % evapotranspiration 30 % evapotranspiration
g•Ili . r1 00 = 0 0 = 1110
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streams and rims infiltration infiltration
15 % dt? ep 5 % deep
infiltration infiltration
Mtn P eIfm It M S4 Permit 35 % - 50 % Impervious Surface 75 % - 100 % Impervious Surface
Runoff from construction sites can contain pollutants when runoff moves over and across disturbed
areas discharging them into lakes , rivers , wetlands , and into MS4 systems .
Typical erosion rates f i r r
land rd activities :rit`sr ' ; •
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( SOU loss from various land areas , j _ , • -f # ri
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Figure 2 . Typical erosion rues from land - biased activities . , ;
Unmanaged construction soils erodes about 6 times more than farming activities
Typically , sediment from disturbed areas is the main pollutant source at construction sites .
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Sediments easily attach to other pollutants and acts as a carrier , as well as impacting clarity of water which is critical for
aquatic life and fish species spawning areas preservation .
4
SECTION 1 : SITE EVALUATION , ASSESSMENT , AND PLANNING
1 . 1 Project/Site Information
Instructions :
- Include basic site information identifying general project information , permit numbers .
- Include a project vicinity map in Appendix 1 .
- Attach the State of Colorado CDPS Stormwater Construction Permit Certification Page in Appendix 2 .
- Attach a copy of the City / County Stormwater Permit in Appendix 2 .
Project / Site Name : Pelican Lake Ranch Filing No . 2
Project Location : Northeast Corner of Weld County Road 32 and Weld County Road 39
City : Weld County State : CO ZIP Code : 80651
Subdivision : Pelican Lake Ranch
State of Colorado - CDPS Stormwater Discharge Permit associated with Construction Activities
Permit Number : COR - 04
Weld County Stormwater Quality ( SWQ ) Permit :
5
1 . 2 Contact Information/Responsible Parties
Instructions :
List the owner , operator , stormwater contact , and organization that prepared the SWMP . Complete by selecting
the blue text , double right click , then type in the applicable information .
Owner :
REI LIMITED LIABILITY CO
P . O . Box 156 , Red Feather Lakes , CO 80545
Site Superintendent :
Site Supervisor ( s ) Company or Organization Name :
Site Supervisor ( s ) Name :
Site Supervisor ( s ) Address :
Office # : Cell # : Email :
Qualified Stormwater Manager : Individual responsible for implementing , maintaining , and
revising the SWMP , knowledgeable in the principles and practices of ESC and pollution
prevention , with the skills to :
• Assess conditions at construction sites that could impact stormwater quality , and
• Assess the effectiveness of stormwater controls measures ( CMs ) .
ESC Qualified Stormwater Manager ( s ) Company or Organization Name :
ESC Qualified Stormwater Manager ( s ) Name :
ESC Qualified Stormwater Manager ( s ) Title :
ESC Qualified Stormwater Manager ( s ) Address :
Office # : Cell # : Email :
Qualified Stormwater Manager ' s area of control ( if more than 1 operator at site ) :
SWMP prepared by :
Terra Forma Solutions
Todd Johnson , P . E .
3465 South Gaylord Court , A304 , Englewood , CO 80113
Cell # : 303 - 257 - 7653 Email : Todd@terraformas . com
6
1 . 3 Nature and Sequence of Construction Activity
Instructions :
- Describe the scope of the construction activity at the project site .
- Identify the purpose of the construction activity , include estimated dates to begin and conclude .
- Describe the sequence for major construction activities at each phase of the construction project .
Project scope of work :
283 - Lot Single Family subdivision with associated local roads , County Road turn lane
improvements , utilities , and drainage facilities .
Type of construction activity :
X Residential I 1Commercial Industrial Road Construction Linear Utility
Other ( please specify ) :
Estimated Project Start Date : TBD
Estimated Project Completion Date : TBD
Estimated Project Final Stabilization : TBD
Major phases of construction :
X Initial Control Measures ( CM )
Demolition
X Grading
X Utility Installation
Interim CM
X Road Construction
Vertical Construction
Final Grade
X Final Stabilization CM
Other ( please specify such as Over - Excavation , etc . ) :
Earth Work Summary :
Cut : ± 1 , 150 , 000 CY
Fill : ± 1 , 150 , 000 CY
If excess dirt : Site earthwork is planned to balance .
If importing dirt : Site earthwork is planned to balance .
Is the off - site borrow / fill area within % mile of the project ? N / A
If yes : either incorporate off - site area to the project ' s SWMP / EC plan , or submit a separate
SWMP / EC Plan for the off - site area .
7
1 . 4 Soils , Drainage Patterns , and Vegetation
Instructions :
- Describe the existing soil conditions at the construction site including soil type ( s ) , drainage patterns , and other
topographic features that might affect erosion and sediment control .
- Describe the pre - disturbance vegetation and include color pre - disturbance photos in Appendix 3 .
Soil type :
Primarily Valent Sand and Vona Loamy Sand
Source if this data :
USDA NRCS Web Soil Survey
Soil ' s erosion potential :
Moderate
Top Soil :
Describe quality of site ' s existing topsoil ?
Good
Depth of top soil that will be preserved ?
6 - 8 inches of vegetation and topsoil
Where will the top - soil be stored during construction ?
In multiple stockpiles throughout the project site .
Where will the top soil be ultimately re - utilized ?
In open spaces and the final grading of the residential lots , outside of building and pavement
areas .
Drainage pattern - Describe existing drainage patterns , slopes and changes due to the
proposed grading :
The site can be characterized as relatively flat to gently rolling . There is approximately 100 to
150 feet of vertical elevation drop across the site . Numerous gas / oil wells are located
throughout the site . The remainder of the site is currently being used as grazing land or dry
farmland . The exiting runoff generally drains to the southeast and into the Milton Reservoir .
There are several low areas on the development that don ' t have an outfall , however , the soils
in these areas are sandy and any runoff to these low areas currently infiltrates into the ground .
Existing drainage patterns will be maintained as much as possible , with developed runoff being
directed toward ten separate proposed retention ponds to infiltrate into the sandy soils , as is
occurring in the existing condition .
Vegetation :
Describe type of pre - disturbance vegetation :
The existing site is sparsely to moderately vegetated in grasses and sage brush .
8
Estimate the percentage of pre - existing vegetation cover of the entire site ( % ) :
80 %
Describe method for determining the percentage :
Aerial image observation .
9
1 . 5 Construction Site Estimates
Instructions :
- Estimate total project area .
- Estimate the area to be disturbed by excavation , grading , or other construction activities , including off - site
improvements , pavement cuts , dedicated off- site borrow or fill areas within 1/4 mile from the site , equipment and
material storage areas , and staging areas .
Total site area : ± 863 acres
Construction area to be disturbed : ± 836 acres
Are there any control measures ( CMs ) located outside the permitted area ( or limits of
construction ) , that are utilized for compliance , but not under the direct control of the
Permittee ? : No
If Yes : attach " Use Agreement " signed by the off - site owner / operator under Appendix 11 and
describe CMs location , specifications , etc .
10
1 . 6 Receiving Waters
Instructions :
- List the jurisdictional storm sewer system or drainage system that stormwater from your site discharges to ,
such as storm system within unincorporated Weld County MS4 , CDOT MS4 , City of Thornton MS4 , etc .
- Indicate inside which watershed the project is located .
- List the waterbody ( s ) that would receive stormwater from your site , including streams , rivers , lakes and
wetlands . Describe each as clearly as possible , such as : Clear Creek, a tributary to the South Platte River.
Including water courses even if they are usually dry , such as borrow ditches , arroyos , and other unnamed
waterways .
- Indicate if the stream segment of the waterbody ( s ) is impaired and if a Total Maximum Daily Load ( TMDL ) has
been adopted for any pollutant .
Location of the site ' s storm discharge : The exiting runoff generally drains to the southeast
and into the Milton Reservoir . There are several low areas on the development that don ' t
have an outfall , however , the soils in these areas are sandy and any runoff to these low areas
currently infiltrates into the ground .
If the site discharges to a public Municipal Separate Storm Sewer System ( MS4 ) , insert the
name of the MS4 owner : According to Weld County ' s online GIS database , no portion of this
project area is located within any Weld County MS4 areas and therefore this project is not
subject to the requirements of the County ' s MS4 program .
Name and description of the project ' s watershed : South Platte Watershed
Name and description of ultimately receiving water ( s ) , including stream segment
designation : Ground infiltration and the Milton Reservoir
• Distance from the project to the closest receiving water : 2 , 250 feet
• Is the receiving water stream segment impaired ? X Yes / 1 I No
• If yes , list TMDL ' s adopted for each pollutant : Dissolved Oxygen ( 5 . 0 mg / L ) and pH
( 0 . 100 mg / L Maximum and 0 . 04 - 0 . 06 mg / I average )
• Are these pollutants expected to be present at the construction site ? X Yes / 1 I No
• Which pollutant ? : Phosphorus
• Describe specific control measures ( CMs ) selected for the pollutant - specific
Wasteload Allocation ( WLA ) : No pollutants are expected to enter the Milton Reservoir
as a result of this project as all developed runoff on - site will be directed to on - site
retention ponds and will infiltrate into the ground , following existing drainage
patterns .
Are stream crossings within the construction site boundary ? 1 1 Yes / X No
• Location within the site : N / A
• Stream name : N / A
11
• Description of any disturbed upland areas that may contribute to the stream at the
stream crossing locations : N / A
• Description of the CMs to be implemented for those contributing disturbed upland
areas : N / A
Other :
12
1 . 7 Protected Site Features and Sensitive Areas
Instructions :
- Describe unique site features or sensitive area including historic structures , floodplain / floodway of streams ,
stream buffers , wetlands , specimen trees , natural vegetation , steep slopes , or highly erodible soils that are to
be preserved . Describe the measures that will be used to protect these features . Include unique features and
sensitive areas on the EC Plan drawings .
- Describe any known soil or groundwater contamination . Note that additional permitting is required from the
State of Colorado , Water Quality Control Division .
Refer to http : //www . cdphe . state . co . us / hm / HMSiteCover . htm and access the Hazardous Materials and Waste
Management Division Site Locator Mapping Application .
Describe unique site feature or sensitive area to be preserved during construction :
There are multiple existing gas wells and facilities throughout the site , most of which have
been abandoned and are not operational .
Describe measures to preserve unique site feature or sensitive area during construction :
Cut over existing gas wells will be avoided .
Describe any known soil or groundwater contamination :
Non Known .
Describe management plan for contaminated soils and / or groundwater :
N / A
Attach applicable Permits ( check if applicable ) :
404 Permit
401 Permit
Dewatering Permit ( off - site )
Remediation Permit
Other
13
1 . 8 Potential Sources of Pollution
Instructions :
- List and describe measures to control potential sources of pollution , which may reasonably be expected to
affect stormwater quality discharges from the construction site .
Below is a comprehensive list . Add rows if additional potential sources of pollution are identified .
- If a potential pollutant source is applicable to the site , then select the blue Yes / No , then type " Yes " or " No " .
Potential Potential
Pollution on this Control Measures ( CM ) CM Implementation ( as needed )
Source site ?
1 . Delineate protected areas prior to
ESC CMs ( IP , SF , SSA , TRM , construction .
RECP , TOP , SCL , SBB , RS , SB , ST ) 2 . Install CMs prior construction .
Disturbed & Preservation of existing 3 . Manage materials effectively once
Stored Soils vegetation ( PV , VB , CF , CP ) they arrive on site .
- grading Yes Materials management 4 . Place trash receptacles prior to
- spoils Solid waste management ( SP , construction .
- stockpiles GH ) 5 . Implement spill response .
Stockpile management ( SP ) 6 . Implement stockpile mgnt controls .
Vehicle tracking control ( VTC ) 7 . Delineate vehicle travel areas prior
to construction , adjust as needed .
1 . Install CMs prior construction .
ESC CMs ( IP , SF , SSA , TRM , 2 . Delineate vehicle travel areas prior
Vehicle RECP , TOP , SCL , SBB , RS , SB , ST ) to construction , adjust as needed .
Tracking Yes Vehicle traffic controls 3 . Install VTC prior to construction .
- all permitted Vehicle tracking controls ( VTC ) 4 . Implement SS as needed , in
vehicle traffic
Street sweeping ( SS ) conjunction with start of
construction .
Hazardous materials 1 . Implement hazardous materials
Contaminated management ( GH , CT ) management .
Soils
Yes Spill response & notification 2 . Implement spill response
( GH ) procedures .
Stockpile management ( SP ) 3 . Implement stockpile mgnt controls .
Loading & 1 . Manage materials effectively once
Unloading Yes Material management ( GH ) they arrive on site .
- construction Vehicle traffic controls ( VTC ) 2 . Delineate vehicle travel areas prior
materials to construction , adjust as needed .
Vehicle / equip
ment maint . & Spill prevention controls ( GH ) 1 . Designate fuel storage area .
fueling Designated fuel storage area 2 . Implement spill prevention
- gas , oil , Yes ( GH ) controls .
- diesel Spill response & notification 3 . Implement spill response and
- lubricants ( GH ) notification procedures .
-
hydraulicfluids
* Refer to Section 2 , for acronyms used to identify CM details .
14
Potential Potential
Pollution on this Control Measures ( CM ) CM Implementation
Source site ?
1 . Designate material storage areas
Outdoor prior to delivery .
storage 2 . Materials left outdoors must be
- building Material storage procedures
Yes covered if they can pollute
materials ( GH )
- fertilizers stormwater .
- chemicals 3 . Secondary containment must be
used for hazardous materials .
1 . Delineate protected areas prior to
construction .
Dust control DC 2 . Implement dust control in
( ) conjunction with soil disturbing
Temporary soi I stabilization ( SF ,
Dust SD GB SSA TRM RECP TOP activities .
- wind transport Yes ) 3 . I m I ement temporary soil
p Street sweeping ( SS ) p
- saw cutting stabilization measures as soon as
Preservation of existing
ve etation PV VB CF practical .
g ( ) 4 . Im lement street sweeping at the
p p g
start of major construction and
maintain as needed .
Routine 1 . Designate materials storage areas
Maintenance Material storage ( GH ) prior to site arrival .
Activities Hazardous waste management 2 . Practice hazardous waste
- fertilizers Yes ( GH , Chemical Treatment ) management procedures during
- pesticides ESC CMs ( IP , SF , SSA , RECP , the storage of such materials .
- detergents
- solvents TOP , SCL , SBB , RS , SB , ST ) 3 . Install ESC measures prior to
- fuels , oils , etc . landscape work .
Non - industrial 1 . Place temporary sanitary facilities
Waste Sanitary waste ( GH )
Yes on site and prevent off - site discharges .
- worker trash Solid waste management ( GH )
- portable toilets 2 . Place trash receptacles on site .
1 . Place trash receptacles on site .
On - site Waste management ( GH ) 2 . Place designated watertight
Industrial Liquid waste management ( GH ) receptacles or washout area ( s ) prior
Waste Yes
Hazardous waste management to activities that produce liquid waste .
- construction
debris , etc ( GH , CT ) 3 . Implement hazardous waste
management procedures .
Concrete
Truck Yes Concrete washout area CWA Install designated concrete washout ( s )
Chute ( )Tool
/ prior to concrete work .
Washing
Dr wall Mud Place designated watertight
y Yes Liquid waste management ( GH ) receptacles or washout area ( s ) prior
and Paint
to activities that produce liquid waste .
1 . Install designated CWA prior to
Fly Ash Concrete washout area ( CWA )
concrete activities .
- concrete Yes Hazardous waste management 2 . Im lement hazardous waste
- flow fill ( GH )
p
management procedures .
* Refer to Section 2 , for acronyms used to identify CM details .
15
Potential Potential
Pollution on this Control Measures ( CM ) CM Implementation
Source site ?
1 . Install secondary containment CMs
Dedicated : prior to using dedicated batch
- Asphalt Plants Secondary containment plants .
- Concrete Batch Yes Concrete washout area ( CWA ) 2 . Establish dedicated washout area
Plants Solid waste management ( GH ) before construction begins .
- Mortar / Masonry materials management ( GH ) 3 . Place trash receptacles on site .
Mixing Stations 4 . Manage materials effectively once
they arrive on site .
Waste from : 1 . Implement dust control in
- Geo - tech Test Dust control DC conjunction with soil disturbing
( ) activities .
Potholing Yes Material storage ( GH )
- saw Cutting 2 . Designate materials storage areas
- Utility borings Solid waste management ( GH )
prior to their arrival on site .
for locates 3 . Place trash receptacles on site .
Demolition of 1 . Implement dust control in
infrastructure : Dust control ( DC ) conjunction with soil disturbing
- concrete curb Yes
- asphalt road Solid waste management ( GH ) activities .
- steel / rebar 2 . Place trash receptacles .
Secondary containment 1 . Install secondarycontainment CMs
Electric Spill response & notification
Generator Yes ( GH ) prior to using generators .
2 . Implement hazardous waste
- pump Hazardous waste management
management procedures .
( GH CT )
Areas where
Hazardous waste management 1 . Implement hazardous waste
potential spills Yes ( GH ) management .
p Spill response & notification 2 . Implement spill response and
can occur
( GH ) notification procedures .
ESC CMs 1 . Install ESC measures prior to
Flushing discharge .
Waterlines Yes Low Risk Guidance for Potable 2 . Follow CMs required b the Low
Water * * See Appendix 12 * * q y
Risk Guidance See Appendix 12
* Refer to Section 2 , for acronyms used to identify CM details .
16
Potential hazardous material & chemical pollutants to stormwater:
Potentially Material / Physical
on Site ? Chemical Description
stormwater Pollutants location
Yes Fertilizer Liquid or solid Nitrogen , phosphorous Newlyseeded areas
grains g ' p p
Perchloroethylene ,
Colorless , blue , or methylene chloride
Yes Cleaning solvents yellow - green y Staging areas
liquid
trichloroethylene ,
petroleum distillates
Yes Asphalt Black solid Oil , petroleum Streets
p distillates
Curb and gutter ,
Yes Concrete and White solid / grey Limestone , sand , pH , sidewalk building
Grout liquid chromium
construction
Curb and gutter ,
Yes Curingcompounds Creamy white
liquid pys Na htha sidewalk driveways ,
concrete slabs
H Brown , oily
Hydraulic oil
y / Leaks or broken hoses
petroleum etroleum Mineral oil
fluids from equipment
hydrocarbon
Colorless , pale Benzene , ethyl Secondary
brown or pinky y
Yes Gasoline benzene , toluene , containment / staging
petroleum
h drocarbon xylene , MTBE area
Y
Ethylene glycol ,
Clear Leaks or broken hoses
Antifreeze / propylene glycol , heavy
Yes from equipment or
pp
coolant green / yellow metals ( copper , lead ,
liquid vehicles
q zinc )
Various colored Bacteria , parasites , and
Yes Sanitary toilets Staging areas
liquid viruses
17
1 . 9 Anticipated Allowable Sources of Non - stormwater Discharge
Instructions :
- Check box for presence of any anticipated allowable sources of non - stormwater discharge at the site such as :
uncontaminated springs , landscape irrigation return flows , construction dewatering , concrete washout , super -
chlorinated water for pipeline testing , etc .
- Include location ( if applicable ) .
Description and location of any anticipated allowable sources of non - stormwater discharge at
the site . Check if applicable :
1 1 Natural springs , only if :
• Uncontaminated , and
• Spring flows are not exposed to land disturbance
Location : N / A
X Landscape irrigation return flow
Location : Landscaped areas .
1 Construction dewatering , only if :
• Groundwater or groundwater combined with stormwater is uncontaminated , and
• Dewatering CMs are identified in the SWMP ( filtration measures at pump intake and outlet ) , and
• The discharge does not leave the site as surface runoff or to surface waters .
Note : For off - site discharges a separate State of Colorado Dewatering Permit is required .
Location : N / A
X Concrete washout ( CWA ) , only if :
• Liquids from washing concrete tools and concrete mixer chutes are properly contained , and
• No concrete washout water leaves the site as surface runoff or reach receiving waters
Liner under CWA is required if :
• The groundwater table level is high .
• CWA is within 400 feet of any natural drainage pathway or waterbody , or
• CWA is within 1 , 000 feet of any wells or drinking water sources .
1 I Check if the CWA liner is needed for this site .
Location : Near construction entrance ( s )
X Super - chlorinated water for line testing ( * * Refer to Appendix 12 for State Low Risk
Guidance ) .
• Discharge only after dechlorination CMs , such as industry standard dechlorination techniques or chemical
treatment to " no measurable chlorine " content , and
• Control flow during discharge to allow infiltration and reduce erosion of land
Location : Fire hydrants throughout the site .
Description and location of any other anticipated allowable sources of non - stormwater
discharge at the site : N / A
18
1 . 10 Demolition
Instructions :
- Before demolition of a structure begins , a copy of the Asbestos Certification from the State of Colorado
certifying the structure is free of asbestos and other pollutants must be obtained . Attach a copy of the
Demolition Permit , including the State of Colorado Asbestos Abatement Permit in Appendix 4 .
Are there any building structures to be demolished at this site ?
Yes X No
If yes :
1 ) Place a copy of Demolition Permit in Appendix 4 .
2 ) Place a copy of the State of Colorado Asbestos Certification in Appendix 4 .
3 ) Initial CMs must be installed prior beginning demolition work .
4 ) Describe additional steps taken to address demolition : N / A
19
SECTION 2 : ROS ON & SED NT CONTROL MEASUR S
Instructions :
Multiple permanent ( structural ) and temporary ( non - structural ) Control Measures ( CM ) are used for each phase of
construction to minimize stormwater pollution . Select and categorize each CM according to their purpose :
1 . Minimize disturbed area , and protect natural features and soil
2 . Control stormwater flowing onto and through the project
3 . Soil stabilization and slope protection
4 . Storm drain inlet protection
5 . Perimeter control and sediment barriers
6 . Retention of sediment on - site
7 . Construction entrance / exit stabilization
8 . Additional CMs
Describe the CMs that will be implemented to control pollutants in stormwater discharges . A list of standard and
commonly use CM is provided . The information also includes the expected level of information for each CM . The
expected level of information must address the following :
o What CMs will be installed ? Select and describe CMs .
o When will the CMs be implemented and removed ? Timing , temporary or permanent . All CMs shall be installed as a phased
operation as construction progresses .
o Where will the CMs be implemented ? Location .
o How will the CMs be maintained ? Describe the maintenance and inspection procedures . Include protocols , thresholds , and
schedules for cleaning , repairing or replacing damaged or failing CMs .
If a construction project uses a CM that is not included below , add the CMs and ensure that the expected level of
information is included .
Place CM detail drawings in Appendix 5 . Use Urban Drainage Flood Control District ' s Detail Drawings :
https : / / udfcd . org / wp -
content / uploads / uploads / vol3 % 2Ocriteria % 2Omanual / Chapter % 207 % 2OConstruction % 2OBMPs . pdf
Indicate on the sections below which permanent ( structural ) or temporary ( non - structural ) control
measure will be implemented to prevent stormwater pollution according to the following priorities :
1 . Minimize Disturbed Area and Protect Natural Features and Soil
■ Limits of Construction ( LOC )
■ Construction Phasing ( CP )
■ Protection of Existing Vegetation ( PV ) SM - 2
2 . Control Stormwater Flowing onto and through the Project
■ Temporary Slope Drains ( TSD ) EC - 7
■ Earth Dikes / Drainage Swales ( ED / DS ) EC - 10
■ Sediment Trap ( ST ) SC - 8
■ Temporary Diversion Channel ( TDC ) SM - 8
■ Dewatering Operations ( DW ) SM - 9
3 . Soil Stabilization and Slope Protection
■ Surface Roughening ( SR ) EC - 1
■ Temporary and Permanent Seeding ( TS / PS ) EC - 2
■ Soil Binders ( SB ) EC - 3
20
■ Mulching ( MU ) EC - 4
■ Rolled Erosion Control Product ( RECP ) EC - 6
■ Temporary Slope Drain ( TSD ) EC - 7
■ Temporary Outlet Protection ( TOP ) EC - 8
■ Earth Dikes / Drainage Swales ( ED / DS ) EC - 10
■ Terracing ( TER ) EC - 11
■ Check Dams ( CD ) EC - 12
■ Streambank Stabilization ( SS ) EC - 13
■ Wind Erosion / Dust Control ( DC ) EC - 14
4 . Storm Drain Inlet Protection
■ Rock Sock ( RS ) SC - 5
■ Inlet Protection ( IP ) SC - 6
5 . Perimeter Controls and Sediment Barriers
■ Construction Fence ( CF ) SM - 3
■ Vehicle Tracking Control ( VTC ) SM - 4
■ Vegetated Buffer ( VB ) SC - 9
6 . Retention of Sediment On - Site
■ Silt Fence ( SF ) SC - 1
■ Sediment Control Log ( SCL ) SC - 2
■ Straw Bale Barrier ( SBB ) SC - 3
■ Sediment Basin ( SB ) SC - 7
■ Sediment Trap ( ST ) SC - 8
7 . Construction Entrance / Exit Stabilization
■ Vehicle Tracking Control ( VTC ) SM - 4
■ Stabilized Construction Roadway ( SCR ) SM - 5
■ Stabilized Staging Area ( SSA ) SM - 6
■ Street Sweeping ( SS ) SM - 7
8 . Additional CMs
■ Concrete Washout Areas ( CWA ) MM - 1
■ Stockpile Management ( SP ) MM - 2
■ Paving and Grinding Operations ( PGO ) SM - 12
■ Temporary Cement Mixing Station MM - 3
21
2 . 1 Minimize Disturbed Area & Protect Natural Features and Soil
Instructions :
- Select methods ( signs , construction fence ) to protect unique site feature or sensitive area that shall not be
disturbed . Describe how each unique site feature or sensitive area identified earlier will be protected during
construction activity . Include these areas and associated measures on the EC Plan ( site map ) .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Limits of Construction ( LOC) Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent X Temporary
What : LOC is use to designate the area of land that will be disturbed by construction
Description activities .
When : The permitted LOC shall be designated prior to land disturbing activities . If land
Installation is disturbed outside of the limits , then the State and Local stormwater
construction discharge permits and SWMP / EC Plan must be amended .
Where :
Location The permitted LOC shall be identified on the EC Plan .
•
How : LOC are typically delineated by silt fence or construction fence . Inspect LOC
Maintenance continuously and maintain the permitted LOC in an effort to not disturb land
& Inspection outside of the boundaries .
Construction Phasing ( CP) Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent X Temporary
What : CP is scheduling and sequencing of land disturbing activities to limit erosion on
Description dormant parts of the site .
When :
Installation At planning
Where :
Location The permitted CP shall be identified on the SWMP / EC Plan .
•
How :
Maintenance At least establish CMs for initial , interim and final phase .
& Inspection
22
Protection of Existing Vegetation (PV) SM - 2 Used : No Phase ( s ) : N / A
Permanent H Temporary
What : A construction fence shall be installed around native areas that require
Description protection . It may also be necessary to install perimeter controls to prevent
sediment loading to those sensitive areas .
When : CMs installed for protection of existing vegetation shall be installed prior to
Installation land disturbing activities or as part of the phasing of the construction project .
Where :
Location PV shall be installed at locations identified on the SWMP as a preservation area .
Install and maintain PV per detail SM - 2 ( Appendix 5 ) . Clearly mark the area on
the EC plan to be preserved . No stockpiles , equipment , trailers or parking shall
be allowed within the area . Repair or replace damaged or displaced protective
How : barriers around the vegetated area . Inspect and maintain all areas that are
Maintenance designated to be protected . If damage to the vegetation occurs in a protected
& Inspection area , reseed the area with the same or similar species . Construction equipment
must not enter a wetland area , except as permitted by the U . S . Army Corps of
Engineers ( USAGE ) . In advertent placement of fill in a wetland is a 404 permit
violation and requires notification to the USAGE .
23
2 . 2 Control Stormwater Flowing onto and through the Project
______
Instructions :
- Select practices to divert flows from exposed soils , retain or detain flows , or otherwise limit runoff and the
discharge of pollutants from exposed areas of the site .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Temporary Slope Drains ( TSD ) EC- 7 Used : No Phase ( s ) : N / A
Permanent I 1 Temporary
What : TSD is a pipe or culvert use to convey water down a slope where there is high
Description potential for erosion . A collection system at the top of the slope directs runoff
to the conveyance . The pipe outlet must be equipped with outlet protection .
When : Install TSD prior to up - gradient land disturbing activities and maintain in place
Installation until no longer needed , but remove prior to the end of construction .
Where : TSD shall be installed at the locations identified on the SWMP . They are for
Location long , steep slopes where there is a high potential for flow concentration .
TSD shall be installed and maintained per detail EC - 7 ( Appendix 5 ) . Inspect and
How : maintain all TSD throughout construction . Inspect the entrance for sediment
Maintenance accumulation . Inspect the downstream outlet for signs of erosion and stabilize ,
& Inspection as needed . Remove accumulated sediment at the entrance and outfall , and
inspect pipe anchors to ensure they are secure .
Earth Dikes/Drainage Swales ( ED/DS) EG10 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent I 1 Temporary
What : ED/DS are temporary storm conveyance channels used to divert runoff around
Description slopes or to convey runoff to additional sediment control CMs prior to
discharge from the site .
When : Install ED / DS immediately upon completion of channel grading and maintain in
Installation place until the end of construction .
Where : ED / DS shall be installed at the locations identified on the SWMP . Typically
Location installed around steep slopes or as temporary conveyance feature leading to a
sediment basin or trap .
ED / DS shall be installed per detail EC - 10 ( Appendix 5 ) . Continuously inspect and
How : maintain all ED / DS for stability , compaction and signs of erosion and repair .
Maintenance Inspect side slopes for erosion and damage to erosion control fabric . Stabilize
& Inspection slopes and repair fabric as necessary . Accumulated sediment shall be removed
when the sediment has accumulated to %z of the depth of the ED / DS .
24
Sediment Trap (ST) SC - 8 Used : No Phase ( s ) : N / A
Permanent H Temporary
What : ST is an excavated or bermed area designed to capture drainage , allowing
Description settling of sediment from a disturbed area upstream smaller than 1 acre .
When : ST shall be installed prior to land disturbing activities . The ST shall not be
Installation removed until the upstream area is stabilized .
Where : ST shall be installed at the locations identified on the SWMP . It shall be installed
Location across a low area or drainage Swale .
ST shall be installed per detail SC - 8 ( Appendix 5 ) . Inspect regularly and maintain
How : the ST embankments for stability and seepage . Inspect the ST outlet for debris
Maintenance and damage . Repair damage to the outlet , and remove all obstructions .
& Inspection Accumulated sediment shall be removed when it reaches %z the height of the
outflow embankment .
Temporary Diversion Channel ( TDC ) SM - 8 Used : No Phase ( s ) : N / A
Permanent X Temporary
What : TDC diverts water from a stream to allow for construction activities to take
Description place underneath or in the stream .
When : TDC shall be installed prior to the start of any construction activities within a
Installation stream . The TDC shall be removed when the work at the down gradient or
natural channel is no longer required . The TDC shall be backfilled and stabilized .
TDC shall be installed at the location identified on the SWMP . TDC can be used
Where : in the following locations : construction of detention ponds , dams , in - stream
Location grade control structures , utility installations or any activity that requires work
in a waterway .
How : TDC shall be installed per detail SM - 8 ( Appendix 5 ) . Inspect frequently and
Maintenance maintain all TDC throughout construction . Inspect flow barriers at the start and
& Inspection end of each workday . Inspect TDC for signs of erosion . Repair or replace the
lining if necessary .
Dewatering Operations ( DW) SM - 9 Used : No Phase ( s ) : N / A
Permanent I 1 Temporary
DW involves pumping water from an inundated area to a CM , then downstream
What : to a receiving waterway , sediment basin or well - vegetated area . When
Description pumping water outside of the permitted boundary a separate State of Colorado
Dewatering Permit is required .
25
When : DW is needed when an area of the construction site is inundated with water as
Installation a result of a large storm event , groundwater or existing ponding conditions .
Remove DW once the work is no longer required .
Where : Install DW at the locations identified on the SWMP . DW may occur in any area
Location of the site where accumulated water needs to be removed .
How : DW shall be conducted per detail SM - 9 ( Appendix 5 ) . All dewatering discharges
Maintenance must be treated to remove sediment ( and other pollutants ) before discharging
& Inspection from the construction site . Inspect DW regularly and maintain operations
throughout construction .
Temporary Stream Crossing ( TSC) SM - 10 Used : No Phase ( s ) : N / A
Permanent X Temporary
TSC is needed where an actively flowing watercourse must be crossed . Crossing
What : methods : culvert crossing , stream ford and temporary bridge . A 404 permit is
Description required for placement of fill in a waterway from the U . S . Army Corps of
Engineers per Section 404 of the Clean Water Act .
When : Install a TSC only when it is necessary to cross a stream ; and remove it when
Installation the crossing is no longer needed for construction .
Where :
Location TSC shall be installed at the locations identified on the SWMP .
How :
Maintenance TSC shall be installed per detail SM - 10 ( Appendix 5 ) . Inspect and maintain TSC
& Inspection throughout construction . Inspect for bank erosion and in - stream degradation .
26
2 . 3 Soil Stabilization and Slope Protection
Instructions :
- Soil Stabilization : Select controls to stabilize exposed soils where construction activities have temporarily or
permanently ceased and measures to control dust generation .
- Slope Protection : Select controls that will be implemented to protect slopes from eroding .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Surface Roughening (SR) EC- 1 Used : Yes Phase ( s ) : 1 , 2
Permanent X Temporary
What : SR is tracking , scarifying , imprinting or tilling a disturbed area to provide
Description temporary stabilization . Variations in the soil are created to help minimize wind
and water erosion .
When : SR shall be performed either after final grading or to temporarily stabilize an
Installation area during active construction .
Where : SR shall be used in the locations identified on the SWMP . It can be used on mild
Location and steep slopes .
SR shall be installed per detail EC - 1 ( Appendix 5 ) . SR shall always be
How : perpendicular to the slope . Continuously inspect and maintain all surfaces that
Maintenance are roughened throughout construction . SR shall be inspected for erosion as it
& Inspection is only a temporary control . Vehicles and equipment shall not be driven over
areas that have been surface roughening . Refresh SR as needed .
Temporary and Permanent Seeding ( TS/PS) EC- 2 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent I Temporary
Seed is applied to disturbed areas in an effort to establish vegetation . TS is used
to stabilize disturbed areas that will be inactive for an extended period . PM is
used to stabilize areas at final grade that will not be otherwise stabilized .
What : Effective seeding includes preparation of a seedbed , selection of an
Description appropriate seed mixture , proper planting techniques , and protection of the
seeded area with mulch , geotextile , or other appropriate measures . Mulching
helps to protect the bare soil and must be secured by crimping , tackifiers ,
netting or other measures . Site specific soil amendment and seed mix
specifications must be included in the SWMP .
When : TS / PS shall be performed on temporary inactive surfaces and following the
Installation completion of final grading .
Where : TS / PS shall be completed in the locations identified on the SWMP to stabilize
Location areas at final grade that will not otherwise be stabilized .
27
TS / PS and secured mulching shall be installed per seed mix specifications and
How : detail EC - 2 ( Appendix 5 ) . Continuously inspect and maintain TS / PS and secured
Maintenance mulch throughout construction . Prepare the seedbed , select an appropriate
& Inspection seed mixture , use proper planting techniques and protect the seeded area with
secured mulch .
Soil Binders ( SB) EC - 3 Used : No Phase ( s ) : N / A
Permanent X Temporary
What : SB involves a broad range of treatments that can be applied to exposed soils
Description for temporary stabilization to reduce wind and water erosion .
When : Use SB for short term temporary stabilization . Soil binders can break down fast
Installation due to natural weathering .
Where : SB can be used on mild and steep slopes including stockpiles . They are often
Location used in areas where work has temporarily stopped , but is expected to resume
before revegetation can be established .
How : SB shall be used per detail EC - 3 ( Appendix 5 ) . Continuously inspect and
Maintenance maintain all areas where SB have been applied throughout construction . SB can
& Inspection fail after heavy rainfall events and may require re - application . In particular , SB
will generally experience spot failures during heavy rainfall events .
Mulching (MU) EC- 4 Used : No Phase ( s ) : N / A
Permanent I Temporary
What : MU consists of evenly applying straw , hay , shredded wood mulch , bark or
Description compost to disturbed soils and securing the mulch by crimping , tackifiers or
netting .
MU is used in conjunction with TS / PS to help protect the seed bed and stabilize
When : the soil . Mulch can also be used as a temporary cover on low to mild slopes to
Installation help temporarily stabilize disturbed area where there are growing season
constraints . After MU application , there shall not be bare ground surface
exposed . Reapply mulch , as needed , to cover bare areas .
Temporary and / or permanent MU shall be completed in the locations
Where : identified on the SWMP .
Location
MU shall be installed per detail EC - 4 ( Appendix 5 ) . After MU , the bare ground
How : surface shall not be more than 10 % exposed . Re - apply mulch , as needed , to
Maintenance cover bare areas .
& Inspection
28
Rolled Erosion Control Product ( RECP) EC- 6 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent H Temporary
RECP consist of a variety of temporary or permanently installed manufactured
What : products designed to control erosion and enhance vegetation establishment
Description and survivability , especially on slopes and in channels . Categories of RECP :
mulch control netting , open weave textile , erosion control blanket , and turf
reinforcement mat .
When : RECP shall be installed upon completion of slope grading and when
Installation revegetation measures are completed . RECP are biodegradable typically and
do not need to be removed after construction .
Where : RECP shall be installed at the locations identified on the SWMP . Install RECP
Location according to manufacturer ' s specifications .
How : RECP shall be installed per EC - 6 ( Appendix 5 ) . Continuously inspect and
Maintenance maintain all RECP throughout construction . Check for signs of erosion , including
& Inspection voids under the mat . Also check for damaged or loose stakes and secure loose
sections of the blanket .
Temporary Slope Drain ( TSD ) EC- 7 Used : No Phase ( s ) : N / A
Permanent I Temporary
What :
Description Refer to Section 2 . 2
When :
Installation Refer to Section 2 . 2
Where :
Location Refer to Section 2 . 2
How :
Maintenance Refer to Section 2 . 2
& Inspection
Temporary Outlet Protection ( TOP) EC- 8 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent H Temporary
What : TOP consist of riprap rock placed at the outlet to help reduce erosion
Description immediately downstream of a pipe , culvert , slope drain rundown or other
conveyance with concentrated flow . TOP is intended for less than 2 years .
When : TOP shall be installed immediately upon the completion of grading and
Installation removed once the pipe is no longer draining upstream area or once the
downstream area has been sufficiently stabilized .
Where : TOP shall be installed at the locations identified on the SWMP , where there is
Location a potential for accelerated erosion due to concentrated flow .
29
How : TOP shall be installed and maintain per EC - 8 detail ( Appendix 5 ) . The Inspect
Maintenance regularly and maintain TOP as the rocks may be displaced . Accumulated
& Inspection sediment shall be removed before the TOP becomes buried and ineffective .
Earth Dikes/Drainage Swales ( ED/DS) EC- 10 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent I 1 Temporary
What :
Description Refer to Section 2 . 2
When :
Installation Refer to Section 2 . 2
Where :
Location Refer to Section 2 . 2
How :
Maintenance Refer to Section 2 . 2
& Inspection
Terracing ( TER) EC- 11 Used : No Phase ( s ) : N / A
I i Permanent I 1 Temporary
TER consists of grading steep slopes into a series of relatively flat sections
What : separated at intervals by steep slope segments . They shorten the
Description uninterrupted flow lengths on steep slopes , reducing the development of rills
and gullies .
When : TER shall be completed during grading activities ; when slope is at final grade ,
Installation and vegetation shall be established as soon as possible .
Where : TER shall be installed at the locations identified on the SWMP . It is usually used
Location to control erosion on slopes that are steeper than 4 : 1 .
How : TER shall be installed per detail EC - 11 ( Appendix 5 ) . TER shall be used in
Maintenance combination with other stabilization measures that provide cover for exposed
& Inspection soils . Inspect regularly and maintain all TER throughout construction . Remove
accumulated sediment and repair rill erosion as necessary .
Check Dams ( CD ) EG12 Used : No Phase ( s ) : N / A
Permanent I 1 Temporary
What : CDs are temporary or permanent grade control structures use in drainage
Description channels to reduce the velocity of runoff and concentrated flows . They can be
constructed from rock , gravel bags , sand bags or proprietary devices .
30
When : CD shall be installed prior to earth disturbing activities or immediately upon
Installation completion of channel grading . Temporary CDs shall be removed and area shall
be stabilized . Permanent CDs shall be cleaned and remain in place .
Where : CD shall be installed at the locations identified on the SWMP . Typically they are
Location placed in drainage channels , swales or on mild to moderate steep slopes .
CDs shall be installed per detail EC - 12 ( Appendix 5 ) . They shall be placed at
How : regularly spaced intervals along the drainage Swale or ditch . The height of the
Maintenance CD shall allow for pooling of the runoff . Inspect regularly and maintain CD as
& Inspection rocks can be displaced and gravel bags or sandbags can be torn . Accumulated
sediment shall be removed before it reaches %z the height of the CD .
Streambank Stabilization ( SS ) EC- 13 Used : No Phase ( s ) : N / A
Permanent I Temporary
What : SS is a combination of erosion and sediment control measures to protect
Description streams , banks , and in - stream habitat from accelerated erosion . Some of the
measures include PV , CD , TS / PS and RECP .
SS shall be installed prior to earth disturbing activities to protect existing
When : vegetation , preserve exposed streambank , or mitigate erosion rates from
Installation disturbed area . SS measures that will not remain in place as a part of final
stabilization , such as silt fence , shall be removed when all land disturbing
activities have ceased and the area has been permanently stabilized .
Where : SS shall be installed at the locations identified on the SWMP . They shall be
Location installed along the banks of streams or waterways .
How :
Maintenance SS shall be installed per detail EC - 13 ( Appendix 5 ) . Inspect regularly and
& Inspection maintain SS throughout construction .
Wind Erosion/Dust Control ( DC) EC- 14 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent H Temporary
What : DC helps keep sediments ( from soils and stockpiles ) from entering the air as a
Description result of land disturbing construction activities . A variety of practices that focus
on grading disturbed areas may be used .
When : Implement DC during conditions which result in dust from either construction
Installation activities or from naturally occurring winds . Do not overwater .
Where : Dust abatement shall be completed throughout the project area where any
Location material exists that has the potential to become airborne .
How :
Maintenance DC measures shall be performed per detail EC - 14 ( Appendix 5 ) . Apply water or
& Inspection magnesium chloride , seed and mulch or use spray - on soil binders on disturbed
31
areas . Water and magnesium chloride shall be applied such that concentrated
flows do not form .
32
2 . 4 Storm Drain Inlet Protection
Instructions :
- Select controls , including design specifications and details , that will be implemented to protect storm drain
inlets receiving stormwater from the project .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Rock Sock ( RS) SC - 5 Used : Yes Phase ( s ) : 1 , 2 , 3
I i Permanent I 1 Temporary
What : RS is an elongated cylindrical filter constructed of gravel wrapped by wire mesh
Description or woven geotextile ( aka " curb socks " if placed at angles at curb line ) .
When : Install RS prior to land disturbing activities ; once upstream stabilization is
Installation complete . Accumulated sediment shall be removed and properly disposed of .
Where : RS shall be installed at the locations identified on the EC Plan . They are use for
Location perimeter control of a disturbed area , or as part of IP .
How : Install RS per detail SC - 5 ( Appendix 5 ) . Inspect regularly and maintain RS as they
Maintenance are susceptible to displacement and breakage due to vehicle traffic .
& Inspection Accumulated sediment shall be removed to maintain functionality .
Inlet Protection ( IP ) SC- 6 Used : Yes / No Phase ( s ) : 1 , 2 , 3
Permanent I 1 Temporary
What : IP is a permeable barrier that is installed around an inlet drain to filter runoff
Description
and remove sediment before entering the storm system . IP can be constructed
of : RS , SCL , SF , blocks and RS , or other materials .
Install IP for existing catch basins prior to land disturbing activities upslope from
When : the inlet . IP for proposed catch basins shall be installed immediately after the
Installation drain is constructed . IP and associated sediment must be removed and properly
disposed of when the drainage area upstream is stabilized .
Where : Install IP at the locations identified on the EC Plan . IP is not astand - alone
Location measure . It shall be used in conjunction with other up gradient measures .
Install IP per detail SC - 6 ( Appendix 5 ) . IP shall enable the drain to function
How : without completely blocking the flow . Inspect regularly and maintain IP
Maintenance throughout construction as it is the final measure before runoff enters the
& Inspection storm drain . Accumulated sediment shall be removed when it has reached %z of
the height of the IP or looses functionality , whichever comes first . IP is not
standalone measure and shall be part of redundant system .
33
2 . 5 Perimeter Control & Sediment Barriers
__
Instructions :
- Select measures , including design specifications and details , to filter and trap sediment before it leaves the
construction site .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Construction Fence ( CF) SM - 3 Used : No Phase ( s ) : N / A
Permanent I 1 Temporary
CF restricts site access to designated entrances and exits , delineates
What : construction site boundaries , and keeps construction out of sensitive locations
Description such as natural areas to be preserved as open space , wetlands and riparian
areas .
When : CF shall be installed prior to earth disturbing activities ; and removed once
Installation construction is complete .
Where : Install CF along the site perimeter or any area within the site where access shall
Location be restricted .
How : CF shall be installed , maintained and removed per detail SM - 3 ( Appendix 5 ) .
Maintenance Inspect CF for damages and slumping . The CF shall be tight and any areas with
& Inspection slumping or fallen posts shall be reinstalled or replaced .
Vehicle Tracking Control ( VTC) SM - 4 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent I I Temporary
What : VTC is a stabilized site access point that helps remove sediment from vehicle
Description tires and reduces tracking of sediment onto paved surfaces .
When : Install VTC prior to any land disturbing activities ; and removed when there is
Installation no longer the potential for vehicle tracking to occur .
Where : VTC shall be installed at the location identified on the SWMP . Locate VTC where
Location frequent vehicle traffic will exit the construction site onto a paved roadway .
VTC shall be installed per detail SM - 4 ( Appendix 5 ) . All VTC must have non -
woven geotextile fabric between the soil and rock pad . Recycled concrete
How : aggregate is not allowed because concrete dust elevates pH in stormwater .
Maintenance Inspect regularly and maintain VTCs throughout construction . If the area
& Inspection becomes clogged with sediment , remove and dispose of excess sediment or
replace material with a fresh layer of rock . Any sediment that is tracked onto
adjacent roadways shall be cleaned with brooms , shovels ( no water washing ) ,
or mechanically cleaned with a street vacuum sweeper .
34
Vegetated Buffer ( VB) SC- 9 Used : No Phase ( s ) : N / A
Permanent H Temporary
What : VB is the preservation of natural vegetation to protect waterways and
Description Wetlands . A VB may be required as a type of setback from a natural waterway .
It shall be used in conjunction with other perimeter measures .
When :
Installation VB shall be pre - existing of land disturbing activities .
Where : VB shall be installed at the locations identified on the SWMP . VB shall be use
Location with additional measures to separating land disturbing activities .
How : VB shall be installed per detail SC - 9 ( Appendix 5 ) . Inspect regularly and maintain
Maintenance VB throughout construction . Inspect for signs of erosion . VB shall not be used
& Inspection as standalone measure and shall be part of redundant system .
2 . 6 Retention of Sediment On - Site
Instructions :
- Select sediment control practices , including design specifications and details ( volume , dimensions , outlet
structure ) that will be implemented at the construction site to retain sediments on - site .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Silt Fence (SF) SC4 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent 1 1 Temporary
What : SF is a woven geotextile fabric attached to wooden posts and trenched into the
Description ground . It is use to intercept sheet flow runoff from disturbed areas .
When : SF shall be installed prior to land disturbing activities . SF shall be removed when
Installation the upstream area is stabilized .
SF shall be installed at the locations identified on the SWMP . SF is typically
Where : installed along the contour of slopes , which is down slope of a disturbed area
Location to accept sheet flow , and placed along the perimeter of a construction site . SF
is not designed to receive concentrated flow, or to be used a filter fabric .
How : SF shall be installed per detail SC - 1 ( Appendix 5 ) . Inspect regularly and maintain
Maintenance SF throughout construction . Any section of SF that has a tear , hole , slumping ,
& Inspection undercutting or has been bypassed shall be replaced . Accumulated sediment
shall be removed before it reaches a depth of 6 inches .
35
Sediment Control Log (SCL ) SC - 2 Used : Yes Phase ( s ) : 1 , 2 , 3
1 Permanent H Temporary
What : SCL , aka " Straw Wattle " , is a linear roll made of natural materials ( straw ,
Description coconut fiber or other fibrous material ) , trenched into the ground and held
with wooden stakes , used to intercept sheet flows from disturbed areas .
SCL shall be installed during land disturbing activities and it may also be
When : installed after formation of a stockpile . Once the upstream area is stabilized ,
Installation remove and properly dispose of the SCL . If disturbed areas exist after removal ,
the area shall be covered with top soil , seeded and mulched .
SCL shall be installed at the locations identified on the ECSP . SCL are typically
used for stockpile control , IP , and CD in small drainage ditches , on disturbed
slopes to shorten flow lengths and / or as part of multi - layered perimeter
Where : control along receiving water such as a stream , pond or wetland . SCL work well
Location in combination with other layers of erosion and sediment controls . Stockpiles
stored on impervious surfaces shall not be placed in a flowline and SCL shall be
weighted . Stockpiles stored on pervious surfaces may be protected by pervious
SCL , SF or adequate vegetative cover .
How : SCL shall be installed per detail SC - 2 ( Appendix 5 ) , along ( parallel ) the slope
Maintenance contour to avoid concentrating flows . Inspect regularly and maintain SCL
& Inspection throughout construction as they will eventually degrade . Accumulated
sediment shall be removed before the depth is % the height of the SCL .
Straw Bale Barrier ( SBB ) SC- 3 Used : No Phase ( s ) : N / A
I 1 Permanent I I Temporary
What : SBB is a linear barrier of straw bales used to intercept and capture sheet flow
Description and to trap sediment before runoff exits a disturbed area . Typically used as CD ,
or as IP .
When : Install SBB prior to land disturbing activities . Remove and properly dispose of
Installation the SBB once the upstream area has been stabilized . Areas of disturbance
beneath the SBB shall be seeded and mulched when bales are removed .
Where :
Location Straw bale barriers shall be installed at the locations identified on the ECSP .
How : SBB shall be installed per detail SC - 3 ( Appendix 5 ) . Inspect regularly and
Maintenance maintain SBB throughout construction as they may be bypassed or undercut by
& Inspection flows and will degrade and rot . Accumulated sediment shall be removed when
the depth reaches % the height of the bale .
36
Sediment Basin ( SB) SC- 7 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent H Temporary
What : SB is a temporary structure designed to capture sediment transported in runoff
Description and slowly release flows to allow time for settling of the sediment prior to
discharge from the site
Install SB prior to land disturbing activities . SBs are typically converted to
When : permanent detention basins . For conversion , remove accumulated sediment
Installation and re - configure the basin and outlet to meet the requirements of the final
design . For SB that are temporary , remove when is no longer needed by filling
in the excavated area with soil and stabilizing accordingly .
Where : SB shall be installed at the locations identified on the SWMP . Where feasible ,
Location the SB shall be installed in the same location where a permanent post -
construction detention basin will be located .
How : The SB shall be installed per detail SC - 7 ( Appendix 5 ) . Inspect regularly and
Maintenance maintain SB to be effective . Accumulated sediment shall be dredged from the
& Inspection basin when it reaches no more than %3 of the design storage volume .
Sediment Trap (ST) SC - 8 Used : No Phase ( s ) : N / A
Permanent H Temporary
What : ST is an excavated or bermed area designed to capture drainage , allowing
Description settling of sediment from upstream disturbed area smaller than 1 acre .
When : Install ST prior to land disturbing activities . The ST shall not be removed until
Installation the upstream area is sufficiently stabilized .
Where : Install ST in the locations identified on the SWMP . It shall be installed across a
Location low area or drainage Swale .
ST shall be installed per detail SC - 8 ( Appendix 5 ) . Inspect regularly and maintain
How : the ST throughout construction . Inspect the embankments for stability and
Maintenance seepage , and the outlet for sediment , debris and damage . Repair damage to
& Inspection the outlet , and remove all obstructions . Accumulated sediment shall be
removed when it reaches % the height of the outflow embankment .
37
2 . 7 Construction Entrance/Exit Stabilization
Instructions :
- Select CM to stabilize vehicle entrance ( s ) and exit ( s ) to minimize off- site vehicle tracking of sediments and
discharges to stormwater .
- Indicate applicable measure by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of
construction during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent
( structural ) or Temporary ( non - structural ) . Add any additional CMs as needed .
Vehicle Tracking Control ( VTC) SM - 4 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent I Temporary
What :
Description Refer to Section 2 . 5
When :
Installation Refer to Section 2 . 5
Where :
Location Refer to Section 2 . 5
How :
Maintenance Refer to Section 2 . 5
& Inspection
Stabilized Construction Roadway (SCR) SM - 5 Used : No Phase ( s ) : N / A
Permanent I 1 Temporary
SCR is a temporary method to control sediment runoff , vehicle tracking , and
What : dust from roads during construction activities consisting of aggregate base
Description course of 3 - inch diameter granular material ( recycled concrete aggregate is not
allowed because concrete dust elevates pH in stormwater ) .
SCR is installed on high traffic construction roads to minimize dust and erosion ,
When : and use in place of rough cut street controls on roadways with frequent
Installation construction and vehicle traffic . Gravel shall be removed once the road is ready
to be paved . Prior to paving , the road should be inspected for grade changes
and damage . Re - grade and repair as necessary .
Where : SCR shall be installed at the locations identified on the SWMP . Apply gravel to
Location disturbed areas that are used as a route for vehicles .
How : SCR shall be installed per detail SM - 5 ( Appendix 5 ) . Inspect regularly and
Maintenance maintain SCR throughout construction . A stable surface cover of rigid gravel
& Inspection shall be maintained as well as repairing any perimeter controls . Inspect
drainage ditches along the roadway for erosion and stabilize as needed .
38
Stabilized Staging Area (SSA ) SM - 6 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent H Temporary
What : SSA is a clearly designated area where construction equipment and vehicles ,
Description stockpiles , waste bins and other construction - related materials are stored . If
the construction site is big , more than one SSA may be necessary .
When :
Installation SSA shall be installed prior to any land disturbing activities .
Where :
Location SSA shall be installed at the location identified on the SWMP .
How : SSA shall be installed per detail SM - 6 ( Appendix 5 ) . Inspect regularly and
Maintenance maintain SSA throughout construction . A stable surface cover of rigid gravel
& Inspection shall be maintained as well as repairing any perimeter controls and following
good housekeeping practices .
Street Sweeping ( SS ) SM - 7 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent I 1 Temporary
What : SS is used where vehicles track sediment onto paved roadways to reduce the
Description transport of it into storm drain systems or surface waterways .
Manual SS or mechanical vacuuming SS shall be conducted when there is
When : noticeable sediment accumulation on roadways adjacent to the construction
Installation site . SS shall be completed prior to any precipitation events , at the end of the
workday as needed , and at the end of construction .
Where : SS shall be utilized throughout the site and also on adjacent areas to
Location construction .
How : SS shall be performed per detail SM - 7 ( Appendix 5 ) . Use standard SS equipment
Maintenance to adequately remove sediment from roadways adjacent to the construction
& Inspection site .
39
2 . 8 Additional Control Measures ( CMs)
._
Instructions :
Indicate applicable CMs by selecting the blue Yes / No then type " Yes " or " No " . Identify the phase of construction
during which the CM will be implemented : 1 , 2 , or 3 , and check whether the CM is Permanent ( structural ) or
Temporary ( non - structural ) . Add any additional CMs as needed .
Concrete Washout Areas ( CWA ) MM - 1 Used : Yes Phase ( s ) : 1 , 2 , 3
I i Permanent I 1 Temporary
What : CWA is a specific area for concrete washing activities . It can be an excavation
Description of a pit in the ground , above ground storage area or prefabricated haul - away
container .
CWA shall be installed prior to any concrete delivery to the construction site ;
When : and remove upon termination of use of the washout . Accumulated solid waste ,
Installation including concrete waste and any contamination soils , must be removed from
the site to a designated disposal location .
CWA shall be installed at the locations identified on the SWMP . Lined CWA if
Where : the groundwater table is high ; or if the CWA will be placed within 400 ft of a
Location natural drainage pathway / waterbody ; or within 1 , 000 ft of a wells or drinking
water source .
How : CWA shall be installed per detail MM - 1 ( Appendix 5 ) . Inspect regularly and
Maintenance maintain CWA throughout construction . Ensure adequate signage is in place
& Inspection identifying the location of the CWA . Remove concrete waste when filled to
about %3 of CWA capacity to maintain functionality .
Stockpile Management ( SP ) MM - 2 Used : Yes Phase ( s ) : 1 , 2 , 3
Permanent H Temporary
What : SP includes measures to minimize erosion and sediment transport from
Description stockpiles . SP shall be used when soils or other erodible materials are stored .
SP locations shall be determined during construction . If temporary removal of
When : a CM is necessary to access the SP , ensure CMs area re - installed per detail
Installation drawing . When SP is no longer needed , properly dispose of excess materials
and re - vegetate or stabilize the ground surface where the SP was located .
Where : SP locations shall be placed away from areas where concentrated stormwater
Location flow is anticipated , major drainageways , gutters , and storm sewer inlets . SP
locations shall be noted on the SWMP .
How : SP shall be installed per detail MM - 2 ( Appendix 5 ) . Inspect regularly and
Maintenance maintain SP throughout construction . It is recommended to place SP on a
& Inspection pervious surface and protected from sediment transport with measures such
as SCL , VB and / or SF . SP are only allowed on impervious surfaces if no other
40
practical alternative exists . Provide weighted sediment control measures
around the perimeter of the SP , such as RS or sand bags .
Paving and Grinding Operations ( PGO) SM - 12 Used : Yes Phase ( s ) : 1 , 2 , 3
I 1 Permanent I 1 Temporary
Runoff management practices shall be used during all PGO . A variety of
What : management practices can be used such as : IP , perimeter controls , store
Description materials away from the storm sewer system , drainages and waterways , and
keep a spill kit onsite .
When : PGO shall be scheduled during dry weather . Recycle asphalt and pavement
Installation material when feasible . Material that cannot be recycled must be disposed of
properly .
Where : Use runoff management practices during all paving and grinding operations
Location such as surfacing , resurfacing , and saw cuts .
How :
Maintenance PGO shall be installed per detail SM - 12 ( Appendix 5 ) . Inspect regularly and
& Inspection maintain PGO throughout construction .
Temporary Cement Mixing Area MM - 3 Used : Yes Phase ( s ) : 1 , 2 , 3
I I Permanent I 1 Temporary
What : Contained area for concrete , cement , mortar , drywall , mud and stucco mixing
Description activities .
When : Install prior to any material mixing activity ; and remove upon termination of
Installation use of the area .
Where :
Location Installed at the locations identified on the SWMP .
How :
Maintenance Install per detail ( attach to Appendix 5 ) . Inspect regularly and maintain capacity
& Inspection throughout construction . Clean - up if there are spills .
41
SECTION 3 : CONSTRUCTION SITE PHASING & EC PLAN
3 . / Construction Site Phasing Summary
Instructions :
The SWMP and EC Plan ( Site Map ) shall clearly delineate the construction sequencing between the separate
phases of construction , and the CM / BMP implementation of the permanent and temporary CMs .
Using the information under Section 1 . 3 Nature and Sequence of Construction Activity , describe the
construction phase and the permanent or temporary CMs associated with each of the following 3 phases :
- Initial Construction = Phase I , Initial BMPICMs
- Interim Construction = Phase II , Interim BMP / CMs
- Final Construction = Phase III , Final BMPICMs
The EC Plan must identify location of the proposed CMs to be implemented during the 3 phases of construction .
Develop 3 separate phased detailed site maps ( one plan sheet representing one phase ; do not combine ) . Place
the EC Plan sheets in Appendix 6 . Place CMs details in Appendix 5 .
■ Initial Construction - Phase I
- Select applicable construction activities
Demolition
X Clearing , Grubbing , Tree and Shrub Removal
X Top Soil Stripping and Stock Piling
Grading
X Over - excavation / Soil conditioning
X Utility Installation
Dewatering
X Initial Control Measures ( CM )
X Stabilized Staging Area ( SSA ) SM - 6
VTC to enter / exit into public roads
X Perimeter Control
X Inlet Protection ( IP ) SC - 6 on existing site or off - site storm drains
Check Dams ( CD ) EC - 12
X Rock Sock ( RS ) SC - 5
X Silt Fence ( SF ) SC - 1
Sediment Control Log ( SCL ) SC - 2
X Sediment Basin ( SB ) SC - 7
Sediment Trap ( ST ) SC - 8
X Earth Dikes / Drainage Swales ( ED / DS ) EC - 10
Dewatering Operations ( DW ) SM - 9
X Stockpile Management ( SP ) MM - 2
X Surface Roughening ( SR ) EC - 1
X Temporary Seeding ( TS ) EC - 2
Soil Binders ( SB ) EC - 3
42
X Limits of Construction ( LOC )
Protection of Existing Vegetation ( PV ) SM - 2
X Employee Training
X Street Sweeping ( SS ) SM - 7
X Dust Control ( DC ) EG14
X Good Housekeeping Practices ( required )
X Spill Prevention , Containment and Control ( required )
X Covering Outdoor Storage and Handling Areas ( required )
■ Interim Construction - Phase II
- Select applicable construction activities
X Road Construction
Parkinglot Construction
Vertical Construction
Dewatering
X Interim Control Measures ( CM ) - BMPs / CMs associated with this Phase
Inlet Protection ( IP ) SC - 6 as new storm drains are constructed
X Outlet Protection ( OP )
Check Dams ( CD ) EC - 12
Rock Sock ( RS ) SC - 5
Installation of additional CMs at curbside , sidewalks , medians , and parking islands once
pavement is laid ( until landscape begins )
X VTC to enter / exit dirt lots from internal roads or parkinglot
X Concrete Washout Areas ( CWA ) MM - 1
X Temporary Cement Mixing Area
Stabilized Staging Area ( SSA ) SM - 6
X Silt Fence ( SF ) SC - 1
X Sediment Control Log ( SCL ) SC - 2
Sediment Basin ( SB ) SC - 7
Sediment Trap ( ST ) SC - 8
X Earth Dikes / Drainage Swales ( ED / DS ) EC - 10
Surface Roughening ( SR ) EC - 1
X Temporary Seeding ( TS ) EC - 2
Soil Binders ( SB ) EC - 3
Dewatering Operations ( DW ) SM - 9
X Stockpile Management ( SP ) MM - 2
X Limits of Construction ( LOC )
43
Protection of Existing Vegetation ( PV ) SM - 2
X Employee Training
X Street Sweeping ( SS ) SM - 7
X Dust Control ( DC ) EC - 14
X Good Housekeeping Practices ( required )
X Spill Prevention , Containment and Control ( required )
X Covering Outdoor Storage and Handling Areas ( required )
■ Final Construction - Phase III
- Select applicable construction activities
X Final Grade
X Top Soil Placement
Landscape ( per approved plan )
IX Removal of applicable temporary BMPs / CMs
X Permanent pond conversion + removal of sediments on the SB
X Final Stabilization - BMPs / CMs associated with this Phase
X Sod
Permanent Seeding & Mulching ( PS / MU )
X Erosion Control blankets ( RECP )
X Limits of Construction ( LOC )
Protection of Existing Vegetation ( PV ) SM - 2
X Employee Training
X Street Sweeping ( SS ) SM - 7
Dust Control
X Good Housekeeping Practices ( required )
X Spill Prevention , Containment and Control ( required )
X Covering Outdoor Storage and Handling Areas ( required )
44
3 . 2 General Notes
Instructions :
Refer to Appendix 13 for the General EC Plan Notes .
45
SECTION 4 : WASTE MANAGEMENT PLAN
Instructions :
Complete the Waste Management Plan below by describing site - specific pollution prevention CMs that will be
implemented to control pollutants in stormwater from construction sites . Indicate which of the following CM
categories are applicable for your construction site :
■ Covering Outdoor Storage and Handling Areas ( required )
■ Spill Prevention and Response Plan ( required )
■ Good Housekeeping ( required )
■ Vehicle Maintenance , Fueling and Storage ( required , if applicable )
■ Street Sweeping and Cleaning ( required , if applicable )
■ Storm Sewer System Cleaning ( required , if applicable )
46
4 . 1 Covering Outdoor Storage and Handling Areas
Instructions :
- Practices for outdoor storage and handling areas are required to be implemented in all 3 phases of construction
( initial , interim and final ) .
Covering Outdoor Storage and Handling Areas Used : Yes Phase ( s ) : 1 , 2 , 3
1 Permanent X Temporary Procedure
Description : When raw materials , byproducts , finished products , storage tanks , and other
materials are stored or handled outdoors , stormwater runoff that comes in contact with the
materials can become contaminated . Proactively covering storage and handling areas can be an
effective source control for such areas . Coverings can be permanent or temporary and consist of
tarp , plastic sheeting , roofing , enclosed structures , or other approaches that reduce exposure of
materials to precipitation and wind .
Uses : Covering is appropriate for areas where solids ( e . g . , gravel , compost , building materials ) or
liquids ( e . g . , oil , gas , tar ) are stored , prepared , or transferred . Cover the following areas that are
applicable to this construction site :
■ Loading and Unloading : Loading and unloading operations usually take place at outside
storage or staging area on the construction site . Materials may be spilled during transfer
between storage facilities and trucks during pumping of liquids , pneumatic transfer of dry
chemicals , and mechanical transfer of bags , boxes , drums , or other containers by material
handling equipment .
■ Aboveground Tanks / Liquid Storage : Accidental releases of chemicals from above - ground
liquid storage can contaminate stormwater with a variety of pollutants . Several common
causes of accidental releases from above - ground storage include : external corrosion and
structural failure , problems due to improper installation , spills and overfills due to
operator error , failure of piping systems , and leads or spills during pumping of liquids or
gases between trucks to a storage facility .
■ Outside Manufacturing : Common outside manufacturing activities may include parts
assembly , rock grinding or crushing , metals painting or coating , grinding or sanding ,
degreasing , concrete manufacturing , parts cleaning or operations that use hazardous
materials . These activities can result in dry deposition of dust , metal and wood shavings
and liquid discharges of dripping or leaking fluids from equipment or process and other
residuals being washed away in storm runoff . In addition , outside storage of materials
and waste products may occur in conjunction with outside manufacturing .
■ Waste Management : Wastes spilled , leached , or lost from outdoor waste management
areas or outside manufacturing activities may accumulate in soils or on other surfaces
and be carried away by storm runoff . There is also the potential for liquid wastes from
surface impoundments to overflow to surface waters or soak the soil where they can be
picked up by runoff . Possible stormwater contaminants include toxic compounds , oil and
grease , oxygen - demanding organics , paints and solvents , heavy metals and high levels of
47
suspended solids . Lack of coverage of waste receptacles can result in precipitation
seeping through the material and collecting contaminants or the material being blown
around the site and into the storm sewer system . Containment sources include waste
piles , wastewater and solid waste treatment and disposal , land application sites ,
dumpsters , or unlabeled drums .
■ Outside Storage of Materials : Raw materials , intermediate products , byproducts , process
residuals , finished products , containers , and materials storage areas can be sources of
pollutants such as metals , oils and grease , sediment and other contaminants . Pollutant
transport can occur when solid materials wash off or dissolve into water , or when spills
or leaks occur .
Practice Procedures :
■ Where practical , conduct operations indoors . If outdoors , then select a temporary or
permanent covering to reduce exposure of materials to precipitation and runoff .
■ The type of covering selected depends on a variety of factors such as the type and size of
activity being conducted and materials involved . Types of cover range from relatively
inexpensive tarps and plastic sheeting to overhead structures or fully enclosed buildings
equipped with ventilation , lighting , etc .
■ Covering practices should be combined with Good Housekeeping to be most effective .
■ Tarps and plastic sheets require more frequent inspection and maintenance .
Place site - specific information here :
48
4 . 2 Spill Prevention and Response Plan
Instructions : Implement spill prevention , containment and control practices during all 3 phases of construction .
Spill Prevention & Response Plan Used : Yes Phase ( s ) : 1 , 2 , 3
1 1 Permanent X Temporary Procedure
Spills and leaks of solid and liquid materials processed , handled or stored outdoors can be a
source of stormwater pollution . Spilled substances can reach receiving waters when runoff
washes these materials from impervious surfaces or when spills directly enter the storm system
during dry weather conditions . Effective controls depend on spill prevention and response
measures , proper training , and may include structural spill containment or control devices . Spill
containment measures include temporary or permanent curbs or berms that surround a
potential spill site . Berms may be constructed of concrete , earthen material , metal , synthetic
liners , or other material . Spill control devices include valves , slide gates , or other devices that can
control and contain spilled material .
Spill Prevention Measures
■ Train key employees in plan and provide clear , common - sense spill prevention practices
and clean - up procedures to be strictly followed .
■ Identify equipment that is exposed to precipitation , pollutants that may be generated and
possible sources of leaks or discharges .
■ Perform inspections and preventative maintenance of equipment for proper operation
and to check for leaks or evidence of discharge ( stains ) . Ensure repairs are completed or
provide temporary leak containment until such repairs can be made .
■ Drain used motor oil and other automotive fluids in a designated area away from storm
inlets . Collect spent fluids and recycle or dispose of properly . Never dispose into storm or
sanitary sewer .
■ In fueling areas , clean up spills with dry methods ( absorbents ) and use damp cloths on
gas pumps and damp mops on paved surfaces .
■ Never hose down a spill or absorbent materials into the storm drain , or down into an
interior floor drain which leads to the sanitary sewer system .
■ Reduce stormwater contact with equipment and materials by implementing covered
storage , reduce stormwater run - on and follow good housekeeping practices .
■ Post signs at critical locations with Spill Prevention and Response Plan information .
Identification of Spill Areas : Spill prevention and response measures shall be implemented at
construction sites in areas where materials may be spilled in quantities that can adversely impact
receiving waters or the storm system . Identify potential spill areas , potential spill volumes ,
material types , frequency of material used , and drainage paths from spill areas with relation to
storm sewer inlets , adjacent water bodies , structural CMs , and containment structures . Use this
information to determine the types of spill prevention and control measures needed specific to
the site conditions . Show the potential spill areas on the EC Plan :
49
■ Loading and unloading areas
■ Outdoor storage areas
■ Outdoor manufacturing or processing activities
■ Waste disposal
■ Areas that generate significant dust or particulates that may later deposit on the ground
■ Areas prone to spills based on past experience at the site
■ Locations where other routine maintenance activities occur
■ Areas where smaller leaks may occur ( parkinglots )
Material Handling Procedures : From a water quality perspective , the primary principle behind
effective material handling practices is to minimize exposure to precipitation . Store the material
indoors , otherwise implement the following outdoor materials handling procedures :
■ Divert stormwater around materials storage areas .
■ Keep bulk solid materials ( raw materials , sand , gravel , topsoil , compost , concrete , packing
materials , metal products , etc ) covered and protected from stormwater .
■ When practical , store materials on impermeable surfaces .
■ Store hazardous materials according to federal , state , and local requirements .
■ Adopt procedures to reduce spills or leaks during filling or transfer of materials .
■ Substitute less toxic or nontoxic materials for toxic materials .
■ Store containers that are easily punctured or damaged away from high traffic areas .
■ Add waste - capture containers such as collection pans for lubricating fluids .
■ Store drums and containers with liquids on impermeable surfaces and provide 2dary
containment . Place drums stored outdoors on pallets to minimize contact with runoff .
Spill Response Procedures : Tailor spill response procedures to site - specific conditions and
industry - specific regulatory requirements . Follow procedures :
■ Contain and cleanup spills promptly after the spill is discovered .
■ Sweep up small quantities of pollutants to reduce exposure to runoff .
■ Place absorbents at fueling areas or areas susceptible to spills .
■ Wipe up small spills with a rag , store rags in appropriate containers , dispose of rags
properly or use a professional industrial cleaning service .
■ Contain medium - sized spills with absorbents and use berms or absorbent " snakes " as
temporary booms for the spill . Store and dispose of absorbents properly . Wet / dry
vacuums may be used , but not for volatile fluids .
■ Install drip pans below minor equipment leaks until a repair can be made .
■ For large spills , first contain the spill and plug storm inlet where the liquid may migrate
off - site , then clean up the spill .
50
■ Excavation of spill areas to removed contaminated material may be required where large
liquid spills occur on unpaved surfaces .
■ Maintain an inventory of cleanup materials onsite and strategically locate them based on
the types and quantities of chemicals present .
■ Records of spills , leaks , or overflows that result in the discharge of pollutants must be
documented and maintained .
Two approaches are used when implementing spill containment measures : 1 ) Design system to
contain the entire spill ; or 2 ) Use curbing to route spilled material to a collection basin . Both
containment berming and curbing should be sized to safely contain or convey to a collection basin
a spill from the largest storage tank , tanker truck , or other containment device in the possible
spill area . The spill containment area must have an impermeable surface ( impermeable liner ,
asphalt or concrete ) to prevent groundwater contamination . Design containment system to
enable collection and removal of spilled material through a pump or vacuum trucks , sorbent or
gelling material , etc . Material removed must be disposed of or recycled according to local , state ,
and federal standards . If the capacity of the spill containment is exceeded , supplemental
measures should be available such as a portable containment device , sorbent materials , or gelling
agents to solidify the material . Water that collects within containment areas due to rainfall or
snowmelt must be appropriately treated before release from the spill area .
Emergency 24 - Hour Site Contact ( with spill response and clean - up authority ) :
TBD :
TBD :
Office # : Cell # : Email :
Notification Procedures : Some spills may need to be reported to the State of Colorado , Water
Quality Control Division and Weld County immediately upon discovery . Releases of chemical , oil ,
petroleum product , sewage , etc . , which may enter State Waters must be reported to : State of
Colorado , 24 - hour Emergency Spill Reporting Line : 1 - 877 - 518 - 5608 .
www . cdphe . state . co . us / emp / spillsandreleased . htm ) . Weld County Public Works : 970 - 400 - 3750 .
Spill kits shall be present at all times within the construction staging area .
Incorporate any part of a Spill Prevention Control and Countermeasure ( SPCC ) plan under
section 311 of the Clean Water Act ( CWA )
The relevant sections of any referenced plans must be available on - site
Incorporate any part of the Spill Prevention Plan required by a separate CDPS permit
The relevant sections of any referenced plans must be available on - site
51
4 . 3 Good Housekeeping
Instructions : Implement good housekeeping practices during all 3 phases of construction ( initial , interim & final ) .
Good Housekeeping Practices Used : Yes Phase ( s ) : 1 , 2 , 3
1 Permanent X Temporary
Description : Good housekeeping practices are designed to maintain a clean and orderly work
environment . The most effective first steps towards preventing stormwater pollution at
construction sites simply involve using common sense to improve the site ' s basic housekeeping
methods . Poor housekeeping practices result in increased waste and potential for stormwater
contamination . A clean and orderly work site reduces the possibility of accidental spills caused
by mishandling of chemicals and equipment and should reduce safety hazards to personnel . A
well - maintained material and chemical storage area will reduce the possibility of stormwater
mixing with pollutants . Some simple procedures a site can use to promote good housekeeping
include improved operation and maintenance of machinery and processes , material storage
practices , material inventory controls , routine and regular clean - up schedules , maintaining well
organized work areas , signage , and educational program for employees and the general public .
Practice Procedures for Operation and Maintenance :
■ Maintain dry and clean floors and ground surfaces by using brooms , shovels , vacuums or
cleaning machines , rather than wet clean - up methods .
■ Regularly collect and dispose of garbage and waste material .
■ Routinely inspect equipment to ensure that it is functioning properly without leaking
and conduct preventative maintenance and needed repairs .
■ Train employees on proper clean up and spill response procedures .
■ Designate separate areas for auto parking , vehicle refueling and routine maintenance .
■ Promptly clean up leaks , drips and other spills .
■ Cover and maintain dumpsters and waste receptacles . Add additional dumpsters or
increase frequency of waste collection if overflowing conditions reoccur .
■ For outdoor painting and sanding : Conduct activities in designated areas that provide
adequate protection to prevent overspray and uncontrolled emissions . All operations
should be conducted on paved surfaces to facilitate cleanup . Use portable containment
as necessary for outside operations . Clean up and properly dispose of excess paint , paint
chips , protective coatings , grit waste , etc .
■ Maintain vegetation on facility grounds in a manner that minimizes erosion . Follow the
Landscape Maintenance and Pesticide , Herbicide and Fertilizer Usage CMs to ensure that
minimum amounts of chemicals needed for healthy vegetation are applied to minimize
transport of these materials in runoff .
Practice Procedures for Material Storage Practices :
■ Provide adequate aisle space to facilitate material transfer and access for inspection .
52
■ Store containers , drums , and bags away from direct traffic routes to reduce container
damage resulting in accidental spills .
■ Stack containers according to manufacturer ' s instructions to avoid damaging the
containers from improper weight distribution . Also store materials in accordance with
directions in Material Safety Data Sheets ( MSDSs ) .
■ Store containers on pallets or similar devices to prevent corrosion of containers that
results from containers coming in contact with moisture on the ground .
■ Store toxic or hazardous liquids within curbed areas or secondary containers .
Practice Procedures for Material Inventory Practices : An up - to - date materials inventory can
keep material costs down by preventing overstocking , track how materials are stored and
handled onsite , and identify which materials and activities pose the most risk to the environment .
Assign responsibility of hazardous material inventory to individuals trained to handle such
materials . A material inventory should include these steps :
■ Identify all chemical substances present at work site . Perform a walk - through of the site ,
review purchase orders , list all chemical substances used and obtain Material Safety Data
Sheets ( MSDS ) for all chemicals .
■ Label all containers with name and type of substance , stock number , expiration date ,
health hazards , handling suggestions , and first aid information . Find info on the MSDS .
■ Clearly identify special handling , storage , use and disposal considerations for hazardous
materials on the material inventory .
■ Institute a shelf - life program to improve material tracking and inventory to reduce the
amount of materials overstocked and ensure proper disposal of expired materials . Careful
tracking of materials ordered can result in more efficient materials use . Decisions on the
amounts of hazardous materials that are stored on site should include an evaluation - of
any emergency control systems that are in place . All storage areas for hazardous materials
should be designed to contain spills .
Practice Procedures for Training and Participation : Provide frequent and proper training in good
housekeeping techniques to reduce mishandling of chemicals or equipment . Educate by :
■ Discussing good housekeeping practices in training programs and meetings .
■ Publicizing pollution prevention concepts through posters or signs .
■ Posting bulletin boards with updated good housekeeping procedures and tips .
Place site - specific information here :
53
4 . 4 Vehicle Maintenance , Fueling and Storage
Instructions :
- Identify procedures by selecting the blue Yes / NA then type " Yes " or " NIA " .
- If applicable , CMs is required during all 3 phases of construction ( initial , interim and final ) .
Vehicle Maintenance , Fueling and Storage Used : Yes Phase ( s ) : 1 , 2 , 3
1 Permanent X Temporary
Description : Areas where vehicles are fueled , maintained , and stored / parked can be pollutant
" hot spots " that can result in hydrocarbons , trace metals , and other pollutants being transported
in precipitation runoff . Proper fueling operations , storage of automotive fluids and effective spill
cleanup procedures can help reduce contamination of stormwater runoff from vehicle
maintenance and fueling facilities . Fuel - related spills can occur due to lack of attention during
fueling or " topping off " fuel tanks . Common activities at construction sites include vehicle fluid
replacement and equipment replacement and repair . Some of the wastes generated maintaining
automobiles include solvents ( degreasers , paint thinners , etc . ) , antifreeze , brake fluid , brake pad
dust , battery acid , motor oil , fuel , and lubricating grease .
Uses : procedures are applicable to vehicle maintenance and fueling . Vehicle wash water is
considered process wastewater that will not be discharged to the storm sewer system .
Practice Procedures for Vehicle Maintenance : The most effective way to minimize wastes
generated by automotive maintenance activities is to prevent their production in the first place .
The following practices will be implemented :
■ Perform maintenance activities inside or under cover . When repairs cannot be performed
indoors , use drip pans or absorbents .
■ Keep equipment clean and free of excessive oil and grease buildup .
■ Promptly cleanup spills using dry methods and properly dispose of waste . When water is
required , use as little as possible to clean spills , leaks , and drips .
■ Use a solvent collection service to collect spent solvent used for parts cleaning .
■ When using liquids for cleaning , use a centralized station to ensure that solvents and
residues stay in one area . Locate drip pans and draining boards to direct solvents back
into a solvent sink or holding tank for reuse .
■ Store used oil for recycling in labeled tanks . Locate used oil tanks and drums away from
storm sewer , flowing streams , and preferably indoors .
■ Use non - hazardous or less hazardous alternatives when practical . For example , replace
chlorinated organic solvents with non - chlorinated ones like kerosene or mineral spirits .
■ Properly recycle or dispose of grease , oil , antifreeze , brake fluid , cleaning solutions ,
hydraulic fluid , batteries , transmission fluid , worn parts , filters , and rags .
■ Drain and crush oil filters before recycling or disposal .
■ Drain all fluids and remove batteries from salvage vehicles and equipment .
54
■ Closely monitor parked vehicles for leaks and place pans under leaks to collect the fluids
for proper disposal or recycling .
■ Install berms or other measures to contain spills and prevent work surface runoff from
entering storm sewer system .
■ Develop a spill prevention plan with measures such as spill kits , and information about
location of storm drains and how to protect them if a large spill occurs .
■ Conduct periodic employee training to reinforce proper disposal practices .
■ Promptly transfer used fluids to recycling drums or hazardous waste containers .
■ Store cracked batteries in leak - proof secondary containers .
■ Inspect outdoor storage areas regularly for drips , spills and improperly stored materials
( for example : unlabeled containers , auto parts that might contain grease or fluids , etc ) .
This is particularly important for parking areas for vehicles awaiting repair .
■ Structural CMs , such as traps , installed in vehicle hotspot areas require routine cleanout
of oil and grease . During heavy rainfall , cleanout is required more often to ensure that
pollutants are not washed through the trap . Sediment removal is also required on a
regular basis to keep the CM working efficiently .
Practice Procedures for Vehicle Fueling :
■ Fueling areas should be designed to prevent stormwater runoff and spills . Fuel - dispensing
areas should be paved with concrete or equivalent impervious surface , with an adequate
slope to prevent ponding , and separated from the rest of the site by a grade break or
berm to prevent run - on of precipitation .
■ For sites using a mobile fuel truck , establish a designated fueling area . Place temporary
" caps " over nearby catch basins or manhole covers so that if a spill occurs , it is prevented
from entering the storm sewer . 2dary containment should be used when transferring fuel
from the tank truck to the fuel tank . Cover storm drains in the vicinity . Install vapor
recovery nozzles to help control drips , and reduce air pollution .
■ Keep spill response information and spill cleanup materials onsite and readily available .
■ Employ dry cleanup methods cleaning up fuel spills . Such methods include sweeping to
remove litter and debris , and using rags and absorbents for leaks and spills .
■ Water should not be used to wash fuel spill areas . During routine cleaning , use a damp
cloth on the pumps and a damp mop on the pavement . Fuel dispensing nozzles should be
fitted with automatic shutoff except where prohibited by fire department . Post signs at
the fuel dispenser warning operators against " topping off ' vehicle fuel tanks .
■ Provide written procedures describing CMs to employees who will be fueling .
Place site - specific information here :
55
4 . 5 Street Sweeping and Cleaning
Instructions :
- Identify CMs for the construction site by selecting the blue Yes / NA then type " Yes " or " NIA " .
- If applicable , street sweeping shall be implemented for all 3 phases of construction ( initial , interim and final ) .
Street Sweeping (SS) Used : Yes Phase ( s ) : 1 , 2 , 3
1 1 Permanent X Temporary
Description : SS uses either manual or mechanical pavement cleaning practices to collect or
vacuum sediment , litter and other debris from the streets before being washed into storm sewers
by runoff . This practice can reduce pollutant loading to receiving waters , reduce clogging of storm
sewer pipes , prolong the life of infiltration CMs and reduce clogging of outlet structures in
detention ponds . Mechanical designs include : broom and conveyor belt sweeper , wet or dry
vacuum - assisted sweepers , and regenerative - air sweepers . The effectiveness depends upon
particle loadings being swept , street texture , moisture conditions , parked cars , equipment
conditions and frequency of cleaning .
Uses : SS is a technique in urban areas where sediment and litter accumulated on streets is of
concern for aesthetic , sanitary , water and air quality reasons . SS is required at constructions sites
per SWMP to reduce off - site tracking .
Procedures :
1 . SS may be performed manually ( broom and shovel ) or with a vacuum sweeper ( no kick -
broom ) . Choose the most effective approach for site conditions .
2 . SS shall be completed when there is sediment tracking from the construction site exits
into the public road or right - of - way .
3 . SS frequency depends on presence of sediment tracking . If tracking is occurring , either a
VTC shall be installed , the VTC needs maintenance , or the VTC is inadequate ; all require
SWMP updates .
4 . Off - site sediment tracking from the construction site shall be swept immediately .
5 . Conduct SS prior to precipitation events .
6 . Operate sweepers at manufacturer recommended optimal speed levels .
7 . Regularly inspect vehicles and equipment for leaks and repair promptly .
8 . Keep accurate logs of number of curb - miles swept and amount of waste collected .
9 . Dispose of SS debris and dirt at a landfill .
10 . Do not store swept material along the side of the street or near a storm drain inlet .
Place site - specific information here :
56
4 . 6 Storm Sewer Cleaning
Instructions :
- Select CMs to remove accumulated sediment , trash , and other pollutants from the storm system for the
applicable construction site wastes identified in Section 1 . 8 Potential Sources of Pollution to maintain a
clean and orderly construction site .
- Identify CMs by selecting the blue Yes / NA then type " Yes " or " NIA " . If applicable , the following practices shall
be implemented for all 3 phases of construction ( initial , interim and final ) .
Storm Sewer System Cleaning Used : Yes Phase ( s ) : 2 , 3
I I Permanent X Temporary
Description : Periodic storm sewer cleaning can help remove accumulated sediment , trash , and
other pollutants from the storm system including inlets , pipes and also construction CMs . Routine
cleaning reduces the amount of pollutants in the storm system and in receiving waters . Clogged
drains can cause overflow , leading to increase erosion . Cleaning increases dissolved oxygen ,
reduces levels of bacteria , and supports in - stream habitat . Areas with flat grades or low flows
should be given special attention because they rarely achieve high enough flows to flush
themselves . Water used in storm drain cleaning must be collected and properly disposed of ,
typically at a sanitary wastewater treatment facility . Simpler methods in localized areas can also
include manual trash collection and shoveling sediment and debris from inlets and outlets .
Frequency and prioritization of storm sewer cleaning is affected by the activity and intensity of
construction and the proper installation and maintenance for construction CMs .
Uses : Inspection of the existing storm system is recommended prior construction to document
condition . The storm sewer shall be cleaned at minimum at completion of construction .
Practice Guidelines : Inspect the storm system as part of the required stormwater inspection .
■ Technology available : manual cleaning ( shovel ) , vacuum cleaning and vacuum
combination jet cleaning . Choose the most effective approach for site conditions .
■ Staff training : train about maintenance , waste collection and disposal methods .
■ Waste disposal : Most catch basin waste is acceptable for landfills . If hazardous material
is suspected , it should be tested and disposed of accordingly .
Place site specific information here :
57
SECTION 5 : STOR WATER INSPECTIONS
5 . / Inspections
Instructions :
Identify the individual responsible for conducting inspections and describe qualifications . Certifications , such as
" Certified Inspector of Sediment and Erosion Control " ( CISEC ) , or equivalent , are recommended .
Select the frequency of inspections and procedures to inspect CMs that will occur at your site .
Identify procedures to document the repairs and maintenance of CMs as a result of the inspections .
Use the Stormwater Inspection Form in Appendix 7 . Place completed stormwater inspections in Appendix 9 .
1 . Inspection Personnel :
Identify the person ( s ) who will be responsible for conducting stormwater inspections and
describe their qualifications :
TBD :
2 . Inspection Frequency :
Inspections shall start within 7 calendar days of commencement of construction activities .
Minimum Stormwater Inspection Schedule : A thorough inspection of the site inspection shall
be performed in accordance with one of the following minimum frequencies :
• 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 .
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
58
iii . The SWMP has been amended to locate those areas to be inspected in
accordance with the reduced schedule allowed for in this paragraph .
The minimum inspection frequency required does not affect the permittee ' s responsibility to
implement and maintain effective control measures as prescribed in the SWMP . Proper
maintenance may require more frequent inspections .
3 . Inspection Procedures :
• At minimum , inspect the construction site perimeter , all disturbed area , designated
haul routes , material and / or waste storage areas that are exposed to precipitation ,
discharge location , and locations where vehicles exit the site shall be inspected for
evidence of , or the potential for , pollutants leaving the Permitted boundaries , entering
the storm sewer system , or discharging to the MS4 .
• Refer to Section 5 . 3 Inspection Sequence .
• Visually verify whether all implemented CMs are in effective operational condition
and are working as designed in their specifications to minimize pollutant discharges .
• Determine if there are new potential sources of pollutants .
• Assess the adequacy of CMs at the site to identify areas requiring new or modified
CMs to minimize pollutant discharges .
• Identify all areas of non - compliance and implement corrective action .
4 . Correcting Problems :
Take steps to minimize the discharge of pollutants until a CM is implemented and operational ,
or an inadequate CM is replaced or corrected , and returned to effective operating condition .
If it is infeasible to install or repair the CM immediately after discovering the deficiency , the
following must be documented :
( a ) Describe why it is infeasible to initiate the installation or repair immediately ; and
( b ) Provide a schedule for installing or repairing the CM and returning it to an effective
operating condition asap .
Remove and properly dispose of any unauthorized release or discharge . Clean up any
contaminated surfaces to minimize discharges of the material in subsequent storm events .
Responsible staff or company for making corrections :
TBD :
5 . Inspection Form :
Use the form ( or equivalent ) in Appendix 7 . Place completed inspections in Appendix 9 .
Document : Inspection date , name & title of inspector ; weather conditions ; phase of
construction ; estimated acreage of disturbance at the time of inspection ; location ( s ) of
discharges of sediment or other pollutants from the site ; location ( s ) of CMs needing
maintenance ; location ( s ) and identification of inadequate CMs ; location ( s ) and identification
of additional CMs needed that were not in place at the time of inspection ; description of the
minimum inspection frequency ; deviations from the minimum inspection schedule ;
certification statement for corrective action ( s ) or inspection ( if no actions ) .
59
5 . 2 Delegation of Authority
Instructions :
Delegation of Authority is optional . Attach a copy of the signed delegation of authority form in Appendix 8 .
Identify the individual ( s ) or specifically describe the position where the construction site operator has
delegated authority for the purposes of signing inspection reports , certifications , or other information .
Duly Authorized Representative ( s ) or Position ( s ) :
Company or Organization Name :
Name :
Title :
Address :
City , State , Zip Code :
Telephone Number : _
Fax / Email :
60
5 . 3 Inspection Sequence
Instructions :
When conducting stormwater inspections of your construction site it is recommended that one always follows this
recommended inspection sequence to ensure that all procedures and measures are being followed .
Place all completed inspections in Appendix 9 .
1 . Plan the stormwater inspection
■ Use the inspection form ( or equivalent ) under Appendix 7 .
■ Obtain a copy of the EC Plan ( Site Map ) with CMs locations marked .
■ Plan to walk the entire site , including discharge points from the site and any off - site
support activities .
■ Follow a consistent pattern each time to ensure you inspect all areas .
2 . Determine Inspection frequency
■ Site inspections must be conducted at least once every 7 ; or 14 calendar days .
■ If 14 - day inspections , then post - storm inspections must be conducted within 24 hours
after the end of any precipitation or snowmelt event that causes surface erosion .
■ 30 - day inspections are conducted once construction is complete , temporary stabilizations
has been installed and the site is waiting to reach final stabilization .
3 . Inspect discharge points and downstream , off - site areas
■ Inspect discharge locations to determine whether erosion and sediment control measures
are effective .
■ Inspect nearby downstream locations .
■ Walk down the street to inspect off - site areas for signs of discharges .
■ Inspect down slope existing catch basins to ensure they are free of sediment and other
pollutants and to ensure that they are adequately protected .
4 . Inspect perimeter controls and slopes
■ Inspect perimeter controls to determine if sediment should be removed .
■ Check the structural integrity of the CM . Determine if CM replacement is needed .
■ Inspect slopes and temporary stockpiles to determine if erosion controls are effective .
5 . Compare CMs in the EC Plan with the construction site conditions
■ Determine whether CMs are in place as required by the EC plan .
■ Evaluate whether CMs have been adequately installed and maintained .
■ Look for areas where CMs are needed but are missing on the field , or are not documented
on the SWMP .
6 . Inspect construction site entrances
61
■ Inspect the construction exits to determine if there is tracking of sediment from the site
onto the street .
■ Refresh or replace the rock in designated entrances and concrete washout areas .
■ Look for evidence of additional construction exits being used that are not in the SWMP or
are not stabilized .
■ Sweep the street if there is evidence of sediment accumulation .
7 . Inspect sediment controls
■ Inspect any sediment basins for sediment accumulation .
■ Remove sediment when it reduces the capacity of the basin by %3 of the design storage
volume .
8 . Inspect pollution prevention and good housekeeping practices
■ Inspect trash areas to ensure that waste is properly contained .
■ Inspect material storage and staging areas to verify that potential pollutant sources are
not exposed to stormwater runoff .
■ Verify that concrete , paint , and stucco washouts are being used properly and are correctly
sized for the volume of wash water .
■ Inspect vehicle / equipment fueling and maintenance areas for signs of stormwater
pollutant exposure .
9 . Inspect for final stabilization
■ Inspect all temporary and permanent CMs for correct application and installation with the
CM details .
■ Remove sediment from the private storm sewer system - do not jet pollutants down into
the public storm sewer system .
62
5 . 4 Common Compliance Problems
The following are problems commonly found at construction sites :
Problem # 1 - Not using phased grading or providing temporary or permanent soil stabilization
Problem # 2 - No sediment controls on - site
Problem # 3 - No sediment control for temporary stockpiles
Problem # 4 - No inlet protection
Problem # 5 - No CMs or inadequate CMs to minimize vehicle tracking onto the road
Problem # 6 - Inadequate or improper solid waste or hazardous waste management
Problem # 7 - Unpermitted dewatering and other pollutant discharge at the construction site
Problem # 8 - Poorly managed washouts ( concrete , paint , stucco )
Problem # 9 - Inadequate maintenance of CMs
Problem # 10 - Inadequate documentation
Required Non - Compliance Notifications
Report non - compliance orally within twenty - four ( 24 ) hours from the time of awareness , and mail
to the State a written report within five ( 5 ) working days after if :
• Any non - compliance issues which may endanger health or the environment regardless of
the cause of the incident ( these types of circumstances would primarily result from the
discharge of pollutants in violation of the Construction Stormwater Permit ) ;
• Any un - anticipated bypass which exceeds any effluent limitations in the Construction
Stormwater Permit
• Any upset which causes an exceedance of any effluent limitation in the Construction
Stormwater Permit
• Any daily maximum violations for any of the pollutants limited by Part I of the Construction
Stormwater 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 ( these types of circumstances would primarily result from an exceedance of a
numeric effluent ) .
63
SECTION 6 : R CORDKEEP NG
6 . / Recordkeeping
Instructions :
The following section provides a list of records that shall be kept available at your construction site for review ,
including the length of time those records shall be preserved for .
The following records shall be kept available at the construction site , or be on - site when
construction activities are occurring :
✓ An updated SWMP , reflecting current conditions and CMs .
✓ Keep record of SWMP / EC Plan changes made including the date and identification
of the changes ( * ) .
✓ Completed inspection reports , which shall be placed in Appendix 9 .
✓ Any document or plan incorporated by reference to the SWMP .
Specify where will the SWMP be located on - site :
SWMP will be located within the construction management office and / or trailer within the
site .
( * ) The SWMP must be amended when the following occurs :
1 ) A change in design , construction , operation , or maintenance of the site requiring
implementation of new or revised control measures ;
2 ) The SWMP proves ineffective in controlling pollutants in stormwater runoff in compliance
with the permit conditions ;
3 ) Control measures identified in the SWMP are no longer necessary and are removed ; and
4 ) Corrective actions are taken onsite that result in a change to the SWMP .
A notation must be included in the SWMP to identify 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 non - compliant with the permit until the SWMP revisions have been made
SWMP documentation 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 .
Records will be retained for a minimum period of at least 3 years after the CDPHE permit is
terminated .
64
SECTION 7 : FINAL STABILIZATION
7. 1 Final Stabilization Requirement
Instructions :
Final stabilization of the construction sites occurs when there is 70 % uniform vegetated cover . The vegetation MUST
be uniform so that there are no open patches of soil .
Final Stabilization means that all land disturbing activities are complete , and all disturbed areas have
either been built on , paved over or a uniform vegetative cover has been established per SWMP .
Prior to closing the State and County Stormwater Permit , all the items listed below must be
completed in order for the construction site to be considered to have final stabilization .
1 . The site has a uniform vegetative cover with a density of at least 70 % compared to
the original undisturbed site . Such cover must be capable of adequately controlling
soil erosion .
2 . If applicable , proper installation and maintenance of all approved , permanent , post -
construction stormwater quality treatment drainage facilities .
3 . Removal of all stockpiles of soil , construction material / debris , construction
equipment , etc . from the construction site .
4 . Streets , parking lots and other surrounding paved surfaces are clean and free of any
sediment or debris .
5 . Removal of sediment , debris or other pollutants within the private and adjacent
public storm drainage system .
6 . Restoration of any damaged public infrastructure caused by the construction
activities .
7 . 2 Removal of Temporary CMs
Once the site has met the final stabilization conditions , the remaining temporary CMs such
as perimeter controls , inlet protection , silt fence , etc . shall be removed and disposed of
properly .
7 . 3 Stormwater Permits Close - out
Contact the County to close the local Stormwater Permit .
Submit the CDPS Stormwater Discharge Permit Inactivation Form to the State of Colorado ,
CDPHE .
65
7 . 4 Final Stabilization Measures
Instructions :
Describe CMs for final stabilization of all disturbed areas at the site , such as : erosion control blankets , mulch and
seeding , approved landscape plan , etc . Update the EC Plan ( site map ) to indicate areas that have achieved final
stabilization .
Permanent Seeding (PS) Used : Yes Phase ( s ) : 3
X Permanent 1 1 Temporary
See Landscape Plan
Soil Stabilization Method Used : Yes / NA Phase ( s ) : 3
Permanent X Temporary
Crimped Straw ( as needed )
Hydromulch ( as needed )
Rolled Erosion Control ( as needed )
Others :
X Permanent I 1 Temporary
Asphalt and Concrete Pavement
Used : Yes Phase ( s ) : 3 X Permanent - I 1 Temporary
Describe : See Civil Plans
Xeriscape Used : Yes Phase ( s ) : 3 1 1 Permanent - 1 1 Temporary
Describe : See Landscape Plan
Landscaping Used : Yes Phase ( s ) : 3 X Permanent - 1 1 Temporary
Describe : See Landscape Plan
66
7 . 6 Long Term Stormwater Management
__ _____ __
Instructions :
Describe planned water quality drainage facilities to control pollutants in stormwater discharges that will be installed
and remain after construction operations are completed . Including , but not limited to , water quality detention basin ,
rain gardens , underground hydrodynamic separators , etc .
Describe type and location of the permanent water quality drainage facilities designed to control
pollutants in stormwater discharges that will remain after construction operations are completed :
The 10 on - site retention ponds will provide permanent flood attenuation and water quality
treatment after the construction operations are completed . All developed runoff will be routed to
these ponds where it will then infiltrate into the type A soils at the retention pond bottoms .
Recorded Access and Drainage Easement over water quality facility : Yes
Drainage easements will be recorded over the permanent retention ponds with the final plat .
Operation and Maintenance ( O & M ) Plan for the water quality facility : Yes
Operation and Maintenance guidelines are provided within the Final Stormwater Report for the
project .
67
SECTION 8 : STOR WATER VIOLATIONS
8 . 1 Stormwater Violations
Federal , State and Local jurisdictions are able to enforce their respective Stormwater Pollution
Prevention Regulations upon the Permittee or violator of these regulations . Administrative or
judicial enforcement tools vary and may involve written warning , notice of violation , stop work
order, permit revocation , surety withdrawal , civil or criminal penalties , which may require
abatement of any violation , etc .
VIOLATIONS ARE SUBJECT TO ENFORCEMENT FROM THE TIME THE VIOLATION STARTS
8 . 2 Potential Stormwater Violations
The following items are considered a violation :
1 . Conducting a permit covered activity without a local Stormwater Permit .
2 . Conducting construction activities outside the permitted boundary of the local Stormwater
Permit .
3 . Failure to prepare a SWMP.
4 . Failure to prepare an Erosion Control ( EC ) Plan , aka Site Map .
5 . Conducting a permit covered activity without County / City ' s SWMP approval .
6 . Conducting construction activity without a State CDPS Stormwater Discharge Permit .
7 . Failure to renew Stormwater Permits .
8 . Failure to renew financial surety .
9 . Deficient SWMP.
10 . Failure to update the SWMP adequately to reflect current site conditions .
11 . Failure to install , maintain or properly select Control Measures ( CM ) , aka Best Management
Practices ( BMP ) .
12 . Failure to correct findings from previous City / County Regulatory Inspections
13 . Failure to perform stormwater inspections of the permitted construction site .
14 . Failure to submit requested documentation to the City / County .
15 . Failure to adequately respond to the City / County ' s written directives .
16 . Failure to install permanent post - construction BMPs ( if applicable ) .
17 . Lack of good housekeeping practices .
18 . Pollution , contamination or degradation of stormwater quality .
19 . An illicit discharge into the City / County ' s Municipal Separate Storm Sewer System ( MS4 ) .
68
SECTION 9 : SW P CER F CAT ON
9 . / SWMP Certification Statement
Instructions :
The Permittee shall certify the SWMP by signing the certification statement below . It is recommended that all
subcontractors sign the Subcontractor Certifications /Agreements in Appendix 10 .
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 gathered and evaluated 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 .
Name : Title :
Signature : Date :
69
SWMP APPEND C S
Attach the following documentation :
Appendix 1 - Project Vicinity Map (Section 1 . 1 )
Appendix 2 - State CDPS Stormwater Construction Permit + Local Permit (Section 1 . 2)
Appendix 3 - Pre - disturbance Photos (Section 1 . 4)
Appendix 4 - Demolition Permit and State Asbestos Permit (Section 1 . 9)
Appendix 5 - Erosion and Sediment BMPs/CMs Details (Section 1 . 10)
Appendix 6 - Erosion Control Plan (EC Plan) - Site Map (Section 2 . 10)
Appendix 7 - Stormwater Inspection Form ( Template) (Section 5 . 1)
Appendix 8 - Delegation of Authority (optional) (Section 5 . 2)
Appendix 9 - Completed Stormwater Inspection Logs (Sections 5 . 3 & 5 . 5)
Appendix 10 - Subcontractor Certifications/Agreements (optional) (Section 9 . 1)
Appendix 11 - Agreement for off- site Control Measures (if applicable ) (Section 1 . 5)
Appendix 12 - Low Risk Guidance for Discharges of Potable Water (Section 1 . 8 & 1 . 9)
Appendix 13 - Erosion and Sediment Control General Notes (Section 3 . 2)
70
APPENDIX 1 : Project Vicinity Map
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71
APPENDIX 2 : CDPHE Stormwater Construction Permit + Local Stormwater Permit
72
a Q� � � COLORADO
ir
epart . ent of Public
P H Health Et Environment
Dedicated to protecting and improving the health and environment of the people of Colorado
CDPS GENERAL PERMIT COR400000
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 , as defined in this permit , to be certified under this
permit from those locations authorized to discharge from authorized locations throughout the State of Colorado to
specified surface waters of the state , in accordance with the eligibility and permit application requirements , effluent
limitations , monitoring requirements , inspection requirements , and other conditions set forth in this general 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 must be consistent with
the terms and conditions of this permit .
This permit becomes effective on , 04 / 01 / 2024 and will expire at midnight 03 / 31 / 2029 .
Issued and signed this 31 st day of January , 2024 and Effective April 1 , 2024 .
Andrew Sayers - Fay , Permits Section Manager Water Quality Control Division
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
PERMITS ACTION SUMMARY
Issued January 31 , 2024 , Effective April 1 , 2024
Page 2 of 31
Permit No . COR400000
Table of Contents
PART I 2
Ad COVERAGE UNDER THIS PERMIT 2
1 . Authorized Discharges 2
2 . Limitations on Coverage 2
3 . Permit Certification and Submittal Procedures 3
C , E F U NT L MITATIONS 7
1 . Requirements for Control Measures Used to Meet Effluent Limitations 7
2 . Discharges to an Impaired Waterbody or Outstanding Water 10
3 . General Requirements 11
E , STORMWATER MANAGEMENT PLAN REQUIREMENTS 11
1 . Stormwater Management Plan General Requirements 11
2 . Stormwater Management Plan Content 12
3 . Stormwater Management Plan Review and Revisions 14
4 . Stormwater Management Plan Availability 15
Di SITE INSPECTIONS 15
1 . Person Responsible for Conducting Inspections 15
2 . Inspection Frequency 15
3 . Inspection Frequency for Discharges to Outstanding Waters 16
4 . Reduced Inspection Frequency 16
5 . Inspection Scope 16
, DEFINITIONS 18
, MONITORING 21
G , OIL AND GAS CONSTRUCTION 21
PART II 22
A. a DUTY TO COMPLY 22
C , DUTY TO REAPPLY 22
E , N ED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE 22
D , DUTY TO MITIGATE 23
E , PROPER OPERATION AND MAINTENANCE 23
, PERMIT ACTIONS 23
a PROPERTY RIGHTS 23
Ha DUTY TO PROVID INFORMATION 23
I INSPECTION AND ENTRY 23
MONITORING AND RECORDS 24
Kd SIGNATORY REQUIREMENTS 24
La REPORTING REQUIREMENTS 25
hit BYPASS 27
N UPSET 27
REOPEN R CLAUSE 28
R , OTHER INFORMATION 28
_ SEVERABILITY 28
Rd NOTIFICATION REQUIREMENTS 28
SJ RESPONSIBILITIES 29
T , OIL AND HAZARDOUS SUBSTANCES LIABILITY 29
EMERGENCY POWERS 29
V , CONFIDENTIALITY 29
err , FEES 29
X , DURATION OF P RMIT 29
)1 SECTION 307 TOXICS 29
Page 2 of 31
Permit No . COR400000
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 .
A . COVERAGE UNDER THIS PERMIT
1 . A thorzecl Crscharges
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 :
a . Stormwater Discharges
Stormwater discharges associated with construction activity .
Stormwater discharges associated with producing earthen materials , such as soils , sand , and gravel
dedicated to providing material to a single contiguous site , or within 1/4 mile of the construction site
covered by this permit ( e . g . borrow or fill areas ) .
111 . 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 ) .
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 . 0 and if they have appropriate control
measures in accordance with Part 1 . 6 . 1 .
i . Discharges from uncontaminated springs that do not originate from an area of land disturbance .
Discharges to the ground of concrete or masonry washout water associated with the washing of
concrete or masonry tools and concrete or masonry mixer chutes , and water used to wash vehicles ,
equipment and external buildings . Discharges of concrete or masonry washout water must not leave
the site as surface runoff or reach receiving waters as defined by this permit . The addition of soaps ,
solvents and detergents is prohibited . Concrete or masonry on - site waste disposal is not authorized by
this permit except in accordance with Part I . B . 1 . a . ii ( c ) .
ill , Discharges of landscape irrigation return flow .
igirr , Discharges from diversions of state waters within the permitted site .
Emergency Fire Fighting
Discharges resulting from emergency firefighting activities during the active emergency response are
authorized by this permit .
2 . 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 , or utilize low
risk discharge guidance ( i . e . Surface Cosmetic Power Washing Operations to Land ) or clean water policy
documents ( i . e . Clean Water Policy # 14 ) as appropriate and available .
a . Discharges of non - stormwater
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 . Note : The prohibited discharges listed here are not an
exhaustive list .
i . Discharges t0 surface water from water used to wash vehicles , equipment and external building
washdown water . The addition of soaps , solvents and detergents is prohibited .
ii , Discharges from washout water for paint , form release oils , curing compounds , or other similar
Page 3 of 31
Permit No . COR400000
construction materials . See Part I . B . 1 . a . ii ( f ) .
Discharges of fuels , oils , or other pollutants used in vehicle and equipment operation and maintenance .
iv , Discharges of reclaimed water , as defined in Regulation 84 , that are approved for the use of
construction dust suppression but are not applied in accordance with Regulation 84 .
v . Discharges related to the application of potable water for dust suppression . See Part I . B . 1 . a . i ( j ) .
la , Discharges currently covered by another individual or general permit .
c . Discharges currently covered by a Water Quality Control Division ( division ) Low Risk Guidance document or
Clean Water Policy .
Discharges to outstanding waters that are long - term and / or have no or only short - term ecological or water
quality benefit or clear public interest . See Part 1 . 6 . 2 . b .
e . Chemical additions .
Any chemical addition for the treatment of stormwater associated with construction activities is not
authorized . This includes but is not limited to flocculants , polymers , and coagulants .
3 . Permit Certification and Submittal Procedures
a . Duty to Apply
The owner ( s ) / operator ( s ) must apply for coverage under this permit for discharges from the following
activities :
i , Construction activity that will disturb one acre or more ; or
Construction activity that is part of a common plan of development or sale ; or
ii i a 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 .
la , Application Requirements
To obtain authorization to discharge under this permit , applicants applying for coverage following the
effective date of the renewal permit must 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 ( permittees ) 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 .
Ma The applicant ( s ) must develop a stormwater management plan in accordance with the requirements of
Part I . C . The applicant ( s ) must also certify that the stormwater management plan is complete , or will
be complete , prior to commencement of any construction activity .
iv , In order to apply for certification under this general permit , the applicant ( s ) must submit a complete ,
accurate , and signed permit application form as provided by the division by electronic delivery at least
10 days prior to the commencement of construction activity , except those construction activities that
are in response to a public emergency related site . Public emergency related sites must 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 .
Page 4 of 31
Permit No . COR400000
vs The application in its entirety must be submitted via the division ' s online permitting system unless a
waiver is granted by the division . If a waiver is granted , the application in its entirety , including
signatures by both the owner and operator , must be submitted 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
vi , 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 .
c . 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 under this general permit ;
Request additional information necessary to evaluate the discharge ;
Delay the authorization to discharge pending further review ;
Pit. Notify the applicant that additional terms and conditions are necessary ; or
v : Deny the authorization to discharge under this general permit .
d , Alternative Permit Coverage
i , Division Required Alternative 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 ,
including if any additional terms and conditions are necessary in order to ensure that discharges
authorized by this permit will 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 . In this case , the division will notify the applicant or permittee that an individual permit
application is required .
Permittee Request for Alternative Permit Coverage :
A permittee authorized to discharge stormwater under this permit may request to be excluded from
coverage under this genera ! 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 .
e . Submittal Signature Requirements
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 :
Page 5 of 31
Permit No . COR400000
" 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 . "
fa 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 .
12 , 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 . A . 3 . a . ; Part I . A . 3 . b . ( division application requirements ) ; Part I . A . 3 . c .
( division review ) ; Part I . A . 3 . d . ( division alternate permit coverage ) ; Part I . A . 3 . f . ( oil and gas field wide
coverage ) ; Part I . A . 3 . h . ( permittee initiated actions ) ; Part I . A . 3 . i . ( residential lot coverage ) ; Part I . A . 3 . j .
( permit expiration and continuation of coverage ) ; Part II1 . 3 ( transfer of ownership or control ) ; II . W ( fees ) .
Sites covered by a qualifying local program are subject to the following requirements :
i . Local Agency Authority : his 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 .
Permit Coverage Termination : When a site under a Qualifying Local Program is finally stabilized ,
coverage under this permit is automatically terminated .
ifia 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 owner / operator
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 .
ha Permittee Initiated Permit Actions
Permittee initiated permit actions , including but not limited to modifications , contact changes , transfers ,
and terminations , must be conducted following Part III , Part I . A . 3 . e , division guidance and using
appropriate division - provided forms .
i . When a permittee modifies or terminates all or portions of permit coverage to another permittee , the
" old " permittee completing the modification or termination must provide to the division the new
permittee ' s certification number ( s ) ( ie . a land developer selling lots to home builders , etc . ) .
When a permittee transfers permit coverage to another permittee , the " new " permittee completing
the transfer must provide to the division an agreement completed and signed by the " old " permittee .
Page 6 of 31
Permit No . COR400000
ilia a When a permittee transfers permit coverage or modifies or terminates all or portions of permit
coverage to another permittee , the " old " permittee completing the transfer , modification , or
termination must provide to the division documentation of due diligence when the new permittee is
not obtaining permit coverage . Documentation of due diligence may include certified letters , multiple
attempts at email and phone contact .
i Sale of Residence to Homeowner
Residential construction sites only : The permittee may remove residential lots from permit coverage once
the lot ( s ) meets all of the following criteria :
i , The residential lot ( s ) has ( have ) been sold to the homeowner ( s ) for private residential use ;
ii , A certificate of occupancy , or equivalent , is maintained on - site or electronically and is available during
division inspections ;
ii i . The lot ( s ) is ( are ) less than one acre of disturbance ;
iv , All construction activity conducted on the lot ( s ) by the permittee is complete , including the
installation of sediment or erosion control measures that minimize sediment from exiting the lot , or
the installation of temporary stabilization on remaining disturbance where the permittee is not
responsible for final stabilization ( i . e . backyard of single family home , etc . ) ;
v . The permittee is not responsible for final stabilization of the lot ( s ) ; and
vi .. The stormwater management plan was modified to indicate the lot ( s ) is ( are ) no longer part of the
construction activity .
If the residential lot ( s ) meets the criteria listed above , then activities occurring on the lot ( s ) 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 ( s ) .
j , Permit Expiration and Continuation of Permit Coverage
Authorization to discharge under this general permit will expire at midnight on March 31 , 2029 . While
Regulation 61 . 4 requires the permittee to submit an application for continuing permit coverage 180 days
before the permit expires , the division requires that a permittee or permittees desiring continued coverage
under this genera ! permit must reapply at least 90 days in advance of this permit expiration . The division
will determine if the permittee ( s ) 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 . ( Note : the division may not
reissue a permit certification if there are outstanding past due fees per Regulation 61 . 15 ( d ) ) ; or
The issuance and effect of a termination issued by the division ; or
M . 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
'IL The division has informed the permittee that discharges previously authorized under this permit are no
longer covered under this permit .
Page 7 of 31
Permit No . COR400000
B . EFFLUENT LIMITATIONS
1 . Requirements eats 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 which , if applicable , includes run - on . Control measures used to meet effluent
limitations must be installed prior to commencement of construction activities and prior to each phase of
construction that introduces new potential pollutant sources . 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 .
a . 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
Structural and non - structural 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 , filter bags , subsurface drains , pipe slope drains , inlet protection , outlet protection , gabions ,
sediment basins , temporary vegetation , permanent vegetation , mulching , geotextiles , sod
stabilization , and slope roughening , maintaining existing vegetation , preserving native topsoil ,
protection of trees , preservation of mature vegetation , phasing of site development , preserving natural
topography , minimizing soil compaction in areas of vegetative final stabilization , and minimizing site
access .
Specific control measures must meet the requirements listed below .
( a ) Vehicle tracking controls must be implemented to minimize vehicle tracking of sediment from
disturbed areas . Vehicle tracking controls must include a structural control measure ( e . g . tracking
pad or wash rack ) and may include a non - structural control measure ( e . g . sweeping or restricting
vehicle traffic to paved areas ) .
( b ) Stormwater runoff from all disturbed areas and soil storage areas must utilize or flow to one or
more control measures to minimize erosion or sediment in the discharge . The control measure ( s )
must be selected , designed , installed and adequately sized in accordance with good engineering ,
hydrologic and pollution control practices for the intended application . 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 ( e . g . sheet or concentrated flow ) .
( c ) Selection of control measures should prioritize the use of control measures that minimize the
potential for erosion ( i . e . covering materials ) . Selection should also prioritize phasing construction
activities to minimize the amount of soil disturbance at any point in time throughout the duration
of construction .
( d ) Outlets that withdraw water from or near the surface must be installed when discharging from
basins and impoundments , unless infeasible .
( e ) Maintain pre - existing vegetation for areas within 50 horizontal feet of receiving waters as defined
by this permit , unless infeasible . In addition to maintaining 50 horizontal feet of pre - existing
vegetation upgradient of a receiving water ( unless infeasible ) , the permittee must install control
measures upgradient of the vegetative buffer that meets the requirements of this section , Part
I . B . 1 . a . i .
( f ) Soil compaction must be minimized for areas where infiltration control measures are implemented
or where final stabilization will be achieved through vegetative cover . If compaction does occur in
areas where final stabilization will be achieved through vegetative cover , then decompaction of
the soil must be completed prior to planting .
Page 8 of 31
Permit No . COR400000
( g ) Unless infeasible , topsoil must be preserved for those areas of a site that will utilize vegetative
final stabilization . Preserved topsoil can be left in place or stockpiled .
( h ) Minimize the amount of soil exposed during construction activity , including the disturbance of
steep slopes .
( I ) Diversion control measures used for clean water diversions must minimize soil transport and erosion
within the entire diversion , minimize erosion during discharge , and minimize run - on into the
diversion . The permittee must minimize the discharge of pollutants throughout the installation ,
implementation and removal of the diversion . Diversions must meet one or more of the following
conditions :
( 1 ) Lined or piped structures that result in no erosion for anticipated flow conditions .
( 2 ) Diversion channels , berms , and coffer dams must be lined or composed of a material that
minimizes potential for soil loss in the entire wetted perimeter during anticipated flow
conditions ( e . g . vegetated swale , non - erosive soil substrate ) . The entire length of the diversion
channel must be designed such that the maximum flow velocity for the type of material ( s )
exposed to the anticipated flows ensures the calculated maximum shear stress of flows in the
channel is not expected to result in physical damage to the channel or liner nor result in
discharge of pollutants . Additionally , the conditions relied on to minimize soil loss must be
maintained for the projected life of the diversion ( e . g . use of a vegetated swale must be
limited to a period of time that ensures vegetative growth , minimizes erosion and maintains
stable conditions ) .
( 3 ) An alternative diversion criteria , approved by the division prior to implementation . The
diversion method must be designed to minimize the discharge of pollutants and to prevent the
potential for pollution or degradation to state waters as a result of the diverted flow through
the diversion structure . In addition , the alternative diversion method must minimize the
discharge of pollutants throughout the installation , implementation and removal of the
diversion .
( j ) Minimize dust . On areas of exposed soil , minimize dust through the appropriate application of
water or other dust suppression techniques . Water application must be conducted in a manner to
prevent discharge offsite unless authorized by a separate CDPS or NPDES permit .
( k ) Control stormwater discharges , including both peak flowrates and total stormwater volume , to
minimize channel and streambank erosion and scour in the immediate vicinity of discharge points .
ii , Practices for Other Common Pollutants
( a ) Bulk storage ( individual containers of 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 ) Spills and leaks must be minimized . Upon identification , spills and leaks must immediately be
contained and mitigated per the spill prevention and response plan , as applicable ( i . e . oil , grease ,
fluids associated with vehicle and equipment maintenance , toxic chemicals , hazardous substances ,
etc . ) .
( c ) Control measures designed for concrete washout waste , masonry operations , stucco waste ,
vehicle / equipment washing , and external building washdown 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 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 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 or masonry washout location ( including vehicle / equipment and
external building washdown water , if applicable ) must 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
Page 9 of 31
Permit No . COR400000
concrete washout waste , but does not authorize on - site waste disposal per Part I . 6 . 3 . d .
( d ) In the event that water remains onsite and contains pollutants either from firefighting activities or
picked up from the site ( i . e . in a gutter , sediment basin , etc . ) after active emergency response is
complete , the permittee must ensure the remaining water containing pollutants is properly
removed and disposed of in order to minimize pollutants from discharging from the site , unless
infeasible .
( e ) Minimize the exposure of fertilizers , pesticides , and herbicides to stormwater during storage . Store
and apply fertilizers , pesticides , and herbicides per manufacturer ' s directions .
( f ) For washing applicators and containers used for paint , form release oils , curing compounds , or
o ther similar construction materials , the wash water must be directed into a leak - proof container
o r leak - proof and lined pit designed so no discharges to groundwater occur or overflows occur due
to inadequate sizing or precipitation . Liquid and hardened wastes must be appropriately disposed .
Ma 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 hydromulch . The permittee may exceed the 14 - day schedule when
e ither 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 stormwater management plan
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 . Minimum inspection frequency and scope , as directed in Part I . D . , must be followed
for temporarily stabilized areas .
( b ) Final stabilization must be implemented for all construction sites covered under this permit . inal
stabilization is reached when the following are complete :
( 1 ) All construction activities are complete .
( 2 ) Permanent stabilization methods are complete . Permanent stabilization methods include , but
are not limited to , permanent pavement or concrete , hardscape , xeriscape , stabilized driving
surfaces and storage areas , vegetative cover , or equivalent permanent alternative stabilization
methods . The division may approve alternative final stabilization criteria for specific
operations . Vegetative cover must include the following criteria :
a . Evenly distributed perennial vegetation , which may include trees and shrubs ;
lai Vegetation coverage , at a minimum , equal to 70 percent of what would have been provided
by native vegetation in a local , undisturbed area or adequate reference site ; and
c . If applicable , adherence to stabilization requirements does not negate the permittee ' s
requirement to comply with the local jurisdiction ' s plant species requirements .
( c ) Final stabilization must be designed and installed as a permanent feature . All control measures
must be removed from the construction site , except when the control measure specifications allow
the control measure to be left in place ( i . e . bio - degradable control measures , permanent
sedimentation basin , etc ) . 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 to provide adequate protection to minimize erosion ( e . g . crimped
straw , hydro mulch or rolled erosion control products ) ;
( 4 ) Appropriate sediment control measures as needed until final stabilization is achieved ;
Page 10 of 31
Permit No . COR400000
( 5 ) Permanent pavement , hardscape , xeriscape , stabilized driving surfaces ;
( 6 ) Conversion of construction site back to prior cropland use . The permittee is not required to
plant the crop prior to termination ; and
( 7 ) Other alternative stabilization practices as applicable .
Routine 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 routinely
maintained in accordance with good engineering , hydrologic and pollution control practices . Observations
leading to the required routine 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 . Control measures requiring routine maintenance are not subject to the requirements
in Part I . B . 1 . c below .
c . Corrective Actions
The permittee must assess the adequacy of control measures at the construction 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 , the following corrective action
requirements apply . The permittee is not in compliance 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 ILL , the permittee must also meet the requirements of
that section .
L. The permittee must take all necessary steps to minimize or prevent the discharge of pollutants from
the permitted area and manage any stormwater run - on onto the site 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 the control measure
immediately after discovering the deficiency , the following must be documented in the stormwater
management plan in Part I . D . 5 . c 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 .
If applicable , the permittee must remove and properly dispose of any unauthorized release or
discharge within and from the permitted area ( e . g . , discharge of non - stormwater , untreated
stormwater containing pollutants such as sediment , spill , or leak not authorized by this permit . ) The
permittee must clean up any contaminated surfaces , if feasible , to minimize discharges of the material
in subsequent storm events , including water remaining from the response that contains pollutants after
active emergency firefighting response is complete . Permittees are prohibited from hosing down an
area to clean surface spills or leaks unless the wash water is adequately captured to not discharge off
the site or to land and the captured water is properly disposed . In addition , the permittee must
mitigate any accumulation of sediment outside of the site boundaries .
Discharges . to an Imeaired Waterbody or Outstared ng Water
a . Total Maximum Daily Load ( TMDL )
If the discharge from the site of permit coverage flows to or could reasonably be expected to flow to any
water body for which a TMDL has been approved , and stormwater discharges associated with construction
activity were assigned a pollutant - specific Wasteload Allocation ( WLA ) under the TMDL , the division may :
L. Ensure the WLA is implemented properly through alternative local requirements , such as by a municipal
stormwater permit ; or
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Permit No . COR400000
Notify the permittee of the WLA and amend the permittee ' s certification to add specific effluent
limits , other requirements , and compliance schedules , as necessary and appropriate . The permittee
may be required to do the following :
( a ) Under the permittee ' s stormwater management plan , 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 .
111 Discharge monitoring may also be required . The permittee may maintain coverage under the general
permit provided they comply with the applicable requirements outlined above .
b .. Outstanding Waters
i . Discharges to outstanding waters must be short - term and have a long - term ecological or water quality
benefit or clear public interest . A state outstanding waters map can be found here .
ii , Sites that discharge to outstanding waters are required to have an increased inspection frequency
found in Part I . D . 3 .
c . The division may require individual or alternate general permit coverage per Part I . A . 3 . d . i .
3 . General Req u - re men is
a . Discharges authorized by this permit must 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 .
1) . The division may require sampling and testing , on a case - by - case basis , in the event that there is reason to
suspect that the stormwater management plan 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 .
c . 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 .
d . The division may include additional requirements as specified in the applicable watershed protection
Control Regulations 71 - 74 .
e . All construction site wastes must be properly managed to prevent potential pollution of state waters . This
permit does not authorize on - site waste disposal .
f , 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 ILL of the permit ) .
E . STORMWATER MANAGEMENT PLAN REQUIREMENTS
1 . Stormy ate r Management P an General Requirements
a . The permittee must develop , implement , and maintain a stormwater management plan for each
construction site listed under Part I . A . 3 . a , including , but not limited to , construction activity that will
disturb one acre or more and / or are part of a common plan of development or sale covered by this permit .
L. The plan must be prepared in accordance with good engineering , hydrologic and pollution control
practices .
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Permit No . COR400000
ii , For public emergency related sites , the plan must be created no later than 14 days after the
commencement of construction activities .
la , The permittee must implement the provisions of the plan as written and updated , from commencement of
construction activity until final stabilization is complete . The division may review the plan .
c . A copy of the plan must be retained onsite or be onsite when construction activities are occurring at the
site unless the permittee specifies another location and obtains written approval from the division . The
plan and inspection reports may be prepared , signed , and kept electronically , rather than in paper form , if
the records are :
i , In a format that can be read in a similar manner as a paper record ; and
Immediately accessible to the inspector during an inspection to the same extent as a paper copy stored
at the site would be .
Z . Stormwater Management Nan ! Content
The stormwater management plan , at a minimum , must include the following elements .
a . Qualified Stormwater Manager . The plan must list individual ( s ) by title and name who are designated as
responsible for implementing the stormwater management plan in its entirety and meet the definition of a
Qualified Stormwater Manager . This role may be filled by more than one individual .
b , Other Permits . The plan must list the applicable CDPS permits and low - risk discharge guidance documents
associated with the permitted site ( including the COR400000 general permit and the certification
associated with the site ) and the activities occurring on the permitted site ( e . g . a CDPS Dewatering
Permit ) . The plan must also list applicable US Army Corps of Engineers Section 404 permits . A copy of this
general permit , applicable permit certification , and any applicable low - risk discharge guidance documents
must be included in the stormwater management plan for each construction site .
c . Site Description . The plan must include a site description which includes , at a minimum , the following :
i , The nature of the construction activity at the site , including if it is a public emergency related site ;
ii , 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 . ) ;
Estimates of the total acreage of the site , and the acreage expected to be disturbed by clearing ,
excavation , grading , or any other construction activities ;
iv , A summary of any existing data and sources used in the development of the construction site plans or
stormwater management plan that describe the soil types found in the permitted area and the
erodibility of the identified soil types ;
v. A description of the percent cover from native vegetation on the site if the site is undisturbed , or the
percent cover from native vegetation in a similar , local undisturbed area or adequate reference area if
the site is disturbed . Include the source or methodology for determining the percentage . If a percent
cover is not appropriate for the site location ( i . e . arid ) , describe the technique and justification for the
identified cover of native vegetation ;
vi , A description of any allowable non - stormwater discharges at the site , including those being discharged
under a separate CDPS permit , discharges under Part I . A . 1 . b , or a division low risk discharge guidance ,
and applicable control measures installed ;
1 , A description of the general flow direction and where or how the discharge leaves the site , including a
description of the immediate conveyance or area receiving the discharge and the receiving water ( s ) of
the discharge , if different than the immediate conveyance or area . If the stormwater discharge is to a
municipal separate storm sewer system , include the name of the entity owning that system , the
location ( s ) of the stormwater discharge , and the receiving water ( s ) ;
description of all stream crossings located within the construction site boundary , if applicable ;
ix, A description of the alternate temporary stabilization schedule , if applicable ( Part 1 . B . 1 . a . iii ( a ) ; and
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Permit No . COR400000
x. A description of the alternative diversion criteria as approved by the division , if applicable
( Part 1 . 6 . 1 . a . i ( i ) ( 3 ) ) .
xi , A description of any effluent limitations that the permittees determines are infeasible and why they
are infeasible , if applicable ( Part I . B . 1 . a . i . ( d , e , and g ) and I . B . 1 . a . ii . ( d ) .
di Site Map . The plan must include a site map which includes , at a minimum , the following :
i , Construction site boundaries ;
Flow arrows that depict stormwater flow directions on and off - site ;
111 , All areas of ground disturbance including areas of borrow and fill ;
iv „ Areas used for storage of soil ;
v. Locations of all waste accumulation areas , including areas for liquid , concrete , masonry , and asphalt ;
vi „ Locations of dedicated asphalt , concrete batch plants and masonry mixing stations ;
Locations of other potential sources of pollution not listed in iii . through vi .
Locations of all structural control measures ;
ix, Locations of all non - structural control measures ( e . g . temporary stabilization ) ;
x„ Locations and names , as listed in Part I . C . 2 . c . vii , of springs , streams , wetlands , diversions and other
state waters within or bordering the site , 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 ( e ) ( e . g . MS4 to unnamed tributary to the South Platte River ) ;
xi .. Locations of all stream crossings located within the construction site boundary ;
xii , Locations where alternative temporary stabilization schedules apply ; and
e . Potential Sources of Pollution . The plan 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 .
i , The plan must include the following pollutant sources as these pollutants relate to every construction
site :
( a ) Disturbed and stored soils ;
( b ) Vehicle tracking of sediments ;
( c ) On - site waste management practices ( waste piles , liquid wastes , dumpsters ) ;
The plan may include , but is not limited to , the following pollutant sources :
( a ) Management of contaminated soils ( contaminated soils may also occur from onsite spills or leaks ) ,
if known to be present , or if contaminated soils are found during construction ;
( b ) Loading and unloading operations ;
( c ) Outdoor storage activities ( erodible building materials , fertilizers , chemicals , etc . ) ;
( d ) Vehicle and equipment maintenance and fueling ;
( e ) Significant dust or particulate generating processes ( e . g . , saw cutting material , including dust ) ;
( f ) Routine maintenance activities involving fertilizers , pesticides , herbicides , detergents , fuels ,
solvents , oils , etc . ;
( g ) Concrete / masonry truck / equipment washing , including washing of the concrete truck chute and
associated fixtures and equipment ;
( h ) Dedicated asphalt , concrete batch plants and masonry mixing stations ;
( i ) Non - industrial waste sources such as worker trash and portable toilets ; and
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Permit No . COR400000
( j ) Reclaimed water approved for use in construction dust suppression .
fa Materials Handling . The plan must describe handling procedures of 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 .
Spill Prevention and Response Plan . The plan 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 stormwater management
plan consistent with Part I . C . 4 .
ha Implementation of Control Measures . The plan must include design specifications that contain information
on the implementation of all the control measures in use on the site 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 .
L. The plan 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 plan 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 .
j , Temporary Stabilization , Final Stabilization and Long Term Stormwater Management .
L. The plan must document the constraints necessitating an alternative temporary stabilization schedule ,
as referenced in Part I . B . 1 . a . iii ( a ) , provide the alternate stabilization schedule , and identify all
locations where the alternative schedule is applicable on the site map .
ii , The plan must document all residential lots that utilize the Sale of Residence to Homeowner , as
referenced in Part I . A . 3 . 1 , the lots that received temporary stabilization and meet all the requirements
u nder Part I . A . 3 . i , and identify all the lot locations where Part I . A . 3 . i is applicable on the site map .
111 The plan must describe or locate where all final stabilization methods are used and what methods are
u sed to achieve final stabilization of all disturbed areas at the site ( e . g . pavement , vegetative cover ,
e tc ) , as listed in Part 1 . 6 . 1 . a . iii ( b ) .
iv , The plan must describe how the permittee will establish final stabilization through vegetative cover or
alternative stabilization method , as referenced in Part 1 . 6 . 1 . a . iii ( c ) , and describe and locate any
temporary control measures in place during the process of final stabilization ( e . g . seed mix , soil
amendments , final stabilization methods , return to cropland , etc . ) .
v . The plan must describe and locate any planned permanent control measures 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 .
Ira Inspection Reports . The plan must include documented inspection reports in accordance with Part I . D . 5 . c .
3 . Stor warter Management Plan Review and Revis . ons
Permittees must keep the stormwater management plan current and maintain a record of changes made that
includes the date and identification of the changes . The plan must be amended when the following occurs :
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Permit No . COR400000
a . A change in design , construction , operation , or maintenance of the site requiring implementation of new or
revised control measures ;
1) . The plan proves ineffective in controlling pollutants in stormwater runoff in compliance with the permit
conditions ;
c . Control measures identified in the plan are no longer necessary and are removed ;
ri ., Corrective actions are taken onsite that result in a change to the plan ; and
e . The site or areas of the site qualifying for reduced frequency inspections under Part I . D . 4 .
For stormwater management plan 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
plan 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 methods for notation may
include notations on site maps , a log of changes , redline changes in the , or other measures . The permittee
must ensure the site changes are reflected in the plan . The permittee is noncompliant with the permit
until the plan revisions have been made .
4 . Stor- mwater Management Plans Availability
A copy of the stormwater management plan 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 plan 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
plan is complete and compliant with all terms and conditions of the permit .
All stormwater management plans 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 stormwater management plan as confidential in accordance with 40 CFR Part 2 .
D . 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 stormwater management plan , Part I . C . 2 . a . vi , as
proper maintenance of control measures may require more frequent inspections . Site inspections must start within
7 calendar days of the commencement of construction activities on site .
1 . Persons 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 meets the definition of a Qualified Stormwater Manager . The inspector may be different than the
individual ( s ) listed in Part I . C . 2 . a .
Z . Inspection Freq ency
Permittees must conduct site inspections in accordance with one of the following minimum frequencies , unless
the site meets the requirements of Part I . D . 3 . All inspections must be recorded per Part . D . 5 . c .
a . At least one inspection every 7 calendar days ; or
b , 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 .
c . When site conditions make the schedule required in this section impractical , the permittee may petition
the division t0 grant an alternate inspection schedule . The alternative inspection schedule must not be
implemented prior to written approval by the division and incorporation into the stormwater management
plan .
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Permit No . COR400000
3 . 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 . In order to determine if
the immediate receiving water is to an Outstanding Water , the permittee can use this map of Outstanding
Waters .
4 . Deduced inspection Fr - ewency
The permittee may perform site inspections at the following reduced frequencies when one of the following
conditions exists :
a . Post - Storm Inspections at Temporarily Idle Sites
For permittees choosing an inspection frequency pursuant to Part I . D . 2 . b and if no construction activities
will occur following a storm event , post - storm event inspections must be conducted prior to re -
commencing construction activities , and no later than 72 hours after the end of any precipitation or
snowmelt event that causes surface erosion . If the post - storm event inspection qualifies under this section ,
the inspection delay must be documented in the inspection record per Part I . D . S . c . Routine inspections
must still be conducted at least every 14 calendar days .
la , Inspections at Sites Awaiting Final Stabilization
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 construction site and control
measures 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 Part 1 . B . 1 . a . iii ( b ) Ft ( c ) and with the
stormwater management plan , have been completed , with the exception of the application of sod or
seed that has not occurred due to seasonal conditions or the necessity for additional seed application
to augment previous efforts ; and
Hi , The stormwater management plan has been amended to locate those areas to be inspected in
accordance with the reduced schedule allowed for in this paragraph .
c . Winter Conditions Inspections Exclusion
Typically , this exclusion applies to elevations or locations where snow melt does not occur in the winter
months . Inspections are not required for sites that meet all of the following conditions :
i Construction activities are temporarily halted for the winter season ( e . g . December - February due to
site being inaccessible ) ;
Snow cover exists over the entire site for an extended period ( i . e . high - elevation winter season ) ; and
Hi , 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 I . C . 3 and Part I . D . S . c :
( a ) Dates when snow cover existed ;
( b ) Date when construction activities ceased ; and
( c ) Date melting conditions began .
5 . Inspectio n Sco site
a . Areas to Be Inspected
When conducting a site inspection the following areas , if applicable , must be inspected for evidence of , or
Page 17 of 31
Permit No . COR400000
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 , including areas that are temporarily stabilized ;
Ma Locations of installed control measures ;
iv , Designated haul routes ;
vs Material and waste storage areas exposed to precipitation ;
vi . Locations of pumped stormwater ;
Locations where stormwater has the potential to discharge offsite , including visible erosion and
sedimentation ; and
lyriii . Locations where vehicles exit the site .
tad Inspection Requirements
Inspections must assess the following components :
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 .
( a ) For pumped stormwater , assessment may include sediment plume , suspended solids , unusual color ,
decreased clarity , presence of odor or foam , etc .
ii , Determine if there are new potential sources of pollutants .
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 ( s ) in accordance with Part . B . 1 . c .
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 . All inspection
reports must be signed and dated in accordance with Part I . D . 5 . c . xiii and xiv below . Inspection records
must be retained in accordance with Part II . J . At a minimum , the inspection report must include :
i . The inspection date ;
Name ( s ) and title ( s ) of personnel conducting the inspection ;
Ma 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 ) and identification of control measures requiring routine maintenance ;
Location ( s ) and identification of discharges of sediment or other pollutants from the site ;
viii . Locations ) and identification of inadequate control measures ;
ix, Location ( s ) and identification of additional control measures needed that were not in place at the time
of inspection ;
xs Description of corrective action ( s ) for items vii , viii , ix , above , dates corrective action ( s ) were
completed , including requisite changes to the stormwater management plan , as necessary ;
xi , Description of the minimum inspection frequency ( either in accordance with Part I . D . 2 , Part I . D . 3 or
Part I . D . 4 . ) utilized when conducting each inspection ;
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Permit No . COR400000
xii , Deviations from the minimum inspection schedule as required in Part I . D . 2 . This would include
documentation of division approval for an alternate inspection schedule outlined in Part I . D . 2 . c ;
xiii , After adequate corrective action ( s ) have been taken , or where a report does not identify any incidents
requiring corrective action , the report must contain the following statement and provide the date of
the statement :
" I verify that , to the best of my knowledge and belief , that if any corrective action items were
identified during the inspection , those corrective actions are complete , and the site is currently in
compliance with the permit . " ; and
Inspection reports must be signed by the individual ( s ) designated as a Qualified Stormwater Manager,
as defined in Part I . E .
E . 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
1/4 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 ) Construction Site - The location where construction activity is occurring and associated discharges are
covered by this permit , including offsite locations for storage , staging , etc . For use in this permit , the terms
construction site , site , and facility are used interchangeably .
( 5 ) 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 .
( 6 ) 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 preventative maintenance to prevent a
breach of the control measure in subsequent storms .
( 7 ) Dedicated Asphalt , Concrete Batch Plants and Masonry Mixing Stations - Are batch plants or mixing stations
located on , or within 1/4 mile of , a construction site and that provide materials only to that specific
construction site .
( 8 ) Disturbed area - Any ground disturbance prior to final stabilization .
( 9 ) Diversion - Discharges of state waters that are temporarily routed through channels or structures ( e . g . in -
stream , uncontaminated springs , non - pumped groundwater , temporary rerouting of surface waters , fords ) .
For purposes of this permit , these diversions can also be referred to as clean water diversions .
Page 19 of 31
Permit No . COR400000
( 10 ) Final Stabilization - The condition reached when construction activities at the site have been completed ,
permanent stabilization methods are complete , and temporary control measures are removed . Areas being
stabilized with a vegetative cover must have evenly distributed perennial vegetation . The vegetation
coverage must be , at a minimum , equal to 70 percent of what would have been provided by native
vegetation in a local , undisturbed area or adequate reference site .
( 11 ) 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 .
( 12 ) 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 .
( 13 ) Infeasible - Not technologically possible , or not economically practicable and achievable in light of best
industry practices .
( 14 ) 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 .
( 15 ) 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 ) .
( 16 ) 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 ;
b . Designed or used for collecting or conveying stormwater ;
c . Are not a combined sewer ; and
d . Are not part of a Publicly Owned Treatment Works ( POTW ) . See 5 CCR 1002 - 61 . 2 ( 62 ) .
( 17 ) Municipal Stormwater Management Program - A stormwater program operated by a municipality , typically to
meet the requirements of the municipality ' s MS4 discharge certification .
( 18 ) Native Vegetation - Plant species that are naturally occurring for the particular area ( or region ) and have
adapted to and are well suited for the soil , temperature , nutrients , and precipitation of the particular area
( region ) .
( 19 ) 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 ( i . e . the general contractor ) .
( 20 ) Outstanding Waters - Waters designated as outstanding waters pursuant to Regulation 31 , Section 31 . 8 ( 2 ) ( a ) .
The highest level of water quality protection applies to certain waters that constitute an outstanding state
or national resource .
( 21 ) 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 that may have ownership of , a long term lease of , or
easements on the property on which the construction activity is occurring ( e . g . the developer ) .
Hello