CITY OF ARVADA
SITE DEVELOPMENT PERMIT (SDP)
STORMWATER MANAGEMENT PLAN TEMPLATE
Revised December 31, 2015
This template is provided for use when developing a Stormwater Management Plan (SWMP) for
construction activities in the City of Arvada. The use of this template is not required.
Content in italics directs the user as to what should be added in each section.
During construction, exposed soil is vulnerable to erosion by water and wind. Eroded soil
impacts water resources by affecting water quality and causing the siltation of aquatic habitat
for fish and other desirable species. Eroded soil also necessitates repair of sewers and ditches,
and the dredging of lakes. In addition, clearing and grading during construction causes the loss
of native vegetation that provides terrestrial and aquatic habitat. Managing erosion and
sediment transport during construction and establishing good vegetative cover or other stable
cover following construction is important for protection of water resources from excessive
sediment and is part of providing a healthy living environment for citizens of Arvada. In
addition to erosion and sediment, the SWMP also addresses other potential pollutants
associated with construction activities (fuel, materials, waste locations, etc.).
This template has been developed to provide guidance on preparing a Stormwater Management
Plan (SWMP). Review or use of this template shall not imply that it has been reviewed for
compliance with the requirements set forth by the State of Colorado Department of Public
Health and Environment (CDPHE) General Permit for Stormwater Discharges Associated with
Construction Activities (General Stormwater Permit). In all cases the permittee must modify
this template to provide site-specific information. Users of the template are advised to compare
their SWMPs, whether prepared from this template or not, with the requirements of the CDPHE
General Stormwater Permit and City of Arvada requirements.
INTENT OF THE STORMWATER MANAGEMENT PLAN (SWMP)
The intent of the Stormwater Management Plan (SWMP) is to:
Sample language: minimize water pollution by providing guidance on how to protect
storm drain inlets and waterways during construction activities from grading, utility
construction, millings/grinding operations, concrete saw water, waste materials such as
concrete washout, and any disturbances to dirt/earth. Objectives include protecting as
much existing vegetation as feasible, slowing down runoff, preventing or minimizing
erosion from construction activities, providing incremental phased seeding and
mulching, avoiding or minimizing disturbances to sensitive areas, i mpl em ent at i on of
s eedi ng and stabilization measures, and scheduling SWMP implementation relative
to construction activities.
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CONTACT INFORMATION AND RESPONSIBLE PARTIES
List the operators, project managers, stormwater manager, and person or organization that
implementing the SWMP. Include name, company, address, telephone number, and fax or e-mail
address.
PROJECT SITE DESCRIPTION
1.
Describe the construction activity, including:
a) The nature of the construction activity at the site.
b) The proposed sequence for major activities. Sequencing of major activities including
phased BMP implementation, clearing, grading, utility construction, road
construction, stormwater infrastructure construction, vertical construction, and
temporary and final stabilization.
c) Estimates of the total area of the site, and the areas and locations expected to be
disturbed by clearing, excavation, grading, or other construction activities.
d) A summary of any existing data used in the development of the site construction plans
or SWMP that describe the soils or existing potential for soil erosion.
e) A description of the existing vegetation at the site and an estimate of the percent
vegetative ground cover.
f)
The location and description of all potential pollution sources, including ground
surface disturbing activities (see Part I.A.2.b), vehicle fueling, storage of fertilizers or
chemicals, etc.
g) The location and description of any anticipated allowable sources of non-stormwater
discharge at the site, (e.g., uncontaminated springs, landscape irrigation return flow,
construction dewatering, and concrete washout).
h) The name of the receiving water(s) and the size, type and location of any outfall(s). If
the stormwater discharge is to a municipal separate storm sewer system, provide the
name of that system, the location of the storm sewer discharge, and the ultimate
receiving water(s).
2.
This construction project is within the City of Arvada, which has a Phase II Municipal
Separate Storm Sewer System (MS4) Permit from the State of Colorado.
3.
Stormwater from this site discharges to:
Include the size, type and location of outfalls that discharge into the storm sewer system
and the ultimate receiving water or stream.
Receiving Water Name: ___________________________
Distance from project the receiving water is: ___________
Wetland impacts? Yes No
Stream impacts?
Yes
No
If there are special conditions related to wetland or stream impacts from Section 404 or
other permits that are related to stormwater management, it is recommended that
applicable permits be appended to the SWMP and any special control measures included
in the SWMP narrative and plans.
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4.
The existing soil onsite is:
Describe soil, soil erosion potential or the quality of any discharge from the site as listed
in the applicable Soil Survey, published by the Soil Conservation Service, or by accessing
their website at http://websoilsurvey.NRCS.USDA.gov.
5.
The total acres of disturbance, including all clearing, grading, excavation activities, areas
receiving overburden (e.g. stockpiles), demolition areas and areas with heavy
equipment/vehicle traffic and storage that will disturb existing vegetative cover is
acres.
Total area of construction site:
acres
Total area of disturbance:
acres
Total area of p r o p o s e d impervious:
acres
Total area of proposed landscaping:
acres
6.
Provide a description of the existing vegetation on the site, the percent cover prior to
construction, and where the information was obtained (for example, vegetation survey or
visual observations, including date)
7.
Provide a description and location of other non-stormwater discharges, such as:

Springs and landscape irrigation return flow.

Emergency firefighting activities.

Discharges to the ground of concrete washout water from washing of tools and
concrete mixer chutes may be authorized by this permit, provided that:
- The source is identified in the SWMP;
- BMPs are included in the SWMP in accordance with CDPS General Permit
COR-030000, and,
- These discharges do not leave the site as surface runoff or to surface waters.

Discharges to the ground of water from construction dewatering activities may be
authorized by this permit, provided that:
- The source is groundwater and/or groundwater combined with stormwater that
does not contain pollutants in concentrations exceeding the State groundwater
standards in Regulations 5 CCR 1002-41 and 42;
- The source is identified in the SWMP;
- BMPs are included in the SWMP; and
- These discharges do not leave the site as surface runoff or to surface waters.
Describe how non-stormwater discharges will be handled/treated.
ADDITIONAL PERMITS
Additional State or Federal permits may be required for a construction project depending on
the circumstances.
1. When a wet watercourse must be crossed regularly during construction, and a
temporary stream crossing is needed, approval may be required by the U.S. Army
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Corps of Engineers. Under State requirements, documentation must be available
showing that the analysis was conducted on whether a permit was required.
2. Anytime water needs to be pumped from a construction site due to ground water, or
groundwater comingled surface or stormwater water, a Construction Dewatering
Discharge Permit must be obtained from the State of Colorado, whether the
discharge is pumped to a public or private conveyance or regardless on the size of
the site or the discharge.
THE STORMWATER MANAGEMENT PLAN
The SWMP will be implemented in three general phases: 1) initial construction activity, 2)
during construction, and 3) final stabilization.
Site Map Components
The SWMP Site Map must include legible site maps, showing the entire site identifying:
a) Construction site boundaries;
b) All areas of ground surface disturbance;
c) Areas of cut and fill and borrow locations;
d) Areas used for storage of building materials, equipment, soil, or waste;
e) Locations of dedicated asphalt or concrete batch plants;
f) Locations of all structural BMPs;
g) Locations of non-structural BMPs as applicable; and
h) Locations of springs, streams, wetlands and other surface waters.
The SWMP maps are “living documents” that must be updated throughout construction so that
they accurately reflect field conditions. This may include updating BMPs shown on drawings,
showing locations for staging/storage, waste receptacles, portable toilets, etc.
Identification of Potential Pollutant Sources
All potential pollutant sources, including materials and activities, at a site must be evaluated for
the potential to contribute pollutants to stormwater discharges. The SWMP will identify and
describe those sources that have the potential to contribute pollutants to stormwater discharges,
and the sources must be controlled through BMP selection and implementation.
At a minimum, each of the following sources and activities shall be evaluated for the potential to
contribute pollutants to stormwater discharges, and identified in the SWMP if found to have such
potential:
1) All disturbed and stored soils;
2) Vehicle tracking of sediments;
3) Management of contaminated soils;
4) Loading and unloading operations;
5) Outdoor storage activities (building materials, fertilizers, chemicals, etc.);
6) Vehicle and equipment maintenance and fueling;
7) Significant dust or particulate generating processes;
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8)
9)
10)
11)
12)
13)
Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents,
oils, etc.
On-site waste management practices (waste piles, liquid wastes, dumpsters, etc.);
Concrete truck/equipment washing, including the concrete truck chute and associated
fixtures and equipment;
Dedicated asphalt and concrete batch plants;
Non-industrial waste sources such as worker trash and portable toilets; and
Other areas or procedures where potential spills can occur.
If any of these items are evaluated and determined not to be potential pollution sources or not
applicable to the project, they should still be listed in the SWMP and listed as “determined not to
be a potential source of pollution for project.”
Material Handling, Spill Prevention, Waste Management and Disposal



Describe spill prevention procedures for petroleum products or chemicals, including
who to call for larger spills.
Describe how materials will be handled and stored.
Describe how waste materials will be management and disposal practices.
Initial Construction Activities
Clearing and Grubbing is anticipated to begin on < date>.
Prior to Work Commencing
1.
Erosion control measures will be implemented in accordance with the approved
schedule prior to any construction.
2.
Perimeter controls, stabilized construction entrance(s), and inlet protection will be
established as the first items on the SWMP.
3.
Identify and implement BMPs for other pollutants such as equipment maintenance
and vehicle washing.
4.
The locations of additional BMPs will be added to the SWMP.
Offsite Drainage
1.
The project site will be evaluated for all water draining into or through it. This may mean
protecting inlets downstream of the work area even though they are not within the
property of the project (e.g., curb inlets on streets downgradient from work area).
2.
BMPs will be used to prevent off-site water from running on-site and becoming
contaminated with sediment or other pollutants or to divert off-site flows away from
disturbed portions of the project site to prevent water contamination.
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BMPs Installed
Provide a narrative description of the number, location, and specifications of structural
BMPs installed before and during “Initial Construction Activities.” Typical BMPs may
include:

Perimeter Control

Stockpile Perimeter Control

Off-site Inlet Protection

Stabilized Construction Entrance
Also describe the maintenance, such as “Should off-site tracking occur, all practicable
measures to clean roads and storm drainage ways, at a minimum by the end of each work day,
will be utilized.”
Details of all BMPs used must be included either on the maps or in the SWMP.
During Construction
Grading and slope stabilization is anticipated to begin on < date>.
Installation of utilities is anticipated to begin on < date>.
Street construction is anticipated to begin on < date>.
Building construction is anticipated to begin on < date>.
BMPs Installed
Provide a narrative description of the number, location, maintenance requirements, and
specifications of structural BMPs installed
“During Construction.” Typical Structural and
Non-Structural BMPs may include:

Perimeter Control

Inlet / Outlet Protection.

Stabilized Construction Entrance.

Concrete Washout.

Masonry Product Control and Washout.

Street Cleaning.

Stockpile perimeter control.

Check Dams.

Erosion Control Blanket.

Minimize Disturbance Area.

Phase Construction Activity.

Control Stormwater Flowing onto and through the Project

BMPs in combination, such as on steep slopes or in flow paths.

Other BMPs such as protecting existing vegetation, creating diversion swales,
installing slope drains, limiting access, etc.
Details of all BMPs used must be included either on the maps or in the SWMP.
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Stabilizing Disturbances
Describe nonstructural BMPs including site-specific scheduling of seeding, mulching,
geotextiles, or other interim stabilization conducted after grading. Provide stabilization
schedule showing dates when areas are to be completed and stabilized. Maintain revisions
to the schedule as necessary.
Possible language to add to the SWMP as it pertains to the site:
2.
Disturbed surfaces will be left in a roughened condition as feasible by equipment
tracking, scarifying or disking the surface on contour with a 2- to 4- inch minimum
variation in soil surface.
3.
Disturbed areas where work is temporarily halted will be temporarily stabilized within
14 calendar days after activity has ceased unless work is to be resumed within 45
calendar days after the activity ceased.
4.
During the seasons when seeding does not produce vegetative cover, temporary
stabilization will occur. Temporary stabilization may consist of mulching, blanketing,
and/or other appropriate temporary stabilization methods.
5.
Construction activities will be limited to those areas within the limits of disturbance
as shown on the plans. Construction activities in addition to normal construction
procedures will include the on-site parking of vehicles or equipment, on-site staging,
on-site batch plants, haul roads or work access and any other action which would
disturb existing conditions. Off road staging areas or stockpiles must be pre-approved
by the City of Arvada. Disturbances beyond these limits will be restored to original
condition.
Final Stabilization
Permanent seeding or sod installation is anticipated to begin on < date>.
Final stabilization is anticipated to be achieved on < date>.
BMPs Installed
Provide a narrative description of the number, location, maintenance requirements, and
specifications of structural BMPs installed or maintained through “Final Stabilization.”
Typical BMPs may include:

Seed and Crimp Mulch

Erosion Control Blankets

Perimeter Control

Inlet / Outlet Protection

Other BMPs such as detention ponds, or turf reinforcement mats.
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Details of all BMPs used must be included either on the maps or in the SWMP.
Final Stabilization Methods
a)
b)
c)
The SWMP shall clearly describe the practices used to achieve final stabilization of all
disturbed areas at the site, and any planned practices to control pollutants in stormwater
discharges that will occur after construction operations have been completed at the site.
Final stabilization practices for obtaining a vegetative cover should include, as
appropriate: seed mix selection and application methods; soil preparation and
amendments; soil stabilization practices (e.g., crimped straw, hydro mulch or rolled
erosion control products); and appropriate sediment control BMPs as needed until final
stabilization is achieved; etc.
Final stabilization is reached when all ground surface disturbing activities at the site have
been completed, and uniform vegetative cover has been established with an individual
plant density of at least 70 percent of predisturbance levels, or equivalent permanent,
physical erosion reduction methods have been employed.
Seeding Plan
Describe the seeding and sod installation proposed onsite, including:

Areas of irrigated turf.

Areas of sod.

Areas of seed.

Seed mix and application rate.

Seeding in small areas not accessible to a drill.

Mulching application - describe and quantify mulching application to
areas seeded. Identify the content of the mulching material, including
whether it will contain tackifier.

Stabilization of slopes and ditches.

Soil conditioning and fertilizer requirements - describe and quantify fertilizer
application to areas seeded and areas sodded.
Reseeding Operations /Corrective Stabilization
Areas where seed has not germinated after one season will be evaluated by the City. Areas
that have not germinated will have seed, mulch and mulch tackifier (or blanket) reapplied.
Termination of the Site Development Permit
BMPs will be removed when 70% of preexisting cover has been established within the
disturbed project limits, or equivalent permanent, physical erosion reduction methods have
been employed.
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INSPECTION AND MAINTENANCE OF CONTROL MEASURES
Inspections will be conducted at least every 14 days and within 24 hours after any significant
precipitation event where erosion may have occurred. Maintenance or replacement of erosion
control measures will be made as soon as possible, immediately in most cases, to minimize the
discharge of pollutants.
Inspection Report / Corrective Action Log
An inspection form should contain a corrective action log. This log should describe repair,
replacement, and maintenance of BMPs undertaken based on the inspections, date completed,
and note the person that completed the work.
The log should also describe changes and updates to the SWMP, including additions of new
BMPs, replacement of failed BMPs, significant changes in the activities or their timing on the
project, changes in personnel, and updates to site maps.
TRAINING
Staff and subcontractors will be trained to identify stormwater BMPs and how to prevent
problems with them, such as not driving onsite unless through the vehicle tracking control or
taking care to not to damage BMPs. Documentation on training at safety meetings or otherwise
will be kept on file with the SWMP, including dates, number of attendees, subjects covered, and
length of the training.
POST-CONSTRUCTION BMPS
Describe all post-construction stormwater management measures that will be installed during the
construction process to control pollutants in stormwater discharges after construction operations
have been completed. Example of post-construction BMPs include:









Biofilters
Detention/retention devices
Earth dikes, drainage swales, and lined ditches
Infiltration basins
Porous pavement
Other proprietary structural BMPs
Outlet protection/velocity dissipation devices
Slope protection
Vegetated strips and/or swales
If an HOA has been established or a management company has been contracted, their contact
information will be provided to the City for post-construction BMP maintenance.
RECORDKEEPING
1.
Accurate and complete records will be kept, and maintained for a m i n i m u m o f
three years after the Site Development Permit is terminated.
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2.
The SWMP should be considered a "living document" that will be continuously
reviewed and modified, including but not limited to: additions, deletions, and changing
locations of BMPs. These changes will be marked in the plans, dated and initialed at
time of occurrence.
3.
All inspection and maintenance activities or other repairs will be documented and the
records kept for review by the City.
4.
Records of spill, leaks or overflows that result in the discharge of pollutants must be
documented and maintained. Information that should be recorded for all occurrences
include the time and date, weather conditions, reasons for spill, etc. A release of any
chemical, oil, petroleum product, sewage, etc., which may enter state waters must be
reported immediately to the City at 720-898-7800 (720-898-7820 after hours), and the
State of Colorado Spill Hotline at 1-877-518-5608.
5.
Incidents of noncompliance, such as uncontrolled releases of pollutants including
mud, muddy water or measurable quantities of sediment found off-site will be noted,
along with a brief explanation as to measures taken to prevent future violations and
measures taken to clean up sediment that has left the site.
6.
Changes (other than the addition of BMPs or changing a BMP to an equivalent type of
BMP) to the City of Arvada reviewed plans will need to be approved by the City’s
Stormwater Inspector for the site.
FAILURE TO PERFORM
Failure to implement SWMP puts the project in automatic violation of the Site
Development Permit. Failure to comply with the City of Arvada Site Development Permit
requirements will constitute a violation punishable by fines of up to $999 per day per
violation, withholding of building permits and/or certificates of occupancy, or stop work.
Systemic violators are punishable by criminal prosecution.
Failure to comply with the Colorado Department of Public Health and Environment Permit
requirements will constitute a violation by the Contractor. Civil penalties for violations can be
up to $10,000 per day, and a criminal pollution of state water is punishable by fines of up to
$25,000 per day. For additional information, review the permit on file or go on-line to the
CDPHE web site at https://www.colorado.gov/pacific/cdphe/news/water-quality-permits.
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EXAMPLE APPENDICES
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H
Appendix I
Appendix J
General Location map
Site Maps
Copy of the State Construction General Permit
Copy of the City Site Development Permit
Inspection Reports
Corrective Action Log
Training Records
BMP Specifications and Details
Post-Construction BMP Locations and Details
Additional Information – Endangered Species, Historic Preservation
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