HomeMy WebLinkAboutBLOOM OFFSITE WATER - BASIC DEVELOPMENT REVIEW - BDR220004 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER MANAGEMENT PLAN
Storm Water Management Plan
Bloom Offsite Waterline
Project Owner:
Hartford Homes
4801 Goodman Road
Timnath, Colorado 80547
Phone: (970) 674-1109
Prepared By:
Galloway & Company, Inc.
5265 Ronald Reagan Blvd., Suite 210
Johnstown, CO 80534
Contact: James Prelog, P.E.
SWMP Preparation Date: October 19, 2022
Estimated Project Dates:
Project Start Date: January 2023
Project Completion Date: March 2023
Project Owner/Developer Signature Block
I have reviewed the information contained within the Storm water 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
TABLE OF CONTENTS
SECTION 1 SITE DESCRIPTION
i. Site Location
ii. Description of Adjacent Areas
a) Nature and Purpose of Construction Activity
b) Construction Sequence of Major Activities
c) Area of Disturbance
d) Topography, Soils, and Rainfall Data
e) Existing Vegetation
f) Potential Sources of Pollution
g) Non-Stormwater Discharges
h) Receiving Waters
i) Site Features and Sensitive Areas to be Protected
j) Other Applicable Federal, State or Local Programs, Regulations or Restrictions
VICINITY MAP
SECTION 2 DESIGN DRAWINGS
SECTION 3 STORMWATER MANAGEMENT CONTROLS
a) SWMP Administrator and Important Contacts
b) Identification of Potential Pollutant Sources
c) BMPs for Storm water Pollution Prevention
d) Changes in Construction Activity and BMP Implementation
e) Hazardous Material Handling and Spill Prevention
SECTION 4 FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT
a) Final Stabilization Measures
b) Seed Mix Information
c) Final Stabilization Notes
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 – Floodplain Permit
APPENDIX I – Erosion Control Plans
SECTION 1 SITE DESCRIPTION
i. Site Location
The Bloom Offsite Wateline project is located in the northeast quarter of section 9,
township 7 north, range 68 west of the 6th P.M., City of Fort Collins, County of Larimer,
State of Colorado.
CDPS Permit #: To Be Determined
*A copy of the permit is available in Appendix F.
ii. Description of Adjacent Areas:
The project site consists of approximately 260 acres of vacant and undeveloped tract of land
that is currently being used for farming. Existing grades across the site vary from 0.5 to 3
percent. The site generally drains from north to south. There are existing train tracks across
the northern portion of the site that run diagonal from the northwest to the southeast. The
project site is located within the Cooper Slough/Boxelder Basin and the Cooper Slough
channel is located just to the west of the project site.
iii. Description of Erosion Control Phasing:
This project will be conducted in one phase. All erosion control measures will be in place for
the entirety of construction of this project.
A. NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY
The purpose of this construction activity is to prepare the site for installation of a new water
main. Typical construction activities associated with this kind of development are grubbing,
rough grading, installation of underground utility mains.
B. CONSTRUCTION SEQUENCE OF MAJOR ACTIVITIES
- Estimated project start date: January 2023
- Estimated project completion date: March 2023
Major Phases of Construction:
* Refer to Appendix D for the Construction Sequence Matrix.
* Refer to Appendix J for a copy of the site map, design drawings, erosion control phasing plan,
overall grading, and offsite flow exhibit.
- Install initial erosion and sediment controls, such as silt fence and vehicle tracking
control prior to any earth disturbing activity.
- Install utilities (e.g., domestic water)
- 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 as remediation of the site is performed following the installation of the waterline.
C. AREA OF DISTURBANCE
The total area of the site within the project boundaries is ±5.44 acres. This area falls inside of
the construction easement shown on the plan set and will be the only area disturbed for this
project.
Area estimates:
- Limit of Construction: 5.44 acres
- Total Storage/Staging Areas: 0.03 acres
- The site was covered in existing vegetative cover (native grasses and weeds). The site
was used for agriculture.
D. TOPOGRAPHY, SOILS AND RAINFALL DATA
Existing grades across the site vary from 0.5 to 3 percent. The site generally drains from north
to south.
According to the Natural Resources Conservation (NRCS) Web Soil Survey, the project site
consists of a mix of soil types and Hydrologic Soil Groups (HSG) including:
- Ascalon Sandy Loam (33%), HSG ‘B’
- Fort Collins Loam (27%), HSG ‘C’
- Garrett Loam (23%), HSG ‘B’.
This soil is associated with Hydrologic Soil Group (HSG) ‘C’. HSG ‘C’ soils have a slow
infiltration rate when thoroughly wet and 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. The remainder of the site consists of a mix of HSG ‘B’
and ‘C’ soils.
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?co3005
Impervious and Runoff Coefficients
Percentage impervious area before construction: 0%
Runoff coefficient before construction (C2): 0.20
Percentage impervious area after construction (grading): 65%
Runoff coefficient after construction (C2): 0.70
E. EXISTING VEGETATION
The site was used for agriculture. The ground cover across the existing site consists of native
grasses and weeds. The existing percent vegetation cover was very good, ±75%.
F. POTENTIAL POLLUTION SOURCES
During construction there is potential for pollution from trenching and utility construction. Most
importantly, these are earth disturbing activities. The potential for pollution arises not just from
grading and excavation but also 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. Pollution can occur when the aforementioned are
exposed to rainfall and/or runoff. The contact can contaminate the stormwater.
Additionally, there is a potential for pollution from the 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 Site Maps by the Contractor.
G. NON-STORMWATER DISCHARGES
All discharges covered by this permit shall be composed entirely of stormwater associated with
construction activity, however, there are several exceptions including uncontaminated springs,
landscape-irrigation return flow, construction dewatering, and concrete washout. The SWMP
should address the location and description of any anticipated allowable sources of non-
stormwater discharge at the site.
H. RECEIVING WATERS
There are two ultimate outfalls for the site’s drainage. One on the upper portion of the Cooper
Slough and another at the southern portion of the site along the Redman development.
The master plan for this drainage basin is currently being updated but we were able to review a
copy of the plan dated February 2021. This report is titled “City of Fort Collins Upper Cooper
Slough Basin Selected Plan of Improvements” prepared by Icon Engineering, Inc. (Master Plan).
The Cooper Slough drainage basin flow predominantly runs north to south over land uses
characterized as farmland and open space. The Cooper Slough drainage basin eventually feeds
the Cache La Poudre River. Improvements to the Cooper Slough are outside the boundaries of
this project and therefore are not a part of this project.
I. SITE FEATURES AND SENSITVE AREAS TO BE PROTECTED
There are multiple features protected on the project site, including: an existing wetland on the
west side of project site and the Cooper Slough channel is located just to the west of the project
site. The project site’s construction has minimal impact on these sensitive areas and will provide
immediate erosion control BMPs, such as silt fences, to ensure no detrimental impact is placed
on these protected areas.
J. OTHER APPLICABLE FEDERAL, STATE OR LOCAL PROGRAMS,
REGULATIONS OR RESTRICTION
No other applicable restrictions apply. We are not aware of endangered species and the site is
not designated as a historical site.
A floodplain use permit (City of Fort Collins, Section 10-27 – Appendix J) was submitted to
account for the project’s impact or change to the floodplain. We are not aware of any other
permits, however, the contractor is responsible for any further necessary or appropriate permits.
A geotechnical report prepared for Hartford Homes, on May 11, 2017 titled “PRELIMINARY
GEOTECHNICAL INVESTIGATION SPRINGER-FISCHER PROPERTY FORT COLLINS,
COLORADO” provides a figure (appendix I) displaying the depth to groundwater for the project
site.
Soil disturbance will be seen across the entirety of the limits of construction. As soil is disturbed
through rough or final grading, appropriate BMPs will be applied and maintained to reduce soil
exposure. BMPs include but are not limited to seeding, mulching, and surface roughening.
Two sensitive or riparian areas exist on the west portion of the project site. Both, the Cooper
Slough channel and the existing wetland are outside of the project site. The closest distance to
either of these two sensitive areas is 75’ and should have no impact.
SITE MAPS
Refer to Appendix J for Site Maps
Erosion Control
VICINITY MAP
Vicinity Map – Bloom Offsite Water
Not to Scale
Larimer-Weld Canal
Bloom Offsite
water
Project Site
Cooper Slough
Lake Canal
SECTION 2: DESIGN DRAWINGS
Refer to Appendix J for Design Drawings
Overall Landscape Plan
SECTION 3: STORMWATER MANAGEMENT CONTROLS
A. SWMP ADMINISTRATOR AND IMPORTANT CONTACTS
The SWMP Administrator is responsible for developing, implementing, maintaining, and revising
the SWMP. The Contractor shall designate a SWMP Administrator which will be the contact for
all SWMP related issues and the person responsible for its accuracy, completeness, and
implementation. 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 with all contractors and subcontractors involved in earth disturbing
activities to review the requirements of the Permit(s), the SWMP and address any problems that
have arisen in implementing the SWMP or maintaining the BMPs. The Contractor shall maintain
a log of all weekly meetings and document the issues addressed in the meetings.
B. IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES
Potential pollutant sources for this site include:
· Disturbed and Stored Soils: The site will be grubbed and trenched prior to major utility
construction. The site should receive temporary seeding and mulching within 7 days of
the last disturbance if no further disturbance is expected for at least 14 days. Place
sediment control BMPs. 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 construction 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: All loading and unloading operations of
equipment shall be carried out in areas protected by erosion and sediment controls. It is
recommended that all 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 all state and federal
regulations. Tanks shall have approved spill containment with the capacity required by
the applicable regulations. From NFPA 30: All tanks shall be provided with secondary
containment (i.e., containment external to and separate from primary containment).
Secondary containment shall be constructed of materials of sufficient thickness, density,
and composition so as not to be structurally weakened by contact with the fuel stored.
Secondary containment must also be 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 all EPA, OSHA and other
regulatory requirements for signage, fire extinguisher, etc. Continual maintenance of
hoses, valves, fittings, caps, filler nozzles and associated hardware is required to ensure
proper working condition at all times. 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 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, with a liner, 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.
· Non-Industrial Waste Sources:
Portable toilets: All 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 all
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.
· Non-industrial waste sources such as worker’s trash and portable toilets: The site
shall be policed at the end of each workday 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.
· Dedicated Asphalt and Concrete Batch Plants: Neither a dedicated asphalt nor a
concrete batch plant is anticipated with the proposed construction activity.
· Outdoor storage of construction materials, building materials, fertilizers and other
chemicals: Outdoor storage is anticipated for this project site. All material like wood,
shingles, tiles, siding insulation, cement, mortar, and stone are stored outside.
Chemicals are not anticipated to be left outside. All material will undergo routine
monitoring to ensure weather exposure does not cause unwanted contamination (site
management control). Tarps or other form of covering will be used to mitigate unwanted
contamination by the elements. The location of storage / management areas clearly
shown on the Site Map. Materials in outdoor storage may vary as construction
progresses and such changes shall be reflected in the live SWMP.
· Bulk storage of materials: Bulk storage shall be found in the designated outdoor
storage areas (stockpile management). Exposure to the elements may cause unwanted
contamination to stormwater. Thus, before construction, the designated storage location
must be evaluated to allow adequate space for all bulk materials. After adequate space
is acquired, additional measures are needed to ensure no unwanted contamination of
the stormwater. Such measures include trapping spills within the storage area, ensuring
at least 50 feet distance from any flow lines, a fence to prevent sedimentation escaping
or coming into the storage location, and coverings when appropriate for material.
· Fugitive dust or particulate generating processes: Earth moving activities, street
sweeping, and track-out and carry out, and bulk materials transport all result in transport
of particulates. Reasonable precautions must be taken to mitigate offsite transport of
atmospheric pollution. The project will follow all required “BMPs” articulated in the
Fugitive Dust Manual and at least one additional BMP included during each of the
identified activities in accordance with City Ordinance No. 044, 2016. In addition, a copy
of the Dust Control Manual shall always be kept in the trailer during construction.
Activities will include watering the site, covering trucks, slower site speeds, and vehicle
tracking units.
· Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents, and oils: Contamination from these materials is hazardous to the community
and to the local wildlife. Thus, due care and monitoring is required for said materials.
Healthy vegetation requires the use of fertilizers and pesticides. Application and timing
will take heed to weather and regulations to mitigate potential contamination of
stormwater due to fertilizer and pesticide’s solubility. Application cannot happen if
weather dictates precipitation on the day of application or the next day. In addition, these
materials will not be stored onsite unless covered and elevated above the ground to
prevent unwanted contamination.
Detergent, paints, acids, cement, grout, and solvents will also be required to complete
construction. Contamination of water by said products is easily noticeable by color and
smell of said water. Contractor shall be on alert for any oddities of stormwater and
ensure these materials are handled, operated, and cleaned up within the inside of the
structure where these materials are being applied. When external use is required, care
must be taken to ensure construction connex boxes, trailers, vehicles, or similar are not
exposed to precipitation.
Fuels and oils might be associated with the smaller construction equipment on site.
Petroleum products suspend in water and thus, are easily noticed. Monitor stormwater
and store said products in construction connex boxes, trailers, vehicles, or similar to
mitigate exposure to weather, specifically precipitation.
· On site waste management practices: Waste will undoubtedly exist on site and must
be properly removed. All large and heavy weighted waste piles (concrete chunks,
excavated pipes, and the like) must be kept in a neat, grouped pile until the material is
properly removed from the site. Said piles shall not exceed 5-10 days and are kept 50
feet from any flow lines or inlets. All dumpsters must be hauled off if full and regular haul
offs shall be scheduled. Dumpsters must also be monitored for any leakage of
“Dumpster Juice,” especially during wet conditions. Every day, the site must be walked
to collect trash to prevent littering. No burying of construction debris (including broken
concrete) is allowed on site.
· Saw cutting and grinding: Saw cutting and grinding will require hardened saws. Water
the cutting surfaces to prevent dust and other airborne particulates (refer to BMP in the
City’s Fugitive Dust Manual) is required. Utilize water on the saw itself to mitigate dust
and overheating. Contain the cutting slurry, which contains fine particulates, such as
Silica Dust and metals. After cutting is done, vacuum up the cutting slurry or sweep and
scrape the cutting slurry after it is dried.
C. BMPs FOR STORMWATER POLLUTION PREVENTION
The initial erosion and sediment control measures will consist of installing Silt Fence (SF) along
the perimeter of the site and around the perimeter of anticipated stockpile areas. Vehicle
Tracking Control (VTC) should be installed as shown on the Site Map. Prior to construction of
any concrete fixtures a Concrete Washout Area (CWA) shall be installed on site. These BMPs
will remain in place and be properly maintained until landscaping is installed and/or final
stabilization within the respective tributary area of the site occurs. All portions of land which may
be disturbed will be temporarily or permanently seeded, landscaped or paved as noted on the
design drawings (refer to Appendix J). The specifics for each measure to be utilized and/or
installed are indicated below:
STRUCTURAL PRACTICES
* Refer to Appendix D for details
· Temporary and Permanent Seeding (TS/PS): All denuded areas that will be inactive
for 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, netting and/or blankets. Stockpiles and diversion
ditches/berms must be stabilized to prevent sediment and erosion and dust issues,
respectively.
· Permanent Seeding, Sodding or Mulching (TS/PS): All areas at final grade must be
seeded or sodded within 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. 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.
· Silt Fence (SF): Silt fence is a synthetic permeable woven or non-woven geotextile
fabric incorporating support stakes at intervals sufficient to support the fence (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 storm water flows through the fabric. Silt fence shall be
located on the contour to capture overland, low-velocity sheet flows.
· Vehicle Tracking Control (VTC): All points closed to the general public and providing
access into the construction site shall include a marked construction exit that will be
monitored for any signs of tracking from the construction site. It is expected that only
trailer delivered equipment will access the exposed subgrades and that vehicle tracking
adjacent to publically accessible parking and public rights-of-way should not be evident.
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 it discharges from the site.
Discharge must be directed to the detention pond within the limits of construction as
indicated.
· Soil Stockpile Management (SP): Soil stockpiles should be located away from all
drainage system components including storm sewer inlets. Sediment control BMPs
should be placed around the perimeter of all stockpiles. Soils stockpiled for more than 30
days should be seeded and mulched with a temporary grass cover.
· 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.
· 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.
· 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.
· Construction Fence (FC): Construction fences restrict access to the construction site or
protected areas during construction. Construction fences may be chain link or plastic
mesh and are installed per manufacturer’s recommendations.
· Concrete Washout Area (CWA): Concrete washout areas are designed to receive
water from washing tools, concrete mixer chutes, liquid concrete waste from mobile
batch mixers, dump trucks, or pump trucks. A plastic liner or a prefabricated container
will be installed with each concrete washout area due to the presence of a shallow
groundwater water-table. The concrete washout area must be at least 50 feet from any
flow lines and is temporary (less than 1 year).
D. CHANGES IN CONSTRUCTION ACTIVITY AND BMP IMPLEMENTATION
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 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.
E. HAZARDOUS MATERIAL HANDLING AND SPILL PREVENTION
Any hazardous or potentially hazardous material that is brought onto the construction site will be
handled properly to reduce the potential for storm water pollution. All materials used on this
construction site will be properly stored including the use of secondary containment measures,
handled, dispensed, and disposed of following all 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 any and all 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. All 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 all spills and-+ associated clean-up and will notify the City of Fort
Collins (970-221-6700) 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 City of Fort Collins (970-221-6700).
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, and the State Oil Inspector and the City of Fort Collins 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) All materials with hazardous properties (such as pesticides, petroleum products,
fertilizers, detergents, construction chemicals, acids, paints, paint solvents, additives
for soil stabilization, concrete, curing compounds and additives, etc.) will be stored,
including secondary containment measures in a secure location and under cover,
when not in use.
b) The minimum practical quantity of all such 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 the product in a container will be used before the container is disposed of. All
such 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) All products will be stored in and used from the original container with the original
product label.
f) All 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.
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. Stabilization is defined by the City of
Fort Collins as the site has reached 70% coverage and is inspected by
the City of Fort Collins.
· 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
Once the site achieves final stabilization (see above), the BMPs can be removed.
b) Seed Mix Information
SF AC
Sod / Bed 0 0
Temp / Native Seed 236,864 5.44
c) Final Stabilization Notes:
Buildings, hardscapes, and rock beds are considered stabilized immediately upon installation.
Other exposed dirt areas require vegetation for stabilization. All seed mixtures for permanent or
temporary seeding, and the Cooper Slough buffer requires preparation of soil in accordance
with the City Municipal Code, section 12-130-132. Section 132 defines necessary actions for
soil to comply with city standards and details about communicating with other potential parties.
Vegetation should adhere to regulations specified in City of Fort Collins Landscape Standards
(LUC 3.2.1). See section 4: “Final Stabilization & Long-Term StormWater Management” bullet
for the City of Fort Collins definition of final stabilization. Reference Fort Collins’ Development
Submittal Requirements in chapter 2, section 6.1.4.9 for additional requirements of final
stabilization. The Cooper Slough 300’ Buffer enters the project site on the west side and will
require its own seeding mixture.
It is anticipated that the site is seeded in spring 2023 and will be fully established in the fall of
2023. Permanent stabilization, 70% vegetative density, is expected to be reviewed in October
2023 to help mitigate frost damage. All temporary control measures will be removed after final
stabilization. Sediment shall be properly removed from all pipes, drainage ways, and other
stormwater structures. Sediment will be properly disposed of on-site before final inspection.
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) 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 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, 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 sediment 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
All 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. Fort Collins Stormwater Criteria Manual (Addendum to the Urban Storm Drainage
Criteria Manuals Volumes 1, 2 and 3), prepared by the City of Fort Collins.
2. 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.
3. General Permit Application and Stormwater Management Plan Preparation
Guidance, Colorado Department of Public Health and Environment (CDPHE),
Revised May 2008.
APPENDIX A – Floodplain Information
FLOOD HAZARD INFORMATION
NATIONAL FLOOD INSURANCE PROGRAMFLOOD INSURANCE RATE MAP
LARIMER COUNT Y, COLORADOand Incorporated Areas
Panel Contains:
COMMUNITY NUMBER PANEL SUFFIX
09840984 JJLARIMER COUNTYFORT COLLINS, CITY OF 080101080102
MAP NUMBER08069C0984J
VERSION NUMBER2.6.4.6
SCALE
0983 1003
0992
0982
1011
0981 1001
1000*
0984
0 1,000 2,000500feet
1 inch = 500 feet 1:6,000
Map Projection:
LARIMER COUNTY
0 250 500125meters
PANEL LOCATOR
* PANEL NOT PRINTED
NOTES TO USERS))))))))))))))))
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Larimer CountyUnincorporated Areas080101
Larimer County Unincorporated Areas 080101
Larimer County Unincorporated Areas 080101
City of Fort Collins 080102
City of Fort Collins 080102
City of Fort Collins 080102
City of Fort Collins 080102
City of Fort Collins 080102
City of Fort Collins 080102
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Control Structure
Bridge
Bridge
Bridge
Bridge1 PCT AnnualChance Flood Discharge Contained in Structure
1 PCT Annual Chance Flood Discharge Contained in Structure
1 PCT Annual Chance Flood Discharge Contained in Structure
Culvert
Culvert
Cache La Poudre River- RProspect SFP
Cache LaPoudre River
Cache LaPoudre River- LPATH SFP
Cache La Poudre River Cooper SloughCooper Slough
Boxelder Creek
Boxelder Creek
Lake Canal
Cache La Poudre Reservoir Inlet
Lake CanalBox-elder Creek
Cache La Poudre River Reservoir Inlet
Cache La Poudre River Split - R Path
Box-elder Creek
Cooper Slough Overflow
Sherry Drive Overflow
Spring Creek
15
22
8
16
20
9
17
21
10
MAP AREA SHOW NON THIS PANEL ISLOCATED W ITHINTOWNSHIP 7 NORTH,RANGE 68 W EST.N TIMBERLINE RDGREENFIELDS CTE L I N C O L N A V E
JOHN DEERE DR
DONELLA CT ZEPPELINWAYSTIMBERLINERDSEFRONTAGERDINTERNATIONAL BLVD
E LOCUST ST
S W F R O N T A G E R DHORIZON AVEJENNIE DR
COUNTRY-SIDE DR
COUNTRY-SIDE CT
CRUSADER ST
RELIANT ST
VERDE AVEE MULBERRY ST EB
T
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SE FRON-TAGE RDNEFRONTAGERDHARVESTER CT
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GREENBRIAR DR
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WEICKER DR
DARREN CT
COMET ST
DASSAULT STCOLLINS AIRE LN
CLIFFORD CTTIGERCATWAY REDMAN DR
GREENBRIAR DRNWFRONTAGERDCOUNTRYSIDE DR
ANNABEL AVE SUPERCUB LN
DELOZIER RDLAKE CANAL CT
RIVERBENDDRCRUSADER ST
CONQUESTST
RIVERBEND CT S SUMMIT VIEW DRTANA DR
CENTRO WAYCHERLY ST
LAURA LN
FRONTAGE RD N
RENE DRMAX ST
KIMBERLY DRCOLEMAN ST
FRONTAGE RD S
¦25
BOXELDER DR
E PROSPECT RD
S
S
U
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W
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RSUNRISE AVE¦25
STEVEN DR
GREENFIELDS CTRAILROADQUINBY STMARQUISE ST
JOHN DEERE DRCANAL DR
FRONTAGE RD S
KENWOOD DR
BUCKEYE ST
E MULBERRY ST WB
TERRY DR
DARREN ST
SURREY LNDAWN AVESYKESDR
COMET ST
SW FRONTAGE RD
A
L
A
N S
T
SMITHFIELD DRVICOTWAYJAY DR
MARCH CTANDREASTSHARP POINT DR CLIFFORD DRJOANNE STSUMMIT CTFAIRCHILD STDELOZIER DRCONQ-UEST WAY
STOCKTON AVE
COUN-TRYS-IDE CIR
SW FRONTAGE RDSHERRY DRZONE AE
ZONE AE
ZONEAE
ZONE AE
ZONE AE(EL 4891)ZONE AE
ZONE AE
ZONE AE
ZONE AO(DEPTH 2)
ZONE AO(DEPTH 1)
ZONE AE
ZONE AE
ZONE AE
ZONE AE
ZONE AE
ZONE AE
ZONE AO (DEPTH 2)
ZONE AE
ZONE AE
ZONE AE
ZONE AE
LIMIT OF STUDY
105° 00' 00''40° 33' 45''40° 33' 45''
40° 35' 38''105° 01' 52''
105° 01' 52''
40° 35' 38''105° 00' 00''
1450000 FT
1455000 FT
3135000 FT
1450000 FT
1455000 FT
4493000m N
4492000m N
4491000m N
499000m E498000m E
PANEL 984 OF 1420
1/26/2021
Universal Transverse Mercator (UTM) Zone 13N; North American Datum 1983;Western Hemisphere; Vertical Datum: NAVD 88
SPECIAL FLOODHAZARD AREAS
OTHER AREAS OFFLOOD HAZARD
OTHERAREAS
GENERALSTRUCTURES
Without Base Flood Elevation (BFE)
With BFE or Depth
Regulator y Floodway
Area of Undetermined Flood Hazard
Area of Minimal Flood Hazard
Zone A,V, A99 Zone AE, AO, AH, VE, AR
Zone X
Zone D
HTTPS://MSC.FEMA.GOV
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTINGDOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
Cross Sections with 1% Annual ChanceWater Sur face Elevation
Coastal Transect
OTHERFEATURES
Prof ile BaselineHydrographic FeatureBase Flood Elevation Line (BFE)Limit of StudyJurisdiction Boundary
Coastal Tr ansect Baseline
17.5
0.2% Annual Chance Flood Hazard, Areas of 1% annual chance f lood with average depth less than one foot or with drainage areas of less than one square mileFuture Conditions 1% Annual Chance Flood HazardArea with Reduced Flood Risk due to LeveeSee Notes.
Zone X
Zone X
Zone X
!(8
%,E 18.2
NO SCREEN
Levee, Dike, or Floodwall
Channel, Culver t, or Storm Sewer
Area with Flood Risk due to Levee Zone D
For information and questions about this Flood Insurance Rate Map (FIRM), available products associated withthis FIRM, including historic versions, the current map date for each FIRM panel, how to order products, or theNational Flood Insurance Program (NFIP) in general, please call the FEMA Mapping and Insurance eXchange at1-877-FEMA-MAP (1-877-336-2627) or visit the FEMA Flood Map Service Center website athttps://msc.fema.gov. Available products may include previously issued Letters of Map Change, a FloodInsurance Study Report, and/or digital versions of this map. Many of these products can be ordered or obtaineddirectly from the website.
Communities annexing land on adjacent FIRM panels must obtain a current copy of the adjacent panel as well asthe current FIRM Index. These may be ordered directly from the Flood Map Service Center at the number listedabove.
For community and countywide map dates refer to the Flood Insurance Study Report for this jurisdiction.
To determine if flood insurance is available in this community, contact your Insurance agent or call the NationalFlood Insurance Program at 1-800-638-6620.
Base map information shown on this FIRM was derived from the National Flood Hazard Layer (NFHL), dated2013 and digital data provided by Larimer County GIS Department, dated 2018.
PRELIMINARY1/26/2021
MAP REVISED
APPENDIX B – Soils Information
Soil Map—Larimer County Area, Colorado
(Soil Information)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/20/2022
Page 1 of 344933004493400449350044936004493700449380044939004493300449340044935004493600449370044938004493900499000499100499200499300499400499500499600499700499800499900500000
499000 499100 499200 499300 499400 499500 499600 499700 499800 499900 500000
40° 35' 46'' N 105° 0' 46'' W40° 35' 46'' N104° 59' 59'' W40° 35' 23'' N
105° 0' 46'' W40° 35' 23'' N
104° 59' 59'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 200 400 800 1200
Feet
0 50 100 200 300
Meters
Map Scale: 1:5,040 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 17, Sep 7, 2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 2, 2021—Aug 25,
2021
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.
Soil Map—Larimer County Area, Colorado
(Soil Information)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/20/2022
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
22 Caruso clay loam, 0 to 1
percent slope
16.5 17.8%
33 Fluvaquents, nearly level 2.5 2.7%
40 Garrett loam, 0 to 1 percent
slopes
19.1 20.6%
63 Longmont clay, 0 to 3 percent
slopes
24.9 27.0%
73 Nunn clay loam, 0 to 1 percent
slopes
28.8 31.2%
74 Nunn clay loam, 1 to 3 percent
slopes
0.0 0.0%
76 Nunn clay loam, wet, 1 to 3
percent slopes
0.7 0.7%
Totals for Area of Interest 92.4 100.0%
Soil Map—Larimer County Area, Colorado Soil Information
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
10/20/2022
Page 3 of 3
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
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/18/2021
Page 4 of 4
APPENDIX C – Erosion and Sediment Control Escrow/Security
Calculations
Project:Disturbed Acres*:5.44
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F.4017 $1.85 $7,431.45
Sediment Control Log each 0 $20.00 $0.00
each 0 $75.00 $0.00
Outlet Protection CY 0 $40.00 $0.00
each 1 $200.00 $200.00
each 2 $700.00 $1,400.00
Sub-Total:$9,031.45
1.5 x Sub-Total:$13,547.18
Amount of security:$13,547.18
Total Acres x Price/acre:$7,344.00
$1,350.00 Sub-Total:$7,344.00
1.5 x Sub-Total:$11,016.00
Amount to Re-seed:$11,016.00
Minimum escrow amount:$3,000.00
Erosion Control Escrow:$13,547.18
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”
Curb Inlet 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
Bloom Offsite Water
Unit Price of Seeding per acre:
APPENDIX D – Construction Sequence Matrix
Project: Bloom Offsite Water Date:10/19/2022
Municipality: City of Fort Collins
Mobilization Demolition Earth Work
Utilities
Installation
Flat work
Installation
Vertical
Installation Landscape Demobilization
Best Management Practices (BMPs)
Structural "Installation"
Silt Fence Barriers*
Contour Furrows (Ripping / Disking)
Sediment Trap / Filter
Vehicle Tracking Pad*
Collecting Asphalt / Concrete Saw Cutting Waste
*All BMPs to be Removed once Construction is Complete.
Vegetative
Temporary Seeding Planting Any time the site will sit dorment longer than 30 Days.
Permanent Seeding Planting
Construction Sequence Matrix
APPENDIX E – Best Management Practice (BMP) Details
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
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CF-1. A construction fence helps delineate areas where
existing vegetation is being protected. Photo courtesy of Douglas
County.
Description
A construction fence restricts site access
to designated entrances and exits,
delineates construction site boundaries,
and keeps construction out of sensitive
areas such as natural areas to be
preserved as open space, wetlands and
riparian areas.
Appropriate Uses
A construction fence can be used to
delineate the site perimeter and locations
within the site where access is restricted
to protect natural resources such as
wetlands, waterbodies, trees, and other
natural areas of the site that should not be
disturbed.
If natural resource protection is an objective, then the construction fencing should be used in combination
with other perimeter control BMPs such as silt fence, sediment control logs or similar measures.
Design and Installation
Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s
recommendations. See Detail CF-1 for typical installations.
Do not place construction fencing in areas within work limits of machinery.
Maintenance and Removal
Inspect fences for damage; repair or replace as necessary.
Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.
Fencing should be removed once construction is complete.
Construction Fence
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SM-3 Construction Fence (CF)
CF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-3
Urban Storm Drainage Criteria Manual Volume 3
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.
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
PAGE 1 OF 2
8. Temporary Berm (TB)
1. DESCRIPTION:
Temporary Berms are temporary control measure
barriers made of compacted subsoil or other
approved materials such as embankment or sand
bags. Their function is to intercept and divert
sheet surface runoff away from areas not yet
stabilized, prevent erosion, manage sheet flow,
and reduce sediment transport.
2. CONTROL MEASURE USES
☒ Erosion Control
☒ Sediment Control
☐ Site/Materials Management
3. RELEVANT SPECIFICATION SECTIONS
Section 208 – Erosion Control
a) 208.05 (d) – Construction BMPS
b) 208.11 – Method of Measurement
4. RELEVANT M-STANDARD DETAILS
M-208-1, Sheet 7 of 11 (Grading Applications)
5. BASIS OF PAYMENT
Pay item Description Pay Unit
208-00300 Temporary Berm LF
6. APPLICATIONS
• May be constructed across roadways
(transverse berm) at a slight angle with
respect to the centerline.
• May be constructed along the top edge of
fill slopes or below the toe of exposed and
erodible slopes (upslope or downslope side
of a construction area). They can also be
used at storm drain inlets (when approved)
and across minor swales and ditches.
• May be used to construct Rough Cut Street
Control measures.
• May be used to divert surface sheet flows
from areas where flows may damage
property or interfere with establishment
of vegetation.
• May be used to divert surface runoff to
other control measures like Sediment
Traps.
Temporary Berm along access road
• May be used on relatively flat slopes to
capture surface runoff to shorten the
overall slope length before it has a chance
to concentrate and cause rill and gully
erosion
7. LIMITATIONS
• Only to be used as a temporary measure
on flat areas with slopes less than 2H:1V.
• Must use a secondary erosion control
measure device when sediment control is
an objective.
• Susceptible to erosion when intercepted
concentrated flows have high velocities.
8. SOILS TRIANGLE
PAGE 2 OF 2
8. Temporary Berm (TB)
9. SWMP ADMINISTRATOR FOR DESIGN CRITERIA
• Temporary Berm:
o Berm must be at least 18 inches tall or high enough to prevent overtopping.
o Berm must have a minimum of 4- to 6-foot base.
o Gradient of all receiving area above berm must be less than 2:1, or flatter.
o Berms must be designed so that flow line of water is at a gradient of less than 3 percent.
Greater than 3 percent may require the use of Check Dams in the flow line behind the
berm.
o Outlets of anticipated flow from captured water behind berms must be designed with
additional control measures suitable to control concentrated flow. Maximum drainage area
for each outlet must be limited to 2 acres.
o Berms installed taller than 2 feet require additional control measures at the toe opposite
of the conveyance side.
10. INSTALLATION CRITERIA
• Construct Temporary Berm using native subsoil materials that can be compacted. Topsoil may
not be used to construct these structures.
• Temporary Berm must be compacted manually or by mechanical means.
• The berms shall be constructed at regular intervals along the road and shall be perpendicular
to the longitudinal slope from the outer edge of the swale to the crown of the road.
11. MAINTENANCE AND REMOVAL
• When upstream area is stabilized, Temporary Berms may be removed. Disturbed area around
control measure must be cleared of any debris or sediment, receive subgrade soil preparation,
and be seeded and mulched.
• Removed material for Temporary Berms may be distributed on-site at a location approved by
the Engineer.
• Inspect Temporary Berms on a daily basis for signs of erosion, stability, and compaction.
Whenever erosion is spotted, replace lost material and recompact berm to match original
conditions.
• If intensive maintenance is necessary to keep this control measure functional, consider using a
different control measure device (see Silt Dike [fact sheet No. 19] or Erosion Logs [fact sheet
No. 17].
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
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
Commona
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum
'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum
'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
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 wheatgrassd Agropyron cristatum
'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium
'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats gramae Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped 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.
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
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
Appendix F - Colorado Discharge Permit System (CDPS) Application
For Agency Use Only
Permit Number Assigned
COR03-__________________________
Date Received ______/______/______
MM DD YYYY
COLORADO DISCHARGE PERMIT SYSTEM (CDPS)
STORMWATER DISCHARGE ASSOCIATED WITH CONSTRUCTION ACTIVITIES 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-WQPS-B2
Denver, CO 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.
Responsible Person (Title):
* PERMITTEE (if more than one please add additional pages)
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Dedicated to protecting and improving the health and environment of the people of Colorado
Water Quality Control Division
4300 Cherry Creek Drive South
WQCD-WQPS-B2
Denver, CO 80246-1530
(303) 692– 3500 www.coloradowaterpermits.com
PERMIT INFORMATION
Reason for Application: NEW CERT RENEW CERT EXISTING CERT#
Applicant is: Property Owner Contractor/Operator
A. CONTACT INFORMATION—NOT ALL CONTACTS MAY APPLY *indicates required
* ORGANIZATION FORMAL NAME:
1) * PERMITTEE CONTACT the person authorized to sign and certify the permit application.
This person receives all permit correspondences and is the person responsible for ensuring compliance with the permit.
Currently Held By (Person): FirstName: LastName:
Telephone: Email Address:
Organization:
Mailing Address:
City: State: Zip Code:
This form must be signed by the Permittee (listed in item 1) to be considered complete.
Per Regulation 61 In all cases, it shall be signed as follows:
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.
In the case of a partnership, by a general partner.
In the case of a sole proprietorship, by the proprietor.
In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official.
SW Construction Application for: page 1 of 5
HOW TO COMPLETE THIS APPLICATION
1. Online via web browser. You must use Internet Explorer (version 8 and above). All other browsers disable the electronic submission features.
OR
2. Download and save this form to your computer. Then open Adobe Reader (or Acrobat), select File, then Open and navigate to where the form is saved. This is the best
option if using a Mac computer (Do not use the Mac Preview program).
Responsible Person (Title):
2) DMR COGNIZANT OFFICIAL (i.e. authorized agent) the person or position authorized to sign and certify reports required by the Division
including Discharge Monitoring Reports *DMR’s, Annual Reports, Compliance Schedule submittals, and other information requested by the
Division. The Division will transmit pre-printed reports (ie. DMR’s) to this person. If more than one, please add additional pages.
Currently Held By (Person): FirstName: LastName:
Telephone: Email Address:
Organization:
Mailing Address:
City: State: Zip Code:
Same as 1) Permittee
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.
Responsible Person (Title):
Currently Held By (Person): FirstName: LastName:
Telephone: Email Address:
Organization:
Mailing Address:
City: State: Zip Code:
Same as 1) Permittee
4) *BILLING CONTACT if different than the permittee.
3) *SITE CONTACT local contact for questions relating to the facility & discharge authorized by this permit
Responsible Person (Title):
Currently Held By (Person): FirstName: LastName:
Telephone: Email Address:
Organization:
Mailing Address:
City: State: Zip Code:
Same as 1) Permittee
SW Construction Application for: page 2 of 5
B)PERMITTED PROJECT/FACILITY INFORMATION
5) OTHER CONTACT TYPES (check below) Add pages if necessary:
LastName:
Email Address:
Responsible Person (Title):
Currently Held By (Person):
Telephone:
Organization:
Mailing Address:
City: State: Zip Code:
001A Latitude
Decimal Degrees
Pretreatment Coordinator
Environmental Contact
Biosolids Responsible Party
Other:
Property Owner
Inspection Facility Contact
Consultant
Compliance Contact
Stormwater MS4 Responsible Person
Stormwater Authorized Representative
Project/Facility Name
Street Address or Cross Streets
(e.g., “S. of Park St. between 5th Ave. and 10th Ave.”, or “W. side of C.R. 21, 3.25 miles N. of Hwy 10”; A street name without an address,
intersection, mile marker, or other identifying information describing the location of the project is not adequate. For linear projects, the route of
the project should be described as best as possible with the location more accurately indicated by a map.)
Facility Latitude/Longitude - (approximate center of site to nearest 15 seconds using one of the following formats)
001A Longitude .
Degrees (to 3 decimal places)
.
Degrees (to 3 decimal places)
(e.g., 39.703°, 104.933°)
001A Latitude 001A Longitude o
Degrees
‘
Minutes Seconds
“ o
Degrees
‘
Minutes Seconds
“ e.g., 39°46'11"N, 104°53'11"W
Degrees, Minutes, Seconds
OR
For the approximate center point of the property, to the nearest 15 seconds. The latitude and longitude must be provided as either degrees,
minutes, and seconds, or in decimal degrees with three decimal places. This information may be obtained from a variety of sources, including:
Surveyors or engineers for the project should have, or be able to calculate, this information.
EPA maintains a web-based siting tool as part of their Toxic Release Inventory program that uses interactive maps and aerial pho-
tography to help users get latitude and longitude. The siting tool can be accessed at www.epa.gov/tri/report/siting_tool/index.htm
U.S. Geological Survey topographical map(s), available at area map stores.
Using a Global Positioning System (GPS) unit to obtain a direct reading.
Note: the latitude/longitude required above is not the directional degrees, minutes, and seconds provided on a site legal description to define
property boundaries.
C)MAP (Attachment) If no map is submitted, the permit will not be issued Facility Information
Map: Attach a map that indicates the site location and that CLEARLY shows the boundaries of the area that will be disturbed. Maps must be no
larger than 11x17 inches.
D)LEGAL DESCRIPTION
Legal description: If subdivided, provide the legal description below, or indicate that it is not applicable (do not supply Township/Range/Section
or metes and bounds description of site)
Subdivision(s):Lot(s): Block(s)
OR Not applicable (site has not been subdivided)
SW Construction Application for: page 3 of 5
City:Zip Code:County:
Total area of project site (Acres) Area of project site to undergo disturbance (Acres)
Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas,
and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover
E)AREA OF CONSTRUCTION SITE
Total disturbed area of Larger Common Plan of Development or Sale. If applicable:
SW Construction Application for: page 4 of 5
Single Family Residential Development
Other—Description:
(i.e., total, including all phases, filings, lots, and infrastructure not covered by this application)
Provide both the total area of the construction site, and the area that will undergo disturbance, in acres. Note: aside from clearing, grading and excavation
activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage
that disturb existing vegetative cover (see construction activity description under the APPLICABILITY section on page 1). If the project is part of a larger common
plan of development or sale (see the definition under the APPLICABILITY section on page 1), the disturbed area of the total plan must also be included.
F)NATURE OF CONSTRUCTION ACTIVITY
Check the appropriate box(s) or provide a brief description that indicates the general nature of the construction activities. (The full description of activities must be
included in the Stormwater Management Plan.)
Multi-Family Residential Development
Commercial Development
Oil and Gas Production and/or Exploration (including pad sites and associated infrastructure)
Highway/Road Development (not including roadways associated with commercial or residential development)
G)ANTICIPATED CONSTRUCTION SCHEDULE
Final Stabilization Date: Construction Start Date:
Construction Start Date - This is the day you expect to begin ground disturbing activities, including grubbing, stockpiling, excavating, demolition,
and grading activities.
Final Stabilization Date - in terms of permit coverage, this is when the site is finally stabilized. This means that all ground surface disturbing
activities at the site have been completed, and all disturbed areas have been either built on, paved, or a uniform vegetative cover has been
established with an individual plant density of at least 70 percent of pre-disturbance levels. Permit coverage must be maintained until the site is
finally stabilized. Even if you are only doing one part of the project, the estimated final stabilization date must be for the overall project.
If permit coverage is still required once your part is completed, the permit certification may be transferred or reassigned to a new responsible
entity(s).
H)RECEIVING WATERS (If discharge is to a ditch or storm sewer, include the name of the ultimate receiving waters)
Immediate Receiving Water(s):
Ultimate Receiving Water(s):
Identify the receiving water of the stormwater from your site. Receiving waters are any waters of the State of Colorado. This includes all water courses, even if they
are usually dry. If stormwater from the construction site enters a ditch or storm sewer system, identify that system and indicate the ultimate receiving water for the
ditch or storm sewer. Note: a stormwater discharge permit does not allow a discharge into a ditch or storm sewer system without the approval of the owner/
operator of that system.
I)SIGNATURE PAGE
STORMWATER MANAGEMENT PLAN CERTIFICATION
Ink Signature Electronic Signature
1.You may print and sign this document and mail the hard copy to the State along with required documents.
OR
2.Electronic Submission Signature
You may choose to submit your application electronically, along with required attachments. To do so, click the SUBMIT button below which will direct you, via
e-mail , to sign the document electronically using the DocuSign Electronic Signature process. Once complete, you will receive, again via e-mail, an electronically
stamped Adobe pdf of this application. Print the signature page from the electronically stamped pdf, sign it and mail it to the WQCD Permits Section to complete
the application process (address is on page 1 of the application).
The Division encourages use of the electronic submission of the application and electronic signature. This method meets signature requirements as
required by the State of Colorado.
The ink signed copy of the electronically stamped pdf signature page is also required. This requirement meets Federal EPA Requirements.
Processing of the application will begin with the receipt of the valid electronic signature.
“I certify under penalty of law that a complete Stormwater Management Plan, as described in Appendix B of this application, has been prepared for my activity.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the Stormwater
Management Plan is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for falsely certifying
the completion of said SWMP, including the possibility of fine and imprisonment for knowing violations."
Date:
Signature of Legally Responsible Person or Authorized Agent (submission must include original signature)
Name (printed) Title
"I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to
assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete.
I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations."
“I understand that submittal of this application is for coverage under the State of Colorado General Permit for Stormwater Discharges Associated with Construction
Activity for the entirety of the construction site/project described and applied for, until such time as the application is amended or the certification is
transferred, inactivated, or expired.” [Reg 61.4(1)(h)]
DO NOT INCLUDE A COPY OF THE STORMWATER MANAGEMENT PLAN
DO NOT INCLUDE PAYMENT—AN INVOICE WILL BE SENT AFTER THE CERTIFICATION IS ISSUED.
This form must be signed by the Permittee to be considered complete. Per Regulation 61 In all cases, it 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 over
all 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
SW Construction Application for: page 5 of 5
3rd Party Preparer: If this form was prepared by an authorized agent on behalf of the Permittee, please complete the fields below.
Preparer Name (printed) Email Address
For Docusign
Appendix G - Sample Inspection Log
Appendix H – Floodplain Permit
Appendix I – GroundWater Information
TH-1 TH-2
TH-4
TH-7
TH-8
TH-6
TH-5
TH-3
Mulberry Road
11
10
9
8
6
7
MULBERRY RD.
VINE DR.I - 25CR 9ESITE
LEGEND:
INDICATES APPROXIMATE
LOCATION OF EXPLORATORY
BORING
INDICATES
DEPTH-TO-GROUNDWATER
(FEET)
TH-1
7
HARTFORD HOMES
SPRINGER-FISCHER PROPERTY
CTL I T PROJECT NO. FC07733-115 FIGURE 4
Depth-to-Groundwater
Countour Map
VICINITY MAP
(FORT COLLINS, COLORADO)
NOT TO SCALE
500'
APPROXIMATE
SCALE: 1" = 500'
Appendix J – Site Map and Design Drawings
Erosion Control Plans
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STAMP
H:\Hartford Homes\CO Fort Collins HFH22 - Mulberry\0CIV\3-CD\Offsite water\HFH022_OFW_C4.0_Erosion control.dwg - Matthew Kasch - 10/20/2022Init.#Issue / DescriptionDateFINAL DEVELOPMENT PLANS BLOOM OFFSITE WATERFORT COLLINS, COTHESE PLANS ARE AN INSTRUMENT OF SERVICE
AND ARE THE PROPERTY OF GALLOWAY, AND MAY
NOT BE DUPLICATED, DISCLOSED, OR REPRODUCED
WITHOUT THE WRITTEN CONSENT OF GALLOWAY.
COPYRIGHTS AND INFRINGEMENTS WILL BE
ENFORCED AND PROSECUTED.
COPYRIGHT
GallowayUS.com
5265 Ronald Reagan Blvd., Suite 210
Johnstown, CO 80534
970.800.3300
PRELIMINARYNOT FOR BIDDINGNOT FOR CONSTRUCTIONDate:
Drawn By:
Project No:
Checked By:
10.06.2022
HFH000022
MCK
JEP
EROSION CONTROL PLAN
C4.0
KEYMAP
Know what's
before you dig.
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STAMP
H:\Hartford Homes\CO Fort Collins HFH22 - Mulberry\0CIV\3-CD\Offsite water\HFH022_OFW_C4.0_Erosion control.dwg - Matthew Kasch - 10/20/2022Init.#Issue / DescriptionDateFINAL DEVELOPMENT PLANS BLOOM OFFSITE WATERFORT COLLINS, COTHESE PLANS ARE AN INSTRUMENT OF SERVICE
AND ARE THE PROPERTY OF GALLOWAY, AND MAY
NOT BE DUPLICATED, DISCLOSED, OR REPRODUCED
WITHOUT THE WRITTEN CONSENT OF GALLOWAY.
COPYRIGHTS AND INFRINGEMENTS WILL BE
ENFORCED AND PROSECUTED.
COPYRIGHT
GallowayUS.com
5265 Ronald Reagan Blvd., Suite 210
Johnstown, CO 80534
970.800.3300
PRELIMINARYNOT FOR BIDDINGNOT FOR CONSTRUCTIONDate:
Drawn By:
Project No:
Checked By:
10.06.2022
HFH000022
MCK
JEP
EROSION CONTROL PLAN
C4.1
KEYMAP
Know what's
before you dig.
Know what's
before you dig.
MCK
JEP
EROSION CONTROL DETAILS
C4.2
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H:\Hartford Homes\CO Fort Collins HFH22 - Mulberry\0CIV\3-CD\Offsite water\HFH022_OFW_4.2_EC_Details.dwg - Matthew Kasch - 10/20/2022Init.#Issue / DescriptionDateFINAL DEVELOPMENT PLANS BLOOM OFFSITE WATERFORT COLLINS, COTHESE PLANS ARE AN INSTRUMENT OF SERVICE
AND ARE THE PROPERTY OF GALLOWAY, AND MAY
NOT BE DUPLICATED, DISCLOSED, OR REPRODUCED
WITHOUT THE WRITTEN CONSENT OF GALLOWAY.
COPYRIGHTS AND INFRINGEMENTS WILL BE
ENFORCED AND PROSECUTED.
COPYRIGHT
GallowayUS.com
5265 Ronald Reagan Blvd., Suite 210
Johnstown, CO 80534
970.800.3300
PRELIMINARYNOT FOR BIDDINGNOT FOR CONSTRUCTIONDate:
Drawn By:
Project No:
Checked By:
10.06.2022
HFH000022