HomeMy WebLinkAboutELIZABETH STREET FARMS - FDP - FDP170037 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER MANAGEMENT PLANStorm Water Management Plan
Elizabeth Street Farms
West Elizabeth Street and Pear Street
Project Owner:
High Plains Builders, LLC
Attention: Tony Wille
P.O. Box 2796
Gillette, Wyoming 82717
Phone: (307) 257-2352
Prepared By:
Galloway & Company, Inc.
5265 Ronald Reagan Blvd., Suite 210
Loveland, Colorado 80534
Contact: Herman Feissner, P.E.
Phone: (970) 800-3300
SWMP Preparation Date: December 27, 2017
Estimated Project Dates:
Project Start Date: TBD
Project Completion Date: TBD
Project Owner/Developer Signature Block
I have reviewed the information contained within the Stormwater Management Plan and accept
responsibility for the requirements set forth.
_________________________________ __________________
Permittee/Affiliation Date
Plan Preparer Signature Block
I acknowledge my responsibility for the preparation of the Stormwater Management Plan.
__________________________________ __________________
Colorado Professional Engineer Date
Herman H. Feissner | PE. 38066
STANDARD EROSION AND SEDIMENT CONTROL NOTES
1) The erosion control inspector must be notified at least 24 hours prior to any construction on
this site.
2) There shall be no earth disturbing activity outside the limits designated on the accepted plans.
3) BMPs shall be installed prior to any land disturbing activity (e.g., stockpiling, stripping, grading,
etc). Erosion control measures must be installed at the appropriate time in the construction
sequence as indicated in the approved project schedule, construction plans and erosion control
report.
4) During construction, the developer shall be responsible for preventing and controlling on-site
erosion including, keeping the property sufficiently watered so as to minimize wind-blown
sediment. The developer shall also be responsible for installing and maintaining all erosion control
facilities shown herein.
5) Pre-disturbance vegetation shall be protected and retained wherever possible. Removal or
disturbance of existing vegetation shall be limited to the area required for immediate construction
operations, and for the shortest practical period of time.
6) Soils exposed during land disturbing activity (stripping, grading, utility installations, stockpiling,
filling, etc.) shall be kept in a roughened condition by ripping or disking along land contours until
mulch, vegetation or other permanent erosion control is installed. No soils in areas outside the
project street rights-of-way shall remain exposed by land disturbing activity for more than thirty-
(30) days before required temporary or permanent erosion control (e.g. seed/mulch, landscaping,
etc.) is installed, unless otherwise approved by the local entity.
7) Temporary (structural) erosion control measures must be inspected and repaired or
reconstructed as necessary after each runoff event and every fourteen-(14) days in order to
assure continued performance of their intended function, remain in place until such time as the
surrounding disturbed areas are sufficiently stabilized as determined by the erosion control
inspector, and be removed after the site has been sufficiently stabilized as determined by erosion
control inspector.
8) When temporary erosion control measures are removed, the developer shall be responsible
for the clean-up and removal of sediment and debris from drainage infrastructure and other public
facilities.
9) The contractor shall clean-up inadvertently deposited material immediately and make sure
streets are free of materials (e.g., sediment) by the end of each working day.
10) Retained sediments, particularly those on paved roadway surfaces, shall be removed and
disposed of in a manner and location so as not to cause their release into any waters of the United
States.
11) No soil stockpile shall exceed ten-(10) feet in height. Soil stockpiles shall be protected from
sediment transport by surface roughening, watering and perimeter silt fencing. Any soil stockpile
remaining after 30 days shall be seeded and mulched.
12) The stormwater volume capacity of detention ponds will be restored and storm sewer lines
will be cleaned upon completion of the project and before turning the maintenance over to the
local entity or homeowners association (HOA).
13) City ordinance and the Colorado Discharge Permit System (CDPS) requirements make it
unlawful to discharge or allow the discharge of any pollutant or contaminated water from
construction sites. Pollutants include, but are not limited to, discarded building materials, concrete
truck washout, chemicals, oil and gas products, litter and sanitary waste. The developer shall take
reasonable measures necessary to assure the proper containment and disposal of pollutants on
the site in accordance with applicable local, state, and federal regulations.
14) A designated area shall be provided on-site for concrete truck chute washout. The area shall
be constructed so as to contain washout material and be located at least fifty-(50) feet away from
any waterway during construction. Upon completion of construction activities, the concrete
washout material will be removed and properly disposed of prior to the area being restored.
15) To ensure that sediment does not move off of individual lots, one or more of the following
sediment/erosion control BMPs shall be installed and maintained until the lots are sufficiently
stabilized, as determined by the erosion control inspector (within Loveland GMA and city limits
only).
a) Below gutter downspouts.
b) Out to drainage swales.
c) Along lot perimeter.
d) Other locations, if needed.
16) Conditions in the field may warrant erosion control measures in addition to what is shown on
these plans. The developer shall implement whatever measures are determined necessary, as
directed by the city/county.
17) A vehicle tracking control pad shall be installed when needed for construction equipment,
including but not limited to personal vehicles exiting existing roadways. No earthen materials (i.e.,
stone, dirt, etc.) shall be placed in the curb & gutter or roadway as a ramp to access temporary
stockpiles, staging areas, construction materials, concrete washout areas and/or building sites.
TABLE OF CONTENTS
SECTION 1 SITE DESCRIPTION
i. Site Location
ii. Description of Adjacent Areas
A. Nature and Purpose of Construction Activity at the Site
B. Proposed Sequence for Major Activities
C. Estimates of the Total Site Area, and the Area and Location Expected to be Disturbed
D. Topography, Soils and Rainfall Data
E. Existing Vegetation and an Estimate of the Percent Vegetative Ground Cover
F. Location and Description of Potential Pollution Sources
G. Location and Description of anticipated Allowable Non-Stormwater Discharges at the
Site
H. Receiving Waters and Size, Type and Location of any Outfalls
SECTION 2 SITE MAP
SECTION 3 STORMWATER MANAGEMENT CONTROLS
A. SWMP Administrator and Important Contacts
B. Identification of Potential Pollutant Sources
C. BMPs for Stormwater Pollution Prevention
1. Structural Practices for Erosion and Sediment Control
2. Non-Structural Practices for Erosion and Sediment Control
3. Phased BMP Implementation
4. Materials Handling and Spill Prevention
5. Dedicated Concrete or Asphalt Batch Plants
6. Vehicle Tracking Control
7. Waste Management and Disposal, Including Concrete Washout
8. Groundwater and Stormwater Dewatering
SECTION 4 FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT
A. Practices Used to Achieve Final Stabilization of Disturbed Areas at the Site
B. Final Stabilization Practices for Obtaining Vegetative Cover
SECTION 5 INSPECTIONS AND MAINTENANCE
APPENDIX A - Floodplain information
APPENDIX B - Soils Information
APPENDIX C - Erosion and Sediment Control Escrow/Security Calculations
APPENDIX D - Construction Sequence Matrix
APPENDIX E - Best Management Practice (BMP) Details
APPENDIX F - Colorado Discharge Permit System (CDPS) Application
APPENDIX G - Sample Inspection Log
APPENDIX H - Site Map and Design Drawings
SECTION 1 SITE DESCRIPTION
i. Site Location
Elizabeth Street Farms (hereafter referred to as “the site” or “project site”) is located at 2620
West Elizabeth Street. The site is bounded on north by single-family residential development
and Pear Street right-of-way (existing cul-de-sac); on the south by West Elizabeth Street; and
on the east and west by single-family residential development. More specifically, the site is
Tract A of West Plum Street – a Planned Unit Development situate in the north half of Section
16, Township 7 north, Range 69 west of the 6th Principal Meridian, City of Fort Collins, County
of Larimer, State of Colorado. Refer to SECTION 2 for a Vicinity Map showing the project site
location and surrounding areas.
Project Coordinate Location:
• Longitude: 105° 7'30.20"W
• Latitude: 40°34'31.16"N
CDPS Permit #: To Be Determined
*A blank copy of the Application is included in Appendix F. REPLACE this with a completed and signed copy.
ii. Description of Adjacent Areas
The site is bounded on the north by residential development and the Pear Street cul-de-sac;
on the south by West Elizabeth Street; on the east by residential development; and on the
west by residential development.
The project site consists of ±2.56 acres. It is largely vacant and undeveloped. Previously the
site was used for agriculture. An existing two-story brick house, which the developer plans to
restore, is located in the southeast region of the site. An existing irrigation lateral, which is still
in use, crosses the site from west to east. The existing grades average between 0.50% and
1.00%. Locally steeper grades exist along the irrigation lateral and around the existing house.
The existing runoff flows from northwest to southeast. An existing swale along the north edge
of West Elizabeth Street captures existing runoff and conveys it east. There are no major
drainage ways passing through the project site.
A. NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY AT THE SITE
The purpose of this construction activity is to prepare the site for single family residential housing
construction. Construction activity common to this type of development includes: grubbing, rough
grading, installing underground utility mains and service extensions, constructing internal
roadways and establishing finished grade across the site. Final stabilization includes roadways,
sidewalks, parking areas and landscaping.
B. PROPOSED SEQUENCE OF MAJOR ACTIVITIES
- Estimated project start date: To Be Determined
- Estimated project completion date: To Be Determined
Major Phases of Construction:
* Refer to Appendix D for the Construction Sequence Matrix.
- Install initial erosion and sediment controls, such as Silt Fence (SF) and Vehicle Tracking
Control (VTC) prior to the start of earth disturbing activity.
- Strip the site of existing topsoil, remove existing improvements and overlot grade all
phases. This includes grading the stormwater quality features and detention pond.
- Install utilities (e.g., domestic water, sanitary sewer and storm sewer)
- Construct internal roadways.
- Additional erosion and sediment control measures will be installed as the underground
storm drain system is constructed. For example, Outlet Protection (OP) will be placed at
the newly constructed outlet structure.
- Erosion and sediment control measures will remain in place until final stabilization has
been achieved. The contractor will prepare a detailed construction sequence, including
BMP installation timing, for inclusion in the SWMP.
Final stabilization is anticipated to be performed by the installation of landscaping materials and
seeding where required by the landscape plans. Refer to Appendix H and sheets LS1-LS3.
C. ESTIMATES OF THE TOTAL SITE AREA, AND THE AREA AND LOCATION EXPECTED
TO BE DISTURBED
The total area of the site within the project boundaries is ±2.56 acres. The overlot grading, utility
installation and roadway construction will account for approximately ±2.53 acres of land
disturbance within the project.
Earthwork estimates:
- Cut of 353 cubic yards
- Fill of 2205 cubic yards
- Net Cut of 1852 cubic yards
D. TOPOGRAPHY, SOILS AND RAINFALL DATA
The existing on-site grades average between 0.50 and 1.0 percent. The existing runoff flows from
northwest to southeast. An existing swale along the north edge of West Elizabeth Street captures
existing runoff and conveys it east. The maximum elevation difference across the site is ±4 feet
(5111 feet – 5107 feet).
According to the USDA NRCS Web Soil Survey, ‘Altvan-Satanta loams, 0 to 3 percent slopes’
covers roughly one-third of the project site. The remaining two-thirds of the site are ‘Altvan-
Satanta loams, 3 to 9 percent slopes’. These soils are associated with Hydrologic Soil Group
(HSG) ‘B’. HSG ‘B’ soils have a moderate infiltration rate when thoroughly wet. These consist
chiefly of moderately deep or deep, moderately well drained or well drained soils that have
moderately fine texture to moderately coarse texture. These soils have a moderate rate of water
transmission. Refer to Appendix B for additional soils information.
Hollingsworth Associates, Inc. conducted a subsurface study of the project site. The results of the
preliminary geotechnical investigation are summarized in Subsurface Study for Ten Lots West
Elizabeth Subdivision Fort Collins, Colorado (Job No.: 16-469 | Dated: October 12, 2016). The
subsurface conditions across the lots were quite uniform, as indicated by exploratory borings B-
1 through B-5, and consisted of 12 inches of topsoil, 2 to 11 feet of medium stiff to stiff sandy clay,
which occasionally graded into clayey sand, and 2 feet to 5 feet of firm to medium hard,
interlayered and integrated weathered claystone/sandstone overlaying hard to very hard
claystone for the depth drilled, 21 feet.
Normal Monthly Precipitation Table in Inches
Jan Feb Mar Apr May June July Aug. Sept. Oct. Nov. Dec.
0.36 0.48 1.18 1.97 2.74 1.83 1.62 1.42 1.27 1.13 0.59 0.49
Source:www.wrcc.dri.edu/cgi-bin/cliMAIN.pl?co5236
Percent Impervious Cover and Runoff Coefficients
Percentage impervious area before construction: 2%
Runoff coefficient before construction (C2): 0.22
Percentage impervious area after construction (grading): 56%
Runoff coefficient after construction (C2): 0.59
E. EXISTING VEGETATION AND AN ESTIMATE OF THE PERCENT VEGETATIVE
GROUND COVER
The existing site is a partially developed tract of land with an existing house, outbuildings, and
some agricultural area. The existing ground cover consists of native grasses, weeds, and trees.
The percentage of existing vegetative ground cover is fair, 50 percent.
Photograph 1: Looking northwest from the intersection of West Elizabeth Street and Timber Lane.
Final stabilization will include an individual plant density of at least 70 percent of pre-disturbance
levels, or equivalent permanent, physical erosion reduction methods. Most of the total disturbed
area will be permanently stabilized with asphalt, concrete, or roof area. The remaining area will
be stabilized with landscaping such as sod and planting beds.
F. LOCATION AND DESCRIPTION OF POTENTIAL POLLUTION SOURCES
During construction there is potential for pollution from grading, utility and roadway construction
activities. These earth disturbing activities will occur across the site. The potential for pollution
also arises from equipment and material staging areas, equipment refueling and maintenance,
equipment washing and the on-site use of paints, solvents and other chemicals common to this
type of construction activity.
Additionally there is a potential for pollution from the concrete washout area, worker’s trash and
portable toilets. Since the location of this potential pollution is dictated by the current construction
activity, they will be shown and updated on the SWMP by the SWMP Administrator.
G. LOCATION AND DESCRIPTION OF ANTICIPATED ALLOWABLE NON-STORMWATER
DISCHARGES AT THE SITE
Discharges covered by this permit shall be composed entirely of stormwater associated with
construction activity. Discharges from the following sources that are combined with stormwater
discharges associated with construction activity may be authorized by this permit, provided that
the non-stormwater component of the discharge is identified in the SWMP. Examples include:
emergency firefighting activities, landscape irrigation return flow and uncontaminated springs.
Discharges to the ground of concrete washout water from washing of tools and concrete mixer
chutes may be authorized by this permit, provided that:
1) The source is identified in the SWMP
2) BMPs are included in the SWMP to prevent pollution of groundwater
3) These discharges do not leave the site as surface runoff or to surface waters
A designated contained Concrete Washout Area (CWA) is shown on the SWMP. Refer to
Appendix E for installation, maintenance and removal information. The practices used for
concrete washout must ensure that these activities do not result in the contribution of pollutants
associated with the washing activity to stormwater runoff. The SWMP shall clearly describe and
locate the practices to be used that will ensure that no washout water from concrete washout
activities is discharged from the site as surface runoff or to surface waters.
H. RECEIVING WATERS AND SIZE, TYPE AND LOCATION OF ANY OUTFALLS
The majority of runoff from the project site will be conveyed through the site via overland flow to
swales in the backs and fronts of the lots. These swale sections will then drain into a proposed
on-site detention pond. The on-site detention pond will then discharge the flow at a defined rate
into the flowline of West Elizabeth Street. A small portion of the site (~0.28 acres or ~11%) will
drain north into Pear Street and eventually into an existing detention pond.
SITE MAPS
Refer to Appendix H for Site Map
Erosion Control | C8.0
VICINITY MAP
Vicinity Map – Elizabeth Street Farms
Not to Scale
Elizabeth Street
Farms
SECTION 2: DESIGN DRAWINGS
Refer to Appendix H for Design Drawings
Overall Grading Plan | C3.0
Landscape Plan | LS2-LS3
SECTION 3: STORMWATER MANAGEMENT CONTROLS
A. SWMP ADMINISTRATOR AND IMPORTANT CONTACTS
SWMP Administrator
Name:
Title:
Company:
Phone:
E-mail:
The SWMP Administrator is responsible for developing, implementing, maintaining and revising
the SWMP. The SWMP Administrator is the contact for all SWMP-related issues and is the person
responsible for its accuracy, completeness, and implementation. Therefore, the SWMP
Administrator should be a person with authority to adequately manage and direct day-to-day
stormwater quality management activities at the site.
The SWMP Administrator is responsible for holding a weekly storm water meeting attended by
the General Contractor and the contractors and subcontractors involved in earth disturbing
activities. The purpose is to review the requirements of the Permit(s), the SWMP and address any
problems that have come up with implementing the SWMP or maintaining the BMPs. The
Contractor shall maintain a log of the weekly meetings and document the issues addressed in the
meetings.
B. IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES
The following sources and activities have been evaluated for the potential to contribute pollutants
to stormwater discharges, and identified in the SWMP if found to have such potential:
• Disturbed and Stored Soils: The site will be grubbed and overlot graded prior to major
utility and roadway construction. The overlot grading work can occur across the site or in
the current phases of development. If the entire site is grubbed and overlot graded, the
future phases should then receive temporary seeding and mulching within 7 days of the
last disturbance if no further disturbance is expected for at least 14 days. Additional
strategies for minimizing erosion and sediment control can be found in Stockpile
Management (SP).
• Vehicle Tracking of Sediments: There is potential for tracking of soils between the
beginning of the grading process and the final stabilization of the site. Vehicle Tracking
Control (VTC) is to be installed prior to land disturbance activities and sweeping is to take
place as needed. Vehicle access to the exposed and disturbed subgrade will be limited
primarily to roll on/off earthmoving equipment and heavy materials delivery trucks. The
SWMP Administrator is responsible for ensuring that access to exposed subgrade is
limited, both in quantity and in timing relative to the tracking susceptibility of the soil as it
relates to moisture content. The SWMP Administrator must keep the adjacent parking
areas and public rights-of-way free from mud and other tracked debris from the site.
• Management of Contaminated Soils: We are not aware of contaminated soils that exist
within the limits of the proposed earth disturbing activity. Our knowledge of the pre-
development activities within the site does not suggest that contimainated soils will be
discovered during the construction process.
• Loading and Unloading Operations: Loading and unloading operations of equipment
shall be carried out in areas protected by erosion and sediment controls. It is
recommended that equipment be cleaned on-site and within protected areas prior to
exiting the site.
• Vehicle and Equipment Maintenance and Fueling: Reference Good Housekeeping
Practices (GH) in Appendix E for additional information about good housekeeping
practices designed to prevent pollution associated with solid, liquid and hazardous
construction-related materials and wastes.
If equipment is to be maintained and stored in an open area this area should not be within
the drip line of trees and not be within 100 feet of a watercourse or wetland. Runoff should
be diverted away from watercourses and wetlands. Maintenance should be done on
impervious areas surrounded with impervious berms. Where this is not possible, use pads
designed to contain the pollutants which may leak or spill during maintenance operations.
Impervious pads are particularly important on sandy and other coarse soils where spilled
materials can easily infiltrate and possibly leach into the groundwater. Equipment shall be
checked before and after each use and, at a minimum, during the weekly stormwater
inspection if otherwise idle. Periodic checks of the equipment wash areas shall be
performed to ensure proper operation.
Temporary on-site fuel tanks for construction vehicles shall meet applicable state and
federal regulations. Tanks shall have approved spill containment with the capacity
required by the applicable regulations. From NFPA 30: tanks shall be provided with
secondary containment (i.e., containment external to and separate from primary
containment). Secondary containment shall be constructed of materials of sufficient
thickness, density and composition so as not to be structurally weakened as a result of
contact with the fuel stored and capable of containing discharged fuel for a period of time
equal to or longer than the maximum anticipated time sufficient to allow recovery of
discharged fuel. It shall be capable of containing 110% of the volume of the primary tank
if a single tank is used, or in the case of multiple tanks, 150% of the largest tank or 10%
of the aggregate, whichever is larger.
The tanks shall be in sound condition free of rust or other damage which might
compromise containment. Fuel storage areas will meet applicable EPA, OSHA and other
regulatory requirements for signage, fire extinguisher, etc. Hoses, valves, fittings, caps,
filler nozzles and associated hardware shall be maintained in proper working condition.
The location of fuel tanks shall be shown on the Site Maps and shall be located to minimize
exposure to weather and surface water drainage features.
A Spill Prevention, Control and Countermeasure (SPCC) Plan must be developed if
aboveground oil storage capacity at the construction site exceeds 1,320-gallons or as
specified by the state. Containers with a storage capacity of 55-gallons or less are not
included when calculating site storage capacity. The General Contractor shall develop
and implement a SPCC Plan in accordance with the Oil Pollution Prevention regulation at
Title 40 of the Code of Federal Regulations, Part 112, (40 CFR 112).
• Concrete Truck/Equipment Washing: A Concrete Washout Area (CWA) shall be
installed prior to any concrete placement on-site. Signs shall be placed at the construction
entrance(s), at the washout area and elsewhere as necessary to clearly indicate the
location of the concrete washout area. The washout area shall be repaired and enlarged
or cleaned out as necessary to maintain capacity for wasted concrete. Concrete and
concrete wash water shall be removed from the site and disposed of at an accepted waste
facility.
• Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt or concrete
batch plant is anticipated with the proposed construction activity.
• Non-Industrial Waste Sources:
Portable toilets: Personnel involved with construction activities must comply with state and
local sanitary or septic system regulations. Temporary sanitary facilities will be provided
at the site throughout the construction phase. They must be utilized by construction
personnel and must be serviced weekly by a commercial operator. The location of sanitary
facilities shall be shown on the Site Maps. Portable toilets must be securely anchored a
minimum of 10’ behind curbs, and are not allowed within 50’ of inlets or within 50’ of a
water of the State or the municipal storm drain system.
Worker’s trash: The site shall be policed at the end of each work day to be kept free of
trash and debris resulting from workers day-to-day activities. If necessary, place clearly
marked and protected containers for trash and debris at convenient locations throughout
the site. The burying of waste on-site is prohibited. Trash must be properly contained at
the end of each day.
C. BMPs FOR STORMWATER POLLUTION PREVENTION
Best Management Practices (BMPs) are defined as a method, activity, maintenance procedure
or other management practice for reducing the amount of pollution entering a water body. The
term originated from rules and regulations in Section 208 of the Clean Water Act (CWA).
The SWMP shall identify and describe appropriate BMPs that will be implemented at the facility
to reduce the potential of the sources previously identified to contribute pollutants to stormwater
discharges. The SWMP shall clearly describe the installation and implementation specifications
for each BMP identified in the SWMP to ensure proper implementation, operation and
maintenance of the BMP.
Beginning with mobilization, and throughout the construction process, erosion control devices
shall be installed and maintained to minimize pollutant migration. The BMPs may be installed or
implemented in phases, or not at all, depending on actual conditions encountered at the site. It is
the responsibility of the Administrator determine what practices should be employed and when.
In the event that a review agency deems BMPs to be insufficient, it shall be the responsibility of
the Administrator to implement modifications as directed.
The Erosion Control Plan (refer to Appendix H) illustrates the initial placement of each structural
BMPs. Details for recommended BMPs are included in Appendix E. These details provide specific
installation and maintenance information.
STRUCTURAL PRACTICES
* Refer to Appendix E for details
The SWMP shall clearly describe and locate structural practices implemented at the site to
minimize erosion and sediment transport. Practices may include, but are not limited to: straw
bales, wattles/sediment control logs, silt fences, earth dikes, drainage swales, sediment traps,
subsurface drains, pipe slope drains, inlet protection, outlet protection, gabions, and temporary
or permanent sediment basins.
• Silt Fence (SF): Silt fence is a synthetic permeable woven or non-woven geotextile fabric
incorporating support stakes at intervals sufficient to support the (5-feet maximum
distance between posts) water and sediment retained by the fence. The fence is designed
to retain sediment-laden storm water and allow settlement of suspended soils before the
stormwater flows through the fabric. Silt fence shall be located on the contour to capture
overland, low-velocity sheet flows.
• Vehicle Tracking Control (VTC): A Vehicle Tracking Control (VTC) pad shall be
provided to minimize tracking of mud and sediment onto paved surfaces and neighboring
roadways. The vehicle tracking control pad shall be installed prior to any earth disturbing
activity (e.g., stockpiling, stripping, grading, etc.). The vehicle tracking control pad should
be located at existing and future vehicle accesses being used during construction. These
locations will primarily be dictated by gates or openings in the temporary construction
fencing.
Vehicle tracking pads should be inspected for degradation. The aggregate material should
remain rough and be replaced if the area becomes clogged with water and/or excess
sediment.
It may also be necessary to install a wheel wash system. If this is done, a Sediment Trap
(ST) control must be installed to treat the wash water before. Discharge must be directed
to the detention pond within the limits of construction as indicated.
• Inlet Protection (IP): Inlet protection should be installed at storm sewer inlets that are
operable during construction. It generally consists of permeable barriers installed around
an inlet to filter runoff and remove sediment before the water enters the storm drain inlet.
The primary mechanism is to place controls in the path of flow sufficient to slow the
sediment-laden water to allow settlement of suspended soils before discharging into the
storm sewer. It is possible that as construction progresses from storm sewer installation
through to paving that the inlet protection devices should change. Inlet protection devices
create ponding of storm water. This should be taken into consideration when deciding on
which device or devices should be used.
• Straw Wattles (SW), Sediment Control Logs (SCL) or Fiber Rolls (FR): Straw wattles,
sediment control logs, or fiber rolls consist of straw, compost, excelsior or coconut fiber
that are staked to the ground and designed to prevent sediment transfer. The wattles are
designed to retain sediment-laden storm water and allow settlement of suspended soils
before the storm water flows through the wattle. Straw wattles shall be located on the
contour to capture overland, low-velocity sheet flows.
• Rock Sock (RS): A rock sock is constructed of gravel that has been wrapped by wire
mesh or a geotextile to form an elongated cylindrical filter. Rock socks are intended to trap
sediment from stormwater runoff that flows onto roadways as a result of construction
activities. Rock socks are typically used either as a perimeter control or as part of inlet
protection. When placed at angles in the curb line, rock socks are typically referred to as
curb socks.
• Concrete Washout Area (CWA): A concrete washout area should be provided on-site.
The concrete washout area can be a lined or unlined excavated pit in the ground, a
commercially manufactured prefabricated container or an aboveground holding area. The
concrete washout area must be located a minimum of 400 feet from any natural drainage
way or body of water and at least 1000 feet from any wells or drinking water sources. If
not lined, the concrete washout area should not be located in an area where shallow
groundwater may be present. The Administrator shall clearly show the desired location
and access to the concrete washout area on the SWMP. Clear signage identifying the
concrete washout should also be provided.
The Administrator shall place a Vehicle Tracking Pad (VTC) if the selected location for the
Concrete Washout Area is detached from pavement.
The concrete washout area should be inspected regularly with particular attention being
paid to signage to ensure that the area is clearly marked. Confirmation that the washout
is being used should also be noted to ensure that other undesignated areas of the site are
not being used incorrectly as a concrete washout area.
• Stabilized Staging Area: This is a clearly designated area where construction equipment
and vehicles, stockpiles, waste bins and other construction-related materials are stored.
The stabilized storage area consists of a stabilized surface, covered with 3-inch diameter
aggregate or larger.
NON-STRUCTURAL PRACTICES
The SWMP shall clearly describe, as applicable, all non-structural practices implemented at the
site to minimize erosion and sediment transport. Description must include interim and permanent
stabilization practices, and site-specific scheduling for implementation of the practices. The
SWMP should include practices to ensure that existing vegetation is preserved where possible.
Non-structural practices may include, but are not limited to: temporary vegetation, permanent
vegetation, mulching, geotextiles, sod stabilization, slope roughening, vegetative buffer strips,
protection of trees, and preservation of mature vegetation.
• Good Housekeeping Practices (GH): Good housekeeping practices include providing
waste management, establishing proper building material staging areas, designating paint
and concrete washout areas, establishing proper equipment and vehicle fueling and
maintenance practices, controlling equipment and vehicle washing and allowable non-
storm water discharges and developing a spill prevention and response plan.
• Surface Roughening (SR): Surface roughening consists of tracking, scarifying,
imprinting or tilling a disturbed area to provide temporary stabilization of disturbed areas.
It is used to provide temporary stabilization of disturbed areas, such as when re-vegetation
cannot be immediately established.
• Temporary and Permanent Seeding (TS/PS): Denuded areas that will be inactive for
fourteen-(14) days or more must be stabilized temporarily with the use of fast-germinating
annual grass/grain varieties appropriate for site soil and climate conditions, straw/hay
mulch, wood cellulose fibers, tackifiers or netting and/or blankets. Stockpiles and diversion
ditches/berms must be stabilized to prevent sediment, erosion and dust issues.
• Permanent Seeding, Sodding or Mulching (TS/PS): Areas at final grade must be
seeded or sodded within fourteen-(14) days after completion of work in that area. Prepare
soil and seed immediately after final grade is achieved. On completion of earth disturbing
activities, the entire site must have permanent vegetative cover meeting vegetative density
requirements or mulch per the landscape plan in areas not covered by hardscape (e.g.,
asphalt, concrete, pavers, buildings, etc.). Except for small (<100 sq.ft.) level spots,
seeded areas should be protected with mulch, tackifier or a rolled erosion control product.
Mulch must be crimped by disc or other machinery.
• Soil Stockpile Management (SP): Soil stockpiles should be located away from drainage
system components including storm sewer inlets. Sediment control BMPs should be
placed around the perimeter of stockpiles. Soils stockpiled for more than thirty-(30) days
should be seeded and mulched with a temporary grass cover.
PHASED BMP IMPLEMENTATION
This project is expected to be constructed in one phase so implementation of BMPs based on
phases does not apply.
Should there be changes to the implemented BMPs, the Administrator shall be notified and the
SWMP must be modified to accurately reflect the field conditions. Examples include, but are not
limited to, removal of BMPs, identification of new potential pollutant sources, addition of BMPs,
modification of BMP installation and implementation criteria or maintenance procedures and
changes in items included in the Site Map and/or description. SWMP revisions must be made
prior to changes in site conditions, except for responsive SWMP Changes, as follows:
• SWMP revisions must be made immediately after changes are made in the field to address
BMP installation and/or implementation issues; or
• SWMP revisions that require the development of supporting documentation (e.g., design
of retention pond capacity) must be made as soon as practicable, but in no case more
than seventy-two-(72 hours), after change(s) in BMP installation and/or implementation
occur at the site.
This SWMP should be viewed as a “living document” that is to be continuously reviewed and
modified as part of the overall process of assessing and managing storm water quality issues on-
site.
MATERIALS HANDLING AND SPILL PREVENTION
The SWMP shall clearly describe and locate all practices implemented at the site to minimize
impacts from procedures or significant materials that could contribute pollutants to runoff. Such
procedures or significant materials could include: exposed storage of building materials; paints
and solvents; fertilizers or chemicals; waste material; and equipment maintenance or fueling
procedures.
Areas or procedures where potential spills can occur must have spill prevention and response
procedures identified in the SWMP.
Any hazardous or potentially hazardous material that is brought onto the construction site will be
handled properly in order to reduce the potential for storm water pollution. Materials used on this
construction site will be properly stored including the use of secondary containment measures,
handled, dispensed and disposed of following applicable label directions. Flammable and
combustible liquids will be stored and handled according to 29 CFR 1926.152. Only approved
containers and portable tanks shall be used for storage and handling of flammable and
combustible liquids.
Material Safety Data Sheets (MSDS) information will be kept on-site for applicable materials.
In the event of an accidental spill, immediate action will be undertaken by the General Contractor
to contain and remove the spilled material. Hazardous materials will be disposed of by the
Contractor in the manner specified by federal, state and local regulations and by the manufacturer
of such products. As soon as possible, the spill will be reported to the appropriate agencies. As
required under the provisions of the Clean Water Act, any spill or discharge entering waters of
the United States will be properly reported. The General Contractor will prepare a written record
of spills and associated clean-up and will notify the Town of Johnstown (970-587-4664) and the
Colorado Department of Public Health and Environment (CDPHE) (1-877-518-5608). The
General Contractor will provide notice to Owner immediately upon identification of a reportable
spill.
Any spills of petroleum products or hazardous materials in excess of Reportable Quantities as
defined by EPA or the state or local agency regulations, shall be immediately reported to the EPA
National Response Center (1-800-424-8802), the Colorado Department of Public Health and
Environment (CDPHE) (1-877-518-5608) and the Town of Johnstown (970-587-4664).
The State reportable quantity for petroleum products is 25 gallons or more (or that cause sheen
on nearby surface waters). Spills from regulated aboveground and underground fuel storage
tanks must be reported to the State Oil Inspector within 24 hours (after-hours contact CDPHE
Emergency Spill Reporting Line). This includes spills from fuel pumps. Spills or releases of
hazardous substances from regulated storage tanks in excess of the reportable quantity (40 CFR
Part 302.6) must be reported to the National Response Center, the local fire authority
immediately, the State Oil Inspector and the Town of Johnstown within 24 hours.
In order to minimize the potential for a spill of petroleum products or hazardous materials to come
in contact with storm water, the following steps will be implemented:
a) Materials with hazardous properties (such as pesticides, petroleum products,
fertilizers, detergents, construction chemicals, acids, paints, paint solvents, additives
for soil stabilization, concrete, curing compounds and additives, etc.) will be stored,
including secondary containment measures in a secure location and under cover,
when not in use.
b) The minimum practical quantity of materials will be kept on the job site and
scheduled for delivery as close to the time of use as practical.
c) A spill control and containment kit (containing for example, absorbent material
such as kitty litter or sawdust, acid neutralizing agent, brooms, dust pans, mops, rags,
gloves, goggles, plastic and metal trash containers, etc.) will be provided on the
construction site and location(s) shown on Site Maps. The kit should be inspected for
completeness as a part of weekly storm water inspections.
d) All of the product in a container will be used before the container is disposed of.
Containers will be triple rinsed, with water, prior to disposal. The rinse water used in
these containers will be disposed of in a manner in compliance with State and federal
regulations and will not be allowed to mix with stormwater discharges.
e) Products will be stored in and used from the original container with the original
product label.
f) Products will be used in strict compliance with instructions on the product label.
g) The disposal of excess or used products will be in strict compliance with
instructions on the products label and local regulations.
The contractor is responsible for the Spill Prevention and Control Plan (SPCP). If the contractor
elects to provide his own SPCP, it must be included in the Appendix as a replacement. A
contractor provided SPCP shall clearly state measures to stop the source of a spill, contain the
spill, clean up the spill, dispose of contaminated materials and train personnel to prevent and
control future spills. In addition the SPCP must include contact and documentation requirements
for each of the Minor, Significant and Hazardous spill magnitudes. Further requirements are listed
below in the equipment fueling section.
DEDICATED CONCRETE OR ASPHALT BATCH PLANTS
Neither a dedicated asphalt or concrete batch plant is anticipated with the proposed construction
activity.
VEHICLE TRACKING CONTROL
The SWMP shall clearly describe and locate all practices implemented at the site to control
potential sediment discharges from vehicle tracking. Practices must be implemented for all areas
of potential vehicle tracking, and can include: minimizing site access; street sweeping or scraping;
tracking pads; graveled parking areas; requiring that vehicles stay on paved areas on-site; wash
racks; contractor education; and/or sediment control BMPs, etc.
SECTION 4: FINAL STABILIZATION & LONG-TERM STORMWATER
MANAGEMENT
a) In accordance with Part 1.C.4.c of the CDPS General Permit for Stormwater Discharges
Associated with Construction Activity (COR-300000) (the stormwater permit):
“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 pre-disturbance levels, or
equivalent permanent, physical erosion reduction methods have been employed.”
The following criteria must be met when planning for final stabilization:
• Stabilization must be permanent
• ALL disturbed areas must be stabilized
• Alternatives must follow good practice
The stormwater permit allows the use of alternatives to vegetation to achieve final
stabilization. These alternatives must meet specific criteria to be considered equivalent to
vegetation. Examples of alternative stabilization practices include:
• Permanent Paving and Buildings
• Hardscape
• Geogrid
• Xeriscape
• Compacted and Stabilized Unpaved Driving Surfaces
The areas of the site that remain exposed by land disturbing activity for more than thirty-
(30) days, will require temporary or permanent erosion control (e.g. seed/mulch,
landscaping, etc.) to be installed, unless otherwise approved by the Stormwater
Department. As the lots and blocks achieve final stabilization (see above), the BMPs
associated with them can be removed.
b) Seed Mix Information
Species
Preferred
Varieties
Seeded Rate
(lbs. per
acre, drilled)
PLS
Seeded/acre
Leymus Cinereus Great Basin Wilrye Mangar 3 285,000
Nassella Viridula Green Needlegrass Lodorm 2 362,000
Achnatherum
Hymenoides
Indian Ricegrass Paloma, Nezpar 1 188,000
Elymus Trachycaulus Slender Wheatgrass
Primar,
Revenue 2 320,000
Elymus Lanceolatus Thickspike Wheatgrass Critana 3 580,500
Pascopyrim Smithii Western Wheatgrass Arriba, Barton 4 504,000
Totals 15 2,239,500
c) Final Stabilization Notes – Landscape Plan and Notes (LS1) and the Landscape Plan
(LS2-LS3)
SECTION 5: INSPECTION & MAINTENANCE
The contractor must keep the approved SWMP on-site at all times. An individual certified to
inspect erosion and sediment control by a recognized organization must conduct all BMP
inspections. Proof of certification shall be included in the SWMP. All regulatory authorities may
inspect the land or site covered by the SWMP at any time, without prior notice, for compliance
with the SWMP. If site conditions indicate that the objectives of this section are not being met, the
operator shall make appropriate modifications to the SWMP. Any modification must be recorded
on the owner’s copy of the SWMP and the Administrator notified. The contractor must maintain
inspection records on-site with the SWMP and such records must be provided to the regulatory
agencies for review upon request. The contractor must notify the Administrator if there is a change
in design, construction, operation or maintenance that has a significant effect on the potential for
discharge of pollutants to the MS4 or receiving waters and the SWMP must be amended. The
contractor must notify the Administrator and the SWMP amended, if the SWMP proves to be
ineffective in achieving the general objectives of controlling pollutants in stormwater discharges
associated with construction activities.
INSPECTION PROCEDURES
Between the time this SWMP is implemented and final Inactivation Notice has been submitted,
thorough inspections will occur at least every 14 calendar days. Also, post-storm event
inspections must be conducted within 24 hours after the end of precipitation event or snowmelt
that could potentially cause surface erosion. The purpose of site inspections is to assess
performance of pollutant controls. Based on these inspections the contractor, in consultation with
the Administrator (if different) will decide whether it is necessary to modify this SWMP, add or
relocate controls, or revise or implement additional Best Management Practices (BMPs) in order
to prevent pollutants from leaving the site via storm water runoff. The contractor has the duty to
cause pollutant control measures to be repaired, modified, supplemented or take additional steps
as necessary in order to achieve effective pollutant control.
Note: If a BMP is covered by snow, mark the BMP as not applicable and document the reason
the BMP can not be inspected on the daily report.
Examples of specific items to evaluate during site inspections are listed below. This list is not
intended to be comprehensive. During each inspection, the inspector must evaluate overall
pollutant control system performance as well as particular details of individual system
components. Additional factors should be considered as appropriate to the circumstances.
• Vehicle Tracking Control (VTC): Locations where vehicles enter and exit the site must
be inspected for evidence of off-site sediment tracking. A stabilized construction exit shall
be constructed where vehicles enter and exit. Exits shall be maintained or supplemented
as necessary to prevent the release of sediment from vehicles leaving the site. Any
sediment deposited on the roadway shall be swept as necessary throughout the day or at
the end of every day and disposed of in an appropriate manner. Sediment shall NOT be
washed into storm sewer systems.
• Erosion Control Devices: Rolled Erosion Control Products (i.e., nets, blankets, turf
reinforcement mats) and marginally vegetated areas (i.e., areas not meeting required
vegetative densities for final stabilization) must be inspected weekly. Rills, gullies, ruts and
other signs of erosion indicate the erosion control device is not functioning properly. Repair
and/or additional erosion control devices may be warranted.
• Material Storage Areas: Material storage areas should be located to minimize exposure
to weather and runoff. Inspections shall evaluate disturbed areas and areas used for
storing materials that are exposed to rainfall for evidence of, or the potential for, pollutants
entering the drainage system or discharging from the site. If necessary, the materials must
be covered or original covers must be repaired or supplemented. Also, protective berms
must be constructed, if needed, in order to contain runoff from material storage areas. All
state and local regulations pertaining to material storage areas will be adhered to.
• Discharge Points: All discharge points must be inspected to determine whether erosion
and sediment control measures are effective in preventing discharge of sediment from the
site or impacts to receiving waters.
BMP MAINTENANCE
The Stormwater Construction Permit requires that all erosion and sediment control practices and
other protective measures identified in the SWMP be maintained in effective operating condition,
and in accordance with good engineering, hydrologic and pollution control practices. Sediment
that has been collected by sediment controls, such as silt fence and inlet protection, shall be
removed when observed, to prevent failure of BMPs, ensure adequate BMP performance and
remove the potential of that sediment from being discharged from the site if the BMP did fail.
Removed sediment shall be properly disposed of on-site. Maintenance activities to correct
problems noted during inspections must be documented as discussed in the documentation
section, below. The inspection process must also include procedures to ensure that, when
needed, BMPs are replaced or new BMPs added to adequately manage the pollutant sources at
the site. This procedure is part of the ongoing process of revising the BMPs and the SWMP as
discussed above, and any changes to BMPs must be recorded in the SWMP. The SWMP must
be modified as soon as practicable to reflect current conditions. BMPs that have failed, or have
the potential to fail without maintenance or modifications, must be addressed as soon as possible,
immediately in most cases, to prevent the discharge of pollutants.
DOCUMENTATION
Erosion control measures and stabilizations shall be inspected at least once every 14 calendar
days. Also, post-storm event inspections must be conducted within 24 hours after the end of
precipitation event or snowmelt that could potentially cause surface erosion. The permittee must
document inspection results and maintain a record of the results for a period of three-(3) years
following closing of permit coverage. Sample inspection logs are included in Appendix G. These
records must be made available to the Owner, the City & County, the State or the EPA upon
request. The following items must be documented as part of the site inspections:
• The inspection date
• Name(s) and title(s) of personnel making the inspection
• Location(s) of discharges of sediment or other pollutants from the site
• Location(s) of BMPs that need to be maintained
• Location(s) of BMPs that failed to operate as designed or proved inadequate for a
particular location
• Location(s) where additional BMPs are needed that were not in place at the time of
inspection
• Deviations from the minimum inspection schedule as indicated above
• Description and dates of corrective actions taken including requisite changes to the
SWMP.
A complete copy of the SWMP shall be kept with the inspection and maintenance records for the
aforementioned three-(3) year period.
(Contractor to provide physical address)
REFERENCES
1. Urban Drainage and Flood Control District, Drainage Criteria Manual Volumes 1 and
2, prepared by Wright-McLaughlin Engineers, dated June 2001 (revised April 2008),
and the Volume 3, prepared by Wright-McLaughlin Engineers, dated September 1992
and revised November 2010.
2. General Permit Application and Stormwater Management Plan Preparation
Guidance, Colorado Department of Public Health and Environment (CDPHE),
Revised May 2008.
APPENDIX A – Floodplain Information
* According to FEMA FIRM Map Panels 08069C0960F and 08069C0978G, the project site
is outside the 0.2% annual chance floodplain.
1,128
188.0
2620 West Elizabeth Street
Fort Collins, Colorado
This map is a user generated static output from the City of Fort Collins FCMaps
Internet mapping site and is for reference only. Data layers that appear on this
map may or may not be accurate, current, or otherwise reliable.
City of Fort Collins - GIS
143.0
1:
WGS_1984_Web_Mercator_Auxiliary_Sphere
0 71.50 143.0 Feet
Notes
Legend
857
FEMA Floodplain
FEMA High Risk - Floodway
FEMA High Risk - 100 Year
FEMA Moderate Risk - 100 / 500 Year
FEMA Map Panel
City Floodplains
City High Risk - Floodway
City High Risk - 100 Year
City Moderate Risk - 100 Year
City Limits
APPENDIX B – Soils Information
Hydrologic Soil Group—Larimer County Area, Colorado
(2620 West Elizabeth Street)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/25/2016
Page 1 of 4
4491570 4491580 4491590 4491600 4491610 4491620 4491630 4491640 4491650 4491660 4491670
4491570 4491580 4491590 4491600 4491610 4491620 4491630 4491640 4491650 4491660 4491670
489340 489350 489360 489370 489380 489390 489400 489410 489420 489430 489440 489450 489460 489470 489480 489490
489340 489350 489360 489370 489380 489390 489400 489410 489420 489430 489440 489450 489460 489470 489480 489490
40° 34' 32'' N
105° 7' 33'' W
40° 34' 32'' N
105° 7' 26'' W
40° 34' 29'' N
105° 7' 33'' W
40° 34' 29'' N
105° 7' 26'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 35 70 140 210
Feet
0 10 20 40 60
Meters
Map Scale: 1:765 if printed on A landscape (11" x 8.5") sheet.
Warning: Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at 1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil line
placement. The maps do not show the small areas of contrasting
soils that could have been shown at a more detailed scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more accurate
calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as of
the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Larimer County Area, Colorado (CO644)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
3 Altvan-Satanta loams, 0
to 3 percent slopes
B 0.8 31.6%
4 Altvan-Satanta loams, 3
to 9 percent slopes
B 1.7 68.4%
Totals for Area of Interest 2.6 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Hydrologic Soil Group—Larimer County Area, Colorado 2620 West Elizabeth Street
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/25/2016
Page 3 of 4
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado 2620 West Elizabeth Street
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/25/2016
Page 4 of 4
APPENDIX C – Erosion and Sediment Control Escrow/Security
Calculations
Project: Disturbed Acres: 2.56
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F. 300 $2.50 $750.00
Straw Wattles (9" x 10') each 25 $20.00 $500.00
Fiber Roll per City Detail D-52 L.F. 1640 $2.00 $3,280.00
each 1 $100.00 $100.00
Rock Sock each 11 $25.00 $275.00
each 1 $200.00 $200.00
each 1 $700.00 $700.00
Sub-Total: $5,805.00
1.5 x Sub-Total: $8,707.50
Amount of security: $8,707.50
Total Acres x Price/acre: $3,456.00
$1,350.00 Sub-Total: $3,456.00
1.5 x Sub-Total: $5,184.00
Amount to Re-seed: $5,184.00
Minimum escrow amount: $3,000.00
Erosion Control Escrow: $8,707.50
User Input Fields in BLUE should be amended for this project.
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one
and one-half times the cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual
Revegetation and Stabilization Bid, whichever is greater. In no instance, will the amount of security be less than one thousand five
hundred dollars ($1,500) for residential development or three thousand dollars ($3,000) for commercial development”
Oultet Protection
Concrete Washout
(add all other BMPs for the site in this list)
Final Escrow Amount
Erosion and Sediment Control Escrow/Security Calculation
BMP Amount
Silt Fence
Vehicle Tracking Control (VTC)
Re-seeding Amount
Miniumum Escrow Amount
Elizabeth Street Farms
Unit Price of Seeding per acre:
APPENDIX D – Construction Sequence Matrix
Project: Elizabeth Street Farms Date: 12/21/2017
Municipality: City of Fort Collins
Best Management Practices (BMPs) Mobilization Demolition Grading
Utilities
Installation
Flat work
Installation
Vertical
Installation
Landscape Demobilization
Structural BMPs
Contour Furrows (Ripping/Disking)
Sediment Trap/ Filter
Vehicle Tracking Pad*
Flow Barriers (Wattles)*
Inlet Filter Bags*
Rock Bags*
Terracing
Stream Flow Diversion*
Riprap
Collecting Asphalt/Concrete Saw Cutting Waste
Vegetative BMPs
Temporary Seeding or Planting Any time the site will sit dormant longer than 30 Days.
Mulching/Sealant Any time the site will sit dormant longer than 30 Days.
Permanent Seeding or Planting
Sod Installation
Rolled Erosion Control Products (i.e., Netting/Blankets/Mats) Any time the site will sit dormant longer than 30 Days.
Other:
Construction Sequence Matrix
*All BMPs to be Removed when Final Stablization is achieved
Silt Fence Barriers*
APPENDIX E – Best Management Practice (BMP) Details
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CP-1. Construction phasing to avoid disturbing the
entire area at one time. Photo courtesy of WWE.
Description
Effective construction site management
to minimize erosion and sediment
transport includes attention to
construction phasing, scheduling, and
sequencing of land disturbing activities.
On most construction projects, erosion
and sediment controls will need to be
adjusted as the project progresses and
should be documented in the SWMP.
Construction phasing refers to
disturbing only part of a site at a time to
limit the potential for erosion from
dormant parts of a site. Grading
activities and construction are completed
and soils are effectively stabilized on one
part of a site before grading and
construction begins on another portion of the site.
Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of
land disturbing activities and the installation of erosion and sediment control practices.
Appropriate Uses
All construction projects can benefit from upfront planning to phase and sequence construction activities
to minimize the extent and duration of disturbance. Larger projects and linear construction projects may
benefit most from construction sequencing or phasing, but even small projects can benefit from
construction sequencing that minimizes the duration of disturbance.
Typically, erosion and sediment controls needed at a site will change as a site progresses through the
major phases of construction. Erosion and sediment control practices corresponding to each phase of
construction must be documented in the SWMP.
Design and Installation
BMPs appropriate to the major phases of development should be identified on construction drawings. In
some cases, it will be necessary to provide several drawings showing construction-phase BMPs placed
according to stages of development (e.g., clearing and grading, utility installation, active construction,
final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area
associated with phases of a construction project. Additionally, requirements for phased construction
drawings vary among local governments within the UDFCD boundary. Some local governments require
separate erosion and sediment control drawings for initial
BMPs, interim conditions (in active construction), and final
stabilization.
Construction Scheduling
Functions
Erosion Control Moderate
Sediment Control Moderate
Site/Material Management Yes
SM-1 Construction Phasing/Sequencing (CP)
CP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Typical construction phasing BMPs include:
Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a
100-acre subdivision might be constructed in five phases of 20 acres each.
If there is carryover of stockpiled material from one phase to the next, position carryover material in a
location easily accessible for the pending phase that will not require disturbance of stabilized areas to
access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful
planning for location of stockpiles is important.
Typical construction sequencing BMPs include:
Sequence construction activities to minimize duration of soil disturbance and exposure. For example,
when multiple utilities will occupy the same trench, schedule installation so that the trench does not
have to be closed and opened multiple times.
Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion
control blankets) as soon as feasible following grading.
Install initial erosion and sediment control practices before construction begins. Promptly install
additional BMPs for inlet protection, stabilization, etc., as construction activities are completed.
Table CP-1 provides typical sequencing of construction activities and associated BMPs.
Maintenance and Removal
When the construction schedule is altered, erosion and sediment control measures in the SWMP and
construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the
construction site. Be aware that changes in construction schedules can have significant implications for
site stabilization, particularly with regard to establishment of vegetative cover.
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-3
Urban Storm Drainage Criteria Manual Volume 3
Table CP-1. Typical Phased BMP Installation for Construction Projects
Project
Phase BMPs
Pre-
disturbance,
Site Access
Install sediment controls downgradient of access point (on paved streets this may consist
of inlet protection).
Establish vehicle tracking control at entrances to paved streets. Fence as needed.
Use construction fencing to define the boundaries of the project and limit access to areas of
the site that are not to be disturbed.
Note: it may be necessary to protect inlets in the general vicinity of the site, even if not
downgradient, if there is a possibility that sediment tracked from the site could contribute
to the inlets.
Site Clearing
and Grubbing
Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles,
etc).
Limit disturbance to those areas planned for disturbance and protect undisturbed areas
within the site (construction fence, flagging, etc).
Preserve vegetative buffer at site perimeter.
Create stabilized staging area.
Locate portable toilets on flat surfaces away from drainage paths. Stake in areas
susceptible to high winds.
Construct concrete washout area and provide signage.
Establish waste disposal areas.
Install sediment basins.
Create dirt perimeter berms and/or brush barriers during grubbing and clearing.
Separate and stockpile topsoil, leave roughened and/or cover.
Protect stockpiles with perimeter control BMPs. Stockpiles should be located away from
drainage paths and should be accessed from the upgradient side so that perimeter controls
can remain in place on the downgradient side. Use erosion control blankets, temporary
seeding, and/or mulch for stockpiles that will be inactive for an extended period.
Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary
revegetation for areas of the site that have been disturbed but that will be inactive for an
extended period.
Water to minimize dust but not to the point that watering creates runoff.
SM-1 Construction Phasing/Sequencing (CP)
CP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Project
Phase BMPs
Utility And
Infrastructure
Installation
In Addition to the Above BMPs:
Close trench as soon as possible (generally at the end of the day).
Use rough-cut street control or apply road base for streets that will not be promptly paved.
Provide inlet protection as streets are paved and inlets are constructed.
Protect and repair BMPs, as necessary.
Perform street sweeping as needed.
Building
Construction
In Addition to the Above BMPs:
Implement materials management and good housekeeping practices for home building
activities.
Use perimeter controls for temporary stockpiles from foundation excavations.
For lots adjacent to streets, lot-line perimeter controls may be necessary at the back of
curb.
Final Grading
In Addition to the Above BMPs:
Remove excess or waste materials.
Remove stored materials.
Final
Stabilization
In Addition to the Above BMPs:
Seed and mulch/tackify.
Seed and install blankets on steep slopes.
Remove all temporary BMPs when site has reached final stabilization.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-1. Silt fence creates a sediment barrier, forcing
sheet flow runoff to evaporate or infiltrate.
Description
A silt fence is a woven geotextile fabric
attached to wooden posts and trenched
into the ground. It is designed as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
A silt fence can be used where runoff is
conveyed from a disturbed area as sheet
flow. Silt fence is not designed to
receive concentrated flow or to be used
as a filter fabric. Typical uses include:
Down slope of a disturbed area to
accept sheet flow.
Along the perimeter of a receiving
water such as a stream, pond or
wetland.
At the perimeter of a construction site.
Design and Installation
Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum
recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter
control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive conditions parallel to the silt fence.
See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the
fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled
out by hand and there should be no gaps between the ground and the fabric.
Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and
other specifications in the design details. Improper installation
of silt fence is a common reason for silt fence failure; however,
when properly installed and used for the appropriate purposes, it
can be highly effective.
Silt Fence
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-1 Silt Fence (SF)
SF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-2. When silt fence is not installed along
the contour, a "J-hook" installation may be appropriate
to ensure that the BMP does not create concentrated
flow parallel to the silt fence. Photo courtesy of Tom
Gore.
Maintenance and Removal
Inspection of silt fence includes observing the
material for tears or holes and checking for slumping
fence and undercut areas bypassing flows. Repair of
silt fence typically involves replacing the damaged
section with a new section. Sediment accumulated
behind silt fence should be removed, as needed to
maintain BMP effectiveness, typically before it
reaches a depth of 6 inches.
Silt fence may be removed when the upstream area
has reached final stabilization.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-3
Urban Storm Drainage Criteria Manual Volume 3
SC-1 Silt Fence (SF)
SF-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-1. A vehicle tracking control pad constructed with
properly sized rock reduces off-site sediment tracking.
Description
Vehicle tracking controls provide
stabilized construction site access where
vehicles exit the site onto paved public
roads. An effective vehicle tracking
control helps remove sediment (mud or
dirt) from vehicles, reducing tracking onto
the paved surface.
Appropriate Uses
Implement a stabilized construction
entrance or vehicle tracking control where
frequent heavy vehicle traffic exits the
construction site onto a paved roadway. An
effective vehicle tracking control is
particularly important during the following conditions:
Wet weather periods when mud is easily tracked off site.
During dry weather periods where dust is a concern.
When poorly drained, clayey soils are present on site.
Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at
particularly muddy sites.
Design and Installation
Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control
towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction
vehicles to the designated exit through the vehicle tracking control. There are several different types of
stabilized construction entrances including:
VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the most common vehicle tracking control, and when properly maintained can be
effective at removing sediment from vehicle tires.
VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over
vegetated areas. Although this application does not typically remove sediment from vehicles, it helps
protect existing vegetation and provides a stabilized entrance.
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-4 Vehicle Tracking Control (VTC)
VTC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-2. A vehicle tracking control pad with wheel wash
facility. Photo courtesy of Tom Gore.
VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar
to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as
hand-held power washing equipment to more advance proprietary systems. When a wheel wash is
provided, it is important to direct wash water to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenance and Removal
Inspect the area for degradation and
replace aggregate or material used for a
stabilized entrance/exit as needed. If the
area becomes clogged and ponds water,
remove and dispose of excess sediment
or replace material with a fresh layer of
aggregate as necessary.
With aggregate vehicle tracking controls,
ensure rock and debris from this area do
not enter the public right-of-way.
Remove sediment that is tracked onto the
public right of way daily or more
frequently as needed. Excess sediment
in the roadway indicates that the
stabilized construction entrance needs
maintenance.
Ensure that drainage ditches at the
entrance/exit area remain clear.
A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to
discharge. Also inspect channels conveying the water from the wash area to the sediment trap and
stabilize areas that may be eroding.
When a construction entrance/exit is removed, excess sediment from the aggregate should be removed
and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface
following removal, typically by paving.
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
August 2013 Urban Drainage and Flood Control District IP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph IP-1. Inlet protection for a curb opening inlet.
Description
Inlet protection consists of permeable
barriers installed around an inlet to
filter runoff and remove sediment prior
to entering a storm drain inlet. Inlet
protection can be constructed from rock
socks, sediment control logs, silt fence,
block and rock socks, or other materials
approved by the local jurisdiction.
Area inlets can also be protected by
over-excavating around the inlet to
form a sediment trap.
Appropriate Uses
Install protection at storm sewer inlets
that are operable during construction.
Consider the potential for tracked-out
sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets
must be protected. This may include inlets in the general proximity of the construction area, not limited
to downgradient inlets. Inlet protection is not a stand-alone BMP and should be used in conjunction with
other upgradient BMPs.
Design and Installation
To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the
inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet
to function without completely blocking flows into the inlet in a manner that causes localized flooding.
When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump
or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other
site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter
along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a
curb and gutter setting, but are effective area inlet protection measures.
Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary
products are available for inlet protection that may be approved for use by local governments. If
proprietary products are used, design details and installation procedures from the manufacturer must be
followed. Regardless of the type of inlet protection selected, inlet protection is most effective when
combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier
before runoff enters the storm sewer or receiving water.
Design details with notes are provided for these forms of inlet
protection:
IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade
Inlets
IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade
Inlets
Inlet Protection
(various forms)
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-6 Inlet Protection (IP)
IP-2 Urban Drainage and Flood Control District August 2013
Urban Storm Drainage Criteria Manual Volume 3
IP-3. Rock Sock Inlet Protection for Sump/Area Inlet
IP-4. Silt Fence Inlet Protection for Sump/Area Inlet
IP-5. Over-excavation Inlet Protection
IP-6. Straw Bale Inlet Protection for Sump/Area Inlet
CIP-1. Culvert Inlet Protection
Propriety inlet protection devices should be installed in accordance with manufacturer specifications.
More information is provided below on selecting inlet protection for sump and on-grade locations.
Inlets Located in a Sump
When applying inlet protection in sump conditions, it is important that the inlet continue to function
during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower
than the top of the curb opening to allow overflow into the inlet during larger storms without excessive
localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter
becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing
localized flooding, public safety issues, and downstream erosion and damage from bypassed flows.
Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and
rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and
stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary
products providing equivalent functions.
Inlets Located on a Slope
For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended
in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads,
also see the Check Dam Fact Sheet.
Maintenance and Removal
Inspect inlet protection frequently. Inspection and maintenance guidance includes:
Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents
of the BMP (e.g., gravel) washing into the inlet.
Check for improper installation resulting in untreated flows bypassing the BMP and directly entering
the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been
properly trenched around the inlet can result in flows under the silt fence and directly into the inlet.
Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following
larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also
crush or displace the BMP.
Monitor sediment accumulation upgradient of the inlet protection.
Inlet Protection (IP) SC-6
August 2013 Urban Drainage and Flood Control District IP-3
Urban Storm Drainage Criteria Manual Volume 3
Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain
BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet
protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches.
Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain
the functionality of the BMP.
Propriety inlet protection devices should be inspected and maintained in accordance with
manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed
in a timely manner to prevent devices from breaking and spilling sediment into the storm drain.
Inlet protection must be removed and properly disposed of when the drainage area for the inlet has
reached final stabilization.
SC-6 Inlet Protection (IP)
IP-4 Urban Drainage and Flood Control District August 2013
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
August 2013 Urban Drainage and Flood Control District IP-5
Urban Storm Drainage Criteria Manual Volume 3
SC-6 Inlet Protection (IP)
IP-6 Urban Drainage and Flood Control District August 2013
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
August 2013 Urban Drainage and Flood Control District IP-7
Urban Storm Drainage Criteria Manual Volume 3
SC-6 Inlet Protection (IP)
IP-8 Urban Drainage and Flood Control District August 2013
Urban Storm Drainage Criteria Manual Volume 3
Rock Sock (RS) SC-5
November 2010 Urban Drainage and Flood Control District RS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RS-1. Rock socks placed at regular intervals in a curb
line can help reduce sediment loading to storm sewer inlets. Rock
socks can also be used as perimeter controls.
Description
A rock sock is constructed of gravel
that has been wrapped by wire mesh or
a geotextile to form an elongated
cylindrical filter. Rock socks are
typically used either as a perimeter
control or as part of inlet protection.
When placed at angles in the curb line,
rock socks are typically referred to as
curb socks. Rock socks are intended to
trap sediment from stormwater runoff
that flows onto roadways as a result of
construction activities.
Appropriate Uses
Rock socks can be used at the perimeter
of a disturbed area to control localized
sediment loading. A benefit of rock
socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the
ground; therefore, they are often used on roadway construction projects where paved surfaces are present.
Use rock socks in inlet protection applications when the construction of a roadway is substantially
complete and the roadway has been directly connected to a receiving storm system.
Design and Installation
When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per
100 lineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and
a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail
RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are
used for inlet protection and in the curb line.
When placed in the gutter adjacent to a curb, rock socks should protrude no more than two feet from the
curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert
drivers and street maintenance workers of their presence.
Maintenance and Removal
Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for
damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to
maintain the functionality of the BMP, typically when sediment
has accumulated behind the rock sock to one-half of the sock's
height.
Once upstream stabilization is complete, rock socks and
accumulated sediment should be removed and properly disposed.
Rock Sock
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-5 Rock Sock (RS)
RS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rock Sock (RS) SC-5
November 2010 Urban Drainage and Flood Control District RS-3
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a
perimeter control around a soil stockpile; and, 2) as a "J-hook"
perimeter control at the corner of a construction site.
Description
A sediment control log is a linear roll
made of natural materials such as
straw, coconut fiber, or other fibrous
material trenched into the ground and
held with a wooden stake. Sediment
control logs are also often referred to
as "straw wattles." They are used as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
Sediment control logs can be used in
the following applications to trap
sediment:
As perimeter control for stockpiles
and the site.
As part of inlet protection designs.
As check dams in small drainage
ditches. (Sediment control logs
are not intended for use in
channels with high flow
velocities.)
On disturbed slopes to shorten flow
lengths (as an erosion control).
As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland.
Sediment control logs work well in combination with other layers of erosion and sediment controls.
Design and Installation
Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum
allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to sediment control logs installed along the contour. When installed for other uses, such as
perimeter control, it should be installed in a way that will not
produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and
evaporate or infiltrate in multiple areas rather than concentrate
and cause erosive conditions parallel to the BMP.
Sediment Control Log
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management No
SC-2 Sediment Control Log (SCL)
SCL-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become
a barrier and should be installed is if they are impermeable.
Design details and notes for sediment control logs are provided in Detail SCL-1. Sediment logs must be
properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When
installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to
flow).
Improper installation can lead to poor performance. Be sure that sediment control logs are properly
trenched, anchored and tightly jointed.
Maintenance and Removal
Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the
depth is one-half the height of the sediment log and repair damage to the sediment log, typically by
replacing the damaged section.
Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath
the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may
occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as
permanent slope breaks). However, removal of sediment control logs after final stabilization is typically
recommended when used in perimeter control, inlet protection and check dam applications.
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-3
Urban Storm Drainage Criteria Manual Volume 3
SC-2 Sediment Control Log (SCL)
SCL-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-5
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs GH-1 and GH-2. Proper materials
storage and secondary containment for fuel tanks
are important good housekeeping practices. Photos
courtesy of CDOT and City of Aurora.
Description
Implement construction site good housekeeping practices to
prevent pollution associated with solid, liquid and hazardous
construction-related materials and wastes. Stormwater
Management Plans (SWMPs) should clearly specify BMPs
including these good housekeeping practices:
Provide for waste management.
Establish proper building material staging areas.
Designate paint and concrete washout areas.
Establish proper equipment/vehicle fueling and
maintenance practices.
Control equipment/vehicle washing and allowable non-
stormwater discharges.
Develop a spill prevention and response plan.
Acknowledgement: This Fact Sheet is based directly on
EPA guidance provided in Developing Your Stormwater
Pollution Prevent Plan (EPA 2007).
Appropriate Uses
Good housekeeping practices are necessary at all construction sites.
Design and Installation
The following principles and actions should be addressed in SWMPs:
Provide for Waste Management. Implement management procedures and practices to prevent or
reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the site. Practices such as trash disposal, recycling, proper material handling,
and cleanup measures can reduce the potential for stormwater runoff to pick up construction site
wastes and discharge them to surface waters. Implement a comprehensive set of waste-management
practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides,
wood preservatives, acids, roofing tar, and other materials. Practices should include storage,
handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be
considered include:
Solid or Construction Waste
o Designate trash and bulk waste-collection areas on-
site.
Good Housekeeping
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-3 Good Housekeeping Practices (GH)
GH-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GH-3. Locate portable toilet facilities on level
surfaces away from waterways and storm drains. Photo
courtesy of WWE.
o Recycle materials whenever possible (e.g., paper, wood, concrete, oil).
o Segregate and provide proper disposal options for hazardous material wastes.
o Clean up litter and debris from the construction site daily.
o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-
collection areas (dumpsters, and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges.
o Empty waste containers before they are full and overflowing.
Sanitary and Septic Waste
o Provide convenient, well-maintained, and properly located toilet facilities on-site.
o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintain clean restroom facilities and empty portable toilets regularly.
o Where possible, provide secondary containment pans under portable toilets.
o Provide tie-downs or stake-downs for portable toilets.
o Educate employees, subcontractors, and suppliers on locations of facilities.
o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
o Inspect facilities for leaks. If found, repair or replace immediately.
o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are
not spilled on the ground.
Hazardous Materials and Wastes
o Develop and implement employee and
subcontractor education, as needed, on
hazardous and toxic waste handling,
storage, disposal, and cleanup.
o Designate hazardous waste-collection
areas on-site.
o Place all hazardous and toxic material
wastes in secondary containment.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-3
Urban Storm Drainage Criteria Manual Volume 3
o Hazardous waste containers should be inspected to ensure that all containers are labeled properly
and that no leaks are present.
Establish Proper Building Material Handling and Staging Areas. The SWMP should include
comprehensive handling and management procedures for building materials, especially those that are
hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building
materials that have the potential to contaminate stormwater should be stored indoors or under cover
whenever possible or in areas with secondary containment. Secondary containment measures prevent
a spill from spreading across the site and may include dikes, berms, curbing, or other containment
methods. Secondary containment techniques should also ensure the protection of groundwater.
Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and
other potential pollutants. Designated staging areas enable easier monitoring of the use of materials
and clean up of spills. Training employees and subcontractors is essential to the success of this
pollution prevention principle. Consider the following specific materials handling and staging
practices:
o Train employees and subcontractors in proper handling and storage practices.
o Clearly designate site areas for staging and storage with signs and on construction drawings.
Staging areas should be located in areas central to the construction site. Segment the staging area
into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits
should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle
tracking controls (See Vehicle Tracking Control Fact Sheet).
o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC)
requirements and plans and provide cover and impermeable perimeter control, as necessary, for
hazardous materials and contaminated soils that must be stored on site.
o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation
failure, or other signs of deterioration and tested for soundness.
o Reuse and recycle construction materials when possible.
Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout
facilities at their own plants or dispatch facilities when feasible; however, concrete washout
commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on-
site, designate specific washout areas and design facilities to handle anticipated washout water.
Washout areas should also be provided for paint and stucco operations. Because washout areas can
be a source of pollutants from leaks or spills, care must be taken with regard to their placement and
proper use. See the Concrete Washout Area Fact Sheet for detailed guidance.
Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint,
and stucco work are occurring on large portions of the site. Be sure to check for evidence that
contractors are using the washout areas and not dumping materials onto the ground or into drainage
facilities. If the washout areas are not being used regularly, consider posting additional signage,
relocating the facilities to more convenient locations, or providing training to workers and
contractors.
When concrete, paint, or stucco is part of the construction process, consider these practices which will
help prevent contamination of stormwater. Include the locations of these areas and the maintenance
and inspection procedures in the SWMP.
MM-3 Good Housekeeping Practices (GH)
GH-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained
areas, or streams. Only use designated washout areas.
o Establish washout areas and advertise their locations with signs. Ensure that signage remains in
good repair.
o Provide adequate containment for the amount of wash water that will be used.
o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be
removed.
o Dispose of materials properly. The preferred method is to allow the water to evaporate and to
recycle the hardened concrete. Full service companies may provide dewatering services and
should dispose of wastewater properly. Concrete wash water can be highly polluted. It should
not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system without first receiving written permission from the system operator.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly
designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should
have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and
maintenance activities in a covered area. Consider the following practices to help prevent the
discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the
locations of designated fueling and maintenance areas and inspection and maintenance procedures in
the SWMP.
o Train employees and subcontractors in proper fueling procedures (stay with vehicles during
fueling, proper use of pumps, emergency shutoff valves, etc.).
o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service
problems.
o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses
to prevent stormwater run-on and runoff.
o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids.
o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and
recycle fluids whenever possible.
Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement
practices to prevent contamination of surface and groundwater from equipment and vehicle wash
water. Representative practices include:
o Educate employees and subcontractors on proper washing procedures.
o Use off-site washing facilities, when available.
o Clearly mark the washing areas and inform workers that all washing must occur in this area.
o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain
separation from drainage paths and waterbodies.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-5
Urban Storm Drainage Criteria Manual Volume 3
o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can
remove most dirt adequately.
o Do not conduct other activities, such as vehicle repairs, in the wash area.
o Include the location of the washing facilities and the inspection and maintenance procedures in
the SWMP.
Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be
identified in the SWMP. Representative procedures include identifying ways to reduce the chance of
spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by
spills, and train personnel responsible for spill prevention and response. The plan should also specify
material handling procedures and storage requirements and ensure that clear and concise spill cleanup
procedures are provided and posted for areas in which spills may potentially occur. When developing
a spill prevention plan, include the following:
o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface
waterbodies on or near the site, and measures to stop spills from leaving the site.
o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data
Sheets (MSDSs) for chemical used on site with the SWMP.
o Establish an education program for employees and subcontractors on the potential hazards to
humans and the environment from spills and leaks.
o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or
municipal sewage treatment facilities to request assistance. Emergency procedures and contact
numbers should be provided in the SWMP and posted at storage locations.
o Describe the procedures, equipment and materials for immediate cleanup of spills and proper
disposal.
o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill
prevention plan and clean up materials as changes occur to the types of chemicals stored and used
at the facility.
MM-3 Good Housekeeping Practices (GH)
GH-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Spill Prevention, Control, and Countermeasure (SPCC) Plan
Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and
implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks.
The facility is subject to this rule if it is a non-transportation-related facility that:
Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity
greater than 42,000 gallons.
Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters
of the United States and adjoining shorelines.
Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan.
To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm.
Reporting Oil Spills
In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for
assistance, or for more details, visit their website: www.nrc.uscg.mil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designation of personnel
responsible for supervising and implementing good housekeeping programs, such as site cleanup and
disposal of trash and debris, hazardous material management and disposal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in good housekeeping efforts.
Staging and storage areas require permanent stabilization when the areas are no longer being used for
construction-related activities.
Construction-related materials, debris and waste must be removed from the construction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Details:
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracking Control
Design details are not necessary for other good housekeeping practices; however, be sure to designate
where specific practices will occur on the appropriate construction drawings.
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SP-1. A topsoil stockpile that has been partially
revegetated and is protected by silt fence perimeter control.
Description
Stockpile management includes
measures to minimize erosion and
sediment transport from soil stockpiles.
Appropriate Uses
Stockpile management should be used
when soils or other erodible materials
are stored at the construction site.
Special attention should be given to
stockpiles in close proximity to natural
or manmade storm systems.
Design and Installation
Locate stockpiles away from all drainage system components including storm sewer inlets. Where
practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the
phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such
as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance
on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a
stabilized designated access point on the upgradient side of the stockpile.
Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control
blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should
be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14
days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited
time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are
"typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that
may be more prescriptive.
Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to
space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all
inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be
protected.
Maintenance and Removal
Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets.
Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be
necessary.
When temporary removal of a perimeter BMP is necessary
to access a stockpile, ensure BMPs are reinstalled in
accordance with their respective design detail section.
Stockpile Management
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management Yes
MM-2 Stockpile Management (SM)
SP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise
stabilize the ground surface where the stockpile was located.
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-3
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-5
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CWA-1. Example of concrete washout area. Note gravel
tracking pad for access and sign.
Description
Concrete waste management involves
designating and properly managing a
specific area of the construction site as a
concrete washout area. A concrete
washout area can be created using one of
several approaches designed to receive
wash water from washing of tools and
concrete mixer chutes, liquid concrete
waste from dump trucks, mobile batch
mixers, or pump trucks. Three basic
approaches are available: excavation of a
pit in the ground, use of an above ground
storage area, or use of prefabricated haul-
away concrete washout containers.
Surface discharges of concrete washout
water from construction sites are prohibited.
Appropriate Uses
Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid
concrete waste from onsite concrete mixing or concrete delivery.
Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete
washout, the soil must have adequate buffering capacity to result in protection of state groundwater
standards; otherwise, a liner/containment must be used. The following management practices are
recommended to prevent an impact from unlined pits to groundwater:
The use of the washout site should be temporary (less than 1 year), and
The washout site should be not be located in an area where shallow groundwater may be present, such
as near natural drainages, springs, or wetlands.
Design and Installation
Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface
waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the
ground, commercially manufactured prefabricated washout containers, or aboveground holding areas
constructed of berms, sandbags or straw bales with a plastic liner.
Although unlined washout areas may be used, lined pits may be required to protect groundwater under
certain conditions.
Do not locate an unlined washout area within 400 feet
of any natural drainage pathway or waterbody or
within 1,000 feet of any wells or drinking water
sources. Even for lined concrete washouts, it is
advisable to locate the facility away from waterbodies
and drainage paths. If site constraints make these
Concrete Washout Area
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-1 Concrete Washout Area (CWA)
CWA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an
impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated
concrete washout devices or a lined aboveground storage area should be used.
Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage
areas. Pre-fabricated concrete washout container information can be obtained from vendors.
Maintenance and Removal
A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying
the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is being used, as opposed to
washout in non-designated areas of the site.
Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to
about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal
location.
Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any
contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash
water is allowed to evaporate and the concrete hardens, it may be recycled.
Photograph CWA-3. Earthen concrete washout. Photo
courtesy of CDOT.
Photograph CWA-2. Prefabricated concrete washout. Photo
courtesy of CDOT.
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-3
Urban Storm Drainage Criteria Manual Volume 3
MM-1 Concrete Washout Area (CWA)
CWA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SSA-1. Example of a staging area with a gravel surface to
prevent mud tracking and reduce runoff. Photo courtesy of Douglas
County.
Description
A stabilized staging area is a clearly
designated area where construction
equipment and vehicles, stockpiles, waste
bins, and other construction-related
materials are stored. The contractor
office trailer may also be located in this
area. Depending on the size of the
construction site, more than one staging
area may be necessary.
Appropriate Uses
Most construction sites will require a
staging area, which should be clearly
designated in SWMP drawings. The layout
of the staging area may vary depending on
the type of construction activity. Staging areas located in roadways due to space constraints require
special measures to avoid materials being washed into storm inlets.
Design and Installation
Stabilized staging areas should be completed prior to other construction activities beginning on the site.
Major components of a stabilized staging area include:
Appropriate space to contain storage and provide for loading/unloading operations, as well as parking
if necessary.
A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.
Perimeter controls such as silt fence, sediment control logs, or other measures.
Construction fencing to prevent unauthorized access to construction materials.
Provisions for Good Housekeeping practices related to materials storage and disposal, as described in
the Good Housekeeping BMP Fact Sheet.
A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet,
to accommodate traffic associated with material delivery and waste disposal vehicles.
Over-sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that
required for the project. This increases costs, as well as
requirements for long-term stabilization following the
construction period. When designing the stabilized staging area,
minimize the area of disturbance to the extent practical.
Stabilized Staging Area
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material
Yes
SM-6 Stabilized Staging Area (SSA)
SSA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when
materials staging in roadways is required.
Maintenance and Removal
Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing
perimeter controls, and following good housekeeping practices.
When construction is complete, debris, unused stockpiles and materials should be recycled or properly
disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an
appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface
cover planned for the development.
Minimizing Long-Term Stabilization Requirements
Utilize off-site parking and restrict vehicle access to the site.
Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed
otherwise.
Consider use of a bermed contained area for materials and equipment that do not require a
stabilized surface.
Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise
disturbed.
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-3
Urban Storm Drainage Criteria Manual Volume 3
SM-6 Stabilized Staging Area (SSA)
SSA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Mulching (MU) EC-4
June 2012 Urban Drainage and Flood Control District MU-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph MU-1. An area that was recently seeded, mulched,
and crimped.
Description
Mulching consists of evenly applying
straw, hay, shredded wood mulch, rock,
bark or compost to disturbed soils and
securing the mulch by crimping, tackifiers,
netting or other measures. Mulching helps
reduce erosion by protecting bare soil
from rainfall impact, increasing
infiltration, and reducing runoff.
Although often applied in conjunction
with temporary or permanent seeding, it
can also be used for temporary
stabilization of areas that cannot be
reseeded due to seasonal constraints.
Mulch can be applied either using
standard mechanical dry application
methods or using hydromulching equipment
that hydraulically applies a slurry of water,
wood fiber mulch, and often a tackifier.
Appropriate Uses
Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also
be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where
growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and
tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer
than 14 days) on portions of the site not otherwise permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed
in certain jurisdictions or may not be allowed near waterways.
Do not apply mulch during windy conditions.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track
walking. Track walking should only be used where other methods are impractical because track walking
with heavy equipment typically compacts the soil.
A variety of mulches can be used effectively at construction
sites. Consider the following:
Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-4 Mulching (MU)
MU-2 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Clean, weed-free and seed-free cereal grain straw should be applied evenly at a rate of 2 tons per acre and
must be tacked or fastened by a method suitable for the condition of the site. Straw mulch must be
anchored (and not merely placed) on the surface. This can be accomplished mechanically by crimping or
with the aid of tackifiers or nets. Anchoring with a crimping implement is preferred, and is the
recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long
mulch fibers into the soil to a depth of 3 inches without cutting them. An agricultural disk, while not an
ideal substitute, may work if the disk blades are dull or blunted and set vertically; however, the frame may
have to be weighted to afford proper soil penetration.
Grass hay may be used in place of straw; however, because hay is comprised of the entire plant including
seed, mulching with hay may seed the site with non-native grass species which might in turn out-compete
the native seed. Alternatively, native species of grass hay may be purchased, but can be difficult to find
and are more expensive than straw. Purchasing and utilizing a certified weed-free straw is an easier and
less costly mulching method. When using grass hay, follow the same guidelines as for straw (provided
above).
On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory
for holding it in place. For steep slopes and special situations where greater control is needed, erosion
control blankets anchored with stakes should be used instead of mulch.
Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should
be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of
tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for
effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be
applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation
should be avoided.
Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and
steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass
or straw mulch. Normally, use of these products will be restricted to relatively small areas.
Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead
of mulch. (See the ECM/TRM BMP for more information.)
Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed
tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP
for more information on general types of tackifiers.)
Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and
allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for
temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full
coverage of exposed soil on the area it is applied.
Maintenance and Removal
After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as
needed, to cover bare areas.
Temporary and Permanent Seeding (TS/PS) EC-2
June 2012 Urban Drainage and Flood Control District TS/PS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of
Douglas County.
Description
Temporary seeding can be used to
stabilize disturbed areas that will be
inactive for an extended period.
Permanent seeding should be used to
stabilize areas at final grade that will not
be otherwise stabilized. Effective seeding
includes preparation of a seedbed,
selection of an appropriate seed mixture,
proper planting techniques, and protection
of the seeded area with mulch, geotextiles,
or other appropriate measures.
Appropriate Uses
When the soil surface is disturbed and
will remain inactive for an extended
period (typically 30 days or longer),
proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order
of two weeks), techniques such as surface roughening may be appropriate. For longer periods of
inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding
should be used on finished areas that have not been otherwise stabilized.
Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional
requirements for seeding and temporary stabilization.
Design and Installation
Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of
appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric
until plants are established.
The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding
and mulching recommendations that may be referenced to supplement this Fact Sheet.
Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where
steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand
seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot
grading can result in loss of topsoil, resulting in poor quality
subsoils at the ground surface that have low nutrient value,
little organic matter content, few soil microorganisms,
rooting restrictions, and conditions less conducive to
infiltration of precipitation. As a result, it is typically
necessary to provide stockpiled topsoil, compost, or other
Temporary and Permanent Seeding
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-2 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
soil amendments and rototill them into the soil to a depth of 6 inches or more.
Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later.
Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its
water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content.
The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across
areas that will be revegetated.
Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth
medium. Organic matter, such as well digested compost, can be added to improve soil characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil
testing, which is typically inexpensive, should be completed to determine and optimize the types and
amounts of amendments that are required.
If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding
compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement
of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth.
Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose
nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth
and conducive to plant growth. Seed-to-soil contact is the key to good germination.
Seed Mix for Temporary Vegetation
To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully
landscaped or worked for an extended period (typically 30 days or more), plant an annual grass
appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver
metropolitan area are listed in Table TS/PS-1. These are to be considered only as general
recommendations when specific design guidance for a particular site is not available. Local governments
typically specify seed mixes appropriate for their jurisdiction.
Seed Mix for Permanent Revegetation
To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should
be established. Permanent seeding should be performed promptly (typically within 14 days) after
reaching final grade. Each site will have different characteristics and a landscape professional or the local
jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a
specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth
season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended
in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding
equipment.
If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus
nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be
added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii),
plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled
upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen
for perennial grasses.
Temporary and Permanent Seeding (TS/PS) EC-2
June 2012 Urban Drainage and Flood Control District TS/PS-3
Urban Storm Drainage Criteria Manual Volume 3
Seeding dates for the highest success probability of perennial species along the Front Range are generally
in the spring from April through early May and in the fall after the first of September until the ground
freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Speciesa
(Common name)
Growth
Seasonb
Pounds of
Pure Live Seed
(PLS)/acrec
Planting
Depth
(inches)
1. Oats Cool 35 - 50 1 - 2
2. Spring wheat Cool 25 - 35 1 - 2
3. Spring barley Cool 25 - 35 1 - 2
4. Annual ryegrass Cool 10 - 15 ½
5. Millet Warm 3 - 15 ½ - ¾
6. Sudangrass Warm 5–10 ½ - ¾
7. Sorghum Warm 5–10 ½ - ¾
8. Winter wheat Cool 20–35 1 - 2
9. Winter barley Cool 20–35 1 - 2
10. Winter rye Cool 20–35 1 - 2
11. Triticale Cool 25–40 1 - 2
a Successful seeding of annual grass resulting in adequate plant growth will
usually produce enough dead-plant residue to provide protection from
wind and water erosion for an additional year. This assumes that the cover
is not disturbed or mowed closer than 8 inches.
Hydraulic seeding may be substituted for drilling only where slopes are
steeper than 3:1 or where access limitations exist. When hydraulic
seeding is used, hydraulic mulching should be applied as a separate
operation, when practical, to prevent the seeds from being encapsulated in
the mulch.
b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied,
may extend the use of cool season species during the summer months.
c Seeding rates should be doubled if seed is broadcast, or increased by 50
percent if done using a Brillion Drill or by hydraulic seeding.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-4 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Common
a
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum
'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum
'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
June 2012 Urban Drainage and Flood Control District TS/PS-5
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.)
Common
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Sandy Soil Seed Mix
Blue grama Bouteloua gracilis Warm Sod-forming
bunchgrass 825,000 0.5
Camper little bluestem Schizachyrium scoparium
'Camper' Warm Bunch 240,000 1.0
Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0
Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25
Vaughn sideoats grama Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 10.25
Heavy Clay, Rocky Foothill Seed Mix
Ephriam crested wheatgrass
d
Agropyron cristatum
'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium
'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats grama
e
Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped straw mulch. These rates should be
doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied
through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1. If
hydraulic seeding is used, hydraulic mulching should be done as a separate operation.
b
See Table TS/PS-3 for seeding dates.
c
If site is to be irrigated, the transition turf seed rates should be doubled.
d
Crested wheatgrass should not be used on slopes steeper than 6H to 1V.
e
Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-6 Urban Drainage and Flood Control District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses
(Numbers in table reference
species in Table TS/PS-1)
Perennial Grasses
Seeding Dates Warm Cool Warm Cool
January 1–March 15
March 16–April 30 4 1,2,3
May 1–May 15 4
May 16–June 30 4,5,6,7
July 1–July 15 5,6,7
July 16–August 31
September 1–September 30 8,9,10,11
October 1–December 31
Mulch
Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment
of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP
Fact Sheet for additional guidance.
Maintenance and Removal
Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed
and mulch these areas, as needed.
An area that has been permanently seeded should have a good stand of vegetation within one growing
season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of
the site that fail to germinate or remain bare after the first growing season.
Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may
also be necessary.
Protect seeded areas from construction equipment and vehicle access.
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SR-1. Surface roughening via imprinting for temporary
stabilization.
Description
Surface roughening is an erosion control
practice that involves tracking,
scarifying, imprinting, or tilling a
disturbed area to provide temporary
stabilization of disturbed areas. Surface
roughening creates variations in the soil
surface that help to minimize wind and
water erosion. Depending on the
technique used, surface roughening may
also help establish conditions favorable
to establishment of vegetation.
Appropriate Uses
Surface roughening can be used to
provide temporary stabilization of
disturbed areas, such as when
revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening
is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls.
Surface roughening is often implemented in conjunction with grading and is typically performed using
heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also
compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are
better surface roughening techniques in locations where revegetation is planned. Roughening is not
effective in very sandy soils and cannot be effectively performed in rocky soil.
Design and Installation
Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and
SR-2, respectively.
Surface roughening should be performed either after final grading or to temporarily stabilize an area
during active construction that may be inactive for a short time period. Surface roughening should create
depressions 2 to 6 inches deep and approximately 6 inches apart. The surface of exposed soil can be
roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the
contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or
tilling.
Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be
roughened as a subsequent operation. Roughening should follow along the contours of the slope. The
tracks left by truck mounted equipment working perpendicular
to the contour can leave acceptable horizontal depressions;
however, the equipment will also compact the soil.
Surface Roughening
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-1 Surface Roughening (SR)
SR-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Care should be taken not to drive vehicles or equipment over areas that have been surface roughened.
Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies.
Because surface roughening is only a temporary control, additional treatments may be necessary to
maintain the soil surface in a roughened condition.
Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not
provide long-term erosion control.
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-3
Urban Storm Drainage Criteria Manual Volume 3
EC-1 Surface Roughening (SR)
SR-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Appendix F - Colorado Discharge Permit System (CDPS) Application
COLORADO DISCHARGE PERMIT SYSTEM (CDPS)
Revised 10/2012
For Agency Use Only
Permit Number Assigned
Date Received____/____/____
Month Day Year
DISCHARGES ASSOCIATED WITH NON-CONTACT COOLING WATER APPLICATION
PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED.
Please print or type. Original signatures are required. All items must be completed accurately and in their entirety for the
application to be deemed complete. Incomplete applications will not be processed until all information is received which will
ultimately delay the issuance of a permit. If more space is required to answer any question, please attach additional sheets to the
application form. Applications must be submitted by mail or hand delivered to:
Colorado Department of Public Health and Environment
Water Quality Control Division
4300 Cherry Creek Drive South
WQCD-P-B2
Denver, Colorado 80246-1530
Any additional information that you would like the Division to consider in developing the permit should be provided with the
application. Examples include effluent data and/or modeling and planned pollutant removal strategies.
PERMIT INFORMATION
Reason for Application: NEW CERT
RENEW CERT EXISTING CERT #____________________
Applicant is: Property Owner Contractor/Operator
A. Contact Information
Permittee (If more than one please add additional pages)
Organization Formal Name: ___________________________________________________________
1. Permittee the person authorized to sign and certify the permit application. This person receives all permit
correspondences and is legally responsible for compliance with the permit.
Responsible Position (Title): ______________________________________________________________
Currently Held By (Person): _______________________________________________________________
Telephone No:__________________________________________________________________________
email address__________________________________________________________________________
Organization: ___________________________________________________________________________
Mailing Address: ________________________________________________________________________
City:_______________________________ State: ______________________ Zip: ____________________
This form must be signed by the Permittee to be considered complete.
Per Regulation 61: In all cases the permit application shall be signed as follows:
a) In the case of corporations, by a responsible corporate officer. For the purposes of this section, the
responsible corporate officer is responsible for the overall operation of the facility from which the discharge
described in the application originates.
b) In the case of a partnership, by a general partner.
c) In the case of a sole proprietorship, by the proprietor.
d) In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking
elected official
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
2. DMR Cognizant Official (i.e. authorized agent)—the person or position authorized to sign and certify reports
required by permits including Discharge Monitoring Reports [DMR’s], Annual Reports, Compliance Schedule
submittals, and other information requested by the Division. The Division will send pre-printed reports (e.g. DMR’s) to
this person. If more than one, please add additional pages.
Same as Permittee—Item 1
Responsible Position (Title): _______________________________________________________
Currently Held By (Person): ________________________________________________________
Telephone No:___________________________________________________________________
Email address____________________________________________________________________
Organization: ____________________________________________________________________
Mailing Address: _________________________________________________________________
City:______________________________ State: ______________ Zip: ______________________
Per Regulation 61: All reports required by permits, and other information requested by the Division shall be
signed by the permittee or by a duly authorized representative of that person. A person is a duly authorized
representative only if:
(i) The authorization is made in writing by the permittee;
(ii) The authorization specifies either an individual or a position having responsibility for the overall operation of
the regulated facility or activity such as the position of plant manager, operator of a well or a well field,
superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for
environmental matters for the company. (A duly authorized representative may thus be either a named
individual or any individual occupying a named position); and
(iii) The written authorization is submitted to the Division.
3. Site/Local Contact—contact for questions regarding the facility & discharges authorized by this permit
Same as Permittee—Item 1
Responsible Position (Title): ________________________________________________________
Currently Held By (Person): _________________________________________________________
Telephone No:____________________________________________________________________
Email address_____________________________________________________________________
Organization: _____________________________________________________________________
Mailing Address: __________________________________________________________________
City:______________________________ State: ______________ Zip: _______________________
4. Operator in Responsible Charge Same as Permittee—Item 1
Responsible Position (Title): __________________________________________________________
Currently Held By (Person): ___________________________________________________________
Telephone No:______________________________________________________________________
Email address______________________________________________________________________
Organization: _______________________________________________________________________
Mailing Address: ____________________________________________________________________
City:_______________________________ State: ______________ Zip: ________________________
Certification Type____________________Certification Number________________________________
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
5. Billing Contact (if different than the permittee)
Responsible Position (Title): _____________________________________________________________
Currently Held By (Person): ______________________________________________________________
Telephone No:_________________________________________________________________________
Email address_________________________________________________________________________
Organization: __________________________________________________________________________
Mailing Address: _______________________________________________________________________
City:______________________________ State: ______________ Zip: ____________________________
6. Other Contact Types (check below) Add pages if necessary:
Responsible Position (Title): ______________________________________________________________
Currently Held By (Person): _______________________________________________________________
Telephone No:__________________________________________________________________________
Email address__________________________________________________________________________
Organization: ___________________________________________________________________________
Mailing Address: ________________________________________________________________________
City:______________________________________ State: ______________ Zip: _____________________
Pretreatment Coordinator
Environmental Contact
Biosolids Responsible Party
Property Owner
Inspection Facility Contact
Consultant
Compliance Contact
Stormwater MS4 Responsible
Person
Stormwater Authorized
Representative
Other ____________________
B. Permitted Project/Facility Information
1. Project/Facility Name ____________________________________________________________________________
Street Address or cross streets_____________________________________________________________________
City, State and Zip Code _____________________________________________County _____________________
Type of Facility Ownership
City Government Corporation Private Municipal or Water District
State Government Mixed Ownership _________________________________
Legal Description
Directions from nearest major cross streets
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
B. Permitted Project/Facility Information continued
2. Facility Latitude/Longitude—List the latitude and longitude of the excavation(s) resulting in the discharge(s). If the exact excavation
location(s) are not known, list the latitude and longitude of the center point project. If using the center point, be
sure to specify that it is the center point of activity.
001A Latitude __________ . _________ Longitude ___________ . _____________ (e.g., 39.703°, 104.933°’)
degrees (to 3 decimal places) degrees (to 3 decimal places)
or
001A Latitude _____ º _____’ _____" Longitude _____ º _____’ _____" (e.g., 39°46'11"N, 104°53'11"W)
degrees minutes seconds degrees minutes seconds
Horizontal Collection Method: GPS Unspecified Interpolation Map – Map Scale Number__________
Reference Point: Project/Facility Entrance Project/Facility Center/Centroid
Horizontal Accuracy Measure (WQCD Requires use of NAD83 Datum for all references)___________________
(add additional pages if necessary)
3. Facility Activity
Standard Industrial Code (SIC Code) __________ ___________ ____________ ___________
Facility Industrial/Business Activity
Describe the primary industrial activities which take place on site. Include the type of facility (car lot, gas station parking lot,
potato processing plant, etc.) plus a brief description of the nature of the business and the industrial processes used. (The
applicant may want to submit a process flow sheet.) If this is a seasonal operation, list the months of operation. Indicate the
number of hours per day or weeks of operation:
Production: List the principal product(s) produced (if any) and maximum production rate:
C. Discharge Information
Discharge will begin (date)___________________
Estimate how long dewatering will last ____________Years _________Months ____________Days
List the Actual, total duration of the discharge only, not the duration of the project
Is this a ONE TIME Discharge YES NO
If recurring/intermittent/discontinuous, please describe expected schedule or periods of discharge.
Will the discharge go to a ditch storm sewer, or any other type of conveyance? YES NO
If YES, in table below include the name of the ultimate receiving waters where the ditch discharges.
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
C. Discharge Information continued
In the table below, include the following information for the discharge: (See Instructions)
Include the number of discharge points (use a separate piece of paper if necessary)
Include the latitude and longitude of each discharge point
Include the name of the receiving stream(s)
Include the volume of water to be discharged or the estimated flow of the discharge in gallons per minute
NOTE: If a construction dewatering permit is needed along with the Non-contact cooling water discharge permit
for work on the same facility such as construction dewatering permit for the construction of an underground parking
structure and the minimal discharge permit for the sump to dewater the facility once construction is complete, one
permit may be issued for both. If both permits are needed, list the construction dewatering discharge as
discharge point 001. List the other discharge (minimal discharge) as discharge point 002
OUTFALL
NUMBER
Latitude
Degrees/Minutes/Seconds
Longitude
-Degrees/Minutes/Seconds
Receiving Stream Volume/Flow
001
002
003
Sampling and Reporting Requirements: Sampling must occur at every end-of-pipe dewatering location (after going through your choice of BMP, if
necessary), as required. Discharge Monitoring Reports (DMRs) must be submitted to the Division monthly. The sampling results must be maintained
on the construction site.
.
D. Site Specific Information
Chemical treatment: Will any chemical additives or other materials be used in the water or to treat water prior to discharge? If YES,
list here and include the Material Safety Data Sheet (MSDS) with the application List here those chemicals or materials added to the
water prior to, during, and after the water is used and prior to discharge. Also list chemicals or materials used in the treatment of the
wastewaters. This includes but is not limited to soaps, surfactants, conditioners, flocculants, biocides, acids, or bases.
Chemical Name* Manufacturer Purpose In Which Waste Stream?
If the chemical formula is unknown or confidential, provide the manufacturer’s name, contact person, address, and phone number or
a copy of the manufacturer’s brochure, product label information or materials handling data sheet for each product used. Please list
the major constituents or active ingredients if known.
Used or manufactured toxics: The applicant must provide a list of any toxic products which the applicant currently uses or
manufactures as an intermediate or final product or by product List those toxic products that are used in the manufacturing process
or are produced by the manufacturing process. In the case of root crop washing, any chemical listed in Appendix A that the grower is
known to use in the growing of these crops is to be listed in this section. Do not include those substances .
Flow measurement: What method of flow measurement will be used for each discharge point (e.g., v notch weir, pump capacity,
parshall flume, etc.)? Designate whether currently installed or proposed. Identify the minimum and maximum flow measurement
capability
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
D. Site Specific Information (cont.)
Improvements: Please provide a description of any construction, upgrading or operation of waste treatment equipment. Also include
here a description of any changes to the facility since the previous permit renewal. (List any improvements to the wastewater
treatment system which are required or which are being undertaken to ensure future compliance with environmental regulations )
Is or will land application of any wastewater be practiced? If YES Briefly describe the process wastewater to the effluent for each
outfall including process wastewater, cooling waters, domestic wastewater and storm‐water runoff; the average, maximum
and design flow which each process contributes; and a description of the treatment the wastewater receives including the
ultimate disposal of any solid or fluid wastes other than by discharge. Processes, operations or production areas may be
described in general terms. The average flow of point sources composed of stormwater may be estimated.
Use additional pages as needed.
Outfall
Number
Wastewater
Source
Treatment Used Average Flow
gpm*
Design Flow
gpm**
Daily
Maximum
Flow gpm
If land application, defined as any discharge being applied to the land for treatment or disposal purposes, is practiced or proposed
the Division needs appropriate information to make a judgement as to possible impact on ground or surface waters. If not identified
elsewhere, identify the nearest surface waters or dry stream bed.
Discharge Quality: Analytical data for the following parameters, may be required by the permit drafter in order to complete the
certification properly, and if so shall be submitted from at least one grab sampling of each discharge point. If this information is
required, the legal contact will be contacted and said data will be requested. Do not perform and submit data for the parameters
listed below unless requested by the Division or unless data from analyses are already available and permittee wishes to include
this information with the application.
These items may be required monitoring for various pollutants. If required, in item 22, analysis for the
indicated parameters shall be performed on each outfall. In the case of sedimentation ponds for
stormwater runoff, one outfall can be sampled if it can reasonably be assumed to be representative of all
sedimentation pond outfalls.
WET testing procedures are described in the Colorado Water Quality Control Division Biomonitoring
Guidance Document (July 1993) which can be obtained from the Division. The effluent sample for
analysis shall be a composite sample and proportioned according to flow. However, a minimum of one
grab sample may be taken for effluents from holding ponds or other impoundments with a retention
period greater than 24 hours. For discharges other than stormwater discharges, the Division may waive
composite sampling for any outfall for which the applicant demonstrates that the use of an automatic
sampler is infeasible and that the minimum of four (4) grab samples will be a representative sample of
the effluent being discharged. Include the sampling date and the name of the laboratory performing the
analyses. When quantitative data for a pollutant are required, the applicant must collect a sample of
effluent and analyze it for the pollutant in accordance with analytical methods approved under 40 C.F.R.
Part 136. When no analytical method is approved the applicant may use any suitable method but must
provide a description of the method. The Division may allow or establish appropriate site‐specific
sampling procedures or requirements, including sampling locations, the season in which the sampling
takes place, protocols for collecting samples and additional time for submitting data on a case‐by‐case
basis.
IT IS RECOMMENDED THAT YOU CONTACT AN ANALYTICAL LABORATORY PRIOR TO SAMPLING AND
ANALYSIS SO THAT PROPER PROCEDURES ARE FOLLOWED.
If there is no water to analyze at this time so indicate.
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
D. Site Specific Information (cont.)
Whole Effluent Toxicity Testing: If required, the WET testing shall be conducted on 100% effluent and be for both Ceriodaphnia dubia
and fathead minnows. This requirement is waived where routine testing is currently required under an existing CDPS permit. The test
shall be an acute test. The Division reserves the right to request WET testing as part of the application review process. If so required,
the permit application will not be considered complete until the additional information is submitted. Do not perform and submit data
for this parameter unless requested by the Division or unless data from analyses are already available.
Additional WET Testing: All applicants must identify any biological toxicity tests which have been performed within the last 3 years on
any of the discharges or the receiving water in relation to a discharge from this facility.
Additional monitoring: All applicants must review the parameters listed in Appendix A and Appendix B to this application, and
indicate whether they know or have reason to believe that these pollutants are present. For every pollutant expected to be
discharged, the applicant must briefly describe the reasons the pollutant is expected to be discharged, and report any
quantitative data it has for any pollutant.
The applicant must review Appendices A and B and must indicate whether it knows or has reason to
believe that any of the pollutants listed are present in its discharge. Each applicant must report
quantitative data for each outfall containing process wastewater with the following exceptions:
a.) For every pollutant discharged which is not so limited in an effluent limitations guideline, the
applicant must either report quantitative data or briefly describe the reasons the pollutant is expected to
be discharged.
b.) For every pollutant expected to be discharged in concentrations of 10 ug/L or greater the applicant
must report quantitative data. For acrolein, acrylonitrile, 2,4 dinitrophenol, and 2‐methyl‐4,6
dinitrophenol, where any of these four pollutants are expected to be discharged in concentrations of 100
ug/L or greater the applicant must report qualitative data. For every pollutant expected to be discharged
in concentrations less than 10 ug/L, or in the case of acrolein, acrylonitrile, 2,4 dinitrophenol, and 2‐
methyl‐4,6 dinitrophenol, in concentrations less than 100 ug/L, the applicant must either submit
quantitative data or describe the reasons the pollutant is expected to be discharged.
E. Location Map designating the location of the construction site and the discharge(s) to the receiving water(s)
listed in Item 5. A north arrow shall be shown. This map must be on paper 8-1/2 x 11 inches.
Site‐specific conditions:
a) Does this facility have bulk storage of diesel fuel, gasoline, solvents, fertilizers, hazardous, or toxic materials on site?
b) Is this operation located within one mile of a landfill, or any mine or mill tailings?
c) Does the dewatering area have or possibly have groundwater contamination, such as plumes from leaking
underground storage tanks, etc.?
If YES for any of these, please show location of the landfill, tailings or possible groundwater contamination on the
location map or in the site sketch. Please explain the location, extent of contamination, possible effect on the discharges
from this facility.
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
F. A Legible Sketch of the site shall be submitted and include the location of the end of pipe dewatering discharge at the site
(e.g. where the flow will be discharges from the pump of BMP), the BMP(s) that will be used to treat the discharge(s),
and the sampling location(s). Refer to the instructions for additional guidance specific to sites with multiple potential
dewatering locations. This map must be on paper 8-1/2 x 11 inches.
G. Pollution Prevention Plans: Please describe any pollution prevention or best management plans currently in place which
could result in the improvement of water quality. These could include solvent recycling programs, material
containment procedures, education, etc.
Note to the applicant: Upon review of the application, the Division may request additional discharge information, or analysis of certain parameters once
the application has been reviewed. If the Division requests a representative analysis of the water which will be discharged, the application processing
time may be lengthened.
H. Other Environmental Permits: Does this facility currently have any environmental permits or is it subject to regulation, under
any of the following programs?
Mark which of the other permits/programs the facility has obtained or is in the process of obtaining or is subject to
regulation under.
Under item .h., mark "yes" if the facility has any of the following permits:
a.) Prevention of Significant Deterioration (PSD) program under the Clean Air Act;
b.) Non‐attainment Program under the Clean Air Act; or
c.) National Emission Standards for Hazardous Pollutants (NESHAPS) under the Clean Air Act.
Permit Name Yes No Date Applied Permit Number
a) Colorado Division of Minerals and Geology (formerly MLRD)
b) Underground Injection Control
c) Dredge or Fill Permit, Section 404 (Army Corps of Engineers)
d) Resource Conservation and Recovery Act (RCRA)
e) CDPS Stormwater
f) Colorado State Air Pollution Program
g) Other
Industrial Wastewater Discharge Permit – non contact cooling water www.coloradowaterpermits.com
Revised 10/2012
I. REQUIRED FOR ALL APPLICANTS:
REQUIRED SIGNATURES:
Signature of Applicant: The applicant must be either the owner and/or operator of the construction site. Refer to Part B of the instructions for
additional information. The application must be signed by the applicant to be considered complete. In all cases, it shall be signed as
follows: (Regulation 61.4 (1ei)
a) In the case of corporations, by the responsible corporate officer is responsible for the overall operation of the facility from which
the discharge described in the form originates
b) In the case of a partnership, by a general partner.
c) In the case of a sole proprietorship, by the proprietor.
d) In the case of a municipal, state, or other public facility, by either a principal executive officer, ranking elected official, (a principal
executive officer has responsibility for the overall operation of the facility from which the discharge originates).
“I certify under penalty of law that I have personally examined and am familiar with the information submitted in this application and all
attachments and that, based on my inquiry of those individuals immediately responsible for obtaining the information, I believe that the
information is true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the
possibility of fine or imprisonment.
Signature of Legally Responsible Person (submission must include original signature) Date Signed
Name (printed) Title
In the case of permittees that intend to discharge to storm sewer systems or other conveyances, the permittee must
contact the owner of the system prior to discharge to verify local ordinances, regulations or additional requirements.
If the discharge is to private property, the permittee must to obtain permission from the land owner.
*Owners are not required to accept discharges
“I certify that I have read and understand the preceding paragraph and will comply with it by contacting the owner of the
conveyance system or owners agents prior to discharge into the system.”
Signature of Legally Responsible Person (submission must include original signature) Date Signed
Name (printed) Title
Appendix G - Sample Inspection Log
Appendix H – Site Map and Design Drawings
Erosion Control Plan | C8.0
Overall Grading | C3.0
Landscape Plan and Notes | LS1
Landscape Plan | LS2-LS3
Survey Area Data: Version 10, Sep 22, 2015
Soil map units are labeled (as space allows) for map scales 1:50,000
or larger.
Date(s) aerial images were photographed: Apr 22, 2011—Apr 28,
2011
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor shifting
of map unit boundaries may be evident.
Hydrologic Soil Group—Larimer County Area, Colorado
(2620 West Elizabeth Street)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/25/2016
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