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HomeMy WebLinkAbout1.13 Grading and Drainage Plan Narrative Administrative Review CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 TPR 176-25 Underground Injection Control Well Grading and Drainage Plan Narrative CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 1 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 1. Introduction The following narrative addresses the requirements for the Grading and Drainage Plan under Article 4 Section 203.E. of the Garfield County Land Use and Development Code (LUDC). 2. Section 4-203.E.1. Site Map. A Site Map showing locations of any existing structures, Waterbodies or hydrologic features on the site, including intermittent water features, Wetlands, and the 100-year Floodplain boundaries. The 176-25 UIC Well Site Plan, depicting the site features, are provided in the Site Plan tab. TPR Well Pad 25A is an existing, previously constructed, and established well pad. There are no streams, floodplain areas, intermittent water features, wetlands, or other hydrological features located within the perimeter of Well Pad 25A. There are no 100- year Floodplain boundaries located within the vicinity of the site. The Surface Hydrology Map and a narrative exhibit describing the hydrology surrounding Well Pad 25A is located in the Grading and Drainage Plan tab. 3. Section 4-203.E.2. Drainage Structures. Section 4-203.E.2.a. Locations of existing and proposed drainage structures or natural drainage features affecting site drainage on the parcel and within 10 feet adjacent to the site boundary, including street gutters, storm sewers, drainage channels, and other water conveyance structures; and Wetlands or other Waterbodies receiving storm Runoff from the site. Section 4-203.E.2.b. Preliminary engineering design and construction features for drainage structures to be constructed. Well Pad 25A was constructed in 2008 and the TPR 176-25 well was drilled in 2013. Well Pad 25A has no uncontrolled stormwater on the well pad. The well pad has a 6- inch-diameter drain at the center of the well pad. The drain is piped outside of the berm to a trench. The trench drains to a catchment basin. Solids settle in the catchment basin for removal. The stormwater evaporates. A construction layout showing the Well Pad 25A stormwater controls is located in the Grading and Drainage Plan tab. 4. Section 4-203.E.3. Topography. Existing topography at reasonable contour intervals to provide necessary detail of the site. The map should extend a minimum of 10 feet beyond the property line and show the location of the property line. The proposed injection well will be located on Well Pad 25A, an existing, established location. The nearest adjacent parcel is owned by CPX, the Applicant. The nearest CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 2 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 parcel boundary owned by a different surface owner (the White River National Forest) is located approximately 2,200 feet to the north. The Stormwater Figure located in the Grading and Drainage Plan tab, the 176-25 UIC Well Site Plan located in the Site Plan tab, and the Hydrology Map located in the Grading and Drainage Plan tab all show reasonable contour intervals at the site. 5. Section 4-203.E.4. Grading Plan. A grading plan showing the proposed topography at reasonable contour intervals that provides necessary detail of the site. The plan shall show elevations, dimensions, location, extent, and Slope of all proposed clearing, and Grading including building site and driveway grades. There are no proposed grading, construction, or site clearing activities associated with the development of the proposed injection well. Below is a description of the current acreage disturbance of the existing Well Pad 25A and the estimated footprint following interim reclamation required by COGCC. Surface Use Disturbance – Well Pad 25A Approximate Acres of Disturbance Existing Disturbance - Well Pad 25A (including Cuts/fills) 5.5 Disturbance After Interim Reclamation (Long-term Disturbance) 1.8 The Stormwater Figure located in the Grading and Drainage Plan tab and the 176-25 UIC Well Site Plan located in the Site Plan tab show the as-built details for the site. 6. Section 4-203.E.5. Soil Stockpile and Snow Storage Areas. Probable locations of soil stockpiles and snow storage areas. An existing soil stockpile is located at the edge of Well Pad 25A. It contains an estimated 8,450 cubic yards of soil salvaged during construction of Well Pad 25A. The soil stockpile is protected from wind and water erosion by a stable 2:1 slope and vegetation. The proposed UIC well will not result in additional soil disturbance. Snow within the site perimeter will be stockpiled only as needed to allow operations and will be placed near the outer boundary of the pad. 7. Section 4-203.E.6. Drainage Plan. CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 3 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 Proposed drainage plan. TPR Well Pad 25A is an existing, previously constructed, and established well pad. No well pad construction activities will be associated with the development of the proposed injection well. CPX will utilize engineering and operational BMPs to limited runoff. The Well Pad 25A drainage features and stormwater controls are detailed in the Stormwater Figure located in the Grading and Drainage tab. 8. Section 4-203.E.7. Equipment Storage Areas. Location of storage areas designated for equipment, fuel, lubricants, chemical, and waste storage with an explanation of spill containment structures. The TPR 176-25 UIC well TPR Well Pad 25A will have approximately 4,750 barrels of on-pad storage for produced water, part of which will be used to store produced water for injection in the proposed UIC well.1 Produced water tanks will be installed in lined secondary containment providing capacity of 150% of the volume of the largest tank. 9. Section 4-203.E.8 Temporary Roads. Location of temporary roads designed for use during the construction period. No temporary road are required to develop the proposed injection well. A site-specific access road was constructed during the initial development of Well Pad 25A in 2008. This access road will be utilized during the life of the UIC well and associated well pad. 10. Section 4-203.E.9. Areas of Steep Slope. Areas with Slope of 20% or greater shall be identified by location and percentage of Slope, both for the existing site conditions and within the developed area. The proposed injection well involves the conversion of an existing drilled but uncompleted well into an injection well. The injection well will be located on an existing, established well pad that is fully constructed and graded. There are no slopes that exceed 20% within the developed well pad. 1 Not all of the produced water storage on TPR Well Pad 25A will be devoted to supporting the proposed injection well. At the maximum anticipated injection rate, CPX anticipates that approximately 3,000 barrels of storage will be needed to support the injection well operations. In addition to the produced water storage, Pad 25A will also contain one 750 bbl condensate tank and a 300 bbl blowdown tank that will be used to control wellbore emissions from the natural gas wells on Pad 25A in the event a well on Pad 25A needs to be unloaded. The condensate tank and blowdown tank will not support the proposed UIC well. CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 4 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 11. Section 4-203.E.10. Construction Schedule. Construction schedule indicating the anticipated starting and completion time periods of the site Grading and/or construction sequence, including the installation and removal of erosion and sediment control measures, and the estimated duration of exposure of each area prior to the completion of temporary erosion and sediment control measures. The proposed UIC well involves the conversion of an existing drilled but not completed well located on an existing well pad. Additional construction activities associated with the conversion of the subject well to develop the well into a UIC well are listed below. Stage/ Activity Time Interval (Days) Projected Schedule Well Conversion 14 2023* Injection Equipment installation 20 2023* *Subject to permit approval and equipment availability. 12. Section 4-203.E.11. Permanent Stabilization. A brief description of how the site will be stabilized after construction is completed. Cut and fill work for Well Pad 25A is complete. The well pad was constructed in approximately 2008. The well pad surface and cut slopes are stable and compacted. The berms on fill slopes are compacted and vegetated. The well pad has no uncontrolled stormwater. The well pad berms have approximately 80 percent vegetative cover on the outside slopes to stabilize the berms. Well Pad 25A has a surface layer of 1-inch aggregate base coarse screened to 3-inch minus. CPX will add an additional 4 to 6 inches of aggregate to support proposed activities, including the conversion of the TPR 176-25 well into an injection well. The Well Pad 25A fill slopes have 2-foot-high earthen berms, compacted to 95 percent soil/moisture density. Stormwater controls on the well pad consist of the 6-inch-diameter drain at the center of the well pad. The drain is piped outside of the berm to a trench. The trench drains to a catchment basin where solids settle for removal and the stormwater evaporates. The access road has a borrow ditch on the upslope side where stormwater is diverted to 18-inch and 24-inch culverts placed at 600-foot intervals along the roadway. Areas of interim reclamation will be seeded for long term stabilization. Interim reclamation measures will comply with all COGCC requirements. 13. Section 4-203.E.12. Erosion Control Measures. Plan view drawings of all erosion and sediment control measures showing approximate locations and site drainage patterns for construction phases and final design elements. CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 5 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 Text may be necessary to accompany and explain the drawings. Typical erosion control measures should be depicted using standard map symbols. The Well Pad 25A drainage features and stormwater controls are detailed in the Stormwater Figure located in the Grading and Drainage tab. CPX and/or its certified contractors will perform regular maintenance of BMPs. These controls and BMPs will be modified after interim reclamation of Well Pad 25A. 14. Section 4-203.E.13. Estimated Cost. Estimated total cost, including installation and maintenance, of the required temporary soil erosion and sediment control measures. There are no temporary soil erosion and sediment control measures associated with the proposed UIC well. 15. Section 4-203.E.14. Calculations. Any calculations made for determining rainfall, Runoff, sizing any sediment basins, diversions, conveyance, or detention/retention facilities. There are no new construction activities associated with the conversion of the TPR 176- 25 Well into an injection well. Well Pad 25A is a fully constructed and established well pad. The now fully revegetated sediment basin has always been adequate to contain stormwater from storm events and snowmelt runoff. 16. Section 4-203.E.15. Neighboring Areas. A description of neighboring areas with regard to land use and existing pertinent features such as lakes, streams, structures, roads, etc. The subject parcel is zoned Rural. All adjacent parcels are zoned Rural or Public Lands in Garfield County. Existing use of adjacent property and neighboring properties are natural resources extraction, public lands, and limited agricultural. A private network of access roads exists in the Tepee Park Ranch operations area. CPX owns, maintains, and utilizes private access roads that are adjacent to the site. There are no streams, areas subject to flooding, high ground water areas, and lakes within the perimeter of the site. Surface Hydrology Map and a narrative exhibit describing the hydrology surrounding Well Pad 25A is located in the Grading and Drainage Plan tab. 17. Section 4-203.E.16. Stormwater Management. A description of the stormwater management planning concept for the site, including both structural and nonstructural best management practices. CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 6 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 Well Pad 25A was designed and constructed with site specific stormwater controls depicted in the Stormwater Figure in the Grading and Drainage Plan tab. 18. Section 4-203.E.17. Stormwater Management Plan. Copy of the stormwater management plan application to CDPHE with date of submittal. CPX will adhere to the Tepee Park Ranch Stormwater Management Plan (SWMP) detailing stormwater BMPs, controls, and inspections. Due to the size of the SWMP, the plan was not provided in the Administrative Review application, but CPX can provide any information to Garfield County upon request. The approved Stormwater Permit (Certification Number: COR401163) issued by CDPHE on April 1, 2019, is located in the Grading and Drainage Plan tab.. 19. Section 4-203.E.18. Reclamation, Revegetation and Soil Plan. A plan that includes the following information and is consistent with the standards in section 7-208. The expected lifespan of the proposed UIC well is approximately 30 years. Wells in the Piceance Basin may produce for up to 30 years; therefore, the proposed support facility will operate the same duration as the wells may produce. Interim reclamation will occur at the site after CPX’s 34 natural gas wells are drilled and completed and will adhere to BMPs and requirements set forth by COGCC. Reclaimed areas will be vegetated with approved seed mix in order to reduce erosion and prevent fugitive dust. CPX has provided a Weed Management Plan in the Maps and Plans tab. 20. Section 4-203.E.19. Hydraulic Calculations. Hydrologic, hydraulic, and all other calculations used to size and design drainage facilities and/or structural BMPs. There are no new construction activities associated with the conversion of the TPR 176- 25 Well into an injection well. Well Pad 25A is a fully constructed and established well pad. The now fully revegetated sediment basin has always been adequate to contain stormwater from storm events and snowmelt runoff. 21. Section 4-203.E.20. Maintenance Requirements. Maintenance requirements for all proposed BMPs should be discussed including access, schedules, costs, and designation of a responsible party. CPX TPR 176-25 UIC Well Article 4 Section 203.E Grading and Drainage Plan Narrative Administrative Review 7 CPX Piceance Holdings, LLC Garfield County, Colorado 34 S. Wynden Drive, Suite 240 2022 Houston, TX 77056 CPX will oversee maintenance of the TPR 176-25 UIC Well during conversion, interim reclamation, and operations. CPX will comply with all COGCC and other state and federal requirements. There are no new construction or grading activities associated with the conversion of the TPR 176-25 Well into an injection well. Well Pad 25A is a fully constructed and established well pad. No specific grading, construction, or stormwater BMPs are being proposed as part of this application. 22. Section 4-203.E.21. Spill Prevention Control and Countermeasures Plan, if Applicable. A SPCC Plan will be required for any facility with the potential to discharge oil of any kind or in any form including, but not limited to, petroleum, fuel oil, sludge, oil refuse and oil mixed with wastes, in quantities that may be harmful to navigable water and adjoining shoreline, per EPA regulations. CPX maintains a Spill Prevention, Control, and Countermeasure (SPCC) Plan developed in March 2020.