HomeMy WebLinkAbout20131662.tiffWhiting Petroleum Corporation
Red Tail Gas Plant Site
EROSION CONTROL AND
STORMWA TER MANAGEMENT PLAN
(SWMP)
Weld County, COLORADO
March 2013
PREPARED FOR:
(APPLICANT)
Whiting Petroleum Corporation
Red Tail Gas Plant
c/o GWD Design
Mike Kraft
621 17th St, Ste 1200
Denver, CO 80293
(303)951-9337
PREPARED BY:
Diamondback Engineering & Surveying. Inc.
12640 W. Cedar Dr. Ste C
LAKEWOOD. COLORADO 80228
(303) 985-4204
PROJECT MANAGER: JOHN ENOCI-IS, P.E.
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TABLE OF CONTENTS
GENERAL INFORMATION AND SITE DESCRIPTION I
STORM WATER MANAGEMENT CONTROLS 3
OTHER CONTROLS 12
INSPECTION AND MAINTENANCE 13
RECORD KEEPING IS
RECORD RETENTION, MONITORING,
NOTIFICATIONS AND FINAL STABILIZATION 16
CALCULATIONS 17
REFERENCES 17
APPENDIX
Vicinity Map
SCS Soils Map
Calculations
FEMA Firm Map (Not Printcd)
GENERAL INFORMATION AND SITE DESCRIPTION
This report represents an Erosion Control Report and a Stonnwater Management Plan for the
Whiting Petroleum - Red Tail Gas Plant site improvements. It was prepared meeting the
regulatory requirements and guidelines set forth by Weld County. Urban Drainage and Flood
Control District, the Colorado Department of Health and Environment - Water Quality Control
Division as well as appropriate provisions of the Colorado Water Control Act and the Federal
Water Pollution Control Act.
The Red Tail Gas Plant site is located to the southwest of the intersection of WCR 127 and WCR
116 in unincorporated Weld County. Red Tail Gas Plant Site is located in the Northeast ''A of
Section 21, Township 10 North, Range 58 West of the Sixth Principal Meridian, County of Weld,
State of Colorado (see Vicinity Map in the Appendix).
The existing site is bounded in all directions by agricultural land. County Road 127 borders the
property to the cast.
Description
The proposed project includes construction of a gas plant and installation of a water quality
detention pond. The surrounding arca is agricultural.
Existing topography of the site slopes at about 134 from the north to the south. The site will be
graded with a I% slope from north to south. Runoff will be captured in a ditch located along the
southern end of the pad. The ditch will convey the runoff to a storm water quality pond located to
the south of the pad.
The site is 40 acres in size. The proposed gas plant pad is 5.7 acres and lies in the southwestern
portion of the overall site. The gas plant site will be surfaced with road base.
The earthwork for the proposed site is expected to be balanced. Proposed raw cut is estimated at
3,950 cubic yards with 3,950 cubic yards of raw fill.
The arca surrounding the site is made up of agricultural land.
Pre -Disturbance Conditions
The site is undeveloped.
There arc not any existing wetlands located on this site.
Soils Information
Soils arc predominantly Kim -Mitchell complex, 0-9% slopes as determined by U.S. Department
of Agriculture Soil Conservation Service. These soils exhibit properties characteristic of
Hydrologic Type B soils. Refer to the SCS Soils Map located in the Appendix.
The runoff coefficient for the existing site in the major 100 -year storm event is approximately
0.50 as partially developed ground (2% impervious). Upon completion of the proposed
improvements, the anticipated 100 -year runoff coefficient is anticipated to be between 0.50 and
0.55 and 6.7% impervious.
Potential Pollution Sources
Potential pollution sources anticipated from the site may be those associated with vehicle
maintenance and fueling activities during construction, piping materials, and waste management
(trash and debris). Please refer to the Materials Handling section of this report regarding
minimization of the impacts of these potential pollutants.
No dedicated concrete or asphalt batch plants shall exist on this site.
Receiving Waters
The existing site drains via overland flow onto the adjacent agricultural land. Thcrc is a drainage
located approximately 1,500 feet down gradient from the site. This drainage is a dry arroyo with
intermittent flows.
The existing site is not located in the 100 year flood plain. Thcrc arc no FIRM Flood Insurance
Rate Maps printed for this area.
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STORMWATER MANAGEMENT CONTROLS
SWMP Administrator
The general contractor or their designated agent shall be the Stormwater Administrator and have
responsibility of supervision and control of all erosion and sediment control conditions on -site.
This individual shall be responsible for developing, implementing, maintaining and revising the
SWMP. Additionally, the SWMP administrator is responsible for obtaining, transferring and
maintaining local and CDHPE permits, orienting and training of staff / workers; certifications,
inspections, inspection logs, and meeting the regulations of all local and governmental
authorities. This individual shall have any necessary training and hold certifications as required
by Jefferson County, the CDHPE and the EPA.
Erosion and Sediment Control Plan
The entire disturbed site shall be paved or landscaped to minimize wind and water erosion. The
methods used to control erosion and sediment during development of the subject property will
comply with Jefferson County Regulations and the non-structural and structural Best
Management Practices (BMP's) described in Volume 3 of the Urban Storm Drainage Criteria
Manual. The predominant pollution expected at the site during construction and under permanent
conditions is sediment in stormwatcr runoff.
Proposed erosion control measures and details arc shown on the Erosion and Sediment Control
plans accompanying this report. The following descriptions arc of specific BMP's utilized during
construction of this project. Refer to the BMP details in the plan set for additional installation
and maintenance specifications.
Structural BMP Descriptions
Concrete Washout Area (('W4)
Purpose:
A concrete washout area is a shallow excavation with a small perimeter berm used to isolate
concrete truck washout operations. Install prior to concrete work on -site construction.
Remove at completion of concrete activities on -site.
Sketch:
Refer to the Concrete Washout Detail located in the plans accompanying this report.
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Method of Installation:
Concrete washout facility should be constructed with a recommended width and length of I0
feet. The quantity and volume should be sufficient to contain all liquid and concrete waste
=enerated by washout operations.
Maintenance:
The concrete washout facility should be maintained to provide adequate holding capacity
with a minimum freeboard of 12 inches below grade. Hardened concrete should he removed
and disposed of regularly to return the facility to a functional condition.
Erosion Conn'ol Blanket (1:(B)
Purpose:
A blanket made of Straw, Coconut or Excelsior to protect erosion from concentrated flows in
swalcs or drainageways. Erosion control Blankets arc also used to protect steep slopes
greater than 4:1 from erosion. Install at the completion of grading activities.
Sketch:
Refer to the Erosion Control Blanket Detail located in the plans accompanying this report.
Method of Installation:
Roll blanket on area to be covered horizontally on the slope or Swale. Key in blanket by
burying the top edge of the blanket using a 6'X6' trench at the top. Secure to the blanket to
the ground using pins per manufacturer's recommendations. Overlap blankets such that the
downgrade blanket is below the upgrade blanket.
Maintenance:
Review blanket for rips, tears and damage after every storm event. Repair and replace as
necessary.
.Sediment Basin (571)
Purpose:
A basin or pond which captures sediment -laden runoff and releases it slowly proving
prolonged settlement times to capture coarse sand and fine grained soil particles. Install prior
to construction and remove upon construction of the on -site detention facility.
Sketch:
Refer to the Sediment Basin Detail located in the plans accompanying this report.
Method of Installation:
Sediment basins shall be excavated per grades in the accompanying detail. Side Slopes of the
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facility shall have a maximum slope of 3: I . An outlet pipe with perforations as shown in the
details and a riprap reinforced overflow weir shall also be constructed.
Maintenance:
Sediment Basins and their outlet pipe shall be inspected bi-weekly and after every storm
event. Make repairs and replace riprap logs as necessary. Sediment should be removed once
it has accumulated to one-half the depth of the basin.
Sediment Coning Log (S'('1)
Purpose:
A sediment control log consists of rolled straw, compost, coconut or excelsior fiber. A
sediment control log is used to filter sediment as runoff passes through the rolled fibers.
Install at commencement of construction or installation of concrete pans. Remove at final
stabilization of site.
Sketch:
Refer to the Sediment Control Log Detail located in the plans accompanying this report.
Method of Installation:
Sediment Control Logs should be placed on the contour. The sediment control log is placed
in a trench (minimum 2" deep) and staked to the ground to prevent movement. Adjacent logs
shall be firmly paced against each other to eliminate all gaps. Sediment Control Logs shall be
staked in an alternating pattern every 24" installed at a 90 degree orientation through the
center of the sediment control log.
Maintenance:
Sediment Control Logs should be inspected every day and after every storm event. Make
repairs and replace logs as necessary. Sediment should be removed once it has accumulated
to one-half the original height of the barrier.
.Silt Pence (SP)
Purpose:
A temporary sediment barrier constructed of woven fabrics stretched across supporting posts.
The bottom edge of the fabric is placed in an anchor trench that is backfilled with compacted
soils. Silt fence is used to filter sediment as runoff passes through the woven fabric. Install
at commencement of construction. Remove at final stabilization of site.
Sketch:
Refer to the Silt Fence Detail located in the plans accompanying this report.
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Method of Installation:
Silt fence should be placed on the contour. On slopes with grades greater than 7%, the silt
fence should be located at least 5 to 7 feet beyond the base. Turn the ends of the silt fence
upslope so that a certain depth of stormwater may be retained in front of the silt fence. The
impounded depth should be at least 12 inches, but no more than the height of the silt fence.
The bottom edge of the fence must be entrenched and backfilled to be effective. The silt
fence should be purchased in a continuous roll cut to the length of the barrier to avoid the use
of joints. When joints arc unavoidable, filter cloth should be spliced together only at a
supporting post, with a minimum 6 -inch overlap, and securely sealed.
Maintenance:
Silt fence should be inspected within 24 hours of a storm event of .25 inches or greater, and at
least once every fourteen calendar days. Sediment should be removed once it has
accumulated to one-half the original height of the barrier. Filter fabric should be replaced
whenever it has deteriorated to such an extent that the effectiveness of the fabric is reduced.
Silt fence should remain in place until disturbed areas have been permanently stabilized. All
sediment accumulated at the fence should be removed and properly disposed of before the
fence is removed.
Vehicle Tracking Control (1 W )
Purpose:
Consists of a rock pad of at all entrancelexit points for a site that is intended to help strip mud
from tires prior to vehicles leaving the construction site. Install at commencement of
construction. Remove at final stabilization.
Sketch:
Refer to the Vehicle Tracking Control Detail located in the plans accompanying this report.
Method of Installation:
Gravel pad installed should use 6" aggregate material at a thickness of at least 9 inches. The
tracking pad should be at least 20 feet wide and 50 feet long and a method of controlling
vehicle egress through the tracking pad should be established.
Maintenance:
Inspect for areas where mud has passed through the gravel pad. Add additional granular
material as necessary.
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Non -Structural BMP Descriptions
Certain non-structural BMP's including watering to control wind erosion and dust, protection of
existing landscaping and trees, surface roughening and seeding and mulching will occur as need
throughout the entire construction process.
Watering:
A watering truck shall be used to prevent dust pollution and wind erosion from occurring on -site.
Site watering shall occur as necessary before, during and after site grading is complete.
Seeding and Mulching (SM)
Drill or broadcast seeding on disturbed areas with grasses and crimping in straw mulch to provide
immediate protection against raindrop and wind erosion and as grass cover becomes established,
provide long-term stabilization of exposed soils. Install upon completion of land disturbance.
Surface Roughening (SR)
Creating a series of grooves or furrows perpendicular to the slope along the contour in all
disturbed, graded areas to trap rainfall, reduce the formation of rill, and gully formation. Install
upon completion of land disturbance prior to seeding/ mulching.
Phased BMP Implementation and Project Phasing
For a site of this size and level of disturbance, initial structural erosion and sediment control
measures including the Construction Fence, Silt Fcncc, Vehicle Tracking Control and Inlet
Protection on existing storm sewer inlets and culverts will be implemented prior to construction
and maintained throughout construction until final stabilization is achieved. Interim measures
Sediment Basin and Inlet Protection on proposed inlets shall occur upon completion of the
proposed storm scwcr construction. Sediment Control Logs, surface roughening and seeding and
mulching shall occur upon completion of the overlot grading phase of construction. Concrete
wash out areas will be constructed prior to construction of Curb and Gutter and the proposed
building addition.
The anticipated start of construction will begin in May 2013 with a completion date in July of
2013. Construction of activities will occur overlapping but will generally follow the sequence
below.
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Project mobilization — May 2013
Installation of all initial erosion control methods — May 2013
Overlot Grading Activities — May 2013
Construction of Facilities — June —July 2013
Interim erosion control methods Water Quality Pond, seeding/ mulching — May 2013
Removal of Erosion Control Measures — August 2013
Materials Handling/ Storage and Waste Management
Materials handled on -site shall be done in such a manner to prevent pollutants from entering
runoff or water sources. Exposed storage of building materials shall be completed at a location a
minimum of 100 feet way from any sources of concentrated flow. Building materials that will be
left dormant for extended periods of time shall be covered.
Trash, debris and spoils shall be properly contained at the end of each day.
Wash water from concrete equipment, masonry and stucco operations arc to be deposited into the
designated concrete washout (CWA).
Construction dumpster(s) will be located on -site to collect construction waste and general trash.
The construction dumpster(s) shall be located a minimum IOU' away from any source of
concentrated flow and be accessible to all construction crews. The general contractor shall
regularly review the level of material in the dumpster(s). When the waste in the dumpster(s)
nears the top of the unit, the dumpstcr provider will be notified to pick up the dumpstcr and return
an empty unit in its place.
All trash, debris and left over materials at the construction site shall be removed promptly.
Burying of wastes on -site is prohibited.
Portable toilets shall be used on -site at a location designated by the Stormwatcr Administrator
away from areas of concentrated flows. These facilities shall be anchored on all four corners to
prevent tipping and spillage of waste. The level of waste shall be monitored and the portable unit
provider contacted to replace the existing unit with an empty unit on -site.
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Fuel tanks and vehicle maintenance, if necessary, shall be at a yet to be determined designated
area in the project and within a lined fuel storage berm minimum 12 -inch high capable of
retaining potential spills. It is at this location that fueling and maintenance of equipment shall
occur. It shall be the responsibility of the Stornnvater Administrator to designate this area and
take appropriate actions to ensure pollution of stormwater does not occur. Fueling' maintenance
areas shall be at least I0) feet from drainage channels/ ditches, waterways, wetlands, storm sewer
systems or environmentally sensitive area. The heavy equipment contractor shall be responsible
for protecting the soil from contamination due to any hydrocarbon and other hazardous spills
associated with his contractual obligations.
Chemicals and fertilizers which may be utilized on -site must be stored in clean dry locations or
covered outdoors. If these materials arc stored outdoors, these pollutant sources shall be located a
minimum 100' away from any sources of concentrated flow and located in leak tight containers.
Typical BMP's for material storage and waste management arc described as follows.
I. Construct an enclosure, container or dike located around the perimeter of toxic materials
or petroleum products storage areas.
2. Store materials or chemicals in a covered area to protect them from rainfall and wind
dispersal.
3. Locate material storage and construction staging as far away from drainage courses as
possible.
4. Perform wash out of concrete trucks and materials off -site or in designated wash out
areas on -site only.
Spill Prevention, Control and Countermeasure Plan
A Spill, Prevention, Control and Countermeasure (SPCC) plan shall be prepared for any areas
where potential spills can occur. This plan shall be prepared prior to the introduction of potential
spill sources to the site and completed per State regulations addressing spill prevention measures,
secondary containment and response procedures in the event of a spill.
A spill kit shall be kept at a designated location on -site at all times throughout the construction
process and clearly marked. This kit will contain the necessary items to contain a spill and
prevent discharge into areas of concentrated runoff and drainagcways. This kit at a minimum
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shall include materials for absorbents, plastics. shovels, instructions for clean up procedures and
materials for the recording of incidents. Containers shall be made available for used absorbents.
After every spill event used spill prevention materials shall be properly disposed of and the spill
kit replenished.
All spills, discharges, overflows, upsets. events and leaky equipment shall be recorded and
documented in the SWMP and MAP immediately.
In the event of a spill, excessive run-off, or any other threat to Stormwater conditions, the
following actions shall take place immediately:
• On -site Stormwater Administrator shall be notified immediately of the concern
• The on -site Stormwater Administrator will assess the situation and develop and
implement a corrective action plan
• The on -site Stormwater Administrator will then document the issue and resolution for
review with the local City or County.
• A copy of the event documentation and resolution shall be mailed/ emailed to the
engineer or plan preparer.
Contact Information
The following agencies shall be contacted in the event of a spill at the site.
• Tri-County Health Department (303) 220-9200
• Colorado Department of Public Health and the Environment (303) 692-3500
• Jefferson County (303) 271-8700
Non -Hazardous Spill Response Procedures
A non -hazardous spill involves the unplanned spillage of any material onto the jobsite that may
enter the stormwater drainage system. Examples include: concrete, petroleum fuel products, etc.
A. Minor Spill — A minor spill involves the spillage of any non -hazardous material that can be
contained. A minor spill is generally defined to be less than 5 gallons in volume.
Response Procedure
I. Stop the spill at the source.
2. Capture, contain and properly dispose of all spilled materials.
3. Notify Stormwatcr Administrator of spill.
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4. Stormwater Administrator to document spill in SWMP log.
5. Stormwater Administrator to notify local City or County Stormwatcr Management team
of spill immediately.
6. Stormwater Administrator to conduct post-mortem and education with parties involved
with spill incident to ensure appropriate precautions can help avoid similar issue in the
future.
B. Significant Spill — A significant spill involves the spillage of any non -hazardous material that
cannot be contained, but is generally more than 5 gallons in volume, or any spilled materials
that enter the storm sewer system.
Response Procedure
I. Stop the spill at the source.
2. Capture, Contain and properly dispose of all spilled materials.
3. Notify Stormwater Administrator of spill.
4. Stormwater Administrator to document spill in SWMP log.
5. Stormwater Administrator to notify local City or County Stormwater Management team
of spill and the CDHPE immediately and provide all parties written documentation of the
event within 5 days.
6. Stormwater Administrator to conduct post-mortem and education with the parties
involved with spill incident to ensure appropriate precautions can help avoid similar issue
in the future.
Hazardous Spill Response Procedures
A hazardous spill involves the unplanned spillage of any hazardous material over one liter onto
the jobsite that may enter the stomnvater drainage system.
Response Procedure
I. Evacuate immediate area, and restrict access to general area.
2. Attend to any injured individuals resulting from spill.
3. Contact local Police and Fire Department.
4. Notify local City or County Stormwater Management team and the CDHPE of spill
immediately and provide them written documentation of the event in 5 days.
5. Stormwater Administrator to document spill in SWMP log
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6. Stormwater Administrator to conduct post-mortem and education with parties involved
with spill incident to ensure appropriate precautions can help avoid similar issue in the
future.
Identification of Potential Pollutant Sources
Below is a list of potential pollutant sources that contribute pollutants to stormwater runoff and
the likely hood of these sources impacting the proposed project.
1. Disturbed and Stored Soils — High
2. Vehicle Tracking of Sediments — High
3. Management of Contaminated Soils — Low
4. Loading and Unloading Operations — Low
5. Outdoor Storage Activities (Building Materials, Fertilizers, Chemicals, etc) — Moderate
6. Vehicle Equipment Maintenance and Fueling — Low
7. Significant Dust or Particulate Generating Processes — Moderate
8. Routine Maintenance Activities Involving Fertilizers, Pesticides, Detergents, Fuels,
Solvents, Oils, etc. — Low
9. On -Site Waste Management Practices (Waste Piles, Liquid Wastes, Dumpsters, etc. -
High
10. Concrete Truck/ Equipment Washing — Moderate
I I. Wastes from Geotechnical Testing - Low
12. Dedicated Asphalt and Concrete Batch Plants — N/A
13. Non -Industrial Waste Sources (Worker Trash and Portable Toilets) — Low
14. Other Areas or Procedures Where Potential Spills Can Occur. - Low
OTHER CONTROLS
Erosion and Sediment Control Plans
Please refer to the Erosion and Sediment Control plans accompanying this report.
Groundwater and Stormwater Dewatering
Groundwater was not encountered during initial Gcotcchnical testing and is unlikely to be
encountered during construction. If groundwater is encountered during construction, dewatering
shall be discharged away from areas of concentrated flow and storm sewers. There arc no wells
12
or mints located on or adjacent to this site.
Proper state permits shall be obtained for all dewatering activities on -site.
INSPECTION AND MAINTENANCE
Inspections of sediment control measures shall occur after any significant wind, precipitation or
snowmelt event that may cause erosion. As a minimum, inspection of all sediment and erosion
control facilities shall be conducted at least every 7 days from March IS through October 31 (i.e.
during the rainfall season) and at least twice a month the remaining portion of the year. In either
case all facilities should be inspected whenever storm events cause runoff.
Upon completion of site inspection, new BMP's shall be installed in areas where erosion and
sediment control is evident and existing BMP's are undersized, inadequate or non-existent.
Please note that the SWMP must be modified as necessary based on additions or deletions of
erosion and sediment measures based on site inspection.
Inspection Scope
• Construction Site Perimeter and discharge locations.
• All disturbed areas.
• Areas used for material storage that arc exposed to precipitation.
• Locations where vehicles access the site for evidence of pollutants leaving the
construction site boundaries.
• Pollutants entering the storm sewer system or discharging to state waters.
• Areas determined to have a significant potential for stormwatcr pollution.
• BMP's identified in the SWMP for installation and maintenance.
Inspection Report/ Records
Results of each inspection shall be recorded on the reporting form (see the Appendix) that will be
kept with the constriction company or their representative. Additional information on inspection
and maintenance can be found in the Appendix. At a minimum, shall include the following
information.
I. Inspection Date.
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2. Name(s) and title(s) of personnel making the inspection.
3. Location(s) of discharges (transport) of sediment or other pollutants from the
construction site.
4. Location(s) of BMP's that need to be maintained.
5. Location(s) of BMP's that failed to operate as designed or proved inadequate for a
particular location.
6. Location(s) where additional BMP's arc needed that were not in place at the time of
inspection.
7. Deviations from the minimum inspection schedule.
R. Descriptions of corrective actions for items 3, 4, 5 and 6 above, dates corrective action(s)
taken, and measures taken to prevent future violations, including requisite changes to the
SWMP, as necessary; and...
9. After adequate corrective action(s) has been taken, or where a report does not identify
any incidents requiring corrective action, the report shall contain a signed statement
indicating the site is in compliance with the permit to the best of the signer's knowledge
and belief.
Required Actions Following Site Inspections
Upon completion of site inspection, repair of existing BMP's shall occur and new BMP's shall be
installed in areas where erosion and sediment control is evident and existing BMP's arc
undersized, inadequate or non-existent.
Please note that the SWMP must be modified based on additions or deletions of erosion and
sediment measures and deficiencies in the SWMP identified during site inspections made in
accordance with part LD.5.c of the CDPS Stormwatcr Construction Permit.
The Stormwater Administrator and/or agent must begin to update the SWMP information
immediately after a deficiency is observed. Complex correction(s) such as redesign and approval
must be completed within 72 hours.
BMP Maintenance
Mitigation measures shall be inspected for at least the following.
• Accumulation of excess sediment and determination of the effectiveness of each
structure is significantly reduced. Removal of accumulated sediment shall occur once a
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50'%, reduction of the design storage capacity becomes evident.
• Damage to structures that need repairing to ensure their effectiveness.
• Addition or elimination of sediment and/or erosion control measures that are designed
to control the movement of soil particles in a practical and effective manner.
• Immediate repair and/or replacement of necessary mitigation measures when total
failures are found.
• Maintenance of BMP's that arc found to no longer function as needed and/ or designed.
BMP Replacement and Additions
BMP's shall be replaced or new BMP's installed to adequately address pollutant sources based on
the findings from inspections. The SWMP must be modified based on modifications to BMP's
made in the field. These modifications must be implemented in a timely manner not more than
seven (7) calendar days following the inspection.
RECORD KEEPING
The project owner shall retain a copy of the approved SWMP and CDPS Stormwater
Construction Permit Approval Letter and Certification from CDHPE. Additionally, the owner
shall retain a copy of any and all inspection documents completed on -site including those
required by the CPDS Ston mwater Permit. All documents shall be retained from the date of
project initiation to the date of final inspection and stabilization at the construction site.
In addition to permit retention and modification(s) of the SWMP, the following information must
also be retained in order to document the required site inspections in all inspection reports.
I. Date of Inspection.
2. Incidences of non-compliance.
3. Measures taken to remediate problems.
4. After measures have been taken to correct any problems and recorded in the report, or
where a report does not identify any incidence(s) of non-compliance, a signed
certification indicating that the site is in compliance must be included in the report.
5. Notes on the need for and performance of preventative maintenance and repairs.
BMP Maintenance Records
The SWMP must include site inspection and maintenance records describing maintenance of
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BMP's that arc found to no longer function as designed or have proven inadequate.
RECORD RETENTION, MONITORING, NOTIFICATIONS AND FINAL STABILIZATION
Retention of Records
The permittee shall retain copies of the SWMP and all reports required by this permit and records
of all data used to complete the application to be covered by the permit for a period of three (3)
years after expiration or inactivation of permit coverage.
Monitoring
The CDHPE Water Quality Control Division reserves the right to require water quality sampling
and testing on a case by case basis.
Final Stabilization
Final stabilization shall be achieved by installation of permanent erosion control methods.
Permanent erosion control for this project shall include one or more of the following methods.
• Paving
• Landscaping
• Establishing dry land vegetation
• Placing riprap
Final stabilization shall be considered complete when a uniform vegetative cover has been
established with a density of at least 70% of the pre -disturbance cover exists or equivalent
permanent, physical erosion reduction methods have been employed.
Refer to the plans, notes, details and County Criteria for the appropriate seed mix, installation
methods and sediment control methods to achieve final stabilization.
Notifications
The CDHPE Water Quality Control Division shall be notified for the following items.
• Amendment of the Permit Certification. Amendments to the permit shall be in writing noting
changes to the to the information provided in the permit application, including legal contact,
the project legal description or map originally submitted with the application, or the planned
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total disturbed acreage.
• Non-compliance Notification. The permitter shall notify the Division at 1-877-518-5608
within twenty-four (24) hours to report the following instances of non-compliance.
I. Any non-compliance which may endanger the health of the environment.
2. Any spill or discharges of hazardous substances or chemicals to the waters of the
state.
3. Any discharge of stormwater which may exceed the water quality standard.
The CDHPE Water Quality Control Division reserves the right to require water quality sampling
and testing on a case by case basis.
CALCULATIONS
Refer to the Structural BMP's sizing calculations in the Appendix of this report.
REFERENCES
I. Weld County Storm Drainage Design and Technical Criteria. Weld County, Colorado
2. Urban Storm Drainage Criteria Manual, Urban Drainage and Flood Control District (latest edition).
3. FEMA FIRM Flood Insurance Rate Map Map No 0802660100O
4. Soil Survey of the Weld County, Colorado, US Department of Agriculture.
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APPENDIX
VICINITY MAP
SOILS MAP
CALCULATIONS
EROSION AND SEDIMENT CONTROL PLANS AND DETAILS
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VICINITY MAP
SITE LOCATION: SECTION 21, T,10N., R.58W. of the 6th P.M.
COUNTY OF WELD, STATE OF COLORADO
0
NO SCALE
WHITING PETROLEUM CORPORATION
REDTAIL GAS PLANT
Diamondback
Engineering & Surveying, Inc.
12640 West Cedar Drive, Suite C,
Lakewood, CO 80228-2030
Office: 303-985-4204
Fax: 303-985-4214
www.dlamondbackeng.com
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Map Unit Legend
Weld County, Colorado, Northern Part
(C0617)
Map Unit Map Unit Name Acres in Percent of
Symbol AOI AOI
K Nit_'rei
ccnsle.c, C to E
ce ref. _.00ns
17 7
Totals for Area of interest 33.0
100.0%
Li_S•.J p J !. - .•]IW A Scale
- Warning: Soil Map may not be valid at this scale.
you have zooned in beyond the scale at Much the soil map for this area is intendedto be used. Ma pi
surveys that comprise your A01 were mapped at 1:24,000 -The design of map units and the level of di
dependent on that map scale,
Enlargement of maps beyond the scale of napping can cause misunderstanding of the detail of mappir
do not show the small areas of contrasting soils that could have been shown at a more detailed Yale,
Fl cn sure
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segment, then dick once to defne the end of eadr segment. To finish, double-click ;or CTRL -click; the Last
point. To remove the current pplyllne and start over, press the Escape (ESC) key.
As you define each segment, the length d that segment and the cumulative length so far are displayed in
this panel. When you fin sh the polyp ne, the bngth of the fnal segment and the total length are displayed.
This tool is currently reporting measirements in feet or miles. To report in meters or kilometers, cl-ck the
Use Meters/Kilometers button.
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Search Map — Hydrologic Soil Group
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501 011Cm:.ca'i Prmedies
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055HTo Group C'assifiration 'Surface,
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Depth to Any Soil Restrictive Layer
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maps do not shos the small areas of contrasting soils that could have been shown at a more detailed
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View Description I View Rating segment, then click once to def:ne the end of each segment. To finish, double-click ' or CTRL -click` the
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xlli
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cc Sml assf_ation 51:'
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Tables — Hydrologic Soil Group — Summary By Map Unit
Summary by Map Unit — Weld County, Colorado, Northern Part (C0617)
Map unit symbol Map unit name
rl-Elie nell come _s, 9 to
o ;errant sores
32 e eukrittneil ecreptes, 5 s
9 percent lcces
Totals for Area of Interest
Rating Acres in AOI Percent of A01
Description — Hydrologic Soil Group
15.3
33.0
53 3,4,
455 ,o
100.0°/0
If
Imp:..websoilsurvev.nres.usda.godapp:WebSoilSurcey.aspx 3/8/2013
\V'eb Soil Survey
Page 2 of?
Hydrologic so I groups are based on estimates of runoff potential Soils are assigned to one of four
groups according to the rate or Aare, infitratior rfen the soils are not protected by vegetator, are
tnoro.:ghy -:etand rerewe preci pitatior from long -duration storms.
The soils in the Unted Oates are assigned to far groups CA. B. C. and Dl and three dual classes IND
BID, and C,DC The groups .re defined as follows:
Group A. Soils having a high Fl ato to (low undf potenCa) when thoroughly wet. These consist
mainly of deep well reamed toexcessively drained sands cr grave -.y sands. These sods have a high rate
of water transtransra seon.
Group B. Soils ha'oing a moderate - f It a[ on rate when thou ghly wet These consist chreffe of
moderately deep or deep, moderately wel drained or well drained soils that have moderately fine texture
to moderately coarse texture. These sods have a moderate rate of water transmission.
I Group C. Soils having a slow infiltration rate when thoraghly wet, These consist chiefly of soils having a
layer that lnpedes the downward movement of water or soils or moderately fee texture a' fine texture.
These soils have a slow rate of weer transmission.
Group D. Soils having a very slow rnfilt ration rate {high runoff potential; when thoroughly wet. These
consist chefly of clays that have a high shrink -swell potential, sods that have a high water table. soils
• that have a claypan a' c'ay layer at or near the surface, and soils that are shallow over nearly
impervious material. These soils have a very Sow rate or water transmiss-on.
If a soil is assigned to a dual hydrolog. c group (ND, B/D, or G0;, the frst letter is for drained areas and
the second is for u id rained areas Only the soils that in their natura, condition are in group D are
assigned to dual classes.
Rating Options — Hydrologic Soil Group
Aggregation Method: Dominant Cond tior
Component Percent Cutoff: '.Oc Specified
Tie -break Rule: HIGHT-
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"websoilsurvev.nres.usda.gov/app,WebSoilSurvey.aspx 3/8/2013
Whiting Red Tail Gas Plant
3/15/2013
By; JDE
Total Site Area =
Disturbed Surface Area=
Existing Surface =
Existing Perviousness =
Developed Area Surfacing
Developed Area Perviousness =
Total Site Perviousness
Total Site Area
Developed Area
Undeveloped Area =
40.00 Acres
1,742,400 SF
5.66 Acres
248,298 SF
Agricultural Land
2%
Road Base
40%
40 Acres
5.66 Acres
34.34 Acres
Diamondback
Engineering & Surveying
....ai.monee.n.ny..om
Total Perviousness = [(Developed Area / Total Area)*40%] + [(Undeveloped Area / Total Area)*2%]
Total Developed Site
Perviousness =
[(5.66/40)*0.4]+[(34.34/40)*0.02)] = 7.4% Pervious
Whiting Red Tail
Water Quality Pond Sizing
3/15/2013
By; JDE
Diamondback
Engineering 6 Surveying
.ec.venterm Dn'e c.
www m.mondb.aoy.com
Water Quality Volume =
(100 -year Detention Volume Plus WQCV) - (100 -year Detention Volume Including WQCV)
Detention Volume Plus WQCV =
Detention Volume Including WQCV =
Water Quality Capture Volume = 0.50-4.04 =
Water Quality Capture Volume =
0.50 Acre -Feet
0.40 Acre -Feet
0.10 Acre -Feet
4356 Cubic Feet
DETENTION VOLUME BY THE FULL SPECTRUM METHOD
Project: Whiting Red Tail
Basin ID:
Runoff Voume - Inches
2 50
2 00
1 50 •
1 CO •
C 50
CCC
0
Area of Watershed (acres)
Subwatershed Imperviousness
Level of Minimizing Directly Connected
Impervious Area (MDCIA)
Effective Imperviousness'
Hydrologic Soil Type
Type A
Type B
Type C or D
Excess Urban Runoff Volume°
100 -year Detention Volume plus WQCV s
5.66
40.0%
* User input data
shown in blue.
0
40.0%
Percentage of Area
Area (acres)
00
100.0%
5.7
0.0
Recommended Horton's Equation Parameters for CUHP
Infiltration (inches per hour)
Decay
Coefficient --m
Initial --f, Final fo
4.5 0.6
0.0018
Detention Volumes 2.5
Maximum Allowable
Release Rate, cfs3
(watershed inches)
(acre-feet)
0 51
0.24
Design Oulet to Empty
EURV in 72 Hours
1.05
0.50
4.81
2C
40 60
80
Percent Total Imperviousness
100
I
Notes:
1) Effective imperviousness is based on Figure ND -1 of the Urban Storm Drainage Criteria Manual (USDCM).
2) Results shown reflect runoff reduction from Level 1 or 2 MDCIA and are plotted at the watershed's total imperviousness value. the impact
of MDCIA is reflected by the results being below the curves.
3) Maximum allowable release rates for 100 -year event are based on Table SO -1. Outlet for the Excess Urban Runoff Volume (EURV) to be
designed to empty out the EURV in 72 hours. Outlet design is similar to one for the WQCV outlet of an extended detention basin (i.e..
perforated plate with a micro -pool) and extends to top of EURV water surface elevation.
4) EURV approximates the difference between developed and pre -developed runoff volume.
5) User has opted to add the WQCV to the 100 -year detention volume to satisfy local regulations. This is not required per the USDCM.
UD-Detention_v2. 31 xIs 3/15/2013, 1023 AM
DETENTION VOLUME BY THE FULL SPECTRUM METHOD
Project: Whiting Red Tail
Basin ID:
Runoff Voume - Inches
2 50
200
1 5C
1 ca
050
Area of Watershed (acres)
Subwatershed Imperviousness
Level of Minimizing Directly Connected
Impervious Area (MDCIA)
Effective Imperviousness'
Hydrologic Soil Type
Type A
Type B
Type C or D
Excess Urban Runoff Volume4
100 -year Detention Volume Including WOCV s
5.66
J
40.0 %
' User input data
shown in blue.
0
0
40 0%
Percentage of Area
Area (acres)
0.0%
0.0
100.0%
5 7
00%
0.0
Recommended Horton's Equation Parameters for CUHP
Infiltration (inches per hour)
Decay
Coefficient --a
Initial --f, Final--jo
4.5 0.6
0.0018
Detention Volumes 2.5
Maximum Allowable
Release Rate, cfs3
(watershed inches)
(acre-feet)
0.51
0 24
Design Oulet to Empty
EURV in 72 Hours
0.85
0 40
4.81
20
40
60
80
Percent Total Imperviousness
1C0
4#
Notes:
1 I Effective imperviousness is based on Figure ND -1 of the Urban Storm Drainage Criteria Manual (USDCM).
21 Results shown reflect runoff reduction from Level 1 or 2 MDCIA and are plotted at the watershed's total imperviousness value: the impact
of MDCIA is reflected by the results being below the curves.
31 Maximum allowable release rates for 100 -year event are based on Table SO -1. Outlet for the Excess Urban Runoff Volume (EURV) to be
designed to empty out the EURV in 72 hours. Outlet design is similar to one for the WOCV outlet of an extended detention basin (ie.,
perforated plate with a micro -pool) and extends to top of EURV water surface elevation.
4) EURV approximates the difference between developed and pre -developed runoff volume.
51100-yr detention volume includes EURV. No need to add more volume for WOCV or EURV
UD-Detention_v2. 31. xIs 3/8/2013, 3.57 PM
Temporary and Permanent Seeding (TS/PS) EC -2
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, gcotcxtilcs,
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.
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of
I )ouelas County.
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 Rervge/a/ion 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 hydrosecding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot
wading 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
November 20 I0 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
TS/PS-I
EC -2 Temporary and Permanent Seeding (TS/PS)
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 rcvcgetatcd 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 arca is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately resprcad across
areas that will be rcvcgetatcd.
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 finn, 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 arca arc listed in Table TS/PS-1 . These arc 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 Resegetation
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 sccd 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 rabbitbntsh (('hn'sothamnn.c
nauseosus), fourwing saltbush (Alriplev c(71nescens) and skunkbrush sumac (Rims ti//obata) could be
added to the upland secdmixes at 0.25, 0.5 and I pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus arnericana), woods rose (Rosa wooden),
plains cottonwood (Poplins sargenifi), and willow (Paptdns App.) may be considered. On non-topsoiled
upland sites, a legume such as Ladak alfalfa at I pound PLS/acre can be included as a source of nitrogen
for perennial grasses.
TS/PS-2
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) EC -2
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. Sec Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Species'
(Common name)
Growth
h
Season
Pounds of
Pure Live Seed
(PLS)/acre
Planting
Depth
(inches)
I . Oats
Cool
35 - 50
1 - 2
2. Spring wheat
Cool
25 - 35
1 - 2
3. Spring barley
Cool
25 - 35
1 - 2
4. Annual ryegrrass
Cool
10 - 15
L
5. Millet
Warm
3 - 15
L-'/4
6. Sudangrass
Warm
5-10
% - 3A
7. Sorghum
Warm
5-10
/ - 3/4
8. Winter wheat
Cool
20-35
1 - 2
9. Winter barley
Cool
20-35
I - 2
10. Winter rye
Cool
20-35
1 - 2
11. Triticale
Cool
25-40
1 - 2
" 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 arc
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.
I' See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied,
may extend the use of cool season species during the summer months.
' Seeding rates should be doubled if seed is broadcast, or increased by 50
percent if done using a Brillion Drill or by hydraulic seeding.
November 20 I0
Urban Drainage and Flood Control District TS/PS-3
Urban Storm Drainage Criteria Manual Volume 3
EC -2 Temporary and Permanent Seeding (TS/PS)
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Common''
Name
Botanical
Name
Growth
Season'
Growth
Form
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton
Spm'ubo/us uiruic/es
Cool
Bunch
1.750.000
025
Basin wildrye
Elytn tc cinereuc
Cool
Bunch
165,0(111
2.5
Sodar streambank whcatgrass
:Igrnprron riparillnl'Sndar'
Cool
Sod
I71),(10U
2.5
Jose (all wheat grass
.lgropl'1'Un elongate'', :lose'
Cool
Bunch
79.000
7.0
Alriba western whealgrass
rig/up-trill? SHIM] ii '.-Irribo'
Cool
Sod
110,000
5.5
Total
17.75
Fertile Loamy Soil Seed Mix
Lphriam crested 'hi.ILrass
.-lgrnprrot criclanun
7lphrimn'
Cool Sod 175,000 2.0
Dural hard Fescue
Fesaueu mono 'drn'iuccla°'
Cool
Bunch
565,000
1,0
Lincoln smooth bionic
/iron ox Inc'l'llll.T /CUSS
',
'Lincoln'
Cool
Sod
130,000
3.0
Sodar streambank wheat gross
.-tgrnprrun ripariuin 'S'ndar'
Cool
Sod
170,(1(111
2.5
Aniba western wheat grass
.Igrnplrun .cnlidlii '.drribu'
Cool
Sod
110,(1(111
711
Total
15.5
High Water Table Soil Seed Mix
Meadow. litxtail
,-1/npeclu'uxpruleacic
Cool
Sod
900,000
0,5
Redtop
,Igramiv olbn
Warr
Open sod
000.000
(1 25
Reed canarygrass
/'ha/oris nnnx/inacen
Cool
Sod
68.0(111
0.5
Lincoln smooth brome
Bxnnme inernli.c /e'ce,v
1.inenln'
Cool
Sod
130,0011
3.0
Pathfinder swilchgrass
Paltcum rt'gunnu
Toth/index'
Warm
Sod
389,000
1.0
Alkar tall wheatgrass
,lgrnprrnn elongate'',Cool
':I/kur'
Bunch
79/11111
5.5
Total
10.75
Transition Turf Seed Mix'
Ruebens Canadian bluegrass
Pod cunlpressa Mechem'
Cool
Sod
2.500.000
0.5
Dural hard fescue
Pesmco Drina 'duriuscula'
Cool
Bunch
565,000
111
Citation perennial ryegrass
Lathan perete n' 'Citation'
Cool
Sod
247,000
3.11
_incoln
131bOn,s lilexllli.s !CUSS
smooth bronze Cool Sod 130,(1(10
'Lincoln'
3.11
Total
7.5
TS/PS-4
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) EC -2
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 erama
13omeloaa,,racil(s
WarmSod-tanning
bunehgR6s
S25O(10
0.5
Camper little bluestem
.\e11Ct i'lllai aehseo RIfull: l
1
't .al'. alp'
Warm
Bunch
240,000
1.0
Prairie sandreed
( alut?un'll/a iongnats
Warm
( )pen sod
274,000
1.t)
Sand dropseed
Sporn/0)/0s ('np(alu/ra9
Cool
launch
5.29 8 11011
(1.25
Vaughn sideoats erumi
Bnruelnuu cur(ipradlll"
Warm
Sod
191,000
2.0
Arriba western wheatgrass
Agroprran slnifhii 'Anita'
Cool
Sod
110,001)
5.5
Total
10.25
Heavy Clay, Rocky Foothill Seed Mix
Lphriam crested wheaturassd
el,Kroprroll cri.vlafom
7:phrialn'
Cool
Sod
175,000
15
Oahe Intermediate wheatgrass;Igruprrun
inlrrnreclionl
'Oahe'
Cool
Sod
115,001)
55
Vaughn sideoats grams`
Boweluo curlipea`la/o
'I imghn'
Warm
Sod
191 000
2_0
Lincoln smooth brome
animus WOWS 'CUSS
'Lincoln'
Sod
130,001)
3.11
Aniba western wheatgrass
Agroprron snliihii '.drribu'
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 Lumped hay or straw mulch. I hese rates
should be doubled if seed is broad ast and should be increased by 50 percent if the seeding is dill e using a Brill on Drill or is
applied through hydraulic seeding. Hydraulic seeding may be sill slit tiled her drilling only where slopes are Mice ter than 3:1.
If hydraulic seeding is used. hydra ilic mulching should be done as a separate operation.
I' See -Fable TS'PS-3 for seeding dates.
' If site is to he irrigated, the transit in turf seed rates should be doubled.
`I Crested wheatgrass should not he used on slopes steeper than III to IV.
' Can substitute 0.5 lbs PI 5 111 binc granla for the 2.0 lbs PLS of Vaughn sideoais crania_
November 20 ICI
Urban Drainage and Flood Control District TS/PS-5
Urban Storm Drainage Criteria Manual Volume 3
EC -2 Temporary and Permanent Seeding (TS/PS)
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
I.2.3
✓
✓
May I —May IS
4
✓
May I6 —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
I
October 1 —December 31
✓
V
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.
TS/PS-6
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Mulching (MU)
EC -4
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 tackificr.
Appropriate Uses
Photograph MU -1. An area that was recently seeded. mulched.
and crimped_
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 arc 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
Ycs
Sediment Control
Moderate
Site/Material Management
No
November 20 I0 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
MU -I
EC -4 Mulching (MU)
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 arc 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 tackificr 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
tackificr) 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.
MU -2
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP)
Description
Rolled Erosion Control Products
(RECPs) include a variety of
temporary or permanently installed
manufactured products designed to
control erosion and enhance vegetation
establishment and survivability,
particularly on slopes and in channels.
For applications where natural
vegetation alone will provide sufficient
permanent erosion protection,
temporary products such as netting,
open weave textiles and a variety of
erosion control blankets (ECBs) made
of biodegradable natural materials
EC -6
^iiw
iskeTN.I.cf• •
Photograph RECP-1. I rosion control blanket protecting the slope front
(e.g., straw, coconut fiber) can be used. erosion and providing favorable conditions for revegetation.
For applications where natural
vegetation alone will not be sustainable under expected flow conditions, permanent rolled erosion control
products such as turf reinforcement mats (TRMs) can be used. In particular, turf reinforcement mats arc
designed for discharges that exert velocities and sheer stresses that exceed the typical limits of mature
natural vegetation.
Appropriate Uses
RECPs can be used to control erosion in conjunction with revegetation efforts, providing seedbed
protection from wind and water erosion. These products are often used on disturbed areas on steep
slopes, in areas with highly erosive soils, or as part of drainageway stabilization. In order to select the
appropriate RECP for site conditions, it is important to have a general understanding of the general types
of these products, their expected longevity, and general characteristics.
The Erosion Control Technology Council (ECTC 2005) characterizes rolled erosion control products
according to these categories:
• Mulch control netting: A planar woven natural fiber or extruded geosynthetic mesh used as a
temporary degradable rolled erosion control product to anchor loose fiber mulches.
• Open weave textile: A temporary degradable rolled erosion control product composed of processed
natural or polymer yarns woven into a matrix, used to provide erosion control and facilitate
vegetation establishment.
• Erosion control blanket (ECB): A temporary
degradable rolled erosion control product composed of
processed natural or polymer fibers which arc
mechanically, structurally or chemically bound together
to form a continuous matrix to provide erosion control
and facilitate vegetation establishment. ECBs can be
further differentiated into rapidly degrading single -net
and double -net types or slowly degrading types.
Rolled Erosion Control Products
Functions
Erosion Control
Yes
Sediment Control
No
Site/Material Management
No
November 2010 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
RECP-I
EC -6 Rolled Erosion Control Products (RECP)
Turf Reinforcement Mat (TRM): A rolled erosion control product composed of non -degradable
synthetic fibers, filaments, nets, wire mesh, andor other elements, processed into a permanent, three-
dimensional matrix of sufficient thickness. TRMs, which may be supplemented with degradable
components, arc designed to impart immediate erosion protection, enhance vegetation establishment
and provide long-term functionality by permanently reinforcing vegetation during and after
maturation. Note: TRMs arc typically used in hydraulic applications, such as high flow ditches and
channels, steep slopes, stream banks, and shorelines, where erosive forces may exceed the limits of
natural, unreinforccd vegetation or in areas where limited vegetation establishment is anticipated.
Tables RECP-1 and RECP-2 provide guidelines for selecting rolled erosion control products appropriate
to site conditions and desired longevity. Table RECP-1 is for conditions where natural vegetation alone
will provide permanent erosion control, whereas Table RECP-2 is for conditions where vegetation alone
will not be adequately stable to provide long-term erosion protection due to flow or other conditions.
RECP-2
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC -6
Table RECP-l. ECTC Standard Specification for Temporary Rolled Erosion Control Products
(Adapted from Erosion Control Technology Council 2005)
Product Description
Slope
Applications*
Channel
Applications*
Minimum
Tensile
Strength'
Expected
Longevity
Maximum
Gradient
C Factor '
Max. Shear
Stress
Mulch Control Nets
5:1 (H:V)
<0.10 (a:
5:1
0.25 lbs/ft2
( l2 Pa)
5 lbs/ft
(0.073 kN/m)
Up to 12
months
Netless Rolled
Erosion Control
Blankets
4:1 (H:V)
<0.1() (a
4:1
0.5 lbs/ft-
(24 Pa)
5 lbs/ft
(0.073 kN/m)
Single -net Erosion
Control Blankets & 3:1 (H:V)
Open Weave Textiles
<0.15 tit
3:1
1.5 lbs/ft-
(72 Pa)
50 lbs/ft
((1.73 kN/m)
Double -net Erosion
Control Blankets 2.1 (H.V)
<0.70 (a
2:1
1.75 lbs/ft-
(54 Pa)
75 lbs/ft
(1.09 kN/m)
Mulch Control Nets
5:1 (ITV)
<0.10 (a:
5: I
0.25 lbs/ft2
(12 Pa)
25 lbs/ft
(0.36 kN/m)
24 months
i
Erosion Control
Blankets & Open
Weave Textiles
(slowly degrading)
1.5:1 (H:V)
<0.25 (a
1.5:1
2.00 lbs/fr
(96 Pa)
100 lbs/ft
(1.45 kN/m)
24 months
Erosion Control
Blankets & Open
Weave Textiles
1:1 (H:V)
41,25 a
1:1
2.25 lbs/ft-
(108 Pa)
125 lbs/ft
(1.82 kN/m)
36 months
* C Factor and shear stress for mulch control nettings must be obtained with netting used in conjunction
with pre -applied mulch material. (See Section 5.3 of Chapter 7 (instruction B,14Ps for more in!orn ation
on the C {actor.)
Minimum Average Roll Values, Machine direction using ECTC Mod. ASTM D 5035.
C Factor calculated as ratio of soil loss from RECP protected slope (tested at specified or greater
gradient, H:V) to ratio of soil loss from unprotected (control) plot in large-scale testing.
Required minimum shear stress RECP (unvegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in) soil loss) during a 30 -minute flow event in large-scale testing.
' The permissible shear stress levels established for each performance category arc based on historical
experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05.
Acceptable large-scale test methods may include ASTM D 6459, or other independent testing deemed
acceptable by the engineer.
° Per the engineer's discretion. Recommended acceptable large-scale testing protocol may include ASTM
D 6460, or other independent testing deemed acceptable by the engineer.
November 20 I 0
Urban Drainage and Flood Control District RECP-3
Urban Storm Drainage Criteria Manual Volume 3
EC -6 Rolled Erosion Control Products (RECP)
Table RECP-2. ECTC Standard Specification for Permanent' Rolled Erosion Control Products
(Adapted from: Erosion Control Technology Council 2005)
Product Type
Slope
Applications
Channel Applications
TRMs with a minimum thickness of
0.25 inches (6.35 mm) per ASTM D
• 6525 and UV stability of 80% per
ASTM D 4355 (500 hours
exposure).
Maximum
Gradient
0.5:1 (H:V)
Maximum
Shear Stress"
6.0 lbs/ft2 (288 Pa)
Minimum
Tensile
Strength''
125 lbs/ft (1.82
kN/m)
11.5: I (H:V)
8.0 lbs/ft2 (384 Pa)
150 Ibs/ft (2.19
kN/m)
0.5:1 (H:V)
10.0 lbs/ft2 (480 Pa)
175 lbs/ft (2.55
kN/m)
For TRMs containing degradable components, all property values must be obtained on the non-
degradable portion of the matting alone.
2 Minimum Average Roll Values, machine direction only for tensile strength determination using .AST\1
I) 681 (Supersedes Mod. .A [\1 I) 5035 for RECPs)
Field conditions with high loading and/or high survivability requirements may warrant the use of a TRM
with a tensile strength of 44 kN/m (3,000 lb/f0 or greater.
' Required minimum shear stress TRM (fully vegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in.) soil loss) during a 30 -minute flow event in large scale testing.
Acceptable large-scale testing protocols may include :ASTM D 6460, or other independent testing
deemed acceptable by the engineer.
Design and Installation
RECPs should be installed according to manufacturer's specifications and guidelines. Regardless of the
type of product used, it is important to ensure no gaps or voids exist under the material and that all
corners of the material arc secured using stakes and trenching. Continuous contact between the product
and the soil is necessary to avoid failure. Never use metal stakes to secure temporary erosion control
products. Often wooden stakes arc used to anchor RECPs; however, wood stakes may present installation
and maintenance challenges and generally take a long time to biodegrade. Some local jurisdictions have
had favorable experiences using biodegradable stakes.
This BMP Fact Sheet provides design details for several commonly used ECB applications, including:
ECB-1 Pipe Outlet to Drainageway
ECB-2 Small Ditch or Drainageway
ECB-3 Outside of Drainageway
RECP-4
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC -6
Staking patterns arc also provided in the design details according to these factors:
• ECB type
• Slope or channel type
For other types of RECPs including TRMs, these design details arc intended to serve as general
guidelines for design and installation; however, engineers should adhere to manufacturer's installation
recommendations.
Maintenance and Removal
Inspection of erosion control blankets and other RECPs includes:
Check for general signs of erosion, including voids beneath the mat. If voids arc apparent, fill the
void with suitable soil and replace the erosion control blanket, following the appropriate staking
pattern.
Check for damaged or loose stakes and secure loose portions of the blanket.
Erosion control blankets and other RECPs that arc biodegradable typically do not need to be removed
after construction. If they must be removed, then an alternate soil stabilization method should be installed
promptly following removal.
Turf reinforcement mats, although generally resistant to biodegradation, arc typically left in place as a
dense vegetated cover grows in through the mat matrix. The turf reinforcement mat provides long-term
stability and helps the established vegetation resist erosive forces.
November 20 I0
Urban Drainage and Flood Control District RECP-5
Urban Storm Drainage Criteria Manual Volume 3
EC -6 Rolled Erosion Control Products (RECP)
UNDISTURBED
SOIL
PERIMETER
ANCHOR
TRENCH, TYP.
JOINT ANCHOR
TRENCH, TYP.
TYPE OF ECU AS INDICATED IN PLAN VIEW. INSTALL IN ALL
DISTURBED AREAS OF STREAMS AND DRAINAGE CHANNELS TO DEPTH
D ABOVE CHANNEL INVERT. ECB SHALL GENERALLY BE ORIENTED
PARALLEL TO FLOW DIRECTION (I. E. LONG DIMENSIONS OF BLANKET
PARALLEL TO ELOWLINES) STAKING PATTERN SHALL MATCH ECB
AND/OR CHANNEL TYPE.
TOP OF
CHANNEL BANK
ECB-1. PIPE OUTLET TO DRAINAGEWAY
JOINT ANCHOR
TRENCH, TYP.
6"
TOPSOIL
TYPE OF ECB,
INDICATED IN PLAN VIEW
ECB SHALL
EXTEND TO THE
TOP OF THE
CHANNEL
PERIMETER ANCHOR
TRENCH. TYP.
COMPACTED
SU BG RADE
STAKING PATTERN PER MANUFACTURER SPEC. OR PATTERN
BASED ON ECB AND/OR CHANNEL TYPE (SEE STAKING
PATTERN DETAIL)
ECB-2. SMALL DITCH OR DRAINAGEWAY
ANCHOR DETAILS
GEOTEX
FABRIC
-I
TILE
OR MAT, TYP.
- 3" MIN, TYP
6 MIN,
TYP.
COMPACTED
BACKFILL,
PERIMETER
`"- SINGLE EDGE
'I` STAKE, TYP.
TYP.
ANCHOR TRENCH
JOINT
ANCHOR
TWO EDGES
OF TWO
ADJACENT
ROLLS
TRENCH
INTERMEDIATE
LOOP FROM
MIDDLE OF
ROLL
ANCHOR TRENCH
FLOW
OVERLAPPING
JOINT
1 2"
MIN.
WOOD
--I
STAKE
I- 3" MIN.
DETAIL
RECP-6 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2000
Rolled Erosion Control Products (RECP) EC -6
STAGGER OVERLAPS
DIVERSION DITCH
TYPICALLY AT TOP OF
SLOPE
PERIMETER
ANCHOR
TRENCH OR
JOINT, TYP.
STRAW
4,1-3.1
SLOPES
ECB-3.
OVERLAPPING JOINT
STAKING PATTERN PER
MANUFACTURER SPEC. OR PATTERN
BASED ON ECB AND/OR SLOPE
TYPE (SEE STAKING PATTERN DETAIL)
PERIMETER ANCHOR
TRENCH
OUTSIDE OF DRAINAGEWAY
ROLL
WIDTH
W, TYP.
Y2W
0 0
- Yz W
0 0
2
STRAW -COCONUT COCONUT OR EXCELSIOR
STAKING PATTERNS BY ECB TYPE
3
6' -
--I I- 3/2 W
0
o Y2 0
W— - Y2 W
3,1 -2.1
SLOPES
W
0
0 0
0
2.1 AND STEEPER
SLOPES
Yz W
2'
LOW FLOW CHANNEL HIGH FLOW CHANNEL
STAKING PATTERNS BY SLOPE OR CHANNEL TYPE
November 20 I0
Urban Drainage and Flood Control District RECP-7
Urban Storm Drainage Criteria Manual Volume 3
EC -6 Rolled Erosion Control Products (RECP)
EROSION CONTROL RI ANKFT INSTAL I ATION NOTES
1. SEE PLAN VIEW FOR:
-LOCATION OF ECB.
- TYPE OF ECB (STRAW, STRAW -COCONUT, COCONUT. OR EXCELSIOR).
- AREA, A, IN SQUARE YARDS OF EACH TYPE OF ECB.
2. 100% NATURAL AND BIODEGRADABLE MATERIALS ARE PREFERRED FOR RECPs, ALTHOUGH
SOME JURISDICTIONS MAY ALLOW OTHER MATERIALS IN SOME APPLICATIONS.
3 IN AREAS WHERE EGOS ARE SHOWN ON THE PLANS, THE PERMITTEE SHALL PLACE
TOPSOIL AND PERFORM FINAL GRADING, SURFACE PREPARATION, AND SEEDING AND MULCHING.
SUBGRADE SHALL BE SMOOTH AND MOIST PRIOR TO EGO INSTALLATION AND THE ECB SHALL
BE IN FULL CONTACT WITH SUBGRADE. NO GAPS OR VOIDS SHALL EXIST UNDER THE
BLANKET.
4. PERIMETER ANCHOR TRENCH SHALL BE USED ALONG THE OUTSIDE PERIMETER OF ALL
BLANKET AREAS.
5 JOINT ANCHOR TRENCH SHALL BE USED TO JOIN ROLLS OF ECBs TOGETHER
(LONGITUDINALLY AND TRANSVERSELY) FOR ALL ECBs EXCEPT STRAW WHICH MAY USE
AN OVERLAPPING JOINT.
6 INTERMEDIATE ANCHOR TRENCH SHALL BE USED AT SPACING OF ONE-HALF ROLL LENGTH
FOR COCONUT AND EXCELSIOR ECBs.
7. OVERLAPPING JOINT DETAIL SHALL BE USED TO JOIN ROLLS OF ECBs TOGETHER FOR ECBs
ON SLOPES.
8. MATERIAL SPECIFICATIONS OF ECBs SHALL CONFORM TO TABLE ECB- 1.
9. ANY AREAS OF SEEDING AND MULCHING DISTURBED IN THE PROCESS OF INSTALLING EGOS
SHALL BE RESEEDED AND MULCHED.
10. DETAILS ON DESIGN PLANS FOR MAJOR DRAINAGEWAY STABILIZATION WILL GOVERN IF
DIFFERENT FROM THOSE SHOWN HERE.
TABLE ECB-1. ECB MATERIAL SPECIFICAT ONS
TYPE
COCONUT
CONTENT
STRAW
CONTENT
EXCELSIOR
CONTENT
RECOMMENDED
NETTING.*
STRAW
-
100%
-
DOUBLE/
NATURAL
STRAW—
COCONUT
30% MIN
70% MAX
_
DOUBLE/
NATURAL
COCONUT
100%
—
—
DOUBLE/
NATURAL
EXCELSIOR
_
_
100%
DOUBLE/
NATURAL
'STRAW ECBs MAY ONLY BE USED OUTSIDE OF STREAMS PND DRAINAGE CHANNEL.
•'ALTERNATE NETT NG MAY BE ACCEPTABLE IN SOME JURISDICTIONS
RECP-M
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP) EC -6
EROSION CONTROL RI ANKFT MAINTENANCE NOTES
1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION.
MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS
POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE
EROSION, AND PERFORM NECESSARY MAINTENANCE.
2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPS IN
EFFECTIVE OPERATING CONDITION INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMENTED THOROUGHLY,
3 WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON
DISCOVERY OF THE FAILURE.
4. ECBs SHALL BE LEFT IN PLACE TO EVENTUALLY BIODEGRADE, UNLESS REQUESTED TO BE
REMOVED BY THE LOCAL JURISDICTION.
5. ANY ECB PULLED OUT, TORN, OR OTHERWISE DAMAGED SHALL BE REPAIRED OR
REINSTALLED. ANY SUBGRADE AREAS BELOW THE GEOTEXTILE THAT HAVE ERODED TO CREATED
A VOID UNDER THE BLANKET, OR THAT REMAIN DEVOID OF GRASS SHALL BE REPAIRED,
RESEEDED AND MULCHED AND THE ECB REINSTALLED.
NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS.
CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN
DIFFERENCES ARE NOTED.
(DETAILS ADAPTED FROM DOUGLAS COUNTY, COLORADO AND TOWN OF PARKER COLORADO. NOT AVAILABLE IN AUTOCAD)
November 20 I tl
Urban Drainage and Flood Control District RECP-9
Urban Storm Drainage Criteria Manual Volume 3
Concrete Washout Area (CWA) MM -1
Description
Concrete waste management involves
designating and properly managing a
specific arca 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 arc 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
Photograph CWA-1. I sample of concrete washout area. Note gravel
tracking pad for access and sign.
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 arc
recommended to prevent an impact from unlined pits to groundwater:
• The use of the washout site should be temporary (less than I year), and
• The washout site should be not be located in an arca 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
November 20 I (I Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
CWA-I
courtesy of (U( )T.
MM -1 Concrete Washout Area (CWA)
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 arc 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 arca. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout arca is being used, as opposed to
washout in non -designated areas of the site.
Remove concrete waste in the washout arca, 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-2. Prefabricated concrete washout. Photo Photograph CWA-3. I'arthen concrete washout. Photo
courtesy of CI
CWA-2
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Concrete Washout Area (CWA) MM -1
12" TYP.
>4
CONCRETE WASHOUT AREA PLAN
UNDISTURBED OR
COMPACTED SOIL
>3
CONCRETE WASHOUT
L�SIGN
COMPACTED BERM AROUND
THE PERIMETER
I3' MIN. >311
8 X 8 MIN.
SECTION A
VEHICLE TRACKING
CONTROL (SEE
VTC DETAIL) OR
OTHER STABLE
SURFACE
2% SLOPE
VEHICLE TRACKING
CONTROL (SEE VTC -
DETAIL )
CWA-1. CONCRETE WASHOUT AREA
CWA INSTALLATION NOTES
1. SEE PLAN VIEW FOR:
-CWA INSTALLATION LOCATION.
2. DO NOT LOCATE AN UNLINED CWA WITHIN 400' OF ANY NATURAL DRAINAGE PATHWAY OR
WATERBODY. DO NOT LOCATE WITHIN 1,000' OF ANY WELLS OR DRINKING WATER SOURCES. IF
SITE CONSTRAINTS MAKE THIS INFEASIBLE, OR IF HIGHLY PERMEABLE SOILS EXIST ON SITE,
THE CWA MUST BE INSTALLED WITH AN IMPERMEABLE LINER (16 MIL MIN. THICKNESS) OR
SURFACE STORAGE ALTERNATIVES USING PREFABRICATED CONCRETE WASHOUT DEVICES OR A
LINED ABOVE GROUND STORAGE ARE SHOULD BE USED.
3. THE CWA SHALL BE INSTALLED PRIOR TO CONCRETE PLACEMENT ON SITE.
4. CWA SHALL INCLUDE A FLAT SUBSURFACE PIT THAT IS AT LEAST B. BY B' SLOPES
LEADING OUT OF THE SUBSURFACE PIT SHALL BE 3.1 OR FLATTER. THE PIT SHALL BE AT
LEAST 3' DEEP.
5 BERM SURROUNDING SIDES AND BACK OF THE CWA SHALL HAVE MINIMUM HEIGHT OF 1'.
6. VEHICLE TRACKING PAD SHALL BE SLOPED 2% TOWARDS THE CWA.
7 SIGNS SHALL BE PLACED AT THE CONSTRUCTION ENTRANCE, AT THE CWA, AND
ELSEWHERE AS NECESSARY TO CLEARLY INDICATE THE LOCATION OF THE CWA TO OPERATORS
OF CONCRETE TRUCKS AND PUMP RIGS.
8. USE EXCAVATED MATERIAL FOR PERIMETER BERM CONSTRUCTION.
November 20 I0
Urban Drainage and Flood Control District CWA-3
Urban Storm Drainage Criteria Manual Volume 3
MM -1 Concrete Washout Area (CWA)
CWA MAINTENANCE NOTES
1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION.
MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS
POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE
EROSION, AND PERFORM NECESSARY MAINTENANCE.
2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN
EFFECTIVE OPERATING CONDITION INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMENTED THOROUGHLY,
3 WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON
DISCOVERY OF THE FAILURE.
4. THE CWA SHALL BE REPAIRED, CLEANED, OR ENLARGED AS NECESSARY TO MAINTAIN
CAPACITY FOR CONCRETE WASTE. CONCRETE MATERIALS, ACCUMULATED IN PIT, SHALL BE
REMOVED ONCE THE MATERIALS HAVE REACHED A DEPTH OF 2..
5. CONCRETE WASHOUT WATER, WASTED PIECES OF CONCRETE AND ALL OTHER DEBRIS
IN THE SUBSURFACE PIT SHALL BE TRANSPORTED FROM THE JOB SITE IN A WATER - TIGHT
CONTAINER AND DISPOSED OF PROPERLY.
6 THE CWA SHALL REMAIN IN PLACE UNTIL ALL CONCRETE FOR THE PROJECT IS PLACED.
7 WHEN THE CWA IS REMOVED, COVER THE DISTURBED AREA WITH TOP SOIL, SEED AND
MULCH OR OTHERWISE STABILIZED IN A MANNER APPROVED BY THE LOCAL JURISDICTION.
(DETAIL ADAPTED FROM DOUGLAS COUNTY, COLORADO AND THE CITY OF PARKER, COLORADO, NOT AVAILABLE IN AUTOCAD).
NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS.
CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN
DIFFERENCES ARE NOTED.
CWA-4
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL)
SC -2
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 arc 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.
Photographs SCL-1 and SCL-2. Sediment control logs used as I ) a
perimeter control around a soil stockpile: and 2) as a"I-hook
perimeter control at the comer of a co 1stIncIion site.
Design and Installation
Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum
allowable tributary drainage area per 1011 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: I. 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
Ycs
Site/Material Management
No
November 2010 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
SCL-1
SC -2 Sediment Control Log (SCL)
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 arc impermeable.
Design details and notes for sediment control logs arc provided in Detail SCL-I. 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.
SCL-2
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL)
SC -2
1Y4 x 1Yi" x 18" (MIN)
WOODEN STAKE
9" DIAMETER (MIN)
SEDIMENT CONTROL LOG
---
Y3DIAM.
FLOW OF SCL
(TYP.)
SEDIMENT CONTROL LOG
COMPACTED EXCAVATED
TRENCH SOIL
FLOW
SECTION A
2" OVERLAP
(MIN.)
Co
9" DIAMETER (MIN)
SEDIMENT CONTROL LOG
NOTE- LARGER
DIAMETER SEDIMENT
CONTROL LOGS MAY
NEED TO BE
EMBEDDED DEEPER.
CENTER STAKE IN CONTROL LOC
9" DIAMETER (MIN)
SEDIMENT CONTROI LOG
Y3 DIAM. SCL (TYP.)
1 J�" x 11" x 18" (MIN)
WOODEN STAKE
SEDIMENT CONTROL LOG JOINTS
SCL-1. SEDIMENT CONTROL LOG
November 20 I (I
Urban Drainage and Flood Control District SCL-3
Urban Storm Drainage Criteria Manual Volume 3
SC -2 Sediment Control Log (SCL)
COMPACTED EXCAVA-ED
TRENCH SCI_
FLOW
1"
V
E MIN.
CEN-EP, STAKE IN CCNTRC_ LOG
9" DIAME"CR (E./ N)
SFr MFNT CON-RO. 1O.
PLACE _OG AGAINST BACK C= CURE
Y� DIAM. SC_ (-YP.)
SCL-2. SEDIMENT CONTROL LOG AT BACK OF CURB
CENTER STAKE
it IN CONTRC_ LOG
z., , 9" DIAMETER (VIN)
SEDIMENT CONTROL LOG
6"
MN.
Y., DIAM. SOL (T"P.;
F LOW
TREE LAWN ( 'YE CAL)
L PLACE CONTROL LOG
AGAINST SIOEWA_K
SIDEWALK
CURE
SCL-3. SEDIMENT CONTROL LOG AT SIDEWALK WITH
TREE LAWN
STAKING A" 4 MAX.
ON CFNIFR (TYP.)
I VERTICAL SPACING
VARIF S N .AG
I ON S_OPE
\ r:ON i l\,IOUs SOT
AT PER ME -ER C=
CONS -RUCTION SITE
SCL-4. SEDIMENT CONTROL LOGS TO CONTROL
SLOPE LENGTH
SCL-4
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Sediment Control Log (SCL) SC -2
SEDIMENT CONTROL 100 INSTAI I ATION NOTES
1. SEE PLAN VIEW FOR LOCATION AND LENGTH OF SEDIMENT CONTROL LOGS.
2 SEDIMENT CONTROL LOGS THAT ACT AS A PERIMETER CONTROL SHALL BE INSTALLED PRIOR
TO ANY UPGRADIENT LAND -DISTURBING ACTIVITIES.
3 SEDIMENT CONTROL LOGS SHALL CONSIST OF STRAW, COMPOST, EXCELSIOR OR COCONUT
FIBER, AND SHALL BE FREE OF ANY NOXIOUS WEED SEEDS OR DEFECTS INCLUDING RIPS,
HOLES AND OBVIOUS WEAR
4. SEDIMENT CONTROL LOGS MAY BE USED AS SMALL CHECK DAMS IN DITCHES AND SWALES.
HOWEVER. THEY SHOULD NOT BE USED IN PERENNIAL STREAMS OR HIGH VELOCITY DRAINAGE
WAYS.
5 IT IS RECOMMENDED THAT SEDIMENT CONTROL LOGS BE TRENCHED INTO THE GROUND TO
A DEPTH OF APPROXIMATELY Y,T OF THE DIAMETER OF THE LOG. IF TRENCHING TO THIS
DEPTH IS NOT FEASIBLE AND/OR DESIRABLE (SHORT TERM INSTALLATION WITH DESIRE NOT TO
DAMAGE LANDSCAPE) A LESSER TRENCHING DEPTH MAY BE ACCEPTABLE WITH MORE ROBUST
STAKING
6 THE UPHILL SIDE OF THE SEDIMENT CONTROL LOG SHALL BE BACKEILLED WITH SOIL THAT
IS FREE OF ROCKS AND DEBRIS. THE SOIL SHALL BE TIGHTLY COMPACTED INTO THE SHAPE
OF A RIGHT TRIANGLE USING A SHOVEL OR WEIGHTED LAWN ROLLER.
7 FOLLOW MANUFACTURERS' GUIDANCE FOR STAKING. IF MANUFACTURERS' INSTRUCTIONS
DO NOT SPECIFY SPACING. STAKES SHALL BE PLACED ON 4' CENTERS AND EMBEDDED A
MINIMUM OF 6" INTO THE GROUND. 3" OF THE STAKE SHALL PROTRUDE FROM THE TOP OF
THE LOG. STAKES THAT ARE BROKEN PRIOR TO INSTALLATION SHALL BE REPLACED.
SEDIMENT CONTROL IOG MAINTENANCE NOTES
1 INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION.
MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS
POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE
EROSION, AND PERFORM NECESSARY MAINTENANCE.
2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN
EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMENTED THOROUGHLY.
3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON
DISCOVERY OF THE FAILURE.
4. SEDIMENT ACCUMULATED UPSTREAM OF SEDIMENT CONTROL LOG SHALL BE REMOVED AS
NEEDED TO MAINTAIN FUNCTIONALITY OF THE BMP, TYPICALLY WHEN DEPTH OF ACCUMULATED
SEDIMENTS IS APPROXIMATELY )5 OF THE HEIGHT OF THE SEDIMENT CONTROL LOG.
5. SEDIMENT CONTROL LOG SHALL BE REMOVED AT THE END OF CONSTRUCTION. IF
DISTURBED AREAS EXIST AFTER REMOVAL, THEY SHALL BE COVERED WITH TOP SOIL, SEEDED
AND MULCHED OR OTHERWISE STABILIZED IN A MANNER APPROVED BY THE LOCAL
JURISDICTION.
(DETAILS ADAPTED FROM TOWN OF PARKER. COLORADO. JEFFERSON COUNTY, COLORADO, DOUGLAS COUNTY. COLORADO,
AND CITY OF AURORA, COLORADO, NOT AVAILABLE IN AUTOCAD)
NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS.
CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN
DIFFERENCES ARE NOTED.
November 20 I tl
Urban Drainage and Flood Control District SCL-5
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC)
SM-4
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:
Photograph ITC -I. A vehicle tracking control pad constricted with
properly siied rock reduces off -site sediment tracking.
• 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 arc 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 arc 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
November 20 I0 Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
VTC-I
SM-4 Vehicle Tracking Control (VTC)
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 arc 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.
Photograph VTC-2. A vehicle tracking control pad with wheel wash
fitcility- Photo courtcsv of Torn Gore_
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.
VTC-2
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC)
SM-4
SIDEWALK OR OTHER
PAVED SURFACE
PUBLIC
ROADWAY
INSTALL ROCK FLUSH WITH
OR BELOW TOP OF PAVEMENT
COMPACTED SUBGRADE
50 FOOT (MIN.)
20 FOOT
(WIDTH CAN BE
LESS IF CONST.
VEHICLES ARE
PHYSICALLY
CONFINED ON
BOTH SIDES)
9" (MIN )
UNLESS OTHERWISE SPECIFIED
BY LOCAL JURISDICTION, USE
CDOT SECT. #703. AASHTO #3
COARSE AGGREGATE OR 6"
MINUS ROCK
NON -WOVEN GEOTEXTILE FABRIC
BETWEEN SOIL AND ROCK
UNLESS OTHERWISE SPECIFIED BY LOCAL
JURISDICTION, USE CDOT SECT. #703, AASHTO
#3 COARSE AGGREGATE
OR 6" MINUS ROCK r 9" (MIN.)
SECTION A
NON -WOVEN GEOTEXTILE
FABRIC
VTC-1. AGGREGATE VEHICLE TRACKING CONTROL
November 20 I0
Urban Drainage and Flood Control District VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4
Vehicle Tracking Control (VTC)
PUBLIC
ROADWAY
NOTE: WASH WATER
MAY NOT CONTAIN
CHEMICALS OR SOAPS
WITHOUT OBTAINING
A SEPARATE PERMIT
DITCH TO CARRY
WASH WATER TO
SEDIMENT TRAP
OR BASIN
WASH RACK
6'7" MIN
REINFORCED CONCRETE RACK__
(MAY SUBSTITUTE STEEL CATTLE
GUARD FOR CONCRETE RACK)
DRAIN SPACE
SECTION A
VTC-2. AGGREGATE VEHICLE TRACKING CONTROL WITH
WASH RACK
VTC-4
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC) SM-4
EXISTING
PAVED
ROADWAY
18" MIN
OCO
e4'
`LO,L\O SS \ TRM END OVERLAP WITH
J4:1 e ,1�.,,0 SPIKES OR STAKES
O \ G \ CONSTRUCTION MATS, WOVEN
c o d.Q(<,‘' OR TURF REINFORCEMENT STRAP
C'�E,o,�� MAT (TRM) CONNECTORS
4
DISTURBED AREA,
CONSTRUCTION SITE.
STABILIZED STORAGE AREA
OR STAGING AREA
SPIKES OR
STAKES
RESTRICT CONST. VEHICLE
ACCESS TO SIDES OF MAT
CONSTRUCTION MAT END
OVERLAP INTERLOCK WITH
STRAP CONNECTORS
20' OR AS REQUIRED
TO ACCOMMODATE
ANTICIPATED
TRAFFIC (WIDTH
CAN BE LESS IF
CONST. VEHICLES
ARE PHYSICALLY
CONFINED ON 80TH
SIDES)
VTC-3. VEHICLE TRACKING CONTROL W/ CONSTRUCTION
MAT OR TURF REINFORCEMENT MAT (TRM)
November 20 I0
Urban Drainage and Flood Control District VTC-5
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
STABILIZED CONSTRUCTION ENTRANCE/EXIT INSTALLATION NOTES
1. SEE PLAN VIEW FOR
-LOCATION OF CONSTRUCTION ENTRANCE(S)/EXIT(S).
-TYPE OF CONSTRUCTION ENTRANCE(S)/EXITS(S) (WITH/WITHOUT WHEEL WASH,
CONSTRUCTION MAT OR TRM).
2 CONSTRUCTION MAT OR TRM STABILIZED CONSTRUCTION ENTRANCES ARE ONLY TO BE
USED ON SHORT DURATION PROJECTS (TYPICALLY RANGING FROM A WEEK TO A MONTH)
WHERE THERE WILL BE LIMITED VEHICULAR ACCESS.
3. A STABILIZED CONSTRUCTION ENTRANCE/EXIT SHALL BE LOCATED AT ALL ACCESS POINTS
WHERE VEHICLES ACCESS THE CONSTRUCTION SITE FROM PAVED RIGHT-OF-WAYS.
4 STABILIZED CONSTRUCTION ENTRANCE/EXIT SHALL BE INSTALLED PRIOR TO ANY LAND
DISTURBING ACTIVITIES.
5 A NON —WOVEN GEOTEXTILE FABRIC SHALL BE PLACED UNDER THE STABILIZED
CONSTRUCTION ENTRANCE/EXIT PRIOR TO THE PLACEMENT OF ROCK.
6. UNLESS OTHERWISE SPECIFIED BY LOCAL JURISDICTION, ROCK SHALL CONSIST OF DOT
SECT. #703, AASHTO #3 COARSE AGGREGATE OR 6" (MINUS) ROCK.
STABILIZED CONSTRUCTION ENTRANCE/EXIT MAINTENANCE NOTES
1 INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION.
MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS
POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE
EROSION, AND PERFORM NECESSARY MAINTENANCE.
2. FREOUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN
EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMENTED THOROUGHLY.
3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON
DISCOVERY OF THE FAILURE
4. ROCK SHALL BE REAPPLIED OR REGRADED AS NECESSARY TO THE STABILIZED
ENTRANCE/EXIT TO MAINTAIN A CONSISTENT DEPTH.
5 SEDIMENT TRACKED ONTO PAVED ROADS IS TO BE REMOVED THROUGHOUT THE DAY AND
AT THE END OF THE DAY BY SHOVELING OR SWEEPING. SEDIMENT MAY NOT BE WASHED
DOWN STORM SEWER DRAINS.
NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS.
CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN
DIFFERENCES ARE NOTED.
(DETAILS ADAPTED FROM CBI' OF BROOMFIELD. COLORADO. NOT AVAILABLE IN AUTOCAD)
VTC-6
Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
DRAINAGE CRITERIA MANUAL (V. 3) CONSTRUCTION BEST MANAGEMENT PRACTICES
1s,
(44 Is,
SILT FENCE INSTALLATION
-NTS-
POST ANCHORED TO FABRIC
NOTE EROSION CONTROL MEASURES
SHALL BE MAINTAINED UNTIL
I ANDSCAPING IS COMP! [TED,
OR AS DIRECTED BY LOCAL
JURISDICTION
2
1/2H
(12" MIN)
z
- N
ty
FABRIC MATERIAL
(ANCHORED IN TRENCH)
4'x4" TRENCH
COMPACTED
BACKFILL
r FLOW
SECTION
-NTS-
DETAILS PROVIDED TO DISTRICT BY THE CITY OF BROOMFIELD, COLORADO
Figure C5 -10 —Silt Fence Erosion Barrier
2007-10 C-63
Urban Drainage and Flood Control District
Hello