HomeMy WebLinkAboutSWMP West Glenwood PropertySTORMWATER MANAGEMENT PLAN (SWMP)
WEST GLENWOOD PROPERTY
MAY 2O2O
Revision March 2022
Prepared for Owner and Operator:
6874 CO-82
Glenwood Sprihgs, CO 81601
Prepared by:*rk*
Summit
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CO¡ÍPLIANfg
ELEUåtrED,D 5ERVICES GROU P -1Tj zOOt
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan {SWMp}
Table of Contents
SWMP General Requirements
Coverage Under the COR400000 Permit
Qualified Stormwater Manager
Spill Prevention and Response Plan
Materials Handling
Potential Sources of Pollution
lmplementation of Control Measures
Tab 1
...Tab 2
.Tab 3
Tab 4
Tab 5
Tab I
Tab I
Site Description.
a)
b)
c)
d)
e)
f)
s)
h)
Tab 6
Nature of Construction Activity at the Site
Proposed Schedule for Major Construction Activities and Control Measures
lmplementation
Total Acreage of Site and Area to be Disturbed
Existing Soils Data
Existing Vegetation and Topography
Allowable Non-Stormwater Discharges and Low Risk Discharges
Receiving Waters
Stream Crossings Located within the Construction Site Boundary
TabTSite Map
Final Stabilization and Long-Term Stormwater Management
Temporary Stabi lization
lnspection Reports
lnspection Schedule
lnspection Scope
CM Maintenance
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West Glenwood Property
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Stormwater Management Plan iSWMp)
Appendices
AppendixA CM Details/lnstallation Specifications
Appendix B Permits, Applications, Forms
Appendix C Misce|laneous.......................
Documented Use Agreement
Appendix D Amendment Log
Appendix E Site-Specific Maps
Appendix F Soils Report
Tab 10
Tab 11
...Tab 12
Tab 13
Tab 14
Tab 15
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West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMP)
swMp GENERAL REQUIREMENTS (Sl.C.r )
This stormwater management plan (SWMP) was initially* developed for the West Glenwood Property in the
County of Garfield, State of Colorado. The facility has been issued Cedification Number COR408974 to
discharge stormwater associated with construction activities under CDPS General Permit COR400000. The
nature of construction activity is to stage equipment and materials for the Cedar Crest lmprovements project
(COR4OS9B2) in the City of Glenwood Springs and then develop the property for commercial/residential
land use.
Note: This SWMP revision is to address the change in the nature of construction activities at the site and
the addition of approximately 7 acres to the permitted facility. ln 2022, the Permittee proposes to reclaim
and revegetate the site to accommodate construction of a commercial (storage unit) facility.
CDPS Stormwater Permittinq
The West Glenwood Property SWMP has been prepared in accordance with good engineering, hydrologic,
and pollution control practices per the Colorado Discharge Permit System (CDPS) General Permit for
Stormwater Discharges Assocrafed with Construction Activity (Permit No. COR400000). The CDPS
General Permit (Permit) authorizes stormwater discharges from construction activities that result in a total
land disturbance of one acre or greater, if a project is less than one acre but part of a larger common plan
of development, or for discharges designated by the Water Quality Control Division (Division) as needing a
stormwater permit. A copy of the CDPS General Permit and project Certification can be found in Appendix
B (Tab 1'1) of the SWMP.
Owner and Operator
The West Glenwood Property SWMP was prepared by Summit Services Group, LLC for Gould
Construction, lnc. (Owner and Operator). lt includes information and/or data gathered from multiple
sources, including but not limited to the facility's Berm Grading Plan (Sopris Engineering, LLC; 2020),
Grading Permit documents (Sopris Engineering, LLC;2022), the Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual (2010), General Permit NumberCOR400000, and the FactSheet
to Permit Number COR400000.
Gould Construction, lnc. (Permittee) will implement the provisions of this SWMP as written and updated,
from commencement of proposed construction activities until final stabilization is achieved and Permit
coverage is terminated, transferred, modified, etc.
covERAGE UNDER THE GENERAL PERMIT (Sl.A.1)
A. AuthorizedDischarqes
The State of Colorado General Permit for Stormwater Discharges (Permit) authorizes Gould Construction,
lnc. to discharge the following to State waters (Colorado River): stormwater associated with construction
activity and specified non-stormwater associated with construction activity.
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$tormwater Management Plan {$WMP)
The following types of stormwater and non-stormwater discharges are authorized under the Permit.
1. Allowable Stormwater Discharqes
a Stormwater discharges associated with construction activity. Applicable to the project.
b. Stormwater discharges associated with producing earthen materials, such as soils, sand, and
gravel dedicated to providing material to a single contiguous site, or within T¿ mile of a construction
site (i.e. borrow or fill areas). Not applicable to the project.
c. Stormwater discharges associated with dedicated asphalt, concrete batch plants and masonry
mixing stations. (Coverage under the Permit is not required if alternative coverage has been
obtained). Not applicable to the project.
d. Discharges to outstanding waters. Outstanding waters shall be maintained and protected at their
existing quality. (https://www.colorado.qov/pacific/cdphe/clean-water-qis-maps) An "outstanding
waters" designation may be applied to certain high quality waters that constitute an outstanding
natural resource. No degradation of outstanding waters by regulated activities is allowed. (Source:
Colorado Water Quality Management and Drinking Water Protection Handbook, 2006) Not
applicable to the project.
2. Allowable Non-Stormwater Discharqes
The following non-stormwater discharges are allowable under the Permit if the discharges are identified in
the SWMP in accordance with Part l.C. of the Permit, and if they have appropriate control measures (CMs)
in accordance with Part 1.8.1. Tab 6 of the SWMP furlher describes allowable non-stormwater sources and
their potential(s) for discharge(s) at the West Glenwood Property construction site.
a. Discharges from uncontaminated springs that do not originate from an area of land disturbance
Not anticipated for the project.
b. Discharges to the ground of concrete washout water associated with the washing of concrete tools
and concrete mixer chutes. Discharges of concrete washout water must not leave the site as
surface runoff or reach receiving waters as defined by the Permit. Concrete on-site waste disposal
is not authorized by this Permit except in accordance with Part LB.1.a.ii.b. A potential forthe
project.
c Discharges of landscape/agricultural irrigation return flow. Not anticipated for the project.
d. Discharges from diversions of State waters within the permitted site. Not anticipated for the
project.
3. Emerqencv Fire Fightinq
Discharges resulting from emergency firefighting activities are authorized by the Permit.
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Stormwater Management Plan {SWMpi
B. Limitations on Coveraqe
Discharges not authorized by the Permit include, but are not limited to, the discharges and activities listed
below. Gould Construction, lnc. may seek individual or alternate general permit coverage for these
discharges, as appropriate and available and as needed the SWMP will be updated to include (in Appendix
B, Tab 11) the applicable permits.
1 . Discharges of Non-Stormwater - Discharges of non-stormwater, except the authorized non-stormwater
discharges listed in Part 1.4.1.b., are not eligible for coverage under the Permit.
2. Discharges Currently Covered by another lndividual or General Permit.
3. Discharges Currently Covered by a Water Quality Control Division (Division) Low Risk Guidance
Document, including but not limited to hot springs, potable water, uncontaminated groundwater to land,
power washing operations to land, discharges from snow melting machines, etc.
G. Dewatering
Groundwater and/or stormwater dewatering practices are not anticipated for this project. lf needed, the
SWMP shall clearly describe and locate (on Site Maps in TabT) the practices implemented at the site to
control stormwater pollution from the dewatering of groundwater or stormwater from excavations, wells, etc.
Discharges to the ground from construction dewatering activities that do not meet the criteria of the
Division's Low Risk Discharge Guidance Policy may require coverage under a separate CDPS discharge
permit. As needed, separate CDPS discharge permits will be included in Appendix B (Tab 1 1) of the SWMP.
Gould Construction, lnc. will take all reasonable steps to minimize or prevent any discharge in violation of
the Permit which has the reasonable likelihood of adversely affecting human health or the environment.
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West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMP)
TAB 1
QUALIFIED STORMWATER MANAGER
RESPONSIBLE PARTIES
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West Glenwood Property
Gould Construction, lnc.
$tormwater Management Plan ($WMp)
1. QUALIFIED STORMWATER MANAGER ($1.C.2.a.i)
A. Qualified Stormwater Manaqer (definition):
"An individual knowledgeable in the principles and practices of erosion and sediment control and pollution
prevention, and with the skills to assess conditions at construction sites that could impact stormwater quality
and to assess the effectiveness of stormwater controls implemented to meet the requirements of this
permit."
Gould Construction, lnc. (Permittee) will ensure that the individuals responsible for meeting the
requirements of the Permit are properly trained on up{o-date stormwater management practices in the area
of construction stormwater discharges. Proper training may include, but is not limited to proper selection,
implementation, operation, and maintenance of various structural and non-structural control measures;
proper documentation of various Permit requirements (e.9. inspections, corrective actions and SWMP
documentation); on-the-job or in-house training; training and testing leading to certification(s); etc.
QUALIFED STORMWATER MANAGER(S)
lndividual& Gompany Title Qualifications; Contact lnfo
B. Responsible PaÉies
For State stormwater permitting purposes, Gould Construction, lnc. is the Owner and Operator of the West
Glenwood Property permitted facility and project and may have construction contractors and/or
subcontractors supplying equipment, materials, labor, and other services for the commercial development.
Compliance with the project stormwater management plan includes:
Stormwater Management Plan (SWMP) implementation;
ldentification of potential pollutant sources;
Control measure installation and maintenance; and
Modification and updates to the SWMP.
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a
a
West Glenwood Property
Gould Construction, lnc.
$tormwater Management Plan ($WMp)
Gould Construction, lnc. will be responsible for on-site construction activities and related stormwater
management, and they will be the primary contact for the CDPHE, Garfield County, and other regulatory
agencies with an interest in the project's stormwater management program. Contact information for
responsible parties of the project is noted in the table below.
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RESPONSIBLE PARTIES
Gompany/Agency Scope of
Service
CDPHE
Permit Holder Responsi bi I ities/Gontact lnformation
Gould Construction, lnc.
Owner
&
Operator
Yes
(coR408974)
. Obtain stormwater management plan
(swMP)
r File Notice of lntent (NOl)
. File lnactivation Notice (NOT)
. Control of day-to-day operations
. SWMP Administration/Training
. Stormwater lnspections
o Stormwater Responsive Actions
¡ 970.379.4602; Evan Gould, Risk Manager
Sopris Engineering,
LLC
Civil
Engineering No
. Surveying
¡ Construction Drawings
. 970.704.0311; Yancy Nichol, P.E
Summit Services
Group, LLC
Stormwater
Consultants N/A
. SWMP Administration Assistance
(lmplementation, Maintenance,
Updating/Revision, Training)
. SWMP Development
t 970.812.2293; BJ Russell, Operations
Manager
¡ 970.640.0797;Daniel KinÞ, Lead Plan
Developer
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMP)
TAB 2
SPILL PREVENTION AND RESPONSE PLAN
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Stormwater Management Plan (SWMp)
2. SPILL PREVENTION AND RESPONSE PLAN (S1.C.2.a.¡¡)
The storage of fuels, oils, chemicals, fertilizers, or other similar potential stormwater pollutants at the project
site during active construction is not suggested. Should their use and on-site storage be necessary for
construction activities engineering controls shall be employed to prevent a release of these pollutants to
the environment, to shelter these pollutants from the elements (i.e., weather), and to protect against
vandalism. All construction site wastes shall be properly managed to prevent pollution of State waters
(Colorado River)and Gould Construction, lnc. will not permanently dispose of wastes (e.9., concrete) on-
site.
A. SpillPrevention
Construction procedures and significant materials used during construction activities have the potential to
contribute pollutants to stormwater runoff. Such procedures or significant materials may include building
materials exposed during storage, paints and solvents, fertilizers and chemicals, waste material, and
equipment and fueling procedures.
Spill prevention procedures for the project shall include
1. Equipment fueling and/or re-fueling away from natural drainages and, if possible, in a designated
equipment fueling/staging area.
2. lf release of a hazardous substance does occur, personnel shall appropriately respond to minimize the
impact of the spill by, for example, using sorbent materials stored at the construction site. Sorbent
materials may consist of clay, sawdust, straw, cat litter, booms, pads, or other suitable materials.
3. Bulk (55 gallons or greater) storage for petroleum products and other liquid chemicals will have
secondary containment, or equivalent protection, in order to contain spills and to prevent spilled material
from entering State waters (Colorado River).
4. As needed, sanitary facilities will be located away from natural drainages and areas of high traffic and
will be secured to the ground to prevent spills as a result of being knocked over.
5. lf a spill does occur, post-spill training by authorized personnel to educate jobsite workers about how
to recognize similar hazards and the proper operating procedures needed to reduce or eliminate the
likelihood of future spills at the jobsite.
Potential pollutant releases may also occur from equipment during construction activities. ln the event of a
fuel, lubricant, or coolant release, efforts shall be made to stop the spill, and the spilled fluids shall be
cleaned-up as soon as possible, immediately in most cases. All contaminated soils and used clean-up
materials shall be containerized (i.e., drums, dumpsters, etc.) and stored on-site untilappropriate disposal
methods have been determined and can be used. Necessary repairs shall be made to the damaged
equipment to prevent a continued release of potential pollutants to the environment.
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West Glenwood Property
Gould Construction, lnc.
$tormwater Management Plan {SWMp)
B. Response Plan
Gould Construction, lnc. personnel, or their designated responsible party(ies), shall immediately contact
the CDPHE (1-877-518-5608) to report spills that may result in a non-permitted discharge of pollutants to
State waters. lf more than 1,320 gallons of oil will be stored on-site, a Spill Prevention, Control, and
Countermeasure (SPCC) Plan may be required. lf applicable, AppendixC (Tab 12) includesthe project's
SPCC Plan and/or a Spill Prevention Plan required by a separate CDPS permit.
C. 24-hour Reportinq (Sll.L.6)
Gould Construction, lnc. shall report the following circumstances orally to the CDPHE Water Quality Control
Division (Division) within twenty-four (24) hours from the time of becoming aware of the circumstances; and
will mail to the Division a written report containing the information requested within five (5)working days
after becoming aware of the circumstances.
1. Circumstances leading to any noncompliance which may endanger health or the environment
regardless of the cause of the incident;
2. Circumstances leading to any unanticipated bypass which exceeds any effluent limitations in the
Permit;
3. Circumstances leading to any upset which causes an exceedance of any effluent limitation in the
Permit;and
4. Daily maximum violations for of the pollutants listed in the Permit, including any toxic pollutant or
hazardous substance or any pollutant specifically identified as the method to control any toxic pollutant
or hazardous substance.
CDPHE CDPHE
Clean Water Gompliance Section
Water Quality Compliance Section
Telephone: (303) 692-3500
Clean Water Compliance Section
Water Quality Control Division
Colorado Department of Public Health
and Environment (CDPHE)
WQCD-WQP-82
4300 Cherry Creek Drive South
Denver, CO 80246-'1530
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West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan {SWMP)
TAB 3
MATERIALS HANDLING
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West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMp)
3. MATERIALS HANDLING ($l.C.2.a.iv)
The West Glenwood Property stormwater management plan (SWMP) describes and locates control
measures (CMs) to be implemented at the construction site to minimize the impacts from handling
significant materials that could contribute pollutants to stormwater runoff. These handling procedures mav
ínclude, but not be limited to, CMs for pollutants and activities such as:
. exposed storage of building materials,
o paints and/or solvents,
¡ landscape/final stabilization materials,
¡ fertilizers and/or chemicals,
. sanitary waste materials,
o trash and equipment maintenance,
. fueling procedures and supplies, and
¡ training.
As noted in the Spill Prevention and Response Plan section above, the storage of fuels, oils, chemicals,
fertilizers, or other similar potential pollutants at the project site during the specified construction periods is
not suggested. lf it becomes necessary to store such items on-site, engineering controls shall be employed
to prevent a release of these pollutants to the environment, to shelter these pollutants from the elements
(i.e., weather), and to protect against vandalism. Bulk (55 gallons or greater) storage for petroleum products
and other liquid chemicals must have secondary containment, or equivalent protection, to contain spills and
to prevent spilled materialfrom entering State waters (Colorado River).
Consistent with requirements of the CDPS General Permit for Stormwater Discharges Assocrafed with
Construction Activity, all potential pollutants (other than sediment) shall be handled and disposed of in a
manner that does not contaminate stormwater. All workers shall exercise care in equipment fueling, oiling,
and maintenance operations; and construction equipment on the jobsite shall be in proper (i.e., no leaks)
working order at all times. Construction equipment requiring routine servicing shall be serviced prior to
arriving on-site or shall be serviced on-site in the designated staging area with appropriate clean-up
materials (i.e., spill kit) being easily accessible for use in the case of a spill.
Portable toilets and waste disposal containers shall be provided for the jobsite and good housekeeping
practices followed to ensure they are properly maintained and that wastes are properly disposed of when
containers are full or in need of maintenance. Portable toilets and designated trash and bulk waste-
collection areas shall be located on-site where shown on the Site Maps in Part 7 of this SWMP.
A. Siqnificant Materials (definition):
"lncludes, but is not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic
pellets; finished materials such as metallic products; raw materials used in food processing or production;
hazardous substances designated under section 101(14) of CERCLA; any chemical the permittee is
required to report under section 313 of Title lll of the Supedund Amendments and Reauthorization Act
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Slormwater Management Plan ($WMP)
(SARA); fertilizers; pesticides; and waste products such as ashes, slag and sludge that have the potential
to be released with stormwater discharges."
B. Gonstruction Site Good Housekeepinq Measures
Good housekeeping measures will be implemented to minimize or eliminate the potential for stormwater
pollution from accidental spills or releases of significant materials. The following table generally describes
the practices to be implemented at the West Glenwood Property construction site to control stormwater
pollution from construction site wastes (liquid and solid), including concrete washout activities. As needed
the control measures used for the pollutant sources listed will be shown on the Site Maps (Tab 7) and
detailed in Appendix A (Tab 10) of the SWMP.
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Waste Management Practices
MateriaUPotential
Pollutant Sources Gomments/Control Measures Selection
Liquid Chemicals including
Solvents, Stains, and Paint
Liquid chemicals shall be stored in leak proof containers and removed from the site
when not in use. They should be stored in their original labeled container, per
manufacturer specifications, sealed when not in use, and stored away from any
potential water sources, proposed inlets, or drainage-ways.
Secondary containment shall be used for bulk (55 gallons or greater) storage of
petroleum products and other liquid chemicals. Use of liquid chemicals should be
performed as specified by the manufacturer and away from surface
waters/drainages. Equipment shall not be refilled near surface waters or drainage
channels. The location(s) of liquid chemicals at the project site shall be indicated on
the Site Maps in Part 7 of this SWMP.
Fuels, Oils
Small amounts of fuel containing products may be stored on-site, in leak-proof,
Iabeled containers away from water sources and drainages. Secondary containment
shall be used for bulk (55 gallons or greater) storage. The location(s) of fuels and
oils on-site shall be indicated on the Site Maps in Part 7 of this SWMP.
Construction Waste, Trash
Trash around the site shall be picked up on a daily basis and stored in leak-free
dumpsters or similar receptacles on-site. Regular trash pickup shall be scheduled
as needed (to prevent over-filling/{opping), and covered dumpsters and trash
containers shall be used at times of high wind. The location(s) of trash receptacles
for the project shall be indicated on the Site Maps in Part 7 of this SWMP.
Portable Toilets
Portable toilets shall be placed away from drainage swales/channels and other
stormwater conveyances, proposed and existing. They shall be anchored to and
located on permeable surfaces and contained by perimeter CMs as needed. Clean-
out and maintenance shall be performed on a regularly scheduled basis. Ïhe
location(s) of portable toilets at the project site shall be indicated on the Site Maps
in Parf 7 of this SWMP.
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan iSWMP)
Waste Management Practices
Material/Potential
Pollutant Sources Comments/Control Measu res Selection
Management of
Contaminated Soils
Soils contaminated by construction activities shall be contained to prevent further
spread of the contaminants. Contaminated materials, soils, etc. shall be cleaned-up
and placed in a sealed, leak-proof container and disposed of in accordance with
local (e.9., Garfield County) requirements. The SWMP shall be updated with the
date, name of spilled material, clean-up details, and location of the contamination.
Concrete Washout Area
(cwA)
A concrete washout area shall be used to manage wash water from washing of tools
and concrete mixer chutes, masonry equipment, and liquid concrete waste from
dump trucks, mobile batch mixers, or pump trucks. CWAs may be lined or unlined
excavated pits in the ground, commercially manufactured prefabricated containers,
or aboveground holding areas constructed with berms, sandbags, or straw bales
with a plastic liner. The location and type of this CM used for the project shall be
indicated on the Site Maps in Part 7 of this SWMP.
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TAB 4
POTENTIAL SOURCES ,OF FOLLUTION
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1"800{40¡7Q67,
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan {SWMP)
4. POTENTIAL SOURCES OF POLLUTION ($1.G.2.a.v)
The locations and descriptions of potential pollution sources, including surface disturbing activities, with the
potential to impact stormwater runoff at the West Glenwood Propefty are described in Tab 5 of this
stormwater management plan (SWMP). Sediment will be the main pollutant of concern for the project. Other
potential stormwater pollutants may be derived from equipment fueling and oiling operations during
construction, construction-generated solid trash debris, and concrete activities. As needed, on-site storage
of construction materials shall be within the designated area(s) indicated on the Site Maps (Tab 7).
A. Potential Pollutant Sources
The following potential pollutant sources which may reasonably be expected to affect the quality of
stormwater discharges have been evaluated for the project.
1. disturbed and stored soils (from grading, excavating, stockpiling, etc.)
2. vehicle tracking of sediments (onto adjacent paved roads)
3. management of contaminated soils
4. loading and unloading operations
5. outdoor storage activities (erodible building/construction materials, fertilizers, chemicals, etc.)
6. vehicle and equipment maintenance and fueling
7. significant dust or particulate generating processes (e.9., saw cutting materials, including dust);
8. routine maintenance activities involving fertilizers, pesticides, herbicides, detergents, fuels, solvents,
oils, et cetera
L on-site waste management practices (waste piles, liquid wastes, dumpsters, etc.)
10. concrete truck/equipment washing, including washing of the concrete truck chute and associated
fixtures and equipment
11. dedicated asphalt, concrete batch plants and masonry mixing stations
12. non-industrial waste sources such as worker trash and portable toilets
B. Stormwater Discharqes Associated with Gonstruction Activitv ($1.4.1)
The Permit authorizes the discharge of stormwater associated with construction activities that occur at a
variety of facilities and locations with the intent to reduce the amount of pollutants entering streams, rivers,
lakes, and wetlands. The many kinds of pollutants (listed above) from residential, commercial, and industrial
construction activities have the potentialto contaminate stormwater runoff. Sediment is the primary pollutant
of concern at most construction sites. Construction activities, including the use of toxic or hazardous
materials (e.9., fuels, oils, fertilizers, pesticides, and herbicides) and building materials (e.9., asphalt,
concrete, and sealants) also have the potential to contaminate stormwater.
The following list of construction activities and/or discharges covered by the Permit are included in this
section of the SWMP to help Gould Construction, lnc. (Permittee) and the project's Qualified Stormwater
Manager(s) identify any new pollutants by giving examples of activities which may produce pollutants with
the potential to contaminate stormwater discharges. Points 1 and 2 are not applicable.
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Stormwater lVanagement Plan {SWMP)
1. Construction activity at minino facilities - Construction of staging areas, driveways, pads for storage of
auxiliary vehicles and equipment, and structures are examples of construction activities that occur at
mining facilities with the potential to contribute pollutants to stormwater.
2. Construction at oil and gas facilities - Stormwater discharges associated with construction activities
directly related to oil and gas exploration, production, processing, and treatment operations or
transmission facilities.
3. Construction support activities - Stormwater discharges from construction support activities dedicated
to a single contiguous [i.e., construction activities located in close proximity to each other (within %
mile)l construction site. Not anticipated for the project.
4. Masonrv mixinq stations, dedicated asphalt, and concrete batch plants - This includes concrete and
asphalt batch plants and borrow or fill areas that produce earthen materials, such as soils, sand, and
gravel. Benchmark sampling is not required for these types of sand and gravel facilities because they
more closely meet the definition of construction activities than mining activities. Not anticipated for
the project.
5. Discharses to the oround of concrete washout waste - This includes washout waste discharged to the
ground as authorized by the Permit and washout waste from concrete trucks and masonry operations
contained on-site. Depth to water table in the project area is more than B0'. A potential for the project.
Control measures designed for concrete washout wastes shall be implemented at the project site and
Gould Construction, lnc. will ensure that washing activities do not contribute pollutants to stormwater
runoff or receiving waters. Discharges that may reach groundwater will flow through soil that has a
buffering capacity prior to reaching groundwater. Concrete washout areas shall not be located where
shallow groundwater may be present and would result in the soil buffering capacity not being adequate.
Hardened concrete wastes on the ground will be picked up daily and disposed of properly. The depth
to water table in the project area is more than B0 inches.
G. Gonstruction Activitv (definition):
"Ground surface disturbing and associated activities (land disturbance), which include, but are not limited
to clearing, grading, excavation, demolition, installation of new or improved haul roads and access roads,
staging areas, stockpiling of fill materials, and borrow areas. Construction does not include routine
maintenance to maintain the original line and grade, hydraulic capacity, or original purpose of the facility.
Activities to conduct repairs that are not part of routine maintenance or for replacement are construction
activities and are not routine maintenance. Repaving activities where underlying andior surrounding soil is
exposed as part of the repaving operation are considered construction activities. Construction activity is
from initial groundbreaking to fìnal stabilization regardless of ownership of the construction activities."
An appropriate series of structural, non-structural, and procedural measures shall be selected to control
potential pollutant sources during construction at the West Glenwood Property construction site. Tab 5 lists
and locates the potential pollution sources for the project and the selected measures to be implemented to
control them.
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5. IMPLEMENTATION OF CONTROL MEASURES ($l.C.2.a.vi)
The West Glenwood Property stormwater management plan (SWMP) includes design specifications
containing information on the implementation of control measures in accordance with good engineering,
hydrologic, and pollution control practices. Control measure (CM) details (from the Urban Drainage and
Flood Control District) are contained in Appendix A (Tab 10) of the SWMP and include installation and
implementation specifications to ensure proper implementation, operation, and maintenance of each control
measure used for the project.
Gould Construction, lnc. (Permittee and Operator) will implement CMs to minimize the discharge of
pollutants from all potential pollutant sources at the project site. CMs will be installed prior to
commencement of construction activities that may contribute pollutants to stormwater discharges. Control
measures will be selected, designed, installed, and maintained in accordance with good engineering,
hydrologic, and pollution control practices to prevent pollution or degradation of State waters (Colorado
River).
A. Gontrol Measures for Stormwater Pollution Prevention
The primary pollutant of concern at the West Glenwood Property construction site is sediment. Both
structural and non-structural CMs have been selected for implementation to effectively minimize erosion,
sediment transport, and the release of other pollutants related to construction activity.
The following is an overview of the stormwater CMs the Gould Construction, lnc. may (in different
combinations) implement during construction activities as conditions warrant. "Specific" control measures
used to meet effluent limitations (addressed in Part B below) will meet the requirements as listed in the
Permit. During on-site inspections the CMs shall be evaluated for proper function, installation, and
effectiveness.
1. Structural Practices for Erosion and Sediment Control
Structural practices are implemented at the site to minimize erosion and sediment transport. The structural
control measures which may be used for this project are generally described below, will be indicated on the
CM Site Maps (Tab 7) when implemented, and are detailed in Appendix A (Tab 10) of the SWMP.
Note: Stormwater runoff from all disturbed surfaces and soil storage areas for which permanent or
temporary stabilization is not implemented, must flow to at least one CM (e.9., earthen berms, silt fence,
etc.) to minimize sediment in the discharge. This may be accomplished through filtering, settling, or
straining, and the CM will be selected, designed, installed, and adequately sized in accordance with good
engineering, hydrologic, and pollution control practices. The control measure(s) will contain or filter flows in
order to prevent the bypass of flows without treatment and will be appropriate for stormwater runoff from
disturbed areas and for the expected flow rate, duration, and flow conditions (i.e., sheet flow) dictated by
project ground disturbances.
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a Earth Dikes and Drainaqe Swales (ED/DS)
Earth dikes and drainage swales are temporary stormwater conveyance control measures constructed
either to divert runoff around areas of concern (e.9., prone to erosion, work areas) or to convey runoff
to additional sediment control measures (i.e., sediment trap or basin, drainage swales, culverts, etc.)
prior to discharge off-site. Earth dikes and drainage swales should be well compacted and capable of
resisting erosive velocities; and earth dikes may require additional downgradient sediment control
measures (i.e., wattles).
Earth dikes (berms)/Drainage swales are planned for use in the initial and interim phases of
construction as a perimeter controlfor the site in general. Where used, the location(s) of this CM shall
be indicated on the Srfe Maps in Part 7 of this SWMP.
Nate: A permanent stabilized drainage swale, lB" deep and six feet wide, will be constructed along the
earthen berm on the south side of the facility. The swale will discharge into the detention pond in the
northeast corner of the facility.
b. Silt Fence (SF)
Silt fence is a woven geotextile fabric attached to wooden posts and trenched into the ground. lt is
designed as a sediment barrier used to intercept sheet flow runoff from disturbed areas and forcing the
stormwater to evaporate or infiltrate the ground. Silt fence is used where runoff is conveyed from a
disturbed area as sheet flow and is not designed to receive concentrated flow or be used as a filter
fabric. Appropriate uses include downslope of disturbed areas to intercept sheet flow; and along the
perimeter of construction sites, streams, ponds, and wetlands.
Silt fence is planned for use in the initial and interim phases of construction downslope of disturbed
areas not controlled by eañhen berms/drainage swa/es and may be used as containment for concrete
activities and around material storage/staging areas. Where used, the locations of this CM shall be
indicated on the Site Maps in Pañ 2 of this SWMP.
c. Sediment Basin (SB)
A sediment basin is a temporary pond built on construction sites to capture eroded or disturbed soils
transported in stormwater runoff prior to discharge from the site. Sediment basins are designed to
capture site runoff and slowly release it, allowing time for settling of sediment prior to discharge.
A temparary sediment basin is planned for use during the initial and interim phases of construction and
will permanently be used (as a water quality detention pond) for post-construction stormwater
management for the developed slfe. Ihe location of this CM is indicated an fhe Sife Maps in Part 7 of
this SWMP.
d. Temporarv Outlet Protection (TOP)
Temporary (and often permanent) outlet protection is used to reduce erosion immediately downstream
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of pipes, culverts, slope drains, rundowns, and other stormwater runoff conveyances with concentrated,
high-velocity flows. Typically constructed of riprap or rock aprons at the conveyance outlet, temporary
outlet protection is used when stormwater discharges onto a disturbed suface with the potential for
accelerated erosion due to concentrated flow.
Permanent outlet protection (e.9., riprap) will be used for long-term stormwater management to control
erosion from detention pond discharges. An 18" nominal, t0' wide, and 60' long rundown will be
constructed in the southeast corner of the facility and indicated on fhe Sife Maps in Part 7 of this SWMP.
e. Rolled Erosion Control Product (RECP)
Rolled erosion control products, including erosion control blankets (ECBs) and turf reinforcement mats
(TRMs), are manufactured products designed to temporarily or permanently control erosion and
enhance vegetative establishment and survivability on slopes and in channels. They are often used on
disturbed surfaces with steep slopes, in areas with highly erosive soils, and as part of drainage
stabilization.
ECB is a degradable temporary rolled erosion control product composed of processed natural or
polymer fibers mechanically, structurally, or chemically bound together to form a matrix providing
erosion control and facilitaiing vegetative establishment.
TRM is a rolled erosion control product composed of non-degradable synthetic fibers, filaments, nets,
wire mesh, etc. processed into a permanent three-dimensional matrix of sufficient thickness to provide
erosion protection, enhance vegetative establishment, and provide long-term functionality by
permanently reinforcing vegetation during and after maturation. TRMs are typically used for discharges
exerting flow velocities and sheer stresses exceeding the typical limits of mature natural vegetation.
Rolled erosion control products may be used where permanent seed mix rs used on temporary and/or
permanent s/opes steeper than 3:1 (horizontal to vertical) and for drainage swales with grades sfeeper
than 2%. lf used, the location of this CM will be indicated on the Sde Maps in Part 7 of this 9WMP.
2. Non-Structural Practices for Erosion and Sediment Control
Non-structural control measures (CMs) implemented for the West Glenwood Property project site to
minimize erosion and sediment transport during construction activities may include temporary and
permanent stabilization practices, stockpile management, surface roughening, mulching, construction
phasing/sequencing, stormwater inspections, good housekeeping practices, etc.
Note: Stormwater runoff from all disturbed areas and soil storage areas for which permanent or temporary
stabilization (e.9., compacted milled asphalt surfaces) is not implemented must flow to at least one CM to
minimize sediment in the discharge. This may be accomplished through filtering, settling, or straining, and
the CM will be selected, designed, installed, and adequately sized in accordance with good engineering,
hydrologic and pollution control practices. The control measure(s) will contain or filter flows in order to
prevent the bypass of flows without treatment and will be appropriate for stormwater runoff from disturbed
areas and for the expected flow rate, duration, and flow conditions (i.e., sheet flow).
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Vehicle Trackinq Control LVTC)
Vehicle tracking control provides stabilized construction site access where vehicles and equipment exit
the site onto paved public roads. VTC helps remove sediment (e.9., mud or dirt) from vehicle and
equipment tires, thereby reducing sediment tracking onto off-site paved surfaces. Effective vehicle
tracking control is important during times of precipitation when mud is easily tracked off-site, during dry
weather conditions when dust is a concern, and when poorly drained, clayey soils are present on site.
Using water to flush sediment off paved surfaces is prohibited.
As needed, a VTC will be implemented and maintained at the stfe access from the existing frontage
road. Approximately 300 feet of the existing access road is gravel surfaced and sediment tracked onto
the adjacent paved surtace will be controlled (and immediately removed) with sweeping.
b. Stabilized Staqinq Area (SSA)
A staging area is a clearly designated location for storage of construction equipment, vehicles,
stockpiles, waste bins, and other construction-related materials. Stabilized staging areas may have a
graveled surface to prevent mud tracking and to reduce stormwater runoff.
A designated staging area shall be implemented and maintained on-slfe as needed. An anticipated
staging area may be used for concrete washout activities and general staging for materials, equipment,
worker vehicles, efc. lf used, the location of this CM shall be indicated on the Site Maps in Part 7 of this
SWMP.
c. Street Sweepins and Vacuuming (SS)
Street sweeping and vacuuming removes sediment and potential pollutants tracked onto roadways
from the construction site and helps to reduce sediment transport into storm drain systems or surface
watenruays via stormwater runoff.
Sfreef sweeping shall be used on a daily basls for any material tracked onto off-site paved roadways.
Tracked sediment needs to be removed and properly disposed of immediately.
d. Surface Roughening (SR)
Surface roughening is used to control erosion by tracking, scarifying, imprinting, or tilling disturbed
surfaces (typically along the contour) to provide temporary stabilization. Surface roughening creates
variations in the soil surface perpendicular to flow lines that help minimize wind and water erosion; and
may also help establish conditions favorable to the establishment of vegetation. SR should be used
together with other erosion and sediment control measures; and is typically implemented at the time of
finalgrading.
As part of sife reclamation and revegetation, surface roughening will be used after final grade is
achieved or to temporarily stabilize a disturbed area during active construction that may become
inactive for a short period of time (typically 14 days). Soil compaction will be minimized for areas where
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infiltratian cantrol measures will be used or where final stabilization will be achieved using an alternative
method (e.9., pavement). lf used, the location of this CM shall be indicated on the Sife Maps in Part 7
of this SWMP.
Nofe; See facility Reclamation, Revegetation, & Weed Management Plan for more information.
e. Temporarv and Permanent Stabilization (TS/PS)
Temporary seeding is used to stabilize disturbed areas that will be inactive for an extended period of
time (typically 14 days or longer). Permanent seeding is used to stabilize areas at final grade that will
not be stabilized using other means (i.e., hardscaping). Effective seeding includes proper seedbed
preparation, selection of an appropriate seed mixture, proper planting techniques, and protection of the
seedbed area with mulch, geotextiles, or other appropriate control measures. Temporary stabilization
methods may include, but not be limited to tarps, soil tackifier, surface roughening, tracking, terracing,
mulching, and hydro-seeding.
Temporary stabilization (e.9., surface roughening, mulching, etc.) will be implemented for earth
disturbing actìvities on any porÍion of the site where ground disturbing construction activity has
permanently ceased, or temporarily ceased for more than 14 calendar days. Final stabilization control
fiieasures (e.9., seeding, sod, mulches, etc.) will be implemented for the developed sife af the time of
landscaping. Where used, the locations of these CMs shall be indicated on the Sde Maps in Part 7 of
this SWMP.
Nofe; See facility Reclamation, Revegetation, & Weed Management Plan for more information.
f. Mulchinq (MU)
Mulches are applied to disturbed soils to help reduce erosion by protecting the bare soil from rainfall
impact, increasing infiltration, and reducing runoff. Mulching consists of applying an even cover of straw,
hay, shredded wood mulch, rock, bark, or compost to disturbed soils and securing the mulch by
crimping, with tackifiers, or other means. lt can be used for temporary or permanent stabilization; and
may be applied using mechanical dry application methods or with hydro-mulching equipment.
Mulches (e.9., hay or straw mulch, fiber, rock/gravel, etc.) may be used during final stabilization for
disturbed areas not improved by structures or hardscaping, or temporarily ta stabilize idle ground
disturbances and/or material stockpiles. /f used, the location(s) of this CM shall be indicated on the Site
Maps in Parl7 of this SWMP
Nofe: See facility Reclamation, Revegetation, & Weed Management PIan for more information.
g. Wind Erosion/Dust Control (DC)
Wind erosion and dust control measures are used to keep soil particles from entering the air during
earth disturbing construction activities. lt is important to control both for the health of workers on-site
and residents adjacent to the project, and for surrounding waterbodies. Methods of control may include
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seeding and mulching, use of soil binders, site watering, and surface stabilization with rock and gravel.
Dust control measures (i.e., application of magnesium chloride and/or water) shall be used when dust
is a potential problem to air quality in the project area. Eafth disturbing construction activities shall be
limited or suspended at times of high wind.
h. Concrete Washout Area (CWA)
A concrete washout area is used to manage wash water from the washing of tools and concrete mixer
chutes, masonry equipment, and liquid concrete waste from dump trucks, mobile batch mixers, or pump
trucks. Concrete waste management involves designating and properly managing a specific area of the
construction site for concrete washout. Washout activities should be conducted in a way that does not
contribute pollutants to surface waters or stormwater runoff. CWAs may be lined or unlined excavated
pits in the ground, commercially manufactured prefabricated containers, or aboveground holding areas
constructed with berms, sandbags, or straw bales with a plastic liner.
A concrete washout area is planned for use in the initial and interim phases of construction. Gould
Construction, lnc. (Permittee) will ensure that washing activities do not contribute pollutants to
stormwater runoff or receiving waters and discharges that may reach groundwater will flow through soil
that has buffering capacity prior to reaching groundwater. The location of this CM shall be indicated in
the field and on fhe Sife Maps in Part 7 of this SWMP.
Note: The depth to water table in the project area is more than 8A inches (source: USDA Soil Report,
Tab 15 of SWMP)
i. Stockpile Manaqement (SM)
Stockpile management includes practices used to minimize erosion and sediment transport from
erodible material/soil stockpiles. Stockpiles should be located away from all drainage-ways and storm
sewer inlets, and a sediment control measure should be placed around its perimeter. Typically, soils
stockpiled for an extended period of time (i.e., 14 days) should be stabilized with seed and mulch, soil
binders, or erosion control blankets.
Soil stockpiles will be located on-sife away from drainage channels and shall be controlled for erosion
and sediment transport with surface roughening, watering, mulch, and/or sift fence (or similar
downslope sediment control measure). Unless infeasible, topsoil shall be preserued for areas of the
site that will utilize vegetative final stabilization measures. lf used, the location of this CM shall be
indicated on the Srfe Maps in Part 7 of this SWI'4P.
Good Housekeepinq Practices (GH)
Good housekeeping practices are used to prevent pollution associated with solid, liquid, and hazardous
construction-related materials and wastes. Good housekeeping practices include providing control
measures for waste management; establishing proper building material staging areas; designating
paint and concrete washout areas; establishing equipment and vehicle fueling and maintenance
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practices and areas; if needed, developing an SPCC Plan; etc. Good housekeeping practices are
always necessary at construction sites.
Good housekeeping practices shall always be employed at the construction site during active
construction. As needed, loads of cut and fill materials imported to or exported from the site will be
properly loaded and covered to prevent loss during transport. When applicable, the location(s) of tltis
CM shall be indicated on the Slfe Maps in Part 7 of this SWMP.
k. ConstructionPhasinq/Sequencinq (CP)
Construction phasing/sequencing refers to managing a construction site to avoid disturbing the entire
suface area at one time. When grading and construction activities are completed, and soils are
stabilized for one part of the site, grading and construction activities can begin on another part of the
site. Care must be given during construction to minimize the disturbance of vegetation, and native
vegetation shall remain on-site until it is necessary to remove for required construction activities.
Construction phasing/sequencing practices shall be employed at the construction site through all
phases of ground disturbing activities. The amount of soilexposed during construction activity will be
minimized to the extent practicable, and pre-existing vegetation shall be retaìned and protected
whenever possr'ô/e. The location(s) of disturbed and stabilized areas shall be indicated on the Site Maps
in Part 7 of this SWinP.
B. Specific Non-Structural Gontrol Measures
"specific" non-control measures used for effluent limitations will meet the following requirements.
1. Vehicle tracking controls shall either be implemented to minimize vehicle tracking of sediment
from disturbed areas, or the areas where vehicle tracking occurs shall have measures in place
that contain or filter flows in order to prevent the bypass of flows without treatment.
The proiect's plan for meetino the requirement: The project may implement a vehicle tracking control
(VfC), or manufactured proprietary device, at the entrance from the graveled access road until on-site
disturbed surfaces used for construction access are stabilized. Areas where vehicle tracking occurs do
not have storm drain inlets, drainage channels/ditches/swales, etc. requiring sediment controls.
2. Stormwater runoff from all disturbed areas and soil storage areas will utilize or flow to one or
more GMs to minimize erosion and sediment in the discharge. The GMs will be selected,
designed, installed, and adequately sized in accordance with good engineering, hydrologic and
pollution control practices. The control measure(s) will contain or filter flows in order to prevent
the bypass of flows without treatment and will be appropriate for stormwater runoff from
disturbed areas and for the expected flow rate, duration, and flow conditions (i.e., sheet flow).
The proiect's olan for meeting the requirement: During the initial phase of construction, stormwater
runoff will flow to silt fence or earthen berms at the downgradient sides of the site before discharging
off-site. The permitted facility is in a rural area without a designed and constructed stormwater
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management system
3. Selection of control measures will prioritize the use of structural and non-structural GMs that
minimize the potential for erosion (e.9., covering materials). The selection will prioritize phasing
construction activities to minimize the amount of soil disturbance at any point in time
throughout the duration of construction.
The þroiect's plan for meeting the requirement: The West Glenwood Property project will be phased to
minimize the amount of soil disturbances at any point in time and control measures will be selected to
prioritize the potential for erosion. Tab 6 includes a schedule for construction activities.
4. Outlets that withdraw water from or near the surface shall be installed when discharging from
basins and impoundments, unless infeasible.
The proiect's plan for meetinq the requirement: The developed site will have a detention pond with
outlet that withdraws water from or near the surface. Stormwater will discharge from the detention pond
using 12" HDPE and stabilized permanent outlet.
5. Maintain pre-existing vegetation or equivalent control measures for areas within fifty (50)
horizontal feet of receiving waters as defined by the Permit, unless infeasible.
The oroiect's plan for meetinq the requirement: This control measure is not applicable to the West
Glenwood Property. The permitted facility does not have pre-existing vegetation or equivalent control
measures for areas within 50 horizontal feet of receiving waters.
6. Minimize soil compaction for areas where infiltration control measures will be used or where
final stabilization will be achieved through vegetative cover.
The proiect's plan for meetinq the requirement: To minimize soil compaction for areas where infiltration
control measures will be used or where final stabilization will be achieved through vegetative cover
Gould Construction, lnc. will restrict vehicle and equipment access to operational areas of the site and
compacted surfaces may be ripped (i.e., surface roughened) prior to implementation of temporary and
final stabilization vegetative cover.
7. Unless infeasible, topsoil shall be preserved for those areas of a site that will utilize vegetative
final stabilization.
The oroiect's plan for meetinq the requirement: Unless determined infeasible, topsoil will be removed
and stockpiled for later use in areas of the site that will utilize vegetative final stabilization. Tab 14 of
the SWMP may include a Landscape Plan showing vegetated areas of the site for the
commercial/residential land development.
Note: See facility Reclamation, Revegetation, & Weed Management Plan for more information
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8. Minimize the amount of soil exposed during construction activity, including the disturbance of
steep slopes.
The proiect's plan for meetinq the requirement: Soil exposed during construction activity will be
minimized with construction scheduling and phasing, by stabilizing with hardscaping (e.9., compacted
gravel), with temporary stabilization control measures (e.9., vegetation, mulch, etc.) for idle (more than
14 days) areas of the site, etc. ECB will be used for slopes 3:1 and steeper and may be used for ditches
that have a grade steeper lhan 2Yo.
Note: See facility Reclamation, Revegetation, & Weed Management Plan for more information
9. Diversion GMs will minimize soil transport and erosion within the entire diversion, minimize
erosion during discharge, and minimize run-on into the diversion. The Permittee must minimize
the discharge of pollutants throughout the installation, implementation, and removal of the
diversion. Diversions must meet one of more of the conditions listed in the Permit.
The proiect's plan for meetinq the requirement: This control measure is not applicable to the West
Glenwood Property permitted facility. State waters will not be diverted.
10. Bulk storage, 55 gallons or greater, for petroleum products and other liquid chemicals must
have secondary containment, or equivalent protection, in order to contain spills and to prevent
spilled materialfrom entering State waters.
The oroiect's plan for meetinq the: As needed, Gould Construction, lnc. will use secondary containment,
or equivalent protection, for the bulk (55 gallons or greater) storage of petroleum products and other
liquid chemicals at the site. Secondary containment structures may be lined earthen berms, lined
retaining walls, double-walled fuel tanks, drip pans, etc. This is not anticipated for the facility.
11. Control measures designed for concrete washout waste must be implemented. This includes
washout waste discharged to the ground as authorized under the Permit and washout waste
from concrete trucks and masonry operations contained on-site. The Permittee must ensure the
washing activities do not contribute pollutants to stormwater runoff or receiving waters.
Discharges that may reach groundwater must flow through soil that has buffering capacity prior
to reaching groundwater, as necessary to meet the effluent limitations in the Permit. The
concrete washout location will not be located in an area where shallow groundwater may be
present and would result in buffering capacity not being adequate, such as near natural
drainages, springs, or wetlands. The Permit authorizes discharges to the ground of concrete
washout wastes, but does not authorize on-síte waste disposal.
The proiect's plan for meetinq the requirement: Gould Construction, lnc. will meet the requirements of
this control measure as described in the Permit. Control measures for concrete washout wastes may
include the use of pit excavations (lined or unlined), above ground storage areas, or prefabricated haul
away concrete washout containers. Concrete wastes will be collected and transported to designated
off-site disposal facilities. The depth to groundwater at the project site is more than 80 inches.
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12. Temporary stabilization for earth disturbing activities on any portion of a site where ground
disturbing construction activity has permanently ceased, or temporarily ceased for more than
14 calendar days.
The project's plan for meetinq the requirement: Gould Construction, lnc. will implement surface
roughening and/or temporary seeding and mulching for any portion of the site where ground disturbing
construction activity has permanently ceased or temporarily ceased for more than 14 calendar days. lf
the requirements of this control measure must be exceeded the constraints necessitating the alternative
schedule, the alternate stabilization schedule, and the locations where the alternative schedule is
applicable will be documented in Tab I of the SWMP and (as applicable) on the Site Maps in Tab 7 of
the SWMP.
Note: See facility Reclamation, Revegetation, & Weed Management Plan for more information.
C. Potential Pollutant Sources & Control Measures lmplementation
Gould Gonstruction, lnc. will implement control measures at the West Glenwood Property construction site
to minimize the discharge of pollutants from potential pollutant sources. The following section lists potential
pollutant sources for the project and the selected structural and/or non-structural control measures which
may be implemented to minimize erosion, sediment transport, and the release of other pollutants related to
construction activities. Control measures implemented in the field will be designed to prevent pollution or
degradation of State waters and will be indicated on the Site Maps in Tab 7 of this SWMP.
1. Disturbed and Stored Soils
Source(s): Disturbed soils may be the result of cutting and filling, excavating, stockpiling, clearing,
grubbing, grading, and compaction of the site. Stored soils may consist of imported backfill or road
base used for grading, utility trenches, and site improvements. Potential pollutants from these
construction activities include milled asphalt, sediment, and dust.
Gontrol Measure(s): Construction phase sequencing; using earthen berms, silt fence, VTCs, seed and
mulch (for temporary stabilization); hardscaping with compacted milled asphalt and surface watering;
preserving (or not disturbing) topsoil for areas of the site that will utilize vegetative permanent
stabilization; minimizing soil compaction where infiltration control measures will be used or where
permanent stabilization will be achieved through vegetative cover (not applicable to the project); etc.
Potential presence at the West Glenwood Property facility: Yes.
2. Vehicle Trackinq of Sediments
Source(s): Vehicle tracked sediment is a potential pollutant which may result from the movement of
equipment and vehicles from on-site disturbed surfaces to off-site roads (typically paved) during
construction activities.
Control Measure(s): lmplementing VTCs at access points to mitigate the transport of mud/sediment
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adhering to vehicle tires prior to leaving the site and entering the adjacent roads or immediately
removing tracked sediment from off-site roads.
Potential presence at the West Glenwood Property facility: Yes
3. Manaqement of Contaminated Soils
Source(s): No contaminated soils are known to exist on-site. Soils may become contaminated with
leaks and spills from vehicle fuels, hydraulic and other vehicle lubricants and fluids, and materials
entering the site during construction.
Control Measure(s): lf encountered, temporarily storing contaminated soils in the construction
materials storage area shown on the Site Maps (Tab 7 of the SWMP) until properly disposing of in
accordance with Local (Garfield County) and/or State (CDPHE) guidelines.
Potential presence at the West Glenwood Property facility: Yes, for soils to become contaminated
during active construction.
4. Loadinq and Unloadinq Operations
Source(s): Loading and unloading operations during construction material delivery and removal of
construction wastes from the site have the potential to spill materials that may contribute sediment,
nutrients, metals, oil and grease, and organics to stormwater runoff.
Control Measure(s): Designating areas for loading and unloading; loading and unloading materials in
a manner to reduce the likelihood of spills, providing spill kits and determining appropriate measures to
mitigate spills for the delivery of materials and supplies that cannot be made in designated construction
materials storage areas, etc.
Potential presence at the West Glenwood Property facility: Yes
5. Outdoor Storaqe Activities
Source(s): The outdoor storage of building materials, fertilizers, chemicals, etc. has the potential to
contaminate stormwater from spills and leaks of these materials and from stormwater coming into
contact with them. Stormwater pollutants from outdoor storage activities include sediment, nutrients,
trash, metals, oil and grease, and organics.
Gontrol Measure(s): Storing fertilizers or chemicals in the construction materials storage area, storing
project materials in the same construction materials storage area, containing outdoor storage areas
(with, for example, silt fence, sediment control logs, temporary berms, etc.); etc.
Bulk (55 gallons or greater) storage for petroleum products and other liquid chemicals shall have
secondary containment, or equivalent protection. The location(s) of outdoor storage activities can be
found on the Site Maps in PartT of this SWMP.
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Potential presence at the West Glenwood Property facility: Yes
6. Vehicle and Equipment Maintenance and Fuelinq
Source(s): Vehicle and equipment maintenance and fueling activities have the potential to contribute
trash, metals, oil and grease, and organics to stormwater runoff during all phases of construction
activity.
Control Measure(s): Construction equipment shall not have leaking fluid or hydraulic hoses and fueling
equipment shall have automatic shut-off valves to prevent overfilling and potential spills. Bulk storage
of petroleum products and other liquid chemicals shall have secondary containment, or equivalent
protection. The location of vehicle and equipment maintenance and fueling will be shown on the Site
Maps in ParI7.
Potential presence at the West Glenwood PropeÉy facility: Yes.
7. Siqnificant Dust or Pafticulate Generatinq Processes
Source(s): Significant dust or particulates may be generated during eafth-disturbing construction
activities (i.e., cutting/filling, excavating, grading, moving equipment and supplies, etc.).
Control Measure(s): Periodically spraying stockpiles of stripped materials with water or a crusting
agent to stabilize potentially wind-blown material, tarping trucks hauling import fill materials to control
airborne dust, suspending or limiting construction activity during high wind events (20 to 30 MPH
sustained) if dust cannot be controlled by wetting or similar means, etc.
Potential presence at the West Glenwood PropeÉy facility: Yes
8. Routine Maintenance Activities
Source(s): Routine maintenance activities have the potential to contribute trash, metals, oil and grease,
and organics to stormwater runoff during all phase of construction activity.
Gontrol Measure(s): Designating areas for maintenance activities involving potential pollutants that
could spill, storing liquids and chemicals in secondary containment, training personnel in the proper
use and storage of materials, etc.
Potential presence at the West Glenwood Property facility: Yes.
9. On-site Waste Manaqement Practices
Source(s): On-site waste management practices may generate waste piles and liquid wastes during
all phases of construction. Potential stormwater pollutants associated with this source include sediment,
nutrients, trash, metals, bacteria, oil and grease, and organics.
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Control Measure(s): Storing and covering on-site wastes within designated storage areas, keeping
waste collection areas clean, inspecting solid waste containers for leaks, emptying trash and bulk
waste-collection dumpsters before they are full and overflowing, cleaning up litter and debris from
construction sites daily, etc.
Potential presence at the West Glenwood Property facility: Yes.
10. Concrete Truck/ Equipment Washinq
Source(s): Waste concrete and concrete wash water are potential pollutants that may be generated
during construction activities at the West Glenwood Property construction site. Potential pollutants
associated with this source include metals, pH, sediment, etc.
Gontrol Measure(s): Concrete washout areas shall be identified in the field and maintained (i.e.,
cleaned-out) as necessary to maintain capacity for additional concrete waste washouts; washout
activities shall be completed within contained areas using lined straw bales, eafthen berms, etc. to keep
the pollutants away from stormwater runoff or receiving waters; discharges that may reach groundwater
shall flow through soil with a buffering capacity prior to reaching groundwater; hardened concrete
wastes on the ground shall be picked up and disposed of properly each day; at project end all concrete
wastes shall be removed from the site and disposed of at an approved waste disposal facility.
Potential presence at the West Glenwood Property facility: Yes.
11. Dedicated Asphalt. Concrete Batch Plants, and Masonrv Mixinq Stations
Source(s): Concrete and asphalt batch plants, masonry mixing stations, and borrow or fill areas that
produce earthen materials (e.9., soils, sands, and gravel) for project sites have the potential to
contribute pollutants to stormwater discharges from these dedicated stations.
Control Measure(s): No asphalt or concrete batch plants or masonry mixing stations are planned for
use.
Potential presence at the West Glenwood Property facility: No
1 2. Non-lndustrial Wastes
Source(s): Non-industrialwastes generated during active construction may include, but not be limited
to worker trash, portable toilets, discarded construction materials, etc. Non-industrial wastes may be
generated during all phases of construction and have the potential to adversely affect water quality.
Pollutants from these sources include sediment, nutrients, trash, metals, bacteria, oil and grease, and
organics.
Gontrol Measure(s): Keeping the construction site clean and orderly; routine disposal of trash,
construction site wastes, sanitary wastes, etc.; recycling or disposing of materials and/or fluids properly;
providing waste disposal receptacles at the site and requiring that construction trash, debris, and
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wastes be disposed of in a proper manner; personnel training in good housekeeping practices; securing
portable toilets to the ground to prevent tipping; locating away from stormwater conveyances; etc.
Potential presence at the West Glenwood Property facility: Yes
13. Other Areas/ Procedures Where Spills Can Occur
Source(s): No other areas or procedures where potential spills can occur have been identified at this
time,
ControlMeasure(s): NA
Potential presence at the West Glenwood Property facility: NA. As needed, this section will be
updated to include new potential pollutants identified during active construction.
D. Documented Use Agreement for Measures Located Outside of Permitted Area
lf needed, the West Glenwood Property SWMP will include (in Appendix C, Tab 12) a Documented Use
Agreement between Gould Construction, lnc. (Permittee) and the owner or operator of any control
measures located outside of the permitted area utilized by the construction site for compliance with the
Permit, but not under the direct control of the Permittee. lf applicable, the Gould Construction, lnc. will be
responsible for ensuring that all control measures located outside of the permitted area and being utilized
for the construction site are properly maintained and in compliance with all terms and conditions of the
Permit. The SWMP will include all information required of and relevant to any such control measures located
outside the permitted area, including location, installation specifications, design specifications, and
maintenance requirements.
Summit Services Group, LLC Denver, CO
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:l
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.stnrrrnryaåer Maffiæir¡re.{Tt: Fla¡ fSWMP}
TAB 6
SITE DESCRIPTION
.)Summif&'rvfeês Ëroup, LLC DênvêL CO'$¡n¡¡'¡s4p¡@ru$upm
1-80&64&7:087
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMp)
6. SITE DESCRIPTION ($l.G.2.a.vii)
A. Nature of the construction activitv at the site
West Glenwood Property is a non-structural and commercial development west of the City of Glenwood
Springs. The initial phase of construction was to use the site as a staging area for the Cedar Crest
lmprovements (ClP) (COR408982) project as the land was being developed for proposed commercial
uses. Because the construction boundaries for the CIP infrastructure project were limited, the West
Glenwood Property was used to stage its equipment, materials (e.9., milled asphalt spoils), and
supplies. With completion of the Cedar Crest lmprovements project, the West Glenwood Property will
be (partially) reclaimed, revegetated, and developed to include a mini-storage facility. See the facility
Reclamation, Revegetation, & Weed Management Plan for more information.
Land Development
Land development construction activities may include clearing and grubbing existing vegetation; overlot
grading; trenching, stockpiling, and backfilling for utility installations and/or tie-ins; excavating and
stockpiling for building (storage unit) foundations; construction of pavement sections (e.9., foundations,
asphalt milled surfaces, etc.); surface gravelling; and construction of a long-term stormwater
management detention basin with drainage swale, piping, and stabilized outfall.
Note: Erosion and/or sediment control measures will be implemented prior to ground disturbing
construction activities and remain in place during subsequent phases of construction.
Vertical Construction
Vertical construction activities may include but may not be limited to paving/hardscaping for
foundations, materials and equipment staging, vertical construction, stormwater control measures
installation and management, and landscaping.
B. Proposed schedule for the sequence for maior construction activities
As needed, the following table will be updated and/or revised to reflect current construction schedules and
on-site construction activities. The dates included are subject to change as the project nears
commencement.
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PROPOSED SCHEDULE FOR MAJOR CONSTRUCTION ACTIVITES
Gonstruction Activity Proposed
Start Date End Þate Notes/Comments
1. Pre-Disturbance CMs April2022 VTC, existing earthen berm, etc.
2. Grading
West Glenwood Property
Gould Construction, lnc.
Stormwaier Management Plan (SWMp)
PROPOSED SCHEÐULE FOR MAJOR CONSTRUCTION ACTIVITES
Construction Activity Proposed
Start Date End Date Notes/Gomments
3. Land Development
4. Utilities
5. Vertical Construction
6. Final Stabilization/Landscaping
7. Remove CMs
8.
Construction activities at the site will follow standard construction and engineering protocols and
procedures, and appropriate stormwater runoff, erosion, and sediment control measures (CMs) shall be
used to minimize the impact of earth disturbing activities. To effectively minimize site erosion and sediment
transport during construction, the following sections describe the relationship between the phases of
construction, and the implementation and maintenance of both structural and non-structural stormwater
management CMs used for the project.
1. Pre-construction (lnitial Phase)
Preliminary site assessments were made to determine needed site-specific CMs, pre-construction
vegetative cover, and existing drainages/outfalls. These features were incorporated into a site-specific
erosion control map and were used to develop the project SWMP. The West Glenwood Property SWMP is
a dynamic document that shall continuously be used and modified during the project as construction
progresses and changes in site conditions warrant.
Prior to initial construction activities or ground disturbances, measures shall be implemented at the site for
safety and to delineate project boundaries (e.9. construction fence as needed), to control erosion (i.e.,
sequencing of construction activities) and sediment (i.e., earthen berm), and to protect dedicated existing
vegetation and structures.
2. Construction (lnitialand lnterim Phases)
The matrix on the following page may be used to select control measures for the project when the phase
(e.9., initial, interim, final) of construction activity has been determined. Control measures (CMs) will be
installed prior to, during, and immediately following construction with consideration given to safety, access,
operational constraints, and ground conditions at the time of construction. Site preparation CMs will be
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installed before ground disturbing activities, and as construction activities progress additional measures
may be implemented to adequately control each pollutant source at the West Glenwood Propefty facility.
Upon completion of ground disturbing construction, long-term or permanent control measures (e.9.,
stabilized surfaces, vegetation, etc.) will be implemented and maintained by the Permittee (i.e., Owner).
3. Post-construction(Final Phase)
Sediment and erosion control measures shall be maintained andior modified as needed until final
stabilization is achieved; and site-specific maps shall be updated to reflect field conditions post-
construction. After construction activities have been completed and final stabilization is achieved (with, for
example, hardscaping and vegetation), all temporary non-biodegradable CMs shall be removed from the
site and the appropriate forms (e,9., Notice of Termination) shall be completed and sent to the applicable
regulatory agencies for termination of active permits. Final stabilization control measures for the project,
including hardscaping and vegetation, have been designed and will be installed as permanent features.
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Potential Control Measure (CM)lnitial Fhase lnterim
Phase FinalPhase
goÊ{,(!5
Eıoù
Permanent Vegetation X
Concrete, Asphalt Pavement, Gravel X X X
Detention Pond/Sediment Basin X X
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Earth Dike and Drainage Swales X X X
Silt Fence X X
Temporary Outlet Protection (to be permanent)X X
Rolled Erosion Control Products X X
Vehicle Trackinq Controls X X
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Stabilized Staging Area
Street Sweeping X X
Surface Roughening X
Temporary Vegetation X
Mulching X
Dust Control X X
Concrete Washout Area X
Stockpile Management X X
Good Housekeeping Practices X X X
Construction Phasing X X X
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan {SW[llp)
C. Estimate of Total Site Acreaqe & Acreaqe to be Disturbed
The West Glenwood Property construction site is primarily in the Northeast % of Section 1, Township 6
South, Range 90 West of the Sixth Meridian. The latitude and longitude for the site is:
Latitude: 39.561669 Longitude: -107.384629
1. Total area* of construction site: approximately 10.0 acres (8.34 acres for proposed phase)
2. Total area* of disturbance: approximately 10.0 acres (8.34 acres for proposed phase)
*Note: The Permit Certification will be modified to include the new project area (in addition to the existing
Permit coverage area of 3.0 acres, not including -1.5 acres of overlap).
Off-site Disturbance: There are no off-site activities associated with this project, and there are no planned
off-site borrow or disposal activities associated with the project. Should off-site disturbances occur or
become necessary, the SWMP and Site Maps (Tab 7) shall be amended by the Qualified Stormwater
Manager (noted in Tab 1) to reflect these changes.
Orï-s¡fe Flows: Off-site flows are not expected to change with the proposed 14,000 cubic feet of storage
provided by the detention pond and outfall structure. Pre-construction, the project area did not have a
designed stormwater drainage system to control runoff and site surfaces generally sloped to the south. The
permitted facility is at the base of Storm King Mountain, and may be influenced from stormwater run-on
from slopes above the site.
D. Soils Description
A formal soils study was not conducted at the West Glenwood Property project location. However, soil types
were evaluated using data obtained from the United States Department of Agriculture (USDA), Natural
Resources Conservation Service (NRCS), Web Soil Survey (WSS). A Custom Soil Resource Report for the
project is located in Appendix F (Tab 15) of this SWMP.
Contaminated soils are not expected to be present on site or disturbed during construction activities, and
groundwater contamination located within site boundaries is not anticipated nor expected to be pumped
during active construction.
So/ Iypes:
The primary soil type for the project area is the Atencio-Azeltine complex (parent material: mixed alluvium
derived from sandstone and shale), Hydrologic Soil Group B, 1 to 3 percent slopes. The Atencio-Azeltine
complex is well drained, has a low to very low runoff potential, and the depth to water table in the project
area is more than 80 inches.
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So/ Eroslon Potential:
Soil at the West Glenwood Property project site is susceptible to erosion and stormwater runoff by varying
degrees. Typically, soils high in clay content have low K values (low potential for erosion) and soils with
high silt content are the most erodible. The NRCS rates erosion potential on a scale of 0.02 (not highly
erodible) to 0.69 (extremely erodible). Runoff potentials are dependent upon meteorological factors (e.9.,
type of precipitation, rainfall intensity, rainfall amount, rainfall duration, etc.) and physical characteristics
(e.9., vegetation, soil type, drainage area, slope, topography, etc.) of a site. The Atencio-Azeltine complex
has a K-value of 0.17 and is slightly susceptible to erosion by stormwater.
Wind Erodibility:
A soil's wind erodibility rating indicates its susceptibility to erosion by wind. Soils are assigned to groups
that have similar properties affecting their susceptibility to wind erosion, with Group 1 soils being the most
susceptible and those assigned to Group 8 being the least. The Atencio-Azeltine complex has a wind
erodibility group rating of 3, indicating a moderately high susceptibility to erosion by wind.
E. Existinq Veqetation Description
Prior to the proposed phase of the project, the West Glenwood Property facility was undeveloped. The pre-
disturbance surface vegetative cover was forty-five to sixty percent (45-60%) and included grasses, trees,
shrubs, and other plant types native to the area. lt appears native tree cover may have been removed from
the west half of the site in recent history. On a side note, in 1994 the South Canyon wildfire on Storm King
Mountain above the project site killed 14 firefighters (mostly from Prineville, Oregon).
The method used for determining the percentage of existing vegetative ground cover relative to the entire
site was a visual (i.e., ocular) estimate of plant cover on site surfaces. The project area is bounded to the
north by private and Federal undisturbed (native trees may have been removed within the last 50 years)
lands, to the east/NE and west by rural residential land uses, and to the south by the lnterstate 70 and
Highway 6 and 24 corridors.
F. Allowable Non-stormwater Discharges
The table on the following page shall be completed/updated as needed during construction.
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ALLOWABLE NON€TORMWATER DISCHARGES
Type Exist?
Y/N Description
Discharges of uncontaminated springs N Uncontaminated springs are not located on-site
Discharges to the ground of concrete
washout water
Discharges to the ground of concrete washout
water during active construction with CMs.
West Glenwood Property
Gould Construction, lnc.
$tarmwater h/anagement Plan {$WlU p)
ALLOWABLE NON.STORMWATER DISCHARGES
Type Exist?
Y/N Description
Discharges of landscape/agricultural
irrigation return flow N
The site does not have landscape/agricultural
return flows.
Emergency fire fighting N^/Fire-fighting a potential
Discharges covered by the Low Risk
Discharge Guidance Policy - WQP 27 N Groundwater dewatering not anticipated
G. Areas Receivinq Discharqe from the Site
1. Outfall Location:approximately latitude 39.561686 and longitude -107.380910
2. lmmediate Receiving Waters: Unnamed sudace drainages of the Colorado River east of the proposed
construction site.
3. Ultimate Receiving Water: Colorado River, approximately 500 feet south
4. According to FEMA FIRM Panel 08020514308, the site lies within an area with no Digital Data
Available.
5. Discharges to Outstanding Waters: No (A map of Colorado's outstanding waters is available at:
https ://www.colorado.qov/pacif ic/cd phe/clean-water-q is-ma ps)
6. lmpaired waters or waters subject to TMDLs: No
H. Stream Crossinqs Located within the Gonstruction Site Boundarv
1. There are no stream crossings or defined wetlands located within the construction site boundary.
2. The site does not have pre-existing vegetation or equivalent control measures within 50 horizontal feet
of receiving waters.
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TAB 7
SITE MAP
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7, SITE MAP ($l.G.2.a.viii)
This SWMP includes legible site maps showing the entire site, identifying
A. Construction site boundaries;
B. Flow arrows depicting stormwater flow directions on-site and runoff direction;
C. All areas of ground surface disturbance, including areas of borrow and fill;
D. Areas used for storage of soil;
E. Locations of all waste accumulation areas, including areas for liquid, concrete, masonry, and asphalt;
F. Locations of dedicated asphalt, concrete batch plants and masonry mixing stations;
G. Locations of all structural control measures;
H. Locations of all non-structural control measures (e.9., temporary stabilization);
l. Locations of springs, streams, wetlands, diversions, and other State waters;
J. Locations of all stream crossings located within the construction site boundary; and
K. Locations where alternative temporary stabilization schedules apply.
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Ø:g:*gif xr":**,låî,^Areas used for storage of soilwill be indicated on the map.A CWA wlll þe lndlcated on themap before beirg lmplernentedln the field.A uniform cover of at leasl 70% of pre-exist¡ngconditions will be met prior to perm¡t teminatlon.No temporary CMs will remain in place during ûreprocess of ftnal stabilization.Locations of waste accumulationareas will be indicated on themap as needed.@oo-cv)oc:I\\When known, areas of grounddisturbance will be shown onthe map.reIAs needed, a WC will beused at the site access.Leoend: Symbols on maos not to scaleLimits of Construction/Disturbance @ Active construct¡onDrainageswale @ I concretewashoutArea@Vehicle Tracking Conkol @ a port_O_Let @ <--lnlet Protection @ I Dumpsler @Rocksocks @Construction Fence @Flow DirectionSurface Roughening @. Stao¡l¡zed Staging Area @ @N Stockpile AreaCMsNot to Scale!!L Curb Rock Socks @- Silt Fence @EI6874 H¡ghway 82Glenwood Springs, CO 81601mCONSTRUCIIONSTORMWATER MANAGEMENT EC PLAN(lNlTlAL and INTERIM PHASES)Gameld CountyWest Glenwood Property$EETGæ€ÑUf*R;Sheet 1
Ø ly:11¡i!,::r,: s:tr,iåiiffim6874 H¡ghway 82Glenwood Springs, CO 8f601STORMWAÏER MANAGEMENT EC PLAN(lNlTlAL and INTÊRlM PHASES)Gãrf¡eld CountyWest Glenwood PropertySheet 2Leoend: Svmbols on maos not to scaleLimits of ConstructioniDisturbance @ Active ConstructionDrainageswale @ I concretewashoutArea@VehicleTrackingControl @ O port-Glet @ <-lnlet Protection @ f Dumpster @' Stabilized Staging Area @ @| Stockpile AreaFlow DirectionSurface Roughening <Ð>Rocksocks @Construction Fence @cMsNot to Scaleuçu Curb Rock Socks @- Silt Fence @EIA uniform cover of at least 70% of pre.existingconditions will be m6t prior to permit termination.No temporary CMs will remain in place during theprocess of final stabilization.Areas usêd for storage of soilwill be indicated on the map.Locations of waste accumulationareas will bo indicated on themap as needed.This 3.0 acres initiallydeveloped in phase 1 ofconstruct¡on.This 3.0 acres initiallydeveloped in phase 1 ofconstruction.As needed, a VTC will beused at the site access.
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TAB 8
FIIIIAL STABILIUATIOH AHTT L6N,G-TERM STf'R[fiUfA:TER
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West Glenwood Property
Gould Construction, lnc.
$tormwater Managemeni Plan ($WMp)
8.FINAL STABILIZATION AND LONG.TERM STORMWATER MANGEMENT
($l.G.2.a.ix)
A. Description of Final Stabilization Measures
Final stabilization of all disturbed areas at the West Glenwood Property construction síte is required by the
Permit after construction activities have been completed. See the facility Reclamation, Revegetation, &
Weed Management Plan for more information.
Final stabilization measures for obtaining a vegetative cover or alternative stabilization methods include but
may not be limited to native seed mix selection and application methods; soil preparation and amendments;
soil stabilization methods (e.9., use of erosion control blanket for steep slopes); appropriate sediment
control measures as needed untilfinal stabilization is achieved; permanent pavement and stabilized driving
sudaces; and other alternative stabilization practices as applicable.
1. Final Stabilization Measures for the West Glenwood Property facility
Final stabilization has been designed and will be installed as a permanent feature. Final stabilization
measures for obtaining a vegetative cover, or alternative stabilization methods, for the project may include,
but not be limited to:
Minimizing soil compaction for areas where infiltration control measures will occur or where final
stabilization will be achieved through vegetative cover;
Stripping topsoil and stockpilíng for later re-use;
lnstallingiutilizing an irrigation system for permanent vegetation;
Preparing seed beds with soil roughening and soil amendments, as needed;
Planting deciduous trees, evergreen trees, deciduous shrubs, evergreen shrubs, perennial plants,
ornamental grasses, etc. ;
Drill seeding/hydro-seeding non-irrigated native grass seed and applying crimped straw mulch
and/or hydro-mulch;
Using permanent gravel (and/or pavement) for access roads, driveways, and parking; and
lmplementation of appropriate sediment control measures (i.e., silt fence, SCLs, ECB, etc.) as
needed until final stabilization is achieved.
As needed, this section shall be updated to reflect changes to proposed final stabilization control measures
to be implemented for the facility.
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a
a
a
a
a
a
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West Glenwood Property
Gould Construction, lnc.
Stormwater ManagemenT Plan {SWMp}
2. Final Stabilization Achievement ($l.B.1.a.iiil
Final stabilization is achieved when all construction activities at the site have been completed, permanent
stabilization methods are complete, and all temporary CMs have been removed from the site, except when
the control measure specification allows the CM to be left in place.
Soil compaction shall be minimized for areas where infiltration control measures will be implemented or
where final stabilization will be achieved through vegetative cover; unless infeasible, topsoil shall be
preserved for areas of the site utilizing vegetation for final stabilization.
Areas being stabilized with a vegetative cover must have evenly distributed perennial vegetation. The
vegetation coverage must be, at a minimum, equal to 70 percent of what would have been provided by
native vegetation in a local, undisturbed area or adequate reference site.
3. Lonq-term Stormwater Manaqement
Long-term stormwater management (i.e., erosion and sediment control) for the West Glenwood Property
facility will be achieved using post-construction stormwater control measures, including, but not limited to
surfaces stabilized with hardscaping (e.9., roadbase/gravel), permanent vegetation, a stabilized eadhen
berm with drainage swale, and detention pond with piped and stabilized outfall.
4. Temporarv Stabilization
Temporary stabilization will be implemented for earth disturbing activities on any portion of the site where
ground disturbing construction activity has permanently ceased, or temporarily ceased for more than 14
calendar days. Temporary stabilization methods may include, but are not limited to the use of tarps, soil
tackifier, surface roughening, and hydro-seed/mulch.
Gould Construction, lnc. may exceed the 14-day temporary stabilization schedule when either the function
of a specific area of the site requires it to remain disturbed, or physical characteristics of the terrain and
climate prevent stabilization. As needed, the SWMP will document (in the table below) the constraints
necessitating the alternative schedule, provide the alternate stabilization schedule, and identify all locations
where the alternative schedule is applicable on the Site Maps (Tab 7).
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TEMPORARY STABILIZATION ALTERNATIVE SCHEDULE
Gonstraints Necessitating
Alternative Schedule
Altemate
Stabilization Date
Location{s} Where Altemative Schedule
is Applicable (also shown on Site Maps)
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West Glenwood Property
Gould Construction, lnc.
$tormwater l\rlanagement Flan {SWMp)
9. INSPECTION REPORTS (Sl.C.2.a.xl
A. lnspection and Maintenance Procedures
Site inspections shall be conducted in accordance with State regulations as detailed in the Permit. The
requirements are detailed in this section of the stormwater management plan (SWMP) as specifíed in Part
1.D of the State Permit and represent the minimum inspection schedule for the West Glenwood Property
construction site. Gould Construction, lnc. (Permittee) is responsible for implementing and maintaining
control measures in good and effective operating condition for the site. More frequent inspections may be
needed to ensure that implemented control measures (CMs) function as designed and implemented.
1. Person Responsible for Conducting lnspections
The person(s) inspecting the site may be on the staffs of Gould Construction, lnc. or a third pafty hired to
conduct stormwater inspections under their direction. Gould Construction, lnc. is responsible for ensuring
the inspector (noted in Tab 1) is a Qualified Stormwater Manager.
2. lnspection Frequencv
Gould Construction, lnc. will ensure inspections are conducted in accordance with one of the following
minimum frequencies, unless the West Glenwood Property construction site/project meets the
requirements of Part 1.D.4 of the State Permit.
At least one inspection every 7 calendar days; Or
b. At least one inspection every 14 calendar days, if post-storm event inspections are conducted
within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion.
Post-storm inspections may be used to fulfill the 14-day routine inspection requirement.
Anticipated when construction commences.
c. When site conditions make the schedule required in this section impractical, the Permittees may
petition the Division to grant an alternate inspection schedule. The alternative inspection schedule
must not be implemented prior to written approval by the division and incorporation into the SWMP.
3. lnspection Frequencv for Discharqes to Outstanding Waters
Gould Construction, lnc. will ensure inspections are conducted at least once every 7 calendar days if it is
determined that the West Glenwood Property site discharges stormwater to a water body designated as an
Outstanding Water by the Water Quality Control Commission.
Note: As of 311512022 the project area was not located in an area with Outstanding Waters. (Source:
https ://www.colorado.qov/pacific/cd phe/clean-water-q is-maps)
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4. Reduced lnsoection Frequencv
Gould Construction, lnc. may perform site inspections at the following reduced frequencies when one of
the following conditions exists for the project:
a. Post-Storm lnspections at Temporarilv ldle Sites
For Permittees choosing to combine 14-day inspections and post-storm-event-inspections, if no
construction activities will occur following a storm event, post-storm event inspections must be
conducted priorto re-commencing construction activities, and no laterthan 72 hours following the storm
event. The delay of any post-storm event inspection must be documented in the inspection record.
Routine inspections must still be conducted at least every 14 calendar days.
For Permittees choosing an inspection frequency pursuant to Part l.D.2.b and if no construction
activities will occur following a storm event, post-storm event inspections must be conducted prior to
re-commencing construction activities, and no later than 72 hours following the storm event. lf the post-
storm event inspection qualifies under this section, the inspection delay must be documented in the
inspection record per Part 1.D.5.c. Routine inspections must still be conducted at least every 14
calendar days.
b. lnspections at Completed Sites/Areas
When the site, or portions of the site are awaiting establishment of a vegetative ground cover and final
stabilization, Gould Construction, lnc. will conduct a thorough inspection of the stormwater
management system at least once every 30 days. Post-storm event inspections are not required under
this schedule. This reduced inspection schedule is allowed if all of the following criteria are met:
1) all construction activities resulting in ground disturbance are complete;
2) all activities required for final stabilízation, in accordance with the SWMP, have been completed,
with the exception of the application of seed that has not occurred due to seasonal conditions or
the necessity for additional seed application to augment previous efforts; and
3) the SWMP has been amended to locate those areas to be inspected in accordance with the
reduced schedule allowed for in the Permit.
c. Winter Conditions lnspections Exclusion
lnspections are not required if the site meets all of the following conditions: construction activities are
temporarily halted, snow cover exists over the entire site for an extended period of time, and melting
conditions posing a risk of surface erosion do not exist. This inspection exception is applicable only
during the period where melting conditions do not exist, and applies to the routineT-day,14-day and
monthly inspections, as well as the post-storm-event inspections. When this inspection exclusion is
implemented, the following information must be documented in accordance with the requirements in
Part ll of the Permit:
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dates when snow cover existed;
date when construction activities ceased; and
date melting conditions began.
5. lnspection Scope
a. Areas to be lnspected
At a minimum, the following shall be evaluated during each inspection for evidence of, or the potential
for, pollutants leaving the construction site boundaries; entering the stormwater drainage system; or
discharging to State waters (Colorado River):
1) construction site perimeter,
2) all disturbed areas,
3) locations of installed control measures,
4) designated haul routes,
5) material and waste storage areas exposed to precipitation,
6) locations where stormwater has the potentialto discharge offsite, and
7) locations where vehicles exit the site.
All erosion and sediment control measures identified in the SWMP shall be evaluated to ensure that
they are maintained and operating correctly.
b. lnspection Requirements
1) Visually verify whether all implemented control measures (CMs) are in effective operational
condition and are working as designed in their speclfications to minimize pollutant discharges.
2) Determine if there are new potential sources of pollutants.
3) Assess the adequacy of CMs at the site to identify areas requiring new or modified control
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1
2
3
PROJECT ¡NSPECTION FREQUENCY
Minimum lnspection Frequency
(e.9., 7-day, 14-day, etc.)Date Applicable Description of Qualifying Condition(s) for
lnspection Frequency
14-day with post-storm event
inspections
Determined by Permittee during active
construction to inspect at least every 14 days
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measures to minimize pollutant discharges.
4) ldentify all areas of non-compliance with the Permit requirements and, if necessary, implement
corrective action in accordance with Part 1.8.1.c.
6. lnspection Reports
lnspection reports can be found in Tab 9 of this SWMP. lnspection reports shall identify any incidents of
non-compliance with the terms and conditions of the Permit. lnspection records shall be kept along with the
SWMP for a period of three years following termination of the Permit.
At a minimum the inspection report shall include the following
a. the inspection date;
b. name(s) and title(s) of personnel making the inspection;
c. weather conditions at the time of inspection;
d. phase of construction at the time of inspection;
e. estimated acreage of disturbance at the time of inspection;
f. location(s) and identification of CMs requiring routine maintenance;
g. location(s) and identification of discharges of sediment or other pollutants from the site;
h. location(s) and identification of inadequate control measures;
i. location(s) and identification of additional control measures needed that were not in place at the
time of inspection;
j. description of corrective action(s) for items g to i above, dates corrective action(s) were completed,
and measures taken to prevent future violations, including requisite changes to the SWMP;
k. description of the minimum inspection frequency utilized when conducting each inspection;
l. deviations from the minimum inspection schedule as required in Part 1.D.2 of the Permit;
m. afteradequatecorrectiveaction(s)hasbeentaken,orwhereareportdoesnotidentifyanyincidents
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.
7. Corrective Actions
Where site inspections note the need for CM maintenance activities, CMs shall be maintained in
accordance with the SWMP and Part 1.8.1 of the Permit.
Repair, replacement, or installation of new CMs determined necessary during site inspections to address
ineffective or inadequate CMs shall be conducted in accordance with the Permit. CM repairs/changes
and/or modification shall occur as soon as possible, immediately in most cases. When an inadequate
control measure is identified, the following corrective action requirements will be applied.
a. Gould Construction, lnc. shall take all necessary steps to minimize or prevent the discharge of
pollutants, until a CM is implemented and made operational and/or an inadequate control measure
is replaced or corrected and returned to effective operating condition. lf it is infeasible to install or
repair a CM immediately after discovering the deficiency, the following will be documented and kept
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on record in accordance with the recordkeeping requirements in Part ll of the Permit.
1) Description of why it is infeasible to initiate the installation or repair immediately; and
2) A schedule for installing or repairing the control measure and returning it to an effective
operating condition as soon as possible will be provided.
lf applicable, Gould Construction, lnc. will remove and properly dispose of any unauthorized release or
discharge (e.g., discharge of non-stormwater, spill, leak, or untreated stormwater not authorized by the
Permit) within and from the permitted area. The Permittee must also clean up any contaminated surfaces,
if feasible, to minimize discharges of the material in subsequent storm events, including water remaining
from the response that contains pollutants after active emergency firefighting responses are complete. The
SWMP will be updated/noted accordingly to document the methods used to remove and properly dispose
of any unauthorized release or discharge of pollutants.
B. lnadequate Control Measures (definitionl:
"Any control measure that is not designed or implemented in accordance with the requirements of the
Permit and/or any control measure that is not implemented to operate in accordance with its design. See
also Control Measure Requiring Routine Maintenance."
1. Control Measures Maintenance
Gould Construction, lnc. will ensure that all CMs remain in effective operating condition and are protected
from activities that would reduce their effectiveness. CMs shall be maintained in accordance with good
engineering, hydrologic, and pollution control practices. Observations leading to the required maintenance
of CMs may be made during a site inspection, or during general observations of site conditions. The
necessary repairs or modifications to a CM requiring routine maintenance, as defined in Paft l.E of the
Permit, must be conducted to maintain an effective operating condition.
G. Control Measure Requiring Maintenance (definition):
"Any control measure that is stilloperating in accordance with its design and the requirements of this permit,
but requires maintenance to prevent a breach of the control measure. See also inadequate control
measure."
1. Replacement and Failed Control Measures
Adequate site assessment shall be performed as part of comprehensive lnspection and Maintenance
procedures to assess the adequacy of CMs at the site, and the necessity of changes to those CMs to
ensure continued effective performance. Where site assessment results in the determination that new or
replacement CMs are necessary, the control measures shall be installed to ensure on-going implementation
of controlmeasures as defined in Part LB of the State Permit.
Where CMs have failed, resulting in non-compliance with Part 1.8.1 of the Permit, they shall be addressed
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to minimize the discharge of pollutants. When new control measures are installed, or CMs are replaced,
the SWMP shall be updated accordingly.
D. Terms and Conditions
1. Reportinq (Sll.L)
The Colorado Department of Public Health and Environment (CDPHE) reserves the right to request
reporting for a given site. Terms and conditions are at the discretion of the CDPHE. No reporting
requirements are anticipated for the West Glenwood Property construction site.
2. SWMP Availabilitv ($1.C.4)
A copy of the stormwater management plan (SWMP) shall be retained on-site unless another location,
specified by the Permittee (Gould Construction, lnc.), is approved by the Division. The Permit provides
flexibility in allowing on-site SWMPs to be retained in an electronic or hardcopy format.
The SWMP for this project will be located
Location (e.9.,
construction trailer)Address Contact lnformation
A copy of the SWMP shall be provided upon request to the EPA, CDPHE, Garfield County, or any agency
in charge of approving sediment and erosion control plans, grading plans, or stormwater management
plans, and within a time frame specified in the request. lf the SWMP is required to be submitted to any of
these entities it shall include a signed certification in accordance with Part l.A.3.b of the Permit, certifying
that the SWMP is complete and meets all Permit requirements.
3. SWMP Review and Revisions ($1.C.3)
Changes to the SWMP shall be made prior to changes in site conditions except as indicated below.
Examples of SWMP revisions may include but are not limited to potential pollutant source identification;
selection of appropriate CMs for site conditions; CM maintenance procedures; and interim and final
stabilization practices. The SWMP changes may include a schedule for further control measure design and
implementation, provided that, if any interim CMs are needed to comply with the Permit, they are also
included in the SWMP and implemented during the interim period.
The SWMP shall be amended when
a. There is a change in design, construction, operation, or maintenance of the site which would require
the implementation of new or revised CMs; or
b. The SWMP proves to be ineffective in achieving the general objectives of controlling pollutants in
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stormwater discharges associated with construction activity; or
c. CMs identified in the SWMP are no longer necessary and are removed; or
d. When corrective actions are taken on-site that result in a change to the SWMP
For SWMP revisions made prior to or following a change(s) on-site, including revisions to sections
addressing site conditions and CMs, a notation shall be included in the SWMP that identifies the date of
the site change, the CM removed, or modified, the location(s) of those CMs, and any changes to the control
measure(s). Gould Construction, lnc. will ensure the site changes are reflected in the SWMP and will be
considered noncompliant with the Permit until the SWMP revisions have been made.
A SWMP amendment log is available in Appendix D (Tab 13) of this SWMP to track SWMP changes. The
use of the amendment log is optional, and changes may also be made directly in the SWMP.
4. Responsive SWMP Chanqes
SWMP changes addressing CM installation and/or implementation are often required to be made in
response to changing conditions, or when current CMs are determined ineffective. The majority of SWMP
revisions to address these changes can be made immediatelywith quick in-the-field revisions to the SWMP.
ln the less common scenario where more complex development of materials to modifi7 the SWMP is
necessary, SWMP revisions shall be made in accordance with the following requirements:
a. shall be revised as soon as practicable, but in no case more than 72 hours after the change(s) in
CM installation and/or implementation occur at the site; and
b. A notation shall be included in the SWMP prior to the site change(s) that includes the time and date
of the change(s) in the field, an identification of the CM(s) removed or added, and the location(s)
of those CMs.
5. Proper Operation and Maintenance ($ll.E)
Gould Construction, lnc. will at all times properly operate and maintain allfacilities and systems of treatment
and control (and related appurtenances)that are installed or used to achieve compliance with the conditions
of the Permit. As needed, proper operation and maintenance also includes adequate laboratory controls
a nd appropriate q uality assurance proced u res.
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CONSTRUCTION STORMWATER SITE INSPECTION REPORT
Facitity Name Permittee
Date of lnspection Weather Conditions
Permit Certification #Disturbed Acreaqe
Phase of Construction lnsÞector Title
lnspector Name
ls the above inspector a quatified stormwater manager?
(permittee is responsibte for ensuring that the inspector is a quatified stormwater manager)
YES NOnn
INSPECTION FREQUENCY
Check the box that describes the minimum inspection frequency utitized when conducting each inspection
At least one inspection every 7 calendar days !
At least one inspection every 14 catendar days, with post-storm event inspections conducted within
24 hours after the end of any precipitation or snowmett event that causes surface erosions tr
. This is this a post-storm event inspection. Event Date:tr
Reduced inspection frequency - lnctude site conditions that warrant reduced inspection frequency tr
¡ Post-storm inspections at temporarily idte sites tr
. lnspections at completed sites/area tr
¡ Winter conditions exctusion tr
Have there been any deviations from the minimum inspection schedule?
lf yes, describe betow.
YES NO
tr tr
INSPECTION REQU¡REMENTST
i. Visuatty verify al[ imptemented control measures are in effective operational condition and are working as
designed in the specifications
sources of tantsre are newtii. Determine
iii. Assess the adequacy of control measures at the site to identify areas requiring new or modified control measures
to minimize potlutant discharges
iv. ldentify atl areas of non-comptiance with the irements, and if necessary, imptement corrective action
*Use the attached Control Measures Requiring Routine Maintenance and lnadequate Control Measures Requiring
Corrective Action forms to document results of this assessment that trigger either maintenance or corrective actions
AREAS TO BE ¡NSPECTED
ls there evidence of,or the potential for, pottutants leaving the construction site boundaries, entering the stormwater
drainaqe svstem or discharqinq to state waters at the fottowing locations?
NO YES
lf "YES" describe discharge or potential for discharge below.
Document retated maintenance, inadequate control measures
and corrective actions lnadequate Control Measures
Requiring Corrective Action form
Construction site perimeter L]tr
At[ disturbed areas u tr
Designated hauI routes tr tr
Material and waste storage areas
exÞosed to precipitation tr
Locations where stormwater has the
potential to discharqe offsite tr
Locations where vehictes exit the site tr tr
Other:
CONTROL MEASURES REQUIRING ROUTINE MAINTENANCEDefinition: Any contro[ measure that is sti[[ operating in accordance with its design and the requirements of the permit, but requires maintenance to prevent abreach of the control measure. These items are not subject to the corrective action requirements as specified in Part l.B.1.c of the permit.Are there control measures requiring maintenance?trNOtrYESlf 'YES" document belowDateObservedLocationControlMeasureMaintenance RequiredDateCompteted
INADEQUATE CONTROL MEASURES REQUIR¡NG CORRECTIVE ACTIONDefinition: Any control measure that is not designed or imptemented in accordance with the requirements of the permit and/or any control measure that is notimplemented to operate in accordance with its design. This inctudes control measures that have not been imptemented for pottutant sources. lf it is infeasibteto instatl or repair the control measure immediatety after discovering the deficiency the reason must be documented and a schedute inctuded to return thecontrol measure to effective operating condition as possibl.e.Are there inadequate control measures requiring corrective action?trNOtrYESlf "YES" document belowAre there additional control measures needed that were not in ptace at the time of inspection?nNOtrYESlf "YES" document betowDateDiscoveredLocationDescription of lnadequateControl MeasureDescription of Corrective ActionWas deficiency corrected whendiscovered? YES/NOif "NO" provide reason and schedule to correctDateCorrected
REPORTI NG REQUI REMENTSThe permittee shatl report the foltowing circumstances oratly within twenty-four (24) hours from the time the permittee becomes aware of the circumstances,and shatl mail to the division a written report containing the information requested within five (5) working days after becoming aware of the fottowingcircumstances. The division may waive the written report required if the oral report has been received within 24 hours.b. Numeric Effluent Limit Violationso Circumstances leading to any unanticipated bypass which exceeds any efftuent limitations (See Part ll.L.6.b of the Permit)o Circumstances leading to any upset which causes an exceedance of any efftuent limitation (See Part ll.L.6.c of the Permit)o Daity maximum viotations (See Part Il.L.6.d of the Permit)Numeric effluent |ímits are very uncommon in certifications under the COR400000 general permit. This category of noncompliance only applies ifnumerîc effluent límits are included in a permít certification.a. Endangerment to Health or the EnvironmentCircumstances leading to any noncomptiance which may endanger health or the environment regardtess of the cause of the incident (See Part ll.L.6.aof the Permit)This category would primarily result from the discharge of pollutants ín violatíon of the permitAl[ Noncomliance24-HourcationPart ll.L.6 of the PermitHas there been an incident of noncompliance requiring Z4-hour notification?trNOtrYESlf 'YES" document betowDate andTime oflncidentLocationDescription ofNoncomplianceDescription of Corrective ActionDate and Time of24 Hour OralNotificationDate of 5 Day WrittenNotification **Attach copy of 5 day written notification to report. lndicate if written notification was waived, inctuding the name of the division personne[ who granted waiver
.. After adequate corrective action(s) and maintenance have been taken, or where a report does not identify
any incidents requiring corrective action or maintenance, the individuat(s) designated as the Quatified
Stormwater Manager, shatl sign and certify the betow statement:
"l verify that, to the best of my knowtedge and belief, atl corrective action and maintenance items identified
during the inspection are comptete, and the site is currentty in comptiance with the permit."
Name of Quatified Stormwater Manager Titte of QuaLified Stormwater Manager
Signature of Quatified Stormwater Manager Date
Notes/Comments
West Glenwood Property
Gould Construction, lnc.
Stcrmwater Management Plan (SWl\lp)
TAB 1O
APPENDIX A: GONTROL MEASURE DETAILS/INSTALLATION SPECIFICATIONS
Erosion Go Measures
Sediment Go Measures
C-1 S¡It Fence (SF)
G-7 Sediment Basin (SB)
Site Manaqement
Materials Manaqement
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Surface Roughening (SR)EC.1
Description
Surface roughening is an erosion control
practice that involves tracking,
scarifying, imprinting, or tilling a
disturbed area to provide temporary
stabilization of disturbed areas. Surface
roughening creates variations in the soil
surface that help to minimize wind and
water erosion. Depending on the
technique used, surface roughening may
also help establish conditions favorable
to establishment of vegetation.
Appropriate {.Ises
Surface roughening can be used to Photograph SR-l. Surface roughening via imprinting for temporary
provide temporary stabilization of stabilization'
disturbed areas, such as when
revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening
is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls.
Surface roughening is often implemented in conjunction with grading and is typically performed using
heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also
compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are
better surface roughening techniques in locations where revegetation is planned. Roughening is not
effective in very sandy soils and cannot be effectively performed in rocþ soil.
Design and Installation
Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and
SR-2, respectively.
Surface roughening should be performed either after final grading or to temporarily stabilize an area
during active construction that may be inactive for a short time period. Sutface roughening should create
depressions 2 to 6 inches deep and approximately 6 inches apaÍ. The surface ofexposed soil can be
roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the
contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or
tilling.
Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be
roughened as a subsequent operation. Roughening should follow along the contours of the slope. The
tracks left by truck mounted equipment working perpendicular
to the contour can leave acceptable horizontal depressions;
however, the equipment will also compact the soil.
Surface Roughening
Functions
Erosion Control Yes
Sediment Control No
S iteMaterial Management No
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SR-1
EC-1 Surface Roughening (SR)
Maintenance and Removal
Care should be taken not to drive vehicles or equipment over areas that have been surface roughened.
Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies.
Because surface roughening is only a temporary control, additional treatrnents may be necessary to
maintain the soil surface in a roughened condition.
Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not
provide long-term erosion control.
l
SR-2 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Surface Rough ening (SR)EC-1
2,' TQ
4" DEEP
ÏRACKING OR
IMPRINTING
FURROIVS 2,, TO 4'' DEEP
WITH 6" MAXIMUM SPACING
PARALLEL 10 CONTOURS
rOR STEEP SLOPES (3:1 OR SIEEPER)
ROUGHENEO ROWS SHALL 8E 4'' TO 6''
DEEP WITH 6,, MAXIMUM SPACING PARALLEL
TO CONTOURS
SR_2" SURFACE ROUGHENING
FOB LOW SLOPES (LESS Tlli{N 3;1)
SCARIPfING
OR ÏILLING
4" To 6"
DEEP
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SR-3
EC.1 Surface Rough enrng SR)(
SURFACE ROUGIIENING INSTALLATIÕN NOTES
1, SEE PI-AN VIE$/ FOR:
-LocAnoN(s) oF SURFACE ROUGHENING.
2. SURFACE ROUGHENING SHALL BE PÊOVIOEO PROMPTLY AFTER CÔMPLÊTION OF FINISHEO
GRADING (FOR AREAS NOT RECE|V|NG TOPSO|L) OR PRTOR TO T0PSOIL PLACEMENT OR ANY
FORECAST€D RAIN EVENT,
3. AREAS ì''/HERE EulLDlNG FOUNDATIONS, PAVEMENI, ÔR SOD wlLL ÊE PLACEO WITHOUI
DELAY IN THE CTNSÎRUCTION SÊQUENCE. SURFACE ROUCHENING IS NOT REQUIRÊD,
4. OISTURBãD SURFACES SHALL BE ROUGHËNEÐ USING RIPPINC OR TILLING EQUIPMËNT ON
THE CONTOUR OR TRACKING UP AND MWN A SLOPË USING EQUIPMENT TREADS.
5. A FÀRMING D¡SK SHÁLL NOT BE USED FOR SURFACã RÔUCHENINô.
SURFACE ROUGHENING MAINTENANSE NTTES
1. INSPECT BMPs EACl.l WôRKDAY, AND MAINTAIN TI{EM lN EFFECTIVE OPERATING CONOITION.
MAINTENANCE OF EMPg SHOULÐ BE PROACIIVE, NOT REACTIVE. INSPECT BMPS AS SOON ÀS
P055|BLE (AND ALWAY$ WtTHtN 24 HoURS) FOLLO\A/ING A SToRM THAI CAUSES SURFACE
EÊOSION, AND PERFORM NECESSARY MAINIENANCE.
2. FREQUENT OBSERVATIONS AND MAINTENÀNCE ARE NECESSARY TO MAINTAIN BMPS IN
EFFECTIVE OPERATING CONDITION, INSPECNONS AND CORRECTIVE MÊASURES SHOUTD BE
OOCUMENTED THOROUCHLY.
3. WHERE BMFs HAVE FAILED, REPAIR OR REFLACE UPON O|SCûVERY ÔF THE FAILURE.
4, VEHICLES AND EQUIPMENT SHAI*L NOT BE ORIVEN OVER AREAS THAT HAVË BEEN SURFACE
RÖUGHENEO,
5, IN NON_TURF GRASS FINISHED AREÀs, SEEDING ÀND MULCHING SHALL TAKE PLACE
DIRECTLY OVER SURFACE ROUGHENED AREAS WfijOUT FIRST SMOOTHINC OUT THE SURFACE.
6. IN AREAS NOT SÊEDED AND MULCHED AFTER SURFACE ROUGHENING, SURFACES SHALL BE
RE-ROUGHENED AS NECESSARY TO MAINIAIN GROOVE DEPTH ANÞ SMOOÎH OVER RILL
EROSION,
(0ÊfAtS ÁDiqFrEO FROM fOwN 0F P/ARKER, C0LORADÔ, NOT AVAII¡BLI lN AUIOC^D)
NOTEr MANY JURISDICIIONS HAVE BMP DEIAILS IHAT VARY FROM UDFCD STANUARD DEÏAILS
CONSULT WITH LOçAL JURISOICNONS AS TO WHICH OETAIL SHOULD BE USED WHEN
DIFFERENCES ARE NOÍED.
SR-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) ß,C-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, geotextiles,
or other appropriate measures.
Appropriate Uses
When the soil surface is disturbed and
will remain inactive for an extended
period (typically 30 days or longer),
proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order
of two weeks), techniques such as surface roughening may be appropriate. For longer periods of
inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding
should be used on finished areas that have not been otherwise stabilized.
Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional
requirements for seeding and temporary stabilization.
Design and Installation
Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of
appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric
until plants are established.
The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding
and mulching recommendations that may be referenced to supplement this Fact Sheet.
Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where
steep slopes prevent use ofdrill seeding equipment, and even in these instances it is preferable to hand
seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching.
Seedbed Preparation
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot
grading can result in loss of topsoil, resulting in poor quality
subsoils at the ground surface that have low nutrient value,
little organic matter content, few soil microorganisms,
rooting restrictions, and conditions less conducive to
infiltration of precipitation. As a result, it is typically
necessary to provide stockpiled topsoil, compost, or other
Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of
Douglas County.
Temporary and Permanent Seeding
f,'unctions
Erosion Control Yes
Sediment Control No
SiteÀ4aterial Manasement No
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
June2012 TS/PS-1
E,C-z 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 revegetated later.
Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its
water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content.
The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a
minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across
areas that will be revegetated.
Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth
medium. Organic matter, such as well digested compost, can be added to improve soil characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil
testing, which is typically inexpensive, should be completed to determine and optimize the types and
amounts of amendments that are required.
If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. ff adding
compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement
of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth.
Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose
nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth
and conducive to plant growth. Seed-to-soil contact is the key to good germination.
Seed Mix for Temporary Vegetation
To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully
landscaped or worked for an extended period (typically 30 days or more), plant an annual grass
appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver
metropolitan area are listed in Table TS/PS-l. These are to be considered only as general
recommendations when specific design guidance for a particular site is not available. Local govemments
typically specify seed mixes appropriate for theirjurisdiction.
Seed Mix for Permanent Revegetation
To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should
be established. Permanent seeding should be performed promptly (typically within 14 days) after
reaching final grade. Each site will have different characteristics and a landscape professional or the local
jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a
specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth
season listed in Table TS/PS -2 can be used. The pure live seed (PLS) rates of application recommended
in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding
equipment.
If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus
nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobara) could be
added to the upland seedmixes at0.25,0.5 and 1 pound PLS/acre, respectively. In riparian zones,
planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii),
plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled
upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source ofnitrogen
for perennial grasses.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
TS/PS-2 June2012
Tempo d Permanent Seeding (TS/PS) E,C-2
Seeding dates for the highest success probability ofperennial species along the Front Range are generally
in the spring from April through early May and in the fall after the first of September until the ground
freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for
appropriate seeding dates.
Table TS/PS-l. Minimum Drill Seeding Rates for Various Temporary Annual Grasses
Species"
(Common name)
Growth
Seasono
Pounds of
Pure Live Seed
(PLS)/acre"
Planting
Depth
(inches)
1. Oats Cool 35-50 1-2
2. Spring wheat Cool 25 -35 t-2
3. Spring barley Cool 25-35 1-2
4. Annual ryegrass Cool i0-15 r/z
5. Millet Warm 3-15 Vz - 3/¿
6. Sudangrass Warm 5-10 lz -3/¿
7. Sorghum Warm 5-10 Vz - 3/¿
8. Winter wheat Cool 20-35 r-2
9. Winter barley Cool 20-35 l-2
10. Winter rye Cool 20-35 r-2
11. Triticale Cool 2540 t-2
u Successful seeding of annual grass resulting in adequate plant growth will
usually produce enough dead-plant residue to provide protection from
wind and water erosion for an additional year. This assumes that the cover
is not disturbed or mowed closer than 8 inches.
Hydraulic seeding may be substituted for drilling only where slopes are
steeper than 3: 1 or where access limitations exist. When hydraulic
seeding is used, hydraulic mulching should be applied as a separate
operation, when practical, to prevent the seeds from being encapsulated in
the mulch.
b See Table TS/PS-3 for seeding dates. krigation, 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.
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EC-z Temporary and Permanent Seeding (TS/PS)
Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses
Commonn
Name
Botanical
Name
Growth
Seasonb
Growth
tr'orm
Seeds/
Pound
Pounds of
PLS/acre
Alakali Soil Seed Mix
Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25
Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5
Sodar streambank wheatgrass Agropyron riparium'Sodar'Cool Sod 170,000 2.5
Jose tall wheatgrass Ag,r opyron e I ong atum' J os e'Cool Bunch 79,000 '7.0
Arriba western wheatgrass A gr opyron smi thi i' Arr ib a'Cool Sod 110,000 5.5
Total t7.75
Fertile Loamy Soil Seed Mix
Ephriam crested wheatgrass
Agropyron cristatum
'Ephriam'Cool Sod r75,000 2.0
Dural hard fescue F p,stuc a ovina' duriusc ula'Cool Bunch 565,000 1.0
Lincoln smooth brome Bromus inermis leyss
'Líncoln'Cool Sod 130,000 3.0
Sodar streambank wheatgrass Agropyron riparium'Sodar'Cool Sod 170,000 2.5
Arriba westem wheatgrass Agropyron smithii'Arriba'Cool Sod 110,000 7.0
Total 15.5
High Water Table Soil Seed Mix
Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5
Redtop Agrostis alba Warm Open sod 5,000,000 0.25
Reed canarygrass Phalaris at'undinacea Cool Sod 68,000 0.5
Lincoln smooth brome Bromus inermis leyss
'Lincoln'Cool Sod 130,000 3.0
Pathfinder switchgrass Panicum virgatum
'Pathfinder'Warm Sod 389,000 1.0
Alkar tall wheatgrass
Agropyron elongatum
'Alkør'Cool Bunch 79,000 5.5
Total 10.75
Transition Turf Seed Mix"
Ruebens Canadian bluegrass P oa compressa'Ruebens'Cool Sod 2,500,000 0.5
Dural ha¡d fescue F e stt¿ca ov ina' duriuscula'Cool Bunch 565,000 1.0
Citation perennial ryegrass Lolium perenne'C itation'Cool Sod 247,000 3.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln'Cool Sod 130,000 3.0
Total 7.5
TS/PS-4 Jtne2012Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding (TS/PS) E'C-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 grama Bouteloua gracilis Warm Sod-forming
bunchgrass 825,000 0.5
Camper little bluestem S chizachyrium scopariunt
'Camper'Warm Bunch 240,000 1.0
Prairie sandreed C a I am ov i lfa lo n g ifo I i a Warm Open sod 274,000 1.0
Sand dropseed Sp orobolus c ryplandrus Cool Bunch 5,298,000 0.25
Vaughn sideoats grama B outeloua curtip endula
Taug,hn'Warm Sod 191,000 2.0
Arriba western wheatgrass Agropyron smithii'Arriba'Cool Sod 110,000 5.5
Total 10.25
Heavy Clay, Rocky Foothill Seed Mix
Ephriam crested wheatgrassd Agropyron cristatum
'Ephriam'Cool Sod 175,000 1.5
Oahe Intermediate wheatgrass Agropyron inÍermedium
'Oahe'Cool Sod r 15,000 5.5
Vaughn sideoats grama"B outeloun curtipendula
'Vaughn'Warm Sod 191,000 2.0
Lincoln smooth brome Bromus inermis leyss
'Lincoln'Cool Sod 130,000 3.0
Arriba westem wheatgrass Agropyron smithii'Arriba'Cool Sod 110,000 5.5
Total 17.5
All of the above seeding mixes and rates are based on drill seeding followed by crimped straw mulch. These rates should be
doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied
through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3: I . If
hydraulic seeding is used, hydraulic mulching should be done as a separate operation.
See Table TS/PS-3 for seeding dates.
If site is to be irrigated, the transition turf seed rates should be doubled.
Crested wheatgrass should not be used on slopes sfeeper than 6H to lV.
Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama.
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EC-2 Temporary and Permanent Seeding (TS/PS)
Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses
(Numbers in tal¡le reference
species in Table TS/PS-1)
Perennial Grasses
Seeding Dates Warm Cool Warm Cool
January l-March 15
March 16-Apri130 4 1,2,3
May 1-May 15 4
May 16-June 30 4,5,6,7
July l-July i5 5,6,7
July 16-August 31
September l-September 30 8,9,10,1 1
October l-December 31
Mulch
Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment
of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP
Fact Sheet for additional guidance.
Maintenance and Removal
Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed
and mulch these areas, as needed.
An area that has been permanently seeded should have a good stand of vegetation within one growing
season if irrigated and within three growing seasons without inigation in Colorado. Reseed ponions 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.
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TS/PS.6 Jlune2012
Mulching (MU)EC.4
Description
Mulching consists of evenly applying
straw, hay, shredded wood mulch, rock,
bark or compost to disturbed soils and
securing the mulch by crimping, tackifiers,
netting or other measures. Mulching helps
reduce erosion by protecting bare soil
from rainfall impact, increasing
infiltration, and reducing runoff.
Although often applied in conjunction
with temporary or permanent seeding, it
can also be used for temporary
stabilization of areas that cannot be
reseeded due to seasonal constraints.
Mulch can be applied either using
standard mechanical dry application
methods or using hydromulching equipment
that hydraulically applies a slurry of water,
wood fiber mulch, and often a tackifier.
Photograph MU-l. An area that was recently seeded, mulched,
and crimped.
Appropriate Uses
Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also
be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where
growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and
tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer
than 14 days) on portions of the site not otherwise permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed
in certain jurisdictions or may not be allowed near waterways.
Do not apply mulch during windy conditions.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track
walking. Track walking should only be used where other methods are impractical because track walking
with heavy equipment typically compacts the soil.
A variety of mulches can be used effectively at construction
sites. Consider the following:Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
SiteMaterial Management No
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Urban Storm Drainage Criteria Manual Volume 3
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¡
EC.4 Mulching (MIJ)
Clean, weed-free and seed-free cereal grain straw should be applied evenly atarate of2 tons per acre and
must be tacked or fastened by a method suitable for the condition of the site. Straw mulch must be
anchored (and not merely placed) on the surface. This can be accomplished mechanically by crimping or
with the aid of tackifiers or nets. Anchoring with a crimping implement is preferred, and is the
recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long
mulch fibers into the soil to a depth of 3 inches wittrout cutting them. An agricultural disk, while not an
ideal substitute, may work if the disk blades are dull or blunted and set vertically; however, the frame may
have to be weighted to afford proper soil penetration.
Grass hay may be used in place of straw; however, because hay is comprised of the entire plant including
seed, mulching with hay may seed the site with non-native grass species which might in tum out-compete
the native seed. Altematively, native species of grass hay may be purchased, but can be difficult to find
and are more expensive than straw. Purchasing and utilizing a certified weed-free straw is an easier and
less costly mulching method. When using grass hay, follow the same guidelines as for straw (provided
above).
On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory
for holding it in place. For steep slopes and special situations where greater control is needed, erosion
control blankets anchored with stakes should be used instead of mulch.
Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should
be applied at a tate of no less than 1 ,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of
tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for
effective hydroseeding. Hydromulch typically requires tp 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/IRM 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 ofprecipitation. An aggregafe 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.
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MU-2 Jtne2012
Rolled Erosion Control Products (RECP)EC.6
Description
Rolled Erosion Control Products
(RECPs) include a variety of
temporary or perrnanently 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 photograph RECP-I. Erosion control blanket protecting the slope from
(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 conûol
products such as turf reinforcement mats (TRMs) can be used. In particular, turf reinforcement mats are
designed for discharges that exert velocities and sheer stresses that exceed the typical limits of mature
natural vegetation.
Appropriate Uses
RECPs can be used to control erosion in conjunction with revegetation efforts, providing seedbed
protection from wind and water erosion. These products are often used on disturbed areas on steep
slopes, in areas with highly erosive soils, or as pafi 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
tempotary degradable rolled erosion control product to anchor loose fiber mulches.
Open weave textile: A temporary degradable rolled erosion control product composed of processed
natural or polymer yarns woven into a matrix, used to provide erosion control and facilitate
vegetation establishment.
¡Erosion control blanket (ECB): A temporary
degradable rolled erosion control product composed of
processed natural or polymer fibers which are
mechanically, structurally or chemically bound together
to form a continuous matrix to provide erosion control
and facilitate vegetation establishment. ECBs can be
further differentiated into rapidly degrading single-net
and double-net types or slowly degading types.
Rolled Erosion Control Products
Í'unctions
Erosion Control Yes
Sediment Control No
SiteMaterial Management No
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Urban Storm Drainage Criteria Manual Volume 3
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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, and/or other elements, processed into a permanent, three-
dimensional matrix of sufficient thickness. TRMs, which may be supplemented with degradable
components, are designed to impart immediate erosion protection, enhance vegetation establishment
and provide long-term functionality by permanently reinforcing vegetation during and after
maturation. Note: TRMs are typically used in hydraulic applications, such as high flow ditches and
channels, steep slopes, stream banks, and shorelines, where erosive forces may exceed the limits of
natural, unreinforced vegetation or in areas where limited vegetation establishment is anticipated.
Tables RECP-I and RECP-2 provide guidelines for selecting rolled erosion control products appropriate
to site conditions and desired longevity. Table RECP-I is for conditions where natural vegetation alone
will provide pemanent erosion control, whereas Table RECP-2 is for conditions where vegetation alone
will not be adequately stable 1o provide long-term erosion protection due to flow or other conditions.
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RECP-2 November 2010
Rolled Erosion Control Products (RECP)EC-6
Table RECP-I. ECTC Standard Specification for Temporary Rolled Erosion Control Products
(Adapted from Erosion Control Technology Council 2005)
* C Factor and shear stress for mulch control nettings must be obtained with netting used in conjunction
with pre-applied mulch material. (See Section 5.3 of Chapter 7 Construction BMPs for more information
on the C Factor.)
t Minimum Average Roll Values, Machine direction using ECTC Mod. ASTM D 5035.
t C Factor calculated as ratio of soil loss from RECP protected slope (tested at specified or greatet
gradient, H:V) to ratio of soil loss from unprotected (control) plot in large-scale testing.
3 Required minimum shear stress RECP (unvegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in) soil loss) during a 3O-minute flow event in large-scale testing.
a The permissible shear stress levels established for each performance category are based on historical
experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05.
5 Acceptable large-scale test methods may include ASTM D 6459, or other independent testing deemed
acceptable by the engineer.
6 Per the engineer's discretion. Recommended acceptable large-scale testing protocol may include ASTM
D 6460, or other independent testing deemed acceptable by the engineer.
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Urban Storm Drainage Criteria Manual Volume 3
Product Description Slope
Applications*
Channel
Applications*
Minimum
Tensile
Strengthl
Expected
Longevity
Maximum
Gradient C Factor2'5 Max. Shear
Stress3'a'ó
Mulch Control Nets 5:1 (H:V)10.10 @
5:1
0.25tbslft
(r2Pa)
5lbs/ft
(0.073 tN/m)
Up to 12
months
Netless Rolled
Erosion Control
Blankets
4:1 (H:V)<0.10 @
4:l
0.5lbsÆt2
(24Pa)
5lbs/ft
(0.073 tN/m)
Single-net Erosion
Control Blankets &
Open Weave Textiles
3:1(H:V)r0.15 @
3:1
1.5lbsÆt2
(72Pa)
50lbsÆt
(0.73 kN/m)
Double-net Erosion
Control Blankets 2:1 (H:V)30.20 @
2:l
1.75lbslftz
(84 Pa)
75 lbs/ft
(1.09 kN/m)
Mulch Control Nets 5:1(H:V)s0.10 @
5:1
0.25lbslftz
(r2Pa)
25lbslft
(0.36 kN/m)24 months
Erosion Control
Blankets & Open
Weave Textiles
(slowly degrading)
1.5:1(H:V)<0.25 @
1.5:1
2.00lbslftz
(96 Pa)
100 lbs/ft
(t.45 kN/m)24 months
Erosion Control
Blankets & Open
Weave Textiles
1:1(H:V)=0.25 @
l:1
2.25lbs/ftz
(108 Pa)
125lbslft
(1.82 kN/m)36 months
November 2010 RECP-3
EC-6 Rolled Erosion Control Products (RECP)
Table RECP-2. ECTC Standard Specification for Permanentl Rolled Erosion Control Products
(Adapted from: Erosion Control Technology Council 2005)
I For TRMs containing degradable components, all property values must be obtained on the non-
degradable portion of the matting alone.
t Minimum Average Roll Values, machine direction only for tensile strength determination using ASTM
D 6818 (Supersedes Mod. ASTM D 5035 for RECPs)
t Field conditions with high loading andlor high survivability requirements may warrant the use of a TRM
with a tensile strength of 44 kN/m (3,000 lb/ft) or greater.
aRequired minimum shear stress TRM (fully vegetated) can sustain without physical damage or excess
erosion (> 12.7 mm (0.5 in.) soil loss) during a 3O-minute flow event in large scale testing.
s Acceptable large-scale testing protocols may include ASTM D 6460, or other independent testing
deemed acceptable by the engineer.
Design and Installation
RECPs should be installed according to manufacturer's specifications and guidelines. Regardless of the
type of product used, it is important to ensure no gaps or voids exist under the material and that all
corners of the material are secured using stakes and trenching. Continuous contact between the product
and the soil is necessary to avoid failure. Never use metal stakes to secure temporary erosion control
products. Often wooden stakes are used to anchor RECPs; however, wood stakes may present installation
and maintenance challenges and generally take a long time to biodegrade. Some local jurisdictions have
had favorable experiences using biodegradable stakes.
This BMP Fact Sheet provides design details for several commonly used ECB applications, including:
ECB-I Pipe Outlet to Drainageway
ECB-2 Small Ditch or Drainageway
ECB-3 Outside of Drainageway
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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 807o per
ASTM D 4355 (500 hours
exposure).
Maximum
Gradient
Maximum
Shear Stressa's
Minimum
Tensile
Strength2'3
0.5:1(H:V)6.0lbsÆt2 (288 Pa)l25lbslft (L82
tN/m)
0.5:1 (H:V)8.0 lbs/ft2 (384 Pa)150lbsÆt (2.19
tN/m)
0.5:1(H:V)10.0lbsÆr2 (480 Pa)175 lbs/ft (2.55
kN/m)
RECP-4 November 2010
Rolled Erosion Control Products (RECP)EC-6
Staking patterns are also provided in the design details according to these factors:
ECB type
. Slope or channel type
For other types of RECPs including TRMs, these design details are intended to serve as general
guidelines for design and installation; however, engineers should adhere to manufacturer's installation
recommendations.
Maintenance and Removal
Inspection of erosion control blankets and other RECPs includes:
. Check for general signs of erosion, including voids beneath the mat. If voids are apparent, fill the
void with suitable soil and replace the erosion control blanket, following the appropriate staking
pattern.
. Check for damaged or loose stakes and secure loose portions of the blanket.
Erosion control blankets and other RECPs that are biodegradable typically do not need to be removed
after construction. If they must be removed, then an alternate soil stabilization method should be installed
promptly following removal.
Turf reinforcement mats, although generally resistant to biodegradation, ate 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.
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November 2010 RECP-5
EC.6 Rolled Erosion Control Products (RECP)
ECE
UNDISTURBED PERIMEÏãR
ANCHOR
TRENCH, TYP
JÔINT ANCHOR
TÊÉNCH, TYP.
TOP OF
CHANNEL BANKsotL
TYPE OF EC
DISTURBED AREAS OF STREAMS AND ORAINAGE CHANNELS TO
O ABOVE CHANNEL INVERT, ECB SHALL GTNERALLY BE ORIENÏED
PARALLEL TO FLOW DIRECTION (I.8. LONG DIMENSIONS OF EI.ANKET
PARALLEL IO FLOWLINES) STAKINC FATTERN SHALL MATCH EC8
AND/ÖR CHANNEL TYPE.
FCB_1. PIPE OUT TO TJRAINAGFWAY
ANCHOR DETAILS
JOINT ANCHOR
TRENCH, TYF.
TYPË OF ECB,
INDICATED IN PLAN VIEW
ECB SHALL
EXTEND TO THE
TOP OF THE
CHANNEL
6
TOFSOI
D
PERIMETER ANCHTR
TRENCH, TYP.
COMPACÏED
SUBGRADE
STAKING PATTËRN PER MÀNUFACTURER SPÊC. OR PAÏÏERN
BÂSED ON ECB AND/OR CHANNEL TYPE (S[E SIAKING
PATTER¡I DETAIL)
ECB_z. SMALL DITC H OR DRAINAGEWAY
GEOTËXÏILË
FABRIC OR MAÍ, TYP
PERIMETER ANçHOR TRENCH
c0
3,, MIN, TYP
BACKFILL, TYP
SINCLE IDGE
STAKE, TYP.
TWO EOGES
OF ÏWO
ADJAÕENÏ
ROLLS
JOINT ANCHOR TRENCH
INTERMEOIATE ANCHOR TRENCI-{
LOOP FRÕM
MIOOLE OF
ROLL
"*ff
OVERIIPPING JOINT
n l- i" MrN.
WOOD STAKE DTTAL
12"
MIN,
RECP-6 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Rotled Erosion Control Products (RECP)EC-6
DIVERSION DITCH
TYPICALLY ÀT lOP OF
SLÔPÊ
FCB_3. OUTSIDE ÕF
STÀGGER OVERLAPS
OVERLAPPING JOINT
STAKING PÅTTERN PER
MANUFACTURER SPEC. OR PATTERN
FASED ON ECB ANo/OR SLOPE
ÎYPE (SEE STAKING PATTERN DETAIL)
ANCHOR
DRAINAGEWAY
TRËNCH
ru
ROLL
STRAW
6'
tlw
il#þ
I
-r,
1:
*l"l*
oo*t
ô
'*hwÌ*ø*;r,T,,-kw
STRAW-COCONUT
,6 Io *!r*W
+o
c
2:1 AND STËEPER
SLOPES
+looo ltw
COCONUT OR EXCELSIOR
ço *Y+¡n
-Y¿w
o
o
STAKING PATTIRNS BY ECB TYPE
?t
-+l *kw 2'
5'
4:1-3: 1
SLOPES
Y2w
o
o
+
o
o66
tt
2
J:f -2:l
SLOPES
4 oÕ9
ôôó
20"F.
LOW FLOW CHANNEL
ı ô
2û"
Þoo
HICH FLOW CHANNEL
4
qTAKll..llì PA PNtq RY qt ôptr ôp l'
November 2010
^NtNttrt
TYptr
RECP-7Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
EC.6 Rolled Erosion Control Products (RE CP)
EROSION CONTRÖL BLANKET INSTALLAÏION NOTES
1, SEE PLAN VIET'ìI FOR;
_LOCATION OF ECB.
-rrPE oF ECS (ÊÎRAw, STRAW-CoCONUT, CoC0NUÏ, 0R ExCELSlofi).
_AREA, A, IN SOUARE YARûS ÔF EACH ÏYPE OF ECB,
2, 1OA7¿ NATURAL AND BIODECÊADAELE MATERIALS ARE PREFERRET FOR RECPS, ALÏHOUCH
SOME JURISDICTIONS MAY ALLOW OÎHER MATERIALS IN SOME APPLICATIONS.
3, lN AREAS WHERE eCBs ARE SHOWN ON THE PLANS, IHE PÊRMITÏÉE SI-IALL P|ACE
TOPSOIL AND PERFORM FINAL GRADINç, SURFACE PREPÀRATION, AND SEEDING ANO MULCHING
SUBGRADE SHALL BE SMOOTH AND MOIST PRIOR TO ECB INSTALLAÏIoÎ.¡ AND TI-IE ECB SHALL
8E IN FULL CONIACT WITH SUBGRADE. NO ôAPS OÊ VÔIOS SHALL EXIST UNDEÊ THE
BLANKET.
4. PERIMETER ANCHOR TRENCH SHALL BÊ USED ALONG THE OUTSIDE FERIMETER OF ALL
BLANKET AREAS.
5. JOINI ANCH0R TRENCH SHALL EE USEû 10 JOIN ROLLS oF ECBs ÏOGETHER
(LONGIÏUDINALLY AND TRANSVERSELY) FOR ALL ECBS EXCEPT STR,{W WHICH MAY USE
AN OVËRLAPPING JOINT.
6, INTERMEÞIATE ANCHOR TRENCH SHALL BE USED AT SPACING OF ONE-HALF ROLL LENTTH
FOR CôCONUT AND EXCELSIOR ECBs.
7. OVERLÂPPING JOINT DETAL SHALL BE USED TO JOIN ROLLS OF ECBs TÔCETHER FOR ECÊS
ON SLOPES.
8. MATERIAL SPECIFICATIONS OF ECEs SI-IALL CONFORM TO ÏABLE ECÊ-1,
9. ANY AREAS OF SEEDING AND MULCHING DISTUREED IN THE PROCESS OF INSIALLINC ECBS
SHALT BE RESEEDED ANO MULCHEÛ.
10. DETAILS ON DESIGN PLANS F-OR MAJOR DRAINAGEWAY STABIUZAÏION WILL GOVEfiN IF
ÐIFFERËNT FfiOM THOSE SHOVYN HERE.
MAY
IASLE TCÊ_I. ECB MATERIAL SPECIF"rcATIONS
TYPE côc0NU1
CONTENT
SÏRAW
CONTËNT
EXCELSIÔR
CONÏËN1
RECÔMMENDEO
NETflNC}+
STRAW*10ß7.DOUBLE/
NATURAL
STRAW_
COCONUÏ 302 MrN 70% MAX DOUBLE/
NATURAL
CôCÔNUT 10û7,DOUBLE/
NATURAL
EXCELSIOR r 002 DoUBLE/
NAÏURAL
RECP-8 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Rolled Erosion Control Products (RECP)EC-6
ËROSION CONTROL ELANKET MAINTENANCE NOTES
1, INSPECT BMPË EACH t IORKDAY, AND MAINTAIN TH€M lN EFFECTIVE OPERATING CONIIITION
MAINTÊNANCE OF BMPs SHOULD BE PRoACTIVE, NOT REACTIVE. INSPECï BMFs AS SOON AS
POSSIELE (AND ALWAYS WTTH|N 24 HoURS) FOLLOWNG A STÔRM THÀT CAUSES SURFACE
ERÕSION, AND PERFÔRM NECESSARY MAINTENANCE.
2. FREQUENI OESERVATIONS AND MAINIENANCE ARE NECESSARY IO MAINTAIN ÊMPs lN
EFFECTIVE OPERATING CONDITION, INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
ÐOCUMENTED THOROUGHLY.
3. WHERÊ BMPs HAVE FÀILEÞ, REPAIR OR REPLACEMENT SHOULO EE NfiAIED UP0N
TISCCVERY OF ÏHË TALURE.
4. ECEs SHALL BE LEFT IN PIACE TO EVENTUALLY BIODEGRADE, UNLESS REQUESTED TO BE
REMOVED BY THE LOCAL JURISDICTION,
5. ANY EC8 PULLED OUÎ, TORN, OR OTHERWISE DAMAGED SHALL BE REPAIRED OR
REINSTALLED. ANY SUEGRADË ARËÀS BELOW ÏHE GËÛTËXTILË THAÏ HAVE ERODEO TO CREATED
A VOID UNI]ER THE BLANKET, OR THAT REMAIN DËVOID OF GRASS SHALL BE REPAIRED.
REÊEEOED AND MULCHED AND TTIE ECB REINSTALLED.
NOIE: MANY JUÊ|S0|CT|ONS HAVE BMP DEIAILS INAÍ VARY FROM UDFCD STÂNDARD DEïAILS
CONSULT WITII LOCAL JURISDICTIONS AS TO WI.IICH T}ETAIL SHOULD 8E USED IJ'/HEN
DIFFERENCES ARÊ NOTED.
(orrm-s eolrreo rnou DotJsLAs couNry, coLonÂoo Àro fowN oF pÂnkeñ coLoRADo, t{or AvAILÅBLE tN AUrocAo)
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 RECP-9
Temporary Outlet Protection (TOP)E,C-8
Description
Outlet protection helps to reduce erosion
immediately downstream of a pipe,
culvert, slope drain, rundown or other
conveyance with concentrated, high-
velocity flows. Typical outlet protection
consists ofriprap or rock aprons at the
conveyance outlet.
Appropriate fJses
Outlet protection should be used when a
conveyance discharges onto a disturbed
area where there is potential for accelerated Photograph TOP-1. Riprap outlet protection.
erosion due to concentrated flow. Outlet
protection should be provided where the velocity at the culvert outlet exceeds the maximum permissible
velocity of the material in the receiving channel.
Note: This Fact Sheet and detail are for temporary outlet protection, outlets that are intended to be used
for less fhan 2 years. For permanent, long-term outlet protection, see fhe Major Drainage chapter of
Volume 1.
DesÍgn and Installation
Design outlet protection to handle runoff from the largest drainage area that may be contributing runoff
during construction (the drainage area may change as a result of grading). Key in rock, around the entire
perimerer of the apron, to a minimum depth of 6 inches for stability. Extend riprap to the height of the
culvert or the normal flow depth of the downstÍeam channel, whichever is less. Additional erosion
control measures such as vegetative lining, turf reinforcement mat and/or other channel lining methods
may be required downstream of the outlet protection if the channel is susceptible to erosion. See Design
Detail OP-l for additional irformation.
Maintenance and Removal
Inspect apron for damage and displaced rocks. If rocks are missing or significantly displaced, repair or
replace as necessary. If rocks are continuously missing or displaced, consider increasing the size of the
riprap or deeper keying of the perimeter.
Remove sediment accumulated at the outlet before the outlet protection becomes buried and ineffective.
When sediment accumulation is noted, check that upgradient BMPs, including inlet protection, are in
effective operating condition.
Outlet protection may be removed once the pipe is no longer
draining an upstream area, or once the downstream area has
been sufficiently stabilized. Ifthe drainage pipe is
permanent, outlet protection can be left in place; however,
pemanent outlet protection should be designed and
constructed in accordance with the requirements of the
Major Drainage chapter of Volume 2.
Outlet Protection
Functions
Erosion Control Yes
Sediment Control Moderate
SiteMaterial Management No
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 TOP-1
EC-8 Temp orary Outlet Protection (TOP)
EXTEND RIFRAF TO HEIGHT OF
CULVTRT OR NORMAL CHANNEL
DEPTH, WHICHEVER IS LESS
+(Do)
TEMPORARY OUTLET PROTECTION PI-AN
D=2xO50
NON_WOVËN
GEOTEXT¡LE KEY lN ï0 2 x 050
AROUND PERIMETËR
STCTION A
3(Do)
Lo
E%
rABLE OP-1, TEMPORÀRY OUTLET FROÏECÏION
SIZINC TABLE
PIPE
DIAMEÏER
Do
(tNcHES)
OISCHARG€,
0 (cFs)
APRON
LENGTH Lo
(FT)
RIPRAP DsO
OIAMETER
MIN
0NcHES)
I 2.5
5
5
10
4
6
12 J
10
t0
I3
4
6
]B
tg
2ü
30
+0
t0
lö
23
26
6I
12
16
24
30
40
50
60
't 6
26
26
50
I
s
12
l6
TOP-2 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protection (TOP)EC.8
TEMPORARY OUTLET PROÏECÏIÕN INSTALLATION NOTES
1. SEE PL.AN VIEIT FOR
_LOCATION OF OUTLÊÏ PROTECTION,
*DIMENSIONS OF OUÏLËÏ PROTECTION,
2. ÐffAL 15 INTENDED FOR PIPES WITH SLOPE S IOia, ADDITIONAL EVALUATION OF RIPRAP
SIZING AND OUTLET PROTECTION DIMENSÍONS REQUIRED FOR SÏEEPER SLOPES.
3. T€MPÕRARY OUTLET PROTECTION INFORMAÏIÔN IS FOR OUrIETS INTENDËD TÔ BE UTIUZET
LESS THAN 2 YEARS,
TEMPORARY OUTLET PROTECTION INSFECTION ANO MÂINTENANCE NOTES
1.
'NSPECT
BMPs EACH WORKDAY, AND MAINTAIN THEM lN EFFECTIVE OPERAïING CONDIT|ôN,
MAINIENANCE OF BMPs SHOULD BE PROACIIVÉ, NOT REACTIVE. INSPECï BMPs AS SOON AS
POSSTBLE (AND ALWAYS WTTHIN 24 HOURS) FOLLOWTNG A STORM THAT CAUSES SURFACÊ
EROSION, AND PERFORM NÉCESSARY MAINTENÀNCE,
2, TREOUENI OBSERVATIONS AND MAINTENANCE ARE NECÊSSARY Io MAINTAIN BMPs lN
EFFECTIVE OPERATING CONDIÍION. INSPËCÏIONS AND CORRTCTIVE MEASURES SHÔULD BE
DOCUMENTED THOROUGHLY.
J. ytlHERE BMPg HAVE FAILED, REPAIR OR REPLACEMENT SHOULÐ BE lNlTlAIÊD UPON
ÙISCOVERY OF ÌHE FAILURE,
|'{OTE; MANY JURISDICIIONS HAVË BMP DEIAILS ïHAT VARY FROM UDFCD SÍANDARD DETAILS,
CONSULT WITH LOCAL JUÊISÞICTIONS AS TO WHICH DETAIL SHOULÞ 8E USED WHEN
DIFFERENCËS AÊE NOTED.
(DEÌAILS AÞÄPÍEO FFOM AUROFA, COLORAOO ÂN0 PÊÊVTOUS VÊRSTON OF VOLUME 3. NOt AVATLABLE rN ÂUÍOCAD)
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 TOP-3
Earth Dikes and Drainage Swales (EDIDS) EC-10
Description
Eafth dikes and drainage swales are
temporary storm conveyance channels
constructed either to divert runoff around
slopes or to convey runoff to additional
sediment control BMPs prior to discharge
of runoff from a site. Drainage swales
may be lined or unlined, but if an unlined
swale is used, it must be well compacted
and capable ofresisting erosive velocities.
Appropriate Uses
Earth dikes and drainage swales are
typically used to conffol the flow path of
runoff at a construction site by diverting
runoff around areas prone to erosion, such
as steep slopes. Earth dikes and drainage
swales may also be constructed as
tempomry conveyance features. This will
direct runoff to additional sediment control
treatment BMPs, such as sediment traps or
basins.
Photograph ED/DS-l. Example of an earth dike used to divert
flows at a construction site. Photo courtesy of CDOT.
Design and fnstallation
V/hen earth dikes are used to divert water for slope protection, the earth dike typically consists of a
horizontal ridge of soil placed perpendicular to the slope and angled slightly to provide drainage along the
contour. The dike is used in conjunction with a swale or a small channel upslope of the berm to convey
the diverted water. Temporary diversion dikes can be constructed by excavation of a V-shaped trench or
ditch and placement of the fill on the downslope side of the cut. There are two types of placement for
temporary slope diversion dikes:
A dike located at the top of a slope to divert upland runoff away from the disturbed area and convey it
in a temporary or peÍnanent channel.
A diversion dike located at the base or mid-slope of a disturbed area to intercept runoff and reduce the
effective slope length.
Depending on the project, either an earth dike or drainage swale may be more appropriate. If there is a
need for cut on the project, then an excavated drainage
swale may be better suited. When the project is primarily
fill, then a conveyance constructed using a berm may be the
better option.
All dikes or swales receiving runoff from a disturbed
area should direct stormwater to a sediment control
BMP such as a sediment trap or basin.
Earth Dikes and Drainage Swales
Functions
Erosion Control Yes
Sediment Control Moderate
SiteÀdaterial Manasement No
Urban Drainage and Flood Control District
Urban Stom Drainage Criteria Manual Volume 3
November 2010 ED/DS-1
EC-10 Earth Dikes and Drainag e Swales (ED/DS)
Untined dikes or swales shoutd only be used for intercepting sheet flow runoff and are not intended
for diversion of concentrated flows.
Details with notes are provided for several design variations, including:
ED-1. Unlined Earth Dike formed by Berm
DS-1. Unlined Excavated Swale
DS-2. Unlined Swale Formed by Cut and Fill
DS-3. EcB-lined Swale
DS-4. Synthetic-lined Swale
DS-5. Riprap-lined Swale
The details also include guidance on permissible velocities for cohesive channels if unlined approaches
will be used.
Maintenance and Removal
Inspect earth dikes for stability, compaction, and signs of erosion and repair. Inspect side slopes for
erosion and damage to erosion control fabric. Stabilize slopes and repair fabric as necessary. Ifthere is
reoccurring extensive damage, consider installing rock check dams or lining the channel with riprap.
ff drainage swales are not permanent, remove dikes and fill channels when the upstream area is stabilized
Stabilize the fill or disturbed area immediately following removal by revegetation or other pemanent
stabilization method approved by the local jurisdiction.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
ED/DS-2 November 2010
Earth Dikes and Drainage Swales (E D/DS) EC-10
TRANSVERSE{:rloÚft sw¡t-e\- ExrsflruG cRnDEì
ED_ 1 . COMPACTTD UNLINED EARTH DIKE FORMED BY BERM
ÎRANSVERSE FLOW
ro-sfrÃfr
15,, MIN
nq- 1
EXISTING CRAD€
rirì[/pacTtrn ilNl INtrN trYNÀ\/ATtrD qWAI tr
--::LÔv¡\ ,r,=r,*o o*o,
15" MrN
DS_2. COMP D UNLINED SWALT FORMT BY CUT AND
FILL
w (5' MtN,)
GEOTEXTILE OR MAT
(sËE Ecs)
INTERMEDIATE ANCHOR TRENCH AT
ONE_HALF ñOLL LENGÏII
(sEE ECB)
0 (ro" MrN.)
STAKES (SEE ECB)
-l
ANCHOR TRENCH AÏ
PERIMETER OF
ÊIANKET ANO AT
ÔVERL.APPING JOINTS
WTH ANY AOJACENT
ROLLS ÔF BLANKET
(sEE EC8)
TRANSVERSE ANCHOR TRËNCHËS AT
PERIMETER OF BLANKET AND AÏ
OVERLAPPINC JOINTS WITH ANY ADJACINÏ
ROLLS OF BLANKET (SEE ECB)
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 ED/DS-3
EC-10 Earth Dikes and Drainag e Swales (ED/DS)
(1o" MrN,)
w MIN
NO
SÏAKING
ANCHOR TRENCH AT PËRIMEÏER
OF BLANKET AND AT
OVERLAPPING JÔINTS WITH ANY
ADJACTNT ROLLS OF BLANKET,
SIMII-AR TO ECE, EUT NO
STAKING
TRANSVERSE ANCHOñ TRENCHES AT PERIMTTER OF
BLANKTT ANO AT OVERLAPPING JOINTS WITH ANY
ADJACENT RÔLLS OF BLANKET, SIMILAR TÔ ECB, EUT
NO STAKING
LINE WTH AASHTO
#3 ROCK (CDOT SECT
7A3, #3) OR RTPRAP
CALLED FOR IN THE
PLANS
JO MIL MIN.
THICKNESS
INTERMEDIATE ANCHOR
TRENCH AT ONE-HALF ROLL
LENGTH SIMILAR TO ECÊ,
SUT NO STAKING
Nq-4 qYNTH e I rNFn qwAt r
THICKNESS=2 X DSO w 5' MrN,
DS_s. RIPRAP LINED SWALE
EAR'H OIKE AND DRA¡NACE SWALE INSTALLATION NOTES
SITE PLAN FOR:
LOCATION OF DIVERSION SWALE
TYPE OF SWALE {UNLINED, COMPACTED AND/OR LINEO),
LENGTH OF EACH SWALE.
DEPTH. D, AND WIûTH. YI DIMËNSIONS.
FOR ECB/TRM LINED DITCH, SEE ECB OETAIL.
ron RlpÉnp LTNED DtrcH, stzÉ oF RIPRAP, 050.
SEE
2. SEE DËAINAGE PLANS FoR DETAILS OF PÊRMANENT CONVEYANCE FACILITIES ANÐ/OR
DIVERSION SWALES EXCÊEDING z-YEAR FLOW RATE OR 10 CFS,
3, EARTH DIKES AND SWALES INÐICATED ON SWMP PLAN SHALL BE INSÍALLED PRIOR TO
LAND.DISTURBING ACTIVITIES IN PROXIMITY.
4. EMBANKMENT IS TO BE CÖMPACTED IO 90% OF MAXIMUM DENSITY ANO WITHIN 2% QF
OPTIMUM MOISTURE CONTENT ACCOROING TO ASÏM D698.
5. SWALES ARE TO DRAIN TO A SEDìMENT CONTROL BlvlF'
6. FOR LTNED olTCt-lES, TNSTALLÂI|ON OF ECB/TRM SHALL CONFORM rO THE REoUTREMENÏS
OT THE ECB ÐETÀII.
7. WI{EN CONSIRUCTION TRAFFIC MUST CROSS A ÐIVERSION SWALE, INSIALL A TEMPORARY
CULVÊRT IVITH A MINIMUM I]IAMETER OF 'I2 INCHES.
(ro" MrN.)
ED/DS-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Earth Dikes and Drainag e Swales (ED/DS) EC-1"0
ËARTH DIKE AND DRAINAGE SWALE MÄNTENANCË NOÏES
1, INSPECÎ BMPs EACH WORKDAY, AND MAINTAIN THEM lN EFFÊCTIVE OPERATING CONOITION.
MATNTENANCE OF EMPs SHOULD BE PROACIIVE, NOT REACTIVE. INSPECI EMPs AS SOON AS
posstBlE (AND ALWAYS WtTHtN 24 HoURS) FOLLOìJV|NG A STORM IHÀÎ CAUSES SURFACE
EROSION, AND PERFORM NECESSARY MAINÏENANCE.
2. FREOUENI OBÊERVATIONS AND MAINTENANCE ARE NECESSARY IO MAINIAIN ÊMPs lN
EFFECTIVE OPERATING CONDITION, INSPECTIONS AND CORRECTIVE MEASUñES SHOULD BE
DOCUMENTED THOROUGHLY.
3. WHERE BMFs HAVE FAILEÞ, REPAIR OR REPLACEMENI SHOUL0 BE lNlÏlAÏED UFON
DISCOVERY OF THE FAIIURE.
4. SWALES SHALL REilrAlN lN PLACE UNIIL THE END OF CONSTRUCTION; lF APPROVED BY
LOCAL JURISDICTION, SWALES MAY 8E LET"T IN PLACE.
5, WHEN A SIVALE IS REMOVEÐ, THE DISTURBED AREA SHALT BE COVERED WITH ÏOPSOIL,
SEEDEO ANO MULCHED OR OTHÊRWISE STABILIZÉD IN A MANNER APPROVED BY LOCAL
JURISDICTIÛN.
(DET¡¡L ADAPTEo FROM û0UCICS CouNÎr, COLORAoO ANo ÎHÊ Cril OF CoLORADÕ SPR[{C-S, COTORAOo, NoT ÀvÂil-A8LE lN
ÀufocAD)
NCIå MANY JUR|SD|CnONS HAVE BMF DEIATLS THAT VARY FRoM UDFCD STANDARD DEÏArLS.
CONSULT WITH LOCAL JURISDICÌIONS AS TO WHICH DETAIL SHOULD BE USED WHEN
ÐIFTËRENCES ARE NÔTED,
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 ED/DS-5
\Mind Erosion/Dust Control (DC)F"C-I4
Description
'Wind erosion and dust control BMPs
help to keep soil particles from entering
the air as a result of land disturbing
construction activities. These BMPs
include a variety of practices generally
focused on either graded disturbed areas
or construction roadways. For graded
areas, practices such as seeding and
mulching, use of soil binders, site
watering, or other practices that provide
prompt surface cover should be used.
For construction roadways, road
wâtering and stabilized surfaces should
be considered.Photograph DC-l. Water truck used for dust suppression. Photo
courtesy of Douglas County.
Appropriate Uses
Dust control measures should be used on any site where dust poses a problem to air quality. Dust control
is important to control for the health of construction workers and surrounding waterbodies.
Design and Installation
The following construction BMPs can be used for dust control:
. An inigation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil
particles from becoming airbome.
' Seeding and mulching can be used to stabilize disturbed surfaces and reduce dust emissions.
. Protecting existing vegetation can help to slow wind velocities across the ground surface, thereby
limiting the likelihood of soil particles to become airborne.
Spray-on soil binders form a bond between soil particles keeping them grounded. Chemical
treatments may require additional permitting requirements. Potential impacts to surrounding
waterways and habitat must be considered prior to use.
Placing rock on construction roadways and entrances will help keep dust to a minimum across the
construction site.
¡
Wind fences can be installed on site to reduce wind
speeds. Install fences perpendicular to the prevailing
wind direction for maximum effectiveness.
Maintenance and Removal
When using an irrigation/sprinkler control system to aid in
dust control, be careful not to overwater. Overwatering will
cause construction vehicles to track mud off-site.
\ilind Erosion Controli
Dust Control
Functions
Erosion Control Yes
Sediment Control No
SiteMaterial Management Moderate
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 DC-1
Silt Fence (SF)SC.1
Description
A silt fence is a woven geotextile fâbric
attached to wooden posts and trenched
into the ground. It is designed as a
sediment barrier to intercept sheet flow
runoff from disturbed areas.
Appropriate Uses
A silt fence can be used where runoff is
conveyed from a disturbed area as sheet
flow. Silt fence is not designed to
receive concentrated flow or to be used
as a filter fabric. Typical uses include:
Down slope of a disturbed area to
accept sheet flow.Photograph SF-l. Silt fence creates a sediment barrier, forcing
sheet flow runoff to evaporate or infiltrate.
Along the perimeter of a receiving
water such as a stream, pond or
wetland.
. At the perimeter of a construction site.
Design and Installation
Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum
recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is
approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no
steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only
applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter
control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook"
installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive conditions parallel to the silt fence.
See Detail SF-l for proper silt fence installation, which involves proper trenching, staking, securing the
fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled
out by hand and there should be no gaps between the ground and the fabric.
Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and
other specifications in the design details. Improper installation
of silt fence is a common reason for silt fence failure; however,
when properly installed and used for the appropriate purposes, it
can be highly effective.
Silt Fence
Functions
Erosion Control No
Sediment Control Yes
SiteMaterial Management No
Urban Drainage and Flood Control District
Urban Stom Drainage Criteria Manual Volume 3
November 2010 SF.1
SC-1 Silt Fence (SF)
Maintenance and Removal
Inspection of silt fence includes observing the
material for tears or holes and checking for slumping
fence and undercut areas b¡rpassing flows. Repair of
silt fence typically involves replacing the damaged
section with a new section. Sediment accumulated
behind silt fence should be removed, as needed to
maintain BMP effectiveness, typically before it
reaches a depth of 6 inches.
Silt fence may be removed when the upstream area
has reached final stabilization.
Photograph SF-2. When silt fence is not installed along
the contour, a "J-hook" installation may be appropriate
to ensure that the BMP does not create concentrated
flow parallel to the silt fence. Photo courtesy of Tom
Gore.
SF-2 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Silt Fence S SC.1
6" MrN
AT LEAST IO"
OF SILT FENCE,,TAIL" SHALL BË
BURIED
JOIN
ROTAÎE
SECONÛ
POSTS SHALL BE JOINED A5
SHOWN, THEN ROTATED 180 DEG.
IN OIRECNON SHÔWN AND DRIVEN
INTO THE GROUND
r8'
MIN
4" MrN
SILT FENCE
tIâ"xtk"
(RECOMMENDED) WOODEN
FENCE POST WTH 10. MAX
SPACING
36"-+8"
TYP,
POSTS SHALL OVERLAF
AÏ JOINÏS SO ÏHAÏ NO GAFS
ÊXISI IN SILT
ÍHICKNESS OF CEOTEXTILE HAS
ÊEÊN EXAGCERATED, TYP
SILT FENCE
GÊOÏEXTILE
COMPACÏED
EACKNLL
FLOW
-
--?-
ex,srr"c -/CROUND
SECTION A
SF_1. SILT FENCT
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SF.3
SC.1 Silt Fence (SF)
SILT FENCE INSTALLATION NOTES
1, SILT FENCE MUST BE PI.ACËD AWAY FROM lHE TOE OF THE SLOPE TO ALLOì/V FOR WAÏER
PONDING. SILT FENCE AT THÊ TOE OF A SLOPE SHOULD BE INSTALLED IN A FLAT LOCATION
Ar LEAST SEVÊRAL FEET (2-5 Fr) FRÔM IHE TOE OF rHE SLOPE TO ALLOW ROOM FOR
PÔNDING AND DEPOSITION.
2. A UNIFORM 6'' X 4'' ANCHOR TRENCH SHALL 8E EXCAVÂTED USINC TRENCHER OR SIIT
FENCE INSTALLATION ÐEVICE. NO ROAD GRADERS, BACKHOES, OR SIMILÀR EOUIPMENT SHALL
gE USED.
3. COMPACT ÀNCHOR TRENCH BY I-IAND WITH A "JUMPIN€ JÀCK'' OR BY WHEEL ROLLING.
COMPACTION SHALL 8E SUCH THAT SILT FENCE RESISÍS BEING PULLEÛ OUT OF ANCHOR
TRENCH BY HAND,
4. SILT FENCE SHALT BE PULLEO TIGHT AS IT IS ANCHÔREO TO TI.IE STAKES. THERE SHOULD
Bg NO NOTICEABLE SAG BENVEEN STAKËS AFTER IT HAS BEEN ANCHOREO TO THE SÏAKES.
5. SILT ËENCE FABRIC SHALL BT ANCHORED TÕ THE STAKES USINO 1,' HEAVY []UIY STAPLES
OR NÀILS WITH t,'HEADS. STÀPLËS AND NAILS SHôULD ÊË PLACEO 3" ALÔN6 THE FASRIC
DOWN THE STAKE.
6. AT THE END ÔF A RUN OF SILI FENCE ALONG A CÔNTOUR, THE SILT FENCE SHOULD 8E
TURNED PERPENDICULAR TO TH€ CONTOUR TO CREATE A 'T-HOOK." THE 'T-HOÔK''
EXTENDING PERPENÐICULAR TO THE CONTOUR SHOULO BE OF SUFFICIËNT LENGTH TO KEEP
RUNûFF FROM FLÕWING AROUND THE END OF THE SlLl FENCE (TYPICALLY 10' - 20').
7, SILT FENCE SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING ACTIVITIES.
SILT FËNCE MAINTENANCÊ NOTES
1. INSFECI BMPs EACH WOfiKDAY, AND MAINTAIN Tþ|EM lN EFFECTIVE OPERAÏ|NG CONOIT|ON.
MATNTENANCE OF SMPs SHOULD BE PROACIIVE, NOT REACTIVE. INSPECI BMPs AS SOON AS
POSSTBLE (AND ALwAyS wtTt-ilN 24 HoURS) FOLLOWNG A STTRM IHAT CAUSES SUFFACË
EROSION, ANO PERFORM NECESSARY MAINTENANC€,
2. TREOUENÍ OBSERVATIONS AND MAINTENANCE ARE NECTSSARY TO MAINTÁIN EMPS IN
EFFECNVE OPERATING CONDITION, INSPECTIONS AND CORRECTIVE h¿EASURES SHOULD BE
OOCUMENTEO THOROUGHLY,
J. WHERE BMPS HAVE FAILED, REPAIR OR REFLACEMENT SHOULD BE INITIATED UPON
DISCOVERY OF THE FAILURE.
4. SED|MENT ACCUMUL,ÀTÊD UPSTREAM OF THË SILT FENCE SHALL BE REMOVED AS NEEDED
rO MAINIAIN THE FUNCTIONALITY OF THE BMP, TYPICALLY WHEN DEPIH OF ACCUMULAÏED
SEÐIMENTS IS APPFOXIMAÎELY 6'"
5. REPAIR OR REFLACE SILT FENCE WHEN THERE ARE SICNS OF WEAR, SUCH AS SAGGING.
TFÁRING, OR COLLAPSE,
6. SILT FENCE IS TO REMAIN IN PLACË UNTIL THE UPSTREAM DISTUABED AREA 15 STABILIZED
AND APFROVED BY THE LOCAL JURISOICTION, OR IS REPLACET] 8Y AN EQUIVALENT FERIMEÏER
SEDIMENT CONTROL BMP,
7, WHEN SILT FENCE IS REMOVED, ALL DISTURBED AREAS SHALL BE COVERED WTH |OPSOIL,
STEDEÛ AND MULCHED OR OTHERWSE STABILIZED AS APPROVED BY LOCAL JUR|SDICTION.
(DEIAL AÐAPÌED FñOM
'OWN
OF PARKEn, COLORÀDO A¡{O Clry OF AURORA, NOr AVALÂ8LE lN AUTOCAD)
NôTf: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARÐ DETAILS.
COÑSUIT YÍITH LOCAL JURISDICTIONS AS TO WHICH DETAÍL SHOULD 8E USED WHEN
DIFFERENCES ARE NOÏED.
SF-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB)SC.7
Description
A sediment basin is a temporary pond
built on a construction site to capture
eroded or disturbed soil transported in
storm runoff prior to discharge from the
site. Sediment basins are designed to
capture site runoff and slowly release it to
allow time for settling of sediment prior
to discharge. Sediment basins are often
constructed in locations that will later be
modified to serve as post-construction
stormwater basins.
Appropriate Uses
Most large construction sites (typically Photograph SB-1. Sediment basin at the toe of a slope. Photo
greater than2 acres) will require one or courtesyofwwE'
more sediment basins for effective
management of construction site runoff. On linear construction projects, sediment basins may be
impractical; instead, sediment traps or other combinations of BMPs may be more appropriate.
Sediment basins should not be used as stand-alone sediment controls. Erosion and other sediment
controls should also be implemented upstream.
When feasible, the sediment basin should be installed in the same location where a permanent post-
construction detention pond will be located.
Design and Installation
The design procedure for a sediment basin includes these steps:
Basin Storage Volume: Provide a storage volume of at least 3,600 cubic feet per acre of drainage
area. To the extent practical, undisturbed andlor off-site areas should be diverted around sediment
basins to prevent "clean" runoff from mixing with runoff from disturbed areas. For undisturbed areas
(both on-site and off-site) that cannot be diverted around the sediment basin, provide a minimum of
i00 ft'/a"." ofstorage for undeveloped (but stable) off-site areas in addition to the 3,600 ft3/acre for
disturbed areas. For stable, developed areas that cannot be diverted around the sediment basin,
storage volume requirements ate sunmarized in Table SB-1.
Basin Geometry: Design basin with a minimum length-to-width ratio of 2:1 (L:W). If this cannot be
achieved because of site space constraints, baffling may
be required to extend the effective distance between the
inflow point(s) and the outlet to minimize short-circuiting.
Dam Emb¿nkment: It is recommended that
embankment slopes be 4:l (H:V) or flatter and no steeper
than 3:1 (H:V) in any location.
I
Sediment Basins
Functions
Erosion Control No
Sediment Control Yes
Site/lVf aterial Manasement No
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
August 2013 SB,1
SC.7 Sediment Basin (SB)
Inflow Structure: For concentrated flow entering the basin, provide energy dissipation at the point
of inflow.
Tabte SB-1. Additional Volume Requirements for Undisturbed and Developed Tributary Areas
Draining through Sediment Basins
Imnerviousness (7o)
Additional Storage Volume (ft')
Per Acre of Tributary Area
Undeveloped 500
10 800
20 1230
30 1600
40 2030
50 2470
60 2980
70 3560
80 4360
90 s300
100 6460
Outlet Works: The outlet pipe shall extend through the embankment at a minimum slope of 0.5
percent. Outlet works can be designed using one of the following approaches:
o Riser Pipe (Simplified Detail): Detail SB-1 provides a simplified design for basins treating no
more than 15 acres.
o Orifice Plate or Riser Pipe: Follow the design criteria for Full Spectrum Detention outlets in the
EDB Fact Sheet provided in Chapter 4 of this manual for sizing of outlet perforations with an
emptying time of approximately 72 hours. In lieu of the trash rack, pack uniformly sized l% - to
2-inchgravel in front of the plate or surrounding the riser pipe. This gravel will need to be
cleaned out frequently during the construction period as sediment accumulates within it. The
gravel pack will need to be removed and disposed of following construction to reclaim the basin
for use as a perrnanent detention facility. If the basin will be used as a permanent extended
detention basin for the site, a trash rack will need to be installed once contributing drainage areas
have been stabilized and the gravel pack and accumulated sediment have been removed.
o Ftoating Skimmer: If a floating skimmer is used, install it using manufacturer's
recommendations. Illustration SB-1 provides an illustration of a Faircloth Skimmer Floating
OutletrM, one of the more commonly used floating skimmer outlets. A skimmer should be
designed to release the design volume in no less than 48 hours. The use of a floating skimmer
outlet can increase the sediment capture efficiency of a basin significantly. A floating outlet
continually decants cleanest water off the sutface of the pond and releases cleaner water than
would discharge from a perforated riser pipe or plate.
SB-2 August 2013Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB)SC-7
I
.t,
\t\l\..¡,Ñ..//
i{
..,r
(-
Illustration SB-1. Outlet structure for a temporary sediment basin - Faircloth Skimrner Floating Outlet. Illustration courtesy
of J. W. Faircloth & Sons, Inc., FairclothSkimmer'.com.
Outlet Protection and Spillway: Consider all flow paths for runoff leaving the basin, including
protection at the typical point of discharge as well as overtopping.
o Outlet Protection: Outlet protection should be provided where the velocity of flow will exceed
the maximum permissible velocity of the material of the waterway into which discharge occurs.
This may require the use of a riprap apron at the outlet location and/or other measures to keep the
waterway from eroding.
o Emergency Spillway: Provide a stabilized emergency overflow spillway for rainstorms that
exceed the capacity of the sediment basin volume and its outlet. Protect basin embankments from
erosion and overtopping. If the sediment basin will be converted to a permanent detention basin,
design and construct the emergency spillway(s) as required for the permanent facility. If the
sediment basin will not become a permanent detention basin, it may be possible to substitute a
heavy polyvinyl membrane or properly bedded rock cover to line the spillway and downstream
embankment, depending on the height, slope, and width of the embankments.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
August 2013 SB-3
SC-7 Sediment Basin (SB)
Maintenance and Removal
Maintenance activities include the following:
o Dredge sediment from the basin, as needed to maintain BMP effectiveness, typically when the design
storage volume is no more than one-third filled with sediment.
¡ lnspect the sediment basin embankments for stability and seepage.
o Inspect the inlet and outlet of the basin, repair damage, and remove debris. Remove, clean and
replace the gravel around the outlet on a regular basis to remove the accumulated sediment within it
and keep the outlet functioning.
o Be aware that removal of a sediment basin may require dewatering and associated permit
requirements.
o Do not remove a sediment basin until the upstream area has been stabilized with vegetation.
Final disposition of the sediment basin depends on whether the basin will be converted to a permanent
post-construction stormwater basin or whether the basin area will be returned to grade. For basins being
converted to permanent detention basins, remove accumulated sediment and reconfigure the basin and
outlet to meet the requirements of the final design for the detention facility. If the sediment basin is not to
be used as a peÍnanent detention facility, fill the excavated area with soil and stabilize with vegetation.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
SB-4 August 2013
Sediment Basin (SB)SC.7
03.00
F FIVE
MN
RIPRAP PAD
HOLE
DIAMETER.
HD
00.00
INLEIS TO SEDIMENT BASIN
SHATI- ENTER AT FURTHEST
DISTANCE TO OUTLTI AND SHALL
CONSIST OF A TEMPORARY SLOPE
DRAIN
SEDIMENT BASIN PLAN
*EXCEPT WHERE THE HOLES EXCEED 1,.
DIAMFTER, THEN UP TO TWO COLUMNS
OF SAME SIZED HOLES MAY BE USED
1" fo 2"
CRUSHED ROCK
RISER PIPE
6" PVC
SPILL\4'AY
SCHEDULE 40
PVC OR GREATER
EXCAVAÏION
EMBANKMENÏ
MATERIAL
050:9" RIPRAP
TYPE L. (SEE TABLE
MD-7. M¡-JOR
DRAINAGE, VOL, 1)
.--.
J-' \
RIPRAP BEDDING
Ë
SECTION A
CL
4**Q 12"
1'6"
12"
CREST LENGTH
050:9" RIPRAP TYPE L
2"
EL. 05.00
AT CREST
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
August 2013 SB-5
SC.7 Sediment Basin (SB)
TAÊLE S8_I. SIZING INFORMATION FOR STANÐÂRD SEÐIMENT EASIN
Upstreom Drainoge
Areo {rounded to
necrest ocre), {oc)
Êlosin Eottom Width
(w), (ft)
Spillwoy Crest
unçm (C¡-), (fÐ
Hole
Diometer
(t-lD), (in)
1
2
J
4
5
6
7II
10
1t
12
r3
14
t5
12k
21
28
33
38
Y2
h
+
43
7 )/+
5l
55
5A l+
6t
64
67
70
73
)r
)t
l+
2Ì
5
6I
s
1t
l2
IJ
t5
r6
t8
19
21
22
%t
'ltayl
9lezkz
Iha
27tz
27Åz
7/s
t11a
3hz
I
1 llctJâ
1 sris
sIÐIMENT BASIN INSTALLATION NÔTES
1. SEE PLAN VIEW FOR:
-LOCATION OF SEDIMENT BASIN.
-TYPE OF EASIN (STAiIDARD BASIN OR NONSÍANOARD BiSIN).
-FOR STANOARO I'ASIN, BOTTOM WIDTH W, CREST LENCTH CL, AND HOLE
DIAMETER, HÞ.
-FTR NONSTANDARD tsASIN, SEE CONSTRUCTION DRAWINGS FOR I}ESIGN OF BASIN
INCLUDING RISÊR IIEIGHI H, NUMÊER OF COLUMNS N, HOLE ÛIAMETER HD AND PIPE
DIAMETER D,
2, FOÊ STAI\DARO BASIN, EOTTOM DIMENSION MAY BE MODIfIED AS LONC AS BOTIOM AREA
IS NOT REDUCED,
3. SIDIMENT BASINS SHALL BE INSTALLED PftIOR TO ANY OTHER LANO*OISÏUFBING ACNVIry
THAT RELIES TN ON BASINS AS AS A STÕRMWÂÏER CONTROL.
4. EMBAI.¡KMENT MATERTAL SHALL CONSIST OF SOIL FREE OF DEBRIS, ORGANIC MATERIAL, AND
ROCKS OR CONCRËTE GRT}TER IHAN 3 INCHES AND SHALL HAVE A MINIMUM OF 15
PERCENT 8Y WEIGHT PASSING THE NO. 2OO SIEVE.
5. EMBANKMENT MATERIAL SHALL EE COMPACTED TÔ AT LEAST 95 PERCENT OF MAXIMUM
DENSITY IN ACCORDANCÉ WITH ASTM T6E8.
6, FIPE SCH 40 OR GREATER SHALL BE USEÐ.
7. rHE DETATLS SHOfvN ON THÉSE SHEEIS PERIAIN TO STANDARÛ SÊDIMËNI FASIN(S)
FOR DRAINAGE AREAS LESS THAN 15 ACREs. SEE CONSTRUCTION DRAWINGS FOR
EMBANKMENT, STORACE VOLUME. SPILLWAY, OUTLET, AND OUTLET PROTECTION DMALS FOR
ANy SEB|MENT EAS|N(S) THAT HAVE BEEN INÛ¡VTOUALLY 0E$|GNÊD FOR DRAINAGE AREAS
LAR6EÊ THAN 15 ACRES.
SB-6 August 2013Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Sediment Basin (SB)SC-7
SEOIMËNT BASIN MAINTENANCE NOTES
1. INSPECT BMPg EACH WORKDAY, AND MAINTAIN THEM lN EFFECTIVE OPERAIING CONÐ|T|ON.
MAINTENANCE OF BMPS SHOUTT EE PROACTIVE, NOT REACTIVE. INSPËCT 8MF9 AS SOON AS
posstBlg (AND ALWAYS WtTHtN 24 HOURS) FOLLOì¡V|NG A SToRM IHAT CAUSES SURFACE
EROSION, ANO PERFORM NECESSARY MAINTËNANCE.
2. FREQUENT OBSERVATIONS ANO MAINÍENANCE ARE NÊCESSARY TO MAINTAIN BMPS IN
EFFECTIVE OPEßATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMENTÊO THOROUGHLY,
J. WHERE BMPg HAVE FA|LE0, REPAIR 0R REPLACEMENI SHOULD ÊE lNlTlATECI UP0N
DISCOVERY ÔF lHE FAILURE.
4. SËDIMENT ACCUMULATEO IN BASIN SHALL BE REMOVED AS NEEOÊD TO MAINTAIN BMP
EFFECTTVENESS. IYP|CALLY WHEN SEDIMENT OEPTH RTACHES ONË FOOT (1,E., TWO FEEI
EELÕW THE SPILLWAY CREST).
5. SEDIMENT BASINS ARE TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBEO AREA
15 STABILIZEO AND GRASS COVER 15 ACCEPTED BY THE LOCAL JURISDICTION.
6, WHEN SEOIMENT ÊASINS ARE REMOVEO. ALL DISTURBTD AREAS SHALL BE COVEREO
WITH TOPSOIL, SEEDED ANÐ MULCHEO OR ÔTHERWISE STABILIZED AS APPROVEO 8Y
LOCAL JURISDICTION,
(oErAtLs AoAprÉD FRoM oouctls couNrY, coLoRAoo)
MANY JURISDICTIONS HAVE 8MP DETAILS TI.IAT VARY FROM UOFCD SÎANOARO DEIA¡LS.
LT WITH LOCAL JURISOICTIONS AS TO WHICH DETAIL SHOULO BE USED WHEN
DIFTÊRENCËS ARE NOTEÐ.
NOTE:
CONSU
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
August 2013 SB-7
C onstruction Phasing/Seq uencing (CP)SM.1
Description
Effective construction site management
to minimize erosion and sediment
transport includes attention to
construction phasing, scheduling, and
sequencing of land disturbing activities.
On most construction projects, erosion
and sediment controls will need to be
adjusted as the project progresses and
should be documented in the SWMP.
Construction phasing refers to
disturbing only part of a site at a time to
limit the potential for erosion from
dormant parts of a site. Grading
activities and construction are completed
and soils are effectively stabilized on one
part of a site before grading and
construction begins on another portion of the site.
Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of
land disturbing activities and the installation of erosion and sediment control practices.
Appropriate Uses
All construction projects can benefit from upfront planning to phase and sequence construction activities
to minimize the extent and duration of disturbance. Larger projects and linear construction projects may
benefit most from construction sequencing or phasing, but even small projects can benefit from
consffuction sequencing that minimizes the duration of disturbance.
Typically, erosion and sediment controls needed at a site will change as a site progresses through the
major phases of construction. Erosion and sediment control practices corresponding to each phase of
construction must be documented in the SWMP.
Design and Installation
BMPs appropriate to the major phases of development should be identified on construction drawings. In
some cases, it will be necessary to provide several drawings showing construction-phase BMPs placed
according to stages of development (e.g., clearing and grading, utility installation, active construction,
final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area
associated with phases of a construction project. Additionally, requirements for phased construction
drawings vary among local governments within the UDFCD boundary. Some local govemments require
Photograph CP-1. Construction phasing to avoid disturbing the
entire area at one time. Photo courtesy of WWE.
separate erosion and sediment control drawings for initial
BMPs, interim conditions (in active construction), and final
stabilization.
Construction Scheduling
FunctÍons
Erosion Control Moderate
Sediment Control Moderate
S iteMaterial Management Yes
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 CP-1
SM.1 Construction Phasing/uencrng (CP)
Typical construction phasing BMPs include:
. Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a
1O0-acre subdivision might be constructed in five phases of 20 acres each.
If there is carryover of stockpiled material from one phase to the next, position calryover material in a
location easily accessible for the pending phase that will not require disturbance of stabilized areas to
access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful
planning for location of stockpiles is important.
Typical consÍuction sequencing BMPs include:
. Sequence construction activities to minimize duration of soil disturbance and exposure. For example,
when multiple utilities will occupy the same trench, schedule installation so that the trench does not
have to be closed and opened multiple times.
Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion
control blankets) as soon as feasible following grading.
Install initial erosion and sediment control practices before construction begins. Promptly install
additional BMPs for inlet protection, stabilization, etc., as construction activities are completed.
Table CP-l provides typical sequencing of construction activities and associated BMPs.
Maintenance and Removal
V/hen the construction schedule is altered, erosion and sediment control measures in the SWMP and
construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the
construction site. Be aware that changes in construction schedules can have significant implications for
site stabilization, particularly with regard to establishment of vegetative cover.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
CP-2 November 2010
Construction Phasing/Sequencing (CP)SM.1
Table CP-1. Typical Phased BMP Installation for Construction Projects
Project
Phase
BMPs
Pre-
disturbance,
Site Access
¡Install sediment controls downgradient of access point (on paved streets this may consist
of inlet protection).
Establish vehicle tracking control at entrances to paved streets. Fence as needed.
Use construction fencing to define the boundaries of the project and limit access to areas of
the site that are not to be disturbed.
Note: it may be necessary to protect inlets in the general vicinity of the site, even if not
downgradient, if there is a possibility that sediment tracked from the site could contribute
to the inlets.
Site Clearing
and Grubbing
Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles,
etc).
Limit disturbance to those areas planned for disturbance and protect undisturbed areas
within the site (construction fence, flagging, etc).
Preserve vegetative buf"fer at site perimeter.
Create stabilized staging area.
Locate portable toilets on flat surfaces away from drainage paths. Stake in areas
susceptible to high winds.
Construct concrete washout area and provide signage.
Establish waste disposal areas.
Install sediment basins.
Create dirt perimeter berms and/or brush barriers during grubbing and clearing.
Separate and stockpile topsoil, leave roughened and/or cover.
Protect stockpiles with perimeter control BMPs. Stocþiles should be located away from
drainage paths and should be accessed from the upgradient side so that perimeter controls
can remain in place on the downgradient side. Use erosion control blankets, temporary
seeding, and/or mulch for stockpiles that will be inactive for an extended period.
Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary
revegetation for areas ofthe site thathave been disturbed but that will be inactive for an
extended period.
Water to minimize dust but not to the point that watering creates runoff.
I
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 CP-3
SM.1 Construction Phasing/Sequencing (CP)
Project
Phase
BMPs
Utility And
Infrastructure
Installation
In Addition to the Àbove BMPs:
. Close trench as soon as possible (generally at the end ofthe day).
' IJse rough-cut street control or apply road base for streets ttrat will not be promptly paved.
. Provide inlet protection as streets are paved and inlets are constructed.
. Protect and repair BMPs, as necessary.
. Perform street sweeping as needed.
Building
Construction
In Addition to the Above BMPs:
Implement materials management and good housekeeping practices for home building
activities.
Use perimeter controls for temporary stockpiles from foundation excavations.
For lots adjacent to streets, lotline perimeter controls may be necessary at the back of
curb.
Final Grading
In Addition to the Above BMPs:
. Remove excess or waste materials.
. Remove stored materials.
Final
Stabilization
In Addition to the Above BMPs:
. Seed and mulch/tackify.
. Seed and install blankets on steep slopes.
. Remove all temporary BMPs when site has reached final stabilization.
CP-4 November 2010Urban Drainage and Flood Control District
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.
Appr op r iate 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
parlicularly important during the following conditions:
. 'Wet weather periods when mud is easily tracked off site.
. During dry weather periods where dust is a concern.
. .When poorly drained, clayey soils are present on site.
Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at
particularly muddy sites.
Design and Installation
ConsÍuct 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, lo direct construction
vehicles to the designated exit through the vehicle tracking control. There are several different types of
stabilized construction entrances including:
VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the most common vehicle tracking control, and when properly maintained can be
effective at removing sediment from vehicle tires.
VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over
vegetated areas. Although this application does not typically remove sediment from vehicles, it helps
protect existing vegetation and provides a stabilized entrance
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Siteffaterial Management Yes
Photograph VTC-I. A vehicle tracking control pad constructed with
properly sized rock reduces off-site sediment tracking.
Urban Drainage and Flood Control District
Urban Stom Drainage Criteria Manual Volume 3
November 2010 VTC-1
SM-4 Vehicle Tracking Control (VTC)
VTC-3. Stabilized Construction Entrance/Exit with Wheel \üash. This is an aggregate pad, similar'
to VTC-|, but includes equipment for tire washing. The wheel wash equipment may be as simple as
hand-held power washing equipment to more advance proprietary systems. When a wheel wash is
provided, it is important to direct wash water to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenance and Removal
Inspect the area for degradation and
replace aggregate or material used for a
stabilized entrance/exit as needed. Ifthe
area becomes clogged and ponds water,
remove and dispose of excess sediment
or replace material with a fresh layer of
aggfegate 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.Photograph VTC-2. A vehicle tracking control pad with wheel wash
facility. Photo courtesy of Tom Gore.
Ensure that drainage ditches at the
entrance/exit area remain clear.
A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to
discharge. Also inspect channels conveying the water from the wash area to the sediment trap and
stabilize areas that may be eroding.
When a construction entrance/exit is removed, excess sediment from the aggregate should be removed
and disposed of appropriately. The entrance should be promptly stabilized with a permanent sutface
following removal, typically by paving.
Urban Drainage and Flood Control District
Urban Stotm Drainage Criteria Manual Volume 3
YTC-2 November 2010
Vehicle Tracking Control (VTC)SM-4
VTC
SIDEWALK OR OTHER
PAVEO SURFAC€
50 FOOT (MrN
20 FOOï
(wlDÏr{ cAN BE
LESS IF CONST
VEHICLES ARE
PHYSITALLY
CONFINED ON
BOTH SIOES)
e" (MrN.)
UNLESS OÎHERWISE SPECIFIED
BY LOCAL JURISOICTION, USÊ
cDoT sËcT. #703, AASHT0 #3
COARSE AGGREGATE OR 6"
MINUS ROCK
PUBLIC
ROAD$/AY
INSTALL ROCK FLUSH WIÏH
OR BTLOW TOP OF FAVEMENT
NON-WOVEN GEOTÊXTILE FABRIC
BETWEIN SOIL AND ROCK
UNLESS OTHERWISE SPECIFIED BY LOCAL
JURtsDtcrtoN, usE cDoT sEcT. #705, AASHT0
#3 COARSE ACGRETATE
OR 6.. MINUS ROCK I
T
NON_WOVIN GEOÏEXÏILE
FAERIC
9" (MrN.)
COMPACTED SUBCRADE SECTION A
WC_ 1. AG TGATE VEHICLI TRACKI
November 2010
G CONTROL
VTC-3Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC)
C
WW
PUBLIC
ROADWAY
DITCH TO CARRY
WASH WATER TO
SEDIMENT ÏRAP
OR BASIN
DRAIN SPACE
NOT€: WASH WATER
MAY NOT CONTAIN
CHEMICALS OR SOAPS
WITHÕUT OBTAINING
A SEPÀRATI PERMIT WÀSH RACK
RÉINFORCËD CONCRETE
(MAY SUBSTITUTE STEEL CATTLE
GUARD FOR CONCRETÊ RACK)
SECTI ONA
VTC-2. AGGR FGATE VTHICLE TRACKING C ONTROL WITH
WASH RACK
VTC-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Vehicle Tracking Control (VTC)SM-4
10u À4AX-
DISTURBED AREA,
CONSTRUCTION SITE.
STABILIZEO STORAGE ARIA
OR SÏAGING AREA
EXISÏNG
PAVEÛ
ROAOWÂY
CONSTRUCTION MAÍS, WOVEN OR TRM
SPIKES OF
SÏAKES
CONSÍRUCTION MATS, WOVEN
OR TURF REINFTRCEMENT ETRAP
CONNECTORS
RESTRICT CONST. VEHICLE
ACCESS TO SIDES OF MAT
TRM END OVERLAP WITH
SPIKES OR SÎAKES
CONSTRUCTION MAÏ ENO
OVERIAP INTERLOCK WITH
STRAP CONNECTORS
o\o
I ra" u,n I
MAT (TRM)
2A'
I
I
OR AS REQUIRED
TO ACCOMMODATE
ÀNÏICIPATED
TRAFFTC (wrDrH
CAN BE LESS IF
CONST, VEHICLES
ARE PHYSICÁLLY
CONFINED ON 8OÏH
sroES)
VTC_5. VEHIC TRACKING CONTROL W /CONSTRUCTION
=ı
ot
¿5t!
(L
(5
z,Fitt
><ùJ
T
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 VTC-5
SM.4 Vehicle Tracking Control (VTC)
STABILIZED CONSTRUCTIÔN ENTRANCE,/EXIT INSTALLATIÔN NOTES
1. SEE PLAN VIEW FOR
-LOCATION OF CONSTRUCTION ENTRANCE(S)/EXIT(S).
-ryPE OF CONSIRUCTIÔN €NÏRÀNCE(S)/EXITS(S) (wlTH/wIHOuT WHEEL WASH,
CONSTRUCTION MAT ÔR TRM).
2. CONSTRUCTION MAT ÛR TRM STAEILIZED CûNSTRUCTION ENTRANCES ARE ONLY TO BE
usED ON SHORT DURATIoN PROJECIS (TypICALLY RANGING FROM A WEEK T0 A MONTH)
WHERE THERE WLL B[ LIMITED \TEHICULAR ACCESS.
3. A STABILIZEO CoNSTRUCTION ENTR¡Ú\CEIEXIT SHALL BE LOCATEO AT ALL ACCESS POINTS
WHEÊE VEHICLES ACCESS THE CONSÎRUCTION SITE FROM FAVED RIGHT_OF_WAYS.
4. STABTLTZED CONSTRUCT|ON ENTRANCEy'EXTT SHALL BE INSTALLEo PRI0R ïO ANY LAND
DISTURBING ACTHITIES,
5. A NON-WOVEN GEOTEXTILE FABRIC SHÀLL 8E PLÀCED UNDER THE STABILIZED
CONSTRUCTION ENTRANCË//EXIT PÊIOR TÔ THE PLACEMENT OF ROCK,
6. UNLESS OTHERWISE SPECIFIED EY LOCAL JURISOICÍION, ROCK SHALL CONSIST OF DOT
sEcT. #703, AASt-tlO #l COARSE ACcREGATE OR 6" (M¡NuS) RoCK.
SIABTLTZED CONSIRUCTION ENIRANCE/€XII MAINTENANCE NOÏÊS
1. INSPECT BMFs EACH WORKDAY, AND MAINTAIN THEM lN EFFËCTIVE OPERAÏ|NG CONDITION.
MAINTENANCE OF BMPS SHOULT BE PROACTIVE, NOT REACTIVE, INSPECT BMPS AS SOON AS
POSS|BLE (AND ALWAYS WtTHtN 24 HoURS) FOLLOWING A SÍORM IHÀf CAUSÊS SURrÂCE
EROSION, AND FERFOÊM NECESSARY MAINTENANCE.
2. FREQUENÎ OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPS IN
EFFECTIVE OPERATING CÔNDIÍION. INSPECTIONS ANO CORRÊCTIVE MEASURES SHOULD BE
TOCUMENTED THOROUGHLY,
3, WHERE BMPS HAVE FÀILID, REPAIR OR REPLACEMENT SHOULO BE INIIIATED UPON
DISCOVERY OF THE FAILURE.
4. ROCK sHÀLL EE REAPPLIEÐ OR REGRADED A5 NECÊSSARY TO THE STABILIZED
ENIRANCE/EXII TO MAINTAIN A CONSISTENT DEPÍH.
5. SEDIMENT TRACKED ONTO PAVED RÔADS ¡S TO BE REMOVEO THROUGIIÔUT THE ÐAY AND
AT THE ËND ÕF IHE DÀY BY SHOVETìNG OR SWEEPING. SEDIMENT MAY NOT BE WASHID
DOWN SIORM SEïVER DRAINS,
NOÏE;
c0Nsu
MANY JURISDICTIONS HAVI BMP OETAILS THAT VARY FRÕM UDFCD STANOARD DETAILS,
LT WITH LOCAL JURISDICTIONS AS TO WHICH OETAIL SHOULD BE USEO WHEN
DIFFERENCES ARË NOÏED.
(oErArLs Ao^PrED FROM ClrY OF BROOMFIEL0, COLORADo. NOT AVAIIABLE lN AUTCCAo)
VTC_6 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Stabilized Staging Area (SSA)SM.6
Description
A stabilized staging area is a clearly
designated area where construction
equipment and vehicles, stockpiles, waste
bins, and other consffuction-related
materials are stored. The contractor
office trailer may also be located in this
area. Depending on ttre size of the
construction site, more than one staging
area may be necessary.
Appropriate Uses
Most construction sites will require a
staging area, which shOuld be cleady Photograph SSA-1. Example of a staging area with a gravel surface to
aesigrratea in SWMp drawings. Thá layout prevent mud tracking and reduce runoff. Photo courtesy of Douglas
of the staging area may vary ãepending on countv'
the type of construction activity. Staging areas located in roadways due to space constraints require
special measures to avoid materials being washed into storm inlets.
Design and Installation
Stabilized staging areas should be completed prior to other construction activities beginning on the site.
Major components of a stabilized staging area include:
. Appropriate space to contain storage and provide for loading/unloading operations, as well as parking
if necessary.
' A stabilized surface, either paved or covered, with 3-inch diameter aggregate or larger.
. Perimeter controls such as silt fence, sediment control logs, or other measures.
r Construction fencing to prevent unauthorized access to construction materials.
. Provisions for Good Housekeeping practices related to materials storage and disposal, as described in
the Good Housekeeping BMP Fact Sheet.
. A stabilized construction entrancefexit, as described in the Vehicle Tracking Control BMP Fact Sheet,
to accommodate traffic associated with material delivery and waste disposal vehicles.
Over-sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that
required for the project. This increases costs, as well as
requirements for long-term stabilization following the
consffuction period. When designing the stabilized staging area,
minimize the area of disturbance to the extent practical.
Stabilized Staging Area
Functions
Erosion Control Yes
Sediment Control Moderate
Site/N4aterial Yes
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SSA-1
SM-6 Stabilized Sta Area (SSA)
MÍnimizing Long-Term Stabilization Requirements
Utilize off-site parking and restrict vehicle access to the site.
Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed
otherwise.
Consider use of a bermed contained area for materials and equipment that do not require a
stabilized surface.
Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise
disturbed.
See Detail SSA-1 for a typical stabilized staging area and SSA-2 for a stabilized staging area when
materials staging in roadways is required.
Maintenance and Removal
Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing
perimeter controls, and following good housekeeping practices.
When construction is complete, debris, unused stockpiles and materials should be recycled or propedy
disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an
appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface
cover planned for the development.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
SSA-2 November 2010
Stabilized Staging Area (ssA)SM-6
)i
STbKAGE
ATIEA
4
CONSTRUCI]ON
SITE ACCÊSS
q
q
Ir4\Õ
1-tl
\t
rl
I
sF/cr
-
sF/cF
sF/cF
-
sF/cF
CONSÏRUCTION
TRAILËRS
l"L(J
t!(tt
tL(J
t!tn
STABILIZÊD
CONSTRUCTION
ENTRÀNCE (SEE
ÛETAILS VTC_1
IO WC-3)
POSSIBLE
EROSION,
J" MtN. THtcKNEss
GRANULAR MATERIAL
SILT FENCE OR CONSTRUCNON
FENCING AS NEEDET
EXISTINC ROADV'¿AY
SSA- 1 . STABILIZTD STAGING AREA
STABILIZED SÍAGING AREA INSTALLATIqN NOÏES
1, SEE PLAN VIEW FÔR
-LOCATTON OF STAGTNG AREA(S).
-CONTRACIOR MAY ADJUST LOCATION ANO SIZE OF SÏAGING AREA WITH APPROVAL
FROM THE LOCAL JURISOICÏION.
2. STABILIZED SÎAGING ARF} SHOULD BE APPROPRIATE FOR THf NEEOS OF THE SIÏE.
OVERSIZING RESULTS IN Ä LARGER ARËA TO STABILIZE FOLLOWING CONSTRUCTION.
3. STAGING AREA SHALL BE STABILIZED FRIOR TO OTHER OPERATIONS ON THE SIÏ8.
4. THE STABILIZED STAGING AREA SHALL CONSIST OF A MINIMUM 5,. THICK GRANUL,AR
MATERIAL.
5, UNLESS OTIjERWSE SPECIFIEO ÊY LOCAL JURISDICÍION, ROCK SHALL CONSIST OF DOÏ
sEcT, #703, AASHTO #3 COARSE AGCREGATE OR 6" (MINUS) ROCK.
6. ADDITIONAL PERIMEIER BMPs MAY BE REQUIRËD INCLUDING BUT N0ï LIMITED T0 SILï
FENCE AND CONSTRUCTION FENCINC.
STABILIZEÐ STAGING AREA MA¡NÍENÀNCE NÛÎES
L INSPECI BMPg EACH WORKDAY, AND MAINTAIN lH[M lN EFFECTIVË OPERATING CONO|I|ON
MAINIENANCE OF BMFs SHTULD Bã PRôACilVE, NOT REACTIVE. INSPECï BMFs AS SOON AS
(ANÛ ALWAYS WITHIN 24 HOURS) FOLLOWNG A STORM THAT CAUSES SURFACE
ANÐ PERFORM NECESSARY MAINTENANCE.
2. FREQUENI OBSERVATIONS AND MAINTENANCE ARE NECESSARY ÏO MAINTAIN EMPs lN
EFFECTiVE OPERATING CONÐITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMENTED THOROUGHLY.
3. WHIRT BMPs HAVE FAlLtD, REPAIR 0R ÊEPLACEMENI SI-IOULD Bt INITIATED UPON
OISCOVERY ôF THE FAILURE-
4, ROCK SHALL BE REAPPLIED OR REGRAÛED AS NECESSARY IF RUTTING OCCUfiS OR
UNDERLYING SUBCRADE BECOMES EXPOSED.
SSA
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SSA-3
SM.6 Stabilized Staging Area (SSA)
SIABILIZËD SÎAGING ARËA MAINI-ENANCË NOIES
5, STABILIZED STAGING AREA SHALL BE ENI-ARGED IF NECESSARY TO CONTAIN PARXINS,
STORAGE, AND UNLOADING,/LOATING ÛP€RATIONS.
6. lHE STABILIZEÕ STAGING AREA SHALL åE REMOVED AT THE END OF CONSTRUCTION. ÏHE
CRANULAR MATIRIAL sHÀLL BE REMOVED OR, IF APPROVED BY THE LOCAL JURISDICTION,
USËD ON SITE, AND THE ARTÁ CÔVEREO WITH TOPSOIL, SEEOEO AND MULCHED OR
OTHERW¡SE STAEILIZED IN A MANNER APPROVED BY LOCAL JURISDICTION.
NÕÎEr MANY MUNICIPALIII€S PROHIÉ|I IHÊ uSE OF RECYCLED CONCREIE AS GRANULAR
MATËRIAL FOR STABILIZED sTÀGING AREAS DUE TO DIFFICULTES WITH RE-ESIABLISHMÊNT OF
VEGETATION IN AREAS WHERE BECYCLTO CONCREIE WAS PLACEO.
NOJE MANY JUR|S0|CT|CNS HAVE BMP DEIÀ|LS IHAÏ VARY FROM UDFCD STANOARD DnAILS
CONSULT WITH LOCAL JURISDICTONS AS TO WHICH ÐETAIL SHOUTD BE USEO WHEN
DIFFERENCÊS ARE NOTED.
{oETAlLs A0APfE0 FRoM ooucL¡s¡ couNrv. coloñAûo. NoI ÂvAlttÊllÊ lN AUTocAo}
SSA-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Street Sweeping and Vacuuming (SS)SM-7
Description
Street sweeping and vacuuming remove
sediment that has been tracked onto
roadways to reduce sediment transport
into storm drain systems or a surface
waterway.
Appropriate Uses
Use this practice at construction sites
where vehicles may track sediment
offsite onto paved roadways.
Design and Installation
Photograph SS-1. A street svr'eeper removes sediment and potential
street sweeprng or vacuuming should be +:t*tå:i","t"g
the curb line at a construction site' Photo courtesv of
conducted when there is noticeable
sediment accumulation on roadways adjacent to the construction site. Typically, this will be concentrated
at the entrance/exit to the construction site. Well-maintained stabilized construction entrances, vehicle
tracking conÍols and tire wash facilities can help reduce the necessary frequency of street sweeping and
vacuuming.
On smaller construction sites, street sweeping can be conducted manually using a shovel and broom.
Never wash accumulated sediment on roadways into storm drains.
Maintenance and Removal
Inspect paved roads around the perimeter of the construction site on a daily basis and more
frequently, as needed. Remove accumulated sediment, as needed.
Following street sweeping, check inlet protection that may have been displaced during street
sweeping.
Inspect area to be swept for materials that may be hazardous prior to beginning sweeping operations
t
Street Sweeping/ Vacuuming
Functlons
Erosion Control No
Sediment Control Yes
S iteÀ4aterial Manasement Yes
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SS-1
Concrete \tashout Area (C\ilA)MM-1
Description
Concrete waste management involves
designating and properly managing a
specilic area of the construction site as a
concrete washout area. A concrete
washout area can be created using one of
several approaches designed to receive
wash water from washing of tools and
concrete mixer chutes, liquid concrete
waste from dump trucks, mobile batch
mixers, or pump trucks. Three basic
approaches are available: excavation ofa
pit in the ground, use of an above ground
storage area, or use ofprefabricated haul-
away concrete washout containers.
Surface discharges of conctete washout
water from construction sites are prohibited.
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
Photograph CWÀ-l. Example of concrete washout area. Note gravel
tracking pad for access and sign.
Appropriate IJses
Concrete washout areas must be designated on all sites that will generate concrete wash water or liquid
concrete waste from onsite concrete mixing or concrete delivery.
Because pH is a pollutant of concern for washout activities, when unlined pits are used for concrete
washout, the soil must have adequate buffering capacity to result in protection of state groundwater
standards; otherwise, a liner/containment must be used. The following management practices are
recommended to prevent an impact from unlined pits to groundwater:
. The use of the washout site should be temporary (less than 1 year), and
The washout site should be not be located in an area where shallow groundwater may be present, such
as near natural drainages, springs, or wetlands.
Design and Installation
Concrete washout activities must be conducted in a manner that does not contdbute 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
Concrete Washout Area
Functions
Erosion Control No
Sediment Control No
Site/Material Management Yes
November 2010 CWA-1Urban Drainage and Flood Conftol District
Urban Storm Drainage Criteria Manual Volume 3
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 are provided in Detail CWA-I for pits and CWA-2 for aboveground storage
areas. Pre-fabricated concrete washout container information can be obtained from vendors.
Maintenance and Removal
A key consideration for concrete washout areas is to ensure that adequate signage is in place identifying
the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is being used, as opposed to
washout in non-designated areas of the site.
Remove concrete waste in ttre washout area, as needed to maintain BMP function (typically when filled to
about two-thirds of its capacity). Collect concrete waste and deliver offsite to a designated disposal
location.
Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any
contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. ff the wash
water is allowed to evaporate and the concrete hardens, it may be recycled.
Photograph CWA-2. Prefabricated concrete washout. Photo
courtesy of CDOT.
Photograph C\ryÄ-3. Earthen conüete washout. Photo
courtesy of CDOT.
CV/A-2 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Concrete'Washout Area (C\MA)MM-1
CONCRETE WASHOUT
SIGN
CONCRETE WASHOUT AREA PLAN
COMPÂCTED BERM AROUNO
THE PERIMETËR
3' MlN.
VEHICLf TRACI(ING
coNTRoL (SEE
wc DËfArL) oR
OÏHER SÏA8LE
SURFACE
21ú SL0PE
12'' TYP
>4
UNDISTURBËÐ ÔR
COMPACTEO SÔIL 8X8MIN VEHITLE TRACKING
CoNTROL (SEE vIC
oEIAtL )STCTION A
CT/VA- 1 . CONCR WASHOUT ARIA
CWA INSTALLATIÔN NOTES
1. SEE PI.-AN VIEW FOR:
_CWA INSTALLATION LOCATION
2, ÐO NOT LOCATE AN UNLINED CWA WITHIN 4OO' OF ANY NÀTURAL DRAINAGE PATHWÀY OR
WATERBOBY. BO NOT LOC,ATE WITHIN 1,OOO' OF ANY WELLS OR DRINKINC WATER SOURCES. IF
SITË CÔNSTRAINTS MAKE THIS INFEASIBLE, OR IF HIGHLY PERMEAÊLE SÔILS EXIST ON SIÏ8,
THE CWA MUSI BE TNSTALLED WITH AN IMPERMfÁBLE LINER (16 MIL MlN. THICI<NES5) OR
SURFACE STORAGE ALTERNATIVTS USING PREFABRICATED CONCRETE WASHOUT DEVICES OR A
LINED ABÔVÊ GROUND STORACE ARE SHOULD BE USEO.
3. THE CWA SHALL 8E INSTALLED PRIOR TO CONCRr|-E PLACEMËNÏ ON SITE"
4. CWA SHALL INCLUI}E A FLAT SUBSURFACI PII THAT IS AT LEAST 8. BY B, SLOPES
LEADING OUT OF THE SUBSURFACE PIT SHALL BE 3:1 OR FLATTER. THE PIT SHALL BE AT
LEASI 3' OEEP.
5. BãRM SURROUNÊING SIDES AND BACK OF THE CWÀ SHALL HAV€ MIÑIMUM HEIGHT OF 1'
6, VEHICLE TRACKING PAD SHALL BE SLOPEÐ 2% TOïIARDS ÏHE CWA.
7. SIGNS SHALL BE PLACED AT THE CONSTRUCTION ENTRANCE, A1 THE CWA, AND
ELSEWHERE A5 NECESSARY TO CLEARLY INDICATE THE LOCATION OF THE CWA ÏO OPERATORS
OF CONCRËTE TRUCKS AND PUMP RICS.
E. USE EXCAVATED MATERIAL FOR PEÊIMETER BERM CONSTRUCTION,
CWA
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 CWA-3
MM.1 Concrete Washout Area (C\ilA)
CWÀ MAINTENANCE NOTES
1. INSPECI BMPÉ EACH WORKDAY, AND MAINTAIN IHEM lN EFFECTIVE OPERAIING CONDITION,
MAINIENAßICE OF BMPs SHOULO BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS
Ptss¡BLE {AND ALWAYS W|THIN 24 HoUÊS) FOLLOWNG À STÔRM THAT CAUSES SURFACE
ERÔSION, AND PERFORM NECESSARY MAINIENANCE-
2. FREQUENT OBSERVATIONS AND MAINTENANCE ARË NECISSARY 10 MAINTAIN ÊMPS IN
EFFECNVE OPERATING CONDITION. INSPECNONS AND CORRECTIVE MEASURES SHOULD BE
DOCUMËNÎED THOROUGHLY,
¡" WHERE BMFs HAVË FAILED, REPAIR oR REPLACEI'jENÌ SHOULD BE INITIATEÞ UPON
DISCOVERY OF THE FAILURE,
4, THE CI¡'¡A SHALL 8E REPAIRED, CLEANED, ÕR ENLARGEO AS NICÊSSARY fO MAINTAIN
CAPACITY FOR CONCRETE WASTE. CONCRETE MATERIALS, ACCUMULATEO IN PIT, SHALL BE
RËMOVID ONCE THE MATERIALS HAVE REACHED A DEPTH OF 2"
5, CONCRETI WASHOUT WATER, WASTED PIECES OF CONCRETE AND ALL OTHER DESRIS
IN THE SUBSURFACE PIT SHALL 8E TRANSPORTED FROM THE JOB SITE IN A WATER-TIGHT
CONTAINER AND ÞISPOSED OF PROPERLY.
6. THË CWA SHALL REMAIN IN PLACE UNTIL AI-L CONCRETE FOR ÏHE PROJECÏ IS PLACEÐ.
7, WI.IEN THE CWA IS REMOVED, COVER THE DISTURBEO ARÉA \4'ITH TOP SûIL, SEED AND
MULCH OR OTHERI¡\IISE STABILIZID IN A MANNER APPROVED BY THÉ LOCAL JURISDICÍION.
(DErÀL A0APTËD FFOM ooUGLÀS COUNfy, CoLoRAoo AND THE ClTv 0F PÀFI{ER, COLORADO, NOT AVATLA€LE lN
^UTOC¿Ð).
NOTE: MANY JURISDICfiONS HAVÊ BMP DETAILS Tl-lAT VARY FROM UDFCD STANûARD DEIAILS
CÔNSULT WITI] LOCAL JURISDICTIÛNS AS TÔ WHICH ÐÉTAIL SHOULD BE USED WHEN
DIFFERENCES ARE NOTED.
CWA-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Stockp ile Management (SP)MM-2
Description
Stockpile management includes
measures to minimize erosion and
sediment transport from soil stockpiles.
Appropriate Uses
Stockpile management should be used
when soils or other erodible materials
are stored at the construction site.
Special attention should be given to
stockpiles in close proximity to natural
or manmade storm systems.
Design and Installation
Photograph SP-l. A topsoil stockpile that has been partially
revegetated and is protected by silt fence perimeter control.
Locate stockpiles away from all drainage system components including storm sewer inlets. Where
practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the
phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such
as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-l for guidance
on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a
stabilized designated access point on the upgradient side of the stocþile.
Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control
blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should
be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14
days). Use of mulch only or a soil binder is acceptable if the stocþile will be in place for a more limited
time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are
"typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that
may be more prescrþtive.
Stockpiles should not be placed in streets orpaved areas unless no other practical alternative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to
space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all
inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be
protected.
Maintenance and Removal
Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets.
Where seeding, mulch andlor soil binders are used, reseeding or reapplication of soil binder may be
necessary.
Stocknile Manasement
Functions
Erosion Control Yes
Sediment Control Yes
SiteMaterial Manaqement Yes
When temporary removal of a perimeter BMP is necessary
to access a stockpile, ensure BMPs are reinstalled in
accordance with their respective design detail section.
Urban Drainage and Flood Conrol District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SP-1
MM.2 Stockp ile Management (SM)
When the stockpile is no longer needed, propedy dispose of excess materials and revegetate or otherwise
stabilize fhe ground surface where the stockpile was located.
)
sP-2 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Stockp ile Management (SP)MM-2
STOCKPILE
3.O' MtN
stLr FENCE (SEE SF DETATL FOR
TNSTALLAT|ON REOUTREMENIS)
----
2
MAXIMUM
SILÍ FENCE (SEE SF DETAIL FOR
TNSTALLAITON REQUTREMENTS)
SECTION A
SP- 1 . STOCKPI LE PROTECTION
STOCKPILE PROTECTION INSTALI-ATION NOTES
1. SEE P$N VIIIY FOR:
_LOCATION OF STOCKPILES,
-TYPE OF STOCKPILE PROTECNON
2. INSTALL PERIMEÍER CONTROLS IN ACCORDANCE WIIH THÉIR RESPECTIVE DESIGN DETAILS.
SILT FENCE IS SHOWN IN THE STOCKPILE PROTECTION DETAILS: HOWEVËR, OÏHER TYPES OF
PERIMETER CONTROLS INCLUDING SEDIMENT CONTROL LOGS OR ROCK SOCKS MAY BE
SUITABLE IN SÔME CIRCUMSIA¡{CES. CONSIOERATIONS FÔR DETERMINING THE APFRÔPRIATE
TYPE OF PERIMETER CONTROL FOR A STOCKPILE INCLUDE WHETHER ÏHE STOCKPILE IS
LOCATED ON A PERVIOUS OR IMPERVIOUS SURFACI, THE RELATIVE HEIGHTS OF THE
PERIMETER CONTROL ANO STCCKPILE, THE AËILITY OF THE FERIMETËÊ CONTRÔL ÏO CONIAIN
THE STOCKPILE W¡THOUT FAIUNG IN THE EVENT THAT MATERIÀL FROM THE STOCKPILE SH TS
OR SLUMPS AGAINST IHE PERIMETIR, AND OTHER FACTORS.
3. STABILIZE THE STTCKPILE SURFACE WTI.I SURFACE ROUGHENING, TEMPÛRARY SEETING AND
MULCHING, EROSION CONTROL BLANKFÍS, OR SOIL BINÐERS. SOILS STÕCKFILED FOR AN
EXIENDID pERtOD (TyptCALLy FOR MORE THÀN 60 tAyS) SHOULD 8E SEEûED ANU MUTCHED
wTH A IEMPôÊARY CRASS COVER ONCE IHE STOCKPTLE rS PLACED (TYPTCALLY WITHTN 14
oÀys). usE oF MULCH ONLY OR A SorL BTNDER lS ACCEPTABLE lF IHE STOCKPILE WILL BE
tN FLACE FOR A MORE LtMtTEt TIME PERIOO (TYPICALLY 30-60 DAYS).
4. FOR TEMPORARY STOCKPILES ON THE INTERIOR PORTION OF A CONSÏRUCTION
OTHER ÛOWNGRADIENT CONTROLS, INÇLUD¡NT PERIMËTER CONTROL, ARE IN PLACÉ,
PERIMETËR CONTROLS MAY NOI BË REQUIFED,
SITE, WHERE
SIOCKPILE
Urban Drainage and Flood Control District
Urban Storrn Drainage Criteria Manual Volume 3
November 2010 SP-3
MM.2 Stockp ile Management (SM)
STOCKPILE PROTECTIÔN MAINTÉNANCÊ NOTES
1, INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM lN EFFECTIVE OPERATING CONOlTlOl.l,
MAINTENANCE OF SMPs SHOULD BE PROACTIVÊ, NOT REACIIVE. INSPECI BMPs AS SOON AS
FOSSTBLE (AND ALWAYS W|THIN 24 HOURS) FÛLLÔWNG A STÔRM THAÎ CAUSES SURFACÉ
EROSIÔN, AND P€RFORM NECESSARY MAINTENANCE.
2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NEC€SSARY TÔ MAINTAIN ÊMPs lN
EFFECTIVE OPERATING CONDITION. INSPECNONS ANÛ CORRECTTVE MEASURES SFIOULD BE
DOCUMENÎED ÎHOROUGHLY,
3. WHERE BMPg HAVE FA¡LED, RËPAIR oR REPLACEMENI SH0ULD ÊE |N|ÏIAIED UFoN
DISCOVIRY OF THE FAILURE.
SÎOCKPILE PROIECTION MÀINTENANCE NOTËS
4. IF PERIMET€Ê PRÛTECTION MUST BE MOVED TO ACCËSS SOIL STOCKFILE, REFLACE
FERIMETTR CONTROLS BY THE END OF THE WORKDAY.
5, STOCKPILE PERIMETER CONTROLS CAN BE REMOVÊD ONCE ALL THE MATERIAL FROM THE
STOCKPILE HAS BEEN USED.
(DETALS À0APÍED FROM P¡'RKER, COL0Ê400, Nor AVÀ|LA8LE lN NJfoc^o)
NOlE:
CTNSU
MANY JURISDICNONS HAVË BMP DETÀILS THAT VARY FROM UDFCD SÏANDARÐ DEÎAILS
LT WITH LOCAL JURISÙICTIONS AS TO WHICH ÐÊTAIL SHOULD ÊE USED WHËN
DIFFERENCES ARE NÔTËD.
SP-4 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Stockp ile Management (SP)MM-2
ãEIIJo POLY TARP
BERM
(pmB
ORANGE SAFETY
CONE
RÔADWAY
TARP ANCHOR
ROAD CL
BERM MAÏERIAL
(TRTANGULAR S|LT O[KE,
SEÛIMENT CONTROL LOG.
ROCK SOCK. OR OTHER
WRApFED MATERTAL)
POLY LINER
POLY TARP
I 6' MAX., MUST NOT I
I - BE LOCATED WITI.IIN
A DRI\Æ I-ANE
SOIL/iLANDSCAPE
MATERIAL
6.' PVC PIPE
FOR DRAINAGE
IN FLOWLINE
CURS LINÊ
X
I
X
6' MAX,
6,.MIN
TARP ANCHOR (C|NDER
ÊLOCK. OR 5 GALLON
BUCKET OF WATER)
FOLY LINER
6., PVC PIPE
SP_2. MATTRIALS STAGING IN ROADWAY
MATERIALS STAGING IN ROATWAYS INSTALLATION NOTES
1. SEE PLAN VIËW FOR
-LOCATIÔN OF MATËRIAL STAGING AREA(S).
_CONTRACTOR MAY ADJUST LOCATION AND SIZE ÛF STAGINO AREA WITH APPROVAL
FROM THE LOCAL JURISDICTION.
2. FEATURE MUST BE ÌNSTALLEO PRIOR TO IXCAVATIOT.¡, EARTHWORK OR DELIVERY OF
MÀTERIALS,
J. MATERIALS MUST BE STATIONEO ON THE POLY UNER. ANY INCITENÏAL MATERIALS
DËFOSITED ON PAVED SECTION OR ALONT CURB LINE MUST gE CLIANED UP PROMPTLY
4. POLY LINER AND TARF COVER SHOULD EE OT SrcNIFICANT THICKNESS TO PREVENT
DAMAGE OR LOSS OT INÏEGRITY.
5, SAND BÀGS MAY EE SUESTITUTED TO ANCHOR THE COVER TARP OR PROVIDE BERMING
UNDER THE BASE LINER.
6. FEATURE ts NOT TNTENDED FoR usE wrTH wET MATERTAL THAI wLL 8E DRAINING AND/oR
SPREADING OUT ON THE POLY LINER OR FOR DEMOLITON MATERIALS.
7, THIS FEATURE CAN EE USËD FOR:
-UTILITY REPAIRS,
-WHEN OTHER STAGING LOCATIONS AND OPTIONS ARE LIMITED.
-ÛTHER LIMITEO APPLICAT¡ON ANO SHORT DURATION 5ÏAGIN6,
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 SP-5
MM.2 Stockpile Management (SM)
MATËR¡ALS STÂGING IN ROADWAY MAINTENANCE NOTIS
1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM lN EFFECTIVE OPERAï|NG CONDITICN,
MAINÏÊNAhICE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS
PûSS¡8LE (AND ALWAYS WTTHTN 24 HoURS) FOLLOWNG A STôRM THAÎ CAUSES SURFACË
EROSIÔN, ANÛ PERFORM NECCSSARY MAINTENANCE.
2. FREQUENT ûESERVATIONS ANt MÀINTENANCE ARE NECESSARY 10 MAINTAIN ÊMPs lN
EFFECTIVE OPERATING CONÞITION. INSPECÏIONS ANÛ CORRECÏIVE MEASURES SHOULD BE
DTCUMENÏED THOROUGHLY,
3- WHERE BMPs HAVE FAILED, RËPAIR OR REPLACEMÉNT SHOULD BE INITIATEÞ UPON
DISCOVERY OF ÏHE FAILURE.
4. INSPECT PVC PIPE ALONG CURB LINE FOR CLOGGING AND DEBRIS. REMOVE OBSÏRUCTIONS
PROMPTLY.
5. CLEAN MATERIAL FROM PAVED SURFACES BY SI^'EEPING OR VACUUMING.
NOTE: MANY JURISDICflÕNS HAVE BMP DETÀ|LS THAT VARY FROM UDFCD STAilIDARD DEIAILS
CONSULT WITH LOCAL JURISDICNÔNS AS TO WHICH ÛÊTA¡L SHOULD ÐE USED WHEN
ÐIFFËRÉNCËS ARE NOTEÐ,
(oEI¡¡LS A0APÍEo FRoM AURoRA. COLORAoO)
SP-6 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeeping Practices (GH)MM.3
¡
Description
Implement construction site good housekeeping practices to
prevent pollution associated with solid, liquid and hazardous
construction-related materials and wastes. Stormwater
Management Plans (SWMPs) should clearly specify BMPs
including these good housekeeping practices:
. Provide for waste management.
. Establish proper building material staging areas.
Designate paint and concrete washout areas
Establish proper equipment/vehicle fueling and
maintenance practices.
Control equipment/vehicle washing and allowable non-
stormwater discharges.
Develop a spill prevention and response plan.
Appropriate Uses
Photographs GH-l and GH-2. Proper materials
storage and secondary containment for fueI tanks
are important good housekeeping practices. Photos
courtesy of CDOT and City of Aurora.
Good housekeeping practices are necess¿rry at all construction sites.
Design and Installation
The following principles and actions should be addressed in SWMPs
Provide for Waste Management. Implement management procedures and practices to prevent or
reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the site. Practices such as trash disposal, recycling, proper material handling,
and cleanup measures can reduce the potential for stormwater runoff to pick up construction site
wastes and discharge them to surface waters. Implement a comprehensive set of waste-management
practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides,
wood preservatives, acids, roofing tar, and other materials. Practices should include storage,
handling, inventory, and cleanup procedures, in case ofspills. Specific practices that should be
considered include:
Solid or Construction Waste Good Housekeeping
Functions
Erosion Control No
Sediment Control No
SiteMaterial Manasement Yes
Acknowledgement: This Fact Sheet is based directly on
EPA guidance provided in Developing Your Stormwater
Pollutíon Prevent Plaz (EPA 2007).
o Designate trash and bulk waste-collection areas on-
site.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 GH-1
MM.3 Good Housekeeping Practices (GH)
o Recycle materials whsnever possible (e.g., paper, wood, concrete, oil).
o Segregate and provide proper disposal options for hazardous material wastes.
o Clean up litter and debris from the construction site daily.
o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste-
collection areas (dumpsters, and such) are often best located near construction site entrances to
minimize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges.
o Empty waste containers before they are full and overflowing.
Sanitary and Septic Waste
o Provide convenient, well-maintained, and properly located toilet facilities on-site.
o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintain clean restroom facilities and empty portable toilets regularly.
o Where possible, provide secondary containment pans under portable toilets.
o Provide tie-downs or stake-downs for portable toilets.
o Educate employees, subcontractors, and suppliers on locations offacilities.
Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
Inspect facilities for leaks. If found, repair or replace immediately.
Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are
not spilled on the ground.
Hazardous Materials and Wastes
Develop and implement employee and
subcontractor education, as needed, on
hazardous and toxic waste handling,
storage, disposal, and cleanup.
o Designate hazardous waste-collection
areas on-site.
o Place all hazardous and toxic material
wastes in secondary containment.
Photograph GH-3. Locate portable toilet facilities on level
surfaces away from waterways and storm drains. Photo
courtesy of WWE.
o
o
o
o
GH.2 November 2010Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeep ing Practices (GH)MM.3
¡
o Hazardous waste containers should be inspected to ensure that all containers are labeled properly
and that no leaks are present.
Establish Proper Building Material Handling and Staging Areas. The SWMP should include
comprehensive handling and management procedures for building materials, especially those that are
hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building
materials that have the potential to contaminate stormwater should be stored indoors or under cover
whenever possible or in areas with secondary containment. Secondary containment measures prevent
a spill from spreading across the site and may include dikes, berms, curbing, or other containment
methods. Secondary containment techniques should also ensure the protection of groundwater.
Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and
other potential pollutants. Designated staging areas enable easier monitoring of the use of materials
and cleanup ofspills. Training employees and subcontractors is essential to the success ofthis
pollution prevention principle. Consider the following specific materials handling and staging
practices:
Train employees and subcontractors in proper handling and storage practices.
Clearly designate site areas for staging and storage with signs and on construction drawings.
Staging areas should be located in areas central to the construction site. Segment the staging area
into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits
should be clearly marked so that delivery vehicles enterþxit through stabilized areas with vehicle
tracking controls (See Vehicle Tracking Control Fact Sheet).
Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC)
requirements and plans and provide cover and impermeable perimeter control, as necessary, for
hazardous materials and contaminated soils that must be stored on site.
Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation
failure, or other signs of deterioration and tested for soundness.
o Reuse and recycle construction materials when possible.
Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout
facilities at their own plants or dispatch facilities when feasible; however, concrete washout
commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on-
site, designate specific washout areas and design facilities to handle anticipated washout water.
Washout areas should also be provided for paint and stucco operations. Because washout areas can
be a source of pollutants from leaks or spills, care must be taken with regard to their placement and
proper use. See the Concrete Washout Area Fact Sheet for detailed guidance'
Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint,
and stucco work are occurring on large poftions of the site. Be sure to check for evidence that
contractors are using the washout areas and not dumping materials onto the ground or into drainage
facilities. If the washout areas are not being used regularly, consider posting additional signage,
relocating the facilities to more convenient locations, or providing training to workers and
contractors.
When concrete, paint, or stucco is part of the construction process, consider these practices which will
help prevent contamination of stormwater. Include the locations of these areas and the maintenance
and inspection procedures in the SWMP.
o
o
o
o
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 GH-3
MM-3 Good Housekeeping Practices (GH)
o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained
areas, or streams. Only use designated washout areas.
o Establish washout areas and advertise their locations with signs. Ensure that signage remains in
good repair.
o Provide adequate containment for the amount of wash water that will be used.
o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be
removed.
o Dispose of materials properly. The preferred method is to allow the water to evaporate and to
recycle the hardened concrete. Full service companies may provide dewatering services and
should dispose of wastewater properly. Concrete wash water can be highly polluted. It should
not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system without first receiving written permission from the system operator.
Estabtish Proper EquipmentA/ehicle Fueling and Maintenance Practices. Create a clearly
designated on-site fueling and maintenance aÍea that is clean and dry. The on-site fueling area should
have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and
maintenance activities in a covered area. Consider the following practices to help prevent the
discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the
locations of designated fueling and maintenance areas and inspection and maintenance procedures in
the SWMP.
o Train employees and subcontractors in proper fueling procedures (stay with vehicles during
fueling, proper use of pumps, emergency shutoff valves, etc.).
o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service
problems.
o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses
to prevent stormwater run-on and runoff.
o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids.
o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and
recycle fluids whenever possible.
Control EquipmentA/ehicle Washing and Allowable Non-Stormwater Discharges. Implement
practices to prevent contamination of surface and groundwater from equipment and vehicle wash
water. Representative practices include:
o Educate employees and subcontractors on proper washing procedures.
o Use off-site washing facilities, when available.
o Clearly mark the washing areas and inform workers ttrat all washing must occur in this area.
o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain
separation from drainage paths and waterbodies.
Urban Drainage and Flood Control District
Urban Storrn Drainage Criteria Manual Volume 3
GH-4 November 2010
Good Housekeeping Practices (GH)MM.3
o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can
remove most din adequately.
o Do not conduct other activities, such as vehicle repairs, in the wash area.
o Include the location of the washing facilities and the inspection and maintenance procedures in
the S'WMP.
Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be
identified in the SWMP. Representative procedures include identifying ways to reduce the chance of
spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by
spills, and train personnel responsible for spill prevention and response. The plan should also specify
material handling procedures and storage requirements and ensure that clear and concise spill cleanup
procedures are provided and posted for areas in which spills may potentially occur. When developing
a spill prevention plan, include the following:
o Note the locations ofchemical storage areas, storm drains, tributary drainage areas, surface
waterbodies on or near the site, and measures to stop spills from leaving the site.
o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data
Sheets (MSDSs) for chemical used on site with the SWMP.
Establish an education program for employees and subcontractors on the potential hazards to
humans and the environment from spills and leaks.
Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or
municipal sewage treatment facilities to request assistance. Emergency procedures and contact
numbers should be provided in the SWMP and posted at storage locations.
Describe the procedures, equipment and materials for immediate cleanup of spills and proper
disposal.
Identify personnel responsible for implementing the plan in the event of a spill. Update the spill
prevention plan and clean up materials as changes occur [o the types of chemicals stored and used
at the facility.
o
o
o
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
November 2010 GH-5
MM.3 Good Housekeeping Practices (GH)
Spill Prevention, Control, and Countermeasure (SPCC) Plan
Construction sites may be subject to 40 CFR Pafi 1I2 regulations that require the preparation and
implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks.
The facility is subject to this rule if it is a non-transportation-related facility that:
. Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity
greater than 42,004 gailons.
Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters
of the United States and adjoining shorelines.
Furthermore, if rhe facility is subject to 40 CFR Part ll2, the SWMP should reference the SPCC Plan.
To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm.
Reporting Oil Spills
In the event of an oil spill, contact the National Response Center toll free at l-800-424- 8802 for
assistance, or for more details, visit their website: www.nrc.uscg.mil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designation of personnel
responsible for supervising and implementing good housekeeping programs, such as site cleanup and
disposal of trash and debris, hazardous material management and disposal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in good housekeeping efforts.
Staging and storage areas require permanent stabilization when the areas are no longer being used for
construction-related activities.
Consffuction-related materials, debris and waste must be removed from the consû:uction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Details:
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracking Control
Design details are not necessary for other good housekeeping practices; however, be sure to designate
where specific practices will occur on the appropriate construction drawings.
Urban Drainage and Flood Control District
Urban Storm Drainage Criteria Manual Volume 3
GH-6 November 2010
)
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan {SWMp)
TAB 1I
APPENDIX B: PERMITS, APPLICATIONS, FORMS
Summit Services Group, LLC Denver, CO
www.summitserv¡cesgrou þ.com
1-800-540-7967
re#i COLORADO
Depanment of R¡blic
Health & Environment
Facility Activity :
Disturbed Acres:
Facitity Located at:
CERTIFICATION TO DISCHARGE
UNDER
CDPS GENERAL PERAAIT COR4OOOOO
STORMWATER ASSOCIATED WITH CONSTRUCTION ACTIVITIES
Certification Number: COR408974
This Certification to Discharge specificatly authorizes:
Owner Gould Construction
Operator Gould Construction
to discharge stormwater from the facitity identified as
West Glenwood Property
To the waters of the State of Colorado, including, but not limited to:
Colorado River
ResidentiaI Devetopment
3 acres
498932 Hwy 6 & 24 Glenwood Springs CO 81601
GARFIELD County
Latitude 39. 5ó0838 Longitude -107 .349724
Specific lnformation
(if applicable):
Certification is issued and effective : 5 / 4 / 2020
Expiration date of general permit: 3/31/2024
This certification under the permit requires that specific actions be performed at designated times. The certification
hotder is tegatty obtigated to compty with att terms and conditions of the permit.
This certification was approved by:
Meg Parish, Section Manager
Permits Section
Water Quatity Contro[ Division
4300 Cherry Creek Drive South, Denver, CO 80246 303-ó92-3500 www.colorado.gov/cdphelwqcd
re@i COLORADO
Department of hrblic
Health & Environment
Docllcatcd to protoc'tlng rnd lmproving the health and cnvlronmGnt of the pêople of Colorado
Evan Goutd, Risk Manager
Gould Construction
P.O. Box 130
Glenwood Springs, CO 81602
Evan Goutd, Risk Manager
Gould Construction
P.O. Box 130
Glenwood Springs, CO 81602
DATE: 2020-05-04
MEMO RE: Certification, Colorado Discharge Permit System
Permit No., COR400000, Certification Number2 coR4ø8974
DIVIS|ON CONTACTS: Joseph Sturgeon, 303-691-4019, Joseph.Sturgeon@state.co.us
ATTACHMENTS: Certification COR408974, COR400000 General Permit
The Water Quatity Control Division (the Division) has reviewed the apptication submitted for the West Glenwood Property
facitity and determined that it quatifies for coverage under the CDPS General Permit for Stormwater Discharges Associated
with Construction Activities (the permit). Encl,osed please find a copy of the permit certification, which was issued under the
Colorado Water Quality Control Act.
FEE INFORMATION: 3 ACrES
An application fee of 5175 (50% of the annuat fee) witt be assessed for all new apptications. Beginning July 1, 2019 an
annuát fee of 5350 category 7, subcat - Stormwater Construction 1-30 acres disturbed per CRS 25-8'502] witt be assessed
and invoiced every July for as long as the permit certification is in effect.
It is the responsibitity of the permittee to submit a termination application when the permit is no longer needed. Fees
are assessed and invoiced for every permit that is active July 1 of the fiscal year. Permits for which termination applications
are received by June 30 of the current fiscal year wi[[ not be invoiced for the new fiscal year.
CERTI FICATION RECORDS INFORÀ{ATION :
The fottowing information is what the Division records show for this certification.
For any changes to Contacts - Owner, Operator, Facility, or Bitting - a "Notice of Change of Contacts form" must be
managed through the Division's new ptatform catled the Colorado Environmentat Online Services (CEOS). The
Notice of Change of Contacts form must be etectronicalty signed by both the owner and the operator.
Facility: West Glenwood Property GARFIELD County
Construction Activities Residential Development
Owner (receives all legal documentation pertaining to the permit certification):
Evan Goutd, Risk Manager Phone number:970-379-4602
Goutd Construction Emait: evan@goutdconstruction.com
P.O. Box 130
Glenwood Springs, CO 81602
Operator (receives all legal documentation pertaining to the permit certiÍication):
Evan Goutd, Risk Manager Phone number:970'379-4602
Goutd Construction Email: evan@goutdconstruction.com
P.O. Box 130
Glenwood Springs, CO 81602
Facility Contact (contacted for general inquiries regarding the facility):
Evan Gould, Risk Manager Phone number:970-379-4602
Goul,d Construction Emait: evan@goutdconstruction.com
P.O. Box 130
Glenwood Springs, CO 81602
4300 Cherry Creek Drive South, Denver, C0 80246 303-692-3500 www.colorado.gov/cdphe/wqcd
Billing Contact (receives the invoíce pertaining to the permit certification):
Shanda Hunter, Accounts PaYabte
Gould Construction
P.O. Box 130
Glenwood Springs, CO 81602
Phone number: 970-945-7291
Emai[: shanda@gouldconstruction.com
,ST{|E OF CCLOTüDO
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Water Quality Contrcl Division
CDPS GENERAL PERMIT STORAAWATER DISCHARGES ASSOCIATED WTH
CONSTRUCTION ACTIVITY AUTHORIZATION TO DISCHARGE UNDER THE COLORADO DISCHARGE PERl,tlT SYSTE
^
(CDPS)
coR400000
ln comptiance with the provisions of the Cotorado Water Quality Control Act, (25-8-101 et seq., CRS, 1973 as amended)
and the Federat Water Po[[ution Control Act, as amended (33 U.S.C. 1251 et seq.; the'Act"), this permit authorizes the
discharge of stormwater associated with construction activities (and specific atlowabte non-stormwater discharges in
accordance with Part l.A.l. of the permit) certified under this permit, from those tocations specified throughout the State
of Colorado to specified waters of theState.
Such discharges shalt be in accordance with the conditions of this permit. This permit specificatty authorizes the facil,ity
tisted on the certification to discharge in accordance with permit requirements and conditions set forth in Parts I and ll
hereof. At[ discharges authorized herein shatt be consistent with the terms and conditÍons of this permit.
This permit becomes effective on Aprit 1 , 2019, and shat[ expire at midnight March 31 , 2024.
lssued and signed this 30th day of December, 2020.
'W¿4- Pârràr¿(/
lrteg Parish, Permits Section filanager Water Quatity Control Division
COLORADO DEPARTTviENT OF PUBLIC HEALTH AND ENVIRONi,1ENT
Permit Historv
Itodification lssued December 31,2O2O Effective February 1,2021
Originally signed and issued October 31 , 2O18; effective April 1, 2019.
Page 2 of 32
Permit No. COR400000
Table of Contents
PART I
A. COVERAGE UNDER THIS PERA4IT
1. AuthorizedDischarges.
2. Limitations on Coverage
3. Permit Certification and Submittal Procedures
B. EFFLUENT LIMITATIONS
1. Requirements for Control Measures Used to Meet Effluent Limitations..............
2. Discharges to an lmpaired Waterbody ...,,......,........1'l
3. General Requirements 12
c. SToRMWATER i ANAGEMENT PLAN (SWMP) REQUIREMENTS 12
SWMP General Requirements 12
3
3
3
3
4
I
I
1.
2.
3.
4.
D. SrrE TNSPECTTONS .....16
SWMP Review and Revisions.......... ..... 15
5. lnspectionScope.......
SWMP Avaitabitity 16
1. Person Responsibte for Conducting lnspections 16
2. Inspection Frequency... .,...16
3. lnspection Frequency for Discharges to Outstanding Waters ...,,..17
4. Reduced lnspection Frequency
E. DEFINITIONS
F. MONITORING
G. OIL AND GAS CONSTRUCTION
PART ll: STANDARD PERMIT CONDITIONS
A. DUTY TO COMPLY
B. DUTYTO REAPPLY
C. NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE
D. DUTY TO MITIGATE
E. PROPER OPERATION AND ftIAINTENANCE
F. PERMIT ACTIONS.....
G. PROPERTY RIGHTS
H. DUTY TO PROVIDE INFOR¡¡ATION
I. INSPECTION AND ENTRY
17
17
19
22
22
24
24
24
24
24
24
24
24
25
25
25
26
26
26
J. MONITORING AND RECORDS
K. SIGNATORY REQUIREMENTS
1, Authorization to Sign
2. EtectronicSignatures..
Page 2 of 32
Permit No. COR400000
3. Change in Authorization to Sign..........
L. REPORTING REqUIREMENTS
Conditions Necessary for Demonstration of an Upset
1.
2.
3.
4.
5.
6.
7.
L
Anticipated Non -Comptiance.
Transfer of Ownership or Control
Monitoring reports
Comptiance Schedutes
Twenty-four Hour Reporting
Ptanned Changes
Prohibition of Bypass
Effect of an upset.
26
27
27
27
27
27
27
28
28
28
28
28
28
28
29
29
29
29
29
29
29
30
30
30
30
30
30
30
30
30
31
Other Non-Compliance..
Other lnformation.........
M. BYPASS..
1
2
3
Bypass Not Exceeding Limitations..........,...
Notice of Bypass.
1
2
3 Burden of Proof
O. RETENTION OF RECORDS
1. Post-Expiration orTerminâtion Retention...
2. On-site Retention
P. REOPENER CLAUSE
1. Procedures for Modification or Revocation.
2. Water Quatity Protection
Q. SEVERAB|LITY..........
R. NOTTFTCATTON REQUrREMENTS.........
1. Notification to Parties
s. RESPONSTBTLIÏES.....
1. Reduction, Loss, or Failure of Treatment Facitity
T. OIL AND HAZARDOUS SUBSTANCE LIABILITY.............
W. FEES
X. DURATION OF PERM¡T ...............31
y. sEcïoN 307 Toxrcs. ...............31
Page 3 of 32
Permir No. COR400000
Part I
Note: At the first mention of terminology that has a specific connotation for the purposes of this permit, the terminology
is electronicatty tinked to the definitions section of the permit in Part l.E.
A. COVERAGE UNDER THIS PERIAIT
1. AuthorizedDischarges
This general permit authorizes permittee(s) to discharge the fottowing to state waters: stormwater
associated with construction activity and specified non-stormwater associated with construction
activity. The fottowing types of stormwater and non-stormwater discharges are authorized under this
permit:
a. AtlowableStormwaterDischarges
i. Stormwater discharges associated with construction activity.
ii. Stormwater discharges associated with producing earthen materials, such as soils, sand, and
gravel dedicated to providing material to a single contiguous site, or within /¡ mite of a
construction site (e,9. borrow or fitl areas).
iii. Stormwater discharges associated with dedicated asphatt, concrete batch plants and masonry
mixing stations (Coverage under this permit is not required if attemative coverage has been
obtained.)
b. Al,towabte Non-Stormwater Díscharges
The fotlowing non-stormwater discharges are allowabte under this permit if the discharges are
identified in the stormwater management ptan in accordance with Part l.C and if they have
appropriate control measures in accordance with Part l.B.f .
i. Discharges from uncontaminated springs that do not originate from an area of land
disturbance.
?
ii. Discharges to the ground of concrete washout water associated with the washing of concrete
tools and concrete mixer chutes. Discharges of concrete washout water must not leave the site
as surface runoff or reach receiving waters as defined by this permit. Concrete on-site waste
disposal is not authorized by this permit except in accordance with Part l.B.l.a.ii(b).
iii. Discharges of landscape irrigation return flow.
iv. Discharges from diversions of state waters within the permitted site.
c. Emergency Fire Fighting
Discharges resulting from emergency firefighting activities during the active emergency response
are authorized by this permit.
Limitations on Coverage
Discharges not authorized by this permit include, but are not limited to, the discharges and activities
tisted below. Permittees may seek individual or altemate general permit coverage for the discharges, as
appropriate and avai labte.
a. Discharges of Non-Stormwater
Discharges of non-stormwater, except the authorized non-stormwater discharges listed in Part
Page 4 of 32
Permit No. COR400000
1.4.1.b., are not etigibte for coverage under this permit.
b. Discharges Currentty Covered by another lndividuat or General Permit
c.Discharges Currentty Covered by a Water Quatity Control Division (division) Low Risk Guidance
Document
3. Permit Certification and Submitta[ Procedures
a. Duty to Appty
The following activities shatt appty for coverage under this permit:
Í. Construction activity that witt disturb one acre or more; or
ii. Construction activity that is part of a common ptan of development or sale; or
iii. Stormwater discharges that are desígnated by the division as needing a stormwater permit
because the discharge:
(aJ contributes to a violation of a water quatity standard; or
tþ) ls a significant contributor of poltutants to state waters.
b. ApplicationRequirements
To obtain authorization to discharge under this permit, applicants apptyrng for covenge fottowing
the effective date of the renewal permit shatl meet the foltowing requirements:
i. Owners and operators submitting an application for permit coverage witt be co- permittees
subject to the same benefits, duties, and obtigations under this permit.
ii. Signature requirements: Both the owner and operator (permittee) of the construction site, as
defined in Part 1.E., must agree to the terms and conditions of the permit and submit a
compteted apptication that inctudes the signature of both the owner and the operator. ln cases
where the duties of the owner and operator are managed by the owner, both apptication
signatures may be completed by the owner. Both the owÌìer and operator are responsibte for
ensuring compliance with atl terms and conditions of the permit, inctuding implementation of
the stormwater management plan.
iii. The appticant(s) must develop a stormwater management plan (SWMP) in accordance with the
requirements of Part l.C. The appticant(s) must atso certify that the SWMP is complete, or witt
be complete, prior to commencement of any construction activity.
iv. ln order to appty for certification under this general permit, the applicant(s) must submit a
comptete, accurate, and signed permit apptication form as provided by the division by
electronic delivery at least 10 days prior to the commencement of construction activity,
except those construction activities thatare in response to a public emergency retated site;
pubtic emergency retated sites shall appty for coverage no later than 14 days after the
commencement of construction activities. The provisions of this part in no way remove a
violation of the Colorado Water Quatity Control Act if a point source discharge occurs prior to
the issuance of a CDPS permit.
v. The application in its entirety must be submitted via the division's online permitting system
unless a waiver is granted by the division. lf a waiver is granted, the apptication in its entirety,
including signatures by both the owner and operator, must be submitted to:
c
Page 5 of 32
Permit No. COR400000
Colorado Department of Pubtic Heatth and Environment
Water Quality Control Division
Permits Section, WQCD-PS-B2
4300 Cherry Creek Drive South
Denver, CO 89246
vi. The applicant(s) must receive written notification that the division granted permit coverage
prior to conducting construction activities except for construction activities that are in
response to a public emergency related síte.
Division Review of Permit Application
Within 10 days of receipt of the application, and fotlowing review of the apptication, the division
may:
i. lssr.¡e a certification of coverage;
ii. Request additionat information necessary to evatuate the discharge;
iii. Detay the authorization to discharge pending further review;
iv. Notify the applicant that additiona[ terms and conditions are necessary; or
v. Deny the authorization to discharge under this generat permit.
Altemative Permit Coverage
i. Division Required Alternative PermitCoverage:
The division may require an appticant or permittee to appty for an individuat permit or an
alternative general permit if it determines the discharge does not falt under the scope of this
general permit, including if any additional terms and conditions are necessary in order to ensure
that discharges authorized by this permit shatl not cause, have the reasonabte potential to cause,
or measurably contribute to an exceedance of any appticabte water quatity standard, inctuding
narrative standards for water quatity. ln this case, the division witt notify the appticant or
permittee that an individuat permit apptication is required.
ii. Permittee Request for Alternative Permit Coverage:
A permittee authorized to dÍscharge stormwater under this permit may request to be exctuded from
coverage under this general permit by apptying for an individual permit. ln this case, the permittee
must submit an individuat apptication, with reasons supporting the request, to the division at least
180 days prior to any discharge. When an individuat permit is issued, the permittee's authorization
to discharge under this permit is terminated on the effective date of the individual permit.
e. SubmittatSignatureRequirements
Documents required for submittat to the division in accordance with this permit, including
applications for permit coverage and other documents as requested by the division, must include
signatures by both the owner and the operator, except for instances where the duties of the owner
and operator are managed by the owner.
Signatures on a[[ documents submitted to the division as required by this permit must meet the
Standard Signatory Requirements in Part ll.K of this permit in accordance with 40 C.F.R. 122.41(k).
i. SignatureCertification
Any person(s) signing documents required for submittal to the division must make the following
d
r
Page 6 of 32
Permit No. COR400000
certification:
"l certify under penalty of law that this document and a[[ attachments were prepared under my
direction or supervision in accordance with a system designed to assure that quatified personnel
property gather and evaluate the information submitted. Based on my inquiry of the person or
peßons who manage the system, or those persons directly responsibte for gathering the
information, the information submitted is, to the best of my knowtedge and betief, true, accurate,
and comptete. I am aware that there are significant penatties for submitting false information,
inctuding the possibility of fine and imprisonment for knowing violations."
Compliance Document Signature Requirements
Documents which are required for compliance with the permit, but for which submittal to the
division is not required unless specificatty requested by the division, must be signed by the
individuat(s) designated as the Qualified Stormwater fttanaqer. as defined in Part l.E.
i. Any person(s) signing inspection documents required for compliance with the permit per Part
l,D.S.c.xiii must make the fotlowing statement and provide the date of the statement:
"l verify that, to the best of my knowledge and betief, that if any corrective action items were
identified during the inspection, those corrective actions are comptete, and the site is currentty in
compliance with the permit."
Fietd Mde Permit Coverage for Oit and Gas Construction
At the discretion of the division, a singte permit certification may be issued to a single oil and gas
permittee to cover construction activity retated discharges from an oil and gas fietd at muttiple
locations that are not necessarily contiguous.
g.
h. Permit Coverage without Apptication
Qual,ifying Locat Program: When a small construction site is within the jurisdiction of a quatifying
locat program, the owner and operator of the construction activity are authorized to discharge
stormwater associated with smatt construction activity under this general permit without the
submittal of an apptication to the division. Sites covered by a qualifying local program are exempt
from the fottowing sections of this general permit: Part 1.4.3.a.; Part LA.3.b.; Part 1.4.3.c.; Part
1.4.3.d.; Part 1.4.3.g.; Part 1.4.3.i.; Part 1.4.3.j.; Part 1.4.3.k.
Sites covered by a quatifying [oca[ program are subject to the fottowing requirements:
i. Locat Agenry Authority: This permit does not pre-empt or supersede the authority of locat
agencies to prohibit, restrict, or control discharges of stormwater to storm drain systems or
other water courses within their iurisdiction.
ii. Permit Coverage Termination: When a site under a Quatifying Local Program is finatty
stabitized, coverage under this permit is automatically terminated'
iii. Comptiance with Quatifying Local Program: Quatifying Local Program requirements that are
equivalent to the requirements of this permit are incorporated by reference. Permittees
authorized to discharge under this permit, must comply with the equivalent requirements of
the Quatifying Local Program that has jurisdiction over the site as a condition of this permit.
iv. Compliance with Remaining Permit Conditions. Requirements of this permit that are in
addition to or more stringent than the requirements of the Quatifying Local Program appty in
addition to the requirements of the Quatifying Local Program.
v. Written Authorization of Coverage: The division or locat municipality may require any
permittee within the jurisdiction of a Quatifying Local Program covered under this permit to
PageT of 32
Permit No. COR400000
apply for, and obtain written authorization of coverage under this permit. The permittee must
be notified in writing that an apptication for written authorization of coverage is required.
Permittee lnitiated Permit Actions
Permittee initiated permit actions, including but not timited to modifications, contact changes,
transfers, and terminations, shalt be conducted fottowing Part ll.L, division guidance and using
appropriate division -provided forms.
j. Sate of Residence to Homeowner
Residential construction sites only: The permittee may remove residentiat lots from permit
coverage once the lot meets the following criteria:
i. The residential lot has been sotd to the homeowner(s) for private residential use;
ii. A certificate of occupancy, or equivatent, is maintained on-site and is available during division
inspections;
iii. The tot is less than one acre of disturbance;
iv. At[ construction activity conducted on the tot by the permittee is complete;
v. The permittee is not responsible for final stabilization of the [ot; and
vi. The SWMP was modified to indicate the lot is no longer part of theconstruction activity.
lf the residential lot meets the criteria listed above then activities occurring on the lot are no
longer considered to be construction activities with a duty to appty and maintain permit coverage.
Therefore, the permittee is not required to meet the final stabitization requirements and may
terminate permit coverage for the tot.
k. Permit Expiration and Continuation of Permit Coverage
Authorization to discharge under this general permit shatl expire at midnight on À{arch 31,2024.
White Regutation ó1.4 requires a permittee to submit an application for continuing permit coverage
180 days before the permit expires, the division is requiring that permittees desiring continued
coverage under this general permit must reapply at least 90 days in advance of this permit
expiration. The division witt determine if the permittee may continue to discharge stormwater
under the terms of the general permit. An indiúdual permit may be required for any facitity not
reauthorized to discharge under the reissued general permit.
lf this permit is not reissued or reptaced prior to the expiration date, it witt be administratively
continued and remain in force and effect. For permittees that have apptied for continued permit
coverage, discharges authorized under this permit prior to the expiration date witl automatically
remain covered by this permit until the eartiest of:
An authorization to discharge under a reissued permit, or a replacement of this permit,
fottowing the timely and appropriate submittâ[ of a completeapptication requesting
authorization to discharge under the new permit and compliance with the requirements of the
new permit; or
ii. The issuance and effect of a termination issued by the division; or
iii. The issuance or denial of an individual permit for the facility's discharges; or
iv. A format permit decision by the division not to reissue this general permit, at which time the
division witt identify a reasonabte time period for covered dischargers to seek covenge under
Page 8 of 32
Permit No. COR400000
an attemative general permit or an individual permit. Coverage under this permit wit[ cease
when coverage under another permit is granted/authorized; or
The division has informed the permittee that discharges previously authorized under this
permit are no longer covered under this permit.
B. EFFLUENT LIMITATIONS
1" Requirements for Control Measures Used to Meet Effluent Limitations
The permittee must imptement control measures to minimize the discharge of poltutants from att
potential pollutant sources at the site. Control measures must be instalted prior to commencement of
construction activities. Control measures must be selected, designed, instalted and maintained in
accordance with good enqineering. hvdroloEic and ootlution control oractices. Control measures
imptemented at the site must be designed to prevent potlution or degradation of state waters.
a. StormwaterPoltutionPrevention
The permittee must imptement structural and/or nonstructural control measures that effectivety
minimize erosion, sediment transport, and the release of other pollutants related to construction
activity.
i. ControlMeasures for Erosion and Sediment Control
Control measures for erosion and sediment control may inctude, but are not limited to,
watttes/sediment control [ogs, sitt fences, earthen dikes, drainage swales, sediment traps,
subsurface drains, pipe slope drains, intet protection, outtet protection, gabions, sediment basins,
ternporary vegetation, pennanent vegetation, mutching, geotextites, sod stabitization, stope
roughening, maintaining existing vegetation, protection of trees, and preservation of mature
vegetation.
Specific controt measures must meet the requirements listed betow.
[ä) Structural and nonstructural vehicle tracking controls shatt be implemented to
minimize vehicle tracking of sediment from disturbed areas and may inctude tracking
pads, minimÍzing site access, wash rack, graveled parking areas, maintaining vehicle
traffic to paved areas, street sweeping and sediment control measures.
[þl Stormwater runoff from atl disturbed areas and soi[ storage areas must utilize or flow
to one or more control measures to minimize erosion or sediment in the discharge. The
control measure(s) must be setected, designed, instatted and adequately sized in
accordance with good engineering, hydrotogíc and poltution control practices for the
intended apptication. The control measure(s) must contain or fitter ftows in order to
prevent the bvDass of flows without treatment and must be appropriate for
stormwater runoff from disturbed areas and for the expected flow rate, duration, and
flow conditions (e.g. sheet or concentrated ftow).
[c] Selection of control measures should prioritize the use of structura[ and nonstructural
controt measures that minimize the potential for erosion (i.e. covering materiats).
Selection shoutd atso prioritize phasing construction activities to minimize the amount
of soil disturbance at any point in time throughout the duration of construction.
td) Outtets that withdraw water from or near the surface shalt be instaltedwhen
discharging from basins and impoundments, unless infeasibte.
[e) Maintain pre-existing vegetation or equivatent control measures for areas within 50
horizonta[ feet of receiving waters as defined by this permit, unless infeasibte.
v
Page 9 of 32
Permit No. COR400000
(f) Soit compaction must be minimized for areas where infiltration control measures witl
occur or where finat stabitization wilt be achieved through vegetative cover.
tg) Untess infeasibte, topsoil shatt be preserved for those areas of a site thatwitt utitize
vegetative final stabitization.
{h) Minimize the amount of soil exposed during construction activity, including the
disturbance of steep slopes.
(i) Diversion controt measures must minimize soit transport and erosion within the entire
diversion, minimize erosion during discharge, and minimize run-on into the diversion.
The permittee must minimize the discharge of potlutants throughout the instatlation,
imptementation and removal of the díversion. Diversions must meet one or more of the
fottowing conditions:
(1) Lined or piped structures that result in no erosion in at[ flow conditions.
(2) Diversion channels, berms, and coffer dams must be tined or composed of a
material that minimizes potential for soil loss in the entire wetted perimeter
during anticipated flow conditions (e.g. vegetated swale, non-erosive soil
substrate). The entire tength of the divenion channet must be designed with att of
the foltowing considerations: maximum flow velocity for the type of materiat(s)
exposed to the anticipated ftows to ensure that the calcutated maximum shear
stress of flows in the channel is not expected to result in physical damage to the
channel or liner and result in discharge of pottutants. Additionatly, the conditions
retied on to minimize soil loss must be maintained for the projected tife of the
diversion (i.e. a vegetated swale must be timited to a period of time that ensures
vegetative growth, minimizes erosion and maintains stabte conditions).
(3) An alternative diversion criteria, approved by the division prior to
imptementation. The diversion method must be designed to minimize the
discharge of poltutants and to prevent the potential for potlution or degradation
to ståte waters as a result of the diverted flow through the diversion structure. ln
addition, the attemative diveruion method must minimize the discharge of
pottutants throughout the instatlation, imptementation and remol¡at of the
diversion.
ii. Practices for Other Common Poltutants
¡a) Butk storage, individual containers of 55 gattons or greater, for petroteum products and
other Liquid chemicals must have secondary contâinment, or equivalent protection, in
order to contain spitls and to prevent spitted material from entering statewaters.
[þl controt measures designed for concrete washout waste must be implemented. This
includes washout waste discharged to the ground as authorized under this permit and
washout waste from concrete truck and masonry operations contained on site. The
permittee must ensure the washing activities do not contribute potlutants to
stormwater runoff, or receiving waters in accordance Part l.A.1.b.ii. Discharges that
may reach groundwater must flow through soil that has buffering capacity prior to
reaching groundwater, as necessary to meet the efftuent limits in this permit,
inctuding Part 1.8.3.a. The concrete washout location must not be located in an area
where shatlow groundwater may be present and would result in buffering capacity not
being adequate, such as near natural drainages, springs, or wettands, This permit
authorizes discharges to the ground of concrete washout waste, but does not authorize
on-site waste disposal per Part LB.3.d.
te ) ln the event that water remains onsite and contains potlutants either from the
Page 10 of 32
Permit No. COR400000
firefighting activities or picked up from the site (i.e. in a gutter, sediment basin, etc.)
after active emergency response is comptete, the permittee must ensure the
remaining wâter containing poltutants is properly removed and disposed of in order to
minimize po[utants from discharging from the site, unless infeasible.
iii. Stabitization Requirements
The fol.towing requirements must be imptemented for each site.
(a) Temporary stabitization must be imptemented for earth disturbing activities on any portion
of the site where ground disturbing construction activity has permanently ceased, or
temporarity ceased for more than 14 calendar days. Temporary stabilization methods may
include, but are not timited to, tårps, soil tackifier, and hydroseed. The permittee may
exceed the 14-day schedule when either the function of the specific area of the site
requires it to remain disturbed or physical characteristics of the terrain and ctimate
prevent stabilization. The SWMP must document the constraints necessitating the
atternative schedute, provide the atternate stabitization schedule, andidentify att locations
where the attemative schedute is appticable on the site map. Minimum ínspection
frequency and scope, as directed in Part 1.D., must be followed for temporarily stabilized
areas,
(b) Finat stabilization must be implemented for all construction sites covered under this
permit. Final stabitization is reached when (1), (2), and (3) betow are complete:
(1) Att construction activities are complete.
(2) Permanent stabilization methods are complete. Permanent stabitization methods
include, but are not [imited to, permanent pavement or concrete, hardscape,
xeriscape, stabitized driving surfaces, vegetative cover, or equivalent permãnent
atternative stabilization methods. The division may approve attemative final
stabitization criteria for specific operations. Vegetative cover must meet the
following criteria:
a. Eventy distributed perennial vegetation, and
b. Coverage, at a minimum, equal to 70 percent of what would have been
provided by native vegetation in a local, undisturbed area or adequate
reference site, and
(4) The permittee must ensure atl temporary control measures are removed from the
construction site once final stabilization is achieved, except when the controt
measure specifications altow the controt measure to be teft in place (i.e. bio-
degradabte control measures).
[dl Finat stabilization must be designed and instatled as a permanent feature. Final
stabitization measures for obtaining a vegetâtive cover or attemative stabitization
methods include, but are not limited to, the foltowing as appropriate:
(1) Seed mix selection and apptication methods;
(2) Soit preparation and amendments;
(3) Soit stabilization methods to provide adequate protection to minimize erosion
(e.g. crimped straw, hydro mulch or rotled erosion control products);
(4) Appropriate sediment control measures as needed untit final stabilization is
achieved;
?
Page 11 of 32
Permit No. COR400000
(5) Permanent pavement, hardscape, xeriscape, stabitized driving surfaces;
tÊ) Other attemative stabitization practices as appticabte.
b. Maintenance
The permittee must ensure that att controt measures remain in effective operating condition and
are protected from activities that woutd reduce their effectiveness. Control measures must be
maintained in accordance with good engineering, hydrotogic and pollution control practices.
Observations leading to the required maintenance of control measures can be made during a site
inspection, or during general observations of site conditions. The necessary repairs or modifications
to a control measure requiring routine maintenance, as defined in Part 1.E., must be conducted to
maintain an effective operating condition. This section is not subject to the requirements in Part
LB.l.c betow.
c. Corrective Actions
The permittee must assess the adequary of control measures at the site, and the need for changes
to those control measures, to ensure continued effective performance.
When an inadequate control measure, as defined in Part 1.E., is identified (i.e., new or
reptacement control measures become necesary), the fottowing corrective action requirements
appty. The permittee is in noncomptiance with the permit untit the inadequate control measure is
replaced or corrected and retumed to effective operating condition in compliance with Part 1.8.1
and the general requirements in Part 1.8.3. lf the inadequate control measure resutts in
noncomptiance that meets the conditions of Part ll.L., the permittee must atso meet the
requirements of that section.
i. The permittee must take al[ necessary steps to minimize or prevent the discharge of pollutants
from the permitted area and manage any stormwater run-on onto the site until a controt
measure is imptemented and made operational and/or an inadequate controt measure is
reptaced or corrected and retumed to effective operating condition. lf it is infeasibte to instatl
or repair the control measure immediatety after discovering the deficiency, the fottowing must
be documented in the SWMP in Part l.D.5.c and kept on record in accordance with the
recordkeeping requirements in Part ll.
(a) Describe why it is infeasible to initiate the instatl,ation or repair immediately; and
(b) Provide a schedule for instatling or repairing the control measure and returning it to an
effective operating condition as soon as possible.
ii. lf appticabte, the permittee must remove and property dispose of anyunauthorized retease or
discharge within and from the permitted area (e,g., discharge of non-stormwater, untreated
stormwater containing poltutants, spi[[, or leak not authorized by this permit.) The permittee
must also ctean up any contaminated surfaces, if feasible, to minimize discharges of the
material in subsequent storm events, inctuding water remaining from the response that
contains pollutants after active emergency firefighting response is complete.
Discharges to an lmpaired Waterbody
a. Totat Maximum Daitv Load (TMDL)
lf the discharge from the site of permit coverage flows to or coutd reasonabty be expected to flow
to any water body for which a TMDL has been approved, and stormwater discharges associated with
construction activity were assigned a potlutant-specific Wastetoad Allocation (WLA) under the
TMDL, the division may:
i. Ensure the WLA is implemented property through altemative [oca[ requirements, such as by a
Page 12of 32
Permit No. COR400000
municipal stormwater permit; or
ii. Notify the permittee of the Wl-A and amend the permittee's certification to add specific
effluent limits and other requirements, as appropriate. The permitteemay be required to do
the fottowing:
(a] Under the permittee's SWMP, implement specific control measures based on
requirements of the WLA, and evaluate whether the requirements are met through
implementation of existing stormwater controt measures or if additíonal control
measures are necessary. Document the catcutations or other evidence demonstrating
that the requirements are expected to be met; and
tÞ) lf the evatuation shows that additional or modified control measures are necessary,
describe the type and schedule for the control measure additionsor modifícations.
iii. Discharge monitoring may also be required. The permittee may maintain coverage under the
generat permit provided they cornpty with the appticabte requirements outtined above. The
division reserves the right to require individuat or attemate genera[ permit coverage.
3. GeneralRequirements
a. Discharges authorized by this permit shalt not cause, have the reasonable potential to cause, or
measurably contribute to an exceedance of any applicable water quatity standard, inctuding
narrative standards for water quatity.
b. The division may require sampting and testing, on a case-by-case basis, in the event that there is
reason to suspect that the SWMP is not adequatety minimizing pottutants in stormwater or in order
to measure the effectiveness of the control measures in removing pollutants in the effluent. Such
monitoring may inctude Whole Effluent Toxicity testing.
c. The permittee must comply with the tawfut requirements of federa[ agencies, municipatities,
counties, dninage districts and other local agencies inctuding appticabte requirements in Àlunicipal
Stormwater Àlanagement Programs developed to comply with CDPS permits. The permittee must
comply with tocat stormwater management requirements, policíes and guidelines inctuding those
for erosion and sediment controt.
d. Al[ construction site wastes must be property managed to prevent potential pottution of state
waters. This permit does not authorize on-site waste disposat.
e. This permit does not relieve the permíttee of the reporting requirements in 40 CFR fi0, 40 CFR 117
or 40 CFR 302. Any discharge of hazardous material must be handted in accordance with the
division's Noncompliance Notification Requirements (see Part ll.L of the permit).
C. STOR¡\ WATER^,IANAGEMENT PláN (SWMP) REQUIREMENTS
1. SWMP Generat Requirements
a. A SWMP shatt be devetoped for each construction site tisted under Part 1.4.3.a, including but not
limited to, construction activity that witl disturb one acre or more and/or are part of a common
plan of development or sate covered by this permit. The SWMP must be prepared in accordance
with good en$neering, hydrologic and pollution control practices.
i. For pubtic emergency related sites, a SWMP shatt be created no tater than 14 da¡a after the
commencement of construction activities.
b. The permittee must implement the provisions of the SWMP as written and updated, from
commencement of construction activity until final stabitization is complete. The division may
review the sw¡\tP.
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Permit No. COR400000
c. A copy of the SWMP must be retained onsite or be onsite when construction activities are occurríng
at the site untess the permittee specifies another location and obtains approval from the division.
I. SWMP Content
a. The SWMP, at a minimum, must inctude the fottowing etements.
i. Qualified Stormwater ly{anaser. The SWMP must list individuat(s) by titte and name who are
designated as responsible for implementing the SWMP in its entirety and meet the definition of
a Quatified Stormwater Manaqer. This role may be fitted by more than one individuat.
ii. Spilt Prevention and Response Ptan. The SWMP must have a spitt prer/ention and response plan.
The ptan may incorporate by reference any part of a Spitt Prerr¡ention Control and
Countermeasure (SPCC) plan under section 311 of theClean Water Act (CWA) or a Spitt
Prevention Plan required by a separate CDPS permit. The relevant sections of any referenced
ptans must be avaitable as part of the SWMP consistent with Part 1.C.4.
iii. Other CDPS Permits. The SWMP must list the appticabte CDPS permits associated with the
permítted site and the activities occurring on the permitted site (e.9. a CDPS Dewatering
Permit).
iv. Materials Handtinq. The SWMP must describe handling procedures of att control measures
imptemented at the site to minimize impacts from handling significant materials that could
contribute pottutants to runoff. These handling procedures can inctude control measures for
pottutants and activities such âs, exposed storage of buitding materials, paints and solvents,
landscape materiats, fertitizers or chemicats, sanitary waste material, trash and equipment
maintenance or f ueling procedures.
V Potential Sources of Pottution, The SWMP must list a[l potentiat sources of poltution which may
reasonabty be expected to affect the quatity of stormwater discharges associated with
construction activity from the site. This may include, but is not limited to, the fottowing
potlutant sources:
tal Disturbed and stored soits;
[þ] Vehicte tracking of sediments;
(c) ¡l,tanagement of contaminated soils, if known to be present, or if contaminated soils
are found during construction;
td) Loading and untoading operations;
tÉJ Outdoor storage activities (erodibte buitding materials, fertitizers, chemicats, etc.);
1fl Vehicte and equipment maintenance and fueling;
(g) Significant dust or particulate generating processes (e.g., saw cutting material,
including dust);
¡h) Routine maintenance activities invoMng fertitizers, pesticides, herbicides, detergents,
fuels, solvents, oils, etc.;
f i) On-site waste management practices (waste pites, tiquid wastes, dumpsters);
ü) Concrete truck/equipment washing, inctuding washing of the concretetruck chute and
associated fixtures and equipment;
(h) Dedicated asphalt, concrete batch ptants and masonry mixing stations;
Page 14 of 32
Permt No. COR400000
[L] Non-industrial waste sources such as worker trash and portable toilets.
vi. lmplementation of Control Àleasures. The SWMP must inctude design specifications that contain
information on the imptementation of att the structural and nonstructural contro[ measures in
use on the site in accordance with good engineering, hydrotogic and potlution control
practices; including, as applicabte, drawings, dímensions, instaltation information, materiats,
imptementation processes, control measure-specific inspection expectations, and maintenance
requirements.
The swMP must include a documented use agreement between the permittee and the owner or
operator of any control measures located outside of the permitted area, that are utitized by
the permittee's construction site for compliance with this permit, but not under the direct
control of the permittee. The permittee is responsibte for ensuring that att contro] measures
located outside of their permitted area, that are being utilized by the permittee's construction
site, are properly maintained and in compliance with atl, terms and conditions of the permit.
The SWMP must inctude a[[ information required of and retevant to any such control measures
located outside the permitted area, including tocation, instaltation specifications, design
specifications and maintenance requirements.
vii. Site Descriotion. The SWÂ{P must inctude a site description which inctudes, at a minimum, the
fol,towing:
tÊJ The nature of the construction activity at the site;
(þ) The proposed schedute for the sequence for major construction activÍtiesand the
planned implementation of control measures for each phase. (e.g. ctearing, grading,
utilities, vertical, etc. );
[c] Estimates of the total acreage of the site, and the acreage expected to be disturbed
by clearing, excavation, grading, or any other construction activities;
[dl A summary of any existing data and sources used in the development of the
construction site ptans or SWMP that describe the soil types found in the permitted
area and the erodibitity of the identified soil types;
¡e¡ A description of the percent cover of native vegetation on the site if the site is
undisturbed, or the percent cover of native vegetation in a simitar, [oca[ undisturbed
area or adequate reference area if the site is disturbed. lnctude the source or
methodotogy for determining the percentage. lf a percent cover is not appropriate for
the site location (i.e. arid), describe the technique and justification for the identified
cover of native vegetation;
(fi A description of any atlowabte non-stormwater discharges at the site, inctuding those
being discharged under a separate CDPS permit or a division low risk discharge
guidance policy, and appticable control measures installed;
(g) A description of the drainage pattems from the site, including a description of the
immediate source receiving the discharge and the receiving water(s) of the discharge,
if different than the immediate source. lf the stormwater discharge is to a municipal
separate storm sewer svstem, include the name of the entity owning that system, the
location(s) of the stormwater discharge, and the receiving water(s);
¡h) A description of atl stream crossings located within the construction site boundary; and
1i) A description of the altemate temporary stabitization schedule, if appticabte (Part
l.B.1.a.iii(a)).
Page 15 of 32
Permit No. COR400000
tj} A description of the altemative diversion criteria as approved by the division, if
appticabte (Part l.B. 1 .a.i(iX3)).
viii. Site lÁap. The SWMP must include a site map which inctudes, at a minimum, the fottowing:
(aJ Construction site boundaries;
tb) Ftow arrows that depict stormwater ftow directions on-site and runoff direction;
{c} Att areas of ground disturbance inctuding areas of borrow and filt;
tdl Areas used for storage of soit;
(ÊJ Locations of a[[ waste accumutation areas, including areas for tiquid, concrete,
masonry, and asphatt;
(f) Locations of dedicated asphalt, concrete batch plants and masonry mixing stations;
[g) Locations of atl structural control measures;
th) Locations of all non-structural control measures (e.g. temporary stabilization);
[i) Locations of springs, streams, wettands, diversions and other state waters, inctuding
areas that require pre-existing vegetation be maintained within 50 feet of a receiving
water, where determined feasible in accordance with Part l.B.l.a.i(e);
(j) Locations of att stream crossings located within the construction site boundary; and
flr) Locations where altemative temporary stabilization schedules appty.
ix. Temporary Stabitization, Finat Stabitization and Long Term Stormwater l{ânagement.
{ãJ The SÌVMP must document the constraints necessitating an atternative temporary
stabilization schedule, as referenced in Part 1.8.1.a.íii(a), provide the attemate
stabilization schedule, andidentify atl locations where the altemative schedule is
appticable on the site map.
tbl The SWMP must describe and locate the methods used to achieve finat stabilization of
att disturbed areas at the site, as [isted in Part LB.1.a.iii(b).
(c) The SWMP must describe the measures used to estabtish final stabitization through
vegetative cover or atternative stabitization method, as referenced in Part
l.B.1.a.iii(c), and describe and locate any temporary contro[ measures in place during
the process of finat stabilization.
td l The SWMP must describe and tocate any ptanned permanent control measures to
contro[ pollutants in stormwaterdischarges that witl occur after construction
operations are compteted, inctuding but not timited to, detention/retention ponds,
rain gardens, stormwater vaults, etc.
lnspection Reports. The SWMP must include documented inspection reports in accordance with
Part 1.D.5.c.
3" SWMP Review and Revisions
Permittees must keep a record of SWMP changes made that inctudes the date and identification of the
changes. The SWMP must be amended when the fotlowing occurs:
x
a. A change in design, construction, operation, or maintenance of the site requiring imptementation
Page 16 of 32
Permit No. COR400000
of new or revised control measures;
b. The SWMP proves ineffective in controtting poltutants in stormwater runoff in compliance with the
permit conditions;
c. Controt measures identified in the SWMP are no longer necessary and are removed; and
d. Corrective actions are taken onsite that result in a change to the SWMP.
e. The site or areas of the site quatifying for reduced frequency inspections under þ¡!-!.0.2[.
For SWMP revisions made prior to or fotlowing a change(s) onsite, including revisions to sections
addressing site conditions and control measures, a notation must be included in the SWMP that identifies
the date of the site change, the controt measure removed, or modified, the location(s) of those controt
measures, and any changes to the controt measure(s). The permittee must ensure the site changes are
reftected in the SWMP. The permittee is noncomptiant with the permit untit the SWMP revisions have
been made.
4. SWMP Avaitabitity
A copy of the SWMP must be provided upon request to the division, EPA, and any local agency with
authority for approving sediment and erosion plans, grading ptans or stormwater management plans
within the time frame specified in the request. lf the SWMP is required to be submitted to any of these
entities, the submission must inctude a signed certification in accordance with Part 1.4.3.e, certifying
that the SWMP is complete and compliant with alt terms and conditions of the permit.
A[t SWMPs required under this permit are considered reports that must be availabte to the public under
Section 308(b) of the CWA and Section 61.5(41of the CDPS regutations. The permittee must make ptans
availabte to members of the public upon request. However, the permittee may ctaim any portion of a
SWMP as confidential in accordance with 40 CFR Part 2.
D. SITE INSPECTIONS
Site inspections must be conducted in accordance with the foltowing requirements. The required inspection
schedutes are a minimum frequency and do not affect the permittee's responsibitity to implement control
measures in effective operating condition as prescribed in the SWMP, Part l.C.z.a.vi, as proper maintenance of
control measures may require more frequent inspections. Site inspections shall start within 7 calendar da¡a of
the commencement of construction activities on site.
Person Responsible for Conducting lnspections
The person(s) inspecting the site may be on the permittee's staff or a third party hired to conduct
stormwater inspections under the direction of the permittee(s). The permittee is responsibte for
ensuring that the inspector meets the definition of a Quatified Stormwater lvlanager. The inspector may
be different than the individuat(s) tisted in Part 1.C.2.a.i.
7, lnspection Frequency
Permittees must conduct site inspections in accordance with on the fottowing minimum frequencies,
unless the site meets the requirements of Part 1.0.3. Atl inspections must be recorded per Part 1.D.5.c.
a. At least one inspection every 7 catendar days; or
b. At teast one inspection every 14 catendar days, if post-storm event inspections are conducted
within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion.
Post-storm inspections may be used to fulfitt the 14-day routine inspection requirement.
c. When site conditions make the schedute required in this section impractical, the permittee may
t
Page 17 of 32
Permit No. COR400000
petition the division to grant an alternate inspection schedule. The atternatíve inspection schedute
must not be implemented prior to written approval by the division and incorporation into the
sWMP.
3. lnspection Frequency for Discharges to Outstanding Waters
Permittees must conduct site inspections at least once every 7 calendar days for sites that discharge to
a water body designated as an Outstanding Water by the Water Quatíty Control Commission.
4. Reduced lnspection FrequencY
The permittee may perform site inspections at the following reduced frequencies when one of the
fotlowing conditions exists:
a. Post-Storm lnspections at Temporaril,y ldte Sites
For permittees choosing an inspection frequenry pursuant to Part l.D.2.b and if no construction
activities witl occur fotlowing a storm event, post-storm event inspections must be conducted prior
to re-commencing construction activities, and no later than 72 hours followinE the storm event. lf
the post-storm event inspection quatifies under this section, the inspection delay must be
documented in the inspection record per Part 1.0.5,c. Routine inspections must stilt be conducted
at least every 14 calendar daYs'
b. lnspections at Completed Sites/Areas
When the site, or portions of a site, are awaiting establishment of a vegetative ground cover and
final stabitization, the permittee must conduct a thorough inspection of the stormwater
management system at least once every 30 da¡rs. Post-storm event inspections are not required
under this schedute. This reduced inspection schedute is attowed if att of the fotlowing criteria are
met:
c.
i. At[ construction activities resulting in ground disturbance are comptete;
ii. Att activities required for final stabitization, in accordance with Part l.B.l.a.iii{b) & (c) and
with the SWMP, have been completed, with the exception of the application of seed that has
not occurred due to seasonal conditions or the necessity for additionat seed apptication to
augment previous efforts; and
iii. The SWMP has been amended to locate those areas to be inspected in accordance with the
reduced schedule altowed for in this paragraph.
Winter Conditions Inspections Exctusion
lnspections are not required for sites that meet atL of the fottowing conditions: construction
activities are temporarity hatted, snow cover exists over the entire site for an extended period, and
metting conditions posing a risk of surface erosion do not exist. This inspection exception is
appticabl,e onty during the period where metting conditions do not exist, and appties to the routine
7-day,14-day and monthty inspections, as wetl as the post-storm-event inspections. When this
inspection exctusion is implemented, the fol,towing information must be documented in accordance
with the requirements in Part 1.C.3 and Part l.D.S.c:
i. Dates when snow cover existed;
ii. Date when construction activities ceased; and
iii. Date melting conditions began.
5. lnspection Scope
Page 18 of 32
Permit No. GOR400000
a. Areas to Be lnspected
When conducting a site inspection the foltowing areas, if appticabte, must be inspected for
evidence of, or the potentiat for, poltutants [eaving the construction site boundaries, entering the
stormwater drainage system or discharging to stâte waters:
i. Construction site perimeter;
ii. Att disturbed areas;
iii. Locations of installed contro[ measures;
iv. Designated haul routes;
v. Material and waste storage areas exposed to precipitation;
vi. Locations where stormwater has the potential to discharge offsite; and
vii. Locations where vehicles exit the site.
b. lnspection Requirements
i. Visuatty verify whether atl implemented control measures are in effective operational
condition and are working as designed in their specifications to minimize pollutant discharges.
ii. Determine if there are new potential sources of potlutants.
iii. Assess the adequacy of controt measures at the site to identify areas requiring new or modified
control measures to minimize potlutant discharges.
iv. ldentify atl areas of non-compliance with the permit requirements and, if necessâry,
implement corrective action(s) in accordance with Part 1.8.1.c.
c. lnspection Reports
The permittee must keep a record of all inspections conducted for each permitted site. lnspection
reports must identify any incidents of noncomptiance with the terms and conditions of this permit.
Att inspection reports must be signed and dated in accordance with Part 1.4.3.f. lnspection records
must be retained in accordance with Part ll.O. At a minimum, the inspection report must include:
i. The inspection date;
ii. Name(s) and titte(s) of personnet conducting the inspection;
iii. Weather conditions at the time of inspection;
iv. Phase of construction at the time of inspection;
v. Estimated acreage of disturbance at the time of inspection;
vi. Location(s) and identification of control measures requiring routine maintenance;
vii. Location(s) and identification of discharges of sediment or other pottutants from the site;
viii. Location(s) and identification of inadequate control measures;
ix. Location(s) and identification of additional control measures needed that were not in place at
the time of inspection;
Page 19 of 32
Permit No. COR400000
x. Description of corrective action(s) for items vii, viii, ix, above, dates corrective action(s) were
completed, including requisite changes to the SWMP, as necessary;
xi. Descriptíon of the minimum inspection frequency (either in accordance with Part 1.D.2, Part
LD.3 or Part 1.D.4.) utilized when conducting eâch inspection.
xii. Deviations from the minimum inspection schedule as required in Part 1.D.2. This woutd include
documentation of division approval for an atternate inspection schedule outtined in Part
t.D.2.c;
xiii. After adequate corrective action(s) have been taken, or where a report does not identify any
incidents requiring corrective action, the report shat[ contain a statement as required in Part
r.4.3.f.
E. DEFINITIONS
For the purposes of this permit:
1r¡ Bypass the intentional diversion of waste streams from any portion of a treatment facilityin
accordance with 40 CFR 122.41 (m)(1 ) (i) and Regutati on 61 .2(121.
p¡ Common Plan of Devetopment or Sate - A contiguous area where multiple separate and distinct
construction activities may be taking ptace at different times on different schedules, but remain
related. The division has determined that "contiguous" means construction activities located in
close proximity to each other (within 1/r mite). Construction activities are considered to be "retated"
if they share the same development ptan, builder or contractor, equipment, storage areas, etc.
"Common ptan of development or sale" includes construction activities that are associated with the
construction of fietd wide oit and gas permits for facitities that areretated.
(3) Construction Activity - Ground surface disturbing and associated activities (tand disturbance), which
inctude, but are not limited to, ctearing, grading, excavation, demolition, instatlation of new or
improved haul roads and access roads, staging areas, stockpÍling of fitt materiats, and borrow areas.
Construction does not inctude routine maintenance to maintain the original line and grade, hydrautic
capacity, or original purpose of the facitity. Activities to conduct repairs that are notpart of routine
maintenance or for reptacement are construction activities and are not routine maintenance.
Repaving activities where undertying and/or surrounding soil is exposed as part of the repaving
operation are considered construction activities. Construction activity is from initial ground breaking
to final stabilization regardtess of ownership of the construction activities.
(4) Control Measure - Any best management practice or other method used to prevent or reducethe
discharge of poltutants to state waters. Control measures include, but are not limited to, best
management practices. Control measures can inctude other methods such as the instatlation,
operation, and maintenance of structural controls and treatment devices.
(5) Control Measure Requiring Routine lvlaintenance - Any control measure that is still operating in
accordance with its design and the requirements of this permit, but requires maintenance to
prevent a breach of the control measure. See also inadequate control measure.
(ó) Dedicated Asphatt, Concrete Batch Plants and lvlasonry Mixing Stations - Are batch plants or mixing
stations located on, or within % mile of, a construction site and that provide materiats onty tothat
specific construction site.
(7) Diversion - Discharges of state waters that are temporarily routed through channels or structures
(e,g. in-stream, uncontaminated springs, non-pumped groundwater, temporary rerouting of surface
waters).
1e¡ Finat Stabitization - The condition reached when construction activities at the site have been
Page 20 of 32
Permft No. COR400000
compteted, permanent stabitization methods are complete, and temporary control measures are
removed. Areas being stabilized with a vegetative cover must have evenly distributed perennial
vegetation. The vegetation coverage must be, at a minimum, equal to 70 percent of what would
have been provided by native vegetation in a tocat, undisturbed area or adequate reference site.
(9) Good Engineering, Hydrologic and Pottution Control Practices: are methods, procedures, and
practices that:
a. Are based on basic scientific fact(s).
b. Reftect best industry practices and standards.
c. Are appropriate for the conditions and po[tutant sources.
d. Provide appropriate solutions to meet the associated permit requirements, inctuding
practice based efftuent limits.
1ro¡ lnadequate Control Measure - Any control measure that is not designed or imptemented in
accordance with the requirements of the permit and/or any control measure that is not
implemented to operate in accordance with its design. See also Control Measure RequiringRoutine
Maintenance.
(11) lnfeasibte - Not technologicatty possibte, or not economically practicabte and achievabte in tightof
best industry practices.
(12) Minimize - reduce or eliminate to the extent achievable using control measures that are
technotogicatty avaitabte and economicatty practicable and achievabte in tight of bestindustry
practice.
16¡ Municipatity ' A city, town, county, district, association, or other pubtic body created by, or under,
State law and having jurisdiction over disposal of sewage, industrial wastes, or other wastes, or a
desígnated and approved management agency under section 208 of CWA (1987).
1rn¡ Municipat Separate Storm Sewer System (MS4) - A conveyance or system of conveyances(inctuding
roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made
channels, or storm drains):
a. Owned or operiated by a State, city, town, county, district, association, or other pubtic
body (created by or pursuant to State taw) having jurisdiction over disposa[ of sewage,
industrial wastes, stormwater, or other wastes, including special districts under State
[aw such as a sewer district, flood controt district or drainage district, or simitar entity,
or a designated and approved management agency under section 208 of the CWA that
discharges to state waters;
i. Designed or used for cottecting or conveying stormwater;
ii. Are not a combined sewer; and
iii. Are not part of a Pubticty Owned Treatment Works (POTW). See 5 CCR 1002-
61.2(62).
1rs¡ Municipal Stormwater Management Program - A stormwater program operated by a municipatity,
typicatty to meet the requirements of the municipatities fu154 discharge certification.
1ro¡ Operator - The party that has operational control over day-to-day activities at a project sitewhich
are necessary to ensure comptiance with the permit. This party is authorized to direct individuats at
a site to carry out activities required by the permit (i.e. the general contractor).
Page 21 of 32
Permft No. COR400000
1rz¡ Outstanding Waters - Waters designated as outstanding waters pursuant to Regulation 31, Section
31.8(2)(a). The highest [eve[ of water quatity protection appties to certain waters that constitute an
outstanding state or national resource.
(is) Owner - The party that has overall control of the activities and that has funded the implementation
of the construction plans and specifications. This is the party that may have ownership of, a long
term lease of, or easements on the property on which the construction activity is occurring (e.g. the
developer).
(r9) Permittee(s) - The owner and operator named in the discharge certification issued underthis permit
for the construction site specified in the certification.
(20) Point Source - Any discernibte, confined, and discrete conveyance, including, but not [imited to, any
pipe, ditch, channel, tunnet, conduit, wett, discrete fissure, container, rotling stock, concentrated
animal feeding operation, or vessel or other floating craft, from which poltutants are or may be
discharged. Point source does not include irrigation return flow. See 5 CCR 102-ól ,2(75).
1zt¡ Potlutant - Dredged spoit, dirt, sturry, solid waste, incinerator residue, sewage, sewage sludge,
garbage, trash, chemical waste, bioto$cat nutrient, biotogicat material, radioactive materiat, heat,
wrecked or discarded equipment, rock, sand, or any industriat, municipal or agricultural waste. See
5 CCR 1002-61.2(76).
1zz¡ Presentation of credentiats - a government issued form of identification, if in person; or (ii)
providing name, position and purpose of inspection if request to enter is made via telephone, email
or other form of etectronic communication. A Permittee's non-response to a request to enter upon
presentation of credentials constitutes a denial to such request, and may resutt in viotation of the
Permit.
1zr¡ Process Water - Any water which, during manufacturing or processing, comes into contact withor
results from the production of any raw materiat, intermediate product, finished product, by product
or waste product.
(24) Pubtic Emergency Retated Site - a project initiated in response to an unanticipated emergency (e.g.,
mud slides, earthquake, extreme ftooding conditions, disruption in essential pubtic services), for
which the retated work requires immediate authorization to avoid imminent endangerment to
human heatth or the environment, or to reestablish essential pubtic services.
(25) Quatified Stormwater Manager - An individual knowtedgeable in the principtes and practices of
erosion and sediment control and potlution prevention, and with the skitts to assess conditionsat
construction sites that could impact stormwater quality and to assess the effectiveness of
stormwater controls imptemented to meet the requirements of this permit.
(2ó) Quatifying Local Program - A municipal program for stormwater discharges associated withsmatl
construction activity that was formatly approved by the division as a quatifying local program.
(27) Receiving Water - Any ctassified or unclassified surface water segment (inctuding tributaries) inthe
State of Cotorado into which stormwater associated with construction activities discharges. This
definition inctudes a[[ water courses, even if they are usualty dry, such as borrow ditches, arroyos,
and other unnamed waterways.
e8) Severe Property Damage - substantial physicat damage to properLy, damage to the treatment
facitities which causes them to become inoperable, or substantial and permanent loss of natural
resources which can reasonably be expected to occur in the absence of a bypass. Severe property
damage does not mean economic loss caused by detays in production. See 40 CFR122.41(m)(1)(ii).
e9) Significant Materials - lnclude, but not limited to, raw materiats; fuets; materials such as solvents,
detergents, and plastic pettets; finished materiats such as metallic products; raw materiats used in
Page22of 32
Permit No. COR400000
food processing or production; hazardous substances designated under section f01(14) of CERCI-A;
any chemicat the permittee is required to report under section 313 of Titte lll of the Superfund
Amendments and Reauthorization Act (SARA); fertitizers; pesticides; and waste products such as
ashes, stag and sludge that have the potential to be released with stormwaterdischarges.
(30) Smatt Construction Activity - The discharge of stormwater from construction activities that result in
tand disturbance of equal to, or greater than, one acre and less than five acres. Sma[[ construction
activity atso inctudes the disturbance of less than one acre of total land area that is part of a larger
common ptan of devetopment or sate, if the larger common ptan ultimatety disturbs equal to, or
greater than, one acre and less than five acres.
tsrl Spitt - An unintentional release of solid or tiquid materiat which may pottute statewaters.
(32) State Waters - means any and a[[ surface and subsurface waters which are contained in or ftow in or
through this state, but does not inctude waters in sewage systems, waters in treatment works of
disposat systems, waters in potabte water distribution systems, and atl water withdrawn for use until
use and treatment have been completed.
(33) Steep Stopes: where a tocal government, or industry technical manual (e.g. stormwater BMP manual)
has defined what is to be considered a "steep stope", this permit's definition automaticalty adopts
that definition. Where no such definition exists, steep stopes are automaticalty defined as those that
are 3:1 or greater.
1rl¡ Stormwater - Precipitation runoff, snow mett runoff, and surface runoff and drainage. See 5CCR
1002-6',t.2(r03).
(35) Totat Maximum Daity Loads (TMDLS) -The sum of the individual wastetoad attocations (WLA) for point
sources and toad attocations (l-A) for nonpoint sources and natural background. For the purposes of
this permit, a TMDL is a calcutation of the maximum amount of a poltutant that a waterbody can
receive and stitt meet water quatity standards, and an allocation of that amount to the pottutant's
sources. A TMDL includes WLAS, ús, and must inctude a margin of safety (MOS), and account for
seasona[ variations. See section 303(d) of the CWA and 40 C.F.R. 130.2 and 130.7.
(3ó) upset - an exceptional incident in which there is unintentional and temporary noncompliancewith
permit efftuent timitations because of factors beyond the reasonabte control of the permittee. An
upset does not include noncomptiance to the extent caused by operational error, improperly
designed treatment facilities, inadequate treatment facitities, lack of preventative maintenance, or
careless or improper operation in accordance with 40 CFR 122,4'l(n) and Regutation 61.2(1141.
F. MONITORING
The division may require sampting and testing, on a case-by-case basis. lf the division requires sampling and
testing, the division witl send a notification to the permittee. Reporting procedures for any monitoring data
coltected witt be included in the notification.
lf monitoring is required, the fotlowing appl,ies:
1. The thirty (30) day average must be determined by the arithmetic mean of atl samptes cotlected
during a thirty (30) consecutive-day period; and
2. A grab sampte, for monitoring requírements, is a singte "dip and take" sampte.
G. OIL AND GAS CONSTRUCTION
Stormwater discharges associated with construction activities directly retated to oil and gas exptoration,
production, processing, and treatment operations or transmission facitities are regulated under the Cotorado
Discharge Permit System Regutations (5 CCR '1002-61), and require coverage under this permit in accordance
with that regulation. However, references in this permit to specific authority under the CWA do not appty to
l
Page 23 of 32
Permt No. COR400000
stormwater discharges associated with these oil and gas related construction activities, to the extent that the
references are limited by the federat Energy Poticy Act of 2005.
,l
Page24 of 32
Permt No. COR400000
Part ll: Standard Permit Conditions
A. DUTY TO COMPLY
The permittee must comply with a[[ conditions of this permit. Any permit noncompliance constitutes a
viotation of the Water Quatity Controt Act and is grounds for:
1. Enforcement action;
2. Permit termination, revocation and reissuance, or modification; or
3. Denial of a permit renewal application.
B. DUTY TO REAPPLY
lf the permittee wishes to continue an activity regutated by this permit after the expiration date of this
permit, the permittee must appty for and obtain authorization as required by Pan 1.4.3.k. of the permit.
C. NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE
It shatt not be a defense for a permittee in an enforcement action that it would have been necessary to halt or
reduce the permitted activity in order to maintain compliance with the conditions of this permit.
D. DUTY TO MITIGATE
A permittee must take atl reasonabte steps to minimize or prevent any discharge in violation of this permit
which has a reasonabte liketihood of adversely affecting human heatth or the environment.
E. PROPER OPERATION AND MAINTENANCE
A permittee must at atl times properly operate and maintain att facitities and systems of treatment and control
(and retated appurtenances) that are instatled or used by the permittee to achieve compliance with the
conditions of this permit. Proper oper:.rtion and maintenance atso includes adequate laboratory controls and
appropriate quatity assurance procedures. This provision requires the operation of backup or auxitiary facitities
or similar systems which are instatled by the permittee only when the operation is necessary to achieve
compliance with the conditions of this permit. This requirement can be met by meeting the requirements for
Part 1.8., 1.C., and l.D. above. See also 40 C.F.R. 5122.41(e).
F. PER¡AIT ACTIONS
This permit may be modified, revoked and reissued, or terminated for cause. The permittee request for a
permit modification, revocation and reissuance, or termination, or a notification of planned changes or
anticipated noncompliance does not stay any permit condition. Any request for modification, revocation,
reissuance, or termination under this permit must comply with att terms and conditions of Regutation óf .8(8)
G. PROPERTY RIGHTS
ln accordance with 40 CFR122.41(g) and 5 CCR 1002-61, 61.8(9):
1. The issuance of a permit does not convey any property or water rights in either real or personal
property, or stream ftows or any exclusive privitege.
2. The issuance of a permit does not authorize any injury to person or property or any invasíon of
personal rights, nor does it authorize the infringement of federat, state, or [oca[ laws or regulations.
3. Except for any toxic effluent ståndard or prohibition imposed under Section 307 of the Federal act or
any standard for sewage studge use or disposal under Section 405(d) of the Federal act, compliance
with a permit during its term constitutes compliance, for purposes of enforcement, with Sections 301,
Page 25 of 32
Permt No. COR400000
302, 306, 318, 403, and 405(a) and (b) of the Federal act. However, a permit may be modified,
revoked and reissued, or terminated during its term for cause as set forth in Section ó1.8(8) of the
Colorado Discharge Permit System Regulations.
H. DUTYTO PROVIDE INFORMATION
The permittee sha[[ fumish to the division, within a reasonable time, any information which the division may
request to determine whether cause exists for modifying, revoking and reissuing, or terminating this permit, or
to determine compliance with this permit. The permittee sha[[ also furnish to the division, upon request,
copies of records required to be kept by this permit in accordance with 40 CFR 122.41(hl andlor Regulation
ó1.8(3Xq).
I. INSPECTION AND ENTRY
The permittee shatl attow the division and the authorized representative, upon the presentation of credentiats
as required by [aw, to atlow for inspections to be conducted in accordance with 40 CFR 122.41(i'), Regulation
ó1.8(3), and Regulation 61.8(4):
1. To enter upon the permittees premises where a regulated facitity or activity is [ocatedor in which any
records are required to be kept under the terms and conditions of this permi$
2. At reasonable times to have access to and copy any records required to be kept underthe terms and
conditions of this permit;
3, At reasonable times, inspect any monitoring equipment or monitoring method required in the permit;
and
4. To enter upon the permittee's premises in a reasonable manner and at a reasonable time to inspect or
investigate, any actuat, suspected, or potential source of water poltution, or any viotation of the
Colorado Water Quatity Control Act. The investigation may include: sampling of any discharges,
stormwater or process water, taking of photographs, interviewing site staff on atteged violations and
other matters retated to the permit, and assessing any and at[ facilities or areas within the site that
may affect discharges, the permit, or an atleged viotation.
The permittee shatl provide access to the division or other authorized representatives upon
presentation of proper credentiats. A permittee's non-response to a request to enter upon
presentation of credentiats constitutes a denial of such request, and may resutt in a violation of the
permit.
J. MONITORING AND RECORDS
1. Samptes and measurements taken for the purpose of monitoring must be representativeof the votume
and nature of the monitored activity.
2. The permittee must retain records of att monitoring information, including all catibration and
maintenance records and alt original strip chart recordings for continuous monitoring instrumentation,
copies of alt reports required by this permit, and records of a[[ data used to complete the apptication
for this permit, for a period of at least three years from the date the permit expires or the date the
permittee's authorization is terminated. This period may be extended by request of the division at
any time.
3. Records of monitoring information must Ínctude:
a, The date, exact ptace, and time of sampting or measurements;
b. The individuat(s) who performed the sampling or measurements;
c. The date(s) anatyses were performed
Page 26 of 32
Permit No. COR400000
d. The individuat(s) who performed the anatyres;
e. The analytical techniques or methods used; and
f . The results of such analyses.
4, Monitoring must be conducted according to test procedures approved under 40 CFR Part 136, unless
other test procedures have been specified in the permit'
K. SIGNATORY REQUI REMENTS
I " Authorization to Sign:
Att documents required to be submitted to the division by the permit must be signed in accordance with
the foltowing criteria:
a. For a corporation: by a responsibte corporate officer. For the purpose of this subsection, a
responsible corporate officer means:
i. A president, secretary, treasurer, or vice president of the corpontion in charge of a principal
business function, or any other person who performs simitar poticy- or decision-making
functions for the corporation, or
ii. The manager of one or more manufacturing, production, or operating facilities, provided, the
manager is authorized to make management decisions which govern the operation of the
regutated facitity including having the expticit or implicitduty of making major capital
investment recommendations, and initiating and directing other comprehensive measures to
assure long term environmental comptiance with environmental laws and regulations; the
manager can ensure that the necessary s),rstems are estabtished or actions taken to gather
complete and accurate information for permit apptication requirements; and where authority
to sign documents has been assigned or delegated to the manager in accordance with
corporate Procedures.
b. For a partnership or sote proprietorship: by a generat partner or the proprietor, respectivety; or
c. For a municioatity, state, federat, or other public agency: By either a principat executive officer or
ranking etected official. For purposes of this subsection, a principal executive officer of a federal
agency includes
i. The chief executive officer of the agency, or
ii. A senior executive officer having responsibitity for the overatl operatíons ofa principal
geographic unit of the agency. (e.g. Regional Administrator of EPA)
7. EtectronicSignatures
For persons signing applications for coverage under this permit etectronicatty, in addition to meeting
other appticabte requirements stated above, such signatures must meet the same signature,
authentication, and identity-proofing standards set forth at 40 CFR g 3.2000(b) for electronic reports
(inctuding robust second-factor authentication). Compliance with this requirement can be achieved by
submitting the application using the Colorado Environmental Ontine Service (CEOS) system.
3. Change in Authorization to Sign
lf an authorization is no longer accurate because a different individual or position has responsibitity for
the overalt operation of the facility, a new authorization must be submitted to the division, prior to the
re-authorization, or together with any reports, information, or applications to be signed by an
authorized representative.
Page27 of 32
Permit No. COR400000
L. REPORTING REQUI REIAENTS
1. Planned Changes
The permittee shall give advance notice to the division, in writing, of any ptanned physical altentions
or additions to the permitted facitity in accordance with 40 CFR 122.41(ll and Regutation 6f .8(5Xa).
Notice is required only when:
a. The alteration or addition to a permitted facitity may meet one of the criteria for determining
whether a facitity is a new source in 40 CFR 122.29(b); or
b. The atteration or addition coutd significantty change the nature or increase the quantity of
potlutants discharged. This notification applies to pol[utants which are subject neither to effluent
timitations in the permit, nor to notification requirements under 40 CFR 122.41(a)(1).
?., Anticipated Non-Compliance
The permittee shalt give adlance notice to the division, in writing, of any planned changes in the
permitted facitity or activity that may result in noncomptiance with permit requirements. The timing of
notification requirements differs based on the type of non-comptiance as described in subparagraphs 5,
6,7, and 8 below.
3, Transfer of Ownership or Control
The permittee shall notify the division, in writing, ten (10) calendar days in advance of a proposed
transfer of the permit. This permit is not transferable to any person except after notice is given to the
division.
a. Where a facitity wants to change the name of the permittee, the original permittee (the first owner
or operators) must submit a Notice of Termination.
b. The new owrìer or operator must submit an apptication. See also signature requirements in Part
ll.K, above.
c. A permit may be automatically transferred to a new permittee if:
i. The current permittee notifies the division in writing 30 catendar days in advance of the
proposed transferdate; and
ii. The notice includes a written agreement between the existing and new permittee(s)
containing a specific date for transfer of permit responsibitity, coverage and tiabitity between
them; and
iii. The division does not notify the existing permittee and the proposed new permittee of its
intent to modify, or revoke and reissue the permit.
iv. Fee requirements of the Colorado Discharge Permit System Regulations, Section ó1.15, have
been met.
4. Monitoring reports
Monitoring results must be reported at the intervats specified in this permit per the requirements of 40
cFR 122.4r(tX4).
5. ComplianceSchedutes
Reports of compliance or noncompliance with, or any progress reports on, interim and final
requirements contåined in any comptiance schedule in the permit, shall be submitted on the date tisted
Page 28 of 32
Permit No. COR400000
in the comptiance schedute section. The fourteen (14) calendar day provision in Regulation 61.8(4)(n)(i)
has been incorporated into the due date.
6. Twenty-four Hour Reporting
In addition to the reports required elsewhere in this permit, the permittee sha[[ report the fottowing
circumstances oralty within twenty-four (24) hours from the time the permittee becomes aware of the
circumstances, and shall mail to the division a written report containing the information requested
within five (5) working days after becoming aware of the fottowing circumstances:
a. Circumstances leading to any noncompliance which may endanger health or the environment
regardless of the cause of the incident;
b. Circumstances teading to any unanticipated bypass which exceeds any effluent limitations in the
permit;
c. Circumstances leading to âny uDset which causes an exceedance of any effluent limitation in the
permit;
d. Daily maximum violations for any of the poltutants timited by Part I of this permit. This inctudes any
toxic pollutant or hazardous substance or any poltutant specificatly identified as the method to
control any toxic pollutant or hazardous substance.
ô The division may waive the written report required under subparagraph ó of this section if the oral
report has been received within 24 hours.
T, Other Non-Comptiance
A permittee must report atl instances of noncompliance at the time monitoring reports are due. lf no
monitoring reports are required, these reports are due at least annually in accordance with Regulation
61.8(4Xp). The annual report must contain atl instances of non-comptiance required under either
subparagraph 5 or subparagraph 6 of this subsection.
8. Other lnformation
Where a permittee becomes aware that it faited to submit any relevant facts in a permit application, or
submitted incorrect information in a permit application, or in any report to the Permitting Authority, it
has a duty to promptty submit such facts or information.
M. BYPASS
1. Bypass Not Exceeding Limitations
The permittees may altow any bypass to occur which does not cause efftuent limitâtions to be
exceeded, but only if it also is for essentia[ maintenance to assure efficient operation. These bypasses
are not subject to the provisions of Part ll.M.2 of this permit. See 40 CFR122.41lmx2).
L. Notice of Bypass
a. Anticipated bypass. lf the permittee knows in advance of the need for a bypass, the permittee must
submit prior notice, if possibte at least ten da¡rs before the date of the bypass. ee 40 CFR
Sf 22.a1 (m)(3)(i) and/or Regulation 61.9(5Xc).
b. Unanticipated bypass. The permittee must submit notice of an unanticipated bypass in accordance
with Part ll.L.ó. See 40 CFR 5122.4r (m)(3)(ii).
3. Prohibition of Bypass
Page 29 of 32
Permit No. COR400000
Bypasses are prohibited and the division may take enforcement action against the permittee for bypass,
untess:
a. The bypass is unavoidable to prevent loss of [ife, perconal injury, orsevere oroÞertv damaqe;
b. There were no feasible alternatives to the bypass, such as the use of arxitiary treatment facilities,
retention of untreated wastes, or maintenance duringnormal periods of equipment downtime. This
condition is not satisfied if adequate backup equipment should have been instatled in the exercise
of reasonable engíneering judgment to prevent a bypass which occurred during normal periods of
equipment downtime or preventive maintenance; and
c. Proper notices were submÍtted to the division.
N. UPSET
1. Effect of an upset
An upset constitutes an affirmative defense to an action brought for noncomptiance with permit effluent
limitations if the requirements of Part ll.N.2. of this permit are met. No determination made during
administrative review of claims that noncompliance was caused by upset, and before an action for
noncomptiance, is final administrative action subject to judicial review in accordance with Regutation
6r.8(3Xj).
2. Conditions Necessary for Demonstration of an Upset
A permittee who wishes to establish the affirmative defense of upset shalt demonstrate through
property signed contemporaneous operating logs, or other relevant evidence that:
a. An upset occurred and the permittee can identify the specific cause(s) of the upset;
b. The permitted facitity was at the time being properly operated and maintained; and
c. The permittee submitted proper notice of the upset as required in Part ll.L.6.(24- hour notice); and
d. The permittee comptied with any remedial measure necessary to minimize or prevent any discharge
or studge use or disposat in violation of this permit which has a reasonabte tiketihood of advenely
affecting human heatth or the enyironment. ln addition to the demonstration required above, a
permittee who wishes to estabtish the affirmative defense of upset for a viotation of efftuent
timitations based upon water quality standards shall also demonstrate through monitoring,
modeting or other methods that the relevant standards were achieved in the receiving water.
3. Burden of Proof
ln any enforcement proceeding, the permittee seeking to establish the occurrence of an upset has the
burden of proof.
O. RETENTION OF RECORDS
1. Post-Expiration orTermination Retention
Copies of documentation required by this permit, inctuding records of alt data used to complete the
apptication for permit coverage to be covered by this permit, must be retained for at teast three years
from the date that permit coverage expires or is terminated. This period may be extended by request of
EPA at any time.
2. On-site Retention
The permittee must retain an electronic version or hardcopy of the SWMP at the construction site from
Page 30 of 32
Permit No. COR400000
the date of the initiation of construction activities to the date of expiration or inactivation of permit
coverage; unless another [ocation, specified by the Dermittee, is approved by the division.
P. REOPENER C].AUSE
1" Procedures for Modification or Revocation
Permit modification or revocation of this permit or covenge under this permit witt be conducted
according to Regutation 61.8(8).
7.. Water Quatity Protection
lf there is evidence indicating that the stormwater discharges authorized by this permit cause, have the
reasonable potentiat to cause or contribute to an excursion above any applicable water quatity
standard, the permittee may be required to obtain an individual permit, or the permit may be modified
to include different timitations and/or requirements.
q. SEVERAB¡L|TY
The provisions of this permit are severabte. lf any provisions or the application of any provision of this permit
to any circumstances, is hetd invalid, the apptication of such provision to other circumstances and the
apptication of the remainder of this permit sha[[ not be affected.
R. NOTIFICATION REQUIRE¡AENTS
1. Notification to Parties
Atl notification requirements, exctuding information submitted using the CEOS portal, shatt be directed
as follows:
a. Orat Notifications, during normal business hours shall be to:
Clean Water ComPtiance Section
Water QuatitY Control Division
Telephone: (303) 692-3500
b. Written notification shatl be to:
Clean Water Comptiance Section
Water Quatity Control Division
Colorado Department of Pubtic Health and Environment
wqcD-wQP-82
4300 Cherry Creek Drive South
Denver, CO 80246-1530
S. RESPONSIBILITIES
X. Reduction, Loss, or Failure of Treatment Facitity
The permittee has the duty to hatt or reduce any activity if necessary to maintain compliance with the
efftuent timitations of the permit. lt shalt not be a defense for a permittee in an enforcement action
that it woutd be necessary to hatt or reduce the permitted activity in order to maintain compliance with
the conditions of this Permit.
T. OIL AND HAZARDOUS SUBSTANCE LIABILITY
Nothing in this permit shatt be construed to prectude the institution of any tegal action or relieve the
permitiee from any responsibitities, liabilities, or penalties to which the permittee is or may be subject to
under Section 311 (Oit and Hazardous Substance Liabitity) of the CWA.
Page 31 of 32
Permit No. COR400000
U. EMERGENCY POWERS
Nothing in this permit shatl be construed to prevent or limit apptication of any emergency power of the
division.
V, CONFIDENTIALITY
Any information retating to any secret process, method of manufacture or production, or sales or marketing
data which has been dectared confidential by the permittee, and which may be acquired, ascertained, or
discovered, whether in any sampting investigation, emergency investigation, or otherwise, shatl not be pubticty
disctosed by any member, officer, or employee of the Water Quatity Control Commission or the division, but
shatt be kept confidentiat. Any person seeking to invoke the protection of this section shall bear the burden of
proving its appticabitity. This section shatl never be interpreted as preventing futt disctosure of efftuent data.
W. FEES
The permittee is required to submit payment of an annuat fee as set forth in the 2016 amendments to the
Water Quatity Controt Act. Section 25-8-502 (1 .1 ) (b), and the Cotorado Discharge Permit System Regulations 5
CCR 1002-61, Section 6l .15 as amended. Faiture to submit the required fee when due and payabte is a
viotation of the permit and witt resutt in enforcement action pursuant to Section 25-8-601 et. seq., C.R.S.1973
as amended.
X. DURATION OF PER¡AIT
The duration of a permit shatt be for a fixed term and shatl not exceed five (5) years. lf the permittee desires
to continue to discharge, a permit renewal application shal,t be submitted at least ninety (90) catendar days
before this permit expires. Fiting of a timety and complete application shatl cause the expired permit to
continue in force to the effective date of the new permit. The permifs duration may be extended only through
administrative extensions and not through interim modifications. lf the permittee anticipates there witl be no
discharge after the expiration date of this permit, the division should be promptty notified so that itcan
terminate the permit in accordance with Part 1.4.3.i.
Y. SECTTON 307 TOXICS
lf a toxic efftuent standard or prohibition, including any applicable schedute of compliance specified, is
estabtished by regutation pursuant to Section 307 of the Federal Act for a toxic poltutant which is present in
the permittee's discharge and such standard or prohibition is more stringent than any limitation upon such
pottutant in the discharge permit, the division shatl institute proceedings to modify or revoke and reissue the
permit to conform to the toxic efftuent standard or prohibition
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMP)
TAB 12
APPENDIX C: MISCELLANEOUS
Summit Services Group, LLC Denver, CO
www.summitseryicesqroup.com
l-800-540-7967
West Glenwood Property
Gould Construction, lnc.
Stormwater Managemenl Plan (SWMP)
TAB 13
APPENDIX D: AMENDMENT LOG
Summit Services Group, LLC Denver, CO
www.summitservicesqroup.com
1-800-540-7967
West Glenwood PropertyGould Construction, lnc.Stormwater Management Plan (SWMP)Amendment #SWMP Amendment LogSWMP Ref.SectlonDescription of ArnendmentDate of AmendmentPrepared bySummit Services Group, LLC Denver, COwww.summ¡tservicesgrouo.com1-800-540-7967
I
West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan (SWMp)
TAB 14
APPENDIX E: SITE-SPECIFIC MAPS
Summit Services Group, LLC Denver, CO
www.summitserv¡cesq roup.com
I -800-540-7967
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West Glenwood Property
Gould Construction, lnc.
Stormwater Management Plan {SWMp)
TAB 15
APPENDIX F: SOILS REPORT
Summit Services Group, LLC Denver, CO
www.summitserviceso rou p.com
1-800-540-7967
USDA
=-
United States
Department of
Agriculture
NRCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Gustom Soil Resource
Report for
Rifle Area, Colorado,
Parts of Garfield and
Mesa Counties
West Glenwood Property
March 15,2022
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs1 42p2_053951 ).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
lnformation about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parentalstatus, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at(202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 lndependence Avenue, S.W., Washington, D.C.20250-9410 or
call (800) 795-3272 (voice) or (202)720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Gontents
Preface.......
Soil Map.........................
Soil Map......
Legend........
Map Unit Legend.........
Map Unit Descriptions.
Rifle Area, Colorado, Parts of Garfield and Mesa Counties
8-Atencio-Azeltine complex, 1 to 3 percent slopes....
G7-Torriorthents-Rock outcrop com plex, steep..........
Soil lnformation for All Uses......
Soil Properties and Qualities......
Soil Erosion Factors........
K Factot Whole Soi|..............
Wind Erodibility Group....
Soil Qualities and Features................
Hydrologic Soil Group...
References
2
5
6
7
I
o
.... 1 5
.....20
.....25
....25
....31
4
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
5
=RRæ{ÐM29(Ðæ51S¡4ap Scaþ: 1:3,030 if prt&d on A h&cape (11' x 8.$) *red.lvleÞs0 40 80 160 2ÆRd01æm4æ6æ¡@ poiìctin: \Âreb fvlsrãbr Corner @r&ræs: WcS84 RlSe ti:s: UTM Ane ßN WGS84Gustom Soil Resource ReportSoilMapÆm3Ræ5340æ3{foM39 3g4qN3F 33SNãRàtEEsËÐFqEEea3ç 349Næê 3335"NNAæßææt0&1offi=to3ñ-6
Custom Soil Resource ReportMAP LEGENDMAP INFORMATIONThe soil surveys that comprise your AOI were mapped at1:24,000.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsd¡stance and area. A project¡on that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurvey Area Data: Version 14, Sep 2,2021Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Sep 24, 2015-Nov2,2015The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundArea of lnterest (AOl): Area of lnterest (AOl)Soils[f Soil Map Unit Polygonsl*Ë Soil MaP Unit Linesi!_ Soil Map Unit PointsSpec¡al Po¡nt Featurestg, BlowoutH Borrow PitX Clay SpotS Closed Depressionþ{ Gravel Pitf, Gravelly Spot# Landfill{t Lava Flow"t Marsh or swampæ Mine or Quarry& Miscellaneous Water6 Perennia¡ Water\f' RockOutcroP+ Saline Spot:.: Sandy Spotë! Severely Eroded Spot# Sinkholeþ Slide or Slipø Sodic Spotã Spoil Area* Stony Spotffi VeryStonySpot{f wet spot* Other*- Special Line FeaturesWater FeaturesStreams and CanalsTransportation|{+ RailsA, Interstate HighwaysyW US Routes.:: Major RoadsLocal RoadsBackgroundI Aerial Photography7Warning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstand¡ng of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.
Custom Soil Resource ReportMAP LEGENDMAP INFORMAf,IONimagery displayed on these maps, AS a resulq some minorofB
l
Custom Soil Resource Report
Map Unit Legend
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
obserued properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties simílar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, howeve¡ have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. lf included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. lf intensive use of small areas is planned, however,
I
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
B Atencio-Azeltine complex, 1 to
3 percent slopes
r 3.9 98.2o/o
67 Torriorthents-Rock outcrop
complex, steep
0.3 L8o/o
Totals for Area of lnterest 14.1 100.0%
Custom Soil Resource Report
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
propetties and qualities.
Soils that have profiles that are almost alike make up a sol/ serles. Except for
differences in texture of the suface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into so/ phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An assocrafion is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
10
Custom Soil Resource Report
Rifle Area, Goloradon Parts of Garfield and Mesa Gounties
8-Atencio-Azeltine complex, I to 3 percent slopes
Map Unit Setting
National map unit symbol: jnzd
Elevation: 5,000 to 7,000 feet
F a rm I a n d c I a ssifi cati on: Farm land of statewide importance
Map Unit Gomposition
Atencio and similar sols; 50 percent
Azeltine and similar solls; 45 percent
Minor componenfs; 5 percent
Esfimafes are based on obseruations, descriptions, and fransecfs of the mapunit.
Description of Atencio
Setting
Landform: Terraces, alluvial fans
Landform position (three-dimensional) : Tread
Down-slope shape; Gonvex
.4cross-s/ope shape; Convex
Parent material: Mixed alluvium derived from sandstone and shale
Typicalprofile
H1 - 0 to 11 inches.' sandy loam
H2 - 11 to 23 inches: gravelly sandy clay loam
H3 - 23 to 2B inches; gravelly sandy loam
H4 - 28 to 60 inches: extremely cobbly sand
Properties and qualities
S/ope:lto3percent
Depth to restrictive feature: More than 80 inches
Drainage c/ass; Well drained
Runoffclass: Low
Capacity of the most limiting layer to transmit water (Ksat); Moderately high to high
(0.20 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of pondrng: None
Calcium carbonate, maximum content: 10 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 3.8 inches)
lnterpretive groups
Land capability classification (irrigated): 4s
Land capability classification (nonirrigated): 4s
Hydrologic Soil Group: B
Ecologicalsife: R048AY306UT - Upland Loam (Wyoming Big Sagebrush)
Hydric sotT rafrng: No
Description of Azeltine
Setting
Landform: Alluvial fans, terraces
La n dfo r m p o s iti o n (th re e - d i m e nsrrcnal) ; Tread
11
Custom Soil Resource Repoñ
Down-slope shape: Linea¡ convex
Across-s/ope shape: Linea¡ convex
Parent material: Mixed alluvium derived from sandstone and shale
Typical profile
H1 - 0 to 18 inches; gravelly sandy loam
H2 - 1B to 60 inches: extremely gravelly sand
Properties and qualities
S/ope:l to3percent
Depth to restrictive feature: More than 80 inches
Drainage c/ass: Well drained
Runoff class: Very low
Capacity of the most limiting layer to transmit water (Ksat); Moderately high to high
(0.60 to 6.00 in/hr)
Depth to water table: More than 80 inches
Frequency of f/oodrng; None
Freq uency of pondrng: None
Calci um carbonate, maxi mu m conte nt: 1 0 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 2.5 inches)
Interpretive groups
Land capability classification (irrigated): 4s
Land capability classification (nonirrigated): 4s
Hydrologic Soil Group: A
Ecologicalsde: R04BAY306UT - Upland Loam (Wyoming Big Sagebrush)
Hydric so/ rafing: No
Minor Components
Gravel pits
Percent of map unit: 5 percent
Landform: Terraces, alluvial fans
La n dfo rm p o s iti o n (t h re e -d i m e nsional) ; Tread
Hydric so/ rafrng; No
67-To rri orth e nts- Rock o utcrop com plex, steep
Map Unit Setting
Nationalmap unit symbol: jnz5
Elevation: 5,800 to 8,500 feet
Mean annualprecipitation; 10 to 15 inches
Mean annual air temperature: 39 to 46 degrees F
Frost-free period: 80 to 105 days
Farmland classification: Not prime farmland
Map Unit Gomposition
Torriofthents, sfeep, and similar soi/s; 60 percent
Rock outcrop, steep:25 percent
12
Custom Soil Resource Report
Esfimafes are based on obseruations, descriptions, and fransecfs of the mapunit.
Description of Torriorthents, Steep
Setting
Landform : Mountainsides
La n dfo rm position (two-d i m e n sio n a l) : Footslope
Landform position (three-dimensional): Mountainflank, base slope
Down-slope shape: Concave, convex
,Across-s/op e shape : Concave, convex
Parent material: Stony, basaltic alluvium derived from sandstone and shale
Typical profile
H1 - 0 to 4 inches: variable
H2 - 4 to 30 inches.' fine sandy loam
H3 - 30 to 34 inches: unweathered bedrock
Properties and qualities
S/ope; 15 to 70 percent
Depth to restrictive feature:4 to 30 inches to lithic bedrock
Drainage c/ass: Well drained
Runoffclass: High
Capacity of the most limiting layer to transmit water (Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water fable: More than 80 inches
Frequency of flooding: None
F re q u e ncy of ponding: None
Calcium carbonate, maximum content:5 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: Very low (about 2.4 inches)
lnterpretive groups
Land capability classification (irrigated) : None specified
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: D
Hydric so/ rafing: No
Description of Rock Outcrop, Steep
Setting
Landfo rm : Mountainsides
La ndform position (three-dime nsional) : Free face
Down-slope shape; Convex
Across-s/op e shape : Convex
Typical profile
H1 - 0 to 60 inches.' unweathered bedrock
PropeÉies and qualities
S/ope; 15 to 70 percent
Depth to restrictive feature:0 inches to paralithic bedrock
RunorTclass; Very high
Capacity of the most limiting layer to transmit water (Ksat); Very low to moderately
high (0.00 to 0.20 in/hr)
Available water supply, 0 to 60 rnches; Very low (about 0.0 inches)
lnterpretive groups
Land capability classification (irrigated): None specified
13
Custom Soil Resource Report
Land capability classification (nonirrigated): Bs
Hydric sorT rafing; No
14
Soil lnformation for All Uses
Soil Properties and Qualities
The Soil Properties and Qualities section includes various soil properlies and
qualities displayed as thematic maps with a summary table for the soil map units in
the selected area of interest. A single value or rating for each map unit is generated
by aggregating the interpretive ratings of individual map unit components. This
aggregation process is defined for each property or quality.
Soil Erosion Factors
Soil Erosion Factors are soil properties and interpretations used in evaluating the
soil for potential erosion. Example soil erosion factors can include K factor for the
whole soil or on a rock free basis, T facto¡ wind erodibility group and wind erodibility
index.
K Factor, Whole Soil
Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by
water. Factor K is one of six factors used in the Universal Soil Loss Equation
(USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the
average annual rate of soil loss by sheet and rill erosion in tons per acre per year.
The estimates are based primarily on percentage of silt, sand, and organic matter
and on soil structure and saturated hydraulic conductivity (Ksat). Values of K range
from 0.02 to 0.69. Other factors being equal, the higher the value, the more
susceptible the soil is to sheet and rill erosion by water.
"Erosion factor Kw (whole soil)" indicates the erodibílity of the whole soil. The
estimates are modified by the presence of rock fragments.
Factor K does not apply to organic horizons and is not reported for those layers.
15
=ÀF'&B4Wæ5mÆ13¡æ49ææ49€0Æ060æ5130Map Scale: 1:3,030 if printed on A landsope (11" x 8.5') sheet.- ---:Nl€têrS0 40 80 160 240-::::æffi0100N400m¡4ap projectbn: Web Mercator Oomer coodinates: WC,584 Rlge ücs: UTM Zone 13N WG584Custom Soil Resource ReportMap-K Factor, Whole Soilã200æ6,zmæ5340390 33'49 N39" 33',3t'NRagEaüsIaRsaF39Ó 33 49'N390 33 35" NIhRNAÆ2mæ5340&10æ548016
Area of lntergst {AOl)Area of lnterest (AOl)So¡lsSo¡l Rating Polygons.02.05.10. tc.17.20.24.28.32.ôt.43.49.55.b4Not rated or not ava¡lableSoil Rating Lineslt+r .O2,+¡ .05N .10FrF .15,t .17,t .20| , Not rated or not ava¡lableSo¡l Rating Pointsrl .o2I. '05Ir '10@ .1str .17tr .20tr .24tr .28@ '32I .37r .43i, '49rl .55r .64tr Not rated or not availableWater FeaturesMAP INFORMAT¡ONThe soil surveys that comprise your AOI were mapped at1:24,000.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A project¡on that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculat¡ons of distance or area are required.This product is generated from the USDA-NRCS certified dataas of the version date(s) listed below-Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurveyArea Data: Version 14, Sep2,2021Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial ¡mages were photographed: Sep 24,201S-Nov2,2015The orthophoto or other base map on which the soil lines werecomp¡led and digitized probably differs from the backgroundMAP LEGENDCustom Soil Resource ReportStreams and CanalsTransportation¡¡-¡ RailsN lnterstate H¡ghwaysUS Routes'.ìri:: Major RoadsLocal RoadsBackgroundI Aerial Photography.24.28.32.37.43.49#, .ss,*l .64TWEEEEflEE[fmMETnWarning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.17
MAP LEGENDCustom Soil Resource ReportMAP INFORMATIONimagery displayed on these maps. As a result, some minorofunit boundariesbe evident.18
Custom Soil Resource Report
Table-K Factor, Whole Soil
Rating Options-K Factor, Whole Soil
Aggregation Method: Dominant Condition
Aggregation is the process by which a set of component attribute values is reduced
to a single value that represents the map unit as a whole.
A map unit is typically composed of one or more "components". A component is
either some type of soil or some nonsoil entity, e.9., rock outcrop. For the attribute
being aggregated, the first step of the aggregation process is to derive one attribute
value for each of a map unit's components. From this set of component attributes,
the next step of the aggregation process derives a single value that represents the
map unit as a whole. Once a single value for each map unit is derived, a thematic
map for soil map units can be rendered. Aggregation must be done because, on
any soil map, map units are delineated but components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding component
typically makes up approximately 60% of the map unit. Percent composition is a
critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Condition" first groups Iike attribute values for
the components in a map unit. For each group, percent composition is set to the
sum of the percent composition of all components participating in that group. These
groups now represent "conditions" rather than components. The attribute value
associated with the group with the highest cumulative percent composition is
returned. lf more than one group shares the highest cumulative percent
composition, the corresponding "tie-break" rule determines which value should be
returned. The "tie-break" rule indicates whether the lower or higher group value
should be returned in the case of a percent composition tie. The result returned by
this aggregation method represents the dominant condition throughout the map unit
only when no tie has occurred.
Component Percent Cutoff: None Specified
Components whose percent composition is below the cutoff value will not be
considered. lf no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Map unit symbol Map unit name Rating Acres ln AOI Percent of AOI
B Atencio-Azeltine
complex, 1 to 3
percent slopes
'17 13.9 98.2o/o
67 Torriorthents-Rock
outcrop complex,
steep
0.3 1.8o/o
Totals for Area of lnterest 14.1 100.0%
19
Custom Soil Resource Report
Tie-break Ru/e; Higher
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable)
For an attribute of a soil horizon, a depth qualification must be specified. ln most
cases it is probably most appropriate to specify a fixed depth range, either in
centimeters or inches. The Bottom Depth must be greater than the Top Depth, and
the Top Depth can be greater than zero. The choice of "inches" or "centimeters"
only applies to the depth of soil to be evaluated. lt has no influence on the units of
measure the data are presented in.
When "Surface Layer" is specified as the depth qualifie¡ only the surface layer or
horizon is considered when deriving a value for a component, but keep in mind that
the thickness of the surface layer varies from component to component.
When "All Layers" is specified as the depth qualifier, all layers recorded for a
component are considered when deriving the value for that component.
Whenever more than one layer or horizon is considered when deriving a value for a
component, and the attribute being aggregated is a numeric attribute, a weighted
average value is returned, where the weighting factor is the layer or horizon
thickness.
Wind Erodibility Group
A wind erodibility group (WEG) consists of soils that have similar properties
affecting their susceptibility to wind erosion in cultivated areas. The soils assigned
to group I are the most susceptible to wind erosion, and those assigned to group 8
are the least susceptible.
20
&Enæ51Sæ45âæ4W029506ûæ5130Map Scale: 1:3,030 ifpnnted on A landscape (11" x 8.5) slæet240--;;;:-:ffiFed0 100 æ 4m 600Custom Soil Resource ReportMap-Wind E rodibility Groupæ4850Mt0Æ48039 33',49" N39" 33'3f NRI39ô 33 49'N390 33 35" NÊqIaE3IFIaBÐgFasRñaåNA&g0\16080403Map projectiorì: \,4þb Mer(a¡or @r€ræold¡nates: WG584 ftlgetics: UfM Zone 13N WGS8421æ52mÆzmæ5340æÉr'10
Custom Soil Resource ReportMAP LEGENDMAP INFORMATIONThe soil surveys that comprise your AOI were mapped at1:24,000.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurvey Area Data: Version 14, Sep 2,2021Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Sep 24,201S-Nov2,2015The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundArea of lnterest (AOl)tf Area of lnter6st (AOl)SoilsSoil Raüng Polygons12344L567INot rated or not ava¡lableSo¡l Rãt¡ng LinesÆr 'lÃrÉ 2þ,ül 3t, 4*,r./ 4L¡ãa 5-¿, 67#8. ) Not rated or not availableSoil Rating Pointsl1l2E3tr4tr4tI5I6-l 7l8tr Not rated or not availableWater FeaturesStreams and CanalsTransportation¡41 Railsr4.t lnterstateHighwaysffid US Routesiì:::...: Major RoadsLocal RoadsBackgroundI Aer¡al PhotographyImEEnEWMInäiWarning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.22
MAP LEGENDCustom Soil Resource ReportMAP INFORMATIONimagery displayed on these maps- As a result, some minorofunit boundariesbe evident.23
Custom Soil Resource Repoft
Table-Wi nd Erodibility Group
Rating Options-Wind Erodibility Group
Aggregation Method: Dominant Condition
Aggregation is the process by which a set of component attribute values is reduced
to a single value that represents the map unit as a whole.
A map unit is typically composed of one or more "components". A component is
either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute
being aggregated, the first step of the aggregation process is to derive one attribute
value for each of a map unit's components. From this set of component attributes,
the next step of the aggregation process derives a single value that represents the
map unit as a whole. Once a single value for each map unit is derived, a thematic
map for soil map units can be rendered. Aggregation must be done because, on
any soil map, map units are delineated but components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding component
typically makes up approximately 60% of the map unit. Percent composition is a
critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Condition" first groups like attribute values for
the components in a map unit. For each group, percent composition is set to the
sum of the percent composition of all components participating in that group. These
groups now represent "conditions" rather than components. The attribute value
associated with the group with the highest cumulative percent composition is
returned. lf more than one group shares the highest cumulative percent
composition, the corresponding "tie-break" rule determines which value should be
returned. The "tie-break" rule indicates whether the lower or higher group value
should be returned in the case of a percent composition tie. The result returned by
this aggregation method represents the dominant condition throughout the map unit
only when no tie has occurred.
Component Percent Cutoff: None Specified
Components whose percent composition is below the cutoff value will not be
considered. lf no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Map unit symbol Mâp unit name Rating Acres ln AOI Percent of AOI
B Atencio-Azeltine
complex, 1 to 3
percent slopes
3 13.9 98.2o/o
67 Torriorthents-Rock
outcrop complex,
steep
0.3 1 .8o/o
Totals for Area of lnterest 14.1 100.0%
24
Custom Soil Resource Report
Tie-break Ru/e.'Lower
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
Soil Qualities and Features
Soil qualities are behavior and performance attributes that are not directly
measured, but are inferred from observations of dynamic conditions and from soil
properties. Example soil qualities include natural drainage, and frost action. Soil
features are attributes that are not directly part of the soil. Example soil features
include slope and depth to restrictive layer. These features can greatly impact the
use and management of the soil.
Hydrologic Soil Group
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (4, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer at
or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
lf a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
25
BF.æ4øæ(Ðã(E0Æ19t@ Scale: l:3,030'f pdrþd ü A brdupe (11" x 8.5) *ed.lvlæ€0 ¡O æ 160 240Feet0'1æ?ff4@ffiCustom Soil Resource ReportMap-Hydrologic Soil Groupæ29486039Þ 3649 N39p 333SNgag39Þ 349Næp 333f NÊàJIEEßEIåEg=ÞoÈLRNAæ70æ5340æ5410æ{n=À¡4aptro¡¡diIl: \4ëbMer@r ConEr@*lalË: WG684 E€etics: ttnq bE 13{ WGS8426
Custom Soil Resource ReportMAP LEGENDMAP INFORMATIONThe soil surveys that comprise your AOI were mapped at1:24,000.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed belowSoil Survey Area: Rifle Area, Colorado, Parts of Garfìeld andMesa CountiesSurvey Area Data: Version 14, Sep 2,2021Soil map units are labeled (as space allows) for map scales't:50,000 or larger.Date(s) aerial images were photographed: Sep 24, 201S-Nov2,2015The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundArea of lnterest (AOl)if Area of lnterest (Aol)SoilsSo¡l Ret¡ng PolygonsIcI c/DTDtr Not rated or not ava¡lableYllater FeaturesTransportation{-f+ Rails4 lnterstate Highwaysñ UsRoutes:tt..:..: Major RoadsLocal RoadsBackgroundI Aerial PhotographyffimwWEHM!nANDBB/Dcc/DDNot rated or not availableSoil Rating Linesi+/ AÃÉ A/Dt4r B14 B/D-rtl C¡ra C/D¡ryr D| , Not rated or not ava¡lableSoil Rating Po¡ntslAI A/DIBI B/DWarning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.27
MAP LEGENDCustom Soil Resource ReportMAP INFORMATIONimagery displayed on these maps. As a result, some minorofunit boundariesbe evident.28
Custom Soil Resource Report
Table-Hydrologic Soil Grou p
Rating Options-Hydrologic Soil Group
Aggregation Method: Dominant Condition
Aggregation is the process by which a set of component attribute values is reduced
to a single value that represents the map unit as a whole.
A map unit is typically composed of one or more "components". A component is
either some type of soil or some nonsoil entity, e.9., rock outcrop. For the attribute
being aggregated, the first step of the aggregation process is to derive one attribute
value for each of a map unit's components. From this set of component attributes,
the next step of the aggregation process derives a single value that represents the
map unit as a whole. Once a single value for each map unit is derived, a thematic
map for soil map units can be rendered. Aggregation must be done because, on
any soil map, map units are delineated but components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding component
typically makes up approximately 60% of the map unit. Percent composition is a
critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Condition" first groups like attribute values for
the components in a map unit. For each group, percent composition is set to the
sum of the percent composition of all components participating in that group. These
groups now represent "conditions" rather than components. The attribute value
associated with the group with the highest cumulative percent composition is
returned. lf more than one group shares the highest cumulative percent
composition, the corresponding "tie-break" rule determines which value should be
returned. The "tie-break" rule indicates whether the lower or higher group value
should be returned in the case of a percent composition tie. The result returned by
this aggregation method represents the dominant condition throughout the map unit
only when no tie has occurred.
Component Percent Cutoff: None Specified
Components whose percent composition is below the cutoff value will not be
considered. lf no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Map unit s¡mbol Map unit name Rating Acres ln AOI Percent of AOI
I Atencio-Azeltine
complex, 1 to 3
percent slopes
B 13.9 98.2%
67 Torriorthents-Rock
outcrop complex,
steep
D 0.3 1 .Bo/o
Totals for Area of lnterest 14.1 100.0%
29
Custom Soil Resource Report
Tie-break Ru/e; Higher
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
30
References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18,2002. Hydric soils of the United States.
Hurt, G.W, and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
SoilSurvey Division Staff. 1993. Soilsurvey manual. SoilConservation Service.
U. S. Department of Ag ricu ltu re Hand book 1 8. http://www. n rcs. usda. gov/wps/portal/
nrcs/detail/national/soils/?cid=n rcs I 4 2p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soilsurveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Ag ricu ltu re, Natu ra I Resou rces Conservation Service. http ://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580
Tine¡ R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987 . Corps of
Engineers wetlands delineation manual. Watenvays Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
h o me/?cid = n r cs1 42p2 _05337 4
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/
detai l/national/land use/ra ngepastu rel?cid=stel prd b 1 043084
31
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soilsurvey handbook, title 430-Vl. http://www.nrcs.usda.gov/wps/portal/
n rcs/detail/soi ls/scientists/?cid =nrcs 1 42p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?
cid=nrcs142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http:ll
www.nrcs. usda. gov/l nterneUFSE_DOCU MENTS/n rcsl 42p2_052290.pdf
32
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