HomeMy WebLinkAboutPlans - Stormwater Management Plan - 05/21/2025
STORMWATER MANAGEMENT PLAN
THE LINDEN
FORT COLLINS, COLORADO
MAY 21ST, 2025
EPSGROUPINC.COM
970.221.4158
FORT COLLINS
GREELEY
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May 21st, 2025
City of Fort Collins
Stormwater Development Review
700 Wood Street
Fort Collins, CO 80521
RE: STORMWATER MANAGEMENT PLAN
The Linden
To Whom It May Concern:
EPS Group, Inc. is pleased to submit this Stormwater Management Plan for The Linden project. This report
outlines Best Management Practices (BMPs) to be implemented with the proposed construction to minimize
potential pollutants in stormwater discharges.
We have prepared this report to accompany the Colorado Department of Public Health and Environment
General Permit for Stormwater Discharge Associated with Construction Activities (aka, Stormwater Discharge
Permit or SDP). The General Permit No. for this SDP is (to be filled-in by permittee), and the Certification No. for
this SDP is (to be filled-in by permittee). The Permit Certification is effective beginning (to be filled-in by
permittee), and initial certification expires (to be filled-in by permittee). A copy of the issuance cover letter can
be found in Appendix D of this document (to be filled-in by permittee).
Please note this Stormwater Management plan (including the Site Maps) is not a static document. It is a dynamic
device that should be kept current and logged as construction occurs. As such, this version was prepared to
facilitate initial plan approvals and permits but does not necessarily reflect the final version or the transitions
throughout the construction process. As the site develops and changes, the contractor is expected and
encouraged to change the content, in order for the SWMP works as effectively and efficiently as possible. It shall
be the responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to ensure the
plan is properly maintained and followed.
If you should have any questions or comments as you review this report, please feel free to contact us at your
convenience.
Sincerely,
EPS GROUP, INC.
Mason Ruebel, PE
Project Engineer
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TABLE OF CONTENTS
1.0 PROJECT DESCRIPTIONS AND NATURE OF CONSTRUCTION ..............................................1
1.1 EXISTING SITE DESCRIPTION .................................................................................................................. 1
1.2 NATURE OF CONSTRUCTION ACTIVITY ................................................................................................... 1
1.3 SITE DISTURBANCE ................................................................................................................................. 2
1.4 EXISTING TOPOGRAPHIC AND SOIL DATA .............................................................................................. 2
1.5 RECEIVING WATERS ................................................................................................................................. 2
1.6 EXISTING SITE CONDITIONS AND VEGETATION ...................................................................................... 2
1.7 EXISTING GROUNDWATER ....................................................................................................................... 3
1.8 EXISTING GROUND CONTAMINATION ..................................................................................................... 3
2.0 PROPOSED CONSTRUCTION ACTIVITIES .........................................................................3
2.1 SEQUENCE OF MAJOR ACTIVITIES .......................................................................................................... 3
3.0 GENERAL REQUIREMENTS ............................................................................................3
3.1 OBJECTIVES ............................................................................................................................................. 3
3.2 SMWP AVAILABILITY................................................................................................................................. 3
3.3 DEFINITIONS ............................................................................................................................................ 3
3.4 ADDITIONAL PERMITTING ....................................................................................................................... 4
4.0 ENVIRONMENTAL IMPACT ............................................................................................4
5.0 POTENTIAL POLLUTION SOURCES .................................................................................4
5.1 DISTURBED AND STORED SOILS ............................................................................................................. 5
5.2 VEHICLE TRACKING OF SEDIMENT .......................................................................................................... 5
5.3 MANAGEMENT OF CONTAMINATED SOILS .............................................................................................. 5
5.4 LOADING AND UNLOADING OPERATIONS............................................................................................... 6
5.5 OUTDOOR STORAGE OF CONSTRUCTION SITE MATERIALS, BUILDING MATERIALS, CHEMICALS, ETC.
.................................................................................................................................................................. 6
5.6 BULK STORAGE OF MATERIALS ............................................................................................................... 6
5.7 VEHICLE AND EQUIPMENT MAINTENANCE AND FUELING ...................................................................... 6
5.8 SIGNIFICANT DUST OR PARTICULATE GENERATING PROCESSES ......................................................... 7
5.9 ROUTING MAINTENANCE ACTIVITIES INVOLVING FERTILIZER, PESTICIDES, DETERGENTS, FUELS,
SOLVENTS, OILS ...................................................................................................................................... 7
5.10 ON-SITE WASTE MANAGEMENT PRACTICES ........................................................................................... 7
5.11 CONCRETE TRUCK/EQUIPMENT WASHING ............................................................................................ 8
5.12 DEDICATED ASPHALT AND CONCRETE BATCH PLANTS ......................................................................... 8
5.13 NON-INDUSTRIAL WASTE SOURCES SUCH AS WORKER TRASH AND PORTABLE TOILETS ................... 8
5.14 SAW CUTTING AND GRINDING ................................................................................................................. 9
5.15 MATERIAL HANDLING AND SPILL PREVENTION ...................................................................................... 9
5.16 NON-STORMWATER DISCHARGES, INCLUDING CONSTRUCTION DEWATERING NOT COVERED
UNDER THE CONSTRUCTION DEWATERING DISCHARGES GENERAL PERMIT AND WASH WATER THAT
MAY CONTRIBUTE TO POLLUTANTS TO THE MS4 ................................................................................ 10
6.0 STORMWATER MANAGEMENT CONTROLS ..................................................................... 10
6.1 SWMP ADMINISTRATOR......................................................................................................................... 10
6.2 OWNER INFORMATION .......................................................................................................................... 11
6.3 BEST MANAGEMENT PRACTICES (BMPS) FOR STORMWATER POLLUTION PREVENTION ................... 11
6.4 STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL ................................................... 11
6.5 NON-STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL .......................................... 13
6.6 PHASED BMP INSTALLATION ................................................................................................................ 15
6.7 BMP INSPECTION ................................................................................................................................... 16
6.8 BMP MAINTENANCE ............................................................................................................................... 17
6.9 RECORD KEEPING .................................................................................................................................. 17
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TABLE OF CONTENTS
7.0 FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT ............................. 18
7.1 FINAL STABILIZATION ............................................................................................................................ 18
7.2 LONG-TERM STORMWATER MANAGEMENT .......................................................................................... 18
8.0 ADDITIONAL SWMP AND BMP RESOURCES .................................................................... 19
9.0 REFERENCES ............................................................................................................ 19
FIGURES AND TABLES
FIGURE 1 – VICINITY MAP ................................................................................................................................................................. 1
TABLE 2 – PRELIMINARY PERMIT AND CONSTRUCTION SCHEDULE ............................................................................. 16
APPENDICES
APPENDIX A – SITE MAPS
APPENDIX B – EROSION CONTROL DETAILS
APPENDIX C – LANDSCAPE PLAN
APPENDIX D – COPIES OF PERMITS/APPLICATIONS
APPENDIX E – INSPECTION LOGS
APPENDIX F – CONTRACTOR INSERTS (AS NEEDED)
APPENDIX G – CONTRACTOR INSERTS (AS NEEDED)
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1.0 PROJECT DESCRIPTIONS AND NATURE OF CONSTRUCTION
1.1 EXISTING SITE DESCRIPTION
A tract of land located in portions of Block 8 and 9 along with vacated Chestnut Street, Map of Town of
Fort Collins located in the Northwest quarter of Section 12, Township North, Range 69 West of the 6th
P.M. City of Fort Collins, County of Larimer, State of Colorado. More specifically it is the 2.2-acres of land
situated around Linden St, Willow St, and Lincoln Ave.
1.2 NATURE OF CONSTRUCTION ACTIVITY
The proposed development consists of two multi-use buildings. Other proposed improvements include
a new concrete drive aisle, parking, sidewalks, and landscaping. Existing conveyance methods for
stormwater runoff will be modified to tie into existing city infrastructure. Underground infiltration
chambers will be installed to provide LID treatment.
Figure 1 – Vicinity Map
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1.3 SITE DISTURBANCE
The site disturbance will occur across roughly 2.72 acres. It is recommended that existing site condition
photos be taken prior to the demolition.
CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 2.72 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 2.20 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.52 ACRES
TOTAL STORAGE/STAGING AREA 0.1 ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 100%
EST. PERCENT VEGETATIVE COVER 10% DENSITY
EXISTING SOIL TYPE A
APPROX. GROUNDWATER DEPTH 12 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS 500 (-) CU. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE 0 SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA 250 FEET
1.4 EXISTING TOPOGRAPHIC AND SOIL DATA
In order to complete the associated construction plans, a topographical survey of the site was
completed. This survey consisted of field measurements made by EPS Group Inc. in June 2024.
A NRCS Custom Soil Resource Report of the property indicates that the soil on site is composed of Paoli
Fine Sandy Loam with slopes of 0 – 1 percent. Paoli Fine Sandy Loam is hydrologic Soil Group A and
considered well drained with high infiltration rates and low runoff potential.
NRCS indicates a wind erodibility rating of 6 (of a scale of 1 to 8, 1 is most susceptible to erosion), and as
such this site does not have a high potential for wind erosion. NRCS indicates an erosion factor, K, of 0.32
(range of 0.02-0.69, 0.69 being more susceptible to sheet and rill erosion). As such, this site has a
moderate susceptibility to sheet and rill erosion.
1.5 RECEIVING WATERS
The project site is located adjacent to the Cache La Poudre River. All runoff generated on the project site
will be routed to an existing public storm drain within Willow Street. Runoff is conveyed to the Udall
Regional Water Quality Pond and ultimately discharges to the Cache La Poudre River. Offsite flows being
routed through the site will eventually be routed down Lincoln Avenue to the Udall Pond. At the date of
this report there is no official timeline for when the ultimate condition will be constructed.
1.6 EXISTING SITE CONDITIONS AND VEGETATION
The site has had various occupants throughout its history. One half of the property has several existing
buildings, a concrete parking area, gravel yards and sparse vegetation. The other half of the property is
currently covered in gravel and is being used as an overflow parking area for Ginger and Baker. Existing
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ground slopes are mild to moderate (i.e., 1-6%) through the interior of the property. General topography
slopes from southwest to northeast. It is highly recommended that pre-construction photos be taken to
clearly document vegetative conditions prior to any disturbance activities.
1.7 EXISTING GROUNDWATER
Groundwater depth has been measured between 10’ to 12’ with previous projects. Updated
measurements will be included prior to final approval.
1.8 EXISTING GROUND CONTAMINATION
No existing groundwater contamination has been identified at this time.
2.0 PROPOSED CONSTRUCTION ACTIVITIES
2.1 SEQUENCE OF MAJOR ACTIVITIES
To complete the project, many basic categories of construction activity will take place. As part of The
Linden project, the existing buildings and gravel parking lot will be removed. The topsoil and native
grasses that are currently on-site will also require stripping. Next, is utility installation including sanitary
sewer services, water service, fire service, underground chambers and storm sewer. New curb/gutter,
paving, and sidewalks are expected to begin after utility installation. During the installation of the
hardscapes the building will begin to go vertical. The final stages of site construction will be fine grading
and landscaping throughout the project site. The sequencing is an initial best guess and is subject to
change at the Contractor’s discretion.
3.0 GENERAL REQUIREMENTS
3.1 OBJECTIVES
The objective of a Stormwater Management Plan (SWMP) is to identify all potential sources of pollution
likely to occur as a result of construction activity associated with the site construction and to describe the
practices that will be used to reduce the pollutants in stormwater discharges from the site. The SWMP
must be completed and implemented at the time the project breaks ground and revised as necessary as
construction proceeds to accurately reflect the conditions and practices at the site.
This report summarizes the Stormwater Management Plan for the construction activity that will occur
with The Linden project in Fort Collins, CO. This plan has been prepared according to regulations of the
Colorado Department of Public Health and Environment (CDPHE), Water Quality Control Division. This
report has been provided to meet the requirements of the City of Fort Collins Municipal Code §26-498 on
water quality control.
3.2 SMWP AVAILABILITY
This report is intended to remain on the construction site to allow for maintenance and inspection
updates and for review during inspection.
3.3 DEFINITIONS
BMP – Best Management Practice encompassing a wide range of erosion and sediment control practices,
both structural and non-structural in nature, intended to reduce or eliminate any possible water quality
impacts from stormwater leaving a construction site.
Erosion Control BMPs – Practices that PREVENT the erosion of soil, such as minimizing the amount of
disturbed area through phasing, temporary stabilization, and preserving existing vegetation.
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Sediment Control BMPs – Practices to REMOVE sediment from run-off, such as sediment basins, silt
fence, or inlet protection.
Non-structural BMPs – The implementation of methods, practices, and procedures to minimize water
quality impacts, such as the preservation of natural vegetation, preventive maintenance, and spill
response procedures.
Structural BMPs – Physical devices that prevent or minimize water quality impacts, such as sediment
basins, inlet protection, or silt fence.
3.4 ADDITIONAL PERMITTING
As mentioned above, this Stormwater Management Plan is associated with the Colorado Department of
Public Health and Environment Stormwater Permit that is issued by the Water Quality Control Division of
the CDPHE. Additional Environmental permitting not described in this report may be required as a part
of this project. An example is the Construction Dewatering Permit for groundwater. Another example is
the Air Pollution Emission Notice (APEN). The CDPHE website contains links to both of these permits, as
well as many other potential permits. The Contractor is responsible for ensuring the proper permits are
acquired.
4.0 ENVIRONMENTAL IMPACT
There are no known environmental impacts to endangered species or other environmentally sensitive
features that have been identified in this project area.
5.0 POTENTIAL POLLUTION SOURCES
As is typical with most construction sites, there are several potential pollution sources that could affect
water quality. It is not possible for this report to identify all materials used or stored on the construction
site. It is the sole responsibility of the contractor to identify and properly handle all materials that are
potential pollution sources. Likely pollution sources are marked “YES,” unlikely pollution sources are
marked “NO.” Detailed descriptions of each source are also provided for additional reference. Please note
that not all items with a detailed description are present in the project, and there could be additional
pollution sources that are not listed that must be addressed by the Contractor.
YES - Disturbed and stored soils
YES - Vehicle tracking of soils and sediment
NO - Management of contaminated soils
YES - Loading and unloading operations
YES - Outdoor storage of construction site materials, building materials, fertilizers, chemicals, etc.
NO - Bulk Storage of Materials
NO - Vehicle and equipment maintenance and fueling
YES - Significant dust or particulate generating processes
NO - Routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils,
etc.
YES - On-site waste management practices (waste piles, dumpsters, etc.)
YES - Concrete truck/equipment washing
NO - Dedicated asphalt and concrete batch plants
YES - Non-industrial waste sources, such as worker trash and portable toilets
YES - Saw Cutting and Grinding
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YES - Material Handling and Spill Prevention
NO - Non-Stormwater Discharges including construction dewatering not covered under the
Construction Dewatering Discharges general permit and wash water that may contribute to
pollutants to the MS4
5.1 DISTURBED AND STORED SOILS
Approximately 2.72 acres of the site will be disturbed with the construction activities. Once soils have
been disturbed, they do not retain the same compaction as in their native state, therefore surface runoff
can cause more soil erosion than was historically observed. In the event that these erosion control
practices do not keep sediment on site a structural barrier (silt fence) will be used and is called out for on
the perimeter. If soil manages to migrate from the disturbed areas onto the hard surfaces, it will be swept
or scraped (street sweeping) to prevent the migration of sediment. In case that sediment is washed away
too quickly the curb inlets will need protection (rock sock style inlet protection).
Soil stockpiles are not expected on this site. Stockpiles in the same respect do not retain the same
compaction and are more susceptible to soil erosion. Stockpiles on this site shall be placed in or near the
center of the site and away from any drainage swales to not require perimeter run off controls
(Materials/Site Management Control). The stock pile will be kept loose, not compacted, and watered as
needed to prevent dust issues (site watering). The stockpile will be monitored for signs of erosion
displacement and sediment accumulation and if conditions warrant it, the stockpile will be structurally
covered or if it is going to sit a long while will be reseeded (temporary seeding).
5.2 VEHICLE TRACKING OF SEDIMENT
Vehicle tracking of sediment may occur throughout the construction process and along all areas where
the pavement meets the disturbed dirt. This occurs most often after any melt off or rain conditions when
mud collects on vehicles tires and is tracked out onto the road consequently leaving the site. This
increases the possibility of sediment discharging to the storm system. To prevent tracking, access to the
site will be limited to construction entrances (vehicle tracking pads to be installed) on the northeast side
of the site and southeast side of the site. Vehicle access will be limited on muddy days (site management
control), in this case parking will be kept to the stabilized staging area. The tracking pads will be
monitored visually every day and if track-out becomes a significant problem a larger or more robust
tracking pad may be installed. Otherwise, all track-out that reaches the street will be scraped and swept
(street sweeping). Secondary controls at the closest affected inlets will have protection (inlet protection)
to capture sediment not swept up in a timely manner.
Additional measures can be taken to minimize and control sediment discharges from the site due to
vehicle tracking. These measures can include fencing around the site to control access points. The use of
gravel parking areas and wash racks can also be implemented to ensure minimal vehicle tracking from
the site.
5.3 MANAGEMENT OF CONTAMINATED SOILS
All data about the site shows that there is no known contamination on the site. If encountered, the
contractor will have the material stored in a covered area (materials management control) as to not mix
with the stormwater until the material can be identified and proper classification and disposal methods
can be determined in accordance with the various waste laws as well as with good construction safety
and practices.
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5.4 LOADING AND UNLOADING OPERATIONS
It is anticipated that there will be minimal export leaving the site.
During this project there will be a diverse amount of loading and unloading. The foundation workers will
have to deliver forms to the site and deliver premixed concrete. Landscapers will have to pile the
materials on site to complete the landscape work. Though the loading and unloading of vehicles will
contribute to the track out of materials, depending on the material being delivered to the site there may
be significant spill potential. Where trailers must access the site an attempt will be made to keep the
vehicles on the VTC or other stabilized storage areas. When loading and unloading is occurring,
depending on the materials, there may be an increased problem of containers being dropped,
punctured, or broken. These off-loading activities will be located away from storm drains and will have
nearby spill kits accessible. Spills on site will be addressed using spill prevention and response
procedures.
5.5 OUTDOOR STORAGE OF CONSTRUCTION SITE MATERIALS, BUILDING MATERIALS,
CHEMICALS, ETC.
It is anticipated that inert materials like wood, tiles, and stone will be stored on site and outside in the
elements. It is also anticipated that materials that do not weather well (cement, mortar, etc.) will also be
located outside. Chemicals are not anticipated to be left outside. As the inert materials have a lower
potential to leave the site they should be monitored during inspection to make sure they are not being
impacted by the exposure to the elements (site management control). The materials that will need
added attention are the cements and mortars as they quickly mix with water and cause pollution issues.
These materials when not stored inside will be placed on pallets to get above potential surface runoff
and covered with tarps or plastic to prevent mixing with stormwater (materials management control).
Very small quantities of chemical are needed to contaminate stormwater so the fertilizers, paints, form
oils, petroleum products, and other typical chemicals, will be stored in the construction connex box,
trailers, vehicles, or the like, out of contact with precipitation (materials management control). If not
stored in a location as described, secondary containment will be required. The contractor shall clearly
designate site areas for staging and storage of building materials.
5.6 BULK STORAGE OF MATERIALS
This site is not expected to store bulk liquid chemicals of more than 55 gallon drums. If this site does
have the need to store liquid chemicals the following procedure should be followed.
These materials should be stored in an area that if a rupture would occur, would be contained. The area
will need to be located away from the drainage areas and area inlets (site management / materials
management). The containers will be stored in secondary containment area with a silt fence so that if a
spill were to happen, it would pool in the bottom of the area and be contained.
5.7 VEHICLE AND EQUIPMENT MAINTENANCE AND FUELING
Based on the size of the site and the duration of activities vehicle fueling and vehicle maintenance is
unlikely. However, as fueling and equipment maintenance usually results in small spills of petroleum
products it is important to monitor these activities carefully. (site management control) Some grading
companies require the maintenance of a broken machine on site or will employ a fuel truck to fill heavy
equipment. In the cases where the vehicle is not able to be maintained off site, these activities will be
done in the least detrimental way possible. The maintenance and fueling will be located as far from
stormwater features as possible and at least 50 feet from detention ponds (site management/materials
management). The fueling activity will have spill materials nearby and a bucket or other container as well
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as a shovel located nearby to catch drips, and to scoop up any dirt that inadvertently mixed with the soil
(materials management). That container will have a lid and be disposed of when the activity is
completed. The maintenance work will be done on a tarp or other material to prevent the residual oils
and greases from mixing with the dirt (materials management). A clearly designated on-site fueling and
maintenance area has not been suggested.
5.8 SIGNIFICANT DUST OR PARTICULATE GENERATING PROCESSES
This project will result in earth moving activities, street sweeping, track-out and carry out, bulk materials,
and transport. As these activities may result in offsite transport of atmospheric pollution reasonable
precautions shall be taken. The project will follow all required “BMPs” articulated in the Fugitive Dust
Manual and additional BMP’s included during each of the identified activities in accordance with City
Ordinance No. 044 2016. A copy of the Fugitive Dust Control Manual will also be kept in the trailer during
construction for reference. Such precautions will include but not be limited to watering the site, covering
trucks, lowering site speeds and vehicle tracking mentioned above.
5.9 ROUTING MAINTENANCE ACTIVITIES INVOLVING FERTILIZER, PESTICIDES, DETERGENTS,
FUELS, SOLVENTS, OILS
Fertilizers and pesticides will be used during the later phases of the project when trying to establish
healthy vegetation. These chemicals are highly water soluble and are easily and unnoticeably carried in
the stormwater. Proper application rates and recommended timing of application will be strictly
followed, and not applied on days, or the following days, where the weather is calling for precipitation
(materials management control). As most of these types of chemicals will be brought on by the
landscapers, they will be required to keep these products in their vehicles until time of application and
not be allowed to leave these materials on the site (site management control). If these materials are
stored on site, they shall be kept inside or outside covered and above the ground to prevent the
materials from mixing with water and runoff (materials management control). Detergents, paints, acids,
cement, grout, and solvents will be prevalent in the interior work of the building (materials
management). These materials also are easily mixed with water yet are typically noticeable by discolored,
cloudy, or sudsy water. As such, the contractor will always keep an eye out for these types of differences
in water around the site (site management control). However, these materials are to be handled,
operated, and cleaned up all within the structure. Where external use is concerned these materials will
be stored in the construction connex box, trailers, vehicles, or the like, out of contact with precipitation
(materials management). If not stored in a location as described, secondary containment will be required
(materials management). Fuels and oils might be associated with the smaller equipment used on site;
chainsaws, pumps, generators, etc. Petroleum products are easily suspended in water and are spread
across the top of the water surface. When these products are located in water it will have a rainbow
sheen, which will be monitored during construction (site management controls). These products will be
stored in the construction connex box, trailers, vehicles, or similar structures that will minimize contact
with precipitation (materials maintenance controls). If not stored in a location as described, secondary
containment will be required (materials maintenance). Any untreated runoff from these activities can be
detrimental to wildlife if not cleaned up.
5.10 ON-SITE WASTE MANAGEMENT PRACTICES
All large and heavy weighted waste piles (concrete chunks, excavated pipes, etc.) will be kept in neatly
grouped piles until the material is to be disposed of properly. These piles will be stored the shortest
duration possible and will be kept 50 feet from any drainage course or inlet (Administrative Control). All
dry waste will be maintained through dumpsters and monthly hauler removal (hauler will be notified if
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dumpster becomes full and hauled off as needed). Where available by the hauling company the
dumpster will be covered. If not practical or available by the haul company, an increased removal
schedule will be followed and the “Max fill line” on the dumpster will be strictly followed. Corners of the
dumpsters will be monitored for “Dumpster Juice” leaking into the soil in dry conditions and rain/melt off
conditions as well as looking for it mixing with the runoff. Dumpsters, like the waste piles, will be located
at least 50 feet from any drainage course or inlet. Workers will be sent around at the end of the day to
collect trash to prevent trash being left out overnight. No construction debris (including broken
concrete) will be buried on site.
5.11 CONCRETE TRUCK/EQUIPMENT WASHING
Concrete will be a portion of this project. It is anticipated that it will be used with the joints around the
manholes, pour in place inlets, curb and gutter installation, sidewalks and culvert construction. Pre mixed
concrete trucks will be used in this process and will be delivered to the site when pouring the culvert
components. Washing the concrete equipment will be required to maintain the equipment. This
concrete wash water has a high alkaline content which is hazardous to terrestrial and aquatic wildlife. A
section of dirt near the entrance will be excavated and compacted around the sides to retain the
concrete wash water on site, as an acceptable practice by the State, so long as the wash water is kept in
the washout (concrete washout). There will be a rock pad for the truck to park on while washing as to
prevent tracking from this washout (VTC). The placement of this washout will be located at least 50 feet
from any drainage course or inlet. Later in the project after the parking lots curb and gutter has been
poured a mobile washout facility will be used on site in a similar location after the ground has been
leveled (concrete washout – mobile). The contractor (including all masonry and concrete tradesmen)
shall clean out equipment within the washout area so that the runoff is not allowed to leave the
washout. The only exception would be for them to wash in the next day’s pour location. All concrete
workers will be made aware of where they are to wash (site management controls & education). If there
is a significant amount of spillage when the transfer from concrete truck to pump truck occurs, a tarp or
other ground cloth should be used to collect spillage (ground cover control).
5.12 DEDICATED ASPHALT AND CONCRETE BATCH PLANTS
There will be no dedicated asphalt or concrete batch plants erected onsite for this project. Premixed
concrete and paving materials will be delivered to the site and placed.
In the event that a plant is needed, the Contractor should be aware that additional permitting will be
required. In particular an Air Pollutant Emission Notice (APEN) will need to be obtained from the CDPHE.
5.13 NON-INDUSTRIAL WASTE SOURCES SUCH AS WORKER TRASH AND PORTABLE TOILETS
Since facilities are not located nearby for workers to use, trash and sanitary facilities will be required on
the site.
Worker trash will be combined with the industrial trash and will follow the same controls with the caveat
that a trashcan will be located near the entrance of the site as the contractor will need to dump their
trash from lunch, etc. and this will be emptied weekly or more frequently, if needed. Designate trash and
bulk waste collection areas on-site. Dumpsters should be located near site entrances to minimize traffic
on disturbed soils, and they should be placed on a level soil surface. When possible, materials should be
recycled. Hazardous material waste should be segregated from other solid waste.
If tipped over and when being cleaned, portable toilet facilities become a potential discharge if not
properly cleaned up. If human waste is spilled, it will need to be treated as a biological hazard of
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untreated sewage and will need to be cleaned up in accordance with Larimer County Health Department
Guidance. The toilets will be staked in a way to prevent tipping on a dirt surface and located at least 50
feet from a drainage course or inlet. If the site cannot accommodate a portable toilet on dirt, a
containment pan or other secondary containment will be provided. They will also be anchored to
prevent from tipping. All materials shall be properly disposed of in accordance with the law.
5.14 SAW CUTTING AND GRINDING
The trench work and street connections will require cutting into the city street. These saws generate a
significant amount of dust. Watering the cutting surface to prevent airborne particulates (BMP in the
City’s Fugitive Dust Manual) is required. The cutting slurry has a high content of fine particulates (Silica
Dust, Metals, etc.) that is not allowed to discharge as runoff from the site. To prevent slurry from
discharging offsite, contractors will use the minimum amount of water needed to prevent dust and
blades from overheating (site management control). Cutting slurry will be collected via vacuum or
allowed to dry out and be scraped and swept up after the cutting has finished (saw cutting).
The following protocol is recommended to prevent dust and slurry from asphalt and concrete saw
cutting activities from migrating into the existing storm drain system.
Slurry and cuttings shall be vacuumed during cutting and surfacing operations
Slurry and cuttings shall not remain on permanent concrete or asphalt pavement overnight
Slurry and cuttings shall not drain to any natural or constructed drainage conveyance
Collected slurry and cuttings shall be disposed of in a manner that does not violate groundwater or
surface water standards
5.15 MATERIAL HANDLING AND SPILL PREVENTION
Potential pollution sources, as discussed in earlier sections, are to be identified by the contractor. Spill
prevention procedures are to be determined and put in place before construction by the contractor. A
spill and flooding response procedure must also be determined and put in place before construction by
the contractor. Additionally, steps should be taken to reduce the potential for leaks and spills to come in
contact with stormwater run-off, such as storing and handling toxic materials in covered areas or storing
chemicals within berms or other secondary containment devices.
A notification procedure must be put in place by the contractor, by which workers would first notify the
site construction superintendent, who would then notify the SWMP Administrator. Depending on the
severity of the spill, the site construction superintendent and SWMP Administrator would possibly notify
the Colorado Department of Public Health and Environment - Water Quality Control Division,
downstream water users, or other appropriate agencies. The release of any chemical, oil, petroleum
product, sewage, etc., which enter waters of the State of Colorado (which include surface water,
groundwater, and dry gullies or storm sewers leading to surface water) must be reported
immediately to the Division’s emergency spill reporting line at (877) 518-5608. All spills requiring
cleanup, even if the spill is minor and does not need to be reported to the State, should still be reported
to the City of Fort Collins Utilities office at 970-221-6700.
It will be the responsibility of the Contractor to designate a fueling area and take the necessary
precautions to ensure that no stormwater pollution occurs in the event that a fueling area is needed.
Fueling areas shall be located a minimum 100 feet from all drainage courses. A 12-inch high compacted
earthen ridge capable of retaining potential spills shall enclose fueling areas. Other secondary
containment devices can be used instead of the earthen ridge. The area shall be covered with a non-
porous lining to prevent soil contamination. Printed instructions for cleanup procedures shall be posted
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in the fueling area and appropriate fuel absorbents shall be available along with containers for used
absorbents within the fueling area.
5.16 NON-STORMWATER DISCHARGES, INCLUDING CONSTRUCTION DEWATERING NOT
COVERED UNDER THE CONSTRUCTION DEWATERING DISCHARGES GENERAL PERMIT AND
WASH WATER THAT MAY CONTRIBUTE TO POLLUTANTS TO THE MS4
The Stormwater Construction Permit only covers discharges composed entirely of stormwater. The
discharge of pumped stormwater, ONLY, from excavations, ponds, depressions, etc. to surface waters, or
to a municipal storm sewer system is allowed by the Stormwater Construction Permit, as long as the
dewatering activity and associated BMPs are identified in the Stormwater Management Plan (SWMP) and
are implemented in accordance with the SWMP.
Aside from the exceptions noted above, non-stormwater discharges must be addressed in a separate
permit issued for that discharge. If groundwater is encountered, and dewatering is required, a
Construction Dewatering Permit must be acquired from the Colorado Department of Public Health and
Environment.
Ground water levels indicate that groundwater may be present during construction of underground
utilities at 10’ - 12’ deep. If encountered, dewatering activities may be required. Groundwater has in most
excavations mixed with the dirt and as they are pumped, will add an increased velocity out of the out-
flow end contributing to erosion and speeding the transport of the suspended sediment particles. Also,
construction dewatering activities must be identified in the Erosion Control Report if they are to be
infiltrated on site.
If the material is anticipated to be pumped to a stormwater conveyance the proper Construction
Dewatering Permit must be pulled from the State of Colorado. If pumping activities are to occur on the
site, the use of rock packs on the intake end of the pump will be used and a silt bag will be used on the
outflow end of the pump to reduce the silt and sediment from leaving the activity (dewatering Control
Measure). If these activities occur under a Dewatering Permit, water samples will be collected in
accordance with that permit.
6.0 STORMWATER MANAGEMENT CONTROLS
6.1 SWMP ADMINISTRATOR
A SWMP Administrator must be designated in conjunction with the Stormwater Permit. This person shall
be responsible for developing, implementing, maintaining, and revising the SWMP. The SWMP
Administrator will also be the contact for all SWMP-related issues and will be the person responsible for
the accuracy, completeness, and implementation of the SWMP. The Administrator should be a person
with the authority to adequately manage and direct day-to-day stormwater quality management
activities at the site.
The SWMP Administrator for this site is:
Name: (to be filled in by permittee)
Company: (to be filled in by permittee)
Phone: (to be filled in by permittee)
E-mail: (to be filled in by permittee)
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6.2 OWNER INFORMATION
Name: Spencer Long
Company: Realty Capital
Address: 909 Lake Carolyn Parkway, Suite 150
E-mail: spencer@realtycapital.com
6.3 BEST MANAGEMENT PRACTICES (BMPS) FOR STORMWATER POLLUTION PREVENTION
Beginning from mobilization, and throughout the entire construction of the project, erosion control
devices shall be installed to ensure minimal pollutant migration. These erosion control devices may be
installed in phases, or not at all, depending on actual conditions encountered at the site. It is the
responsibility of the Contractor to make the determination as to what practices should be employed and
when. In the event that a review agency deems BMPs to be insufficient, it shall be the responsibility of
the contractor to implement modifications as directed.
Best Management Practices (BMPs) are loosely defined as a method, activity, maintenance procedure, or
other management practice for reducing the amount of pollution entering a water body. The term
originated from rules and regulations in Section 208 of the Clean Water Act.
Details for Structural and Non-Structural BMPs have been included in Appendix B. These details should
be used for additional information on installation and maintenance of BMPs specified in this report. It is
also intended to serve as a resource for additional BMPs that may be appropriate for the site that have
not specifically been mentioned in the report.
6.4 STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL
Structural BMPs are physical devices that are implemented to prevent erosion from happening or to limit
erosion once it occurs. These devices can be temporary or permanent, and installation of individual
components will vary depending on the stage of construction.
A table depicting construction sequence and BMP application/removal has been placed on the “Dynamic
Site Plan” to help document the implementation of these BMPs. Refer to the Stormwater Management
Plan Static Site Plan in the Appendix for the assumed location of all BMPs. Construction Details for
Temporary BMPs are located in the Appendix for reference.
Again, the final determination for which BMP’s will be installed, where they will be located, and when
they will be installed shall be made by the Contractor, along with all documentation throughout the
construction process.
Silt Fencing (Phase I)
Silt fencing shall be provided to prevent migration of sediment off-site or into adjacent properties. All
silt fencing shall be installed prior to any land disturbing activity (demolition, stockpiling, stripping,
grading, etc.). Silt fencing is to be installed prior to site excavation or earthwork activities.
Inspections of the silt fence should identify tears or holes in the material and should check for slumping
fence or undercut areas that allow flows to bypass the fencing. Damaged sections of the silt fence
should be removed to maintain BMP effectiveness, typically before it reaches a depth of 6 inches.
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It is suggested that silt fencing be located along sections of the property line that drains to offsite
properties or Willow Street. Refer to the Erosion Control Plan (Sheet EC1) for additional clarification.
Sediment Control Log – aka “Straw Wattles” (Phase I)
A Sediment Control Log is a linear roll made of natural materials, such as straw, coconut fiber, or other
fibrous material trenched into the ground and held with a wooden stake. Sediment Control Logs can be
used in many instances. Examples include perimeter control for stockpiles, as part of inlet protection
designs, as check dams in small drainage ways, on disturbed slopes to shorten flow lengths, or in lieu of
silt fencing (where appropriate).
Sediment Control Logs should be inspected for excess sediment accumulation. Sediment should be
removed prior to reaching half the height of the log.
There are no Sediment Control Logs proposed with the Erosion Control plan, but at a minimum,
Sediment Control Logs should be used around soil stockpiles (including landscape material) and at all
stormwater discharge locations other than inlets.
Vehicle Tracking Control Pads (Phase I)
Vehicle tracking control pads shall be provided to minimize tracking of mud and sediment onto paved
surfaces and neighboring roadways. All vehicle tracking control pads shall be installed prior to any land
disturbing activity (demolition – as necessary, stockpiling, stripping, grading, etc.). Location of vehicle
tracking control pads will be located at any and all existing and future vehicle accesses being used
during any of the construction phases. These locations will primarily be dictated by gates or openings in
the temporary construction fencing that is expected to be installed. Vehicle tracking control pads are to
be installed prior to demolition (as appropriate), site excavation or earthwork activities.
Vehicle tracking pads should be inspected for degradation and aggregate material should be replaced as
needed. If the area becomes clogged with water, excess sediment should be removed. Aggregate
material should remain rough, and at no point should aggregate be allowed to compact in a manner that
causes the tracking pad to stop working as intended.
Suggested locations for vehicle tracking pads are at the proposed accesses on the northeast and
southeast ends of the project site, near the drive aisle entrances, during all phases of Erosion Control.
Refer to the Erosion Control Plan (Sheets EC1) for additional clarification.
Inlet Protection (Phase I & II)
Inlet protection shall be provided for existing inlets to prevent sediment transport from adjacent
earthwork disturbance. Installation of these filters shall occur before adjacent earth disturbing activities
(Phase I implementation). Wattle type filters are to be implemented for new and existing inlets where
asphalt does not exist. For these inlets, if pavement is constructed adjacent to the structure or if the area
adjacent to the inlet is changed such that the wattle type filter is no longer effective, it shall be the
responsibility of the Contractor to ensure that an appropriate method is used instead. For example, the
wattle filter could be reused, or a gravel-block inlet filter may be installed. It will be left to the discretion
of the Contractor as to whether replacement of any inlet filter is necessary.
Inlet protection should be inspected regularly for tears that can result in sediment entering an inlet. Inlet
protection should also be inspected for sediment accumulation upstream of the inlet, and sediment
should be removed when less than half of the capacity is available, or per manufacturer specifications.
Refer to the Erosion Control Plan (Sheet EC1) for additional clarification.
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Concrete Washout Area (Phase II)
A concrete washout should be provided on the site. The washout can be lined or unlined excavated pits
in the ground, commercially manufactured prefabricated containers, or aboveground holding areas. The
concrete washout must be located a minimum of 400 feet from any natural drainage way or body of
water, and at least 1000 feet from any wells or drinking water sources. Washout areas should not be
located in an area where shallow groundwater may be present. Contractor shall clearly show the desired
location and access to the Concrete Washout Area on the Stormwater Management Plan - Dynamic Site
Plan. Contractor shall place a Vehicle Tracking Pad if the selected location for the Concrete Washout
Area is detached from pavement. Clear signage identifying the concrete washout should also be
provided.
The Concrete Washout Area should be inspected regularly. Particular attention should be paid to
signage to ensure that the area is clearly marked. Confirmation that the washout is being used should
also be noted to ensure that other undesignated areas of the site are not being used incorrectly as a
concrete washout.
It is suggested that the contractor place concrete washout areas at the northeast side of the project site
near the site entrance. These locations are only a suggestion and can be relocated at the discretion of the
Contractor.
Permanent/Established Vegetation (Phase IV)
Permanent or established vegetation and landscaping is considered a permanent form of sediment and
erosion control for common open spaces, steep slopes and areas not exposed to prolonged scour
velocities, or acute incipient motion bed shear stresses that will create soil erosion, rill formation and
subsequent sediment transport. Areas where the previous conditions apply must contain sufficient
permanent BMPs, such as riprap or cobble mulch. Permanent vegetation shall conform to the approved
Landscape Plan prepared by Ripley Design. Permanent/Established vegetation and hardscape defines
Phase IV of development.
6.5 NON-STRUCTURAL PRACTICES FOR EROSION AND SEDIMENT CONTROL
Non-Structural BMPs are practices or activities that are implemented to prevent erosion from happening
or to limit erosion once it occurs. These BMPs can be a practice resulting in physical change to the site,
such as mulching or slope stabilization. They can also result in behavioral changes on the site, such as
changes to construction phasing to minimize exposure to weather elements, or increased employee
awareness gained through training.
Protection of Existing Vegetation (Phases I-IV)
Protection of existing vegetation on a construction site can be accomplished through installation of a
construction fence around the area requiring protection. In cases where up-gradient areas are disturbed,
it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas
such as wetlands.
Trees that are to remain after construction is complete must be protected. Most tree roots grow within
the top 12”-18” of soil, and soil compaction is a significant threat to tree health. As such, particular care
should be taken to avoid activities within the drip-line of the tree. Direct equipment damage should also
be prevented. The most effective way to ensure the health of trees is to establish a protection zone at
the drip-line of the tree to prevent unintended activity in the area directly surrounding the tree.
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Fencing should be inspected and repaired when needed. If damage occurs to a tree, an arborist should
be consulted on how to care for the tree. If a tree is damage beyond repair, the City Forester should be
consulted on remediation measures.
At a minimum, protect all trees identified for retention on the plans by Ripley Design.
Stockpile Management (Phases I-III)
Stockpile management should be utilized to minimize erosion and sediment transport from soil
stockpiles. In general, soil stockpiles should be located a minimum of 100 feet from any drainage way
and 50 feet from any storm sewer inlets. Where practical, choose a stockpile location that will remain
undisturbed for the longest period of time as the phases of construction progress. Sediment control
BMPs should be placed around the perimeter of the stockpile, and a designated access point on the
upstream side of the stockpile should be identified. BMPs such as surface roughening, temporary
seeding, mulching, erosion control blankets, or soil binders should be used to stabilize the stockpile
surface.
As a part of stockpile management, regular inspections of the perimeter controls should be completed.
If BMPs have been utilized to stabilize the surface of the stockpile, they should be inspected and repaired
as needed.
While soil stockpiles are not expected with this project, it is possible that foundation excavation or the
delivery of landscaping material may generate temporary stockpiles. The location of any such stockpiles
shall be the responsibility of the SWMP Administrator.
Mulching (Phase I-III)
Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration, and
reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it can
also be used for temporary stabilization of areas that cannot be reseeded due to seasonal constraints.
The most common type of mulch used is hay or grass that is crimped into the soil to keep it secure.
However, crimping may not be practical on slopes steeper than three to one (3H:1V).
The Contractor shall mulch all planted areas within twenty-four (24) hours after planting. Only weed-free
and seed-free straw mulch may be used. Straw mulch should be applied at two (2) tons per acre, and
shall be adequately secured by crimping, tackifier, netting or blankets. Hydraulic mulching may also be
used on steep slopes or where access is limited. In the case that hydraulic mulching is utilized, the
Contractor shall use wood cellulose fibers mixed with water at two thousands to two thousand five
hundred (2,000-2,500) pounds per acre and organic tackifier at one hundred to four hundred (100-400)
pounds per acre.
The Contractor is responsible for applying wood chip mulch to all planted trees and shrubs as shown on
the Landscape Plan prepared by Ripley Design.
Wind Erosion/Dust Control (Phase I-IV)
Wind Erosion and Dust Control BMP’s help to keep soil particles from entering the air as a result of land
disturbing construction activities. Attached at the end of the Appendix B is the Fort Collins Dust
Prevention and Control Manual. The purpose of this manual is to establish minimum requirements
consistent with nationally recognize BMP’s for controlling fugitive dust emissions and to describe
applicable best management practices to prevent, minimize, and mitigate off-property transport or off-
vehicle transport of fugitive dust emissions pursuant to Chapter 12, Article X of the Fort Collins City Code
(§12-150 et. seq) for specific dust generating activities and sources. Examples include use of a water truck
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or irrigation/sprinkler system to wet the top layer of disturbed soil, seeding and mulching, soil binders, or
wind fences.
Please refer to the last three pages of Appendix B for the Dust Control Plan. A Dust Control Plan is
required for all development projects or construction sites with greater than five (5) acres in size.
Street Sweeping (Phases I -IV)
Street sweeping should be used to remove sediment that has been tracked onto adjacent roadways.
Roadways should be inspected at least once a day, and sediment should be removed as needed. A check
of the area inlet protection should be completed after sweeping to ensure nothing was displaced during
sweeping operations. Street sweeping can reduce the sediment washed into the existing storm drain
system. Street sweeping may be necessary on the existing hardscape areas which receive runoff from the
disturbed areas.
Good Housekeeping Practices (All phases)
Good housekeeping practices that will prevent pollution associated with solid, liquid, and hazardous
construction-related materials and wastes should be implemented throughout the project. Examples of
good housekeeping include providing an appropriate location for waste management containers,
establishing proper building material staging areas, designating paint and concrete washout areas,
establishing proper equipment/vehicle fueling and maintenance practices. Development of a spill
prevention and response plan is another example of good housekeeping practices that should be used
on the project. The following items are detailed examples of some of the good housekeeping practices
that should be utilized throughout the project. It should be noted that a complete list of practices and
detailed discussion regarding good housekeeping has been included within the Potential Pollution
Sources section of this report.
Street Sweeping and Vacuuming – Street sweeping and vacuuming should be used to remove sediment
that has been tracked onto adjacent roadways. Roadways should be inspected at least once a day, and
sediment should be removed as needed. A check of inlet protection should be completed after
sweeping to ensure nothing was displaced during sweeping operations.
Waste Management – Designate trash and bulk waste collection areas on-site. When possible, materials
should be recycled. Hazardous material waste should be segregated from other solid waste. Waste
collection areas should be located away from streets, gutters, watercourses, and storm drains.
Dumpsters should be located near site entrances to minimize traffic on disturbed soils, and they should
be placed on a level soil surface.
Establish Proper Building Material Handling and Staging areas – Clearly designate site areas for staging and
storage of building materials. Provide appropriate BMPs to ensure that spills or leaks are contained.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices – If needed, create a clearly
designated on-site fueling and maintenance area that is clean and dry. Provide appropriate BMPs to
ensure that spills or leaks are contained.
6.6 PHASED BMP INSTALLATION
It is important to recognize the four (4) major Development Phases as defined by the State of Colorado’s
Stormwater Discharge Permit (SDP). These four development phases (referred to as Sequencing by the
City of Fort Collins) have been distinguished to aid in the appropriate timing of installation/
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implementation of BMPs at different stages of the construction process. These phases are described as
follows:
Phase I – Demolition Stage; BMPs for initial installation of perimeter controls
Phase II – Infrastructure Stage; BMPs for utility, paving, and curb installation
Phase III – Vertical Construction Stage; BMPs for individual building construction.
Phase IV – Permanent BMPs and final site stabilization.
The following is a rough estimate of the anticipated construction sequence for site improvements. The
schedule outlined below is subject to change as the project progresses and as determined by the
General Contractor.
Table 1 – Preliminary Permit and Construction Schedule
Included in the back map pockets are two Site Plans: a “Static” Site Plan and a “Dynamic” Site Plan. The
“Static” plan serves to display the overall management plan all at once. However, proper implementation
of BMPs does not occur at once, and certain BMPs may move location in the construction process;
therefore, the “Dynamic” Site Plan is intended for the contractor to write in the BMP symbols to
document the location and time the BMPs are installed and maintained throughout the entire
construction process.
6.7 BMP INSPECTION
All temporary erosion control facilities shall be inspected at a minimum of once every two (2) weeks and
after each significant storm event or snowmelt. Repairs or reconstruction of BMPs, as necessary, shall
occur as soon as possible to ensure the continued performance of their intended function. It is the
responsibility of the SWMP Administrator to conduct bi-weekly inspections, maintain BMPs if needed,
keep records of site conditions and inspections, and update the SWMP as necessary.
The construction site perimeter, disturbed areas, all applicable/installed erosion and sediment control
measures, and areas used for material storage exposed to precipitation shall be inspected for evidence
of, or the potential for, pollutants entering the drainage system. Erosion and sediment control measures
identified in the SWMP shall be observed to ensure they are operating correctly. Attention should be
paid to areas with a significant potential for stormwater pollution, such as demolition areas, concrete
washout locations, and vehicle entries to the site. The inspection must be documented to ensure
compliance with the permit requirements.
TASK BEGINNING
DATE ENDING DATE "BMP-PHASE OF
DEVELOPMENT"
Development Construction Permit
Issued by City of Fort Collins Feb. 2026 April 2026 I
Overlot Grading (Demolition)March 2026
April 2026
I
Utility Installation April 2026 May 2026 II
Road Construction May 2026 June 2026 III
Final Stabilization June 2026 July 2026 IV
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6.8 BMP MAINTENANCE
Any BMPs not operating in accordance with the SWMP must be addressed as soon as possible,
immediately in most cases, to prevent the discharge of pollutants. If modifications are necessary, such
modifications shall be documented so that the SWMP accurately reflects on-site conditions. The SWMP
needs to accurately represent field conditions at all times.
Uncontrolled releases of mud, muddy water, or measurable amounts of sediment found offsite will be
recorded with a brief explanation of the measures taken to clean up the sediment that has left the site, as
well as the measures taken to prevent future releases. This record shall be made available to the
appropriate public agencies (Colorado Department of Public Health and Environment, Water Quality
Control Division; Environmental Protection Agency; City of Fort Collins; etc.) upon request.
Preventative maintenance of all temporary and permanent erosion control BMPs shall be provided to
ensure the continued performance of their intended function. Temporary erosion control measures are
to be removed after the site has been sufficiently stabilized, as determined by the City of Fort Collins.
Maintenance activities and actions to correct problems shall be noted and recorded during inspections.
Inspection and maintenance procedures specific to each BMP identified with this SWMP are discussed in
Section 3. Details have also been included in Appendix B.
6.9 RECORD KEEPING
Documentation of site inspections must be maintained. The following items are to be recorded and kept
with the SWMP:
Date of Inspection
Name(s) and title(s) of personnel making the inspection
Location(s) of sediment discharges 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
Locations(s) where additional BMPs are needed that were not in place at the time of inspection
Deviations from the minimum inspection schedule
Descriptions of corrective action taken to remedy deficiencies that have been identified
The report shall contain a signed statement indicating the site is in compliance with the permit to
the best of the signer’s knowledge and belief after corrective actions have been taken.
Provided within Appendix E of this SWMP is an Example Inspection Log to aid in the record keeping of
BMP inspections and maintenance. Photographs, field notebooks, drawings, and maps should be
included by the SWMP Administrator when appropriate.
In addition to the Inspection Log, records should be kept documenting:
BMP maintenance and operation
Stormwater contamination
Contacts with suppliers
Notes on the need for and performance of preventive maintenance and other repairs
Implementation of specific items in the SWMP
Training events (given or attended)
Events involving materials handling and storage
Contacts with regulatory agencies and personnel
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Notes of employee activities, contact, notifications, etc.
Records of spills, leaks, or overflows that result in the discharge of pollutants must be documented and
maintained. A record of other spills responded to, even if they do not result in a discharge of pollutants,
should be made. Information that should be recorded for all occurrences includes the time and date,
weather conditions, reasons for the spill, etc. Some spills may need to be reported to authorities
immediately. Specifically, a release of any chemical, oil, petroleum product, sewage, etc., which may
enter waters of the State of Colorado (which include surface water, groundwater, and dry gullies or storm
sewers leading to surface water) must be reported to the CDPHE.
Additionally, the “Dynamic Site Plan” is intended to be a “living” document where the SWMP
Administrator can handwrite the location of BMPs as they are installed to appropriately reflect the
current site conditions. Also on the “Dynamic Site Plan” is a “Table of Construction Sequence and BMP
Application/Removal” the SWMP Administrator can use to document when BMPs were installed or
removed in conjunction with construction activities. These items have been included as an aid to the
SWMP Administrator, and other methods of record keeping are at his or her discretion.
This Stormwater Management Plan (both the text and map) is not a static document. It is a
dynamic device intended to be kept current and logged as construction occurs. It shall be the
responsibility of the SWMP Administrator and/or the permit holder (or applicant thereof) to
ensure the plan is properly maintained and followed. Diligent administration is critical, including
processing the Notice to Proceed and noting on the Stormwater Management Plan the dates that
various construction activities occur and respective BMPs are installed and/or removed.
7.0 FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT
7.1 FINAL STABILIZATION
Final stabilization of the site will be achieved by mulched shrub beds. All disturbed areas will be seeded,
crimped, and mulched within 24 hours of seeding per the FCDCM Chapter 2 Section 6.1.4.9. Non-seed
stabilization is expected to be completed soon after hardscape construction is complete. Please refer to
the landscaping plans for more information.
Soil amendments such as compost, peat, aged manure, or other similar materials shall also be utilized.
Soil amendments shall be tilled into the soil to a minimum depth of 6” and should comply with the
requirements found in City Code Section 12-132 (also refer to Land Use Code 3.8.21).
As defined by the Colorado Department of Public Health and Environment (CDPHE) in the General Permit
Application for Stormwater Discharges, “Final stabilization is reached when all soil disturbing activities at
the site have been completed, and uniform vegetative cover has been established with a density of at
least 70 percent of pre-disturbance levels or equivalent permanent, physical erosion reduction methods
have been employed.” Establishment of 70 percent is required for a determination for project closure by
the City of Fort Collins.
7.2 LONG-TERM STORMWATER MANAGEMENT
The primary method of long-term stormwater management will be underground infiltration chambers.
The underground chambers will remove suspended sediment and pollutants from developed run-off
before entering drainage facilities downstream of the site.
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After stabilization, before project closure, all sediment shall be removed from storm piping per FCDCM
Chapter 2 Section 6.1.4.9.
All disturbed areas will receive permanent paving or be vegetated per the Landscape Plan. Low Impact
Development (LID) treatment will provide significant water quality enhancement and will serve the long-
term stormwater management goals for this project.
8.0 ADDITIONAL SWMP AND BMP RESOURCES
Mile High Flood District
Urban Storm Drainage Criteria Manual - Volume 3 “Best Management Practices”
Colorado Department of Transportation
Erosion Control and Stormwater Quality Guide
BMP Field Academy
EPA Menu of BMPs
Construction Site Storm Water Runoff Control
International Stormwater Best Management (BMP) Database
Rocky Mountain Education Center
Rocky Mountain Education Center
Red Rocks Community College, Lakewood
Keep It Clean Partnership
Boulder
9.0 REFERENCES
1. Final Drainage Report for The Linden, EPS Group Inc., May 21, 2025 (NE Project No. 24-0122)
2. City of Fort Collins Landscape Design Guidelines for Stormwater and Detention Facilities, November 5,
2009, BHA Design, Inc. with City of Fort Collins Utility Services.
3. Fort Collins Stormwater Criteria Manual, City of Fort Collins, Colorado, adopted by Ordinance No. 174,
2011, and referenced in Section 26-500 (c) of the City of Fort Collins Municipal Code
4. Larimer County Urban Area Street Standards, Adopted January 2, 2001, Repealed and Reenacted,
Effective October 1, 2002, Repealed and Reenacted, Effective April 1, 2007
5. Soil Resource Report for Larimer County Area, Colorado, Natural Resources Conservation Service, United
States Department of Agriculture.
6. Urban Storm Drainage Criteria Manual, Volumes 1-3, Mile High Flood Control District, Wright-
McLaughlin Engineers, Denver, Colorado, Revised April 2008.
`
EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX A
SITE MAPS
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BUILDING 1
BUILDING 2
GODINEZ DOROTHY
400 LINDEN STREET
FORT COLLINS, CO
RIDLEY USA INC
416 LINDEN STREET
FORT COLLINS, CO
LIN
D
E
N
S
T
R
E
E
T
WILL
O
W
S
T
R
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E
T
MAWSON LLC
350 LINDEN STREET
FORT COLLINS, CO
359 LLC
359 LINDEN STREET
FORT COLLINS, CO
MAWSON LLC
115 LINCOLN AVENUE
FORT COLLINS, CO
RIDLEY USA INC
546 WILLOW STREET
FORT COLLINS, CO
LIN
C
O
L
N
A
V
E
N
U
E
WILL
O
W
S
T
R
E
E
T
EX. 10' US WEST COMMUNICATIONS
EASEMENT (RECEPTION NO. 94036924)
17' UE
24' EAE,
DE, & UE
24' EAE,
DE, & UE
24' EAE,
DE, & UE
24' EAE,
DE, & UE
30' DE
26' EAE,
DE, & UE
3' UE
3' UE
10' UE
8'
DE
5'
UE
10' UE
10'
UE
10' UE
10'
UE
3' UE
13' DE
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
NORTH
( IN FEET )
1 inch = ft.
Feet04040
40
80 120
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
BENCHMARK/BASIS OF BEARING:
BENCHMARK: #1
City of Fort Collins Benchmark 03-00
On a parapet wall at the Northwest end of the Lincoln Ave. Bridge near the
Northeast corner of Lincoln Ave. and Willow St.
Elevation=4967.33
BENCHMARK: #2
City of Fort Collins Benchmark 05-00
On the top of curb at the signal pole base at the Northwest corner of Linden St.
and Jefferson. St.
Elevation=4978.05
Please Note: This plan set is using NAVD88 for a vertical datum.
Surrounding developments have used NGVD29 unadjusted datum (prior
city of Fort Collins datum) for their vertical datums.
If NGVD29 unadjusted datum (prior city of Fort Collins datum) is required
for any purpose, the following equation should be used: NGVD29
unadjusted datum (prior city of Fort Collins datum) = NAVD88 - 3.18'
Basis of Bearings
The basis of bearings is the southwesterly line of Willow Street adjacent to
Blocks 8 and 9, City of Fort Collins, as bearing south 40°38'20” east, with the
most northerly corner of said Block 8, monumented as a #4 rebar with a 1"
yellow plastic cap, LS 14823 and the most easterly corner of said block 9,
monumented as a #4 rebar with 1" blue plastic cap, PLS 38470 and with all
bearings contained herein relative thereto.
SILT FENCE
ROCK SOCK
1.CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED
AREAS BY SEED & CRIMP MULCHING OR SIMILAR METHODS.
2.SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
3.CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR
CONCRETE WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4.REFER TO THE THE LINDEN FINAL DRAINAGE REPORT, DATED
JULY 14, 2025 BY EPS GROUP INC. FOR ADDITIONAL
INFORMATION.
5.THE CONTRACTOR SHALL INSTALL LANDSCAPE AS SHOWN ON
THE APPROVED LANDSCAPE PLANS AS WELL AS RE-ESTABLISH
UNIFORM VEGETATIVE COVER IN ALL OTHER DISTURBED AREAS
PER THE REQUIREMENTS OF THE PERMIT AND TO AT LEAST 70%
OF PRE-DISTURBANCE LEVEL UTILIZING STANDARD NATIVE
SEEDING MIXTURE OF THE JURISDICTION HAVING AUTHORITY.
GENERAL NOTES:
CONCRETE WASH AREA
LEGEND:
INLET PROTECTION
VEHICLE TRACKING CONTROL PAD
SF
KEYMAP
28
EROSION CONTROL NOTES:
1.IT SHOULD BE NOTED THAT ANY EROSION CONTROL PLAN SERVES ONLY AS A GUIDELINE TO THE
CONTRACTOR. STAGING AND/OR PHASING OF BEST MANAGEMENT PRACTICES (BMPs) IS EXPECTED.
ADDITIONAL AND/OR DIFFERENT BMPs FROM THOSE ORIGINALLY DEPICTED MAY BE NECESSARY DURING
CONSTRUCTION DUE TO CHANGING SITE CONDITIONS OR AS REQUIRED BY LOCAL AUTHORITIES.
2.THIS EROSION CONTROL PLAN IS SCHEMATIC IN NATURE. AS SUCH, GRAPHICAL SYMBOLS MAY NOT BE
TO SCALE, NOR ARE THEY NECESSARILY SHOWN IN THEIR EXACT LOCATION.
3.THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING (CITY, STATE DISCHARGE PERMIT,
ETC.) AND COMPLIANCE WITH GOVERNING AUTHORITIES. IT SHALL BE THE RESPONSIBILITY OF THE
CONTRACTOR (OR PERMIT HOLDER) TO ENSURE EROSION CONTROL MEASURES ARE PROPERLY
MAINTAINED AND FOLLOWED.
4.CONTRACTOR SHALL IMPLEMENT THE APPROPRIATE EROSION CONTROL MEASURES ACCORDING TO THE
CONSTRUCTION SEQUENCING AND LEVEL OF SITE STABILIZATION.
5.CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR ALL STORM DRAINS, SWALES,
UNTIL SITE IS FULLY STABILIZED.
6.CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR DOWNSPOUT CONNECTIONS,
TO THE STORM DRAIN SYSTEM, UNTIL CONNECTION IS ESTABLISHED WITH DOWNSPOUT.
7.INLET PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE SURROUNDING SURFACE TYPE AND
CONDITION (i.e., STAKE-DRIVEN WATTLES FOR BARE SOIL, GRAVEL SOCKS FOR PAVEMENT, ETC.)
8.CONTRACTOR IS RESPONSIBLE FOR STABILIZING ALL SLOPES, PARTICULARLY THOSE STEEPER THAN 6:1.
CRIMP MULCHING, HYDRO MULCHING, EROSION MATS, TEMPORARY IRRIGATION, AND ADDITIONAL
WATTLES OR SILT FENCING MAY BE NECESSARY TO ESTABLISH VEGETATIVE COVER AND STABILIZE THE
SLOPE.
9.CONTRACTOR IS RESPONSIBLE FOR PREVENTING SEDIMENT FROM UNSTABILIZED LANDSCAPE AREAS
FROM MIGRATING ONTO AND ENTERING THE RAIN GARDEN SYSTEMS UNTIL UPGRADIENT TRIBUTARY
AREAS ARE FULLY STABILIZED.
10.ADDITIONAL WATTLES, SILT FENCE, OR OTHER MEASURES, MAY BE NECESSARY TO ENSURE THAT EACH
BUILDING PAD IS STABILIZED THROUGHOUT CONSTRUCTION. WATTLES SHALL BE PROVIDED AROUND
BUILDING PAD SIDES TO ENSURE AT NO TIME SHALL SEDIMENT BE ALLOWED TO CROSS THE PUBLIC
SIDEWALKS.
11.CONTRACTOR SHALL IMPLEMENT APPROPRIATE PERIMETER PROTECTION FOR AREAS DIRECTING
DRAINAGE OFFSITE. PERIMETER PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE
SURROUNDING SURFACE TYPE AND CONDITION (i.e., STAKE-DRIVEN SEDIMENT CONTROL LOGS OR SILT
FENCE FOR BARE SOIL, GRAVEL SOCKS FOR PAVEMENT, ETC.)
12.FUELING FACILITIES SHALL BE LOCATED AT LEAST ONE HUNDRED (100) FEET FROM NATURAL BODY OF
WATER, WETLAND, NATURAL DRAINAGE WAY OR MANMADE DRAINAGE WAY. THE FUEL TANKS AND
FUELING AREA MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW A FUEL SPILL TO DIRECTLY
FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF WATER, WETLAND OR DRAINAGE WAY.
13.CONSTRUCTION WASTE STORAGE (DUMPSTERS) AND PORTABLE SANITATION UNITS (CONSTRUCTION
TOILETS) SHALL BE LOCATED AT LEAST FIFTY (50) FEET FROM ANY STORMWATER INLET, WETLAND, OR
DRAINAGE WAY. SAID FACILITIES MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW
POLLUTANTS TO DIRECTLY FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF WATER, WETLAND
OR DRAINAGE WAY. DUMPSTERS SHALL BE LOCATED ON FLAT, STABLE GROUND, AND CONSTRUCTION
TOILETS SHALL BE STAKED DOWN.
14.THE CONTRACTOR AND ALL SUBCONTRACTORS WILL COOPERATE WITH THE TOWN'S CONSTRUCTION
INSPECTORS BY CEASING OPERATIONS WHEN WINDS ARE OF SUFFICIENT VELOCITY TO CREATE
BLOWING DUST WHICH, IN THE INSPECTOR'S OPINION, IS HAZARDOUS TO THE PUBLIC HEALTH AND
WELFARE.
15.WHERE SEASONAL CONSTRAINTS (E.G., DURING SUMMER AND WINTER MONTHS) INHIBIT PERMANENT
SEEDING OPERATIONS, DISTURBED AREAS WILL BE TREATED WITH MULCH AND MULCH TACKIFIER OR
OTHER MATERIALS APPROVED BY EROSION CONTROL STAFF TO PREVENT EROSION.
16.SEE LANDSCAPE PLANS FOR ADDITIONAL INFORMATION ON PLANTING, REVEGETATION, HARDSCAPE AND
OTHER PERMANENT SITE STABILIZATION METHODS.
17.DIRT AND DEBRIS FROM CONSTRUCTION ACTIVITIES TRACKED ON CITY STREETS SHALL BE KEPT TO A
MINIMUM AND CLEANED IMMEDIATELY OR AT THE SUGGESTION OF THE CITY'S EROSION CONTROL
INSPECTOR.
18.CONTRACTOR SHALL KEEP CONSTRUCTION VEHICLES ENTERING AND EXITING SITE TO A MINIMUM.
19.SEE C2006 FOR CITY OF FORT COLLINS STANDARD EROSION CONTROL NOTES.
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: THE LINDEN
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION
VERTICAL
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that
could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Riprap
Sheet
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CALCULATIONS CHART
TOTAL DISTURBED PROJECT AREA 2.72 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 2.20 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.52 ACRES
TOTAL STORAGE/STAGING AREA 0.1 ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 100%
EST. PERCENT VEGETATIVE COVER 10%DENSITY
EXISTING SOIL TYPE A
APPROX. GROUNDWATER DEPTH 12 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS 500 (-)CU. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE 0 SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA 250 FEET
D
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F.O.VAULT
AC
ACAC
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R R
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TF
BUILDING 1
BUILDING 2
10' UTILITY
EASEMENT
17' UTILITY
EASEMENT
30' DRAINAGE
EASEMENT
24' EMERGENCY
ACCESS EASEMENT
24' DRIVE AISLE
10' UTILITY
EASEMENT
26' EMERGENCY
ACCESS EASEMENT
24' EMERGENCY
ACCESS EASEMENT
GODINEZ DOROTHY
400 LINDEN STREET
FORT COLLINS, CO
RIDLEY USA INC
416 LINDEN STREET
FORT COLLINS, CO
LIN
D
E
N
S
T
R
E
E
T
WILL
O
W
S
T
R
E
E
T
MAWSON LLC
350 LINDEN STREET
FORT COLLINS, CO
359 LLC
359 LINDEN STREET
FORT COLLINS, CO
MAWSON LLC
115 LINCOLN AVENUE
FORT COLLINS, CO
RIDLEY USA INC
546 WILLOW STREET
FORT COLLINS, CO
LIN
C
O
L
N
A
V
E
N
U
E
WILL
O
W
S
T
R
E
E
T
DRAINAGE
EASEMENT
30' DRAINAGE EASEMENT
BY SEPARATE DOCUMENT
REC NO. _______________
UTILITY EASEMENT BY
SEPARATE DOCUMENT
REC NO. ____________
26' DRIVE
AISLE
26' EMERGENCY
ACCESS EASEMENT
EX. 10' US WEST COMMUNICATIONS
EASEMENT (RECEPTION NO. 94036924)
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
NORTH
( IN FEET )
1 inch = ft.
Feet04040
40
80 120
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
BENCHMARK/BASIS OF BEARING:
BENCHMARK: #1
City of Fort Collins Benchmark 03-00
On a parapet wall at the Northwest end of the Lincoln Ave. Bridge near the
Northeast corner of Lincoln Ave. and Willow St.
Elevation=4967.33
BENCHMARK: #2
City of Fort Collins Benchmark 05-00
On the top of curb at the signal pole base at the Northwest corner of Linden St.
and Jefferson. St.
Elevation=4978.05
Please Note: This plan set is using NAVD88 for a vertical datum.
Surrounding developments have used NGVD29 unadjusted datum (prior
city of Fort Collins datum) for their vertical datums.
If NGVD29 unadjusted datum (prior city of Fort Collins datum) is required
for any purpose, the following equation should be used: NGVD29
unadjusted datum (prior city of Fort Collins datum) = NAVD88 - 3.18'
Basis of Bearings
The basis of bearings is the southwesterly line of Willow Street adjacent to
Blocks 8 and 9, City of Fort Collins, as bearing south 40°38'20” east, with the
most northerly corner of said Block 8, monumented as a #4 rebar with a 1"
yellow plastic cap, LS 14823 and the most easterly corner of said block 9,
monumented as a #4 rebar with 1" blue plastic cap, PLS 38470 and with all
bearings contained herein relative thereto.
SILT FENCE
ROCK SOCK
1.CONTRACTOR SHALL IMMEDIATELY STABILIZE ALL DISTURBED
AREAS BY SEED & CRIMP MULCHING OR SIMILAR METHODS.
2.SWMP ADMINISTRATOR:
Contact ________________________________
Company ________________________________
Address ________________________________
Phone________________________________
3.CONTRACTOR TO PROVIDE VEHICLE TRACKING CONTROL FOR
CONCRETE WASHOUT AREA IF ACCESS IS OFF PAVEMENT.
4.REFER TO THE THE LINDEN FINAL DRAINAGE REPORT, DATED
MAY 21, 2025 BY EPS GROUP INC. FOR ADDITIONAL
INFORMATION.
5.THE CONTRACTOR SHALL INSTALL LANDSCAPE AS SHOWN ON
THE APPROVED LANDSCAPE PLANS AS WELL AS RE-ESTABLISH
UNIFORM VEGETATIVE COVER IN ALL OTHER DISTURBED AREAS
PER THE REQUIREMENTS OF THE PERMIT AND TO AT LEAST 70%
OF PRE-DISTURBANCE LEVEL UTILIZING STANDARD NATIVE
SEEDING MIXTURE OF THE JURISDICTION HAVING AUTHORITY.
GENERAL NOTES:
CONCRETE WASH AREA
LEGEND:
INLET PROTECTION
VEHICLE TRACKING CONTROL PAD
SF
KEYMAP
26
EROSION CONTROL NOTES:
1.IT SHOULD BE NOTED THAT ANY EROSION CONTROL PLAN SERVES ONLY AS A GUIDELINE TO THE
CONTRACTOR. STAGING AND/OR PHASING OF BEST MANAGEMENT PRACTICES (BMPs) IS EXPECTED.
ADDITIONAL AND/OR DIFFERENT BMPs FROM THOSE ORIGINALLY DEPICTED MAY BE NECESSARY DURING
CONSTRUCTION DUE TO CHANGING SITE CONDITIONS OR AS REQUIRED BY LOCAL AUTHORITIES.
2.THIS EROSION CONTROL PLAN IS SCHEMATIC IN NATURE. AS SUCH, GRAPHICAL SYMBOLS MAY NOT BE
TO SCALE, NOR ARE THEY NECESSARILY SHOWN IN THEIR EXACT LOCATION.
3.THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITTING (CITY, STATE DISCHARGE PERMIT,
ETC.) AND COMPLIANCE WITH GOVERNING AUTHORITIES. IT SHALL BE THE RESPONSIBILITY OF THE
CONTRACTOR (OR PERMIT HOLDER) TO ENSURE EROSION CONTROL MEASURES ARE PROPERLY
MAINTAINED AND FOLLOWED.
4.CONTRACTOR SHALL IMPLEMENT THE APPROPRIATE EROSION CONTROL MEASURES ACCORDING TO THE
CONSTRUCTION SEQUENCING AND LEVEL OF SITE STABILIZATION.
5.CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR ALL STORM DRAINS, SWALES,
UNTIL SITE IS FULLY STABILIZED.
6.CONTRACTOR SHALL IMPLEMENT APPROPRIATE INLET PROTECTION FOR DOWNSPOUT CONNECTIONS,
TO THE STORM DRAIN SYSTEM, UNTIL CONNECTION IS ESTABLISHED WITH DOWNSPOUT.
7.INLET PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE SURROUNDING SURFACE TYPE AND
CONDITION (i.e., STAKE-DRIVEN WATTLES FOR BARE SOIL, GRAVEL SOCKS FOR PAVEMENT, ETC.)
8.CONTRACTOR IS RESPONSIBLE FOR STABILIZING ALL SLOPES, PARTICULARLY THOSE STEEPER THAN 6:1.
CRIMP MULCHING, HYDRO MULCHING, EROSION MATS, TEMPORARY IRRIGATION, AND ADDITIONAL
WATTLES OR SILT FENCING MAY BE NECESSARY TO ESTABLISH VEGETATIVE COVER AND STABILIZE THE
SLOPE.
9.CONTRACTOR IS RESPONSIBLE FOR PREVENTING SEDIMENT FROM UNSTABILIZED LANDSCAPE AREAS
FROM MIGRATING ONTO AND ENTERING THE RAIN GARDEN SYSTEMS UNTIL UPGRADIENT TRIBUTARY
AREAS ARE FULLY STABILIZED.
10.ADDITIONAL WATTLES, SILT FENCE, OR OTHER MEASURES, MAY BE NECESSARY TO ENSURE THAT EACH
BUILDING PAD IS STABILIZED THROUGHOUT CONSTRUCTION. WATTLES SHALL BE PROVIDED AROUND
BUILDING PAD SIDES TO ENSURE AT NO TIME SHALL SEDIMENT BE ALLOWED TO CROSS THE PUBLIC
SIDEWALKS.
11.CONTRACTOR SHALL IMPLEMENT APPROPRIATE PERIMETER PROTECTION FOR AREAS DIRECTING
DRAINAGE OFFSITE. PERIMETER PROTECTION SHALL BE ADAPTED, AS NECESSARY, TO THE
SURROUNDING SURFACE TYPE AND CONDITION (i.e., STAKE-DRIVEN SEDIMENT CONTROL LOGS OR SILT
FENCE FOR BARE SOIL, GRAVEL SOCKS FOR PAVEMENT, ETC.)
12.FUELING FACILITIES SHALL BE LOCATED AT LEAST ONE HUNDRED (100) FEET FROM NATURAL BODY OF
WATER, WETLAND, NATURAL DRAINAGE WAY OR MANMADE DRAINAGE WAY. THE FUEL TANKS AND
FUELING AREA MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW A FUEL SPILL TO DIRECTLY
FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF WATER, WETLAND OR DRAINAGE WAY.
13.CONSTRUCTION WASTE STORAGE (DUMPSTERS) AND PORTABLE SANITATION UNITS (CONSTRUCTION
TOILETS) SHALL BE LOCATED AT LEAST FIFTY (50) FEET FROM ANY STORMWATER INLET, WETLAND, OR
DRAINAGE WAY. SAID FACILITIES MUST BE SET IN A CONTAINMENT AREA THAT WILL NOT ALLOW
POLLUTANTS TO DIRECTLY FLOW, SEEP, RUN OFF, OR BE WASHED INTO A BODY OF WATER, WETLAND
OR DRAINAGE WAY. DUMPSTERS SHALL BE LOCATED ON FLAT, STABLE GROUND, AND CONSTRUCTION
TOILETS SHALL BE STAKED DOWN.
14.THE CONTRACTOR AND ALL SUBCONTRACTORS WILL COOPERATE WITH THE TOWN'S CONSTRUCTION
INSPECTORS BY CEASING OPERATIONS WHEN WINDS ARE OF SUFFICIENT VELOCITY TO CREATE
BLOWING DUST WHICH, IN THE INSPECTOR'S OPINION, IS HAZARDOUS TO THE PUBLIC HEALTH AND
WELFARE.
15.WHERE SEASONAL CONSTRAINTS (E.G., DURING SUMMER AND WINTER MONTHS) INHIBIT PERMANENT
SEEDING OPERATIONS, DISTURBED AREAS WILL BE TREATED WITH MULCH AND MULCH TACKIFIER OR
OTHER MATERIALS APPROVED BY EROSION CONTROL STAFF TO PREVENT EROSION.
16.SEE LANDSCAPE PLANS FOR ADDITIONAL INFORMATION ON PLANTING, REVEGETATION, HARDSCAPE AND
OTHER PERMANENT SITE STABILIZATION METHODS.
17.DIRT AND DEBRIS FROM CONSTRUCTION ACTIVITIES TRACKED ON CITY STREETS SHALL BE KEPT TO A
MINIMUM AND CLEANED IMMEDIATELY OR AT THE SUGGESTION OF THE CITY'S EROSION CONTROL
INSPECTOR.
18.CONTRACTOR SHALL KEEP CONSTRUCTION VEHICLES ENTERING AND EXITING SITE TO A MINIMUM.
19.SEE C2006 FOR CITY OF FORT COLLINS STANDARD EROSION CONTROL NOTES.
TABLE OF CONSTRUCTION SEQUENCE AND BMP APPLICATION
Project: THE LINDEN
CONSTRUCTION PHASE MOBILIZATION DEMOLITION GRADING
BEST MANAGEMENT PRACTICES (BMPS)
STRUCTURAL "INSTALLATION"
Silt Fence Barriers *
Flow Barriers (Wattles) *
Inlet Filter Bags *
Vegetative
Temporary Seeding Planting
Mulching / Sealant
Permanent Seeding Planting
Sod Installation
Contour Furrows (Ripping / Disking)
Rock Bags *
UTILITIES
INSTALLATION
FLAT WORK
INSTALLATION
VERTICAL
INSTALLATION LANDSCAPE DEMOBILIZATION
Vehicle Tracking Pad *
* All Temporary BMPs to be Removed once Construction is Complete
Any prior inlets that
could use protecting
Anytime the site will sit dormant longer than 30 Days
Anytime the site will sit dormant longer than 30 Days
Riprap
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TOTAL DISTURBED PROJECT AREA 2.72 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 2.20 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 0.52 ACRES
TOTAL STORAGE/STAGING AREA 0.1 ACRES
TOTAL HAUL ROADS AREA N/A
CONSTRUCTION VEHICLE TRAFFIC AREA N/A
EST. PERCENT OF PROJECT AREA EXPOSED 100%
EST. PERCENT VEGETATIVE COVER 10%DENSITY
EXISTING SOIL TYPE A
APPROX. GROUNDWATER DEPTH 12 FEET
NUMBER OF PHASES W/ PROJECT N/A
TOTAL VOLUME OF IMPORTED (+) / EXPORTED (-) MATERIALS 500 (-)CU. YD.
TOTAL AREA OF STOCKPILING OF FILL OR BORROW AREAS OFF SITE 0 SQ. FEET
STEEPEST SLOPE 4:1 H:V
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA 250 FEET
`
EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX B
EROSION CONTROL DETAILS
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
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ROCK SOCK SECTION ROCK SOCK PLAN
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Chapter 7 Construction BMPs
November 2010 Urban Drainage and Flood Control District 7-13
Urban Storm Drainage Criteria Manual Volume 3
Final Stabilization
▪Revegetate Site
▪Activate Post Construction BMPs
(e.g., convert sediment basin to extended detention basin)
▪Remove Temporary BMPs
▪Closeout State and Local Stormwater Permits
Construction Phase
Representative Phases:
▪Clearing and Grubbing
▪Rough Grading
▪Road Construction
▪Utility and Infrastructure Installation
▪Vertical Construction (Buildings)
▪Final Grading
Management Practices:
▪Phase Construction Activities to Minimize
Disturbed Area at a Given Time
▪Sequence Contruction within Phases to Avoid
Idle Disturbed Areas
▪Install, Inspect and Proactively Maintain BMPs
Appropriate for Each Phase of Construction
▪Maintain and Update SWMP as Construction
Progresses
Pre-Construction
▪Develop Site Plan
▪Obtain Site Survey, Hydrology and Soils Information
▪Prepare SWMP
▪Obtain Stormwater Construction Permits
(State and Local)
▪Obtain Other Relevant Permits
(e.g., 404 , Floodplain, Dewatering)
Figure 7-2. Construction Stormwater Management
Construction BMPs Construction BMPs
7-14 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Functions Erosion
Control
Sediment
Control
Site/Material
Management
Surface Roughening Yes No No
Temporary/Permanent Seeding Yes No No
Soil Binders Yes No Moderate
Mulching Yes Moderate No
Compost Blankets and Filter Berms Yes Moderate No
Rolled Erosion Control Products Yes No No
Temporary Slope Drains Yes No No
Temporary Outlet Protection Yes Moderate No
Rough Cut Street Control Yes Moderate No
Earth Dikes / Drainage Swales Yes Moderate No
Terracing Yes Moderate No
Check Dams Yes Moderate No
Streambank Stabilization Yes No No
Wind Erosion / Dust Control Yes No Moderate
Silt Fence No Yes No
Sediment Control Log Moderate Yes No
Straw Bale Barrier No Moderate No
Brush Barrier Moderate Moderate No
Rock Sock (perimeter control)No Yes No
Inlet Protection (various forms)No Yes No
Sediment Basins No Yes No
Sediment Traps No Yes No
Vegetative Buffers Moderate Yes Yes
Chemical Treatment Moderate Yes No
Concrete Washout Area No No Yes
Stockpile Management Yes Yes Yes
Good Houskeeping (multiple practices)No No Yes
Construction Phasing Moderate Moderate Yes
Protection of Existing Vegetation Yes Moderate Yes
Construction Fence No No Yes
Vehicle Tracking Control Moderate Yes Yes
Stabilized Construction Roadway Yes Moderate Yes
Stabilized Staging Area Yes Moderate Yes
Street Sweeping / Vacuuming No Yes Yes
Temporary Diversion Channel Yes No No
Dewatering Operations Moderate Yes Yes
Temporary Stream Crossing Yes Yes No
Temporary Batch Plants No No Yes
Paving and Grinding Operations No No Yes
Site Management and Other Specific Practices
Sediment Control BMPs
Erosion Control BMPs
Materials Management
Table 7-2. Overview of Construction BMPs
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SR-1. Surface roughening via imprinting for temporary stabilization.
Description
Surface roughening is an erosion control
practice that involves tracking, scarifying, imprinting, or tilling a disturbed area to provide temporary
stabilization of disturbed areas. Surface roughening creates variations in the soil
surface that help to minimize wind and
water erosion. Depending on the technique used, surface roughening may
also help establish conditions favorable
to establishment of vegetation.
Appropriate Uses
Surface roughening can be used to provide temporary stabilization of disturbed areas, such as when
revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls.
Surface roughening is often implemented in conjunction with grading and is typically performed using
heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are
better surface roughening techniques in locations where revegetation is planned. Roughening is not
effective in very sandy soils and cannot be effectively performed in rocky soil.
Design and Installation
Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and SR-2, respectively.
Surface roughening should be performed either after final grading or to temporarily stabilize an area
during active construction that may be inactive for a short time period. Surface roughening should create depressions 2 to 6 inches deep and approximately 6 inches apart. The surface of exposed soil can be
roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the
contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or tilling.
Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be
roughened as a subsequent operation. Roughening should follow along the contours of the slope. The tracks left by truck mounted equipment working perpendicular
to the contour can leave acceptable horizontal depressions; however, the equipment will also compact the soil.
Surface Roughening
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-1 Surface Roughening (SR)
SR-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Care should be taken not to drive vehicles or equipment over areas that have been surface roughened.
Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies.
Because surface roughening is only a temporary control, additional treatments may be necessary to maintain the soil surface in a roughened condition.
Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not provide long-term erosion control.
Surface Roughening (SR) EC-1
November 2010 Urban Drainage and Flood Control District SR-3
Urban Storm Drainage Criteria Manual Volume 3
EC-1 Surface Roughening (SR)
SR-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of Douglas County.
Description
Temporary seeding can be used to
stabilize disturbed areas that will be inactive for an extended period. Permanent seeding should be used to
stabilize areas at final grade that will not be otherwise stabilized. Effective seeding
includes preparation of a seedbed,
selection of an appropriate seed mixture, proper planting techniques, and protection
of the seeded area with mulch, geotextiles,
or other appropriate measures.
Appropriate Uses
When the soil surface is disturbed and will remain inactive for an extended
period (typically 30 days or longer),
proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order of two weeks), techniques such as surface roughening may be appropriate. For longer periods of
inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding
should be used on finished areas that have not been otherwise stabilized.
Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional
requirements for seeding and temporary stabilization.
Design and Installation
Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of
appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric until plants are established.
The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding and mulching recommendations that may be referenced to supplement this Fact Sheet.
Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where
steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have soil conditions capable of supporting vegetation. Overlot grading can result in loss of topsoil, resulting in poor quality
subsoils at the ground surface that have low nutrient value,
little organic matter content, few soil microorganisms, rooting restrictions, and conditions less conducive to
infiltration of precipitation. As a result, it is typically necessary to provide stockpiled topsoil, compost, or other
Temporary and Permanent Seeding
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
soil amendments and rototill them into the soil to a depth of 6 inches or more.
Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later.
Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its
water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content. The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across
areas that will be revegetated.
Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth
medium. Organic matter, such as well digested compost, can be added to improve soil characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil testing, which is typically inexpensive, should be completed to determine and optimize the types and
amounts of amendments that are required.
If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement
of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth.
Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth
and conducive to plant growth. Seed-to-soil contact is the key to good germination.
Seed Mix for Temporary Vegetation
To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully
landscaped or worked for an extended period (typically 30 days or more), plant an annual grass appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver metropolitan area are listed in Table TS/PS-1. These are to be considered only as general
recommendations when specific design guidance for a particular site is not available. Local governments typically specify seed mixes appropriate for their jurisdiction.
Seed Mix for Permanent Revegetation
To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should
be established. Permanent seeding should be performed promptly (typically within 14 days) after reaching final grade. Each site will have different characteristics and a landscape professional or the local
jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a
specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended
in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding equipment.
If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus
nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii),
plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen
for perennial grasses.
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-3
Urban Storm Drainage Criteria Manual Volume 3
Seeding dates for the highest success probability of perennial species along the Front Range are generally in the spring from April through early May and in the fall after the first of September until the ground
freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Speciesa (Common name)
Growth
Seasonb
Pounds of Pure Live Seed
(PLS)/acrec
Planting Depth (inches)
1. Oats Cool 35 - 50 1 - 2
2. Spring wheat Cool 25 - 35 1 - 2
3. Spring barley Cool 25 - 35 1 - 2
4. Annual ryegrass Cool 10 - 15 ½
5. Millet Warm 3 - 15 ½ - ¾
6. Sudangrass Warm 5–10 ½ - ¾
7. Sorghum Warm 5–10 ½ - ¾
8. Winter wheat Cool 20–35 1 - 2
9. Winter barley Cool 20–35 1 - 2
10. Winter rye Cool 20–35 1 - 2
11. Triticale Cool 25–40 1 - 2
a Successful seeding of annual grass resulting in adequate plant growth will usually produce enough dead-plant residue to provide protection from
wind and water erosion for an additional year. This assumes that the cover is not disturbed or mowed closer than 8 inches.
Hydraulic seeding may be substituted for drilling only where slopes are
steeper than 3:1 or where access limitations exist. When hydraulic seeding is used, hydraulic mulching should be applied as a separate operation, when practical, to prevent the seeds from being encapsulated in
the mulch.
b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied, may extend the use of cool season species during the summer months.
c Seeding rates should be doubled if seed is broadcast, or increased by 50 percent if done using a Brillion Drill or by hydraulic seeding.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Commona
Name
Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum 'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum 'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum 'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
November 2010 Urban Drainage and Flood Control District TS/PS-5
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.)
Common Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre
Sandy Soil Seed Mix
Blue grama Bouteloua gracilis Warm Sod-forming bunchgrass 825,000 0.5
Camper little bluestem Schizachyrium scoparium 'Camper' Warm Bunch 240,000 1.0
Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0
Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25
Vaughn sideoats grama Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 10.25
Heavy Clay, Rocky Foothill Seed Mix
Ephriam crested wheatgrassd Agropyron cristatum 'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium 'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats gramae Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped hay or straw mulch. These rates should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1.
If hydraulic seeding is used, hydraulic mulching should be done as a separate operation.
b See Table TS/PS-3 for seeding dates.
c If site is to be irrigated, the transition turf seed rates should be doubled.
d Crested wheatgrass should not be used on slopes steeper than 6H to 1V.
e Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama.
EC-2 Temporary and Permanent Seeding (TS/PS)
TS/PS-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses
(Numbers in table reference species in Table TS/PS-1)
Perennial Grasses
Seeding Dates Warm Cool Warm Cool
January 1–March 15
March 16–April 30 4 1,2,3
May 1–May 15 4
May 16–June 30 4,5,6,7
July 1–July 15 5,6,7
July 16–August 31
September 1–September 30 8,9,10,11
October 1–December 31
Mulch
Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment
of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP Fact Sheet for additional guidance.
Maintenance and Removal
Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed
and mulch these areas, as needed.
An area that has been permanently seeded should have a good stand of vegetation within one growing season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of
the site that fail to germinate or remain bare after the first growing season.
Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may also be necessary.
Protect seeded areas from construction equipment and vehicle access.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-1
Urban Storm Drainage Criteria Manual Volume 3
Description
Soil binders include a broad range of
treatments that can be applied to exposed soils for temporary stabilization to reduce wind and water erosion. Soil binders may
be applied alone or as tackifiers in conjunction with mulching and seeding
applications.
Acknowledgement: This BMP Fact Sheet has been adapted from the 2003
California Stormwater Quality Association (CASQA) Stormwater BMP Handbook: Construction
(www.cabmphandbooks.com).
Appropriate Uses
Soil binders can be used for short-term, temporary stabilization of soils on both mild and steep slopes.
Soil binders are often used in areas where work has temporarily stopped, but is expected to resume before revegetation can become established. Binders are also useful on stockpiled soils or where temporary or
permanent seeding has occurred.
Prior to selecting a soil binder, check with the state and local jurisdiction to ensure that the chemicals used in the soil binders are allowed. The water quality impacts of some types of soil binders are relatively
unknown and may not be allowed due to concerns about potential environmental impacts. Soil binders
must be environmentally benign (non-toxic to plant and animal life), easy to apply, easy to maintain, economical, and should not stain paved or painted surfaces.
Soil binders should not be used in vehicle or pedestrian high traffic areas, due to loss in effectiveness under these conditions.
Site soil type will dictate appropriate soil binders to be used. Be aware that soil binders may not function
effectively on silt or clay soils or highly compacted areas. Check manufacturer's recommendations for appropriateness with regard to soil conditions. Some binders may not be suitable for areas with existing vegetation.
Design and Installation
Properties of common soil binders used for erosion control
are provided in Table SB-1. Design and installation guidance below are provided for general reference. Follow
the manufacturer's instructions for application rates and
procedures.
Soil Binders
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management Moderate
Photograph SB-1. Tackifier being applied to provide temporary soil stabilization. Photo courtesy of Douglas County.
EC-3 Soil Binders (SB)
SB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table SB-1. Properties of Soil Binders for Erosion Control (Source: CASQA 2003)
Evaluation Criteria
Binder Type
Plant Material
Based (short lived)
Plant Material
Based (long lived)
Polymeric Emulsion Blends Cementitious-Based Binders
Resistance to Leaching High High Low to Moderate Moderate
Resistance to Abrasion Moderate Low Moderate to High Moderate to High
Longevity Short to Medium Medium Medium to Long Medium
Minimum Curing Time before Rain 9 to 18 hours 19 to 24 hours 0 to 24 hours 4 to 8 hours
Compatibility with Existing Vegetation Good Poor Poor Poor
Mode of Degradation Biodegradable Biodegradable Photodegradable/ Chemically
Degradable
Photodegradable/ Chemically
Degradable
Specialized Application
Equipment
Water Truck or
Hydraulic Mulcher
Water Truck or
Hydraulic Mulcher
Water Truck or
Hydraulic Mulcher
Water Truck or
Hydraulic Mulcher
Liquid/Powder Powder Liquid Liquid/Powder Powder
Surface Crusting Yes, but dissolves on
rewetting
Yes Yes, but dissolves on rewetting Yes
Clean Up Water Water Water Water
Erosion Control
Application Rate Varies Varies Varies 4,000 to 12,000
lbs/acre Typ.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-3
Urban Storm Drainage Criteria Manual Volume 3
Factors to consider when selecting a soil binder generally include:
Suitability to situation: Consider where the soil binder will be applied, if it needs a high resistance
to leaching or abrasion, and whether it needs to be compatible with existing vegetation. Determine
the length of time soil stabilization will be needed, and if the soil binder will be placed in an area where it will degrade rapidly. In general, slope steepness is not a discriminating factor.
Soil types and surface materials: Fines and moisture content are key properties of surface
materials. Consider a soil binder's ability to penetrate, likelihood of leaching, and ability to form a surface crust on the surface materials.
Frequency of application: The frequency of application can be affected by subgrade conditions,
surface type, climate, and maintenance schedule. Frequent applications could lead to high costs. Application frequency may be minimized if the soil binder has good penetration, low evaporation,
and good longevity. Consider also that frequent application will require frequent equipment clean up.
An overview of major categories of soil binders, corresponding to the types included in Table SB-1 follows.
Plant-Material Based (Short Lived) Binders
Guar: A non-toxic, biodegradable, natural galactomannan-based hydrocolloid treated with dispersant agents for easy field mixing. It should be mixed with water at the rate of 11 to 15 lbs per 1,000
gallons. Recommended minimum application rates are provided in Table SB-2.
Table SB-2. Application Rates for Guar Soil Stabilizer
Slope (H:V)
Flat 4:1 3:1 2:1 1:1
Application Rate (lb/acre) 40 45 50 60 70
Psyllium: Composed of the finely ground muciloid coating of plantago seeds that is applied as a wet
slurry to the surface of the soil. It dries to form a firm but rewettable membrane that binds soil particles together but permits germination and growth of seed. Psyllium requires 12 to 18 hours drying time. Application rates should be from 80 to 200 lbs/acre, with enough water in solution to
allow for a uniform slurry flow.
Starch: Non-ionic, cold-water soluble (pre-gelatinized) granular cornstarch. The material is mixed
with water and applied at the rate of 150 lb/acre. Approximate drying time is 9 to 12 hours.
Plant-Material Based (Long Lived) Binders
Pitch and Rosin Emulsion: Generally, a non-ionic pitch and rosin emulsion has a minimum solids content of 48 percent. The rosin should be a minimum of 26 percent of the total solids content. The
soil stabilizer should be a non-corrosive, water dilutable emulsion that upon application cures to a water insoluble binding and cementing agent. For soil erosion control applications, the emulsion is
diluted and should be applied as follows:
o For clayey soil: 5 parts water to 1 part emulsion
EC-3 Soil Binders (SB)
SB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o For sandy soil: 10 parts water to 1 part emulsion
Application can be by water truck or hydraulic seeder with the emulsion and product mixture applied
at the rate specified by the manufacturer.
Polymeric Emulsion Blend Binders
Acrylic Copolymers and Polymers: Polymeric soil stabilizers should consist of a liquid or solid polymer or copolymer with an acrylic base that contains a minimum of 55 percent solids. The
polymeric compound should be handled and mixed in a manner that will not cause foaming or should contain an anti-foaming agent. The polymeric emulsion should not exceed its shelf life or expiration
date; manufacturers should provide the expiration date. Polymeric soil stabilizer should be readily
miscible in water, non-injurious to seed or animal life, non-flammable, should provide surface soil stabilization for various soil types without inhibiting water infiltration, and should not re-emulsify when cured. The applied compound should air cure within a maximum of 36 to 48 hours. Liquid
copolymer should be diluted at a rate of 10 parts water to 1 part polymer and the mixture applied to soil at a rate of 1,175 gallons/acre.
Liquid Polymers of Methacrylates and Acrylates: This material consists of a tackifier/sealer that is
a liquid polymer of methacrylates and acrylates. It is an aqueous 100 percent acrylic emulsion blend of 40 percent solids by volume that is free from styrene, acetate, vinyl, ethoxylated surfactants or
silicates. For soil stabilization applications, it is diluted with water in accordance with manufacturer's
recommendations, and applied with a hydraulic seeder at the rate of 20 gallons/acre. Drying time is 12 to 18 hours after application.
Copolymers of Sodium Acrylates and Acrylamides: These materials are non-toxic, dry powders that are copolymers of sodium acrylate and acrylamide. They are mixed with water and applied to the soil surface for erosion control at rates that are determined by slope gradient, as summarized in Table
SB-3.
Table SB-3. Application Rates for Copolymers of Sodium Acrylates and Acrylamides
Slope (H:V)
Flat to 5:1 5:1 to 3:1 2:2 to 1:1
Application Rate (lb/acre) 3.0-5.0 5.0-10.0 10.0-20.0
Polyacrylamide and Copolymer of Acrylamide: Linear copolymer polyacrylamide is packaged as a dry flowable solid. When used as a stand-alone stabilizer, it is diluted at a rate of 11 lb/1,000 gal. of
water and applied at the rate of 5.0 lb/acre.
Hydrocolloid Polymers: Hydrocolloid Polymers are various combinations of dry flowable polyacrylamides, copolymers, and hydrocolloid polymers that are mixed with water and applied to the
soil surface at rates of 55 to 60 lb/acre. Drying times are 0 to 4 hours.
Cementitious-Based Binders
Gypsum: This formulated gypsum based product readily mixes with water and mulch to form a thin
protective crust on the soil surface. It is composed of high purity gypsum that is ground, calcined and processed into calcium sulfate hemihydrate with a minimum purity of 86 percent. It is mixed in a
hydraulic seeder and applied at rates 4,000 to 12,000 lb/acre. Drying time is 4 to 8 hours.
Soil Binders (SB) EC-3
November 2010 Urban Drainage and Flood Control District SB-5
Urban Storm Drainage Criteria Manual Volume 3
Installation
After selecting an appropriate soil binder, the untreated soil surface must be prepared before applying the soil binder. The untreated soil surface must contain sufficient moisture to assist the agent in achieving
uniform distribution. In general, the following steps should be followed:
Follow manufacturer's written recommendations for application rates, pre-wetting of application area, and cleaning of equipment after use.
Prior to application, roughen embankment and fill areas.
Consider the drying time for the selected soil binder and apply with sufficient time before anticipated rainfall. Soil binders should not be applied during or immediately before rainfall.
Avoid over spray onto roads, sidewalks, drainage channels, sound walls, existing vegetation, etc.
Soil binders should not be applied to frozen soil, areas with standing water, under freezing or rainy conditions, or when the temperature is below 40°F during the curing period.
More than one treatment is often necessary, although the second treatment may be diluted or have a lower application rate.
Generally, soil binders require a minimum curing time of 24 hours before they are fully effective.
Refer to manufacturer's instructions for specific cure time.
For liquid agents:
o Crown or slope ground to avoid ponding.
o Uniformly pre-wet ground at 0.03 to 0.3 gal/yd2 or according to manufacturer's recommendations.
o Apply solution under pressure. Overlap solution 6 to 12 in.
o Allow treated area to cure for the time recommended by the manufacturer, typically at least 24
hours.
o Apply second treatment before first treatment becomes ineffective, using 50 percent application
rate.
o In low humidity, reactivate chemicals by re-wetting with water at 0.1 to 0.2 gal/yd2.
Maintenance and Removal
Soil binders tend to break down due to natural weathering. Weathering rates depend on a variety of site-specific and product characteristics. Consult the manufacturer for recommended reapplication rates and
reapply the selected soil binder as needed to maintain effectiveness.
Soil binders can fail after heavy rainfall events and may require reapplication. In particular, soil binders will generally experience spot failures during heavy rainfall events. If runoff penetrates the soil at the top
of a slope treated with a soil binder, it is likely that the runoff will undercut the stabilized soil layer and discharge at a point further down slope.
EC-3 Soil Binders (SB)
SB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Areas where erosion is evident should be repaired and soil binder or other stabilization reapplied, as needed. Care should be exercised to minimize the damage to protected areas while making repairs.
Most binders biodegrade after exposure to sun, oxidation, heat and biological organisms; therefore,
removal of the soil binder is not typically required.
Mulching (MU) EC-4
November 2010 Urban Drainage and Flood Control District MU-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph MU-1. An area that was recently seeded, mulched, and crimped.
Description
Mulching consists of evenly applying
straw, hay, shredded wood mulch, bark or compost to disturbed soils and securing the mulch by crimping, tackifiers, netting
or other measures. Mulching helps reduce erosion by protecting bare soil from
rainfall impact, increasing infiltration, and
reducing runoff. Although often applied in conjunction with temporary or
permanent seeding, it can also be used for
temporary stabilization of areas that cannot be reseeded due to seasonal
constraints.
Mulch can be applied either using standard mechanical dry application
methods or using hydromulching equipment
that hydraulically applies a slurry of water, wood fiber mulch, and often a tackifier.
Appropriate Uses
Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also
be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer
than 14 days) on portions of the site not otherwise permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed in certain jurisdictions or may not be allowed near waterways.
Do not apply mulch during windy conditions.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track walking. Track walking should only be used where other methods are impractical because track walking with heavy equipment typically compacts the soil.
A variety of mulches can be used effectively at construction sites, including the following types:
Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-4 Mulching (MU)
MU-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Clean, weed- and seed-free, long-stemmed grass hay (preferred) or cereal grain straw. Hay is preferred because it is less susceptible to removal by wind. Mulch should be applied evenly at a rate of 2 tons per
acre and must be tacked or fastened by an approved method suitable for the type of mulch used. At least
50 percent of the grass hay mulch, by weight, should be 10 inches or more in length.
Grass hay mulch must be anchored and not merely placed on the surface. This can be accomplished
mechanically by crimping or with the aid of tackifiers or nets. Anchoring with a crimping implement is
preferred, and is the recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long mulch fibers into the soil to a depth of 3 inches without cutting them. An
agricultural disk, while not an ideal substitute, may work if the disk blades are dull or blunted and set
vertically; however, the frame may have to be weighted to afford proper soil penetration.
On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory
for holding it in place. For steep slopes and special situations where greater control is needed, erosion control blankets anchored with stakes should be used instead of mulch.
Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should
be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be
applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation should be avoided.
Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and
steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass or straw mulch. Normally, use of these products will be restricted to relatively small areas.
Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead
of mulch. (See the ECM/TRM BMP for more information.)
Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed
tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP
for more information on general types of tackifiers.)
Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and
allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full coverage of exposed soil on the area it is applied.
Maintenance and Removal
After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as
needed, to cover bare areas.
Compost Blanket and Filter Berm (CB) EC-5
November 2010 Urban Drainage and Flood Control District CB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CB-1. Application of a compost blanket to a disturbed area. Photo courtesy of Caltrans.
Description
A compost blanket is a layer of compost uniformly applied
to the soil in disturbed areas to control erosion, facilitate revegetation, and retain sediment resulting from sheet-flow runoff.
A compost filter berm is a dike of compost or a compost product that is placed perpendicular to runoff to control
erosion in disturbed areas and retain sediment. Compost
berms can be placed at regular intervals to help reduce the formation of rill and gully erosion when a compost blanket
is stabilizing a slope.
Appropriate Uses
Compost blankets can be used as an alternative to erosion
control blankets and mulching to help stabilize disturbed areas where sheet flow conditions are present. Compost
blankets should not be used in areas of concentrated flows.
Compost provides an excellent source of nutrients for plant growth, and should be considered for use in areas that will be
permanently vegetated.
Design and Installation
See Detail CB-1 for design details and notes.
Do not place compost in areas where it can easily be transported into drainage pathways or waterways. When using a compost blanket on a slope, berms should be installed periodically to reduce the potential
for concentrated flow and rilling. Seeding should be completed before an area is composted or
incorporated into the compost.
Compost quality is an important consideration when selecting compost blankets or berms. Representative
compost quality factors include pH, salinity, moisture content, organic matter content, stability (maturity), and physical contaminants. The compost should meet all local, state, and federal quality requirements. Biosolids compost must meet the Standards for Class A biosolids outlined in 40 CFR Part 503. The U.S.
Composting Council (USCC) certifies compost products under its Seal of Testing Assurance (STA) Program. Compost producers whose products have been certified through the STA Program provide customers with a standard product label that allows comparison between compost products. Only STA
certified, Class I compost should be used.
Compost Blankets and Berms
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-5 Compost Blanket and Filter Berm (CB)
CB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
When rills or gullies develop in an area that has been composted, fill and cover the area with additional
compost and install berms as necessary to help reduce erosion.
Weed control can be a maintenance challenge in areas using compost blankets. A weed control strategy may be necessary, including measures such as mechanical removal and spot application of targeted
herbicides by licensed applicators.
For compost berms, accumulated sediments should be removed from behind the berm when the sediments reach approximately one third the height of the berm. Areas that have been washed away should be
replaced. If the berm has experienced significant or repeated washouts, a compost berm may not be the appropriate BMP for this area.
Compost blankets and berms biodegrade and do not typically require removal following site stabilization.
Compost Blanket and Filter Berm (CB) EC-5
November 2010 Urban Drainage and Flood Control District CB-3
Urban Storm Drainage Criteria Manual Volume 3
EC-5 Compost Blanket and Filter Berm (CB)
CB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RECP-1. Erosion control blanket protecting the slope from erosion and providing favorable conditions for revegetation.
Description
Rolled Erosion Control Products
(RECPs) include a variety of temporary or permanently installed manufactured products designed to
control erosion and enhance vegetation establishment and survivability,
particularly on slopes and in channels.
For applications where natural vegetation alone will provide sufficient
permanent erosion protection,
temporary products such as netting, open weave textiles and a variety of
erosion control blankets (ECBs) made
of biodegradable natural materials (e.g., straw, coconut fiber) can be used.
For applications where natural
vegetation alone will not be sustainable under expected flow conditions, permanent rolled erosion control products such as turf reinforcement mats (TRMs) can be used. In particular, turf reinforcement mats are
designed for discharges that exert velocities and sheer stresses that exceed the typical limits of mature natural vegetation.
Appropriate Uses
RECPs can be used to control erosion in conjunction with revegetation efforts, providing seedbed protection from wind and water erosion. These products are often used on disturbed areas on steep
slopes, in areas with highly erosive soils, or as part of drainageway stabilization. In order to select the appropriate RECP for site conditions, it is important to have a general understanding of the general types of these products, their expected longevity, and general characteristics.
The Erosion Control Technology Council (ECTC 2005) characterizes rolled erosion control products according to these categories:
Mulch control netting: A planar woven natural fiber or extruded geosynthetic mesh used as a
temporary degradable rolled erosion control product to anchor loose fiber mulches.
Open weave textile: A temporary degradable rolled erosion control product composed of processed
natural or polymer yarns woven into a matrix, used to provide erosion control and facilitate
vegetation establishment.
Erosion control blanket (ECB): A temporary
degradable rolled erosion control product composed of
processed natural or polymer fibers which are mechanically, structurally or chemically bound together
to form a continuous matrix to provide erosion control and facilitate vegetation establishment. ECBs can be further differentiated into rapidly degrading single-net
and double-net types or slowly degrading types.
Rolled Erosion Control Products
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-6 Rolled Erosion Control Products (RECP)
RECP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Turf Reinforcement Mat (TRM): A rolled erosion control product composed of non-degradable synthetic fibers, filaments, nets, wire mesh, and/or other elements, processed into a permanent, three-
dimensional matrix of sufficient thickness. TRMs, which may be supplemented with degradable
components, are designed to impart immediate erosion protection, enhance vegetation establishment and provide long-term functionality by permanently reinforcing vegetation during and after
maturation. Note: TRMs are typically used in hydraulic applications, such as high flow ditches and
channels, steep slopes, stream banks, and shorelines, where erosive forces may exceed the limits of natural, unreinforced vegetation or in areas where limited vegetation establishment is anticipated.
Tables RECP-1 and RECP-2 provide guidelines for selecting rolled erosion control products appropriate
to site conditions and desired longevity. Table RECP-1 is for conditions where natural vegetation alone will provide permanent erosion control, whereas Table RECP-2 is for conditions where vegetation alone
will not be adequately stable to provide long-term erosion protection due to flow or other conditions.
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-3
Urban Storm Drainage Criteria Manual Volume 3
Table RECP-1. ECTC Standard Specification for Temporary Rolled Erosion Control Products (Adapted from Erosion Control Technology Council 2005)
Product Description Slope Applications* Channel Applications*
Minimum
Tensile Strength1
Expected
Longevity
Maximum Gradient C Factor2,5 Max. Shear Stress3,4,6
Mulch Control Nets 5:1 (H:V) ≤0.10 @ 5:1 0.25 lbs/ft2 (12 Pa) 5 lbs/ft (0.073 kN/m)
Up to 12
months
Netless Rolled Erosion Control Blankets 4:1 (H:V) ≤0.10 @
4:1
0.5 lbs/ft2
(24 Pa)
5 lbs/ft
(0.073 kN/m)
Single-net Erosion Control Blankets &
Open Weave Textiles
3:1 (H:V) ≤0.15 @ 3:1 1.5 lbs/ft2 (72 Pa) 50 lbs/ft (0.73 kN/m)
Double-net Erosion
Control Blankets 2:1 (H:V) ≤0.20 @
2:1
1.75 lbs/ft2
(84 Pa)
75 lbs/ft
(1.09 kN/m)
Mulch Control Nets 5:1 (H:V) ≤0.10 @
5:1
0.25 lbs/ft2
(12 Pa)
25 lbs/ft
(0.36 kN/m) 24 months
Erosion Control
Blankets & Open Weave Textiles
(slowly degrading)
1.5:1 (H:V) ≤0.25 @ 1.5:1 2.00 lbs/ft2 (96 Pa) 100 lbs/ft (1.45 kN/m) 24 months
Erosion Control Blankets & Open
Weave Textiles
1:1 (H:V) ≤0.25 @ 1:1 2.25 lbs/ft2 (108 Pa) 125 lbs/ft (1.82 kN/m) 36 months
* C Factor and shear stress for mulch control nettings must be obtained with netting used in conjunction
with pre-applied mulch material. (See Section 5.3 of Chapter 7 Construction BMPs for more information on the C Factor.)
1 Minimum Average Roll Values, Machine direction using ECTC Mod. ASTM D 5035.
2 C Factor calculated as ratio of soil loss from RECP protected slope (tested at specified or greater
gradient, H:V) to ratio of soil loss from unprotected (control) plot in large-scale testing.
3 Required minimum shear stress RECP (unvegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in) soil loss) during a 30-minute flow event in large-scale testing.
4 The permissible shear stress levels established for each performance category are based on historical experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05.
5 Acceptable large-scale test methods may include ASTM D 6459, or other independent testing deemed
acceptable by the engineer.
6 Per the engineer’s discretion. Recommended acceptable large-scale testing protocol may include ASTM
D 6460, or other independent testing deemed acceptable by the engineer.
EC-6 Rolled Erosion Control Products (RECP)
RECP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Table RECP-2. ECTC Standard Specification for Permanent1 Rolled Erosion Control Products (Adapted from: Erosion Control Technology Council 2005)
Product Type Slope Applications Channel Applications
TRMs with a minimum thickness of
0.25 inches (6.35 mm) per ASTM D 6525 and UV stability of 80% per
ASTM D 4355 (500 hours exposure).
Maximum
Gradient
Maximum
Shear Stress4,5
Minimum
Tensile Strength2,3
0.5:1 (H:V) 6.0 lbs/ft2 (288 Pa) 125 lbs/ft (1.82 kN/m)
0.5:1 (H:V) 8.0 lbs/ft2 (384 Pa) 150 lbs/ft (2.19 kN/m)
0.5:1 (H:V) 10.0 lbs/ft2 (480 Pa) 175 lbs/ft (2.55 kN/m)
1 For TRMs containing degradable components, all property values must be obtained on the non-
degradable portion of the matting alone.
2 Minimum Average Roll Values, machine direction only for tensile strength determination using ASTM D 6818 (Supersedes Mod. ASTM D 5035 for RECPs)
3 Field conditions with high loading and/or high survivability requirements may warrant the use of a TRM
with a tensile strength of 44 kN/m (3,000 lb/ft) or greater.
4 Required minimum shear stress TRM (fully vegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in.) soil loss) during a 30-minute flow event in large scale testing.
5 Acceptable large-scale testing protocols may include ASTM D 6460, or other independent testing deemed acceptable by the engineer.
Design and Installation
RECPs should be installed according to manufacturer’s specifications and guidelines. Regardless of the
type of product used, it is important to ensure no gaps or voids exist under the material and that all
corners of the material are secured using stakes and trenching. Continuous contact between the product and the soil is necessary to avoid failure. Never use metal stakes to secure temporary erosion control
products. Often wooden stakes are used to anchor RECPs; however, wood stakes may present installation
and maintenance challenges and generally take a long time to biodegrade. Some local jurisdictions have had favorable experiences using biodegradable stakes.
This BMP Fact Sheet provides design details for several commonly used ECB applications, including:
ECB-1 Pipe Outlet to Drainageway
ECB-2 Small Ditch or Drainageway
ECB-3 Outside of Drainageway
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-5
Urban Storm Drainage Criteria Manual Volume 3
Staking patterns are also provided in the design details according to these factors:
ECB type
Slope or channel type
For other types of RECPs including TRMs, these design details are intended to serve as general guidelines for design and installation; however, engineers should adhere to manufacturer’s installation
recommendations.
Maintenance and Removal
Inspection of erosion control blankets and other RECPs includes:
Check for general signs of erosion, including voids beneath the mat. If voids are apparent, fill the void with suitable soil and replace the erosion control blanket, following the appropriate staking
pattern.
Check for damaged or loose stakes and secure loose portions of the blanket.
Erosion control blankets and other RECPs that are biodegradable typically do not need to be removed
after construction. If they must be removed, then an alternate soil stabilization method should be installed
promptly following removal.
Turf reinforcement mats, although generally resistant to biodegradation, are typically left in place as a
dense vegetated cover grows in through the mat matrix. The turf reinforcement mat provides long-term stability and helps the established vegetation resist erosive forces.
EC-6 Rolled Erosion Control Products (RECP)
RECP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-7
Urban Storm Drainage Criteria Manual Volume 3
EC-6 Rolled Erosion Control Products (RECP)
RECP-8 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC-6
November 2010 Urban Drainage and Flood Control District RECP-9
Urban Storm Drainage Criteria Manual Volume 3
Temporary Slope Drains (TSD) EC-7
November 2010 Urban Drainage and Flood Control District SD-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TSD-1. A temporary slope drain installed to convey runoff down a slope during construction. Photo courtesy of the City of Aurora.
Description
A temporary slope drain is a pipe or culvert used to convey water down a slope where there is a high
potential for erosion. A drainage channel or swale at the top of the slope typically directs upgradient runoff to the pipe entrance for conveyance down the slope. The pipe outlet must be equipped with outlet protection.
Appropriate Uses
Use on long, steep slopes when there is a high potential of flow concentration or rill development.
Design and Installation
Effective use of temporary slope drains involves design of an effective collection system to direct flows to
the pipe, proper sizing and anchoring of the pipe, and outlet protection. Upgradient of the temporary slope drain, a temporary drainage ditch or swale should be constructed to collect surface runoff from the drainage area and convey it to the drain entrance. The temporary slope drain must be sized to safely
convey the desired flow volume. At a minimum, it should be sized to convey the 2-year, 24-hour storm.
Temporary slope drains may be constructed of flexible or rigid pipe, riprap, or heavy (30 mil) plastic
lining. When piping is used, it must be properly anchored by burying it with adequate cover or by using
an anchor system to secure it to the ground.
The discharge from the slope drain must be directed to a stabilized outlet, temporary or permanent
channel, and/or sedimentation basin.
See Detail TSD-1 for additional sizing and design information.
Temporary Slope Drains
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-7 Temporary Slope Drains (TSD)
SD-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Inspect the entrance for sediment accumulation and remove, as needed. Clogging as a result of sediment
deposition at the entrance can lead to ponding upstream causing flooding or overtopping of the slope drain. Inspect the downstream outlet for signs of erosion and stabilize, as needed. It may also be necessary to remove accumulated sediment at the outfall. Inspect pipe anchors to ensure that they are
secure. If the pipe is secured by ground cover, ensure erosion has not compromised the depth of cover.
Slope drains should be removed when no longer needed or just prior to installation of permanent slope
stabilization measures that cannot be installed with the slope drain in place. When slope drains are
removed, the disturbed areas should be covered with topsoil, seeded, mulched or otherwise stabilized as required by the local jurisdiction.
Temporary Slope Drains (TSD) EC-7
November 2010 Urban Drainage and Flood Control District SD-3
Urban Storm Drainage Criteria Manual Volume 3
EC-7 Temporary Slope Drains (TSD)
SD-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP) EC-8
November 2010 Urban Drainage and Flood Control District TOP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TOP-1. Riprap outlet protection.
Description
Outlet protection helps to reduce erosion
immediately downstream of a pipe, culvert, slope drain, rundown or other conveyance with concentrated, high-
velocity flows. Typical outlet protection consists of riprap or rock aprons at the
conveyance outlet.
Appropriate Uses
Outlet protection should be used when a
conveyance discharges onto a disturbed area where there is potential for accelerated
erosion due to concentrated flow. Outlet
protection should be provided where the velocity at the culvert outlet exceeds the maximum permissible velocity of the material in the receiving channel.
Note: This Fact Sheet and detail are for temporary outlet protection, outlets that are intended to be used
for less than 2 years. For permanent, long-term outlet protection, see the Major Drainage chapter of Volume 1.
Design and Installation
Design outlet protection to handle runoff from the largest drainage area that may be contributing runoff
during construction (the drainage area may change as a result of grading). Key in rock, around the entire
perimeter of the apron, to a minimum depth of 6 inches for stability. Extend riprap to the height of the culvert or the normal flow depth of the downstream channel, whichever is less. Additional erosion
control measures such as vegetative lining, turf reinforcement mat and/or other channel lining methods
may be required downstream of the outlet protection if the channel is susceptible to erosion. See Design Detail OP-1 for additional information.
Maintenance and Removal
Inspect apron for damage and displaced rocks. If rocks are missing or significantly displaced, repair or
replace as necessary. If rocks are continuously missing or displaced, consider increasing the size of the
riprap or deeper keying of the perimeter.
Remove sediment accumulated at the outlet before the outlet protection becomes buried and ineffective.
When sediment accumulation is noted, check that upgradient BMPs, including inlet protection, are in effective operating condition.
Outlet protection may be removed once the pipe is no longer
draining an upstream area, or once the downstream area has been sufficiently stabilized. If the drainage pipe is permanent, outlet protection can be left in place; however,
permanent outlet protection should be designed and constructed in accordance with the requirements of the
Major Drainage chapter of Volume 2.
Outlet Protection
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-8 Temporary Outlet Protection (TOP)
TOP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP) EC-8
November 2010 Urban Drainage and Flood Control District TOP-3
Urban Storm Drainage Criteria Manual Volume 3
Rough Cut Street Control (RCS) EC-9
November 2010 Urban Drainage and Flood Control District RCS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RCS-1. Rough cut street controls.
Description
Rough cut street controls are rock or
earthen berms placed along dirt roadways that are under construction or used for construction access. These temporary
berms intercept sheet flow and divert runoff from the roadway, and control
erosion by minimizing concentration of
flow and reducing runoff velocity.
Appropriate Uses
Appropriate uses include:
Temporary dirt construction roadways that have not received roadbase.
Roadways under construction that will not be paved within 14 days of final grading, and that have not yet received roadbase.
Design and Installation
Rough cut street controls are designed to redirect sheet flow off the dirt roadway to prevent water from
concentrating and eroding the soil. These controls consist of runoff barriers that are constructed at
intervals along the road. These barriers are installed perpendicular to the longitudinal slope from the outer edge of the roadside swale to the crown of the road. The barriers are positioned alternately from the
right and left side of the road to allow construction traffic to pass in the lane not barred. If construction
traffic is expected to be congested and a vehicle tracking control has been constructed, rough-cut street controls may be omitted for 400 feet from the entrance. Runoff from the controls should be directed to
another stormwater BMP such as a roadside swale with check dams once removed from the roadway. See
Detail RCS-1 for additional information.
Maintenance and Removal
Inspect street controls for erosion and stability. If rills are forming in the roadway or cutting through the control berms, place the street controls at shorter intervals. If earthen berms are used, periodic
recompaction may be necessary. When rock berms are used,
repair and/or replace as necessary when damaged. Street controls may be removed 14 days prior to road surfacing and
paving.
Rough Cut Street Control
Functions Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-9 Rough Cut Street Control (RCS)
RCS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rough Cut Street Control (RCS) EC-9
November 2010 Urban Drainage and Flood Control District RCS-3
Urban Storm Drainage Criteria Manual Volume 3
Earth Dikes and Drainage Swales (ED/DS) EC-10
November 2010 Urban Drainage and Flood Control District ED/DS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph ED/DS-1. Example of an earth dike used to divert flows at a construction site. Photo courtesy of CDOT.
Description
Earth dikes and drainage swales are
temporary storm conveyance channels constructed either to divert runoff around slopes or to convey runoff to additional
sediment control BMPs prior to discharge of runoff from a site. Drainage swales
may be lined or unlined, but if an unlined
swale is used, it must be well compacted and capable of resisting erosive velocities.
Appropriate Uses
Earth dikes and drainage swales are
typically used to control the flow path of
runoff at a construction site by diverting runoff around areas prone to erosion, such
as steep slopes. Earth dikes and drainage
swales may also be constructed as temporary conveyance features. This will
direct runoff to additional sediment control
treatment BMPs, such as sediment traps or basins.
Design and Installation
When earth dikes are used to divert water for slope protection, the earth dike typically consists of a
horizontal ridge of soil placed perpendicular to the slope and angled slightly to provide drainage along the
contour. The dike is used in conjunction with a swale or a small channel upslope of the berm to convey the diverted water. Temporary diversion dikes can be constructed by excavation of a V-shaped trench or
ditch and placement of the fill on the downslope side of the cut. There are two types of placement for temporary slope diversion dikes:
A dike located at the top of a slope to divert upland runoff away from the disturbed area and convey it
in a temporary or permanent channel.
A diversion dike located at the base or mid-slope of a disturbed area to intercept runoff and reduce the effective slope length.
Depending on the project, either an earth dike or drainage swale may be more appropriate. If there is a need for cut on the project, then an excavated drainage swale may be better suited. When the project is primarily
fill, then a conveyance constructed using a berm may be the better option.
All dikes or swales receiving runoff from a disturbed
area should direct stormwater to a sediment control BMP such as a sediment trap or basin.
Earth Dikes and Drainage Swales
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-10 Earth Dikes and Drainage Swales (ED/DS)
ED/DS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Unlined dikes or swales should only be used for intercepting sheet flow runoff and are not intended for diversion of concentrated flows.
Details with notes are provided for several design variations, including:
ED-1. Unlined Earth Dike formed by Berm
DS-1. Unlined Excavated Swale
DS-2. Unlined Swale Formed by Cut and Fill
DS-3. ECB-lined Swale
DS-4. Synthetic-lined Swale
DS-5. Riprap-lined Swale
The details also include guidance on permissible velocities for cohesive channels if unlined approaches will be used.
Maintenance and Removal
Inspect earth dikes for stability, compaction, and signs of erosion and repair. Inspect side slopes for
erosion and damage to erosion control fabric. Stabilize slopes and repair fabric as necessary. If there is
reoccurring extensive damage, consider installing rock check dams or lining the channel with riprap.
If drainage swales are not permanent, remove dikes and fill channels when the upstream area is stabilized.
Stabilize the fill or disturbed area immediately following removal by revegetation or other permanent
stabilization method approved by the local jurisdiction.
Earth Dikes and Drainage Swales (ED/DS) EC-10
November 2010 Urban Drainage and Flood Control District ED/DS-3
Urban Storm Drainage Criteria Manual Volume 3
EC-10 Earth Dikes and Drainage Swales (ED/DS)
ED/DS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Earth Dikes and Drainage Swales (ED/DS) EC-10
November 2010 Urban Drainage and Flood Control District ED/DS-5
Urban Storm Drainage Criteria Manual Volume 3
Terracing (TER) EC-11
November 2010 Urban Drainage and Flood Control District TER-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TER-1. Use of a terrace to reduce erosion by controlling slope length on a long, steep slope. Photo courtesy of Douglas County.
Description
Terracing involves grading steep slopes
into a series of relatively flat sections, or terraces, separated at intervals by steep slope segments. Terraces shorten the
uninterrupted flow lengths on steep slopes, helping to reduce the
development of rills and gullies.
Retaining walls, gabions, cribbing, deadman anchors, rock-filled slope
mattresses, and other types of soil
retention systems can be used in terracing.
Appropriate Uses
Terracing techniques are most typically used to control erosion on slopes that are steeper than 4:1.
Design and Installation
Design details with notes are provided in Detail TER-1.
The type, number, and spacing of terraces will depend on the slope, slope length, and other factors. The
Revised Universal Soil Loss Equation (RUSLE) may be helpful in determining spacing of terraces on slopes. Terracing should be used in combination with other stabilization measures that provide cover for
exposed soils such as mulching, seeding, surface roughening, or other measures.
Maintenance and Removal
Repair rill erosion on slopes and remove accumulated sediment, as needed. Terracing may be temporary
or permanent. If terracing is temporary, the slope should be topsoiled, seeded, and mulched when the slope is graded to its final configuration and terraces are removed. Due to the steepness of the slope, once
terraces are graded, erosion control blankets or other stabilization measures are typically required. If
terraces are permanent, vegetation should be established on slopes and terraces as soon as practical.
Terracing
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-11 Terracing (TER)
TER-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Check Dams (CD) EC-12
November 2010 Urban Drainage and Flood Control District CD-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CD-1. Rock check dams in a roadside ditch. Photo courtesy of WWE.
Description
Check dams are temporary grade control
structures placed in drainage channels to limit the erosivity of stormwater by reducing flow velocity. Check dams are
typically constructed from rock, gravel bags, sand bags, or sometimes,
proprietary devices. Reinforced check
dams are typically constructed from rock and wire gabion. Although the primary
function of check dams is to reduce the
velocity of concentrated flows, a secondary benefit is sediment trapping
upstream of the structure.
Appropriate Uses
Use as a grade control for temporary drainage ditches or swales until final soil stabilization measures are
established upstream and downstream. Check dams can be used on mild or moderately steep slopes. Check dams may be used under the following conditions:
As temporary grade control facilities along waterways until final stabilization is established.
Along permanent swales that need protection prior to installation of a non-erodible lining.
Along temporary channels, ditches or swales that need protection where construction of a non-
erodible lining is not practicable.
Reinforced check dams should be used in areas subject to high flow velocities.
Design and Installation
Place check dams at regularly spaced intervals along the drainage swale or ditch. Check dams heights should allow for pools to develop upstream of each check dam, extending to the downstream toe of the
check dam immediately upstream.
When rock is used for the check dam, place rock mechanically or by hand. Do not dump rocks into the drainage channel. Where multiple check dams are used, the top of the lower dam should be at the same
elevation as the toe of the upper dam.
When reinforced check dams are used, install erosion control fabric under and around the check dam to prevent erosion on the upstream and downstream sides. Each
section of the dam should be keyed in to reduce the potential for washout or undermining. A rock apron upstream and downstream of the dam may be necessary to further control
erosion.
Check Dams
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management No
EC-12 Check Dams (CD)
CD-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Design details with notes are provided for the following types of check dams:
Rock Check Dams (CD-1)
Reinforced Check Dams (CD-2)
Sediment control logs may also be used as check dams; however, silt fence is not appropriate for use as a check dam. Many jurisdictions also prohibit or discourage use of straw bales for this purpose.
Maintenance and Removal
Replace missing rocks causing voids in the check dam. If gravel bags or sandbags are used, replace or
repair torn or displaced bags.
Remove accumulated sediment, as needed to maintain BMP effectiveness, typically before the sediment depth upstream of the check dam is within ½ of the crest height. Remove accumulated sediment prior to
mulching, seeding, or chemical soil stabilization. Removed sediment can be incorporated into the
earthwork with approval from the Project Engineer, or disposed of at an alternate location in accordance with the standard specifications.
Check dams constructed in permanent swales should be removed when perennial grasses have become established, or immediately prior to installation of a non-erodible lining. All of the rock and accumulated sediment should be removed, and the area seeded and mulched, or otherwise stabilized.
Check Dams (CD) EC-12
November 2010 Urban Drainage and Flood Control District CD-3
Urban Storm Drainage Criteria Manual Volume 3
EC-12 Check Dams (CD)
CD-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Check Dams (CD) EC-12
November 2010 Urban Drainage and Flood Control District CD-5
Urban Storm Drainage Criteria Manual Volume 3
EC-12 Check Dams (CD)
CD-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Streambank Stabilization (SS) EC-13
November 2010 Urban Drainage and Flood Control District SS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SS-1. Streambank stabilization using geotextiles following installation of a permanent in-stream grade control structure.
Description
Streambank stabilization involves a
combination of erosion and sediment control practices to protect streams, banks, and in-stream habitat from
accelerated erosion. BMPs associated with streambank stabilization may
include protection of existing
vegetation, check dams/grade control, temporary and permanent seeding,
outlet protection, rolled erosion control
products, temporary diversions, dewatering operations and
bioengineering practices such as brush
layering, live staking and fascines.
Appropriate Uses
Streambank stabilization may be a construction activity in and of itself, or it may be in conjunction with a broader construction project that discharges to a waterway that is susceptible to accelerated erosion due to
increases in the rate and volume of stormwater runoff. Depending on the health of the stream, water
quality sampling and testing may be advisable prior to and/or during construction to evaluate health and stability of the stream and potential effects from adjacent construction activities.
Design and Installation
Streambank stabilization consists of protecting the stream in a variety of ways to minimize negative
effects to the stream environment. The following lists the minimum requirements necessary for
construction streambank stabilization:
Protect existing vegetation along the stream bank in accordance with the Vegetated Buffers and
Protection of Existing Vegetation Fact Sheets. Preserving a riparian buffer along the streambank will
help to remove sediment and decrease runoff rates from the disturbed area.
Outside the riparian buffer, provide sediment control in the form of a silt fence or equivalent sediment
control practice along the entire length of the stream that will receive runoff from the area of disturbance. In some cases, a double-layered perimeter control may be justified adjacent to sensitive receiving waters and wetlands to provide additional protection.
Stabilize all areas that will be draining to the stream. Use rolled erosion control products, temporary or permanent seeding, or other appropriate measures.
Ensure all point discharges entering the stream are
adequately armored with a velocity dissipation device and appropriate outlet protection.
See individual design details and notes for the various BMPs
referenced in this practice. Additional information on bioengineering techniques for stream stabilization can be
Streambank Stabilization
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
EC-13 Streambank Stabilization (SS)
SS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
found in the Major Drainage chapter of Volume 1 and additional guidance on BMPs for working in waterways can be found in UDFCD’s Best Management Practices for Construction in Waterways
Training Manual.
Maintenance and Removal
Inspect BMPs protecting the stream for damage on a daily basis. Maintain, repair, or replace damaged
BMPs following the guidance provided in individual BMP Fact Sheets for practices that are implemented. Some streambank stabilization BMPs are intended to remain in place as vegetation matures (e.g. erosion
control blankets protecting seeded stream banks and turf reinforcement mats).
For BMPs that are not to remain in place as a part of final stabilization such as silt fence and other temporary measures, BMPs should be removed when all land disturbing activities have ceased and areas
have been permanently stabilized.
Wind Erosion/Dust Control (DC) EC-14
November 2010 Urban Drainage and Flood Control District DC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph DC-1. Water truck used for dust suppression. Photo courtesy of Douglas County.
Description
Wind erosion and dust control BMPs
help to keep soil particles from entering the air as a result of land disturbing construction activities. These BMPs
include a variety of practices generally focused on either graded disturbed areas
or construction roadways. For graded
areas, practices such as seeding and mulching, use of soil binders, site
watering, or other practices that provide
prompt surface cover should be used. For construction roadways, road
watering and stabilized surfaces should
be considered.
Appropriate Uses
Dust control measures should be used on any site where dust poses a problem to air quality. Dust control is important to control for the health of construction workers and surrounding waterbodies.
Design and Installation
The following construction BMPs can be used for dust control:
An irrigation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil
particles from becoming airborne.
Seeding and mulching can be used to stabilize disturbed surfaces and reduce dust emissions.
Protecting existing vegetation can help to slow wind velocities across the ground surface, thereby
limiting the likelihood of soil particles to become airborne.
Spray-on soil binders form a bond between soil particles keeping them grounded. Chemical
treatments may require additional permitting requirements. Potential impacts to surrounding
waterways and habitat must be considered prior to use.
Placing rock on construction roadways and entrances will help keep dust to a minimum across the
construction site.
Wind fences can be installed on site to reduce wind speeds. Install fences perpendicular to the prevailing
wind direction for maximum effectiveness.
Maintenance and Removal
When using an irrigation/sprinkler control system to aid in dust control, be careful not to overwater. Overwatering will cause construction vehicles to track mud off-site.
Wind Erosion Control/
Dust Control
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management Moderate
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CWA-1. Example of concrete washout area. Note gravel tracking pad for access and sign.
Description
Concrete waste management involves
designating and properly managing a specific area of the construction site as a concrete washout area. A concrete
washout area can be created using one of several approaches designed to receive
wash water from washing of tools and
concrete mixer chutes, liquid concrete waste from dump trucks, mobile batch
mixers, or pump trucks. Three basic
approaches are available: excavation of a pit in the ground, use of an above ground
storage area, or use of prefabricated haul-
away concrete washout containers. Surface discharges of concrete washout
water from construction sites are prohibited.
Appropriate Uses
Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid
concrete waste from onsite concrete mixing or concrete delivery.
Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete
washout, the soil must have adequate buffering capacity to result in protection of state groundwater standards; otherwise, a liner/containment must be used. The following management practices are recommended to prevent an impact from unlined pits to groundwater:
The use of the washout site should be temporary (less than 1 year), and
The washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands.
Design and Installation
Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface
waters or stormwater runoff. Concrete washout areas may be lined or unlined excavated pits in the ground, commercially manufactured prefabricated washout containers, or aboveground holding areas constructed of berms, sandbags or straw bales with a plastic liner.
Although unlined washout areas may be used, lined pits may be required to protect groundwater under certain conditions.
Do not locate an unlined washout area within 400 feet
of any natural drainage pathway or waterbody or within 1,000 feet of any wells or drinking water sources. Even for lined concrete washouts, it is
advisable to locate the facility away from waterbodies and drainage paths. If site constraints make these
Concrete Washout Area
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-1 Concrete Washout Area (CWA)
CWA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
setbacks infeasible or if highly permeable soils exist in the area, then the pit must be installed with an impermeable liner (16 mil minimum thickness) or surface storage alternatives using prefabricated
concrete washout devices or a lined aboveground storage area should be used.
Design details with notes are provided in Detail CWA-1 for pits and CWA-2 for aboveground storage areas. Pre-fabricated concrete washout container information can be obtained from vendors.
Maintenance and Removal
A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is being used, as opposed to washout in non-designated areas of the site.
Remove concrete waste in the washout area, as needed to maintain BMP function (typically when filled to
about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal location.
Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any
contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. If the wash water is allowed to evaporate and the concrete hardens, it may be recycled.
Photograph CWA-3. Earthen concrete washout. Photo courtesy of CDOT. Photograph CWA-2. Prefabricated concrete washout. Photo courtesy of CDOT.
Concrete Washout Area (CWA) MM-1
November 2010 Urban Drainage and Flood Control District CWA-3
Urban Storm Drainage Criteria Manual Volume 3
MM-1 Concrete Washout Area (CWA)
CWA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SP-1. A topsoil stockpile that has been partially revegetated and is protected by silt fence perimeter control.
Description
Stockpile management includes
measures to minimize erosion and sediment transport from soil stockpiles.
Appropriate Uses
Stockpile management should be used when soils or other erodible materials
are stored at the construction site. Special attention should be given to stockpiles in close proximity to natural
or manmade storm systems.
Design and Installation
Locate stockpiles away from all drainage system components including storm sewer inlets. Where practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the
phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such
as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a stabilized designated access point on the upgradient side of the stockpile.
Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should
be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14
days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are
"typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that
may be more prescriptive.
Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be
protected.
Maintenance and Removal
Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets.
Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be necessary.
When temporary removal of a perimeter BMP is necessary to access a stockpile, ensure BMPs are reinstalled in accordance with their respective design detail section.
Stockpile Management
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management Yes
MM-2 Stockpile Management (SM)
SP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise stabilize the ground surface where the stockpile was located.
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-3
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management (SP) MM-2
November 2010 Urban Drainage and Flood Control District SP-5
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM)
SP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs GH-1 and GH-2. Proper materials
storage and secondary containment for fuel tanks are important good housekeeping practices. Photos courtesy of CDOT and City of Aurora.
Description
Implement construction site good housekeeping practices to
prevent pollution associated with solid, liquid and hazardous construction-related materials and wastes. Stormwater Management Plans (SWMPs) should clearly specify BMPs
including these good housekeeping practices:
Provide for waste management.
Establish proper building material staging areas.
Designate paint and concrete washout areas.
Establish proper equipment/vehicle fueling and
maintenance practices.
Control equipment/vehicle washing and allowable non-stormwater discharges.
Develop a spill prevention and response plan.
Acknowledgement: This Fact Sheet is based directly on EPA guidance provided in Developing Your Stormwater Pollution Prevent Plan (EPA 2007).
Appropriate Uses
Good housekeeping practices are necessary at all construction sites.
Design and Installation
The following principles and actions should be addressed in SWMPs:
Provide for Waste Management. Implement management procedures and practices to prevent or reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the site. Practices such as trash disposal, recycling, proper material handling,
and cleanup measures can reduce the potential for stormwater runoff to pick up construction site wastes and discharge them to surface waters. Implement a comprehensive set of waste-management
practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides, wood preservatives, acids, roofing tar, and other materials. Practices should include storage, handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be
considered include:
Solid or Construction Waste
o Designate trash and bulk waste-collection areas on-
site.
Good Housekeeping
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
MM-3 Good Housekeeping Practices (GH)
GH-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GH-3. Locate portable toilet facilities on level surfaces away from waterways and storm drains. Photo courtesy of WWE.
o Recycle materials whenever possible (e.g., paper, wood, concrete, oil).
o Segregate and provide proper disposal options for hazardous material wastes.
o Clean up litter and debris from the construction site daily.
o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-collection areas (dumpsters, and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges.
o Empty waste containers before they are full and overflowing.
Sanitary and Septic Waste
o Provide convenient, well-maintained, and properly located toilet facilities on-site.
o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintain clean restroom facilities and empty portable toilets regularly.
o Where possible, provide secondary containment pans under portable toilets.
o Provide tie-downs or stake-downs for portable toilets.
o Educate employees, subcontractors, and suppliers on locations of facilities.
o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
o Inspect facilities for leaks. If found, repair or replace immediately.
o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are
not spilled on the ground.
Hazardous Materials and Wastes
o Develop and implement employee and
subcontractor education, as needed, on
hazardous and toxic waste handling, storage, disposal, and cleanup.
o Designate hazardous waste-collection
areas on-site.
o Place all hazardous and toxic material
wastes in secondary containment.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-3
Urban Storm Drainage Criteria Manual Volume 3
o Hazardous waste containers should be inspected to ensure that all containers are labeled properly and that no leaks are present.
Establish Proper Building Material Handling and Staging Areas. The SWMP should include
comprehensive handling and management procedures for building materials, especially those that are hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building
materials that have the potential to contaminate stormwater should be stored indoors or under cover
whenever possible or in areas with secondary containment. Secondary containment measures prevent a spill from spreading across the site and may include dikes, berms, curbing, or other containment
methods. Secondary containment techniques should also ensure the protection of groundwater.
Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and other potential pollutants. Designated staging areas enable easier monitoring of the use of materials
and clean up of spills. Training employees and subcontractors is essential to the success of this
pollution prevention principle. Consider the following specific materials handling and staging practices:
o Train employees and subcontractors in proper handling and storage practices.
o Clearly designate site areas for staging and storage with signs and on construction drawings. Staging areas should be located in areas central to the construction site. Segment the staging area
into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle
tracking controls (See Vehicle Tracking Control Fact Sheet).
o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC) requirements and plans and provide cover and impermeable perimeter control, as necessary, for
hazardous materials and contaminated soils that must be stored on site.
o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation failure, or other signs of deterioration and tested for soundness.
o Reuse and recycle construction materials when possible.
Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout facilities at their own plants or dispatch facilities when feasible; however, concrete washout
commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on-site, designate specific washout areas and design facilities to handle anticipated washout water. Washout areas should also be provided for paint and stucco operations. Because washout areas can
be a source of pollutants from leaks or spills, care must be taken with regard to their placement and proper use. See the Concrete Washout Area Fact Sheet for detailed guidance.
Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint,
and stucco work are occurring on large portions of the site. Be sure to check for evidence that contractors are using the washout areas and not dumping materials onto the ground or into drainage facilities. If the washout areas are not being used regularly, consider posting additional signage,
relocating the facilities to more convenient locations, or providing training to workers and contractors.
When concrete, paint, or stucco is part of the construction process, consider these practices which will
help prevent contamination of stormwater. Include the locations of these areas and the maintenance and inspection procedures in the SWMP.
MM-3 Good Housekeeping Practices (GH)
GH-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained areas, or streams. Only use designated washout areas.
o Establish washout areas and advertise their locations with signs. Ensure that signage remains in
good repair.
o Provide adequate containment for the amount of wash water that will be used.
o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be
removed.
o Dispose of materials properly. The preferred method is to allow the water to evaporate and to
recycle the hardened concrete. Full service companies may provide dewatering services and
should dispose of wastewater properly. Concrete wash water can be highly polluted. It should not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system without first receiving written permission from the system operator.
Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly
designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and
maintenance activities in a covered area. Consider the following practices to help prevent the
discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the locations of designated fueling and maintenance areas and inspection and maintenance procedures in the SWMP.
o Train employees and subcontractors in proper fueling procedures (stay with vehicles during fueling, proper use of pumps, emergency shutoff valves, etc.).
o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service
problems.
o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses
to prevent stormwater run-on and runoff.
o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids.
o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and
recycle fluids whenever possible.
Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement practices to prevent contamination of surface and groundwater from equipment and vehicle wash
water. Representative practices include:
o Educate employees and subcontractors on proper washing procedures.
o Use off-site washing facilities, when available.
o Clearly mark the washing areas and inform workers that all washing must occur in this area.
o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain
separation from drainage paths and waterbodies.
Good Housekeeping Practices (GH) MM-3
November 2010 Urban Drainage and Flood Control District GH-5
Urban Storm Drainage Criteria Manual Volume 3
o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can remove most dirt adequately.
o Do not conduct other activities, such as vehicle repairs, in the wash area.
o Include the location of the washing facilities and the inspection and maintenance procedures in the SWMP.
Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be
identified in the SWMP. Representative procedures include identifying ways to reduce the chance of spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by
spills, and train personnel responsible for spill prevention and response. The plan should also specify
material handling procedures and storage requirements and ensure that clear and concise spill cleanup procedures are provided and posted for areas in which spills may potentially occur. When developing
a spill prevention plan, include the following:
o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface waterbodies on or near the site, and measures to stop spills from leaving the site.
o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data Sheets (MSDSs) for chemical used on site with the SWMP.
o Establish an education program for employees and subcontractors on the potential hazards to
humans and the environment from spills and leaks.
o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or
municipal sewage treatment facilities to request assistance. Emergency procedures and contact
numbers should be provided in the SWMP and posted at storage locations.
o Describe the procedures, equipment and materials for immediate cleanup of spills and proper
disposal.
o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill prevention plan and clean up materials as changes occur to the types of chemicals stored and used
at the facility.
MM-3 Good Housekeeping Practices (GH)
GH-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Spill Prevention, Control, and Countermeasure (SPCC) Plan
Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks.
The facility is subject to this rule if it is a non-transportation-related facility that:
Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity greater than 42,000 gallons.
Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters of the United States and adjoining shorelines.
Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan.
To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm.
Reporting Oil Spills
In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for
assistance, or for more details, visit their website: www.nrc.uscg.mil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designation of personnel responsible for supervising and implementing good housekeeping programs, such as site cleanup and disposal of trash and debris, hazardous material management and disposal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in good housekeeping efforts.
Staging and storage areas require permanent stabilization when the areas are no longer being used for
construction-related activities.
Construction-related materials, debris and waste must be removed from the construction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Details:
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracking Control
Design details are not necessary for other good housekeeping practices; however, be sure to designate where specific practices will occur on the appropriate construction drawings.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-1. Silt fence creates a sediment barrier, forcing sheet flow runoff to evaporate or infiltrate.
Description
A silt fence is a woven geotextile fabric
attached to wooden posts and trenched into the ground. It is designed as a sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
A silt fence can be used where runoff is conveyed from a disturbed area as sheet flow. Silt fence is not designed to
receive concentrated flow or to be used as a filter fabric. Typical uses include:
Down slope of a disturbed area to
accept sheet flow.
Along the perimeter of a receiving
water such as a stream, pond or
wetland.
At the perimeter of a construction site.
Design and Installation
Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum
recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter
control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive conditions parallel to the silt fence.
See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled
out by hand and there should be no gaps between the ground and the fabric.
Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and other specifications in the design details. Improper installation
of silt fence is a common reason for silt fence failure; however, when properly installed and used for the appropriate purposes, it can be highly effective.
Silt Fence
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-1 Silt Fence (SF)
SF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph SF-2. When silt fence is not installed along
the contour, a "J-hook" installation may be appropriate to ensure that the BMP does not create concentrated flow parallel to the silt fence. Photo courtesy of Tom Gore.
Maintenance and Removal
Inspection of silt fence includes observing the
material for tears or holes and checking for slumping fence and undercut areas bypassing flows. Repair of silt fence typically involves replacing the damaged
section with a new section. Sediment accumulated behind silt fence should be removed, as needed to
maintain BMP effectiveness, typically before it
reaches a depth of 6 inches.
Silt fence may be removed when the upstream area
has reached final stabilization.
Silt Fence (SF) SC-1
November 2010 Urban Drainage and Flood Control District SF-3
Urban Storm Drainage Criteria Manual Volume 3
SC-1 Silt Fence (SF)
SF-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-1
Urban Storm Drainage Criteria Manual Volume 3
Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a perimeter control around a soil stockpile; and, 2) as a "J-hook"
perimeter control at the corner of a construction site.
Description
A sediment control log is a linear roll
made of natural materials such as straw, coconut fiber, or other fibrous material trenched into the ground and
held with a wooden stake. Sediment control logs are also often referred to
as "straw wattles." They are used as a
sediment barrier to intercept sheet flow runoff from disturbed areas.
Appropriate Uses
Sediment control logs can be used in
the following applications to trap
sediment:
As perimeter control for stockpiles
and the site.
As part of inlet protection designs.
As check dams in small drainage
ditches. (Sediment control logs
are not intended for use in channels with high flow
velocities.)
On disturbed slopes to shorten flow lengths (as an erosion control).
As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland.
Sediment control logs work well in combination with other layers of erosion and sediment controls.
Design and Installation
Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to sediment control logs installed along the contour. When installed for other uses, such as
perimeter control, it should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and
evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the BMP.
Sediment Control Log
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management No
SC-2 Sediment Control Log (SCL)
SCL-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become a barrier and should be installed is if they are impermeable.
Design details and notes for sediment control logs are provided in Detail SCL-1. Sediment logs must be
properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to
flow).
Improper installation can lead to poor performance. Be sure that sediment control logs are properly trenched, anchored and tightly jointed.
Maintenance and Removal
Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the
depth is one-half the height of the sediment log and repair damage to the sediment log, typically by
replacing the damaged section.
Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath
the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may
occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as permanent slope breaks). However, removal of sediment control logs after final stabilization is typically
recommended when used in perimeter control, inlet protection and check dam applications.
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-3
Urban Storm Drainage Criteria Manual Volume 3
SC-2 Sediment Control Log (SCL)
SCL-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC-2
November 2010 Urban Drainage and Flood Control District SCL-5
Urban Storm Drainage Criteria Manual Volume 3
Brush Barrier (BB) SC-4
November 2010 Urban Drainage and Flood Control District BB-1
Urban Storm Drainage Criteria Manual Volume 3
Description
A brush barrier is a perimeter sediment
control constructed with stacked shrubs, tree limbs, and bushy vegetation that has been cleared from a construction area.
Brush barriers reduce sediment loads by intercepting and slowing sheet flow
from disturbed areas.
Appropriate Uses
A brush barrier is an appropriate BMP at
sites where there is adequate brush from the clearing and grubbing of the
construction site to construct an
effective brush barrier. Brush barriers are typically used at the toe of slopes and
should be implemented in combination
with other BMPs such as surface roughening and reseeding. Brush barriers should be considered short-term, supplemental BMPs because
they are constructed of materials that naturally decompose. Brush barriers are not acceptable as a sole
means of perimeter control, but they may be used internally within a site to reduce slope length or at the site perimeter in combination with other perimeter control BMPs for multi-layered protection.
Brush barriers are not appropriate for high-velocity flow areas. A large amount of material is needed to construct a useful brush barrier; therefore, alternative perimeter controls such as a fabric silt fence may be more appropriate for sites with little material from clearing.
Design and Installation
The drainage area for brush barriers should be no greater than 0.25 acre per 100 feet of barrier length.
Additionally, the drainage slope leading down to a brush barrier must be no greater than 3:1 and no longer
than 150 feet.
To construct an effective brush barrier, use only small shrubs and limbs with diameters of 6 inches or less.
Larger materials (such as a tree stump) can create void spaces in the barrier, making it ineffective. The brush barrier mound should be at least 3 feet high and 5 feet wide at its base.
In order to avoid significant movement of the brush and improve effectiveness, a filter fabric can be
placed over the top of the brush pile, keyed in on the upstream side, and anchored on the downstream side. On the upgradient side, the filter fabric cover should be buried in a trench 4 inches deep and 6 inches wide.
Brush Barrier
Functions
Erosion Control Moderate
Sediment Control Moderate
Site/Material
No
Photograph BB-1. Brush barrier constructed with chipped wood. Photo courtesy of EPA.
SC-4 Brush Barrier (BB)
BB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Inspect the brush barrier for voids where concentrated flow or erosion is occurring. Voids in the brush
barrier should be filled with additional brush. Accumulated sediment should be removed from the uphill side of the barrier when sediment height reaches one-third of the height of the barrier.
If filter fabric is used, inspect the filter fabric for damage; replace and properly secure it, as needed.
Once the upstream area has been vegetated or stabilized, the brush barrier should be removed and the underlying area revegetated.
Rock Sock (RS) SC-5
November 2010 Urban Drainage and Flood Control District RS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph RS-1. Rock socks placed at regular intervals in a curb line can help reduce sediment loading to storm sewer inlets. Rock socks can also be used as perimeter controls.
Description
A rock sock is constructed of gravel
that has been wrapped by wire mesh or a geotextile to form an elongated cylindrical filter. Rock socks are
typically used either as a perimeter control or as part of inlet protection.
When placed at angles in the curb line,
rock socks are typically referred to as curb socks. Rock socks are intended to
trap sediment from stormwater runoff
that flows onto roadways as a result of construction activities.
Appropriate Uses
Rock socks can be used at the perimeter
of a disturbed area to control localized
sediment loading. A benefit of rock socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the
ground; therefore, they are often used on roadway construction projects where paved surfaces are present.
Use rock socks in inlet protection applications when the construction of a roadway is substantially complete and the roadway has been directly connected to a receiving storm system.
Design and Installation
When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per
100 lineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and
a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are
used for inlet protection and in the curb line.
When placed in the gutter adjacent to a curb, rock socks should protrude no more than two feet from the curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert
drivers and street maintenance workers of their presence.
Maintenance and Removal
Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to maintain the functionality of the BMP, typically when sediment
has accumulated behind the rock sock to one-half of the sock's height.
Once upstream stabilization is complete, rock socks and
accumulated sediment should be removed and properly disposed.
Rock Sock
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-5 Rock Sock (RS)
RS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rock Sock (RS) SC-5
November 2010 Urban Drainage and Flood Control District RS-3
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph IP-1. Inlet protection for a curb opening inlet.
Description
Inlet protection consists of permeable
barriers installed around an inlet to filter runoff and remove sediment prior to entering a storm drain inlet. Inlet
protection can be constructed from rock socks, sediment control logs, silt fence,
block and rock socks, or other materials
approved by the local jurisdiction. Area inlets can also be protected by
over-excavating around the inlet to
form a sediment trap.
Appropriate Uses
Install protection at storm sewer inlets that are operable during construction.
Consider the potential for tracked-out
sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets must be protected. This may include inlets in the general proximity of the construction area, not limited
to downgradient inlets. Inlet protection is not
Design and Installation
a stand-alone BMP and should be used in conjunction with
other upgradient BMPs.
To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet
to function without completely blocking flows into the inlet in a manner that causes localized flooding.
When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other
site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a curb and gutter setting, but are effective area inlet protection measures.
Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary products are available for inlet protection that may be approved for use by local governments. If proprietary products are used, design details and installation procedures from the manufacturer must be
followed. Regardless of the type of inlet protection selected, inlet protection is most effective when combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier
before runoff enters the storm sewer or receiving water.
Design details with notes are provided for these forms of inlet protection:
IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade
Inlets
IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade
Inlets
Inlet Protection
(various forms)
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-6 Inlet Protection (IP)
IP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
IP-3. Rock Sock Inlet Protection for Sump/Area Inlet
IP-4. Silt Fence Inlet Protection for Sump/Area Inlet
IP-5. Over-excavation Inlet Protection
IP-6. Straw Bale Inlet Protection for Sump/Area Inlet
CIP-1. Culvert Inlet Protection
Propriety inlet protection devices should be installed in accordance with manufacturer specifications.
More information is provided below on selecting inlet protection for sump and on-grade locations.
Inlets Located in a Sump
When applying inlet protection in sump conditions, it is important that the inlet continue to function
during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower than the top of the curb opening to allow overflow into the inlet during larger storms without excessive
localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter
becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing localized flooding, public safety issues, and downstream erosion and damage from bypassed flows.
Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and
rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary
products providing equivalent functions.
Inlets Located on a Slope
For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended
in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads,
also see the Check Dam Fact Sheet.
Maintenance and Removal
Inspect inlet protection frequently. Inspection and maintenance guidance includes:
Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents of the BMP (e.g., gravel) washing into the inlet.
Check for improper installation resulting in untreated flows bypassing the BMP and directly entering the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been
properly trenched around the inlet can result in flows under the silt fence and directly into the inlet.
Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also
crush or displace the BMP.
Monitor sediment accumulation upgradient of the inlet protection.
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-3
Urban Storm Drainage Criteria Manual Volume 3
Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet
protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches.
Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain the functionality of the BMP.
Propriety inlet protection devices should be inspected and maintained in accordance with
manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed in a timely manner to prevent devices from breaking and spilling sediment into the storm drain.
Inlet protection must be removed and properly disposed of when the drainage area for the inlet has
reached final stabilization.
SC-6 Inlet Protection (IP)
IP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-5
Urban Storm Drainage Criteria Manual Volume 3
SC-6 Inlet Protection (IP)
IP-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
November 2010 Urban Drainage and Flood Control District IP-7
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SB-1. Sediment basin at the toe of a slope. Photo courtesy of WWE.
Description
A sediment basin is a temporary pond
built on a construction site to capture eroded or disturbed soil transported in storm runoff prior to discharge from the
site. Sediment basins are designed to capture site runoff and slowly release it to
allow time for settling of sediment prior
to discharge. Sediment basins are often constructed in locations that will later be
modified to serve as post-construction
stormwater basins.
Appropriate Uses
Most large construction sites (typically greater than 2 acres) will require one or
more sediment basins for effective
management of construction site runoff. On linear construction projects, sediment basins may be impractical; instead, sediment traps or other combinations of BMPs may be more appropriate.
Sediment basins should not be used as stand-alone sediment controls. Erosion and other sediment
controls should also be implemented upstream.
When feasible, the sediment basin should be installed in the same location where a permanent post-
construction detention pond will be located.
Design and Installation
The design procedure for a sediment basin includes these steps:
Basin Storage Volume: Provide a storage volume of at least 3,600 cubic feet per acre of drainage area. To the extent practical, undisturbed and/or off-site areas should be diverted around sediment
basins to prevent “clean” runoff from mixing with runoff from disturbed areas. For undisturbed areas (both on-site and off-site) that cannot be diverted around the sediment basin, provide a minimum of 500 ft3/acre of storage for undeveloped (but stable) off-site areas in addition to the 3,600 ft3/acre for
disturbed areas. For stable, developed areas that cannot be diverted around the sediment basin, storage volume requirements are summarized in Table SB-1.
Basin Geometry: Design basin with a minimum length-to-width ratio of 2:1 (L:W). If this cannot be
achieved because of site space constraints, baffling may be required to extend the effective distance between the
inflow point(s) and the outlet to minimize short-circuiting.
Dam Embankment: It is recommended that embankment slopes be 4:1 (H:V) or flatter and no steeper
than 3:1 (H:V) in any location.
Sediment Basins
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-7 Sediment Basin (SB)
SB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Inflow Structure: For concentrated flow entering the basin, provide energy dissipation at the point of inflow.
Table SB-1. Additional Volume Requirements for Undisturbed and Developed TributaryAreas Draining through Sediment Basins
Imperviousness (%) Additional Storage Volume (ft3) Per Acre of Tributary Area
Undeveloped 500
10 800
20 1230
30 1600
40 2030
50 2470
60 2980
70 3560
80 4360
90 5300
100 6460
Outlet Works: The outlet pipe shall extend through the embankment at a minimum slope of 0.5 percent. Outlet works can be designed using one of the following approaches:
o Perforated Riser/Plate: Follow the design criteria for Full Spectrum Detention outlets in the EDB BMP Fact Sheet provided in Chapter 4 of this manual for sizing of outlet perforations with
an emptying time of approximately 72 hours. In lieu of the well-screen trash rack, pack
uniformly sized 1½ - to 2-inch gravel in front of the plate. This gravel will need to be cleaned out frequently during the construction period as sediment accumulates within it. The gravel pack will
need to be removed and disposed of following construction to reclaim the basin for use as a
permanent detention facility. If the basin will be used as a permanent extended detention basin for the site, a well-screen trash rack will need to be installed once contributing drainage areas
have been stabilized and the gravel pack and accumulated sediment have been removed.
o Floating Skimmer: If a floating skimmer is used, install it using manufacturer’s recommendations. Illustration SB-1 provides an illustration of a Faircloth Skimmer Floating
Outlet™, one of the more commonly used floating skimmer outlets. A skimmer should be designed to release the design volume in no less than 48 hours. The use of a floating skimmer outlet can increase the sediment capture efficiency of a basin significantly. A floating outlet
continually decants cleanest water off the surface of the pond and releases cleaner water than would discharge from a perforated riser pipe or plate.
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-3
Urban Storm Drainage Criteria Manual Volume 3
Illustration SB-1. Outlet structure for a temporary sediment basin - Faircloth Skimmer Floating Outlet. Illustration courtesy of J. W. Faircloth & Sons, Inc., FairclothSkimmer.com.
o Outlet Protection: Outlet protection should be provided where the velocity of flow will exceed the maximum permissible velocity of the material of the waterway into which discharge occurs. This may require the use of a riprap apron at the outlet location and/or other measures to keep the
waterway from eroding.
o Emergency Spillway: Provide a stabilized emergency overflow spillway for rainstorms that
exceed the capacity of the sediment basin volume and its outlet. Protect basin embankments from
erosion and overtopping. If the sediment basin will be converted to a permanent detention basin, design and construct the emergency spillway(s) as required for the permanent facility. If the
sediment basin will not become a permanent detention basin, it may be possible to substitute a
heavy polyvinyl membrane or properly bedded rock cover to line the spillway and downstream embankment, depending on the height, slope, and width of the embankments.
Maintenance and Removal
Maintenance activities include the following:
• Dredge sediment from the basin, as needed to maintain BMP effectiveness, typically when the design storage volume is no more than one-third filled with sediment.
• Inspect the sediment basin embankments for stability and seepage.
• Inspect the inlet and outlet of the basin, repair damage, and remove debris. Remove, clean and
replace the gravel around the outlet on a regular basis to remove the accumulated sediment within it
and keep the outlet functioning.
• Be aware that removal of a sediment basin may require dewatering and associated permit
requirements.
• Do not remove a sediment basin until the upstream area has been stabilized with vegetation.
SC-7 Sediment Basin (SB)
SB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Final disposition of the sediment basin depends on whether the basin will be converted to a permanent post-construction stormwater basin or whether the basin area will be returned to grade. For basins being
converted to permanent detention basins, remove accumulated sediment and reconfigure the basin and
outlet to meet the requirements of the final design for the detention facility. If the sediment basin is not to be used as a permanent detention facility, fill the excavated area with soil and stabilize with vegetation.
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-5
Urban Storm Drainage Criteria Manual Volume 3
SC-7 Sediment Basin (SB)
SB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB) SC-7
November 2010 Urban Drainage and Flood Control District SB-7
Urban Storm Drainage Criteria Manual Volume 3
Sediment Trap (ST) SC-8
November 2010 Urban Drainage and Flood Control District ST-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph ST-1. Sediment traps are used to collect sediment-laden
runoff from disturbed area. Photo courtesy of EPA Menu of BMPs.
Description
Sediment traps are formed by excavating
an area or by placing an earthen embankment across a low area or drainage swale. Sediment traps are
designed to capture drainage from disturbed areas less than one acre and
allow settling of sediment.
Appropriate Uses
Sediment traps can be used in
combination with other layers of erosion and sediment controls to trap sediment
from small drainage areas (less than one
acre) or areas with localized high sediment loading. For example, sediment traps are often provided in conjunction with vehicle tracking controls and wheel wash facilities.
Design and Installation
A sediment trap consists of a small excavated basin with an earthen berm and a riprap outlet. The berm of the sediment trap may be constructed from the excavated material and must be compacted to
95 percent of the maximum density in accordance with ASTM D698. An overflow outlet must be provided at an elevation at least 6 inches below the top of the berm. See Detail ST-1 for additional design
and installation information.
Maintenance and Removal
Inspect the sediment trap embankments for stability and seepage.
Remove accumulated sediment as needed to maintain the effectiveness of the sediment trap, typically when the sediment depth is approximately one-half the height of the outflow embankment.
Inspect the outlet for debris and damage. Repair damage to the outlet, and remove all obstructions.
A sediment trap should not be removed until the upstream area is sufficiently stabilized. Upon removal of the trap, the disturbed area should be covered with topsoil and stabilized.
Sediment Trap
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management No
SC-8 Sediment Trap (ST)
ST-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Trap (ST) SC-8
November 2010 Urban Drainage and Flood Control District ST-3
Urban Storm Drainage Criteria Manual Volume 3
Vegetated Buffers (VB) SC-9
November 2010 Urban Drainage and Flood Control District VB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VB-1. A vegetated buffer is maintained between the area of active construction and the drainage swale. Photo courtesy of WWE.
Description
Buffer strips of preserved natural
vegetation or grass help protect waterways and wetlands from land disturbing activities. Vegetated buffers
improve stormwater runoff quality by straining sediment, promoting
infiltration, and slowing runoff
velocities.
Appropriate Uses
Vegetated buffers can be used to separate land disturbing activities and
natural surface waters or conveyances.
In many jurisdictions, local governments require some type of setback from natural waterways. Concentrated flow should not be directed through
a buffer; instead, runoff should be in the form of sheet flow. Vegetated buffers are typically used in
combination with other perimeter control BMPs such as sediment control logs or silt fence for multi-layered protection.
Design and Installation
Minimum buffer widths may vary based on local regulations. Clearly delineate the boundary of the
natural buffer area using construction fencing, silt fence, or a comparable technique. In areas that have
been cleared and graded, vegetated buffers such as sod can also be installed to create or restore a vegetated buffer around the perimeter of the site.
Maintenance and Removal
Inspect buffer areas for signs of erosion such as gullies or rills. Stabilize eroding areas, as needed. If
erosion is due to concentrated flow conditions, it may be necessary to install a level spreader or other
technique to restore sheet flow conditions. Inspect perimeter controls delineating the vegetative buffer and repair or replace as needed.
Vegetated Buffers
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
Chemical Treatment (CT) SC-10
November 2010 Urban Drainage and Flood Control District CT-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CT-1. Proprietary chemical treatment system being
used on a construction site with sensitive receiving waters. Photo courtesy of WWE.
Description
Chemical treatment for erosion and
sediment control can take several forms:
1. Applying chemicals to disturbed surfaces to reduce erosion (these uses
are discussed in the Soil Binders Fact Sheet).
2. Adding flocculants to sedimentation
ponds or tanks to enhance sediment removal prior.
3. Using proprietary barriers or flow-
through devices containing flocculants (e.g., "floc logs").
The use of flocculants as described in No. 2 and No. 3 above will likely require special permitting.
Check with the state permitting agency. See the Soil Binder BMP Fact Sheet for information on surface application of chemical treatments, as described in No. 1.
Appropriate Uses
At sites with fine-grained materials such as clays, chemical addition to sedimentation ponds or tanks can
enhance settling of suspended materials through flocculation.
Prior to selecting and using chemical treatments, it is important to check state and local permit requirements related to their use.
Design and Installation
Due to variations among proprietary chemical treatment methods, design details are not provided for this
BMP. Chemical feed systems for sedimentation ponds, settling tanks and dewatering bags should be
installed and operated in accordance with manufacturer's recommendations and applicable regulations. Alum and chitosan are two common chemicals used as flocculants. Because the potential long-term
impact of these chemicals to natural drainageways is not yet fully understood, the state does not currently
allow chemical addition under the CDPS General Stormwater Construction Discharge Permit. Additional permitting may be necessary, which may include sampling requirements and numeric discharge limits.
Any devices or barriers containing chemicals should be installed following manufacturer's guidelines. Check for state and local jurisdiction usage restrictions and requirements before including these practices in the SWMP and implementing them onsite.
Chemical Treatment
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management No
SC-10 Chemical Treatment (CT)
CT-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Maintenance and Removal
Chemical feed systems for sedimentation ponds or tanks should be maintained in accordance with
manufacturer's recommendations and removed when the systems are no longer being used. Accumulated sediment should be dried and disposed of either at a landfill or in accordance with applicable regulations.
Barriers and devices containing chemicals should be removed and replaced when tears or other damage to
the devices are observed. These barriers should be removed and properly disposed of when the site has been stabilized.
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CP-1. Construction phasing to avoid disturbing the entire area at one time. Photo courtesy of WWE.
Description
Effective construction site management
to minimize erosion and sediment transport includes attention to construction phasing, scheduling, and
sequencing of land disturbing activities. On most construction projects, erosion
and sediment controls will need to be
adjusted as the project progresses and should be documented in the SWMP.
Construction phasing refers to
disturbing only part of a site at a time to limit the potential for erosion from
dormant parts of a site. Grading
activities and construction are completed and soils are effectively stabilized on one
part of a site before grading and
construction begins on another portion of the site.
Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of
land disturbing activities and the installation of erosion and sediment control practices.
Appropriate Uses
All construction projects can benefit from upfront planning to phase and sequence construction activities
to minimize the extent and duration of disturbance. Larger projects and linear construction projects may benefit most from construction sequencing or phasing, but even small projects can benefit from
construction sequencing that minimizes the duration of disturbance.
Typically, erosion and sediment controls needed at a site will change as a site progresses through the major phases of construction. Erosion and sediment control practices corresponding to each phase of
construction must be documented in the SWMP.
Design and Installation
BMPs appropriate to the major phases of development should be identified on construction drawings. In some cases, it will be necessary to provide several drawings showing construction-phase BMPs placed according to stages of development (e.g., clearing and grading, utility installation, active construction,
final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area associated with phases of a construction project. Additionally, requirements for phased construction drawings vary among local governments within the UDFCD boundary. Some local governments require
separate erosion and sediment control drawings for initial BMPs, interim conditions (in active construction), and final
stabilization.
Construction Scheduling
Functions
Erosion Control Moderate
Sediment Control Moderate
Site/Material Management Yes
SM-1 Construction Phasing/Sequencing (CP)
CP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Typical construction phasing BMPs include:
Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a
100-acre subdivision might be constructed in five phases of 20 acres each.
If there is carryover of stockpiled material from one phase to the next, position carryover material in a location easily accessible for the pending phase that will not require disturbance of stabilized areas to
access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful
planning for location of stockpiles is important.
Typical construction sequencing BMPs include:
Sequence construction activities to minimize duration of soil disturbance and exposure. For example,
when multiple utilities will occupy the same trench, schedule installation so that the trench does not have to be closed and opened multiple times.
Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion
control blankets) as soon as feasible following grading.
Install initial erosion and sediment control practices before construction begins. Promptly install
additional BMPs for inlet protection, stabilization, etc., as construction activities are completed.
Table CP-1 provides typical sequencing of construction activities and associated BMPs.
Maintenance and Removal
When the construction schedule is altered, erosion and sediment control measures in the SWMP and construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the
construction site. Be aware that changes in construction schedules can have significant implications for site stabilization, particularly with regard to establishment of vegetative cover.
Construction Phasing/Sequencing (CP) SM-1
November 2010 Urban Drainage and Flood Control District CP-3
Urban Storm Drainage Criteria Manual Volume 3
Table CP-1. Typical Phased BMP Installation for Construction Projects
Project
Phase BMPs
Pre-
disturbance, Site Access
Install sediment controls downgradient of access point (on paved streets this may consist of inlet protection).
Establish vehicle tracking control at entrances to paved streets. Fence as needed.
Use construction fencing to define the boundaries of the project and limit access to areas of
the site that are not to be disturbed.
Note: it may be necessary to protect inlets in the general vicinity of the site, even if not downgradient, if there is a possibility that sediment tracked from the site could contribute to the inlets.
Site Clearing and Grubbing
Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles,
etc).
Limit disturbance to those areas planned for disturbance and protect undisturbed areas
within the site (construction fence, flagging, etc).
Preserve vegetative buffer at site perimeter.
Create stabilized staging area.
Locate portable toilets on flat surfaces away from drainage paths. Stake in areas
susceptible to high winds.
Construct concrete washout area and provide signage.
Establish waste disposal areas.
Install sediment basins.
Create dirt perimeter berms and/or brush barriers during grubbing and clearing.
Separate and stockpile topsoil, leave roughened and/or cover.
Protect stockpiles with perimeter control BMPs. Stockpiles should be located away from drainage paths and should be accessed from the upgradient side so that perimeter controls
can remain in place on the downgradient side. Use erosion control blankets, temporary seeding, and/or mulch for stockpiles that will be inactive for an extended period.
Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary revegetation for areas of the site that have been disturbed but that will be inactive for an
extended period.
Water to minimize dust but not to the point that watering creates runoff.
SM-1 Construction Phasing/Sequencing (CP)
CP-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Project Phase BMPs
Utility And
Infrastructure Installation
In Addition to the Above BMPs:
Close trench as soon as possible (generally at the end of the day).
Use rough-cut street control or apply road base for streets that will not be promptly paved.
Provide inlet protection as streets are paved and inlets are constructed.
Protect and repair BMPs, as necessary.
Perform street sweeping as needed.
Building Construction
In Addition to the Above BMPs:
Implement materials management and good housekeeping practices for home building
activities.
Use perimeter controls for temporary stockpiles from foundation excavations.
For lots adjacent to streets, lot-line perimeter controls may be necessary at the back of curb.
Final Grading
In Addition to the Above BMPs:
Remove excess or waste materials.
Remove stored materials.
Final Stabilization
In Addition to the Above BMPs:
Seed and mulch/tackify.
Seed and install blankets on steep slopes.
Remove all temporary BMPs when site has reached final stabilization.
Protection of Existing Vegetation (PV) SM-2
November 2010 Urban Drainage and Flood Control District PV-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PV-1. Protection of existing vegetation and a sensitive area. Photo courtesy of CDOT.
Description
Protection of existing vegetation on a
construction site can be accomplished through installation of a construction fence around the area requiring protection.
In cases where upgradient areas are disturbed, it may also be necessary to
install perimeter controls to minimize
sediment loading to sensitive areas such as wetlands. Existing vegetation may be
designated for protection to maintain a
stable surface cover as part of construction phasing, or vegetation may be protected in
areas designated to remain in natural
condition under post-development conditions (e.g., wetlands, mature trees,
riparian areas, open space).
Appropriate Uses
Existing vegetation should be preserved for the maximum practical duration on a construction site
through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and can reduce revegetation costs following construction.
Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas.
If trees are to be protected as part of post-development landscaping, care must be taken to avoid several
types of damage, some of which may not be apparent at the time of injury. Potential sources of injury include soil compaction during grading or due to construction traffic, direct equipment-related injury such as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to
minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be developed during site design, implemented at the beginning of a construction project, as well as continued
during active construction.
Design and Installation
General
Once an area has been designated as a preservation area, there should be no construction activity allowed
within a set distance of the area. Clearly mark the area with construction fencing. Do not allow stockpiles, equipment, trailers or parking within the
protected area. Guidelines to protect various types of existing vegetation follow.
Protection of Existing Vegetation
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management Yes
SM-2 Protection of Existing Vegetation (PV)
PV-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Surface Cover During Phased Construction
Install construction fencing or other perimeter controls around areas to be protected from clearing and grading as part of construction phasing.
Maintaining surface cover on steep slopes for the maximum practical duration during construction is
recommended.
Open Space Preservation
Where natural open space areas will be preserved as part of a development, it is important to install
construction fencing around these areas to protect them from compaction. This is particularly important when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open
space areas should not be used for staging and equipment storage.
Wetlands and Riparian Areas
Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to
prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as
silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland.
Tree Protection1
Before beginning construction operations, establish a tree protection zone around trees to be
preserved by installing construction fences. Allow enough space from the trunk to protect the root zone from soil compaction and mechanical damage, and the branches from mechanical damage (see Table PV-1). If low branches will be kept, place the fence outside of the drip line. Where this is not
possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be aware that about 60 percent of the tree's root zone extends beyond the drip line.
Table PV-1
Guidelines for Determining the Tree Protection Zone (Source: Matheny and Clark, 1998; as cited in GreenCO and WWE 2008)
Distance from Trunk (ft) per inch of DBH
Species Tolerance to Damage Young Mature Over mature
Good 0.5' 0.75' 1.0'
Moderate 0.75' 1.0' 1.25'
Poor 1.0' 1.25' 1.5'
Notes: DBH = diameter at breast height (4.5 ft above grade); Young = <20% of
life expectancy; Mature = 20%-80% of life expectancy; Over mature =>80% of life expectancy
Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection
zone should be avoided where possible because seemingly minor grade changes can either smother
1 Tree Protection guidelines adapted from GreenCO and WWE (2008). Green Industry Best Management Practices (BMPs) for
the Conservation and Protection of Water Resources in Colorado: Moving Toward Sustainability, Third Release. See
www.greenco.org for more detailed guidance on tree preservation.
Protection of Existing Vegetation (PV) SM-2
November 2010 Urban Drainage and Flood Control District PV-3
Urban Storm Drainage Criteria Manual Volume 3
roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to avoid grade changes in the tree protection zone.
Place and maintain a layer of mulch 4 to 6-inch thick from the tree trunk to the fencing, keeping a
6-inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil compaction if construction traffic is unavoidable. When planting operations are completed, the mulch
may be reused throughout planting areas.
Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals
to be dumped, or construction activities to take place except fine grading, irrigation system
installation, and planting operations. These activities should be conducted in consultation with a landscaping professional, following Green Industry BMPs.
Be aware that soil compaction can cause extreme damage to tree health that may appear gradually
over a period of years. Soil compaction is easier to prevent than repair.
Maintenance and Removal
Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area.
If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a
designated preservation area is damaged beyond repair, remove and replace with a 2-inch diameter tree of the same or similar species.
Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of
Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require notification of the USACE.
If damage to vegetation occurs in a protected area, reseed the area with the same or similar species,
following the recommendations in the USDCM Revegetation chapter.
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph CF-1. A construction fence helps delineate areas where existing vegetation is being protected. Photo courtesy of Douglas County.
Description
A construction fence restricts site access
to designated entrances and exits, delineates construction site boundaries, and keeps construction out of sensitive
areas such as natural areas to be preserved as open space, wetlands and
riparian areas.
Appropriate Uses
A construction fence can be used to
delineate the site perimeter and locations within the site where access is restricted
to protect natural resources such as
wetlands, waterbodies, trees, and other natural areas of the site that should not be
disturbed.
If natural resource protection is an objective, then the construction fencing should be used in combination with other perimeter control BMPs such as silt fence, sediment control logs or similar measures.
Design and Installation
Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s
recommendations. See Detail CF-1 for typical installations.
Do not place construction fencing in areas within work limits of machinery.
Maintenance and Removal
Inspect fences for damage; repair or replace as necessary.
Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.
Fencing should be removed once construction is complete.
Construction Fence
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SM-3 Construction Fence (CF)
CF-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Construction Fence (CF) SM-3
November 2010 Urban Drainage and Flood Control District CF-3
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking.
Description
Vehicle tracking controls provide
stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking
control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto
the paved surface.
Appropriate Uses
Implement a stabilized construction
entrance or vehicle tracking control where frequent heavy vehicle traffic exits the
construction site onto a paved roadway. An
effective vehicle tracking control is particularly important during the following conditions:
Wet weather periods when mud is easily tracked off site.
During dry weather periods where dust is a concern.
When poorly drained, clayey soils are present on site.
Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at
particularly muddy sites.
Design and Installation
Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction
vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including:
VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires.
VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance.
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-4 Vehicle Tracking Control (VTC)
VTC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph VTC-2. A vehicle tracking control pad with wheel wash facility. Photo courtesy of Tom Gore.
VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as
hand-held power washing equipment to more advance proprietary systems. When a wheel wash is
provided, it is important to direct wash water to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenance and Removal
Inspect the area for degradation and replace aggregate or material used for a
stabilized entrance/exit as needed. If the area becomes clogged and ponds water,
remove and dispose of excess sediment
or replace material with a fresh layer of aggregate as necessary.
With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way.
Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment
in the roadway indicates that the stabilized construction entrance needs maintenance.
Ensure that drainage ditches at the entrance/exit area remain clear.
A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to
discharge. Also inspect channels conveying the water from the wash area to the sediment trap and
stabilize areas that may be eroding.
When a construction entrance/exit is removed, excess sediment from the aggregate should be removed
and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface
following removal, typically by paving.
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
November 2010 Urban Drainage and Flood Control District VTC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
VTC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stabilized Construction Roadway (SCR) SM-5
November 2010 Urban Drainage and Flood Control District SCR-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SCR-1. Stabilized construction roadway.
Description
A stabilized construction roadway is a
temporary method to control sediment runoff, vehicle tracking, and dust from roads during construction activities.
Appropriate Uses
Use on high traffic construction roads to
minimize dust and erosion.
Stabilized construction roadways are
used instead of rough-cut street controls
on roadways with frequent construction traffic.
Design and Installation
Stabilized construction roadways typically involve two key components: 1) stabilizing the road surface with an aggregate base course of 3-inch-diameter granular material and 2) stabilizing roadside ditches, if
applicable. Early application of road base is generally suitable where a layer of coarse aggregate is specified for final road construction.
Maintenance and Removal
Apply additional gravel as necessary to ensure roadway integrity.
Inspect drainage ditches along the roadway for erosion and stabilize, as needed, through the use of check
dams or rolled erosion control products.
Gravel may be removed once the road is ready to be paved. Prior to paving, the road should be inspected
for grade changes and damage. Regrade and repair as necessary.
Stabilized Construction Roadway
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material Management Yes
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SSA-1. Example of a staging area with a gravel surface to
prevent mud tracking and reduce runoff. Photo courtesy of Douglas County.
Description
A stabilized staging area is a clearly
designated area where construction equipment and vehicles, stockpiles, waste bins, and other construction-related
materials are stored. The contractor office trailer may also be located in this
area. Depending on the size of the
construction site, more than one staging area may be necessary.
Appropriate Uses
Most construction sites will require a
staging area, which should be clearly
designated in SWMP drawings. The layout of the staging area may vary depending on
the type of construction activity. Staging areas located in roadways due to space constraints require
special measures to avoid materials being washed into storm inlets.
Design and Installation
Stabilized staging areas should be completed prior to other construction activities beginning on the site. Major components of a stabilized staging area include:
Appropriate space to contain storage and provide for loading/unloading operations, as well as parking
if necessary.
A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.
Perimeter controls such as silt fence, sediment control logs, or other measures.
Construction fencing to prevent unauthorized access to construction materials.
Provisions for Good Housekeeping practices related to materials storage and disposal, as described in
the Good Housekeeping BMP Fact Sheet.
A stabilized construction entrance/exit, as described in the Vehicle Tracking Control BMP Fact Sheet, to accommodate traffic associated with material delivery and waste disposal vehicles.
Over-sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that required for the project. This increases costs, as well as requirements for long-term stabilization following the
construction period. When designing the stabilized staging area, minimize the area of disturbance to the extent practical.
Stabilized Staging Area
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Material
Yes
SM-6 Stabilized Staging Area (SSA)
SSA-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when
materials staging in roadways is required.
Maintenance and Removal
Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing perimeter controls, and following good housekeeping practices.
When construction is complete, debris, unused stockpiles and materials should be recycled or properly
disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface
cover planned for the development.
Minimizing Long-Term Stabilization Requirements
Utilize off-site parking and restrict vehicle access to the site.
Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed otherwise.
Consider use of a bermed contained area for materials and equipment that do not require a
stabilized surface.
Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise
disturbed.
Stabilized Staging Area (SSA) SM-6
November 2010 Urban Drainage and Flood Control District SSA-3
Urban Storm Drainage Criteria Manual Volume 3
SM-6 Stabilized Staging Area (SSA)
SSA-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Street Sweeping and Vacuuming (SS) SM-7
November 2010 Urban Drainage and Flood Control District SS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph SS-1. A street sweeper removes sediment and potential pollutants along the curb line at a construction site. Photo courtesy of Tom Gore.
Description
Street sweeping and vacuuming remove
sediment that has been tracked onto roadways to reduce sediment transport into storm drain systems or a surface
waterway.
Appropriate Uses
Use this practice at construction sites where vehicles may track sediment offsite onto paved roadways.
Design and Installation
Street sweeping or vacuuming should be
conducted when there is noticeable sediment accumulation on roadways adjacent to the construction site. Typically, this will be concentrated
at the entrance/exit to the construction site. Well-maintained stabilized construction entrances, vehicle
tracking controls and tire wash facilities can help reduce the necessary frequency of street sweeping and vacuuming.
On smaller construction sites, street sweeping can be conducted manually using a shovel and broom.
Never wash accumulated sediment on roadways into storm drains.
Maintenance and Removal
Inspect paved roads around the perimeter of the construction site on a daily basis and more frequently, as needed. Remove accumulated sediment, as needed.
Following street sweeping, check inlet protection that may have been displaced during street
sweeping.
Inspect area to be swept for materials that may be hazardous prior to beginning sweeping operations.
Street Sweeping/ Vacuuming
Functions
Erosion Control No
Sediment Control Yes
Site/Material Management Yes
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TDC-1. Use of a temporary diversion channel (right side)
to enable installation of a grade control structure (left side). Photo courtesy of WWE.
Description
A temporary diversion channel diverts
water from a stream to allow for construction activities to take place underneath or in the stream. Diversion
channels are often required during the construction of detention ponds, dams,
in-stream grade control structures,
utility installation and other activities that require working in waterways.
Appropriate Uses
Temporary diversion channels vary
with the size of the waterway that is
being diverted. For large streams, a temporary diversion may consist of
berms or coffer dams constructed in the
stream to confine flow to one side of the stream while work progresses on the dry side of the berm. For smaller streams and often for construction of dams and detention basins, a temporary diversion channel
may divert the entire waterway, as illustrated in Figure TDC-1. For very short duration projects (typically
less than 4 weeks) during dry periods with low base flows, a pump and bypass pipe may serve as a temporary diversion. Whenever a temporary diversion is used, construction should be scheduled during
drier times of the year if possible (October 1 through April 1), and construction in the waterway should progress as quickly as possible to reduce the risk of exceeding the temporary diversion channel capacity.
Some construction activities within a waterway are very short lived, namely a few hours or days in
duration, and are minor in nature. These are typically associated with maintenance of utilities and stream crossings and minor repairs to outfalls and eroded banks. In these cases, construction of temporary diversion channels can often cause more soil disturbance and sediment movement than the maintenance
activity itself. If it can be reasonably determined based on area and duration of disturbance that channel work will result in less disturbance and movement of sediment than would be done through installation of a temporary diversion channel, it is reasonable to exempt these activities from the requirement to
construct a temporary diversion.
Design and Installation
Temporary Diversion Channel sizing procedures typically include the following steps:
Using the tributary area, A (in acres), determine the design peak flow rate according to Figure TDC-2. Note: For long duration projects, or where the consequences of diversion failure warrant, a larger
design flow may be necessary.
Determine depth of flow, 1-foot maximum for flows
less than 20 cfs and 3 feet maximum for flows less
than 100 cfs. (Flows in excess of 100 cfs should be designed in accordance with the Major Drainage
chapter in Volume 1).
Temporary Diversion Channel
Functions
Erosion Control Yes
Sediment Control No
Site/Material Management No
SM-8 Temporary Diversion Channel (TDC)
TDC-2 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
Determine channel slope based on existing and proposed site conditions.
Perform initial channel sizing calculations using Manning's Equation. Determine maximum
permissible velocities based on lining material.
Determine the channel geometry and check the capacity using Manning's Equation and the "n" value given in Table TDC-1. The steepest side slope allowable for a temporary channel is two horizontal to
one vertical (2:1), unless vertical walls are installed using sheet piling, concrete or stacked stone.
Temporary diversion channels should have a minimum freeboard of 0.5 feet above the design water surface elevation.
Figure TDC-2 may be used to estimate the design discharge for the sizing of temporary diversion
channels and pipes. The curves in this figure were developed using annual peak flow data collected from 17 watersheds within the UDFCD boundary. These data were collected over extended periods of time (up
to eleven years) and, as a result, provide a sound statistical basis for the figure. The data supporting
Figure TDC-2 were taken during the high flood potential period of April through September. The values from Figure TDC-2 represent approximately the 95th percentile event that can occur, on the average, any
given year, which means that it is likely that about 95 percent of runoff peaks during an average year will be less than values from this chart. This may not be the case in wetter-than-average seasons. Figure TDC-2 provides estimated 2-year peak flow rates based on watershed imperviousness for small
waterways (< 12 square miles). Because Figure TDC-2 was developed using data from small watersheds, it is not appropriate to extrapolate from this figure for larger, more complex watersheds. For larger
waterways (e.g., South Platte River, Sand Creek, Bear Creek, etc.), including ones controlled by flood
control reservoirs (e.g. Chatfield Dam, Cherry Creek Dam, etc.), site specific risk assessment may be necessary to evaluate the appropriate level of protection to be provided by the temporary diversion. It is also important to recognize that larger floods can and do occur. It is the responsibility of the designer and
the contractor to assess their risk of having the temporary diversion being exceeded and to evaluate the damages such an event may cause to the project, adjacent properties and others. Consider larger capacity
diversions to protect a project if it will require a temporary diversion for more than one year.
Because temporary diversion channels typically are not in service long enough to establish adequate vegetative lining, they must be designed to be stable for the design flow with the channel shear stress less
than the critical tractive shear stress for the channel lining material. This stability criterion applies not only to diversion channels, but also to the stream-side of berms when berms are used to isolate a work area within a stream. Unlined channels should not be used. Table TDC-1 gives Manning's "n" values for
lining materials. Design procedures for temporary channels are described in detail in the Hydraulic Engineering Circular No. 15 published by the Federal Highway Administration. The methods presented in this Fact Sheet are greatly simplified and are based on information developed using the most
commonly used erosion control materials.
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-3
Urban Storm Drainage Criteria Manual Volume 3
Figure TDC-1. Typical Temporary Diversion Channel
Former Location of
Stream Bank
Former Location of Stream Bank
SM-8 Temporary Diversion Channel (TDC)
TDC-4 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
52.4%
40.2%
46.5%43.3%
33.3%
15.5%
18.0%
55.4%
24.3%
46.1%
39.1%
10.1%
60.9%
26.8%
29.8%
0
100
200
300
400
500
600
700
800
900
1000
0 2 4 6 8 10 12
TRIBUTARY AREA (SQUARE MILES)
FL
O
W
(
C
F
S
)
Imp. = 40%
Imp. = 30%
Imp. = 20%
Imp. = 60%
Figure TDC-2. Temporary Diversion Facility Sizing Nomograph Based on 2-year Peak Flows - Denver Metropolitan and Adjacent Areas
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-5
Urban Storm Drainage Criteria Manual Volume 3
Table TDC-1. Temporary Diversion Channel Design Criteria
Lining Material
Manning's n for
Flow Depth
0 ft to 1.0 ft
Manning's n for
Flow Depth
1.0 ft to 3.0 ft
Manning's n for
Flow Depth
3.0 ft to 5.0 ft
Plastic Membrane 0.011 0.010 0.009
Straw or Curled Wood Mats 0.035 0.025 0.020
Riprap, Type VL 0.070 0.045 0.035
Riprap, Type L 0.100 0.070 0.040
Riprap, Type M 0.125 0.075 0.045
Notes: Use manufacturer's Manning's n when available.
See the Major Drainage chapter of Volume 1 for riprap gradation.
Erosion protection should extend a minimum of 0.5 feet above the design water depth.
Maintenance and Removal
Because temporary diversion channels are one of the most critical BMPs for work in waterways, they must be inspected and maintained frequently to remain in effective operating condition. Flow barriers
should be inspected at the start and end of each workday and at any time that excess water is noted in dry work areas. The diversion channel itself should be inspected for signs of erosion, and the lining should be
repaired or replaced if there are signs of failure. Check armoring at the diversion return point to the
waterway, and add additional armoring if erosion is noted.
Water should not be allowed to flow back through the natural stream until all construction is completed.
After redirecting the flow through the natural channel, lining materials should be removed from the
temporary diversion channel. The diversion channel should then be backfilled and stabilized. Points of tie-in to the natural channel should be protected with riprap sized in accordance with the Major Drainage
chapter in Volume 1.
SM-8 Temporary Diversion Channel (TDC)
TDC-6 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
Temporary Diversion Channel (TDC) SM-8
August 2011 Urban Drainage and Flood Control District TDC-7
Urban Storm Drainage Criteria Manual Volume 3
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph DW-1. A relatively small dewatering operation using straw bales and a dewatering bag.
Photograph DW-2. Dewatering bags used for a relatively large dewatering operation.
Description
The BMPs selected for construction
dewatering vary depending on site-specific features such as soils, topography, anticipated discharge
quantities, and discharge location. Dewatering typically involves pumping
water from an inundated area to a BMP,
and then downstream to a receiving waterway, sediment basin, or well-
vegetated area. Dewatering typically
involves use of several BMPs in sequence.
Appropriate Uses
Dewatering operations are used when an
area of the construction site needs to be
dewatered as the result of a large storm event, groundwater, or existing ponding
conditions. This can occur during deep
excavation, utility trenching, and wetland or pond excavation.
Design and Installation
Dewatering techniques will vary
depending on site conditions. However,
all dewatering discharges must be treated to remove sediment before discharging
from the construction site. Discharging water into a sediment trap or basin is an acceptable treatment option. Water may
also be treated using a dewatering filter bag, and a series of straw bales or sediment logs. If these previous options are not feasible due to space or the ability to passively treat the discharge to remove sediment, then a settling tank or an active treatment
system may need to be utilized. Settling tanks are manufactured tanks with a series of baffles to promote settling. Flocculants can also be added to the tank to induce more rapid settling. This is an approach sometimes used on highly urbanized construction sites. Contact the state agency for special requirements
prior to using flocculents and land application techniques.
Some commonly used methods to handle the pumped
water without surface discharge include land application
to vegetated areas through a perforated discharge hose (i.e., the "sprinkler method") or dispersal from a water
truck for dust control.
Dewatering Operations
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Management Yes
SM-9 Dewatering Operations (DW)
DW-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Dewatering discharges to non-paved areas must minimize the potential for scour at the discharge point either using a velocity dissipation device or dewatering filter bag.
Design Details are provided for these types of dewatering situations:
DW-1. Dewatering for Pond Already Filled with Water
DW-2 Dewatering Sump for Submersed Pump
DW-3 Sump Discharge Settling Basin
DW-4 Dewatering Filter Bag
Maintenance and Removal
When a sediment basin or trap is used to enable settling of sediment from construction dewatering discharges, inspect the basin for sediment accumulation. Remove sediment prior to the basin or trap
reaching half full. Inspect treatment facilities prior to any dewatering activity. If using a sediment
control practice such as a sediment trap or basin, complete all maintenance requirements as described in the fact sheets prior to dewatering.
Properly dispose of used dewatering bags, as well as sediment removed from the dewatering BMPs.
Depending on the size of the dewatering operation, it may also be necessary to revegetate or otherwise stabilize the area where the dewatering operation was occurring.
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-3
Urban Storm Drainage Criteria Manual Volume 3
SM-9 Dewatering Operations (DW)
DW-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Dewatering Operations (DW) SM-9
November 2010 Urban Drainage and Flood Control District DW-5
Urban Storm Drainage Criteria Manual Volume 3
Temporary Stream Crossing (TSC) SM-10
November 2010 Urban Drainage and Flood Control District TSC-1
Urban Storm Drainage Criteria Manual Volume 3
Description
Where an actively flowing watercourse
must be crossed regularly by construction vehicles, a temporary crossing should be provided. Three
primary methods are available:
Culvert crossing
Stream ford
Temporary bridge
Culvert crossings and fords are the most
commonly used methods. Due to the
expense associated with a temporary bridge, these are used primarily on long-
term projects.
Appropriate Uses
Construction vehicles shall be kept out of waterways to the maximum extent practicable. Use a
temporary stream crossing when it is absolutely necessary to cross a stream on a construction site. Construct a temporary crossing even if the stream or drainageway is typically dry. Multiple stream
crossings should be avoided to minimize environmental impacts.
A permit is required for placement of fill in a waterway under Section 404 of the Clean Water Act. The local office of the U.S. Army Corps of Engineers (USACE) should be contacted concerning the
requirements for obtaining a 404 permit. In addition, a permit from the U.S. Fish and Wildlife Service
(USFWS) may be needed if endangered species are of concern in the work area. Typically, the USFWS issues are addressed by a 404 permit, if one is required. The municipality of jurisdiction should also be
consulted, and can provide assistance. Other permits to be obtained may include a floodplain development permit from the local jurisdiction.
Design and Installation
Design details are provided for these types of stream crossings:
TSC-1. Culvert Crossing
TSC-2. Ford Crossing
TSC-3. Flume Crossing
Temporary Stream Crossing
Functions
Erosion Control Yes
Sediment Control Yes
Site/Material Management No
Photograph TSC-1. A temporary stream crossing using culverts. Photo courtesy of Tom Gore.
SM-10 Temporary Stream Crossing (TSC)
TSC-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
A culvert crossing should be designed to pass at least the 2-year design flow. Use Figure DC-2 from the Temporary Channel Diversion Fact Sheet to determine the 2-year peak flow rate. Culvert sizing must
account for the headwater and tailwater controls to properly size the culvert. For additional discussion on
design of box culverts and pipes, see the Major Drainage chapter in Volume 1. The designer also needs to confirm that the riprap selected is appropriate for the conditions in the channel being crossed.
When a ford must be used, namely when a culvert is not practical or the best solution, the ford should be
lined with at least a 12-inch thick layer of Type VL (D50 = 6 inches) or Type L (D50 = 9 inches) riprap with void spaces filed with 1-1/2 inch diameter rock. Ford crossings are recommended primarily for
crossings of ephemeral (i.e. intermittently, briefly flowing) streams.
For a temporary bridge crossing, consult with a structural and/or geotechnical engineer for temporary bridge design or consider pre-fabricated alternatives.
Maintenance and Removal
Inspect stream for bank erosion and in-stream degradation. If bank erosion is occurring, stabilize banks
using erosion control practices such as erosion control blankets. If in-stream degradation is occurring,
armor the culvert outlet(s) with riprap to dissipate energy (see Outlet Protection Fact Sheet). If sediment is accumulating upstream of the crossing, remove excess sediment as needed to maintain the functionality
of the crossing.
Remove the temporary crossing when it is no longer needed for construction. Take care to minimize the amount of sediment lost into the stream upon removal. Once the crossing has been removed, stabilize the
stream banks with seed and erosion control blankets.
Temporary Stream Crossing (TSC) SM-10
November 2010 Urban Drainage and Flood Control District TSC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-10 Temporary Stream Crossing (TSC)
TSC-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Stream Crossing (TSC) SM-10
November 2010 Urban Drainage and Flood Control District TSC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-10 Temporary Stream Crossing (TSC)
TSC-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary Batch Plant (TBP) SM-11
November 2010 Urban Drainage and Flood Control District TBP-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph TBP-1. Effective stormwater management at temporary batch plants requires implementation of multiple BMPs. Photo courtesy of California Stormwater BMP Handbook.
Description
Temporary batch plant management
includes implementing multiple BMPs such as perimeter controls, concrete washout area, stabilized construction
access, good housekeeping, and other practices designed to reduce polluted
runoff from the batch plant area.
Appropriate Uses
Implement this BMP at temporary batch
plants and identify the location of the batch plant in the SWMP.
Additional permitting may be required for
the operation of batch plants depending on their duration and location.
Design and Installation
The following lists temporary management strategies to mitigate runoff from batch plant operations:
When stockpiling materials, follow the Stockpile Management BMP.
Locate batch plants away from storm drains and natural surface waters.
A perimeter control should be installed around the temporary batch plant.
Install run-on controls where feasible.
A designated concrete washout should be located within the perimeter of the site following the
procedures in the Concrete Washout Area BMP.
Follow the Good Housekeeping BMP, including proper spill containment measures, materials
storage, and waste storage practices.
A stabilized construction entrance or vehicle tracking control pad should be installed at the plant entrance, in accordance with the Vehicle Tracking Control BMP.
Maintenance and Removal
Inspect the batch plant for proper functioning of the BMPs, with
attention to material and waste storage areas, integrity of perimeter BMPs, and an effective stabilized construction entrance.
Temporary Batch Plants
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
SM-11 Temporary Batch Plant (TBP)
TBP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
After the temporary batch plant is no longer needed, remove stockpiled materials and equipment, regrade the site as needed, and revegetate or otherwise stabilize the area.
Paving and Grinding Operations (PGO) SM-12
November 2010 Urban Drainage and Flood Control District PGO-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph PGO-1. Paving operations on a Colorado highway. Photo courtesy of CDOT.
Description
Manage runoff from paving and grinding
operations to reduce pollutants entering storm drainage systems and natural drainageways.
Appropriate Uses
Use runoff management practices during
all paving and grinding operations such as surfacing, resurfacing, and saw cutting.
Design and Installation
There are a variety of management
strategies that can be used to manage runoff from paving and grinding operations:
Establish inlet protection for all inlets that could potentially receive runoff.
Schedule paving operations when dry weather is forecasted.
Keep spill kits onsite for equipment spills and keep drip pans onsite for stored equipment.
Install perimeter controls when asphalt material is used on embankments or shoulders near
waterways, drainages, or inlets.
Do not wash any paved surface into receiving storm drain inlets or natural drainageways. Instead, loose material should be swept or vacuumed following paving and grinding operations.
Store materials away from drainages or waterways.
Recycle asphalt and pavement material when feasible. Material that cannot be recycled must be disposed of in accordance with applicable regulations.
See BMP Fact Sheets for Inlet Protection, Silt Fence and other perimeter controls selected for use during
paving and grinding operations.
Maintenance and Removal
Perform maintenance and removal of inlet protection and perimeter controls in accordance with their respective fact sheets.
Promptly respond to spills in accordance with the spill prevention and control plan.
Paving and Grinding Operations
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph GB-1. A flush curb allows roadway runoff to sheet flow through the grass buffer. Flows are then further treated by the grass swale. Photo courtesy of Muller Engineering.
Description
Grass buffers are densely vegetated strips of grass designed to accept sheet
flow from upgradient development. Properly designed grass buffers play a
key role in LID, enabling infiltration and
slowing runoff. Grass buffers provide filtration (straining) of sediment.
Buffers differ from swales in that they
are designed to accommodate overland sheet flow rather than concentrated or
channelized flow.
Site Selection
Grass buffers can be incorporated into a
wide range of development settings. Runoff can be directly accepted from a
parking lot, roadway, or the roof of a
structure, provided the flow is distributed in a uniform manner over the width of the buffer. This can be achieved through the use of flush curbs, slotted curbs, or level spreaders where needed. Grass buffers are
often used in conjunction with grass swales. They are well suited for use in riparian zones to assist in stabilizing channel banks adjacent to major drainageways and receiving waters. These areas can also sometimes serve multiple functions such as recreation.
Hydrologic Soil Groups A and B provide the best infiltration capacity for grass buffers. For Type C and D soils, buffers still serve to provide filtration (straining) although infiltration rates are
lower.
Designing for Maintenance
Recommended ongoing maintenance practices for all BMPs are provided in Chapter 6 of this manual. During design the following should be considered to ensure ease of maintenance
over the long-term:
Where appropriate (where vehicle safety would not be
impacted), install the top of the buffer 1 to 3 inches below the
adjacent pavement so that growth of vegetation and accumulation of sediment at the edge of the strip does not
prevent runoff from entering the buffer. Alternatively, a
sloped edge can be used adjacent to vehicular traffic areas.
Amend soils to encourage deep roots and reduce irrigation
requirements, as well as promote infiltration.
Grass Buffer
Functions
LID/Volume Red. Yes
WQCV Capture No
WQCV+Flood Control No
Fact Sheet Includes EURV Guidance No
Typical Effectiveness for Targeted
Pollutants3
Sediment/Solids Good
Nutrients Moderate
Total Metals Good
Bacteria Poor
Other Considerations
Life-cycle Costs Low
3 Based primarily on data from the International Stormwater BMP Database (www.bmpdatabase.org).
T-1 Grass Buffer
GB-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Benefits
Filters (strains) sediment and trash.
Reduces directly connected
impervious area. (See Chapter 3 for quantifying benefits.)
Can easily be incorporated into a treatment train approach.
Provides green space available
for multiple uses including recreation and snow storage.
Straightforward maintenance
requirements when the buffer is protected from vehicular traffic.
Limitations
Frequently damaged by vehicles when adjacent to roadways and
unprotected.
A thick vegetative cover is
needed for grass buffers to be
effective.
Nutrient removal in grass buffers
is typically low.
High loadings of coarse solids, trash, and debris require
pretreatment.
Space for grass buffers may not be available in ultra urban areas
(lot-line-to-lot-line).
Design and adjust the irrigation system (temporary or
permanent) to provide water in amounts appropriate for the selected vegetation. Irrigation needs will change from
month to month and year to year.
Protect the grass buffer from vehicular traffic when using this BMP adjacent to roadways. This can be done with a
slotted curb (or other type of barrier) or by constructing a reinforced grass shoulder (see Fact Sheet T-10.5).
Design Procedure and Criteria
The following steps outline the grass buffer design procedure and criteria. Figure GB-1 is a schematic of the facility and its
components:
1. Design Discharge: Use the hydrologic procedures described in the Runoff chapter of Volume 1 to determine
the 2-year peak flow rate (Q2) of the area draining to the grass buffer.
2. Minimum Width: The width (W), normal to flow of the
buffer, is typically the same as the contributing basin (see Figure GB-1). An exception to this is where flows become
concentrated. Concentrated flows require a level spreader
to distribute flows evenly across the width of the buffer. The minimum width should be: 𝑊𝑊=𝑄𝑄20.05 Equation GB-1
Where:
W = width of buffer (ft)
Q2 = 2-year peak runoff (cfs)
3. Length: The recommended length (L), the distance along the sheet flow direction, should be a minimum of 14 feet. This value is based on the findings of Barrett et al. 2004 in Stormwater Pollutant Removal in Roadside Vegetated Strips and is appropriate for buffers with greater than 80%
vegetative cover and slopes up to 10%. The study found
that pollutant removal continues throughout a length of 14 feet. Beyond this length, a point of diminishing returns in pollutant reduction was found. It is important to note that shorter lengths or
slightly steeper slopes will also provide some level of removal where site constraints dictate the
geometry of the buffer.
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-3
Urban Storm Drainage Criteria Manual Volume 3
Photograph GB-2. This level spreader carries concentrated flows into a slotted pipe encased in concrete to distribute flows evenly to the grass buffer
shown left in the photo. Photo courtesy of Bill Wenk.
Use of Grass Buffers
Sheet flow of stormwater through a grassed area provides some benefit in pollutant removal and volume
reduction even when the geometry of the BMP does not meet the criteria
provided in this Fact Sheet. These
criteria provide a design procedure that should be used when possible; however, when site constraints are
limiting, this treatment concept is still encouraged.
4. Buffer Slope: The design slope of a grass buffer in the
direction of flow should not exceed 10%. Generally, a minimum slope of 2% or more in turf is adequate to
facilitate positive drainage. For slopes less than 2%,
consider including an underdrain system to mitigate nuisance drainage.
5. Flow Characteristics (sheet or concentrated):
Concentrated flows can occur when the width of the watershed differs from that of the grass buffer.
Additionally, when the product of the watershed flow length and the interface slope (the slope of the watershed normal to flow at the grass buffer) exceeds approximately
one, flows may become concentrated. Use the following equations to determine flow characteristics: Sheet Flow: FL(SI) ≤ 1 Equation GB-2 Concentrated Flow: FL(SI) > 1 Equation GB-3
Where:
FL = watershed flow length (ft)
SI = interface slope (normal to flow) (ft/ft)
6. Flow Distribution: Flows delivered to a grass buffer must be sheet flows. Slotted or flush curbing, permeable pavements, or other devices can be used to spread flows. The grass buffer should have
relatively consistent slopes to avoid concentrating flows within the buffer.
A level spreader should be used when flows are concentrated. A level spreader can be a slotted drain designed to discharge flow through the slot as shown in Photo GB-2. It could be an exfiltration
trench filled with gravel, which allows water to infiltrate prior to discharging over a level concrete or
rock curb. There are many ways to design and construct a level spreader. They can also be used in series when the length of the
buffer allows flows to re-
concentrate. See Figure GB-2 for various level spreader sections.
T-1 Grass Buffer
GB-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Photograph GB-3. This level spreader includes the added benefit of a sedimentation basin prior to even distribution of concentrated flows from the roadway into the grass buffer. Photo courtesy of Bill Wenk.
Photograph GB-4. Maintenance access is provided via the ramp located at the end of the basin. Photo courtesy of Bill Wenk.
Photos GB-3 and GB-4 show a level
spreader that includes a basin for sedimentation. Concentrated flows
enter the basin via stormsewer. The
basin is designed to drain slowly while overflow is spread evenly to
the downstream vegetation. A small notch, orifice, or pipe can be used to drain the level spreader completely.
The opening should be small to encourage frequent flows to overtop the level spreader but not so small
that it is frequently clogged.
7. Soil Preparation: In order to
encourage establishment and long-
term health of the selected vegetation, it is essential that soil conditions be
properly prepared prior to
installation. Following site grading, poor soil conditions often exist.
When possible, remove, strip,
stockpile, and reuse on-site topsoil. If the site does not contain topsoil,
the soils should be amended prior to
vegetation. Typically 3 to 5 cubic yards of soil amendment (compost)
per 1,000 square feet, tilled 6 inches into the soil is required in order for vegetation to thrive, as well as to
enable infiltration of runoff. Additionally, inexpensive soil tests
can be conducted to determine
required soil amendments. (Some local governments may also require
proof of soil amendment in
landscaped areas for water conservation reasons.)
8. Vegetation: This is the most critical
component for treatment within a grass buffer. Select durable, dense, and drought tolerant grasses to vegetate the buffer. Also consider the size of the watershed as larger watersheds will experience
more frequent flows. The goal is to provide a dense mat of vegetative cover. Grass buffer performance falls off rapidly as the vegetation coverage declines below 80% (Barrett et al.2004).
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-5
Urban Storm Drainage Criteria Manual Volume 3
Turf grasses such as Kentucky bluegrass are often selected due to these qualities1
9. Irrigation: Grass buffers should be equipped with irrigation systems to promote establishment and
survival in Colorado's semi-arid environment. Systems may be temporary or permanent, depending
on the type of vegetation selected. Irrigation application rates and schedules should be developed and adjusted throughout the establishment and growing season to meet the needs of the selected plant
species. Initially, native grasses require the same irrigation requirements as bluegrass. After the grass is established, irrigation requirements for native grasses can be reduced. Irrigation practices have a significant effect on the function of the grass buffer. Overwatering decreases the permeability
of the soil, reducing the infiltration capacity and contributing to nuisance baseflows. Conversely, under watering may result in delays in establishment of the vegetation in the short term and unhealthy
vegetation that provides less filtering and increased susceptibility to erosion and rilling over the long
term.
. Dense native turf
grasses may also be selected where a more natural look is desirable. Once established, these provide the benefit of lower irrigation requirements. See the Revegetation chapter in Volume 2 of this manual
with regard to seed mix selection, planting and ground preparation. Depending on soils and
anticipated flows, consider erosion control measures until vegetation has been established.
10. Outflow Collection: Provide a means for downstream conveyance. A grass swale can be used for
this purpose, providing additional LID benefits.
Construction Considerations
Success of grass buffers depends not only on a good design and long-term maintenance, but also on
installing the facility in a manner that enables the BMP to function as designed. Construction considerations include:
The final grade of the buffer is critical. Oftentimes, following soil amendment and placement of sod,
the final grade is too high to accept sheet flow. The buffer should be inspected prior to placement of seed or sod to ensure appropriate grading.
Perform soil amending, fine grading, and seeding only after tributary areas have been stabilized and
utility work crossing the buffer has been completed.
When using sod tiles stagger the ends of the tiles to prevent the formation of channels along the
joints. Use a roller on the sod to ensure there are no air pockets between the sod and soil.
Avoid over compaction of soils in the buffer area during construction to preserve infiltration capacities.
Erosion and sediment control measures on upgradient disturbed areas must be maintained to prevent
excessive sediment loading to grass buffer.
1 Although Kentucky bluegrass has relatively high irrigation requirements to maintain a lush, green aesthetic, it also withstands drought conditions by going dormant. Over-irrigation of Kentucky bluegrass is a common problem along the Colorado Front
Range, and it can be healthy, although less lush, with much less irrigation than is typically applied.
T-1 Grass Buffer
GB-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
PLAN
PROFILE
Figure GB-1. Typical Grass Buffer Graphic by Adia Davis.
Grass Buffer T-1
November 2010 Urban Drainage and Flood Control District GB-7
Urban Storm Drainage Criteria Manual Volume 3
Figure GB-2. Typical Level Spreader Details
Grass Swale T-2
November 2010 Urban Drainage and Flood Control District GS-1
Urban Storm Drainage Criteria Manual Volume 3
Photograph GS-1. This grass swale provides treatment of roadway runoff in a residential area. Photo courtesy of Bill Ruzzo.
Description
Grass swales are densely vegetated
trapezoidal or triangular channels with low-pitched side slopes designed to convey runoff slowly. Grass swales
have low longitudinal slopes and broad cross-sections that convey flow in a slow
and shallow manner, thereby facilitating
sedimentation and filtering (straining) while limiting erosion. Berms or check
dams may be incorporated into grass
swales to reduce velocities and encourage settling and infiltration.
When using berms, an underdrain
system should be provided. Grass swales are an integral part of the Low
Impact Development (LID) concept and may be used as an alternative to a curb and gutter system.
Site Selection
Grass swales are well suited for sites with low to moderate slopes.
Drop structures or other features designed to provide the same function as a drop structures (e.g., a driveway with a stabilized grade differential at the downstream end) can be integrated into
the design to enable use of this BMP at a broader range of site conditions. Grass swales provide conveyance so they can also be used to replace curb and gutter systems making them well suited
for roadway projects.
Designing for Maintenance
Recommended ongoing maintenance practices for all BMPs are provided in Chapter 6 of this manual. During design, the following should be considered to ensure ease of maintenance
over the long-term:
Consider the use and function of other site features so that the
swale fits into the landscape in a natural way. This can
encourage upkeep of the area, which is particularly important in residential areas where a loss of aesthetics and/or function
can lead to homeowners filling in and/or piping reaches of
this BMP.
Grass Swale
Functions
LID/Volume Red. Yes
WQCV Capture No
WQCV+Flood Control No
Fact Sheet Includes EURV Guidance No
Typical Effectiveness for Targeted
Pollutants3
Sediment/Solids Good
Nutrients Moderate
Total Metals Good
Bacteria Poor
Other Considerations
Life-cycle Costs Low
3 Based primarily on data from the International Stormwater BMP Database (www.bmpdatabase.org).
T-2 Grass Swale
GS-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Provide access to the swale for mowing equipment and design sideslopes flat enough for the safe operation of
equipment.
Design and adjust the irrigation system (temporary or permanent) to provide appropriate water for the selected
vegetation.
An underdrain system will reduce excessively wet areas, which can cause rutting and damage to the vegetation
during mowing operations.
When using an underdrain, do not put a filter sock on the pipe. This is unnecessary and can cause the slots or
perforations in the pipe to clog.
Design Procedure and Criteria
The following steps outline the design procedure and criteria
for stormwater treatment in a grass swale. Figure GS-1 shows trapezoidal and triangular swale configurations.
1. Design Discharge: Determine the 2-year flow rate to be conveyed in the grass swale under fully developed conditions. Use the hydrologic procedures described in
the Runoff Chapter in Volume 1.
2. Hydraulic Residence Time: Increased hydraulic residence time in a grass swale improves water quality
treatment. Maximize the length of the swale when possible. If the length of the swale is limited due to site
constraints, the slope can also be decreased or the cross-sectional area increased to increase hydraulic
residence time.
3. Longitudinal Slope: Establish a longitudinal slope that will meet Froude number, velocity, and
depth criteria while ensuring that the grass swale maintains positive drainage. Positive drainage can
be achieved with a minimum 2% longitudinal slope or by including an underdrain system (see step 8). Use drop structures as needed to accommodate site constraints. Provide for energy dissipation
downstream of each drop when using drop structures.
4. Swale Geometry: Select geometry for the grass swale. The cross section should be either trapezoidal or triangular with side slopes not exceeding 4:1 (horizontal: vertical), preferably flatter.
Increase the wetted area of the swale to reduce velocity. Lower velocities result in improved pollutant removal efficiency and greater volume reduction. If one or both sides of the grass swale are also to be used as a grass buffer, follow grass buffer criteria.
Benefits
Removal of sediment and
associated constituents through
filtering (straining)
Reduces length of storm sewer
systems in the upper portions of a
watershed
Provides a less expensive and
more attractive conveyance
element
Reduces directly connected
impervious area and can help reduce runoff volumes.
Limitations
Requires more area than traditional storm sewers.
Underdrains are recommended for slopes under 2%.
Erosion problems may occur if not
designed and constructed
properly.
Grass Swale T-2
November 2010 Urban Drainage and Flood Control District GS-3
Urban Storm Drainage Criteria Manual Volume 3
Native grasses provide
a more natural aesthetic
and require less water
once established.
Use of Grass Swales
Vegetated conveyance elements provide some benefit in pollutant removal and volume reduction
even when the geometry of the BMP does not meet the criteria provided in this Fact Sheet. These criteria provide a design procedure that should be used when possible; however, when site
constraints are limiting, vegetated conveyance elements designed for stability are still encouraged.
5. Vegetation: Select durable, dense, and drought tolerant grasses. Turf grasses, such as Kentucky bluegrass, are often selected due to these qualities1
once established. Turf grass is a general term for any grasses that will form a turf or mat as opposed to bunch
grass, which will grow in clumplike fashion. Grass
selection should consider both short-term (for establishment) and long-term maintenance requirements,
given that some varieties have higher maintenance
requirements than others. Follow criteria in the Revegetation Chapter of Volume 2, with regard to seed
mix selection, planting, and ground preparation.
. Native turf grasses may also be selected where a
more natural look is desirable. This will also provide the benefit of lower irrigation requirements,
6. Design Velocity: Maximum flow velocity in the swale should not exceed one foot per second. Use the Soil
Conservation Service (now the NRCS) vegetal retardance curves for the Manning coefficient (Chow 1959). Determining the retardance coefficient is an iterative
process that the UD-BMP workbook automates. When starting the swale vegetation from sod, curve "D" (low retardance) should be used. When starting
vegetation from seed, use the "E" curve (very low vegetal retardance).
7. Design Flow Depth: Maximum flow depth should not exceed one foot at the 2-year peak flow rate. Check the conditions for the 100-year flow to ensure that drainage is being handled without flooding
critical areas, structures, or adjacent streets.
Table GS-1. Grass Swale Design Summary for Water Quality
1 Although Kentucky bluegrass has relatively high irrigation requirements to maintain a lush, green aesthetic, it also withstands drought conditions by going dormant. Over-irrigation of Kentucky bluegrass is a common problem along the Colorado Front Range. It can be healthy, although less lush, with much less irrigation than is typically applied.
Design Flow Maximum Froude Number Maximum Velocity Maximum Flow Depth
2-year event 0.5 1 ft/s 1 ft
T-2 Grass Swale
GS-4 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
8. Underdrain: An underdrain is necessary for swales with longitudinal slopes less than 2.0%. The
underdrain can drain directly into an inlet box at the downstream end of the swale, daylight through
the face of a grade control structure or continue below grade through several grade control structures as shown in Figure GS-1.
The underdrain system should be placed within an aggregate layer. If no underdrain is required, this
layer is not required. The aggregate layer should consist of an 8-inch thick layer of CDOT Class C filter material meeting the gradation in Table GS-2. Use of CDOT Class C Filter material with a
slotted pipe that meets the slot dimensions provided in Table GS-3 will eliminate the need for
geotextile fabrics. Previous versions of this manual detailed an underdrain system that consisted of a 3- to 4-inch perforated HDPE pipe in a one-foot trench section of AASHTO #67 coarse aggregate
surrounded by geotextile fabric. If desired, this system continues to provide an acceptable alternative for use in grass swales. Selection of the pipe size may be a function of capacity or of maintenance equipment. Provide cleanouts at approximately 150 feet on center.
Table GS-2. Gradation Specifications for Class C Filter Material (Source: CDOT Table 703-7)
Sieve Size Mass Percent Passing Square Mesh Sieves
19.0 mm (3/4") 100
4.75 mm (No. 4) 60 – 100
300 µm (No. 50) 10 – 30
150 µm (No. 100) 0 – 10
75 µm (No. 200) 0 - 3
Table GS-3. Dimensions for Slotted Pipe
Pipe Diameter Slot
Length1
Maximum Slot
Width
Slot
Centers1 Open Area1 (per foot)
4” 1-1/16” 0.032” 0.413” 1.90 in2
6” 1-3/8” 0.032” 0.516” 1.98 in2
1 Some variation in these values is acceptable and is expected from various pipe
manufacturers. Be aware that both increased slot length and decreased slot centers
will be beneficial to hydraulics but detrimental to the structure of the pipe.
Grass Swale T-2
November 2010 Urban Drainage and Flood Control District GS-5
Urban Storm Drainage Criteria Manual Volume 3
Photograph GS-2. This community used signage to mitigate compaction of soils post-
construction. Photo courtesy of Nancy Styles.
9. Soil preparation: Poor soil conditions often exist following site grading. When the section includes an underdrain, provide 4 inches of sandy loam at the invert of the swale extending up to the 2-year
water surface elevation. This will improve infiltration and reduce ponding. For all sections,
encourage establishment and long-term health of the bottom and side slope vegetation by properly preparing the soil. If the existing site provides a good layer of topsoil, this should be striped,
stockpiled, and then replaced just prior to seeding or placing sod. If not available at the site, topsoil
can be imported or the existing soil may be amended. Inexpensive soil tests can be performed following rough grading, to determine required soil amendments. Typically, 3 to 5 cubic yards of soil
amendment per 1,000 square feet, tilled 4 to 6 inches into the soil is required in order for vegetation to
thrive, as well as to enable infiltration of runoff.
10. Irrigation: Grass swales should be equipped with irrigation systems to promote establishment and
survival in Colorado's semi-arid environment. Systems may be temporary or permanent, depending
on the type of grass selected. Irrigation practices have a significant effect on the function of the grass swale. Overwatering decreases the permeability of the soil, reducing the infiltration capacity of the
soil and contributing to nuisance baseflows. Conversely, under watering may result in delays in establishment of the vegetation in the short term and unhealthy vegetation that provides less filtering (straining) and increased susceptibility to erosion and riling over the long term.
Construction Considerations
Success of grass swales depends not only on a good
design and maintenance, but also on construction practices that enable the BMP to function as designed. Construction considerations include:
Perform fine grading, soil amendment, and seeding only after upgradient surfaces have been stabilized
and utility work crossing the swale has been
completed.
Avoid compaction of soils to preserve infiltration
capacities.
Provide irrigation appropriate to the grass type.
Weed the area during the establishment of vegetation
by hand or mowing. Mechanical weed control is
preferred over chemical weed killer.
Protect the swale from other construction activities.
When using an underdrain, ensure no filter sock is placed on the pipe. This is unnecessary and can cause the slots or perforations in the pipe to clog.
T-2 Grass Swale
GS-6 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Figure GS-1. Grass Swale Profile and Sections
Design Example
The UD-BMP workbook, designed as a tool for both designer and reviewing agency is available at
www.udfcd.org. This section provides a completed design form from this workbook as an example.
`
EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX C
LANDSCAPE PLAN
`
EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX D
PERMITS / APPLICATIONS
`
EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX E
INSPECTION LOGS
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
1
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
2
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
3
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
4
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
5
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
6
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
7
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
8
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
9
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
10
STORM WATER MANAGEMENT PLAN
INSPECTION TABLE
Engines Energy Conversions Lab
BMP Name/ Desc.Date Erosion Control Measures Effective Brief Revision Description
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
___ Yes ____ No ____ Yes (w/Rev)
11
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EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX F
CONTRACTOR INSERTS
`
EPSGROUPINC.COM | 970.221.4158
Fort Collins | Greeley | Mesa | Tucson | Goodyear | Phoenix | Fort Worth
APPENDIX G
CONTRACTOR INSERTS