Loading...
HomeMy WebLinkAbout1.31 Storm Water & Soil Management Plan 10.23.2008Site - Specific Storm -Water / Soil Management Plan Page 1/5 Site Name: Well Pad 35 -BV Date of Plan: October 23, 2008 Rev. 1 1. Site Activity ! Description Background Information: Information provided in this document is intended to supplement the existing Skinner Ridge Storm Water Management Plan. This document specifically addresses the requirements for the Well Pad (WP) 35 -BV. Site Purpose: WP 35 -BV will be used for multiple purposes to support the natural gas field operations, including drilling up to 22 directionally wells, primary liquid / gas separation equipment, placement of hydraulic fracturing equipment and associated fracturing (frac) tanks, and ancillary equipment required to extract raw natural gas from the wells and convey it to the to the CPF (see Drawings PBSR-598358VW- PIP- PLN -URS- 00000- 00002 -00 and PBSR- 59835BV -C IV -S KT -URS- 00000- 00002). Well drilling and fracing and natural gas extraction activities will be regulated by and take place under the administration of the Colorado Oil and Gas Conservation Equipment (COGCC). Remaining space on the well pad will be used to locate the water management systems, that include a water distribution system, temporary Stage 2 water system, water management tanks, and a water management tank pump system. The temporary water management systems will operate by pumping produced water from the CPF to WP 35 -BV where it will be stored in ten (10) 500 barrel (bbl) (21,000 gallon) frac tanks. Pumping to the frac tanks from the CPF will occur on a batch basis. From the frac tanks, the stored produced water will be pumped through 10 micron filters and subsequently be stored in two 500 bbl, vertical "clean" tanks, also on a batch basis. Produced water will be pumped from the "clean" tanks through a four inch pipeline, approximately 5 miles, to Well 8 -1 for injection disposal. The following details pertain to the temporary water management systems: • All pumps will be trailer mounted and diesel engine powered • The injection pumps will be equipped with high pressure shutdown devices • The operating status of all pumps will be monitored in the CPF control room • Liquid levels in the "clean" tanks will be monitored in the CPF control room • The volume of produced water injected into Well 8 -1 will be measured at WP 35 -BV • The volume of injected water and casing -head pressure will be recorded at Well 8 -1. The area surrounding the ten frac tanks, clean tanks and pumps will be enclosed by a small earthen containment berm. A trench will be formed to route any spills collected in the berm to the existing on -site, lined liquids pit. Liquids collected in the lined pit will be removed for disposal by vacuum truck or re- introduced into the frac tanks for disposal. Once the permanent water management systems are permitted, constructed and commissioned the temporary storage equipment (frac tanks) will be removed from WP 35 -BV. The CPF removes the remaining water and condensate (a blend of low- density hydrocarbons) from the extracted natural gas (which is not removed by the on pad primary separation equipment) prior to gas transfer into the Program 30 -inch sales pipeline. Condensate removal is necessary to prevent pipeline multiphase flow problems and to collect the valuable commodity for sales (source of propane, butane, pentane and heavier hydrocarbon fraction). The water must be removed to prevent corrosion and hydrate formation in the pipelines and to prevent the multiphase flow problems. Site Location: The proposed facility will be located about 0.1 miles west of an existing intersection of two ranch roads near the confluence of Clear Creek and Tom Creek (see Maps - Figure 2). The intersection is located about 2.5 miles north northwest of the end of County Road (CR) 211. The site can be accessed from Interstate 70, exit 62, by traveling north on local Road 45N. Road 45N north of De Beque, Colorado, is also known as Roan Creek Road /Drive and CR 204 (Garfield County). The intersection of CR 211 and CR 204 is located about 12.5 miles north northwest of De Beque and this facility can be accessed by continuing north on CR 211. Site Area /Disturbed Area: WP 35 -BV would occupy about 3.4 acres. A general coordinate for the facility is 39 °34'19.77 "N latitude, 108 °21'0.18 "W longitude NAD 831 WGS 84. The total footprint of WP 35 -BV area will be about 3.4 acres, which was previously disturbed during the installation of the existing Skinner Ridge Service Pad 598 -35 -BV (Service Pad). The new WP 35- BV will be positioned on the existing Service Pad. Because the area needed for WP 35 -BV and the water management systems was previously developed (graded, etc.) heavy equipment use will be limited to building foundations and installing and connecting the water distribution systems, tanks, filters, and pumping components. This heavy equipment may include but not be limited to trucks and flat -bed trailers; dump trucks; loaders; bull dozers; backhoes; graders; scrapers; rollers; water suppression tank trucks; and cranes. This equipment may be operated 24 -hours per day, 7 days a week. General Topography: The WP 35 -BV site lies in the Douglas - Plateau area. it consists of narrow foothills valleys, high rolling plateaus dissected by steep canyons, narrow mountain valleys, and high mountains. The area of exploration and production is mostly rangeland, with the primary limitations for grazing being steep slopes, short growing season, rockiness, and limited water. Geology: The underlying rocks are relatively late geologic age, mostly from the Cretaceous or Tertiary periods. They range from hundreds to thousands of feet in thickness and are generally tilted and unfolded. The formations commonly extend of broad areas. Site - Specific Storm -Water / Soil Management Plan Page 2/5 Site Name: Well Pad 35 -BV Date of Plan: October 23, 2008 Rev. 1 Property elevations vary from 5,800 ft (valley floor) to 8,500 ft (Roan Plateau). The Roan Plateau extends north into Rio Blanco County, and surrounds the Skinner Ridge development site. The Roan Plateau consists of the generally stable Green River Formation. Site Soils / Slopes: The dominant soil type is Cumulic Haploborolls, a soil series that is placed in the hydrologic soil group B. Cumulic Haploborolls soils having a moderate infiltration rate when thoroughly wet and consist chiefly of moderately deep or deep, moderately well drained to well drained soils with moderately fine to moderately coarse texture. These are alluvial soils with a moderate rate of water transmission. WP 35 -BV area slopes range from to 1 to 4 percent. Information published by the National Resource Conservation Service (NRCS) describes the area soils as deep, well to poorly drained, formed in alluvium dominated mostly by the Green River and Wasatch shale formations. The NRCS information details a surface layer of dark grayish brown gravelly sandy clay loam about eight inches thick, followed by about 12- inches of grayish brown very channery sandy clay loam. The subsoil is grayish brown clay loam about eight inches thick The upper part of the substratum is light brownish gray very gravelly loamy sand about 16 inches thick, while the lower part of the substratum to a depth of greater than 60 inches is a yellow very gravelly sand. In some areas the surface layer is loam or silty clay loam. Permeability is moderate to moderately slow. And runoff is generally slow; the hazard of water erosion is slight. These soils are subject to brief periods of flooding as a result of snowmelt and intense thunderstorms in the spring and summer. Preliminary geotechnical information indicate that the site is covered with about one foot of topsoil (that will be stockpiled) with about 10 feet of underlying medium to stiff clay with shale fragments (Unified Soil Classification System soil classification CL / SH). The erodability of the soil based upon Revised Universal Soil Loss Equation Version 2 (RUSLE2) is 0.17 for the Kf (the susceptibility of the surface horizon to sheet and rill erosion by water) and 3 for the T factor (the estimate of the maximum average annual rate of soil erosion by wind and /or water that can occur without affecting crop productivity over a sustained period (rate is in tons per acre per year). Receiving Waters and Hydrology: Storm -water runoff from construction activities will potentially flow south - southwest towards Tom Creek, a tributary to Clear Creek and / or Clear Creek, Segment 14b of the Lower Colorado Sub -basin and Basin (Regulation 37, Standards for the Lower Colorado River Basin). Clear Creek is a tributary of Roan Creek, which ultimately flows to the Colorado River. The saturated zone in portions of the area is about 54 inches depth to water, primarily due to the close proximity to Tom Creek and Clear Creek. Existing Vegetation: Site is currently vegetated with grasslands used for cattle grazing. Western Wheatgrass (Pascopyrum smithii), Basin Wildrye (Leymus cinereus), and Basin Big Sagebrush (Artemisia tridentate) are common in this area, which is bordered on the north, east and south by riparian woodlands. Dominant observed trees in the area were Boxelders (Acer negundo L.), and the introduced and naturalized New Mexico Locust (Robinia neomexicana). Observed noxious weeds in the area include Bull Thistle (Cirsium vulgare), Common Mullein (Verbascum thapsus), Downy Brome or Cheatgrass (Bromus techtorum), Musk Thistle (Carduus nunfans), Houndstongue (Cynoglossum offcinale), and Tamarisk (Tamarix ramosissima). Tamarisk sp. is primarily confined to the Clear Creek channel. Weed control will be part of the ongoing site reclamation plan. Description of Construction Activity: Because the area that will be used as WP 35 -BV was previously disturbed during the installation of the existing Skinner Ridge Service Pad 598 -35 -BV (Service Pad) construction activities at site will be limited, but may involve grubbing, removal and stockpiling of topsoil, followed by cut and fill operations necessary to construct and install the needed facilities. Details of the pad construction can be found on Drawings PBSR- 598358VW- PIP -PLN -URS- 00000 - 00002 -00 and PBSR- 59835BV-C IV-SKT- URS - 00000 - 00002). Prior to any earth moving, erosion control BMPs will be installed to minimize site erosion and sedimentation. BMPs will be installed and maintained throughout the initial, interim, and final grading stages. Initial and interim grading activities will include the construction of the facility. Final grading will be completed after the completion of the installations to adequately address site drainage issues. The interior of the site may include graveled roads / parking areas and re- vegetated areas. Upon completion of facility, final stormwater controls will be installed and maintained throughout the life of the project. Soil Management: Topsoil is an extremely valuable resource necessary for re- vegetation activities that are mandated by several regulatory agencies (CDPHE, COGCC, Garfield County). Because topsoil formation is a very slow process [ranges from <0.25 mm per year for cold, dry climates (similar to Colorado) to >1.5 mm per year in humid, warm climates], every effort shall be made to conserve existing topsoil by careful excavation and placement in a dedicated topsoil stockpile located east of the primary facility. Additional information concerning soil management is provided in URS / Chevron Specification for Site Preparation / Stabilization, Soil Management, Earthwork, and Backfill. Potential Sources of Storm -Water Pollution: • Sediment from disturbed areas and /or construction stockpile • Oil products associated with construction vehicles (e.g., refueling operations, engine oil leaks, etc.) • Vehicle washing for weed control • Trash and sanitary facilities Possible storm -water impacts related to these sources are summarized on page 3. Proposed Construction Sequence: (6/2009 thru — 9/2009) • Stake site and clear vegetation • Remove and stockpile topsoil Site - Specific Storm -Water / Soil Management Plan Page 3/5 Site Name: Well Pad 35 -BV Date of Plan: October 23, 2008 Rev. 1 • Install initial storm -water controls (including stockpile) ■ Grading: general excavation and fill, berm floodplain construction, soil compaction, grading of access and interior roads • Construction of spill containment berm • Excavation of building / enclosure foundations • Installation of building / enclosure foundations • Construct / install buildings • Final grading of all site features • Stabilization / re- vegetation of interior non -road areas • Install permanent storm -water controls • Erect fencing 2. Site Map and Erosion Control — SEE GEOTECHNICAL ENGINEERING GROUP, INC. (GEG) DRAWINGS FOR THE 35 -BV ACCESS ROAD STORM WATER MANAGEMENT PLAN AND STORM WATER MANAGEMENT PLAN WELL PAD 598- 35 -BV. DETAILS OF THE SITE STORM -WATER CONTROLS (BEST MANAGEMENT PRACTICES (BMPs) ARE PROVIDED ON THE GEG DRAWING STORM WATER MANAGEMENT PLAN WELL PAD SKR 578 -35 -BV BMPs. Information included on Erosion Control Plan Drawing: • Construction site boundary • Soil disturbance areas ■ Surface waters • Existing and new access roads • Locations of construction & permanent erosion controls (BMPs) 3. Storm -Water Management Controls -- NOTE: ALL BMPs ARE SUBJECT TO MODIFICATION AS REQUIRED BY SITE - CONDITIONS. SITE SPECIFIC SWMP AND ASSOCIATED EROSION CONTROL DRAWING(S) WILL BE MODIFIED TO REFLECT FIELD CONFIGURATION AS SOON AS MODIFICATION IS COMPLETED. BMP INSTALLATION NARRATIVE PROVIDED AS BMP GUIDE ATTACHMENT TO THE MASTER PLAN. BMP'S ARE SHOWN ON GEG DRAWING STORM WATER MANAGEMENT PLAN WELL PAD SKR 578 -35 -BV BMP. Source Occurrence Potential Storm Water Impact Distance to Surface Water Potential Runoff Concentration BMPS (') Sediment transport from construction activities Precipitation events / wind events High (w /o BMPs) —Low (with well maintained BMPs) .4-- 2D to 1,000+ feet High (without BMPs) — Low (with BMPs) • Straw wattles • Straw bales • Erosion control blankets • Silt fencing, as needed • Check dams • Ri•ra• Oil products associated with condensate transport and construction vehicles (2) Dependent on vehicle maintenance Dependent on fluid source (e.g., high for vehicle refueling; low for minor crankcase 20 to 1,000+ feet Dependent of fluid source — majority typically contained in soils Inspect site for possible leakage • Provide designated overnight parking area for construction vehicles — check daily for leakage • Scheduled vehicle maintenance teaka.e Vehicle washing for weed control (not required after {3) er Limited to when construction vehicles leave the area Low — water and sediment from this process contained by lined basin 9,000+ feet Low — limited quantities / controlled by lined basin Plastic lined basin with straw wattle berm or equivalent Trash and facilities (biocide and domestic wastewater) Primarily associated with wind events or sanitary facilities servicing activities Low if inspection process properly implemented y 20 to 1,000+ feet Low — limited fluid volume typically associated with sanitary facilities • Bear -proof trash receptacle with weekly pickup (minimum) or restrict food consumption to separate location (e.g., temporary office) fice) • Keep site clear of general construction trash — verify during weekly inspections Sanitary Sanity facilities Stake down to prevent tipping during wind events 1 instruct vendor to minimize spills & leaks during servicing / service free uentl ) See Erosion Control Details on GEG Drawing Storm Water Management Plan Well Pad SKR 578 -35 -BV BMP. Site - Specific Storm -Water / Soil Management Plan Page 4/5 Site Name: Well Pad 35 -BV Date of Plan: October 23, 2008 Rev. 1 Controls and response actions covered in site Spill Prevention, Control, and Countermeasures (SPCC) Plan. (3) Per Garfield County guidance (October 26, 2007 meeting with Steve Anthony, Garfield County Vegetation Manager). 4. Operational Stabilization / Reclamation Operational Stabilization: Once construction is completed, exterior berms and other disturbed areas will be re- vegetated with the Seed Mix for Sites below 7,000 ft, using application rates and plant species designated in the URS / Chevron Specification for the Re- Vegetation of Disturbed Areas, document number: PBSR- ALL -CIV- SPC- URS - 00000- 00004 -00. Any adjacent areas disturbed by construction traffic will be re- vegetated at this time. Final stabilization will be complete when areas have returned to 70- percent of the original vegetation cover. The gravel access roads (installed per construction drawings / specifications) will provide final stabilization in these areas but will be monitored to determine if maintenance operations are required. Noxious weed control will be continued on an as needed basis. Reclamation: The site will be reclaimed after the end of its operational life in accordance with Garfield County land use requirements. Reclamation activities will include: removing pipelines, gravel from roads and access pads; re- grading the site to the original contours (approximate); replacing topsoil; revegetation with appropriate seed mix; and installing and maintaining any required storm -water controls until final stabilization is achieved. Site inspections will be conducted in accordance with the Master SWMP (documented by Master Inspection Form). 5. Inspection / Maintenance Site - specific areas requiring inspection: • Site perimeter and nearby areas (e.g., adjacent stream channel — for possible trash) • Disturbed / re- vegetated areas ■ Soil stockpiles • Vehicle wash area • Trash container / sanitary facilities ■ BMPs Site- Specific Storm -Water / Soil Management Plan Page 5/5 Site Name: Well Pad 35 -BV Date of Plan: October 23, 2008 Rev. 1 6. Site Specific SWMP Revisions Description of revision Initiated /approved by: Date Note: Insert additional sheets as needed. 7. Site- Specific SWMP Administrator (only required if different from Site Administrator) Signature: Title: Printed Name: Date: