HomeMy WebLinkAbout1.19 Storm water mgmt planStorm Water Management Plan
for
Skinner Ridge Field Permit
Piceance Basin Natural Gas Development Program
Garfield County, Colorado
September 2005
Revised June , Darker 2000, August 2007
fie yard: tognsl 1000
Prepared for:
Chevron U.S.A. Inc
760 Horizon Drive
Grand Junction, CO 81506
Prepared $v:
./e°
CORDILLERAN
Cordilleras Compliance Services, Inc
826 21 /, Road
Grand Junction, CO 81506
dugusi 2008 additions hv:
Washington Group International
Integrated Engionling, Gonswenon. and Manegetnent Solution.
7800 E. Union Ave., Suite 100
Denver, CO 80237
Slower RidgoiStormwater(SW Addinans RevisionsIAogess 2006 SWMIP Revisions
Spinner Ridce Master SWMP
Table of Contents
Chevron U.S.A., Inc.
1.0 INTRODUCTION »» »...» ...» ...I
1.1 Storm Water Runoff Permitting Requirements 1
1.2 Project Description and Background 2
13 Project Owner and Operator 3
2.0 CONSTRUCTION SITE DESCRIPTION...». ..4
2.1 Site Location and Construction Area Description 4
2.2 Vegetative Communities 6
2.3 Regional Climate 6
24 Regional Surface Water Classification 717
3.0 Schedule of Construction Activities.....
8
3.1 Development (Construction/Drilling/Completion) . 8
3.1.1 Well Pad Development 8
3.1.2 Pipeline Development 9
3.1.3 Road Development 10
3.1.4 Facilities Development 13
3.2 Production (Operation/Maintenance)and Interim Reclamation 14
3.2.1 Wcll Pad Production Activities and Interim Reclamation 14
3.2.2 Pipeline Completion and Interim Reclamation 15
3.2.3 Road Completion and Interim Reclamation 16
3.2.4 Facilities Production Activities and Interim Reclamation 16
3.3 Final Reclamation 17
3.3.1 Well Pads Final Reclamation. 17
3.3.2 Pipeline Final Reclamation 17
3.3.3 Roads Final Reclamation.. 17
3,3.4 Facilities - Final Reclamation. 18
4.0 Potential Pollution Sources
5.0 Description of Control Measures
5.1 Soil Erosion and Sediment Controls
5.2 Storm Water Management Controls
5.3 Other Controls
5.4 Construction Site Housekeeping
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20
25
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Skinner Ridge Master SWMP Chevron U.S.AInc.
6.0 INSPECTION AND MAINTENANCE PROCEDURES 29
7.0 NON - STORMWATER DISCHARGES 31
8.0 FINAL STABILIZATION 32
LIST OF TABLES
Table 1
Table 2
Skinner Ridge Vegetation Descriptions
Skinner Ridge Final Stabilization Seed Mixtures
LIST OF FIGURES
Figure 1
Figure 2
Skinner Ridge Location
BMP Selection and Construction Phase Guidelines
LIST OF APPENDICES
Appendix A Skinner Ridge Common Plan of Development Storm Water Permit
Appendix B List of Down -Hole Chemicals
Appendix C Typical Storm Water BMP Details
Appendix D Storm Water Inspection Form
Appendix E Compliance Updates
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Skinner Ridge Master SWMP Chevron U.S.A., lne.
1.0 INTRODUCTION
This Stormwater Management Plan (SWMP) is written to comply with the Colorado
Department of Public Health and Environment's (CDPHE) General Permit No. COR-
03000 issued on July 1, 2007 and expiring on June 30, 2012, and related U.S.
Environmental Protection Agency (USEPA) National Pollutant Discharge Elimination
System (NPDES) stormwater regulations. Chevron's permit renewal approval is
provided in Appendix A.
Construction permits are required for oil and gas activities that disturb 1 or more acres
during the life of the project or are part of a larger common plan of development.
CDPHE added another option for permits in its Stormwater Fact Sheet — Construction at
011 and Gas Facilities (revised in July 2007): the Field Permit certification. In this
document, CDPHE recommended that oil and gas developments be covered under a Field
Permit certification. The Field Permit covers all construction activities and discharges to
all creeks listed in the permit for the entire project area. Chevron has amended its
original permit renewal application to be covered under a Field Permit rather than a
common plan of development, as originally submitted.
This Master SWMP provides information, procedures, and best management practices
(BMPs) that will be used across the project area for construction activities associated
with development of the natural gas resources in the Skinner Ridge Field. This SWMP
will be updated as necessary to address planned developments, new disturbances, and
other changes needed to manage stormwater and protect surface water quality. Site -
specific SWMP site maps, based on controls and procedures sununarized in the Master
SWMP, will be prepared for each facility /construction project and provided as
appendices to this plan.
1.1 Storm Water Runoff Permitting Requirements
The Federal Clean Water Act [Section 402(p)] requires that discharges of pollutants to
waters of the United States from any point source be regulated by NPDES permits. In
November 1990 the USEPA published final regulations that established application
requirements for storm water associated with construction activity for soil disturbances of
5 acres or more be regulated as an industrial activity and covered by an NPDES pcmtit.
In December 1999 the USEPA published final Phase II NPDES regulations that
established application requirements for stormwater associated with construction activity
for soil disturbances to be regulated as an industrial activity and covered by an NPDES
permit. These regulations became effective July I, 2002,
On June 30, 2005, the State of Colorado stormwater regulation went into effect to require
Colorado Discharge Permit System (CDPS) permits from the Water Quality Control
Division (the Division) for stormwater discharges from construction activities associated
with small construction activity for ail and gas sites (those that disturb between one and
five acres). Permitting for oil and gas construction sites that disturb five or more acres
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Skinner Ridge Master SWMP Chevron U.S.A., Inc.
during the life of the project, or are part of a larger common plan of development, has
been required since 1992. Although federal permit coverage for these discharges was
conditionally exempted from the Federal Clean Water Act by the 2005 Federal Energy
Bill, the Colorado Water Quality Control Commission has maintained the requirement
within Colorado's regulations, and therefore permit coverage for these activities remains
in effect in Colorado. These requirements are in addition to the requirements of the
Colorado Oil and Gas Conservation Commission (COGCC).
1.2 Project Description and Background
The Skinner Ridge Field is be located in Garfield County, Colorado within Townships 5,
6, 7, 8 and 9 South, Ranges 97 and 98 West (Figure 1). The town of Debeque, Colorado
is the nearest population center; it is approximately 14 miles south of the Skinner Ridge
Field. Chevron is developing about 33,000 acres in the Piceance basin. The Program
anticipates drilling about 2,800 wells over a 14 year period. Design life of the field is
projected at 30 years.
Field gathering lines collect production fluids from the well pads and transport the full
well stream (FWS) to the Production Cluster Pads (PCP) for initial natural gas separation.
Discharge lines from the joint trunk lines flow to a Central Production Facility (CPF)
(multiple production facilities will be required for the Program). At the production
facilities, the natural gas and liquids are further separated. The natural gas is compressed,
dehydrated and sent to a sales point through a recently constructed 30 -inch export gas
pipeline. Hydrocarbon condensate will be stabilized and stored in holding tanks for
transport to processing facilities via tanker truck. Over the next two years, much of the
produced water will be used for hydraulic fracturing operations or disposed of in an on-
site permitted injection well. In 2010 a water treatment plant is expected to begin
operating and remove salts and any remaining hydrocarbons. The treated water will be
used for drilling operations and potentially as a potable water supply. Brine and solids are
anticipated waste streams from this process. Current plans are to use permitted disposal
injection wells for the brine and to transport the solids to a permitted waste disposal
facility.
The current drilling and development plan includes well pad construction, well drilling,
completion and testing, access road improvement/construction, support facility
construction (production facilities, offices, water treatment facilities, etc.), utility
installation, and pipeline construction. The area of estimated disturbance, including the
natural gas well pads, the access roads, and gathering system pipeline, will exceed 370
acres. Disturbance beyond five years will require re- evaluation. Figure 1 shows some of
the well pads and facilities associated with the early phases of the Program.
Skinner Ridge Master SWMP Chevron U.S.A., lee.
13 Project Owner and Operator
The property owner and operator is Chevron U.S.A., Inc. Their address is:
Chevron U.S.A. Inc.
760 Horizon Drive
Grand Junction, CO 81506
The Chevron contact person for the project is:
Michael DeBerry
Manager, Piceance Basin Operations
760 Horizon Drive
Grand Junction, CO 81506
Oftice: 970-257-6005.
Cell: 307 - 679 -4050
SWMP Administrator(s): Richard Carroll
Environmental Specialist, Piceance Basin Operations
Chevron MCA
Office: 970 - 257 -6026
Chevron will be in charge of all aspects of this project. Contractor(s) will be employed
for construction, drilling, and construction management, but all work will be supervised
by Chevron and all decisions will be made by Chevron.
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2.0 CONSTRUCTION SITE DESCRIPTION
2.1 Site Location and Construction Area Description
According to the Natural Resource Conservation Service (MRCS) Soil Survey Map of the
Douglas Plateau Area, Colorado,
Paris of Garfield and Mesa
Counties, the subject area is located
within the Piceance Basin on the
eastem fringe of the Colorado
Plateau. It includes the Roan
Plateau, Bookcliffs, and is adjacent
to portions of the Grand Mesa and
Grand Valley areas. It consists or
deeply incised valleys, entrenched
plateaus, and foothills. The broader
portion of the valley is carved out by
the Colorado River and its
tributaries.
The development site elevation ranges from a valley floor elevation of 5,800 feet to a
height of 8,500 feet at the Roan Plateau. The Roan Plateau extends north into Rio Blanco
County. and surrounds the Skinner Ridge property.
The shallowest stratigraphic trait in the Piceance Basin is the Uinta Formation, which
consists of discontinuous layers of silty sandstone, siltstone and marlstone deposits. The
Uinta Formation overlies the Green River Formation, which contains vast deposits of oil
shale.
The Wasatch, Lower Fort Union and Mesaverde Formations underlie the Green River
Formation, and consist of sandstones, mudstones, and coal. These formations represent
the major gas producing formations of the Piceance Basin. The natural gas occurs as
non - conventional gas at the Skinner Ridge development site.
Surface and groundwater features are located within the upper reaches of the Clear and
Roan Creeks, where the Program area lies. These features consist of ephemeral streams
fed by seasonal rainfall and snowmclt. Springs and seeps are also observed throughout
the area. One seep in particular, was harnessed with a cistern and used for habitation of a
historical site near the confluence of Tom Creek and Clear Creek.
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Skinner Ridge Master SWMP
Most of the geological material underlying
the Skinner Ridge property is impervious to
water. Except for the alluvium within the
major svcambeds, there is no known
extensive aquifer. The alluvial aquifer
consists of narrow and relatively thin sand
and gravel deposits adjacent to and beneath
Clear Creek.
In the northern portion of the development
site, the alluvial aquifer is underlain by the
confining unit below the Lower Piceance
Basin aquifer (Douglas Creek Member of the
Green River Formation), which consists of
fine - grained sandstone, limestone and shale.
And. in the southern portion of the site, the
alluvial aquifer is underlain by the Wasatch Formation, which consists of sandstone and
shale. The Roan Plateau is underlain by the Upper Ficeancc Basin aquifer (Uinta
Formation), which consists of silty sandstone and fractured siltstonc.
Chevron C.S..t -. Inc-
Developed Spring at the Continence of Tom and
Clear Creek%
The hydraulic gradient in the bedrock aquifers underlying the Roan Plato. is
predominately vertical and downward. However, along the margins of the plateau there
are strong horisntal hydraulic gradients flowing toward the cliff faces and valley slopes.
Because of these strong horizontal gradients. ground water is discharged from the
bedrock aquifers as springs even though the bedrock aquifers dip away from valley
slopes. Numerous seeps and springs are present along the valley slopes above Clear
Creek and a large seep is present on the valley slope above Tom Creek.
Detailed soil information was collected as part of Chevron's internal Environmental,
Social and Health Impart Assessment (ESHIA) (ERM, 2008). Three main groups of soils
are present within the Program area: (1) soils along drainages, (2) soils along side slopes,
and (3) soils atop plateaus (also referred to as mesas).
The soils along the drainages occur on benches. terraces, alluvial fans. and tloodplains in
the valleys of Roan Creek, Clear Creek, and their tributaries. These soils are deep, well to
somewhat poorly drained, and nearly level to gently sloping, with water erosion hazard
ranges from slight to severe. The soils found along the drainages include soils that are
classified as prime farmland.
The soils along the side slopes of Skinner Ridge, Puddin Ridge, and other slopes along
the mesa and other mountain slopes, are dominated by shallow, poorly developed soils
and rock outcrops. These soils have a severe erosion potential and some have very steep
slopes that limit their potential for construction and re- vegetation.
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Skinnier Ridge Master SWMP Chevron U.S.A., Inc.
The soils on the plateaus and mesa tops are mostly well- drained, cool soils, with dark -
colored, organic-rich surface layers. These soils have a slight to severe erosion potential.
In areas that are disturbed by construction, soil materials will be managed so that erosion
and sediment transport are minimized. Nearby drainages will be protected by appropriate
measures. The road will be graded and sloped to drain into roadside ditches and to direct
runoff from adjacent slopes away from the road surface. The development consists of the
construction of roads, pipelines, drilling pads and gas treatment facilities. The
construction of the facilities in the development area will be done using conventional cut
and fill, trenching and earth moving techniques.
2.2 Vegetative Communities
The eleven vegetation communities that were found in the Program area are listed below.
The vegetation communities in the Program area reflect the wide ranges of elevation.
topography, aspect, and moisture. Aspen forests, deciduous oak shrublands, Douglas fir
forests, mesic upland shrub communities, and mountain sagebrush
shrublands are common in the
higher elevations of the
Piceancc area Big sagebrush
shrublands, riparian areas, and
irrigated cropland are present
in the deep valleys. Juniper
woodland forests, grcasewood
flats, and desert shrub
communities are common on
the exposed steep slopes, in
dryer areas, and on shale
plateaus. Vegetation
communities have developed
across the landscape in response to climate, disturbance, and other environmental factors.
Vegetation Community Type
Percent of Study
Area
Aspen forest
4.0
Big sagebrush
2.6
Desert shrub
12
Douglas fir forest land
62
Exposed rock
1.0
Forest - dominated riparian
1.1
Greasewond fans and flats
13
irrigated cropland
7.6 _ _
Juniper woodland forest land
5.2
Manic upland shrub
22.2
Mountain sagebrush
46.7
Additional information about vegetation communities associated with the various soil
types is presented in Table 1. Identification of the vegetative community to be disturbed
is very important, because some types are more sensitive to disturbance, while others are
far more resilient.
2.3 Regional Climate
Climate information was collected as part of the ESHIA study. The ESHIA report
describes the general climate of the study arca as influenced by dry air, sunny days, clear
nights, variable precipitation, with moderate evaporation and large diurnal temperature
changes. These are generally due to changes in topography between the valleys and
mesas.
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Skinner Ridge Master SWMP Chevron U.S.A., lee.
Annual precipitation ranges from about 10 to 20 inches. Seasonal and daily temperatures
vary with elevation and, to a lesser extent, local microclimates. Daily temperatures. in
degrees Fahrenheit, in the summer usually range from the upper 40s to the lower SOs in
mountain terrains, and mid 90s in the western valleys. In the winter, cold air commonly
accumulates in the valleys. Prevailing winds in the upper levels of the atmosphere are
mostly from the southwest, but local air movements arc strongly influenced by
topography including elevated mesas. steep slopes, narrow canyons and rough terrain in
the Study Area.
2.4 Regional Surface Water Classifications
The initial Program area lies in the Roan Creek watershed. which includes Clear Creek
and its tributaries, with future development in the Parachute Creek watershed. Under the
Colorado Water Quality Control Commission, Regulation 37, Regulations for the Lower
Colorado Basin, these are named Segments 14a and 14b of the Lower Colorado River
Basin and Sub - basin. Segment 14a includes the main stem of Roan Crcck including all
wetlands and tributaries. from the source to a point immediately above the confluence
with Clear Creek (except for a listing in Segment 14b); Clear Creek, including all
tributaries and wetlands, from the source to a point immediately below the confluence of
Tom Creek. Segment 14b consists of Clear Creek. including all tributari es and wetlands,
from a point immediately below the confluence with Tom Creek to the confluence with
Roan Creek; Roan Creek, including all tributaries and wetlands, from a point
immediately above the confluence with Clear Creek to a point immediately below the
confluence with Kimball Creek.
Segment 14a is designated as reviewable and its classified beneficial uses are: aquatic fife
class one cold, recreation P (primary contact), water supply, and agriculture (irrigation
and cattle grazing). At a recent rulemaking hearing (June 2008), the Division indicated
that this segment warranted a cold
temperature standard tier I, due to the
presence of brook and cutthroat trout_
This is indicative of a sensitive habitat
that should utilize greater protection
when considering disturbance and proper
selection of stabilization and erosion
controls [typically referred to as Best
Management Practices (BMPs)].
Segment 14b has the same designation
and classified use; however. it has a cold
temperature standard tier Il, for the
presence of rainbow and brown trout,
mottled sculpin, mountain whitefish, longnose sucker, and Arctic grayling. Again these
designations are indicative of a sensitive habitat warranting greater protection when
considering disturbance proper selection of BMPs.
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Skinner Ridge Master SWMP Chevron USA., Inc.
3.0 Schedule of Construction Activities
As mentioned in Section 1.2 the development of the Program will involve multiple
construction activities including well pad construction, well drilling, completion and
testing, access road improvement/construction, support facility construction (production
facilities, offices, water treatment facilities, etc.), utility installation, and pipeline
construction.
The development of natural gas facilities is generally accomplished in three distinct work
phases. The first phase is Development (Construction/Drilling /Completion), the second
phase is Production (Operation/Maintenance), and the third phase is Final Reclamation.
3.1 Development ( Construction /Drilling/Completion)
3.1.1 Well Pad Development
The well pad development phase includes the following activities: pad construction, well
drilling, well completion, gas line installation, and pad area reclamation. Pad reclamation
is accomplished by backfilling the reserve pit, contouring disturbed soils to conform with
the surrounding terrain, replacing the stockpiled top soil, seeding of disturbed soil areas
in order to re- establish a cover vegetation, and construction of erosion and sediment
control structures. The completion of the wells and resulting beginning of gas
production, generally triggers a one -year time period in which the reclamation phase of
work should be completed. The final stabilization seed mixture for locations above and
below 7,000 feet is provided in a re- vegetation specification provided in Table 2.
During the initial stages of the well pad construction, heavy equipment will be used to
shape and contour the site and any access roads. Design and construction techniques and
other practices are to be employed to minimize surface disturbance and the associated
effects of proposed operations and maintain the reclamation potential of the site. A
typical well pad will be approximately 200 feet by 400 feet, though dimensions may vary
due to topography and production.
Because of the location of the project, steep slopes are expected to be encountered at
many of the projected well pad sites. Many of the sites will require vertical cuts and
steep fill slopes. Steps will be taken to avoid or mitigate construction in riparian areas
and other areas deemed as areas subject to severe erosion. The well site will also be
reviewed to determine its effect on the location of the access road.
Construction procedures will be implemented that minimize surface disturbance. All
topsoil is to be removed from the entire cut and fill area and stored in a designated
stockpile for reuse during interim and final reclamation. Topsoil must be segregated and
stored separately from subsurface materials to avoid mixing during construction, storage,
and interim reclamation. Stockpiles will be properly located and protected so minimize
wind and water erosion and maximize available topsoil for reclamation.
Skinner Ridge Master SWMP Chevron USA., Inc.
Excavation of the cut and fill slopes is normally guided by information on the slope
stakes. Fills should be compacted to minimize the chance of slope failure. if excess cut
material exists after fill areas have been brought to grade, the excess material will be
stockpiled at approved locations.
The area of the well pad where the drilling rig substructure is located should be Level and
capable of supporting the rig. The area to be used for mud tanks, mud storage, drilling
chemicals, and fuel tanks should be at a slight slope, where possible, or a suitable
alternative such as ditching should be used to provide drainage from the work area to a
reserve pit.
To reduce erosion and soil loss, it may be appropriate to divert storm water away from
well locations with ditches, berms, or waterbars above the cut slopes and to trap well
location runoff and sediments on or near the Location through use of sediment controls.
Sediment controls will dominate this early phase of construction. Temporary BMPs such
as silt fences, waddles, and other erosion/sediment controls will be used in the initial
stages to provide perimeter sediment runoff control. As the construction work progresses
and the contour of the site are completed, more permanent structural and non - structural
BMPs will be implemented. The focus in these later changes will be on implementing
effective erosion controls and in attempting to re- vegetate disturbed areas with native
grass seed mix. A summary of the primary Program BMPs is provided in Appendix C.
The attachment includes information on BMPs, including where and when to use them,
their limitations, along with construction details and maintenance requirements.
A site specific SWMP map will be developed for each well pad as part of the engineering
design and provided as an attachment to this plan.
3.1.2 Pipeline Development
Steep hillsides and water courses should be avoided when locating pipeline routes. When
clearing, the width disturbed should be kept to a minimum. During the excavation phase,
designated topsoil stockpiles must be established to the side of the pipeline construction
routes. Topsoil material must be segregated and not be mixed or covered with subsurface
material. Bladed materials must be placed back into the cleared route upon completion of
construction and returned back to the original contour before reapplying topsoil.
Pipeline trenches should be compacted during backfilling. After construction, cut -and-
fill slopes must be re- graded to conform to the adjacent terrain and reclaimed. Pipeline
right -of -way must be maintained in order to correct backfill settling and prevent erosion.
Appropriate BMPs must be used in sensitive areas to ensure proper site stabilization. Site
specific SWMP maps for each pipeline corridor will be developed as part of the
engineering design and provided as an attachment to this plan.
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Skinner Ridge Mnater SWMP Chevron U.S.A., Inc.
Pipeline construction should not block, dam, or change the natural course of any
drainage. Suspended pipelines should provide adequate clearance for high -flow events.
Pipelines buried across stream crossings should be buried below the scouring depth.
Pipelines crossing streams or wetlands will require a U.S. Army Corp of Engineers
(USAGE) Nationwide or Individual (developed for the entire Program) permit. This
requirement may be avoided by boring under these areas.
3.13 Road Development
Roads used to access oil and gas locations are rarely permanent and exist only as long as
necessary to complete exploration and production operations.
Things to consider when constructing a road:
• Road width, maximum grade, and crown design.
• Location of turnouts.
• Plans for soils, hydrology, and topography — dependant drainage, including
ditches and locations and sizes of culverts and bridges.
• On and off -site erosion control.
• Plans for revegetation of disturbed areas.
• Fence cuts and cattle guards.
• Major cuts and fill.
• Source and storage sites for topsoil.
• Plans for maintaining roads.
All roads must be designed, constructed, and maintained in a safe and environmentally
responsible manner. Roads have the potential to cause environmental harm through
erosion, air pollution, stream degradation, habitat alteration, and increased public use.
Careful attention to the proposed road location and design can significantly minimize
environmental impacts.
When selecting a location for new roads, consider following topographic contours.
Following natural contours preserves natural drainage patterns and typically results in
lower costs and less impact on the environment.
Initial steps in road location include:
• Determine the intended use of the road including seasonal use, type of vehicles to
be used, and amount of traffic, and safety.
Examine biological, physical, and cultural conditions of the area.
• Consider geotechnical factors including soil type, construction / reclamation
limits, landslide areas, water problem areas, etc.
Basic Design Requirements:
• Design for pre- determined speed limit.
• Typically width is 24 feet with turnouts in areas where width is less than 16 feet.
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• Road gradient has major impact on erosion and visual impact. Follow natural
terrain as closely as possible. If terrain allows, gradient should not exceed 8
percent except for short distances of 300 feet or less.
• Drainage control must be ensured over the entire road through the use of drainage
dips, in sloping, natural rolling topography, ditch turnouts, ditches, or culverts.
Ditches and culverts may be required in some situations depending on grades,
soils, and local hydrology. If culverts or drainage crossings are needed, they
should be designed for a 25 year or greater storm frequency.
• Gravel may be needed for "soft" road sections, steep grades, highly erosive soils,
and clay spoils.
• Culverts should be designed for 25 year (one -hour duration) storm frequency with
an allowable head that does not overlap the roadway. The minimum size culvert
diameter is 18 inches.
Construction:
• Excavation and fill construction will be performed to secure the greatest
practicable degree of roadbed compaction and stability.
• Use of excess excavation material, where practical, shall be practiced to improve
the road grade or to flatten fill.
• Roadbed materials shall be placed parallel to the axis of the roadway in even,
continuous horizontal layers.
Surface and Drainage Structures:
• The proper design and construction of structures for the surface drainage of water
from or through the roadway contributes the most to the long -term success of the
road and structure, and minimizes maintenance and adverse environmental effects
such as sediment erosion and sediment production. It is vitally important to keep
water off the road. Surface drainage provides for the interception, collection, and
removal of water from the surface of roads and sloped areas. The design may
need to allow for debris passage, mud flows, and water heavily laden with silt,
sand, and gravel.
• The need for drainage structures can be minimized by proper road location.
However, properly designed drainage is essential for a stable road. Drainage
system must include the best combination of various design elements, such as
ditches, culverts, drainage dips, crown, in -slope or out - slope, low water crossings,
subsurface drains, and bridges.
• Drainage Structures — Proper location and design can provide economical and
efficient drainage. Structural measures are often required to ensure proper and
adequate drainage. Some of the most common structures are drainage dips,
ditches, road crowning, culverts, bridges, and low water crossings.
o Drainage Dips — The primary purpose of a drainage dip is to intercept and
remove surface water from the roadway and shoulders before the
combination before the combination of water volume and velocity begins
to erode the surface materials. Spacing of drainage dips depends upon
local conditions such as soil material, grade, and topography.
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Skinner Ridge Master SWMP Chevron U.S.A., Inc.
o Ditches - The design of ditches must consider the resource objectives for
soil, water, maintenance capabilities and associated costs. Ditch grades
should be no less than 0.5 percent to allow for positive drainage and avoid
sedimentation.
o Road Crowning — Crowning provides good drainage of water from the
surface of the road. Drainage of the inside ditch and side hill runoff is
essential if the road is to be kept dry and passable during wet weather.
o Culverts— Culverts are used in two applications: (1) to allow the normal
drainage from streams and gullies to flow under the roadway and (2) to
drain inside road ditches. All culverts should be laid on natural ground or
at the original elevation of any drainage crossed, except as noted below for
ditch relief culverts.
Culvert diameter design criteria should be a minimum of 18 inches. A hydrological
hydraulic analysis should be performed to determine the amount of water anticipated to
flow through the culvert. Analytical factors that must be considered include the
delineation of the drainage basin, soil types, drainage area slopes, and at a minimum a 25-
year (one -hour duration) precipitation event.
The outlet for all culverts should extend at least one foot beyond the toe of any slope. It
may be necessary to install rip-rap or other energy dissipation devices at the outlet end of
the culverts to prevent soil erosion and trap sediment.
All culverts used in the construction of access roads should be concrete or corrugated
metal pipe (made of steel). Properly bedded and backfilled corrugated plastic pipe may
be used for secondary drainage but should not be used as part of any roadbed.
Evacuation, bedding, and backfilling of culverts should be conducted according to
Program specifications.
Ditch relief culverts are installed to periodically relieve the ditch line flow by piping
water to the opposite side of the road where the flow can be dissipated away from the
roadway. The spacing of ditch relief culverts is dependant on the road gradient, soil
types, and runoff characteristics. The depth of culvert burial must be sufficient to ensure
the culvert is protected for its design life. This requires anticipating the amount of
material that may be lost due to road use and erosion. The culvert gradient should be
greater than the approach stream or ditch gradient. This improves the flow hydraulics
and reduces sedimentation and debris plugging at the culvert inlet.
Additional factors to consider for construction activities involving drainage channels:
Bridges and Major Culverts:
• Construction of some stream crossings may require a USACE Nationwide (404)
or Individual Permit. Where a road is open to public travel, applications will be
prepared and submitted with sufficient time allowed for any required public
comment input periods and approval of the permit by the surface management
agency.
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Skinner Ridge Master SWMP Chevron U.S.A., Inc.
Wetlands:
Wetlands are especially sensitive areas and should be avoided, if possible.
Generally, these areas require crossings that prevent unnatural fluctuations in
water level. Under wetland circumstances, culverts should be designed with a flat
grade so water can flow either direction and maintain its natural level on both
sides. Special attention should be given to selection of culvert materials that will
resist corrosion.
Low Water Crossings:
• Roads may cross small drainages and intermittent streams where culverts and
bridges are unnecessary. The crossing can be effectively accomplished by
dipping the road down to the bed of the drainage. The construction of gravel, rip -
rap, or concrete bottoms may be required. In no case should the drainage be filled
so that water will be impounded. Low water crossings that are not surfaced
should not be used in wet conditions.
Appropriate BMPs must be used in sensitive areas to ensure proper site stabilization. Site
specific SWMP maps for all road construction or improvements will be developed as part
of the engineering design and provided as an attachment to this plan.
3.1.4 Facilities Development
The category of Facilities is intended to capture all projects constructed in a supporting
role to the production facilities previously described. Program facilities will include
offices, maintenance facilities, water storage and treatment facilities, compressor stations,
man camps, and communication towers. A site specific SWMP map for each facility will
be developed as part of the engineering design and provided as an attachment to this plan.
As many of these facilities may be "one of a kind ", more detailed information may be
provided to address specific site conditions and construction activities.
During the initial stages of construction, heavy equipment will be used to shape and
contour the construction site and any access roads. Design and construction techniques
and other practices are to be employed to minimize surface disturbance and the
associated effects of proposed operations and maintain the reclamation potential of the
site. Steps will be taken to avoid or mitigate construction on steep slopes, riparian areas
and other areas deemed as areas subject to severe erosion.
Construction procedures will seek to minimize surface disturbance. All topsoil, when
practical, is to be removed from the entire cut and fill area and stored in a designated
stockpile for reuse during interim and final reclamation. Topsoil must be segregated and
stored separately from subsurface materials to avoid mixing during construction, storage,
and interim reclamation. Stockpiles should be properly located and protected so
minimize wind and water erosion and maximize available topsoil for reclamation.
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Skinner Ridge Master SWMP Chevron USA, lac.
To reduce erosion and soil loss, it may be appropriate to divert stonnwater away from
facility construction sites with ditches, berms, or waterbars above the cut slopes and to
trap well location runoff and sediments on or near the location through use of sediment
controls.
Sediment controls will dominate this early phase of construction. Temporary BMPs such
as silt fences, waddles, and erosion controls will be used in the initial stages to provide
perimeter sediment runoff control. As the construction work progresses and the contour
of the site are completed, more permanent structural and non-structural BMPs will be
implemented. The focus in these later changes will be on implementing effective erosion
controls and in attempting to re- vegetate disturbed areas with native grass seed mix. A
summary of the primary Program BMPs is provided in Appendix C. The attachment
includes information on BMPs, including where and when to use them, their limitations,
along with construction details and maintenance requirements.
3.2 Production (Operation/Maintenance) and Interim Reclamation
The production phase follows the development phase and includes the operation and
maintenance activities that will be conducted during natural gas production. The typical
equipment on a pad during the production phase consists of a wellhead, a separation unit,
from one to several 400 - barrel capacity aboveground tanks for condensate, and an above
ground tank for storing produced water. Gas pipelines are also installed during this phase
of work.
Reclamation activities during this phase include maintenance of revegetated areas and
maintenance of the erosion and sediment control structures. Natural gas wells in the
Skinner Ridge area are projected to produce for approximately 20 to 30 years.
3.2.1 Well Pads Production Activities and Reclamation
Once the well pad site is constructed, drilling operations will begin. Depending on the
number of wells to be completed and the local conditions encountered, drilling operations
at a specific well pad may take six to nine months to complete. Each pad will have
reserve pit(s) to handle and contain drilling fluids and cuttings.
As part of drilling operations, chemicals used in drilling operations will be stored onsite.
A comprehensive list of chemicals that will be used at well pads is provided as an
attachment to this plan. Petroleum products also may be present at the well pads,
including gasoline, diesel fuel, lubricant oils, hydraulic oils, used oils, and solvents.
Ditches will be placed around chemical storage areas to capture and direct any spills to a
well cellar. Well pad drainage is designed to flow to the reserve pits in the event of a
large spill or release. Drip pans will be utilized if necessary. All wastes will be placed
and stored in the proper receptacles prior to removal for off -site disposal. All storage of
petroleum products will be in accordance with the Piceance Basin Field Spill Prevention
Control and Countermeasures (SPCC) Plan.
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Skinner Riders Master SWMP Chevron U.S.A., Inc.
Housekeeping will be maintained in all chemical storage areas. All containers are to
remain closed except when adding or removing materials. Where appropriate, materials
will be stored in locations to prevent containers from being exposed to precipitation
events. Inspection of chemical storage areas will be included as part of the SWMP
inspection program.
The production phase includes the operation and maintenance activities associated with
natural gas production. Typical well pad equipment includes a wellhead, a separation
unit and one or more 400 barrel capacity above ground storage tank(s) containing
condensate and or produced water. Secondary containment will be provided around
chemical storage areas including condensate tanks and separators. Reclamation activities
during this phase include maintenance of re- vegetated areas and maintenance of the
erosion and sediment controls structures.
Installation, inspection and maintenance of BMPs to control sediment runoff will
continue as needed. New BMPs will be installed and maintained as required.
Once drilling operations have been completed and prior to beginning production, parts of
the well pad will be reclaimed. Initial pad reclamation is accomplished by backfilling the
reserve pit, contouring the disturbed soils to conform to the surrounding terrain, replacing
stockpiled top soil, seeding of disturbed soil areas in order to reestablish a cover
vegetation, and construction of erosion and sediment control structures. Oil and gas sites
are considered stabilized once site preparation and interim reclamation are complete, and
the above final stabilization criteria have been met, even though the site will be disturbed
again in the future for final reclamation.
Interim reclamation consists of minimizing the footprint of disturbance by reclaiming all
portions of the well site not needed for production operations. The portions of the well
site not needed for operations and safety purposes will be re- graded to a final or
intermediate contour that blends with the surrounding topography as much as possible.
Topsoil will be re -spread over areas not needed for all weather purposes.
"Final stabilization" means that all ground surface disturbing activities at the site have
been completed, and all disturbed areas have been either built on, paved, or a uniform
vegetative cover has been established with an individual plant density of at least 70
percent of per - disturbance levels.
3.2.2 Pipeline Completion and Reclamation
Pipeline route reclamation involves placing fill in trenches, compacting fill, re- grading
cut and fill slopes to restore the original contours, replacing topsoil, installing temporary
waterbars and silt fencing only where necessary to control erosion, and re- vegetation.
Waterbars and other appropriate BMPs must be maintained and repaired as necessary.
Following successful re- vegetation, remaining waterbars are to be flattened to blend with
the slope.
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Skinner Ridge Master SWMP Chevron U.S.A., Inc.
3.2.3 Road Completion and Reclamation
Maintenance activities normally required include blading, surface replacement, dust
control, spot repairs, slide removal, ditch cleaning, culvert cleaning, litter pickup, noxious
weed control, maintenance of interim reclamation, and snow removal. Additional
inspections and maintenance may be needed during periods of snowmelt or heavy,
prolonged rainfall to look for drainage, erosion, or sedimentation problems.
Re- vegetation of road ditches and cut and fill slopes will help stabilize exposed soils and
reduce sediment loss, reduce the growth of noxious weeds, reduce maintenance costs,
maintain scenic quality and forage, and protect habitat. To ensure successful growth of
vegetation, topsoil must be stored in designated stockpiles (where available) during road
construction and re- distributed on cut slopes, fill slopes, and borrow ditches prior to re-
vegetation activities.
3.2.4 Facilities Production Activities and Reclamation
Many of the facilities constructed will be active for as long as the field is in production.
As part of operations, materials and chemicals may be stored onsite. All product and any
generated wastes will be placed and stored in the proper receptacles prior to use or
removal for off -site disposal. Where appropriate, secondary containment will be
provided for storage of materials, chemicals, and wastes. All petroleum based materials
will be stored in accordance with the Piceance Basin Field SPCC plan.
Housekeeping will be maintained in all chemical storage areas. All containers are to
remain closed except when transferring materials in and out of the container. Where
appropriate, materials will be stored to prevent their containers from being exposed to
precipitation events.
Interim reclamation consists of minimizing the footprint of disturbance by reclaiming all
portions of the site not needed for support of production operations. The portions of the
site not needed are to be re- graded to a final or intermediate contour that blends with the
surrounding topography as much as possible. Topsoil will be re- spread over areas not
needed for all weather purposes and the areas will be re- vegetated with native grasses.
"Final stabilization" means that all ground surface disturbing activities at the site have
been completed, and all disturbed areas have been either built on, paved, or a uniform
vegetative cover has been established with an individual plant density of at least 70
percent of per- disturbance levels. Documented inspections will be performed during this
period to ensure proper site stabilization.
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Skinner Ridge Muter SWMP Chevron U.S.A., Inc
3.3 Final Reclamation
Following the development and production phases, all production facilities will be
reclaimed by contouring disturbed soils to conform to the surrounding terrain, by
replacing the stockpiled top soil, by seeding of disturbed soil areas in order to reestablish
cover vegetation, and by construction of erosion and sediment control structures as
needed.
Once stabilization is achieved, defined as uniform vegetative cover established with a
density of at least 70 percent of pre- disturbance levels, a construction project may be
removed from the SWMP inspection program. BMPs will stay in effect as an ongoing
company practice to ensure proper management of storm water protection. If petroleum
hydrocarbons or other chemicals impact stormwater as a result of industrial activities
onsite, the impacted stormwater will be addressed by following the provisions contained
in the Piceance Basin Field SPCC plan.
3.3.1 Well Pads - Final Reclamation
The site will be reclaimed after the end of its operational life in accordance with local,
state and federal requirements. Following well plugging, reclamation activities will
include removing ail production equipment and re- grading the site to the original
contours of the surrounding terrain. All excavations and pits must be closed by
backfilling when they are dry and free of waste.
Subsequent steps include replacement of topsoil, re- vegetation of the site with the
appropriate seed mix (see Table 2), and installation and maintenance of storm -water
controls until final stabilization is achieved. Water breaks and terracing should only be
installed when absolutely necessary to prevent erosion of fill material and should be
removed when the site is successfully revegetated and stabilized.
33.2 Pipeline - Final Reclamation
Final abandonment of pipelines and flowlines will involve flushing and properly
disposing of any residual fluids remaining in the lines. All pipeline sections that have
become exposed due to water or wind erosion, soil movement, or anticipated subsequent
use, must be removed- Deeply buried lines may remain in place unless otherwise
directed by the authorizing agency.
3.3.3 Roads - Final Reclamation
Roads used to access oil and gas locations are typically constructed for that primary
purpose, are rarely permanent, and exist only as long as necessary to complete
exploration and production operations.
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Skinner Ridge Master SWMP Chevron U.S.A., Inc
Final reclamation includes re- grading the road back to the original contour, seeding,
controlling noxious weeds, and may include other techniques to improve reclamation
success such as ripping, scarifying, replacing topsoil, placing waterbars, pitting, and
mulching. Seeds of native, perennial species will be used.
3.3.4 Facilities - Final Reclamation
The site will be reclaimed after the end of its operational life in accordance with local,
state and federal requirements. Reclamation activities will include removing all buildings
and equipment and re- grading the site to the original contours of the surrounding terrain.
Subsequent steps include replacement of topsoil, re- vegetation of the site with the
appropriate seed mix, and installation and maintenance of storm -water controls until final
stabilization is achieved. Water breaks and terracing should only be installed when
absolutely necessary to prevent erosion of fill material and should be removed when the
site is successfully re- vegetated and stabilized.
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Skinner Ridge Master SWMP Chevron U.S.A.. Inc.
4.0 POTENTIAL POLLUTION SOURCES
Potential pollution sources associated with construction sites and natural gas development
include:
• Sediment resulting from erosion of soil stockpiles and other areas cleared of
vegetation;
• Leakage of fuels and lubricants from equipment and spills from fueling;
• Trash and debris from clearing activities, construction materials, and workers;
• Leakage or spills from storage tanks and process equipment associated with
natural gas development
• Concrete washout water,
• Vehicle tracking
The most common source of pollution from pad and access road construction is sediment,
which can be carried away from the work site with storm water runoff and impact the
water quality of a receiving stream. Clearing, grading, and otherwise altering previously
undisturbed land can increase the rate of soil erosion over pre- disturbance rates.
Refined Petroleum products can also be potential storm water pollutants. These products
are used in construction activities to power or lubricate equipment and include: fuel, gear
oil, hydraulic oil, brake fluid, and grease.
Loading and unloading of condensate and produced water from above ground storage
tanks are common and regular activities within the Skinner Ridge project area that may
contribute to stormwater contamination.
Debris from Iaydown areas, residue from equipment cleaning and maintenance, and solid
waste generated from land clearing operations and human activity (trees, brush, paper,
trash, etc.) present other potential pollution sources within the construction site.
Spills or leaks from potential petroleum based sources are described in the SPCC plan.
Response to certain events may require specialized training due to health and safety
concerns. For a list of down -hole chemicals used during development activities please
refer to Appendix B.
Concrete trucks must be rinsed out prior to leaving the site and this water has the
potential to contaminate stormwater if not properly handled. Typically concrete wash out
waters will be diverted to reserve pits or other earthen impoundments to capture and
evaporate wash out water.
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Skinner Ridge Master SWMP Chevron USA., Inc. Skinner Ridge Muter SWMP Chevron U.S.A., Inc.
5.0 DESCRIPTION OF CONTROL MEASURES
The objective of erosion and sediment controls is to minimize the release of sediments to
storm water runoff. This can be accomplished through a combination of structural and/or
nonstructural controls. The following sections provide a description of typical BMPs
employed to prevent soil erosion, work practices and managerial controls used to prevent
storm water impacts, and fuels, chemicals, and materials handling practices.
5.1 Soil Erosion and Sediment Controls
The objective of erosion and sediment controls is to minimize the release of sediments to
storm water runoff. This can be accomplished through the use of structural and/or
nonstructural controls. This section describes physical erosion and sediment controls to
be used at active construction sites to minimize possible sediment impacts to storm water
runoff. For BMP installation details and selection guidelines refer to Appendix C and
Figure 2.
Berms
A berm is a ridge of compacted soil Located at the top or base of a sloping disturbed area
to contain or divert surface runoff. Where used, soil berms shall be constructed of soil
with sufficient fines to minimize flow through the berm. The purpose of a berm is to
control runoff velocity, divert onsite surface runoff to a sediment trapping or filtration
device and/or divert clean water away from disturbed areas.
Check Dams
Check darns are small, temporary dams constructed across a diversion or roadside ditch.
Check dams can be constructed using gravel, rock, gravel bags, geo- ridges, earth with
erosion control blanketing, straw bales, or wattles and are used to slow the velocity of
concentrated flow in a channel. As a secondary function, check dams can also be used to
catch sediment from the channel itself or from the contributing drainage area as storm
water runoff flows through or over the structure.
Culverts
Culverts are typically used to move ditch water under the road or to direct stream flow
under the access road. Culverts are typically constructed out of concrete, steel,
aluminum, or plastic pipe. Where used, culverts should have inlet and outlet protection
features to minimize erosion such as placing a non -woven textile material under rip rap at
each end of the culvert.
Diversion
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Permanent diversion berms and structures control storm water runoff by using a channel
and an earthen ridge to prevent sediment laden storm runoff from leaving the
construction site, well pad or other disturbed area, to prevent flows from eroding slopes
and to direct sediment Laden flows to a trapping device. Diversions are most often
constructed of earthen materials with vegetative cover and are best used with channel
linings such as vegetation or matting. Diversions are typically used wherever the
direction and velocity of runoff from up slope areas need to be controlled. A good
example would be diverting upgradient surface runoff away from a well pad. Channels
and berms must be designed to manage peak storm flow and must be stabilized to prevent
erosion of the channels.
Drainage Dip
Drainage dips intercept and remove surface water from the access roads, pads, facilities,
pipelines, and roadside ditches (before the combination of water volume and velocity
begin to erode.) Drainage dips are constructed diagonally across the flow of the surface
water and will pass slow traffic while dispersing surface water.
Erosion Control Blanket
Erosion control blankets, and turf reinforcement mats (TRM), are porous fabrics and are
manufactured by weaving or bonding fibers made from organic or synthetic materials.
Erosion control blankets are installed on steep slopes, over berms, or in channels to
prevent erosion until final vegetation is established. The erosion control blankets can also
be used as separators or to aid in plant growth.
Filter Berm
A filter berm is temporary ridge made up of natural materials that already occur on the
project site. Brush filter berms use small tree branches, root mats, grass, leaves, stone or
other debris or material naturally available or left over from the site clearing and
grubbing. Rock filter berms use site gravel, stone, or rock. Both types of filter berms are
placed along a level contour to slow, filter, and divert flow and act as an efficient form of
sediment control.
Georidne
GeoRidge® is a permeable ditch berm designed for erosion and sediment control. The
use of GeoRidge® reduces flow velocities and provides a smoother water flow resulting
in less erosional energy, and thus minimizing the problem of downstream sediment.
Gravel Surfacing
Gravel surfacing may be used to cover soil in areas of high traffic source as roads, facility
areas, and areas near the well heads. Gravel surfacing forms a layer that protects and
minimizes soil erosion and vehicle soil tracking.
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Skinner Ridge Master SWMP Chevron U.S.A., Cue.
Land Grading
Grading involves reshaping the ground surface to planned grades as determined by an
engineering survey, evaluation, and layout. Grading provides more suitable topography
for well pads, pipelines, facilities and access roads and helps to control surface runoff,
soil erosion, and sedimentation during and after construction in these areas. Grading also
includes road crowning and sloping to properly route runoff off the access roads.
Level Spreader
A level spreader is a BMP used to prevent erosion and to improve infiltration by
spreading concentrated storm water runoff evenly over the ground as shallow sheet flow
instead of through channels. It usually involves a depression in the soil surface that
disperses flow onto a flatter area across a slight slope and then releases the flow onto
level vegetated areas. This reduces flow speed and increases infiltration and promotes
evaporation.
mulching
Mulching is a temporary erosion control practice in which materials such as grass, straw,
hay, wood fibers or wood chips are placed on exposed or recently planted soil surfaces.
Mulching stabilizes soils by minimizing rainfall impact and reducing storm water runoff
velocity. When mulching is used in combination with seeding, surface soils retain
moisture, promote seed germination and help insulate roots from extremes temperatures.
Retaining Wall
Retaining walls are structures that are used to stabilize and hold soil in place, gain space
on roadways or well pads, or to keep soil contained within a site boundary. This BMP can
be constructed with rock, boulders, and/or cement blocks.
Revegetation
Revegetation involves planting seed to establish a vegetative cover on disturbed areas.
Revegetation reduces erosion and sedimentation by stabilizing disturbed areas in a
manner that is economical and adaptable to site conditions. It also reduces runoff
volumes by increasing water percolation into the soil, binds soil with roots, and protects
soil from wind erosion. The permanent seed mix, rate, and application method is
provided on Table 2.
Riprap
Riprap is a permanent, erosion - resistant layer made of stones, rock, or boulders. It is
intended to stabilize areas subject to erosion and protect against scour of the soil caused
by concentrated, high velocity flows.
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Skinner Ridge Master SWMP Chevron U.S.A., Int.
Roadside Ditches and Turnouts
Roadside ditches are channels conducted parallel to roads. The ditches convey
concentrated runoff of surface water from roads and surrounding areas to a stabilized
outlet. Turnouts are used to effectively remove run-off water from the roadside ditch into
well - stabilized areas before it reaches a waterway.
Sediment Trap
Sediment traps are intended to intercept, trap, and retain sediment from runoff while
allowing detained runoff to slowly drain, infiltrate, or both. They are usually installed in a
drainage way or other point of discharge from a disturbed area. This BMP is formed by
excavating below grade and/or constructing an earthen embankment with a protected
spillway to slow the release of runoff.
Silt Fence
Silt fences are used as temporary perimeter control structures that are designed to slow,
temporary impound, and filter sediment laden water. Installation techniques and
maintenance is critical to proper performance.
Slope Drain
Slope drains are used with earth dikes and drainage ditches to intercept and direct surface
flow away from slope areas to protect cut or fill slopes. A slope drain is applicable for
any construction site where concentrated surface runoff can accumulate and must be
conveyed down a slope in order to prevent erosion. The slope drain may be a rigid pipe
such as corrugated metal, flexible conduit or a lined terrace drain with the inlet placed at
the top of the slope and the outlet at the bottom of the slope. Inlets must be securely
anchored and outlets must be stabilized with riprap.
Stabilized Construction Entrance
A stabilized construction entrance is a pad of gravel laid over filter cloth where
construction traffic will be entering or leaving a construction site to or from a public
right -of -way, street or highway. This is also referred to as vehicle tracking control. The
purpose of a stabilized entrance to a site is to minimize the amount of traced mud and
dust that leaves the site and tracked onto county roads or state highways. As a vehicle
drives over the gravel, mud and sediment are removed from the vehicle's wheels and
offsite transport of soil is reduced. This BMP reduces erosion, tire rutting and the filter
fabric separates the gravel from the soil below by minimizing the migration gravel into
subsurface soil from heavy vehicle loads. A stabilized construction entrance should be
used at facility ingress and egress locations.
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Skaeeer Ridge Mester SWMP Chevron U.S.A., lee.
Straw Bale Barrier
A straw bale barrier is a series of entrenched and staked straw bales placed on a level
contour to intercept sheet flows. The barrier reduces runoff velocity and filters sediment
laden runoff from small drainage areas of disturbed soil. This BMP may also be used to
protect against erosion in small shallow drainage channels.
Straw Wattles
Straw wattles or rolls are intended to capture and keep sediment on slopes or in small
shallow drainage channels. Straw rolls can be used to temporarily stabilize slopes by
reducing soil creep, sheet and rill erosion until permanent vegetation can be established.
Straw rolls will last an average of one to two years.
Surface Roughening
Soil surface roughening is a temporary erosion control practice often used in conjunction
with grading. Soil roughening involves increasing the relief of a bare soil surface with
horizontal grooves (emanating) or tracks ( tracking) using construction equipment
Slopes that are not fine graded and that are left in a roughened condition can reduce
erosion, trap sediment, and prepare ground surfaces for seeding.
Terracing
Terraces are made of either earthen embankments or ridge and channel systems that are
properly spaced along a fill slope. Terraces are constructed with an adequate grade to
promote drainage to a stabilized outlet. They reduce damage from erosion by collecting
and redistributing surface runoff to stable outlets at slower speeds and by decreasing the
distance of overland runoff flow. They also surpass smooth slopes in holding moisture
and help to minimize sediment Loading of surface runoff.
Vegetative Buffer
Vegetative buffers are areas of either natural or established vegetation that are maintained
to protect the water quality of neighboring areas. Vegetative buffers reduce storm water
runoff velocity, prevent soil erosion, promote infiltration and act as a filter to remove
sediment.
Water Bar
A water bar is an earthen ridge, or ridge and charnel, constructed diagonally across a slope
road, trail, or disturbed area. Water bars are normally used for drainage and erosion
protection of closed, blocked, or infrequently used roads to divert storm water runoff and
minimize erosion.
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Skinner Ridge Master SWMP Chevron US.A., lee.
Additional BMP references:
The structural and non - structural BMPs listed above are intended to include BMPs that
may be used for gas gathering projects. However, there may be situations where a BMP
is needed but not included above or project personnel may need additional information on
the use, specification, and maintenance of BMPs. Additional information resources are
listed below:
• For oil and gas operations, the Bureau of Land Management and U.S. Forest
Service have developed "Surface Operating Standards and Guidelines for Oil and
Gas Exploration and Development,' "Gold Book." The most recent version
(fourth edition) of this is available on the Internet at
http:/ /www.blm.eov/bmp/Go]dBook Draft v12.pdf.
• For construction BMPs the Urban Drainage and Flood Control District, a
Colorado front range group of city and county agencies has developed a BMP
manual that is available on the internet at http: / /wwv.udfcd.oru/usdem/vol3.htm
• For construction BMPs and surface stabilization methods. the Alabama Soil and
Water Conservation Committee have developed "Erosion Control. Sediment
Control and Stormwater Management on Constmction Sites and Urban Areas,
Volume 1 Developing Plans and Designing Best Management Practices." This
information is available on the Internet at
hurl /swcc.state.al.uv'pdf /ASWCC June 2003 Alabama Handbook _Construetio
n t:$S Control.pdf
• For access roads, the US Forest Service and Bureau of Land Management have
developed "Low - Volume Roads Engineering, Best Management Practices Field
Guide," which is available on the Internet at
http ;//www.b1m.aav/bmn /field %20guidc.htm
5.2 Storm Water Management Controls
Structural BMPs will be installed, inspected, and maintained as needed. Description of
typical BMPs that may be used on individual construction sites are provided in Appendix
C. This SWMP will be revised as needed to address new disturbances. Depending on
the type and location of new facilities there may be a need for inclusion of new and
different BMPs, in general, new development should be planned with consideration for
storm water quality (e.g. minimize disturbed area and maximize distance from surface
wafer drainages. as practicable).
Other developments on the property, primarily existing and/or improved roads, not
currently or specifically addressed in the SWMP will be periodically checked for erosion
and drainage problems. This is especially important for access roads located within 100
feet of surface drainages or creeks. If problems are noted, they should be reported to the
Operations Supervisor and/or Chevron SWMP Administrator. Problem areas may be
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Skinner Ridge Master SWMP Chevron U.S.A., Inc.
addressed through construction activities, hut will likely need to be addressed through
BMPs which will be added to the plan as needed.
5.3 Other Controls
Waste Management and Disposal
Well pad construction and drilling will generate various other wastes during the course of
construction. Other wastes may include the following:
Sagebrush, shrubs and trees from clearing operations;
• Trash and debris from construction materials and workers;
• Drill cuttings, drilling fluids, frac sand, completion fluids; and
Sanitary sewage.
Each of these wastes will be managed so as to not contribute to storm water pollution.
Construction trash and debris will be collected in containers and hauled off -site for disposal
in suitable landfills. Sanitary waste will be containerized in portable toilets or other storage
tanks with waste materials regularly pumped and transported off -site for disposal at
approved facilities.
Fuels and Materials Management
Petroleum products which may be present at the construction site include: gasoline, diesel
fuel, lubricant oils, hydraulic oils, used oils, and solvents. Gasoline, diesel fuel, lubricant,
hydraulic, and miscellaneous oils and solvents will be stored in portable storage tanks with
secondary containment.
Pollutants from petroleum products used during construction activities adhere easily to soil
particles and other surfaces. In case of a spill or leak, soils contaminated with petroleum
products will be contained and removed to a proper disposal site. Proposed soil erosion
and sediment control practices will aid in retention of spills or leaks. Use of secondary
containment and drip pans will reduce the likelihood of spills or leaks contacting the
ground. Proposed maintenance and safe storage practices will reduce the chance of
petroleum products contaminating the road site. Oily wastes such as crankcase oil, cans,
rags, and paper containing oils will be placed in proper receptacles and disposed of or
recycled. An additional source of petroleum contamination is leaks from equipment and
vehicles. Routine daily inspections will be conducted to identify leaks and initiate
corrective actions, if needed. The Piceance SPCC plan and or Emergency Response Plan
will be activated as appropriate to manage any petroleum product spill.
The following guidelines for storing and managing petroleum products will be used:
- All product containers will be clearly labeled.
• Drains will be kept off the ground within secondary containment and stored under
cover if needed.
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Skinner Ridge Master SWMP Chevron USA., Inc.
• Fuel tanks will be stored within secondary containment or in the case of an active
drilling pad operation, provided with a collection system that would direct any
release to the reserve pit.
• Lids of drummed materials will be securely fastened.
• Emergency spill response procedures will be available on -site.
• Spill clean up and containment materials (absorbent, shovels, etc.) will be easily
accessible. Spills will be immediately cleaned up and contaminated materials will
be properly stored on site until they can be disposed of in accordance with
applicable regulations.
• Storage areas and containers will be regularly monitored for leaks and repaired or
replaced as necessary. Contractors and subcontractors should be reminded about
proper storage, handling and transferring of petroleum products or other hazardous
materials during safety meetings.
All spills and releases of exploration and production waste or produced fluid exceeding 5
barrels (210 gallons) including those contained within unlined berms, shall be reported in
writing on the COGCC Spill/Release Report Form 19 within 10 days of discovery of the
spill.
All spills/releases that exceed 20 barrels (840 gallons) of exploration and production
liquids/waste shall be reported on the COGCC Spill Release Report, Form 19, and shall
also be verbally reported to the COGCC at (303) 894 -2100 within 24 hours of discovery.
Spills or releases of any size that impact or threaten to impact any waters of the state,
residence or occupied structure, livestock or public byway, shall be reported in writing on
the COGCC Spill/Release Report Form 19 and shall also be verbally reported to the
COGCC immediately after discovery (COGCC Rule 906). If the spill impacts waters of
the state (which includes surface water, ground water and dry gullies or storm sewers
leading to surface water), it must also be reported immediately to the Colorado
Department of Public Health and Environment (CDPHE) at 1 -877- 518 -5608 and the
National Response Center at 1 -800- 424 -8802.
Any size discharge (i.e. one that creates a sheen, emulsion, or sludge) that affects or
threatens to affect navigable waters of petroleum crude oil products such as gasoline,
diesel fuel, oil, or derivatives of mineral, animal or vegetable oil shall be reported to the
National Response Center and the state of Colorado Division of Oil and Public Safety at
(303) 318 -8547 within 24 hours.
A hazardous substance release in any amount which enters or threatens to enter waters of
the state shall be reported to Colorado Department of Public Health & Environment
(CDPHE) and the National Response Center.
Other Chemicals Products Management
Additional materials will be used and stored on site for use in construction. These
materials will be stored appropriately and managed to minimize spills and leaks. Storage
27
Skinner Ridge Master SWMP Chevron U.S.A., toe.
areas will be regularly inspected and any minor spills or leaks will be cleaned up
immediately.
Materials Management
The construction contractor will maintain a Iaydown or staging area for equipment and
materials storage on site. These areas will be maintained with good housekeeping and will
be inspected on a regular basis for spills, leaks, and potential of materials commingling
with storm water runoff.
5.4 Construction Site Housekeeping
Housekeeping will consist of neat and orderly storage of materials and containerized
fluids. Wastes will be temporarily stored in containers and regularly collected and
disposed of at approved off -site facilities. If spills occur prompt cleanup is required to
minimize any commingling of waste materials with storm water runoff.
Routine maintenance will be limited to fueling and lubrication of equipment. Drip pans
and/or absorbent material will be used during routine fueling and maintenance to contain
spills or leaks. Any waste product from maintenance will be contained and transported
off site for disposal or recycling. All attempts will be made to minimize major equipment
overhauls conducted on site. Equipment will be transported off site for major overhauls
if required.
Cleanup of trash and discarded materials will be conducted during the course of each
work day. Cleanup will consist of patrolling the road way, access areas, and other work
areas to pickup trash, scrap debris, other discarded materials, and any contaminated soil.
These materials will be disposed of in accordance with all applicable rules and
regulations.
28
Skinner Ridge Master SWMP Chevron U.S.A., Inc.
6.0 INSPECTION AND MAINTENANCE PROCEDURES
To meet requirements of the General Permit, inspection and maintenance of erosion and
sediment controls must occur during the project. The inspection program will include the
following:
1. A trained and qualified person familiar with the SWMP and storm water controls
will conduct facility inspections and complete the Storm Water Field Inspection
Report form in Appendix D.
2. Inspections will cover these areas:
• Evidence of surface erosion for disturbed areas;
• Material and chemical storage areas;
• Best Management Practices (BMPs);
• Surface water diversions and down gradient areas;
• New access roads and ditches; and
• Locations where vehicles enter or exit the site.
3. Routine Inspections will be performed at least once every 14 or 30 calendar days
in accordance with State requirements and within 24 hours after a significant
precipitation or snow melt event that causes erosion. If no construction activities
occurs following a storm event, post -storm event inspections shall be conducted
prior to re- commencing construction activities but no later than 72 hours
following the storm event.
4. Permanently stabilized areas will be periodically inspected to monitor ongoing
conditions.
5. A log of inspections will be completed and maintained for a minimum of three
years. A copy of the inspections will be kept at the Hiner Gate Field Office along
with electronic copies in the Grand Junction office..
6. Inspections are not required for disturbed areas when snow cover exists over the
entire site for an extended period as long as melting conditions do not exist.
7. Water quality will be visually assessed for all receiving streams and discharge
areas during each inspection if present.
8. Disturbed areas and material storage areas that are exposed to precipitation will be
inspected for evidence of pollutants entering nearby drainages.
9. Check dams, wattles, and other BMPs will be inspected for evidence of
deterioration, under - cutting, and build up of sediment. Sediment will be removed
when it has built up one -third to one -half the height of the hay bales or wattles.
29
Skinner Ridge Master SWMP Chevron U.S.A. , tne.
10. Roads used for vehicle access will be inspected for evidence of oft -site sediment
transport.
11. The SWMP will be modified as necessary whenever there is a change in design,
construction or operation that changes the potential for pollutant discharge to
waters of the state.
12. An inspection report summarizing the scope of the inspection, the name of the
person conducting the inspection, date of inspection, and observations relating to
the implementation will be prepared. An example inspection report is provided in
Appendix D.
13. Actions taken to modify storm water control measures will be recorded with
inspection reports and maps and maintained with the SWMP.
Personnel performing facility inspections such as access roads, well pads or other
operational facilities will record site conditions on the Storm Water Inspection Report form
in Appendix D. Immediately when deficiencies are discovered, the Chevron local contact
will be contacted and will direct designated subcontractors to perform BMP maintenance or
replacement. Maintenance will include prompt adjustments and repairs to erosion and
sediment control structures that are found to be performing inadequately or deteriorating.
Signs of rill or gully surface erosion shall be immediately repaired. The Chevron local
contact has the authority and will coordinate subcontractors to install new and or additional
storm water control BMPs as needed.
30
Skinner Ridge Munger SWMP Chevron U.S.A., Inc.
7.0 NON - STORMWATER DISCHARGES
Non -storm water discharges anticipated from the project include permitted construction
dewatering and pipeline hydro -test waters.
In addition, the extraction of natural gas can produce large quantities of water that are
trapped in the formation along with the gas. Over the next two years, much of the
produced water will be used for hydraulic fracturing operations or disposed of in an on-
site permitted injection well. In 2010 a water treatment plant is expected to begin
operating and remove salts and any remaining hydrocarbons. The treated water will be
used for drilling operations and potentially as a potable water source. Depending on the
level of treatment achieved and volume of water treated, a permit may be pursued to
discharge treated effluent either into surface water or ground water at the project location.
Brine and solids are anticipated waste streams from this process. Current plans are to use
permitted disposal injection wells for the brine and to transport the solids to a permitted
waste disposal facility.
31
Skinner Ridge Master SWMF' Chevron U.S.A. Inc.
8.0 FINAL STABILIZATION
Areas which have been disturbed are considered to be stabilized when a uniform vegetative
cover with a density of 70 percent of the pre- disturbance levels has been established or
when an equivalent permanent, physical erosion reduction method is in- place. The
disturbed areas will be seeded and mulched for final stabilization. Table 2 contains
approved seed mixtures and application rates provided by the Natural Resources
Conservation Services (MRCS) for the Skinner Ridge project area. Typical Pure Live Seed
(PLS) application rates are recommended to be doubled if seeding is performed by hydro-
seed or broadcasting.
Areas not used for facilities, access roads, materials storage yards, or other work areas will .
be stabilized with vegetation. Areas that are stabilized with vegetation will be considered
to have achieved final stabilization when a uniform stand of vegetation with a density of at
least 70 percent of the pre- disturbance has been established. Sprayed on mulches and other
slope stabilization materials may be used in combination with seeding techniques in select
areas to promote and establish surface vegetation cover. Other areas which may include
facilities, access roads, materials storage yards, and other work areas will be stabilized with
the use of permanent, physical erosion reduction methods which include, but are not
limited to:
1, Surface hardening — covering of the soil surface with hardened products such as
concrete or asphalt pavement.
2. Surface covering — covering of the surface soil with structure that inhibits contact of
precipitation with the soil surface which is generally considered to be placement of
a structure (building or tank) over the soil surface.
3. Gravel surfacing — gravel surfacing will be applied in areas such as access roads,
materials storage yards, and other work surfaces. Some gravel may be lost due to
erosion from intense precipitation events or due to vehicle traffic. Gravel surfaces
will be periodically inspected to determine the need for gravel replacement. Gravel
surfaces will be replaced or repaired (through grading) when inspection reveals that
the gravel surface is no longer effectively covering the soil surface.
32
Table 2
020011 ,Sun
011113110 26010 012121250(1 920!11911126 10010 911 1.01101 lass) qeg L10001 smislunoA 8L
xmdmo0
- a».s20L0A al.upwunl .x01S Pa0!0IP IPM P!d01 119 -114 9 m v . d mmu0010 4a9oA-sallgge9 SL
m .0015011 0p10S91 0022 - 1140.126
490709
111 &mu°
10111 WA aw.1pm P.gmA IPM P1:4e11 06 -0't 5 ,gyw.aiun sz1e0g mmf. ^91 Laa11 1002.0.1;1
10
01.201mg9 000,
21111120111 / x011012009091 P0719 112M 089311 9.1 weal 2201/1109 020.111) 00
OM. 0.0A 11.01 0!0!050 1101 3001904 .' 9-IIa damn,
5 li !up 11026 P!dex 9C -01 Pmlpuomun AO-n:11!410012 69
01 .0010! Lpu2g 300N.1pss10uL
2u.21 011A 110010291 9.01,.P 19.45 P1611 09-00 01001 men! 029019 L1000911200L L9
9414019
...... f... 21002 01am0pou0 0121!011222 ..w. A... .,, if 91101919 ......_.......... 10!120x0120200 mi 11391
99
0192100/5 IPM
3.1.31,wa 0110 P2m..1P IRx
,I 14975 5011 11501.05,91 .x015 121-1 •11.01 apes utm0lwN 10001 AK E9
20211.0209 2202ap0(1 F.0.911026 2!12111 65-40 urea1 1:02011. 1w1n1xrn 101111 9S
.Suwo7 pun use/ .Slimy - in3ui,umoomd
- 11102s ,Vas 010.050122 palgup IPA", P1 001, wan? 0212015 Ltiue04 x11!4.001 SS
012( 250522 0.01019115 mar 10.111!.1000(1 Il202 j -0n900J0d
149!1S x010 0121, 2019 502l221P 11292 10019 5-1 01001 9060911111909-3 021911024 511
10022 km 01200 I
m 2.0019 9011 Pau tut) K01 m 01^!F1W 05-9 me l (e L1 113 3ued1e9,SrA0AS Ppy- .001202211x229 ES
uearaoae
- 30099 :10571 9a01.0P IPM POW 59-02 mom 090100 d00101029 domino 9F
39090144011
- 20099 1/01150122 9091815112A1 011.92(1 52-21 L2sp 4 1A 24015 Lumol 11121209 it
- 00019 2101/50224 92901' 11126 02016 21 -E 1017 LP011 w093wdoo :144011 1'6
WAS 11
01a0.0150(9 Pa0?e1P P14011 09.00 ,4suus00I
o9 111100112 nmun019 oango.p 21
maul Lela Outs
4991 948gS m,IS Pa•!•0P 0S200d 26015 E-0 .Slla0dm101n1-1 mow,/ .0018 01ua26e0n19, 90
120099 112020 922211115111/5 00250(1 5-5 "1001 Lei 100010112.111912920 12( 00300,91 55
11(895 0+015 P.,,,5 11a/5 ..010 E -9 uwol imp 001„ 121 .) 0011ap2us25 0a2012wn07 If
20099 P51.2 000115102 91101AP 01/5 P01 Oil faleuxua LuA maul 6691 00(4090(! 6Z
0
0110205001 909009 )00
,x 12
maul 0010 M0,04014011
10115091 149!18 malu2poh' wyxaumc x9211 E -[ L9ws 1211a0.20� 110.x9111010012 0110.1 11 92
01 Pa0!.12 PAS
20120 xots 0111.05091 512011115 IPM 0015 9-1 0e010911.9 011201111!1191V 1310x90001 01
12001(2 3101150(1 50.001911026 211219 0(^02 001101011201{1 0044.1(11191003 12021110..110192191 L
- 201018 11.12901,1 929019 IPM 0.01949 121•0 011101 u1001 3m1109 010(4 0
aunts 121A x010 LOA 9202001, 111/5 Rldu 12,A 69-01 p22aywP N, .000010 {w 02012354 W.IR11 Z
120129091 19996 121305619 1a099 1P116 20015 0 -0 11.0101015. 100009001)1 ely 1
1.1!1,17194 11111.210.1 1103
3.052.11 pus u.110a3 Aergestuam 111.9] 1.!1,111012 ri01g 11091,1 .01112112025
00µ101.m0,1 .010,26 anrms,a young 11!05 r..y leiltai023 009241105 120.4
faddy 1105 wes9uld 1'1901
Table 2
Final Stabilization Seed Mixtures
*Elevations up to 7,000ft*
Species
Variety
% in mix
Drill Rate
LS
Species
„tn nr.t nir_ :
% in mix
25
- 2.8
5.6
Galleta Grass (floret
Viva
25
2.8
5.6
Alkali Sacation
Sandy
Drvpseed
ifsan. )
25
0.4
0.8
Indian Rice_
Paloma
25
3.0
6.0
Native
and Introduced Mixture/Variety
Species
Species
Variety
% in mix
Drill Rate
(PLS)
Broadcast
Rate (PLS)
Crested Wheatgrass
Ephraim
25
1.5
3.0
Galleta Grass (floret)
Viva
10
1.1
2.2
Alkali Sacation
Sandy
Dropsced
(ifsandy)
15
0.2
0.2
Indian Ricegrass
Paloma
25
3.0
6.0
Russian Wildrye
Bozoisky
25
2.5
5.0
*Elevations 7.000 to 9.000ft*
Table 2
Final Stabilization Seed Mixtures
*Elevations 7,000 to 9,000ft*
HLPV44•
a
Species
Variety
Variety % in mix
Drill Rate
Broadcast
Rate (PLS)
,.r,n1arr.%ary .zc
Critana 25
2.5
5.0
Western WheatGrass
25
4.0
8.0
Green Necd1e s
25
2.5
5.0
Prairie Jun
MIMI 15
5.0
0.4
R. ... ' . , .o , .
Bandera 10
0.6
1.2
Fourwin_ Saltbrush
Add on
10
2.0
Table 2
Final Stabilization Seed Mixtures
*Elevations 7,000 to 9,000ft*
'PLS = Pure Live Seed
HLPV44•
a
Species
Variety
% in mix
Drill Rate
(PLS)
Broadcast
Rate (PLS)
Pubescent Wheatgrass
Luna
25
2.5
5.0
Western Wheatgrass
Arriba
25
4.0
8.0
Russian Wildrye
Bozoisky
25
2.5
5.0
Alfalfa
Ladak
15
0.2
0.4
Small Burnet
Delay
10
0.6
1.2
Fourwing Saltbrush
Add on
1.0
20
'PLS = Pure Live Seed
Figure 1
Figure 2
BMP Selection Guidelines
Clearing Stage
Production Stage
Reclamation Stage j
Dada
Pads
Pads
Filter Bcun
Land Grading,
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Filter Bern.
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bale Ranier
Surface Raughcnine
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Gravel Surfacing
Barn
Check Dams
Drainage Dip
Erosion Control Blanket
Slope Drain
Slope Stabilisation
Filter Berm
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Slaw Bale Barrier
Surface Roughening
Terracing
Vegetative Buller
Water Bar
Diversion Ditch
Gravel Surfacing
Bum
Cheek Dams
Drainage Dip
Erasion Control Blanket
Mulching
Slope Stabilization
Piielbles
'-i
_`.JslP.Iflellfi
ift:Wl'i:;r'•
?
Hoes __ -'...
Fitter Berm
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
_
Filter Berm
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bala Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Cheek Darns
Culverts
Culvert Protection
Drainage Dip
Rcvcgetation
Slope Stabilization
Filter Bens
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Farce
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Check Dams
Culverts
Culvert Protection
Draiatade Dip
Erosion Control Blanket
Mulching
Revegetation
Slope Stabil imtinn
Clearing Stage
Production Stage
Reclamation Stage
Access: Roads
Access Reads
Areas Roads
Filter Berm
Land Grading
Level Spreader
Wattles
Ripmp
Sediment Trap
Silt Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Stiffer
Water Bar
Diversion Ditch
Gravel Surfacing
Roadside Ditches
Tnmouta
Stabilized Entrance
Filar Benn
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Gravel Surfacing
Check Dams
Berm
Culverts
Culvert protection
Drainage Dip
Erosion Canhvl Blanket
Retaining Wall
Geo-Ridges
Revegetation
Roadside Ditches
Turnouts
Slope Drain
Stabilized Entrance
Slope Stabilization
Filter Berm
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Gravel Surfacing
Check Dams
Benn
Culverts
Culvert protection
Drainage Dip
Erosion Control Blanket
Mulching
Revegetation
Roadside Ditches
Turnouts
Stabilized Entrance
Slope Stabilization
Facilities'
- '
yekilf+ .f,'3.,c...,„4,,,, .I. -e
'— ..
. edit .z.`.�' .•
Filter Senn
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Gravel Surfacing
Fitter Berm
Land Grading
Level Spreader
Wattles
Riprap
Sediment Trap
Silt Fence
Shaw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Gravel Surfacing
Berm
Check Dams
Drainage Dip
Erosion Control Blanket
Revegetation
Slope Drain
Slope Stabilization
Filter Bran
Land Grading
Level Spreader
Wattles
Riprap
Sediment Tmp
Sih Fence
Straw Bale Barrier
Surface Roughening
Terracing
Vegetative Buffer
Water Bar
Diversion Ditch
Gravel Surfacing
Bend
Cheek Dams
Drainage Dip
Erosion Control Blanket
Mulching
Revegetation
Slope Stabilization
STATE OF COLORADO
Bill Bitter, Jr., Governor
James B. Martin, Executive Director
Dedicated to wowing and Improving the health and environment of the people of-Colorado
4300 Cherry Creek Dr. S.
Denver. Colorado 80246-1530
Phone (303) 6922000
TDD Line (303) 891 -7700
L350100 in Glendale. Colorado
httpdavwvmdpheatatam va
June 20, 2007
Laboratory Services Division
8100 Lowry Blvd.
Denver, Cddredo 80230-632B
(903) 8823090
Michael De Berry, Piceance Ops Mgr
Chevron USA Inc, Hector E. Cavazos
11111 S. Wilcrest P.O. Box 36366
Houston, TX 77099
970/257 -6005
RE: Final Permit, Colorado Discharge Permit System — Stormwater
Certification No: COR- 037787
Skinner Ridge Natural Gas Wells
Garfield County
Local Contact: George Badovinatz, Ops Super
970/257 -6002
Dear Sir or Madam:
Colorado Department
of PublicHealtl
2nd Environment
Y
tci. Enclosed please find a copy of the new permit and certification which have been re- issued to you
under the Colorado Water Quality Control Act
Your old permit expires on Dune 30, 2007. This is a renewal to the permit, and replaces the old one.
See page 2 of the Rationale (the pages in italics) for a summary of the changes to the permit
Your Certification under the permit requires that specific actions be performed at designated times.
You arc legally obligated to comply with all terms and conditions of the permit.
Please read the permit and certification. If you have any questions please visit our website at :
www.cdphc. state. co .uslwa /permitstmit/storonwate or contact Matt Czahor at (303) 692 -3517.
Sincerely,
rTh
Kathryn Dolan
Stornwater Program Coordinator
Permits Unit
WATER QUALITY CONTROL DIVISION
xc: Regional Council of Governments
Local County Health Department
District Engineer, Technical Services, WQCD
Permit File
STATE OF COLORADO
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
WATER QUALITY CONTROL DIVISION
TELEPHONE: (303) 692 3500
CERTIFICATION TO DISCHARGE
UNDER
CDPS GENERAL PERMIT COR -030000
STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION
Certification Number COR037787
This Certification to Discharge specifically authorizes:
Chevron USA Inc
LEGAL CONTACT:
Michael De Berry, Piceance Ops Mgr
Chevron USA Inc
11111 S Wilcrest P.O. Box 36366
Houston, IX 77099
Phone # 970/257 -6005
LOCAL CONTACT:
George Badovinatz Ops Super,
Phone # 970/257 -6002
During the Construction Activity: Gas /Oil Field Exploration and/or
Development
to discharge stormwater from the facility identified as Skinner Ridge Natural Gas
Wells
which is located at:
Tom Creek in Skinner Ridge area.
Garfield County, Co
Latitude 393877, Longitude 108.3418
In Garfield County
to: Tom Creek
Anticipated Activity begins 02/07/2005 continuing though 06/07/2006
On 3.4 acres (18.0 acres disturbed)
Certification is effective: 07/01/2007 Certification Expires; 06/30/2012
Annual Fee: 5245.00 (DO NOT PAY NOW — A prorated bill will be sent shortly.)
Page 1 of 22
Page 2 of 22
Permit No. COR -030000
CDPS GENERAL PERMIT
STORMWATER DISCHARGES ASSOCIATED WITH
CONSTRUCTION ACTIVITY
AUTHORIZATION TO DISCHARGE UNDER THE
COLORADO DISCHARGE PERMIT SYSTEM
In compliance with the provisions of the Colorado Water Quality Control Act, (254 -101 at seq., CRS, 1973
as amended) and the Federal Water Pollution 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
allowable non- stormwater discharges in accordance with Part LD.3 of the permit) certified under this permit,
from those locations specified throughout the State of Colorado to specified waters of the State. Such
discharges shall be in accordance with the conditions of this permit.
This permit specifically authorizes the facility listed on page I of this permit to discharge, as of this date, in
accordance with permit requirements and conditions set forth in Parts I and 11 hereof. All discharges
authorized herein shall be consistent with the terms and conditions of this permit.
This permit and the authorization to discharge shall expire at midnight, June 30, 2012-
Issued and Signed this 31" day of May, 2007
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Janet S. Rider
Permits Section Manager
Water Quality Control Division
SIGNED AND ISSUED MAY 31, 2007
EFFECTIVE JULY 1, 2007
TABLE OF CONTENTS
PART I
A. COVERAGE UNDER THIS PERMIT 3
1, Authority to Discharge 3
a) Applicable Sections 3
b) Oil and Gs Construction 3
2. Defmitions 3
3. Permit Coverage Without Application- Qualifying Local Programs 3
a) Appliable Sections 3
b) Low Agency Authority 4
c) Permit Coverage Termination. 4
d) Compliance with Qualifying Local Program 4
e) Full Permit Applicability 4
4. Application, Due Dates 4
a) Application Due Dross 4
b) Summary of Application 4
5. Permit Certification Procedures 4
a) Request for Additional Information 4
0) Automatic Coverage. 5
c) individual Permit Required 5
d) General vs. Individual Permit Coverage 5
e) Local Agency Authority 5
6. Inactivation Notice 5
7. Transfer of Permit 5
8. Reassignment of Pamir 5
9. Sale ofResiderceto Homeowners 6
10. Permit Expiration Date_.._ 6
11. Individual Permit Criteria 6
B. STORMWATER MANAGEMENT PLAN - GENERAL REQUIREMENTS 6
C. STORMWATER MANAGEMENT PLAN - CONTENTS 7
L. Site Description 7
2. Site Map..._....._ 7
3. Starmwater Management Controls 8
a) SWMPAdminisratm 8
b) identification of Potential Pollutant Sources 8
e) Best Management Practices (BMPs) for Stmrmtater Pollution Prevention - 8
4. Final Stabilization and Long -term Stormwater Management 9
5. Inspection and Maintenance 10
D. TERMS AND CONDITIONS 10
1. General Limitations 10
2. BMP Implementation and Design Standards 10
3. Prohibition of Non- Stormwatcr Dtxburges..._ 11
4. Releases in Excess of Relwrmble.Quantitiea 11
5. SWMP Requirements 11
a) SWMP Preparation sled Implementation 11
0) SWMP Retention Requirements 11
e) SWMP Review /Changes 11
d) Responsive SWMP Changes. I2
6. Inspections 12
a) Minimum Inspection Schedule.._ 12
b) Inspection Requirements 13
e.) Required Actions Following Site Inspections 13
7. BMP Maintenance ..._ 13
8. Replacement and Failed BMPs 14
9. Reporting 14
-2a-
TABLE OF CONTENTS (eons.)
10. SWMP Availability . 14
11. Total Maximum Daily Load (TMDL) 14
E. ADDITIONAL DEFINITIONS 15
F. GENERAL REQUIREMENTS 16
1. Signatory Requiremouts 16
2. Retention of Records 16
3. Monitoring 16
PART II
A. MANAGEMENT REQUIREMENTS 17
1. Amending a Permit Certification 17
2. Spetial Notifications - DefmitionS 17
3. Nonrnmpliance Notification 17
4. Submission of Incorrect or Incomplete Information 18
5. Bypass 18
6. Upsets 18
7. Removed Substances l8
8. Minimization of Adverse Impact. 18
9. Reduction, Loss, or Failure of Siormwater Controls L9
10. Proper Operation and Maintenance 19
B, RRSPONSIBILiTIES
1. Inspections and Right to Entry.._
2. Duty to Provide Information
3. Transfer of Ownership or Control
4. Modification, Suspension, or Revocation of Permit By Division
5- Permit Violations.
6. Legal Responsibilities
7. Severability
8. Renewal Application
9. Confidentiality
10. Fees
11. Requiring an Individual COPS Penoit
19
19
19
19
20
2I
21
21
21
2]
21
22
PART I
A. COVERAGE UNDER THIS PERMIT
1. Autl__mjasgEmpagge
PART 1
Permit - Page 3
Permit No. COR -030000
Under this permit, facilities are granted authorization to discharge sonmwata associated with construction activities into
waters of the state of Colorado. This permit also authorizes the discharge of specific allowable orn- sormwater discharges,
in accordance with Part 1i13 of the permit, which incNdca discharges the ground. This Inc/tides stormwater discharges
from areas that are dedicated to producing earthen materials, such as soils, sand and gavel. for use at a single 00rrsmncti00
sire a.e., borrow or fill areas). This permit also nutharizes stormwn0 discharges from dedicated asphalt batch punts and
dedicated concrete batch plants. (Coverage ander the construction site permit is not required for batch plants if they have
alternate CDPS permit coverage.) This permit does not amhorizethe discharge amine water or process water from such
a) Applicable Sections: In accordance with Part LA.3 of this permit, some pens of this permit do not apply to sites
coveted under a Qualifying Local Program, as defined in LA2d- For sites not covered by a Qualifying Local
Program, all pens of the permit apply except Part 1.A.3. The permitter will be responsible for dehrmiaing and them
complying with the applicable sections.
b) Oil and Gas Construction: Stmmwater discharges associated with construction activities directly related CO ot7 and
gas exploration, production, processing, and treatment operations or transmission facilities are regulated under the
Colorado Discharge Permit System Regulations (5CCR 1002 -61), and require coverage under this permit in
accordance with thin regulation. However, refercaces in this permit to specific authority under the Federal Clean
Water Act (CWA) do not apply to stormwater discharges associated with these oil and gas related construction
activities, to the extent that the references are limited by the federal Energy Policy Act of 2105.
2. DNIniGoes
a) stormwater: Steamwater is precipitation - induced surface runoff.
b) Construction activity: Construction activity refers o gro nd sulfa. disturbing activities, 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 171 materials, and borrow areas. Coost-aation does not include routine
maintenance to maintain original line and grade, hydraulic capacity. or original Purpose of the facility.
c) Small construction activity: Stormwater discharge associated with small croshvction activity means the discharge
of srormwoa from construction activities that result in land disturbance of equal to or greater than one acre and less
than five acres. Small construction activity also includes the disturbance of less than oae acre of toted land area that
is part of a lager cootrnon plan of development or sale, if the larger common plan will uthmately disturb equal to or
greater thane one and less than five acres.
d) Qnafdying Local Program: This permit includes conditions that incorporate qualifying local erosion and sedoment
control program (Qualifying Local Program) raryiremralo by reference. A Qualifying Local Program is a mnoicipal
stormwater program for stormwatcr discharges associated with small construction activity that has been formally
approved by the Division•
Other Definition: Definitions of additional terms can he found is Part I.E, of this permit
3. Permit Coverage Without Auplication— for small construction activities under a Qualifying Local Program oat
If a small coostructioo site is within the jurisdiction of a Qualifying Local Program, the operator of the constructer
activity is authorized to discharge stotmwater associated with small construction activity coda this general permit without
the submittal of as application to the Division.
a) Applicable Sections: For sites covered by a Qualifying Local Program, only Pmts 1.A.1, 1-A2, I A3,
I.D.3, 133.4, ID.7, 1J7.0,1.D.1 L, LE and Pmt 11 of this permit, with the exception of Pans IIA.1, 148.3. 11.B.B, and
11.810, apply.
PART 1
Permit - Page 4
Permit14o. COR- 030000
A. COVERAGE UNDER THIS PERMIT (cont.)
b) Loral Agra eyAnthority-. This permit does not pre -empt or supersede tie authority of Meal agencies to prohibit,
restrict, or control discharges of somtwarer so storm drain systems or other water courses within their jurisdiction.
c) Permit Coverage Termination: When a site tinder a Qualifying Local Program has been finally stabilized.
coverage under this permit is automatically terminated.
d) Compliance with Qoalllyiag Local Program: A construction site operator that has authorization to discharge
render this permit ceder Part L.A.3 shall comply with the requirements of the Qualifying Local Program with
jurisdiction over the site.
e) Fall Permit Applicability-. TheDivisim may require any operator within the jurisdiction of a Qualifying Local
Program covered under this permit to apply for and obtain coverage under the full requirements of this permit The
operator mast to notified in writing that an application for full coverage is required. When a permit certification
sander this pctmit is issued to an operator that would otherwise be covered tinder Pat 1.4.3 of this permit, the Hill
requirements of this permit replace tie requirements as per Part LA3 of this permit, upon the effective date of the
permit certification. A site brought under the full requirements of this permit must still comply with local
stormwater management rcqu'vemcnts, policies or guidelines as required by Pat LD.I.g of this permit
4. Aoalicat op. Due Dates
a) Application Diu Dates At least ten calendar days prior to the commencement of contraction activities, the
applicant shall submit an application form as provided by the Division, with a certification that the Stonawata
Management Pim (SWMP) is complete.
b)
One original completed discharge permit application shall be submitted, by mail or band delivery, to:
Colorado Department of Public Health and Envirroa recut
Water Quality Control Division
WQ(D- Permits -132
4300 Cherry Creek Drive South
Denver, Colorado 50246-1530
Summary of Application: The application requires, at ambsmum, the following:
1) The applicant's company name; address; telephone amber; and email address (if available); whether the
applicant is the owner, developer, or contractor, and local contact information;
2) Project name, address, county and location of the construction site, including the latitude and longitude to the
nearest 15 seconds of the approximate tatter of the co^eT1ction activity;
3) Legal description or map of the construction site;
4) Estimates of. the out area of the site, the area of the sire that is expected to be dismtbed, and the total area of
the larger common plan of development or saint° undergo disarhaoce;
5) The nature of the construction activity,
6) The anticipated start dale and final stabilization date for the project;
7) The name of the receiving water {s), or the mmticipal separate storm sewer system and the ultimate (i.e., named)
receivingwaa(s);
B) Certification that the SWNIP for the aonsauetion site is complete (sec Part LC. below); and
9) The signature of the applicant, signed in accordance with Pan LP.] of this permit
5. Permit Certification Yroodures
If this general permit is appropriate for the applicant's operation, then a certification will be developed and the applicant
will be authorised to discharge starnwater under this general permit
a)
Request for Additional Information: The Division shell have up to oat calendar days after receipt of the about
information 50 request additional data and/or deny the authorization for any paticulardisohargc. Upon receipt of
additional infoncation, the Division shall have an additional ten calendar days to issue or deny authottiamon for
the particular discharge. (Notification of denial shall be by letter, in casts where coverage tinder an alternate genera]
permit or an individual permit is required, instead of coverage under this permit.)
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PART 1
Permit -Page 7
Permit No. COR-030000
B. STORMWATER MANAGEMENT PLAN (SWMP)— GENERAL REQUIREMENTS (coot)
2. The SWMP shall:
a) Identify all potential sowccs of pollution which may reasonably be expected to affect the quality of stormwater
discharges associated with construction activity from the facility:
b) Describe the practices to he used to reduce the pollutants in slormwnter discharges associated with constntetion
activity at the facility; and ensure the practices are selected and described in accordance with good =sneering
practices, including the installation, implementation and maintenance requirements; and
c) Be properly prepared, and updated in accordance with Part I.D.5.c, to enso a compliance with the terms and
conditions of this permit.
3. Facilities must implement the provisions of the SWMP as written and updated, from commencement of construction activity
uric] final stabilirpoa is compete, as a condition of this permit The Divisive reserves the right to review the SWMP, and
10 require the permittee to develop and implement additional measures to prevent and control pollution as necdcd.
4, The SWMP may reflect requirements for Spill Prevention Canny'. and Countermeasure (SPCC) plans under section 311 of
the CWA, or Best Management Practices (BMPs) Programs otherwise required by a separate CDPS permit, and may
incorporate any part of such plans Trim the SWMP by reference, provided that the relevant sections of such plans ars
available as part of the SWMP coasisteat with Part
5. For any sites with permit coverage before Ante 30, 2007, the permitbee's SMWP must meet the new SWMP requirements as
summarized in Section B.1 of the rationale. Any needed changes must be made by October I, 2007.
C. STORMWATER MANAGEMENT PLAN (SWMP) — CONTENTS
The SWMP shall include the following items, ate minimum_
1. Site DeseriWinn. The SWMP shall clearly describe the construction activity, to ncludm .
a)
b)
c)
d)
D
8)
Ii)
The nature of the construction activity at the site.
The proposed sequence for major activities.
Estimates of the total area of the site, and the area end location expected to be disturbed by clearing, excavation,
grading, or other eoastrnction activities.
A summary of any milling data used in the development of the site construction plans or SWMP that describe the
son or czistiig potential for ao0 erosion.
A descriptiea of the existing vegetation at the site and an estimate of the percent vegetative ground cover.
The location and dcscnptien oral] potential pollution sources, including ground surface disturbing activities (see
Pan I.A.2.b), vehicle fueling, storage of fertilizers or ebcmiw{s, etc.
The location and deseription of may anticipated allowable sources of nor- starmwater disrh gt at the site, e.g.,
uncoaaminated springs, landscape irrigation rerun flow, construction dewateriog, and concrete washout.
The dmoc of the receiving watcr(s) and the size, type and Location of any outfal(s). If the stormwateo discharge is to
a municipal separate son m sewer system, the name of that system, tae location of the storm sewer discharge, and the
ultimate receiving water(s).
2. Site Man. The SWMP shall include a legible site map(s), showing the entire 540, identifying:
a)
b)
c)
d)
e)
1)
g)
h)
construction site boundaries;
all areas of ground surface disturbance;
areas of can sad flfl:
arras used for storage of haildiog materials, equipment, soil or waste;
locations of dedicated asphalt or concrete batch plants;
locations of al structural BMPs;
locations of nod - structural BMPS as applicable; and
locations of springs, streams, wetlands and other surface waters.
PART 1
Perna - Page 8
Permit Na COR- 030000
C. STORMWATER MANAGEMENT PLAN (SWMP) — CONTENTS (coat)
3. Stormweter Management Controls.
The SWMP must include a description of all smrmwater management controls that will he implemented as part o £the
ooashwction activity to control polltttants in mariners= discharges. The appropriateness and priorities of slwrnwater
management controls in the SWMP shall reflect the potential pollutant sources identified at the facility.
The description ofstomwater management controls shall address the following components, at a minimum:
a) SWMP Admhrtstrator - The SWMP shall identify a specific individual(s), position or title who is responsible for
developing, implementing, mehmairing, and revising the SWMP. The activities and responsibilities of the
administ amr shall address all aspects of the facility's SWMP.
b) Identification of Potential Pollutant Sources - All potential pollutant sources, including materials and activities, at
a site must be evaluated for the potential to eontnbute pollutants to smrmwa[c discharges. The SWMP shall
identify and describe those sources determined to have the potential to contribute pollutants to atormwater
discharges, and the sources must be controlled through BMP selection sad implementation, as required in paragraph
(c), below,
At a m�imum, each of the following sources and activities shall be evaluated for the potential to cootrbute
pollutants to etormwater discharges, and identified in the SWMP if found to have such potential:
1) all disturbed and stored soils;
2) vehicle tracking of sediments;
3) management of contaminated soils;
4) loading and unloading operasions;
5) outdoor storage activities (building materials, fertilizers, chemicals, etc.);
6) vehicle and equipment maintenance and fue ling;
7) significant dust or particulate generating processes;
8) routine maintenance activities involving fertilizers, pesticides, detergents, hale, solvenm, oils, arc;
9) - on-sue waste managemrnt practices (waste piles, liquid wastes, dumpaters, etc.);
10) concrete meek equipment washing, including the concrete truck chute and associated fixtures and equipment;
11) dedicated asphalt and concrete batch plants;
12) non- industrial waste sources such as worker trash and portable toilets; and
13) other areas or procedures where potential spills van occur.
c) Best Management Practices (BMPo) for Stormwaber Ponutian Prevention- The SWMP shall identify and
describe appropriate BMPe, including, but not limited to, those required by paragraphs I through g below, that will
be implemented at the fanilityto reduce the potential ofthe sources identified in Part I.C3.b to contribute pollutants
to storemelsr discharges. The SWMP shall clearly d&Scribe the installation and implementation specifications for
each BMP identified in the SWMP m ens sic proper implementation, operation and twiveaumce of the amp.
1)
The SWMP shall clearly describe and locate all
sruchiral practices implemented at the site to matimize erasion and sediment transport Practices may include,
but are not limited to: straw bales, wattles/sedimert control logs, silt fences, earth dikes, drainage swales,
sediment traps, subsurface drains, pipe slope drains, inlet protection, outlet protection, gabions, and temporary
or permanent sediment basins.
2) Non - Strumpet Practices for Erosion and Sediment Control. The SWMP shall clearly describe and locate, as
applicable, all non - structural practices implemented at the site to minimize aesion and sediment transport.
Description roust include interim and permanent stabilization practices, and site - specific scheduling for
implementation of the practices The SWMP should include practices to ensure that existing vegetation is
preserved whore possible. Nondbachral practices may Include, but are not limited to: temporary vegetation,
permanent vegetation, nulching, geotext iles, sod stabilization, slope roughening, vegetative buffm strips,
protection of Tees, and preservation of mmure vegetation.
C.
PART 1
Pettit - Page 9
Permit No. COR -030000
STORMWATER MANAGEMENT PLAN (SWMP)- CONTENTS (cont)
3) Phased BMP Smolementaaian. The SWMP shall clearly describe the relationship between the phases of
construction, and the impletnentation and maintenance of both structural and non- struewal stormwater
management controls. The SWMP must identify the statmwater management Controls to he implemented
during the project phases, which can include, but are not limited to, Bearing and grubbing; road construction;
utility and inftustrucnne hutallatioe; vertical construction; fmal grading; and foal stabilization.
4) Matcriats llaadlina and Spill Prevention. The SWMP shall clearly describe and locate all practices
implemented at the site to minimize impacts from procedures or sigtifiwat materials (see definitious at Part
L.£.) that could contribute pollutants to runoff. Such procedures or significant materials could include: exposed
storage of building materials; paints end solvents: fcutilircrs or chemicals; waste material; and equipment
maintenance or fueling procedures.
Areas orprocedures where potential spills can occur must have spill prevention and response procedures
identified in the SWMP.
5) Dtdit*lc l Concede or Asphalt Batch P1rmts. The SWMP shall dearly describe and locate all practices
implemented at rinc site to control stomtw .tc rpolla ion from dedicated concrete batch plants or dedicated
asphalt batch plants covered by this certification.
6) Vehicle Tracking Cord, The SWMP Shall clearly describe and locate all practices implemented at the site m
control potential sediment discharges from vehicle tracking. Practices must he implemented for all arras of
potential vehicle tracking, and can include: minimizing site access; street sweeping or scraping; tracking per;
gaveled parking areas, requiring that vehicles stay on paved areas on -site; wash racks; contractor education;
and/or sediment control BMPs, etc.
7) Waste Management and DisoosaL including Concrete Washout.
1) The SWMP shall clearly describe and locate the prances implemented at the site to control stotmvater
pollution from all construction site wastes (liquid and solid), including concrete washout activities.
ii) The practices used for concrete washout must ensure that these activities do not result in the contribution
of pollutants associated with the washing activity to stamwater runoff.
iii) Part ID.3.c of the permit authorizes the conditional discharge of concrete wasdsout water m the ground.
The SWMP shall ekarly describe and Isaac the practices to be used that will ensure that no washout
ware from roacrete washout activities is discharged from the site as surface runoff or to surface waters. '
8) Groundwater and Sterrawater Dewatetirsg.
i) The SWMP shah clearly describe and locate the practices implemented at the site to control stormwater
pollution from the dewatering of groundwater or stormwater from excavations, wells, etc.
ii) Pat LD.3d of the permit authorizes the conditional discharge of construction dewatering to the ground.
For any construction dewatering of groundwater not authorized under a separate CDPS discharge permit,
the SWMP shall clearly describe and locate the practices to be used that will tatsure that no groundwater
from coustruc0eu dewateting is disc-forged from the site as surface nntoff or to surface waters.
4. final Stabilization and Lene•term Stormwshr Management
a) The SWMP shalt clearly describe rite practices used to achieve fund stabilization of all disturbed areas at the sire,
and any ptazmed practices to control pollutants in stormwatcr discharges that will puce alter construction operations
have been completed at the site.
Is) Final stabilization practices for obtaining a vegetative rover should include, as appropriate: seed mix selection and
application methods; sol preparation and amendments; soil stabilization practices (cg., aeictpccd straw, hydro mulch
or rolled erosion conic products); and appropriate sediment control BMP5 as needed until Seal stabilization is
achieved: etc.
PART 1
Permit - Page 10
Permit No. COR -030000
C. STORMWATER. MANAGEMENT PLAN (SWMP) - CONTENTS (cent)
a) Final stabilization is reached when all ground surface disttabmg activities at the site have been completed, and
uniform vegetative cover has been estabbshed with asp individual plant density of at least 70 percent of pre-
disturbance levels, or equivalent permanent, physical erosion reduction methods have beep employed
The Division may, after consultation with the permittee and upon good cause, amend the final stabilization erneria in this
section for specific operations.
5. inspection and Maintenance
Part 1.D.6 of the permit includes requirements for site inspections. Part ID.7 of the permit includes requirements for BMP
maintenance. The SWMP shall dearly describe the inspection and maintenance procedures implemented at the site to
maintain all eon= and sediment control practices and other protective practices identified in the SWMP, m good and
effective operating condition.
D. TERMS AND CONDITIONS
1. General Limitations
The following limitations shall apply to all discharges covered by this permit
a) SLormwarer discharges from construction activities shall am cause, have Me reasonable potential to cause, or
measurably contribute to an exceedaace of any water quality standard, including narrative standstills for water
quality'•
h} Concrete washout water shall not be discharged to state surface waters erne storm sewer systems. On -site
permanent disposal of concrete washout waste is OSt authorized by this permit Discharge to the ground of concrete
washout waste that will subaequendy be disposed of of -site is authorized by this permit See Part ID.3.c of the
permit.
c) Bulk storage saucwres for petroleum products and any other chemicals shall have secondary containment or
equivalent adequate protection so as to contain all spills and prevent any spilled material from entering State waters.
d) No chemicals are m he added to the discharge unless permission for the use of a specific chemical is granted by the
Division. In granting the use of such cheminals, special conditions and monitoring may be addressed by separate
correspondence.
c1 The Division reserves the right to require sampling and testing, on a case-by-case bass, m the went that there is
reason to suspect thin compliance with the SWMP is a problem, or to measure the effectiveness of the BMPs is
removing pollutants in due effluent. Such monitoring may include Whole Effluent Toxicity testing.
f) All site wastes must be properly managed to prevent potential pollution of State waters. Ibis permit does not
authorize on-site waste disposal.
g) All dischargers must comply with the lawful requirements of federal agencies, municipalities, cormties, drainage
districts end other local agencies regarding any discharges of stotmwaterto storm drain systems or other Water
opuses under their jurisdiction, including applicable requirements in municipal slormwater management programs
developed to comply with COPS permits Dischargers must comply with local stormwater management
requirements, policies or guidelines including erasion sad =limit control.
2. BMP Implementation and Destmr Standards
Facilities mast select, install, implement, and maintain appropriate BMPs. following good engineering, hydrologic and
pollution coatol practices. BMPs implemental at the site must be adequately designed to provide control for all potential
pollutant sources associated with construction activity to prevent pollution or degradation of State waters.
?ART
Permit - Page 11
Permit No. COR-030000
D. TERMS AND CONDITIONS (court)
3. prohibition of Non -Storm cater Discharges
a) Except as provided is paragraaphs b, c, and d below. all discharges covered by this permit thnII be compeeed
entirely of dtormwater associated with eonstructioa activity. Discharges of material other than atormwater must
be addressed M a separate CDPS permit issued for that discharge.
b) Discharges from the following soUnies diet are combined with shnmwater discharges associated with construction
activity may he authorized by this permit, provided that the non- stormwater component oldie discharge is identified
in the SWMP (see Pan1.C.1.g of this permit);
• emergency fire fighting activities
- uncontaminated springs
- landscape irrigation return flow
c) Discharges to the ground of concrete washout water from washing of tools and concrete mixer chutes may be
authorized by this permit, provided that
1) the source is identified in the SWMP;
2) BMPs are included in the SWMP in accordance with Pan I.C.3(c)(7) and to prevent pollution of groundwater in
violation of Part LOW l.te and
3) these discharges do not leave the site as surface runoff or to surface wows
d) Discharges to the grand of water from conswction dewatering activities may be authorized by this permit,
provided than
1) the Marco is grmmdwater and/or groundwater combined with oormwater that does not contain poliumne in
concentrations cxceediag the State groundwater standards in Regalationa 5 CCR 100241 and 42;
2) the source is identified in the SWMP;
3) BMPs are included in the SWMP, as required by Pan I.C.3(cXg); and
4) those discharges do not leave the site as surface rural' or to surface waters
Discharges to the ground from constriction dewatering activities that do not mart the above criteria must be covered
under a separate CDPS discharge permit. Contaminated groundwater requiring coverage under a separate CDPS
discharge permit may include grotmdwazer contaminant with pollutants from a landfill, mining ectrvtty, industrial
pollutant plume, underground storage teak, or other source.
4. Releases in Excess of Reportable Oaantities
This permit does not relieve the paretittee of the reporting requirements of 40 CFR 110, 40 CFR 117 or 40 CFR 302. Any
discharge of hazardous material must be handled in accordance with the Divisions Noncompliance Notifltation
Requirement (see Part IIA3 dam permit).
5. SWMP Requirements
a) SWMP Preparation and Implementation. The SWMP shall be prepared prior to applying for coverage under the
general permit, and certification of ins completion submitted with the application. The SWMP shall be implemented
prior to commencement of ooastttetioe activities. The plan shall be updated as appropriate (see paragraph c,
below), below). SWMP provisions shall be implemented until expiration or inactivation of permit coverage.
h) SWMP Retention Requirements: A copy of the SWMP must be retailed on site unless another location, specified
by the ppmittcc, is approved by the Division.
c) SWMP Re Iew #Changes: The permitter shall ametM the SWMP:
1) when there is achange in design, construction. operation, or maintenance of the site, which would require the
implementation of new or revised BMPs; or
2) if the SWMP proves to be ineffective in achieving the geu0'al objectives of eonnolfmg pollutants in stormwater
discharges associated with constru.ction activity; or
PART
Permit • Page 12
Permit No. COR- 030000
D. TERMS AND CONDITIONS (cont.)
3) when BMPs are no longer necessary and are removed.
SWMP changes shall be made prior to changes in the site conditions, except 0e allowed for im paragraph d below.
SWMP revisions may include, but are not limited to; potential pollutant source identification; selection of
appropriate BMPs for site conditions; BMP maintenance procedure;: and interim and final stabilization practices.
The SWMP changes may include a schedule for further BMP design and implementation, provided that, if any
interim BMPs are needed to comply with the permit, they are also included in the SWMP and implemented during
the interim period
d) Responsive SWMP Changes'. SWMP changes addressing Bbfi' installation sod/or implementation are often
required to be made in response to changing conditions, or when current BMPs art determined ineffective. The
majority of SWMP revisions to address these changes canoe made immediately with quick in-the-field revisions to
the SWMP. la the less common scenario where more oomplex development ofmaterieiam modify the SWMP is
necessary, SWMP revisions shall be made in accordance with the following requirements:
1) the SWMP shall be revised as soda as practicable bat in ate rase more than 72 boars after the change(s) in
BMP installation teulio' implementation occur at the Site, and
2) a notation must be included in the SWMP prior to the site change(s) that includes the time and date of the
chooge(s) in the field, an identification of the BMP(s) removed or added, and the location(s) of those BMP(s).
6.
Site inspections must be conducted in accordance with the foIowmg requirements and minimum schedules. The required
minimum inspe room schedules do not reduce or eliminate the permidee's responsibility to Implement and maittam BMPs
in good and effective operational condition, and in accordance with the SWMP, which could require more frequent
inspections.
a) Nfmimum Inspection Schedule: The pennittee shall, at a minimum, make a thorough inspection, m accordance
with the requirements in 1.D.6.b below, at least once every 14 calendar days. Also, post -storm event inspections
must be conducted within 24 hours after the end of any precipitation or seowmelt event that causes surface erosion
Provided the timing is appropriate, the post -storm inspections may be used to fulfill the 14-day routine inspection
requirement. A more frequent inspection schedule than the minimum inspections described may be necessary, m
ensure that BMPs continue to operate as needed to comply with the permit The following conditional modifications
to this Minimum lospection Schedule are allowed'
1) Post-Storm Event Inspections at Temporarily Idle Sites — If no coastnsctioa activities will acct¢ following a
storm event, post -storm meat inspections shall be conducted prior to re- commencing coaswction activities,
but no later than 72 hours following the storm event. The occurrence of any such delayed inspection must be
documented is the Inspection record Routine iospecdons still mustise conducted at least every 14 calendar
days
2) Inspections at Completed Sites/Areas — For sites or portions of sites that meet the following criteria, but final
stabilization has not been achieved due to a vegetative cover that has pot become established, the permittee
shall make a thorough inspection of tbcir stortmvater management system at least once every month, and post-
storm event inspections are not required, This reduced inspection schedule is only allowed if.
i) all construction activities that will result is surface ground disturbance are completed;
0) all activities required for final stabilization, ice accordant with the SWMP, have been completed, with
the exception of the application of seed that has apt occurred due to seasonal conditions or necessity
for additional seed application to augment previous efforts; and
di) the SWMP has been amended to indicate those areas that will be inspected in accordance with the
reduced schedule allowed for in this paragraph.
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PART I
Permit - Page 15
Permit No. COR -030000
E. ADDITIONAL DEFINITIONS
For the purposes of this petmi1
1. Best Management Praetices (BAPS): schedules of actwiacs, prohibitions of practices, maintenance procedures, and
other management practices to prevent or reduce the pollution of waters of the State. BMPs also include treatment
requirements, operating procedures, pollution prevention, and practices to control site rusoff, spillage or leaks, waste
disposal, or drainage from material storage.
2. Dedicated asphalt plants and concrete plants: portable asphalt plains and concrete plants that arc located on or adjacent
to a construction site and that provide materials only to that specific construction site.
3. Final stabilization: when all grotmd surface disturbing activities at the site have been completed, and uniform vegetative
cover has been established with an indlviduel plant density of at least 70 percent of p¢a- dtatorbance levels, or equivalent
permanent physical erosion reduction methods have ban employed. Far pmpoaes of this permit, establishment of a
vegetative cover capable of providing erosion control equivalent to pre-es ti-sting conditions at the site will be considered
final stabilization
4. Municipal aeparate storm Bever system: a conveyance or system of conveyances (including roads with drainage
systems, municipal streets, catch basins, curbs, gutters, ditches, man -made charnels, w storm drains), owned or operated
by a State, city, town. county, district. or other public body (created by stale law), having jurisdiction over disposal of
sewage, industrial waste, storrmvater, or other wastes: designed or used for collecting or conveying stortnwater.
5. Operator. the entity thar has day-to -day supervision and control of activities occurring at the construction site. This can
be the owner, the developer, the general conmactar or the agent of one of these parties, in some circumstances. It is
anticipated that at diffetsst phases of aconstruction project, different types of parties may satisfy the definition of
'operator' and that the permit may be transferred as the roles clump.
6. Outfadl: a point soured at the point where sromtwater leaves the construction site and discharges to a recaving water or a
stormwater collection system.
7. Part of a larger common plan of development or sale: a contiguous area where multiple separate and distinct
eonsu coon activities may be taking ply at differenttimes oa ddfererx schedules.
0. Point soarer any discermblc, confined and discrete conveyance from which pollutant are or may be discharged Point
source discharges of stmmwater malt from structures which increase the imperviousness of the ground which acts to
collect nmoff, with nmoff being conveyed along the resulting drainage nr grading pattern.
9. Pollutant dredged spoil, dirt, slurry, solid waste, incinerator residue. sewage, sewage sludge, garbage, trash, chemical
waste, biological nutrient biological material, radioactive material, heat. wrecked or discarded equipment, rock. sand, or
may industrial. municipal or agricukural waste.
10. Process water any water which, during manufacturing or processing, comes into contact with or results from the
pmdneaon of any mw material, intermediate product, finished product by product or waste product This definition
includes mine drainage.
I ]. Receiving Water any classified stream segment ( including ributaries) in the State of Colorado into which starmwater
related 10 constrncbnn activities dischmges. This definition includes all water eoruees, even if they are usually dry, such as
borrow ditches, arroyos, and other trammed waterways.
12. Significant Materials include, but are not limited to: raw materials; fuels; materials such as solvents, detergents, and
plastic pellets; finished materials such as metallic prodoctc raw materials used in food Processing or production; hazardous
substances designated under section 101(14) of CERCLA; any chemical the facility is required to repot pursuant to
steno. 313 of tide 111 of SARA: fertilizers; pesticides; and waste produces such as ashes, slag and sludge that have the
potential to be released with smrmwater discharge.
13. Stormwater: precipitation - induced surface runoff.
PART I
Permit -Page 16
Permit No. CoR- 030000
F. GENERAL REQUIREMENTS
I. Signatory ReuidrementS
a) All reports required for submittal shall be signed and certified for accuracy by the petmittec in accordance with the
following criteria:
1) In the case of corporations, by a principal executive officer of a least the level of vice- president or his or her
duly authorized representative, if such representative is responsible for the overat1 operation oldie facility from
which the discharge described in the form originates:
2) In the case of a partnership, by a general partner,
3) In the case of a sole proprietorship, by the proprietor:
4) In the case of a municipal. stale, or other public facility, by either a principal executive officer, ranking elected
official, or other duly authorized employee, if such representative is responsible for the overall operation of the
facility from which the discharge described in the form originates.
b) Changes to authorization. Ha) authorization under paragraph a) of this section is no longer acensaee because a
differed individual or position has responsibility for the overall operation of the facility, a new authorization
satisfying the requirements of paragraph a) of this section moot be submitted to the Division, prier to or together
with any ripe, s, information, or applications to be signed by mm authorized representatve.
c) Certification. Any person signing a doelment under paragraph a) of this section shall make the following
certification:
^I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, 00
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. 1 am aware that there are significant penalties for
submitting false in formation, including the possibility of fine and imprisonment for Imowing violations.'
2. Retention of Retards
a) The peratittee shall retain copies of the SWMP and all reports required by this "omit aad records of all data used to
complete the application to be covered by tins permit, for three years after expiration or inactivation of permit
coverage.
b) The permeate shall retain a copy of the SUMP required by this permit 01 the construction site from the date of
project initiation to the date of expiration or inactivation of permit coverage, unless another location, specified by
the permitted is approved by the Division.
3. Muaitorine
The Division reserves the right to require sampling =dusting, on a case -by -case basis (see Part 1.D.l.e), for exampie to
implement the provisions of a TMDL (see Part 113.11 of the permit). Reporting procedures for any monitoring data
collected will be included is the notifica loo by the Division of monitoring requirements.
If monitoring is required, the following deflations apply:
a) The thirty (30) day average shall be determined by the arithmetic mean of all samples collected during a thirty (30)
coruautive -day period.
A grab sample, far mvnitoriog requirements, is a single "dip and take" sample.
b)
PART 1I
A. MANAGEMENT REQUIREMENTS
I. Amendinea Permit certification
The permittee shall inf the Division (Permits Section) in writing of changes to the information provided in the permit
application, including the legal concoct, the project legal description or map originally submitted with the application, or
the planned total disturbed acreage. The permittee shall furnish the Division with any plans and specifications which the
Division deems reasonably necessary to evaluate the effect on the discharge and receiving stream. If applicable, this
notification may be accomplished through submittal of CO application for a CDPS process water permit authorizing the
discharge. The SWMP shall be updated and implemented prior 12 the changes (See Pan
Any discharge to lice waters of the State from a point source other than specifically authorized by this permit or a different
CDPS permit is prohibited.
2. Special Notifications -Definitions
a) Spill: An tminteulional release of solid or liquid material which may cacao pollution of state waters.
b)
Upset An exceptional incident in which there is unintentional and temporary noncompliance with permit discharge
limitations because of factors beyond the reasonable control of the permittee. An upset does not include
noncompliance to the axle& caused by operational error, improperly designed treatment facilities, inadequate
treatment facilities, lack of preventative maintenance. or careless or improper operation.
3. Noncomoliancn Natifeatior
a) The permittee shall report the following i Shelves of noncompliance:
1) Any noncompliance which may endanger health or the environment
2) Any spill or discharge of hazardous substances or oil which may cause pollution of the warns of the stele.
3) Any discharge of stormwater which may cause an exceedance of a water quality standard.
b) For all instances of noncompliance based on environmental hazards and chemical spills and release, all needed
information must be prvvided orally to the Colorado Ow. c ,nt of Public Health and Environment spll3 reporting
line (24 -hour number for environmental hazards mod chemical spills and release 1.877.515 -5608) widtia 24 hours
from the time the permitter becomes aware of the circumstances.
For 211 other instance of noncompliance as defined in this section, all needed information must be provided orally to
the Water Quality Control Division within 24 hours from the time the permittee becomes aware of the
circumstances.
For all instances of noncompliance identified here, a 'minim submission shall also be provided within 5 calendar
days of the time the prrmittee becomes aware of the circumstances. The written submission shall contain a
description of
1) The noncompliance and its cause;
2) The period of noncompliance, including exact data and times, and if the noncompliance has not been
corrected, the anticipated time it is expected to continue;
3) Steps takes or plumed to redact, eliminate, and prevent reoccurrence of the noncompliance.
A. MANAGEMENT REQUIREMENTS (cont.)
4. Sobmisslgflof Irt.orr or In=mpIORClnformatlan
Where the pennittee failed to submit any relevant facts m a permit application, or submitted incorrect information in a
permit application or report o the Division, or relevant new information becomes available. the pnmtttee shall promptly
submit the relevant application information which was not submitted err any additional information needed to correct any
erroneous information previously submitted.
5. Byoass
a) A bypass, which =Uses effluent limitations (Le., requirements to implement BMPs in accordance with Parrs I.13.3
and I.D2 of the permit) to be exceeded is prohibited, and the Division may take mforc=eot action against a
permittee for such a bypass, mdess:
I) Bypass was unavoidable to prevent loss of life, personal injury, or severe property damage;
2) There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities (c.g.
alternative BNIPs), retention of untreated wastes, or naamtenance during normal periods of equipment
downtime. This condition is not satisfied if the permitrx could have installed adequate backup equipment (e.g.,
implemented additumal BMPs) to prevent a bypass which occurred during normal periods of equipment
dawatime or preventative maintenance; and
3) The penmttee submitted notices as required in "Non- Compliadce Notification," Part A.A.3.
6. Uosets
a) Ef( t of an Upset An upset constitutes as affirmative defense to an action brought for noncompliance with permit
limitations and requirements if the requirements of paragraph b of this section me met. (No determination made
during administrative review of claims that noncompliance was mused by upset, and before an action for
noncompliance, is final administrative action subject to judicial review)
b) Conditions Necessary for a Demonstration of Upset: A permittee who wishes to establish the affirmative defense
of upset shall demonstrate through properly signed contemporaneous operating logs, or other relevant evidence that
1) An upset occurred and that the permittee can identify the specific cause(s) of the upset
2) The peraitted facility was at the time bang properly I
3) The pempittee Submitted notice of the apses as required in Part 11A3. of this permit (24 -boor notice); and
4) The pe:miltee complied with any remedial measures required under 40 CFR Section 122.41(d) of the federal
regulations or Section 61.8(3)(h) of the Colorado Discharge Permit System Regulations.
c3 Burden of Proof: In any enforcement proceeding the permit-tee seeking to establish the occurrence of an upset has
the burden of proof.
7. Removed Substances
Sobda, sludges, or other pollutants removed in the cease of treatment or control of discharges shall be properly disposed
of in a manner such as o prevent any pollutant from such materials from =Whig waters of the State.
J llhlmh atfon ofAdverse Dsma,q
8.
The pumites shall rake all reasonable steps to minimize any adverse impact to waters of the State resulting from
noncompliance with any terms and conditions specified in this permit, including such accelerated or additional monitoring
as necessary to determine the name and impact of the noncomplying discharge.