HomeMy WebLinkAboutAVAGO TECHNOLOGIES BLDG. 4 WEST EXPANSION - MJA/FDP - FDP130006 - SUBMITTAL DOCUMENTS - ROUND 2 - DRAINAGE REPORT (3)AVAGO TECHNOLOGIES – BUILDING 4 WEST
ANNEX EXPANSION AND SITE
DEVELOPMENT
EROSION CONTROL REPORT /
STORMWATER MANAGEMENT REPORT
CITY OF FORT COLLINS, COLORADO
REV. MAY 21st, 2013
MARCH 25TH, 2013
MARTIN/MARTIN PROJECT NO. 13.0091
FDP 130006
PREPARED FOR: AVAGO TECHNOLOGIES (APPLICANT)
4380 ZIEGLER ROAD
FORT COLLINS, CO 8025-9790
(970) 288-0344
PAUL TANGUAY
PREPARED BY: MARTIN/MARTIN, INC.
12499 WEST COLFAX AVENUE
LAKEWOOD, COLORADO 80215
PHONE: (303) 431-6100
PRINCIPAL IN CHARGE: MATTHEW B. SCHLAGETER, P.E.
PROJECT MANAGER: PETER S. BUCKLEY, P.E. 303-431-6100 x246
PROJECT ENGINEER: BRET M. SMITH, E.I.T. II
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A. GENERAL REQUIREMENTS................................................................ 4
PROJECT LOCATION:................................................................................................ 5
NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY: ................................ 6
EXISTING CONDITIONS: .......................................................................................... 6
DISTURBED AREA ESTIMATES: ............................................................................. 6
EXISTING PERCENT VEGETATION GROUND COVER: ..................................... 6
EXISTING SOIL TYPE / EROSION POTENTIAL: .................................................. 6
RECEIVING WATERS:................................................................................................ 7
ANTICIPATED ALLOWABLE SOURCES OF NON-STORMWATER
DISCHARGE:................................................................................................................ 9
PROPOSED PHASES FOR MAJOR ACTIVITIES: .................................................. 9
B. STORMWATER MANAGEMENT CONTORLS: ................................ 10
SWMP ADMINISTRATOR: ....................................................................................... 10
IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES:.......................... 11
DESCRIPTION OF STRUCTURAL AND NON-STRUCTURAL BMP’S .............. 15
C. SEQUENCED BMP IMPLEMENTATION.......................................... 21
GENERAL.................................................................................................................... 21
INITIAL ....................................................................................................................... 21
INTERIM..................................................................................................................... 22
FINAL .......................................................................................................................... 23
D. INSPECTION AND MAINTENANCE PROCEDURES ..................... 24
E. FINAL STABILIZATION...................................................................... 25
SOIL AMMENDMENTS ............................................................................................ 25
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PERMANENT SEED MIX ......................................................................................... 26
F. REFERENCES ....................................................................................... 27
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A. GENERAL REQUIREMENTS
This report represents a Stormwater Management Plan (SWMP) for the proposed Avago
Technologies - Building 4 West Annex Expansion and Site Development (hereafter
referred to as “PROJECT”). This plan was prepared based upon the regulatory
requirements and guidelines set forth by the Colorado Department of Public Health and
Environment Water Quality Control Division – Stormwater Program’s “Stormwater
Management Plan Preparation Guidance” April 2011 revision; the “Urban Storm
Drainage Criteria Manual – Volume 3”, current revision, the City of Fort Collins
Standards and Specifications, and the document provided by the City of Fort Collins
entitled “RE: Erosion Control Report and Drawing Requirements Accompanying
Document”.
This report identifies potential sources of pollution which may reasonably be expected to
affect the quality of stormwater discharges associated with construction. Furthermore,
this report describes the practices to be used to reduce, or possibly eliminate, these
potential pollutants from impacting the quality of water. The SWMP shall be completed
and implemented by the time construction activities begin until final stabilization. The
SWMP shall be revised as necessary during construction activities so that it accurately
reflects the conditions and current practices found on site as construction progresses. A
copy of the current updated SWMP shall be kept on site at all times and available for
review by all jurisdictions having authority over stormwater discharge from the project
site.
This report puts forth recommendations for Best Management Practices (BMPs) and
provides a description and/or detailed drawings of how these practices are to be installed,
implemented and maintained. The contractor is responsible for complying with ALL
requirements of the Colorado Department of Health and Safety’s Storm Water Discharge
Permit including any changes to this SWMP to meet the requirements of the Permit.
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PROJECT LOCATION:
The PROJECT site is located on the Hewlett-Packard Campus (hereafter referred to as
“CAMPUS”) in Lot 2 of the Preston-Kelley 2
nd
Subdivision, found in the Southwest ¼ of
Section 33, Township 7 North, Range 68 West of the 6
th
Principal Meridian, City of Fort
Collins, County of Larimer, State of Colorado. The PROJECT address is 4380 Ziegler
Road. The overall site consists of 8.80 acres of disturbed area.
The overall CAMPUS is bound to the north by Hidden Pond Drive, to the east by the
Fossil Creek Drainage Ditch, to the south by East Harmony Road, and to the west by
Ziegler Road. The PROJECT site is bound to the north by an existing field and
Technology Parkway (“Ring Road”), to the east by the existing Hewlett Packard Building
4, to the south by existing landscaped areas and an asphalt parking lot, and to the west by
Technology Parkway. Refer to the vicinity map below and in the Appendix.
Figure 1: Vicinity Map, NTS
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NATURE AND PURPOSE OF CONSTRUCTION ACTIVITY:
The proposed development will include the construction of an expansion to the existing
Building 4, private asphalt and concrete drives, and utility infrastructure necessary to
service the proposed building. The footprint of the building expansion covers
approximately 80,000 SF. Additionally, drainage facilities designed to improve
Stormwater Quality are proposed for the site in accordance with Section 3.4.3 Water
Quality of the City of Fort Collins Municipal Code.
EXISTING CONDITIONS:
The existing site topography generally slopes from west to east at approximately 0.7
percent. Native grasses or existing asphalt drives and parking cover a large majority of
the site. A large portion of the existing parking lot located west of the Building 4
Expansion footprint is proposed for demolition in order to maintain compliance with the
“Hewlett-Packard Building 4 Drainage Report”, by Sear-Brown Group, 1999.
DISTURBED AREA ESTIMATES:
Total Site Area: 14.91 Acres
Total Area Disturbed: 14.91 Acres
EXISTING PERCENT VEGETATION GROUND COVER:
The existing vegetative cover consists of landscaped areas with short grasses, trees, and
shrubs in the existing islands, medians, and landscaped areas in front of existing
buildings. These existing landscaped areas are estimated to have 98-100% vegetation
ground cover. Additionally, large native areas are located west of the proposed Building
4 Expansion footprint. These native areas are estimated to have 50% vegetation ground
cover.
EXISTING SOIL TYPE / EROSION POTENTIAL:
According to the “Geotechnical Engineering Report” produced by Terracon Consultants,
Inc., dated September 4, 2012, the existing soils consist of fill materials consisting of
sandy lean clay with various amounts of sand and gravel, and in-situ poorly graded sand
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with gravel. Based on the results of borings, claystone bedrock is located at a maximum
depth of exploration of 39.7 feet. Groundwater was observed at a maximum elevation of
4982.6’, and a minimum depth of 18’ below existing grade. The soils on site are typically
SCS Type C Hydrologic Soils. Type C soils generally exhibit a high potential for runoff
during rainfall which may lead to an increased probability for erosion. A USDA web soil
survey of the CAMPUS states that the soils consist mostly of Nunn clay loam. A copy of
the web soil survey is referenced in the Appendix.
RECEIVING WATERS:
According to the City of Fort Collins website, the CAMPUS belongs to the Fox
Meadows Drainage Basin, which encompasses approximately 2.4 square miles in
southeast Fort Collins. The Basin is bound by Horsetooth Road on the north, Lemay
Avenue on the west, Harmony Road on the south, and the Cache La Poudre River on the
east. The basin is primarily developed with residential development, some commercial
areas and the Collindale Golf Course. The basin does not include a major drainageway
for conveying flows through the basin. Storm runoff flows through a network of storm
sewers, local drainage channels and detention ponds from west to east; ultimately
discharging into the Cache La Poudre River.
The PROJECT site is specifically divided into two historic basins - North and South. The
majority of the proposed PROJECT site discharges north to a regional channel. The
channel was designed for the 100-year storm and discharges to the North Pond on the
CAMPUS. Stormwater detention and water quality treatment for the CAMPUS is
provided by four on-site ponds located in the SE corner of the CAMPUS. These ponds
are constructed as Extended Detention Basins (EDBs). The North Pond is a dry bottom
pond. The South Pond, Southwest Pond, and Dam Pond are wet ponds. From the regional
channel, runoff enters the CAMPUS North Pond, which then flows into the South Pond,
which then flows into the Dam Pond before flowing off-site and eventually into the
Cache La Poudre River. Added water quality benefits are gained via the regional channel
along the north side of the campus which is constructed as a Grass Swale. This channel
provides initial water quality treatment to the north-flowing basins in the PROJECT area
prior to treatment in the CAMPUS ponds.
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Runoff from the southern portion of the PROJECT site is conveyed via on-site storm
sewer into the CAMPUS Southeast Pond, which then flows into the South Pond, which
then flows into the Dam Pond before flowing off-site and eventually into the Cache La
Poudre River.
Figure 2: Major Drainage Basin
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ANTICIPATED ALLOWABLE SOURCES OF NON-STORMWATER
DISCHARGE:
In addition to discharge from storm water, landscape irrigation return flows may be
anticipated from tributary landscaped areas. There are no wetlands or springs anticipated
to contribute to site discharge.
PROPOSED PHASES FOR MAJOR ACTIVITIES:
*Note: The following is a general overview of major construction phases. For a detailed
review of specific activities and associated BMPs, refer to the Construction Sequencing
Charts on the erosion control plans and in Section C of this report.
Phase 1: The first phase of construction activity on the B4 West Annex project will
include selective demolition, clear and grub, over-lot grading, and some underground
utility construction. This is tentatively scheduled to begin on June 24
th
2013. Prior to any
of the aforementioned activities beginning all BMPs will be installed per the erosion
control drawings and details. Once installed and inspected by J.E. Dunn Construction
Phase 1 activity will begin. The major BMPs in place during phase one will include S-
Fence, VTC, Concrete Washout, existing Inlet Protection as required, and Stockpile
management and protection.
Target Start: 6/24/2013
Target Completion: 7/24/13
Phase 2: The second phase of construction activities will include major foundation
activities, under-slab MEP activities and the balance of underground utility activities.
This phase will begin immediately following the completion of over-lot grading. All
BMPs will be maintained during this phase of construction with the VTC and CWA
BMPs seeing increased activity as a result of concrete operation. Stockpile activity during
this phase will be minimal. Any additional BMPs required of our interim erosion control
plan will be installed at this time and will be maintained until stabilization activities
begin.
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Target Start: 7/24/13
Target Completion: 1/5/2014
Phase 3: Phase three of the B4 West Annex Project will include all enclosure activities.
This will include steel and pre-cast deliveries and erection. This will also include any
exterior curtain wall or metal panel installation as required. Roofing activities will also be
completed during this time in order to provide a dry building. No changes to interim
BMPs should be expected but all BMPs will be maintained as required during phase 3
construction.
Target Start: 12/1/14
Target Completion: 4/1/14
Phase 4: The final phase of activity for the B4 West Annex project is miscellaneous
interior build-out and site-work activities. This will also include final selective
demolition, site grading, and landscaping activities. Stockpile management and protection
will re-occur during this phase as well. Stockpile management and protection locations
shall be redlined on the final erosion control plan at as necessary during this phase.
Finally, near the end of Phase 4, stabilization activities will begin and final BMPs will be
placed.
Target Start: 4/1/14
Target Completion: 7/1/14
B. STORMWATER MANAGEMENT CONTORLS:
SWMP ADMINISTRATOR:
Mike Disler, Superintendent
J.E. Dunn Construction Company
2000 S. Colorado Blvd., Suite 12000
Denver, CO, 80222
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The SWMP administrator shall be responsible for developing, implementing,
maintaining, and revising the SWMP.
IDENTIFICATION OF POTENTIAL POLLUTANT SOURCES:
The potential for each of the possible pollutant sources to contribute pollutants to storm
water discharge in the list below have been evaluated with regards to the frequency of the
activity, the physical characteristic of the area, the ability of containment measure to
prevent and contain leaks and/or spills, proximity to waterways or drainage facilities, the
concentration and toxicity of materials and the possible contamination of storage
facilities and materials. If it was determined that the source has a reasonable chance of
contributing pollutants to storm water discharge, a specific BMP or combination of
BMPs has been identified to address or mitigate that potential.
All Disturbed and Stored Soils:
Disturbed Area: 14.91 acres
Location of Stockpile: Proposed stockpile locations have been shown on the plans. At the
discretion of the SWMP Administrator, actual stockpile locations may vary during
construction; however, the current location of stockpiles shall be accurately reflected by
redlining the construction plan set.
Disturbed Soils: Soils disturbed during construction activities (grading, foundation
excavation, utility trenching, etc.) have the potential to introduce sediment into runoff.
Silt fence will be used to prevent sediment from leaving down-gradient of disturbed
areas. Surface roughening will be used to stabilize disturbed areas after 14 days.
Temporary seeding and mulching will be used to stabilize disturbed areas after 30 days.
Inlet protection will be used to help prevent sediment from entering storm sewer. Street
sweeping shall be performed daily when disturbed soils have tracked onto paved streets.
Construction fence will be used to minimize access to undisturbed areas and limit the
area of disturbed soil. Rock socks will be used at sidewalk chase outfalls in order to catch
sediment from concentrated runoff.
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BMP’s: Temporary and Permanent Seeding, Mulching, Stockpile Management, Silt Fence,
Inlet Protection, Street Sweeping and Vacuuming, Construction Fence, Surface
Roughening, Rock Socks
Demolition of Existing Structures:
Demolition of existing structures will produce visible dust, debris and waste requiring
proper containment and disposal. Demolition activities on the B4 West Annex Job
include: selective demolition of the existing Building 4 west wall for new addition, utility
demolition within proposed expansion footprint, and demolition of asphalt and concrete
paved areas to provide for the new building site. S-Fence will be used to ensure no
sediment leaves the site. Silt fence will be placed down gradient of the proposed
demolition in order to provide a barrier to catch sediment from runoff leaving the site.
BMPs: Spill Prevention and Containment, Inlet Protection, Good Housekeeping,
Construction Fence.
Vehicle Tracking of Sediment:
In order to prevent sediment from leaving the site via exiting vehicles, a vehicle tracking
control pad shall be used for site access. Construction fence shall be used to limit access
to the site from any area other than through the vehicle tracking control pad. Street
sweeping shall occur whenever sediment is carried onto the street from the site. Nearby
inlets shall be protected.
BMP’s: Vehicle Tracking Control, Construction Fence, Street Sweeping and Vacuuming,
Inlet Protection
Management of Contaminated Soils:
Pre-existing contaminated soils are not anticipated. The following BMP’s shall be
implemented to prevent contamination, and control contamination in the event of a spill:
BMP’s: Good Housekeeping Practices, Stabilized Staging Area, Spill Prevention,
Containment and Control
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Loading and Unloading Operations:
Loading and unloading operations can result in particulate generation, which can be
carried off the site and ultimately collected by runoff.
BMP’s: Where possible, dump trucks and waste trucks entering/exiting the site shall be
covered. The property shall be watered to avoid particulate generation from
loading/unloading. Loading and unloading shall take place on the Stabilized Staging Area
and away from inlets.
Outdoor Storage Activities:
Wherever possible, chemicals shall be stored in a covered location to prevent rainwater
from directly impacting storage containers. The spill prevention, containment, and
control BMP shall be utilized minimize risks from storing chemicals outside. All workers
on the site shall be trained in spill prevention, containment, and control.
Building materials shall be stored on the Stabilized Staging Area in order to minimize
erosion while accessing stored materials.
BMP’s: Spill Prevention, Containment, and Control, Stabilized Staging Area
Vehicle and Equipment Maintenance and Fueling:
On-site vehicle equipment maintenance and fueling increases the risk for spilling the
chemicals used for these activities. Where practical, these activities should occur off-site.
When on-site fueling and maintenance is warranted, it shall occur on the stabilized
staging area. The location of the stabilized staging area is shown on the erosion control
plans. If the location of the stabilized staging area is moved during construction, the
updated location shall be redlined on the approved erosion control plan set.
BMP’s: Good Housekeeping Practices, Stabilized Staging Area, Spill Prevention,
Containment and Control
Sawcutting:
Sawcutting asphalt and concrete has the potential to introduce sediment into stormwater
runoff. Downstream inlets shall be protected. Plan sawcutting for days when dry weather
is expected. Do not wash any paved surface into receiving storm drain inlets or natural
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drainageways. Instead, loose material should be swept or vacuumed following sawcutting
operations.
BMP’s: Street Sweeping and Vacuuming
Significant Dust or Particulate Generating Processes:
Dump Trucks and waste trucks shall be covered whenever possible. Water shall be used
to minimize particulate generation. The City of Fort Collins requires that the site be
continuously watered in order to minimize particulate generation from wind. If
particulate accumulation results in sediment deposit outside of the site, street sweeping
should occur immediately.
BMP’s: Street Sweeping and Vacuuming
Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents, oil, etc:
Wherever possible, chemicals shall be stored in a covered location to prevent rainwater
from directly impacting storage containers. The spill prevention, containment, and
control BMP shall be utilized to minimize risks from storing chemicals outside. Workers
on the site shall be trained in spill prevention, containment, and control. Additionally,
wherever possible, chemicals should be used away from storm inlets and/or natural
drainageways. For example, refueling should take place at least 50’ away from storm
sewer inlets.
BMP’s: Spill Prevention, Containment, and Control
On-site waste management practices:
Trash, demolition debris, and waste can be carried by storm water runoff and/or wind,
contaminating runoff water, and clogging existing facilities. To mitigate this risk,
dumpster should be closed whenever feasible. Dumpsters and/or waste piles shall be
located a minimum of 50ft from any inlet structures or watercourses. Inspection of
dumpsters for leaks should occur with weekly SWMP inspections.
BMP’s: Good Housekeeping Practices
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Dedicated asphalt and concrete batch plants:
No dedicated asphalt or concrete batch plants will be used on site.
BMP’s: None.
Concrete truck/equipment washing, including the concrete truck chute and associated
fixtures and equipment:
Concrete waste including waste produced after washing trucks, pumps, and associated
fixtures and equipment can be easily tracked onto adjacent streets with the potential to
contaminate stormwater runoff. Concrete washout areas are specifically indicated on the
plans and should be located a minimum of 50ft from any inlet structures or watercourses.
At the discretion of the SWMP Administrator, actual concrete washout locations may
vary during construction; however, the current location of concrete washouts shall be
accurately reflected by redlining the construction plan set.
BMP’s: Concrete Washout Area
Non-industrial waste sources such as workers trash and portable toilets:
Good housekeeping shall be practiced on site in order to eliminate stormwater
contamination risk from worker trash and portable toilets. Provide an adequate amount of
trash bins in order to encourage compliance across all workers. Stake portable toilets to
the ground in order to minimize the risk of overturning. Updated portable toilet locations
shall be redlined on the construction plan set. Portable toilets shall be located a minimum
of 50ft from any inlet structures or watercourses.
BMP’s: Good Housekeeping
DESCRIPTION OF STRUCTURAL AND NON-STRUCTURAL BMP’S
In addition to the descriptions below, the contractor is encouraged to refer to the “Urban
Storm Drainage Criteria Manual – Volume 3” for comprehensive BMP information
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Temporary and Permanent Seeding (TS/PS)
Final stabilization for landscaped areas will be achieved when vegetation has achieved
cover which matches the existing vegetative cover. Because a large area of native grass
will be replaced with permanent seeding, vegetative cover is expected to be improved
from existing conditions as a result of the proposed development. If temporary seeding
becomes necessary (any disturbed area which has not reached final stabilization within 30
days), the following seed mix or approved equal shall be used:
The use of mulch in conjunction with temporary seeding shall be required to help protect
the seedbed and stabilize the soil. Clean, weed- and seed-free, long-stemmed grass 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.
Good Housekeeping Practices (GH)
Good housekeeping is a source control BMP. Good housekeeping practices are designed
to maintain a clean and orderly work environment. Poor housekeeping practices result in
increased waste and potential for stormwater contamination. A cleaned and orderly work
site reduces the possibility of accidental spills caused by mishandling of chemicals and
equipment.
Vehicle Tracking Control (VTC)
Vehicle Tracking Control is a sediment removal device for construction equipment and
vehicles entering/exiting the site (as described in the UDFCD criteria). Vehicle tracking
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control pads shall be installed at the single access point to the site (at the west drive cut
for the Ring Road) prior to any land-disturbing activity. VTC pads shall be maintained in
working order according to the VTC detail in the erosion control plans.
Stabilized Staging Area (SSA)
The stabilized staging area shall be used for parking, storage, and unloading and loading
operations. The SSA shall consist of 3” minimum thickness of granular material, and
shall be large enough to fully contain parking, storage, and unloading and loading
operations. For this PROJECT site, the existing asphalt parking lot will be used as a SSA
until demolition. After demolition, a new SSA must be installed.
Construction Fence (CF)
A construction fence restricts site access to designated entrances and exits and delineates
construction site boundaries.
Concrete Washout Area (CWA)
The Concrete Washout Area is a sediment-trapping device as described in the UDFCD
criteria. Concrete washout area(s) shall be installed prior to any concrete placement on
site. All concrete delivery truck chutes, concrete pumps, and any other concrete placing
devices shall be cleaned out at the designated concrete washout area. The discharge of
water containing concrete waste and/or sediment to adjacent waterways, wetlands, other
properties, etc. is prohibited. The contractor shall redline the approved SWMP located in
the construction trailer to indicate the current location of all CWAs.
Stockpile Management (SM/SP)
Stockpile management includes measures to minimize erosion and sediment transport from soil
stockpiles. It 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. Updated SM/SP locations shall be redlined on the approved SWMP located in the
construction trailer. This includes the location of the final SM/SP during final grading.
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Silt Fence (SF)
Silt Fence is a sediment-trapping device as described in the UDFCD criteria. Silt fence is to be
inspected and repaired/replaced as necessary. Silt fence will only be used for stockpile protection
for this Project because natural berms will prohibit sediment-laden runoff from exiting the site.
Street Sweeping and Vacuuming (SS)
Street sweeping is required when sediment has washed onto paved surfaces. This is to be done in
a timely manner either by hand or street sweeper at a minimum of one time per week. Flushing of
sediment with water is prohibited.
Surface Roughening (SR)
Any disturbed areas which have not reached final stabilization within two weeks of being
disturbed shall receive surface roughening.
Rock/Curb Socks (RS/CS)
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 right 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. Rock socks shall be installed on the
proposed 3’ concrete pan (sidewalk chase) outfalls once constructed.
Inlet Protection (IP)
Inlet protection shall be used at all of the locations shown on the approved SWMP plans. Inlet
protection for proposed inlets should be installed immediately after proposed inlet installation.
Inlet protection is to be inspected and repaired/replaced as necessary.
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Sediment Control Log (SCL)
Sediment Control Log (SCL) 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 (“straw
wattles”) as described in the UDFCD criteria. SCLs shall be installed as shown on the approved
SWMP plans in order to function as a check dam in the proposed grass swale. SCLs shall be
installed as soon as the grass swale is graded. SCLs are to be inspected and repaired/replaced as
necessary. SCL’s shall extend a minimum of 10’ total in length and shall be centered on the
bottom of the grass swale.
MATERIAL HANDLING AND SPILL PREVENTION
If a spill should occur, the City of Fort Collins (970)-224-6015, and the Colorado
Department of Public Health and Environment (877)-518-5608) must be notified.
The contractor shall keep specific procedure manuals for material handling information,
accident procedures, and spill handling. At a minimum, the contractor shall adhere to the
following:
Material and Equipment Storage:
Nonhazardous materials that are to be stockpiled on the site but not installed within 14
days of arrival shall be stored in the construction staging and/or material storage area.
Materials delivered to the site which will be installed within 14 days of arrival may be
stored nearer to the point of installation. These materials include but are not limited to
pipe, precast structures, fire hydrants, tees, valves, and misc. fittings. Construction and
maintenance equipment such as hand tools and small parts shall be stored within the
stabilized storage area or materials storage area in watertight containers. Hazardous
materials that are to be stored on-site such as, but not limited to, oil filters, petroleum
products, paint, and equipment maintenance fluids shall be stored in structurally sound
and sealed containers clearly marked “Hazardous Material”. These containers are to be
located within the stabilized storage areas and/or material storage area.
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Spill Response/Management of Contaminated Soils:
• Containment and cleanup of spills should begin promptly after the spill is
observed
• Contain medium sized spills with absorbents (e.g., kitty litter, saw dust)
and use inflatable berms or absorbent snakes as temporary booms for the
spill. Store and dispose of absorbents properly.
• For large spills, first contain the spill and plug storm drain inlets where the
liquid may migrate off-site, then clean up the spill.
• Excavation of spill areas to removed contaminated material may be
required where large spills occur on unpaved surfaces.
• Contain the entire spill if possible. If immediate containment is not
possible, use curbing to route spilled material to a collection basin. The
containment area must have an impermeable surface.
• Material from the spill area must be disposed of or recycled according to
local, state, and federal standards.
Vehicle and Equipment Fueling and Maintenance:
The fueling of vehicles and equipment which occurs on site shall occur in the stabilized
storage area. Only minor equipment maintenance shall occur on-site. All major
equipment maintenance shall be performed off-site. Any equipment fluids generated from
maintenance activities will be disposed of into designated drums stored on spill pallets.
Absorbent, spill-cleanup materials and spill kits shall be available at the stabilized storage
area and/or materials storage area. Drip pans shall be placed under all equipment
receiving maintenance. Drip pans shall also be placed under vehicles and/or equipment
parked overnight which have known fluid leaks.
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Waste Management and Disposal, Including Concrete Washout:
All hazardous waste materials shall be disposed of in structurally sound and sealed
containers located within a hazardous materials storage area in the stabilized storage area.
Hazardous waste materials will be stored in appropriate and clearly marked containers
and segregated from other non-waste materials. Secondary containment shall be
provided for all waste materials in the hazardous materials storage area and will consist
of commercially available spill pallets. Additionally, all hazardous waste materials shall
be disposed of in accordance with federal, state, and municipal regulations. Non-
hazardous waste materials may be disposed of into on-site dumpsters. Construction trash
dumpsters should be located in the stabilized storage area. Dumpsters should have a
secure lid and meet all federal, state, and municipal regulations. Only trash and
construction debris from the site should be deposited in these dumpster. No construction
materials shall be buried on-site.
All construction personnel shall be instructed regarding the correct disposal of trash and
construction debris, as well as procedures for hazardous waste disposal. The SWMP
Administrator shall be responsible for seeing that these practices are followed.
C. SEQUENCED BMP IMPLEMENTATION
GENERAL
• Good Housekeeping
• Material Handling and Spill Prevention
INITIAL
Refer to sheet C202.
Prior to Asphalt Demolition, Clear and Grub
• Install Existing Inlet Protection
• Install Construction Fence
• Install Silt Fence
During and immediately following Asphalt Demolition, Clear and Grub
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• Install VTC (VTC shall be installed as soon as possible during
demolition. Limit site access until VTC is in place. Construction fence
around VTC should limit access to site through the VTC only
• Limit disturbance to those areas planned for disturbance and protect
undisturbed areas within the site with construction fence, flagging, etc.
• Sweep or Vacuum sediment as needed.
Maintenance
• Inspect all BMP’s after every precipitation event, and at a minimum of
once per week
• Replace/repair BMP’s as necessary
• Check for sediment deposition on streets and sweep daily
INTERIM
Refer to sheet C203.
Before Over-lot Grading
• Install Stabilized Staging Area (Install construction trailer, stake portable
toilets, and lay down dumpsters as needed)
During Site Grading/Foundation Excavation
• Implement stockpile management
• Install Silt Fence around stockpiles
• Stockpiles shall be no higher than ten feet
• Water the site as needed to prevent dust from wind and
loading/unloading operations. Do not water to the point that runoff is
created.
• Implement Surface Roughening and/or Temporary Seeding as required
• Install SCL as soon as grass swale is graded
During Utility installation
• Install inlet protection immediately after inlets are installed
During Vertical Construction
• Concrete Washout Areas as needed
• Implement materials management and good housekeeping practices
• Use perimeter controls for temporary stockpiles from foundation
excavations
23
During Paving/Concrete Installation
• Concrete Washout Areas as needed for concrete paving
• Install rock socks at 3’ concrete chases
Maintenance
• Inspect all BMP’s after every precipitation event, and at a minimum of
once per week
• Replace/repair BMP’s as necessary
• Check for sediment deposition on streets and sweep daily
• Dispose of Concrete Washout Areas in a timely fashion.
• Update Erosion Control Plans to reflect current locations of major
BMP’s including SSA, CWA, and SP
FINAL
Refer to sheet C204.
• Install permanent seeding in landscaped areas shown on the plans
• Do not remove BMP’s until final stabilization is achieved
• In landscaped areas, individual plant density of at least 70% is required
• Implement stockpile management if necessary for final grading. Redline
location on approved plan in construction trailer.
Maintenance
• Inspect all BMP’s after every precipitation event, and at a minimum of
once per week
• Replace/repair BMP’s as necessary
• Check for sediment deposition on streets and sweep daily
• Dispose of Concrete Washout Areas in a timely fashion.
24
D. INSPECTION AND MAINTENANCE
PROCEDURES
The erosion and sediment control measures shall be inspected by the contractor and
evaluated continually throughout the construction period. Inspections shall be performed
weekly and after all storm events resulting in precipitation of one-half inch or more.
Inspections shall also be required after significant snowmelt events which have the
potential to cause surface erosion. Inspections required after storm and/or snowmelt
events shall be conducted in a timely manner, but no more than 24 hours after the end of
the storm event. If construction activities have been completed, but final stabilization has
not yet been achieved, the frequency of inspections may be reduced to once every thirty
(30) days.
Inspections shall be conducted and findings documented pursuant to the State Permit.
Inspections shall be recorded on an inspection form acceptable to both the State of
Colorado and the City of Fort Collins. See the Appendix for a sample inspection form.
Inspections shall ensure adherence to all state and local jurisdictional requirements.
Inspections shall also ensure compliance with the erosion control measures stipulated in
this report. Lost or damaged erosion and sediment control devices shall be noted in the
inspection report and shall be repaired or replaced in a timely manner, but in no case
more than seven (7) days after the inspection. Ineffective or inadequate devices shall also
be noted in the inspection report and should be modified or replaced with an adequate
device. Replacement and/or modification of ineffective or inadequate devices shall be
completed in a timely manner, but in no case more than seven (7) days after the
inspection. Any observed differences or modifications to the SWMP made after an
inspection shall be shown on an updated SWMP in a timely manner.
Any reports of non-compliance and/or violations shall be recorded. A brief explanation
shall detail how the instance of non-compliance and/or violation was rectified, and how
future violations will be avoided. The report shall then be signed indicating that site is
25
once again in compliance by both the individual performing the inspection and the
SWMP administrator.
The permit operator shall keep a record of all inspections on site with the SWMP Plan.
These records shall be made available to the City of Fort Collins or other authorities
having jurisdiction upon request.
Wherever inspection requirements differ between governing jurisdictions and/or this
SWMP, the more stringent requirements shall apply.
E. FINAL STABILIZATION
Final stabilization will be achieved when all disturbed areas have either been paved with
asphalt/concrete or landscaped according to the project design plans. In landscaped areas, an
individual plant density of at least seventy (70) percent is required for final stabilization.
SOIL AMMENDMENTS
Topsoil is to be stockpiled and reused. No specific soil amendments are required for the site.
26
PERMANENT SEED MIX
Clayey Soils (based on 80 seeds/ft
2
and total of 15.9 lbs/PLS/acre)
Drill between ¼”- ½” deep.
Common
Name
Scientific
Name
Drilled
lbs/PLS/acre
Season Mature
Height (in.)
Form
Sideoats
Grama
Bouteloua
curtipendula
2.8 Warm 10-30” Bunch
Buffalograss
Bouteloua
dactyloides
6.2 Warm 4-8” Sod
Blue Grama
Bouteloua
gracilis
0.6 Warm 4-16” Bunch/sod
Inland
Saltgrass
Distichlis
stricta
0.9 Warm 4-16” Sod
Bottlebrush
squirreltail
Elymus
elymoides
1.8 Cool 4-20” Bunch
Prairie
Junegrass
Koeleria
macrantha
0.2 Cool 6-24” Bunch
Western
Wheatgrass
Pascopyrum
smithii
3.2 Cool 12-32” Sod
Alkali Sacaton
(plains-
montane, wet-
dry alkaline)
Sporobolus
airoides
0.3 Warm 20-40” Bunch
• All materials furnished shall be free of Colorado State noxious weeds as defined
in Article III, Section 21-40 of the Code of the City of Fort Collins.
• All of the above seed mixes are based on one acre. When ordering, amounts need
to be recalculated to fit actual acreage.
27
F. REFERENCES
1. Colorado Department of Public Health and Environment, Water Quality Control
Division – Stormwater Program, “Stormwater Discharges Associated with
Construction Activity, Stormwater Management Plan Preparation Guidance”,
revised 4/2011
2. Urban Storm Drainage Criteria Manual, Volumes 1-3, Urban Drainage and Flood
Control District, Rev. June 2001, Internet rev. October 2007.
3. “RE: Erosion Control Report and Drawing Requirements Accompanying
Document”. Received 2/6/2012 via email from Jesse Schlam, City of Fort Collins,
Utilities. JSchlam@fcgov.com
miles
km
1
1
ENGINEER'S OPINION OF PROBABLE COST
Project: AVAGO B4 WEST ANNEX Date: 29-Apr-13
Location: 4380 ZIEGLER ROAD Job No.: 13.0091
Subject: SECURITY CALCULATIONS Prep. By: BMS
Client: AVAGO TECHNOLOGIES Ckd. By: PB
Note: Any opinions of price, probable project costs or construction costs rendered by MARTIN/MARTIN represent
its best judgment and are furnished for general guidance. MARTIN/MARTIN makes no warranty of guarantee,
either expressed or implied as to the accuracy of such opinions as compared to bid or actual cost.
Item No. Item Description Units Quantity Unit Price Item Cost
1 Concrete Washout Area EA 3 $ 100.00 $ 300.00
2 Construction Fence LF 4220 $ 2.00 $ 8,440.00
3 Inlet Protection EA 25 $ 20.00 $ 500.00
4 Permanent Seeding and Mulching AC 9.5 $ 2,500.00 $ 23,750.00
5 Stabilized Staging Area SF 40000 $ 0.25 $ 10,000.00
6 VTC EA 1 $ 1,000.00 $ 1,000.00
7 Curb Sock/Rock EA 20 $ 10.00 $ 200.00
8 Sediment Control Log EA 10 $ 20.00 $ 200.00
Remarks: Cost of Items: $ 44,390.00
50% Contingencies: $ 22,195.00
$ 37,275.00 Subtotal: $ 66,585.00
14.91 ACRES @ $2,500 per ACRE
Cost to revegetate is less than total BMP cost,
use Total BMP Cost for required security Total Cost: $ 66,585.00
Cost to revegetate only:
run date: 4/29/2013 7:06 PM Page 1 of 1
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
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
Common
a
Name
Botanical
Name
Growth
Seasonb
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass Agropyron cristatum
'Ephriam' Cool Sod 175,000 2.0
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder' Warm Sod 389,000 1.0
Alkar tall wheatgrass Agropyron elongatum
'Alkar' Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mixc
Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5
Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Total 7.5
Temporary and Permanent Seeding (TS/PS) EC-2
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 wheatgrass
d
Agropyron cristatum
'Ephriam' Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron intermedium
'Oahe' Cool Sod 115,000 5.5
Vaughn sideoats grama
e
Bouteloua curtipendula
'Vaughn' Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln' Cool Sod 130,000 3.0
Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5
Total 17.5
a All of the above seeding mixes and rates are based on drill seeding followed by crimped 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.
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.
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
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
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