HomeMy WebLinkAbout1.05 Stormwater & SPCCPStorm Water Management Plan
For
North Parachute Ranch
Garfield County, Colorado
March, 2005
Prepared for:
EuCana Oil & Gas (USA) Inc.
Prepared by:
CORDIL:LE1AN
Cordilleran Compliance Services, Inc
826 21 '/2 Road
Grand Junction, Colorado 81505
NPR SWMJ En Cana
TABLE OF CONTENTS
1.0 INTRODUC:TION
1.1 S Writ I Water Runoff- Permitting Requirements. . 1
1.2 Project Description and Background 2
1.3 Project Owner and Operator
2.0 CONSTRUCTION SlTE DESCRIPTION 3
2.1 Site Location and Construction Area Description
2.2 Schedule of Construction Activities 4
2.3 Runoff Characteristics 4
2.4 Threatened and Endangered Species and Fistorie Places
3.0 POTENTIAL POLLUTION SOURCES . 5
4.0 DESCRIPTION OF CONTROT„ MEASURES 6
4.1 Soil Erosion and Sediment Controls 6
4.1.1 Uphill topsoil stockpile/diversion berm 6
4.1.2 Downhill silt fence 6
4.1.3 Woll'pad surfae e. graded to drain to reserve pit 7
4.1.4 Hay bale check dams 7
4.1.5 Rock check dams 7
4. I .6 Road drainage relief 7
4.1.7 Culvert inlet and outlet protection 7
4.1.8 Soil Berms 8
4.1.9 Temporary seeding of pads in the drilling configuration 8
4.1.10 Permanent seeding of pads in the long-term production configuration8
4.1.11 Seeding of other disturbed areas ........ ................. ..... 9
4.2 -Storm Water Management Controls 9
4.3 Other Controls 9
4.3.1 Waste management and disposal 9
4.3.2 Fuels and Mater ial s management 10
4.3.3 Construction Site Housekeeping 11
5.0 INSPECTION AND MAINTENANCE PROCEDURES 12
6.0 NON-STORMWATER DISC' I ARGES 14
7.0 CERTIFICATIONS 15
7.1 Owner/Applicant Certification 15
7,2 Contractor/Subcontractor Certification 15
LIST OF SWIVIP REVISION DATES 17
NPR SWivfP En Cana
Figure I
Figure 2
1.,[S`1' or I IGtM ;S
Well I Pad Locations
Typical Well Pad lap-nit with Storm Water Controls
LIST OF TABLES
"['able 1 'Well Pads and Estimated Schedule of Activities
{'table 2 Summary of Soil Types at Well fads
Table 3 NRCS Soil Survey Plant Communities
LIST OF APPENDICES
Appendix A North Parachute Ranch Storm Dater Permit
Appendix B Typical Storm Water BIVIP Details
Appendix C Specific Well Pad and Facility Layouts with Storm Water Controls Noted
and Storm Water Inspection Fort»
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NPR SWMP EnC ana
1.0 INTRODUCTION
This Storm Dater Management Plan (SWMP) is writicn to comply with the Colorado
'Department of Public Health and Environment's (C1)1'1I13) General Permit No. COR-
03000 issued on June 30, 2002 and will expire on June 30, 2007, and related U.S.
1 nvirorunental Protection Agency (USE PA) National Pollutant Discharge Elimination
System (NPl)1?S) storm water regulations. This SUMP addresses construction and
drilling activities associated with development of the natural gas resource on the North
Parachute Ranch property, This SWMP is intended to address storm water nranagcrncnt
at all disturbed areas within the North Parachute Ranch (NPR) property and will he
periodically updated as needed to address planned developments, new disturbances, and
other changes needed to manage storm water and protect surface water quality.
Sturm water permit certification was .issued by the Colorado Department of Public Health
and .Environment as COR- 037689 on January 27, 2005. The permit is included as
Appendix A.
The intent of this SWMP is to be a dynamic document that is updated throughout the
project life. As development progresses and new disturbed areas are plarared this SWiv1P
will be updated; this is likely to occur every 2 to 3 months during 2005 and 2006. A list
of revision dates is included as the last page of this SWAP. Updates will include:
1. inclusion of newly proposed activities that will result in ground disturbance,
2. Revision of existing BMPs as needed to address sediment control, and
3. Deletion or BMPs and reduction in monitoring frequency for individual facility,
locations where interim and long -torn vegetation have bcctr successfully
established.
1.1 Storna Water Runoff Permitting Requirements
The f=ederal Clean Water Act [Section 402(p)i requires that discharges of pollutants to
waters of the United Station from any point source he regulated by NPDES permits. in
November 1990 the USLPA published final regulations that established application
requirements ibr 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 permit.
in December 1999 the t.J51;PA published final Phase 11 NPDES regulations that
established application requirements for storm water associated with construction activity
for soil disturbances to be regulated as an industrial activity and covered by an NPDES
permit. 'I'hcse rcgulatiou &becanaoeffecti±voJuly 1, 2002.
Construction permits are required for oil and gas activities that disturb 5 or more acres
during the life of the project or are part of a larger common plan of development.
CDP] -IF, considers a common plan of oil and gas development to mean development of
several well pads and/or related infrastructure in a contiguous area either during the sank;
time period or under a consistent plan for long -term development.
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NPR SWMP EnCana
12 Project Description and Background
The North Parachute Rauch (NPR) property includes approximately 27,000 acres that
was originally patented by Unocal for oil shale recovery. EnCana Oil. & Gas (USA), lnt :.
(EnCana) is the current owner and is actively engaged in developing the .:natural gas
resource. Currently there are 26 well pads planned to be constrnetcd with associated
drilling operations occurring on these pads from the current date through the spring of
2005. Approximately 6 additional well pads will likely be constructed later in 2005 and
in 2006. The locations of the first 26 currently planned well pads are shown on Figure 1.
The current drilling and development plan includes pad construction. access road
improvement/construction, pit construction, installation of associated facilities, well
drilling, well completion, well testing, and pipeline construction. As drilling proceeds
and Ar €rlitior�.al w iI pads, gas gathering and processing facilities are installed this 5 WMP
will he modified to include these locations.
A complete set of site reaps of currently planned facilities that will be constructed in the
near --term (2004 and 2005) is provided in Appendix 13.
13 Project Owner and Operator
The property owner and operator is FnC.ana. Their address is:
EnCana Oil & 3u (USA), Inc.
370 17th Street, Suite 1700
Denver, Colorado 80202
Ph (303) 260 -5000
Fax (720) 876 -6030
The EnCana contact person for the project is Brant Cimrneson. Mr. Gimrneson can be
contacted by phone at (720) 876 -5030 or on cell phone at (303) 819 -7323. EnCana will
be in charge of all aspects of the property and this project. Contractor(s) will do the
actual construction and drilling but all work will be supervised by EnCann and all
decisions will he made by EnCana.
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NPR SWMP ! nC na
2.0 CONS] l:ION SITE DESCRIPTION
2.1 Site Location and Construction Arca Description
1snCana acquired the NPR properly through acquisition of Tom Brown lac. (`JBI) in
2001. There are currently 26 well pads that have been constructed or will be constructed
within the next 6 months within the NPR, located north of Parachute, Colorado (sec
Figure 1). The 26 well pads along with their major activities and estimated dates of
major work phases are listed in'1`ahle 1,
Well pads will be constructed using conventional cut and fill eKarthnrov.ing techniques and
now access roads will connect the well pads to existing roads. Typically, the working
pad surface will have dimension of approximately 200 feet by 400 feet, Each pad will
have a reserve pit that is approximately 60 feet by 250 feet, A typical well pad is shown
on Figure 2. Specific pad dimensions vary depending on the planned drill rig, number of
wells to be drilled from each pad, and local conditions. The drilling reserve pit will be
used during drilling liuld drilling fluids and cuttings. The reserve pits will be; designed,
constructed, and reclaimed according to Colorado Oil and Gas Conservation Commission
(COGCC) requirements,
The drilling surface of the well pad will be graded at approximately 1 percent to drain
toward the reserve pit. This drainage pattern will help ensure that stores water runoff and
spilled liquids remain on, the pad.
In areas that arc; disturbed by well pad construction, topsoil will be stripped and
stockpiled near the site. Topsoil stockpiles will be seeded as soon as practicable to
preserve the topsoil resource. Soil materials will be managed so that erosion and
sediment transport are minimized. Nearby drainages will be protected by appropriate
.measures. The well pad will he graded to drain the pad surface to the reserve pit and to
direct runoff from surrounding areas away from the well pad and reserve pit.
Drilling a natural gas well typically requires 5 to 10 days with subsequent completion
taking un additional 5 to 10 days. Testing of completed wells may take from 2 weeks to
4 months. If acceptable production is achieved, the wells will be shut -in until gathering
lines and production facilities are constructe=d. The drilling pad will be graded to reduce
the pad surface arca to approximately 1 acre and to reduce cut and fill slopes in
approximately 211:1v (horizontal: vertical). Access roads will remain in place for well
operation and rnairrttenance -at tIvitics.
If all wells on a pad are not productive, the wells will he plugged according to COGCC
rules and the pad arca. reclaimed to approximate pre - construction Contours. Reclamation
and final stabilization will be conducted as described in Section 4. Note that the
proposed well pads contain from 4 to 8 wells and it is considered unlikely that all wells
on a given pad will he non- prcxluctive.
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NPR SW.MP EnCana
The Central Yard (Middle Fork Compressor station) will ultimately he the site of gas
processing, compression, and other support facilities. The final configuration attic
Central Yard will include drainage features to divert runon away from the site and to
collect and direct run -of to a storm water sk rage pond. A preliminary grading, plan with
construction phase storm water I3MPs indicated is included in Appendix C.
2.2 Schedule of Construction Activ =ities
Natural gaa exploration and development activities arc currently underway at the NPR.
Existing and currently planned well pads are included in this S \'VMI'. Currently, soil at
the project area is frozen therefore, storm water BMPs will be installed as ground
conditions allow. For well pads that will he constricted net year, HMI's will be
installed prior to, during, and immediately following construction as practicable.
Development of the natural gas resource and construction of necessary improvement on
this property will likely continue for the next 3 to 5 years. Recovery cif natural gas from
these constructed facilities will most 'likely continue for the next 50 years, or more.
2.3 Runoff Characteristics
Runoff characteristics are based on site topography, soil type, and soil/vegetative cover,
Surface elevation ranges from Approximately 6,000 to 8,500 feet. Surface soils range
from alluvial sandy silts rind clays to exposed bedrock, Slopes range from 1 to over 100
percent. Currently proposed well pads are typically on alluvial valley floors to alluvial
funs. Soils at proposed well pads range from sandy silts to silty sands with gavel.
Pmposcd well pads are located on fitNiS that have slopes ranging from 5 to 45 percent.
Soil types at each proposed well pad are listed in Table 2.
2.4 Threatened and Endangered Species and Historic Places
EnCana has retained a wildlife biologist to canduct surveys and make recommendations
regarding wildlife management on the property. EnCana has retained plant biologists to
conduct a wetlands survey, the wetlands identification mapping has been completed.
Currently no activities or work areas are planned to he located within potential wetlands.
'EnCana has retained an archeologist to conduct a cultural resource inventory of the
property.
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NPR SWMP i::nCfina
3,0 POTENTIAL POLLUTION SOURCES
Potential poi tition sources associated with construction sites and natural gas development
include
• Sediment resulting from erosion of soil stockpiles and other areas cleared of
vegetation;
• l,,eakkagc of fuels and lubricants from equipment and spills from fueling;
• Trash and debris from clearing activities, construction materials, and workers;
• Drill cuttings and drilling fluids;
• Well completion fluids; and
• Produced Ivatcr_
The most cotnmotn source of pollution from drilling sites is sediment, which can he
carried away from the work site with storm water rtrnoff`and impact the water quality of a
receiving stream. Clearing, grading, and otherwise altering previously undisturbed land
can inerease the rate of soil erosion over pre - disturbance rates.
Petroleum products can &so be potential storm water pollutants. These products are used
in construction and drilling activities to power or lubricate equipment and include: fuel,
gear oil, hydraulic oil, brake fluid, and grease.
Debris from taydown areas, residue fro.rn equipment cleaning and maintenance, and solid
waste generated from land clearing operations and human activity (trees, bnish, paper,
trash, etc) present other potential pollution sources within the construction site. Other
materials on -site will include compressed gasses used in welding and chemicals used and
stored on -site for use in drilling and well completion.
Drill cuttings and drilling fluids are generated during well construction. These will be
placed in the reserve pit during drilling operations. Although a spill of these materials is
unlikely to occur, these llnicls can he potential storm water pollutants.
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NPR SWMP 3nCa »a
1.0 DESCRIPTION OF CONTROL MEASURES
nl_ 1 Soil Erosion and Sediment Controls
Me 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 erosion and sediment controls to be used at
active construction sites to minimize possible sediment impacts 10 storm water runoff.
The proposed erosion control features include:
• Placement of the topsoil stockpile at the. upstream edge of well pads to divert run -
or);
• 1 €rstallatkm of silt fence at or below the toe of fill slopes where located within 100
feet of surface water drainages or where steep slopes will likely result in rapid
drainage from the location to nearby drainages;
• Grading well pad surfaces to drain toward the reserve pit;
• Installation of check dams in areas of concentrated flow;
• "Temporary seeding of well pads that will rerr €ain in the drilling configuration
through winter; and
• Permanent seeding ofwcil pads where all wells have been drilled, completed,
production facilities installed, and the pad slopes have been regraded to the long-
term, production configuration.
'l'Ite types and. locutions of structural T4MPs for well pads listed in "fable 2.1 are shown on
the well pad plats in Appendix C.
4.1,1 l.Jphill topsoil stockpile /diversion berm
In order to divert surface runoff from upgradient areas away from well pads, salvaged
topsoil will be placed on the uphill side of the well pad cut slope. The topsoil stockpile
will be placed and graded to foram a diversion berm that will direct surface water away
from the well pad. A typical well pad layout is shown on figure 2.
4.1.2 Downhill silt fence
Silt fence will be installed at the toe of well pad and other fill slopes located within 100
feet of a surface drainage, Silt fence may also be rcqu)red in areas where steep slopes
below the site will likely result in fast flow of water from the location to nearby
drainages. A typical well pad layout is shown on Figure 2. Typical silt fence installation
details are given in Appendix 13.
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NPR SWMP EnCana
4,1.3 Well pad surface, graded to drain to reserve pit
la order to retain stoma water on the well pad and to help contain incidental spills and
leaks; the well pad surface will be guided at i% to drain toward the reserve pit. A typical
well pad layout is show, on Figure 2.
4.1.4 lIay bale check dani
flay bale check dams, at a mirtillaum will be installed in areas of concentrated flow. A
typical installation location is shown on the typical well pad layout. (Figure 2). Hay bale
check dams should also be installed at suitable locations along new access roads. Typical
hay hale check dace installation details are given in AApendix B.
There are several culverts with drop inlets near the East Fork access road. Due to
potential erosion. from the road and nearby pipeline disturbance, these inlets should be
protected by hay bale structures. The hay bale inlet protection detail in given in
Appendix B.
4.1.5 Rock check dams
Rock check darns will he installed in areas of-concentrated flow. Rock check dams may
be used instead of hay bale cheek dams in areas where steep slopes, high flows, or long-
term exposure are expected to result in failure or frequent maintenance of a hay bale
structure. Typical hay bale check dam installation details are given in Appendix I3,
4,1.6 Road drainage relief'
Culverts, rolling dips or water bars may be used to provide drainage of water from road
surfaces as needed to drain low areas or to reduce the amount of water flowing on the
road surface, Road drainage relief should be provided as needed and in. accordance with
generally accepted practices. Guidance for road drainage relief is available in the
document "Low- Volume Roads Engineering, Best. Management Practices Field Guide,"
developed by the U.S. Forest Service and available on -line at
httarihvww .blinj!,ovjh!uJYljeld %320010. ht.m. Depending on the location and type of
drainage relief installed, additional sediment control features may be needed such as
sediment removal at the inlet and erosion protection at the outlet,
4.l .7 Culvert inlet and outlet protection
Installation of culverts may be needed in certain areas where access roads intersect
intermittent drainages. 'the culvert inlet area will include a sediment sump that is at least
1 feet by 4 feet by 1.5 feet deep. The culvert outlet area will include an energy
dissipation feature. Acceptable energy dissipation will include rock lining or turf
reinforcement matting (FRMj. Rock lining will be 2- to 4 -inch diameter rock at least 6
inches deep and having plan dimensions of at least 4 feet wide by 10 feet long.
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NPR SW MP EnCana
The area o €'rock lining should be prepared by removing 6- to 8 inches of soil. The
shallow excavation should be filled with rock and the rock secured in -place by bucket
tamping or wheel - rolling. The ruck outlet should he installed to promote lateral
spreading of water as it flows across the rock_
4,1,8 Soil Berms
Soil berms may be used to divert drainage away from areas of concern or to direct flow
toward sediment control structures. Where used, soil beams shall he constructed of soil
with sufficient fines to minimize flow through the berm. Berms shall be at least l8-
inches tall and will he compacted in place by wheel rolling with suitable rubber tired,
heavy equipment.
4.1.9 "Temporary seeding of pads in the drilling configuration
Well pads at the NPR generally contain from 4 to 8 wells. Given the estimated 1 year or
more between pad construction and stabilization ;trading and vegetation; temporary
seeding of cut and fill slopes and all disturbed areas that will not he used for work
activities should be seeded. 'lids temporary seeding; will not only help reduce erosion hut
will help avert the colonization and spread of invasive and noxious weeds. Establishment
of vegetation on topsoil stockpiles is critical as this will help maintain viability of the
topsoil resource. Segregation of topsoil material and replacement of topsoil in its
respective original position (last out, first in) would assist in the reestablishment of soil
health and productivity_
The temporary seed triix should include annual, cereal crop seeds such as oats or barley
and suitable grass species. Crass seed will be included in the seed mix to provide
sustainable vegetative cover in the event that a well pad remains in the drilling
configuration for longer than one year. he temporary seed mix, rate, application
method, and supplemental materials will be determined by the revegetation contractor.
4.1.10 .Permanent seeding of pads in the long -term production configuration
After drilling of all wells and installation of associated production facilities (storage
tanks, ureters, pipelines, etc.) the well pads will he partially reclaimed to reduce the cut
and fill slopes. The well pad will remain in this configuration for the useful and
economic life of the gas wells, approximately 40 years. To best provide for long -term
vegetation-of these- well-padsthey should be veget ;rtc:dlhrotigh_applicatiorwf a
permanent seed mix. A list of suitable plant types is derived from information in the
MRCS soil surveys and is given in Table 3.
The permanent seed mix, rate, application method, and supplemental materials will he
selected by the revegetation contractor,
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