2 Colo. Code Regs. § 404-1-910
Current through Register Vol. 47, No. 20, October 25, 2024
Section 2 CCR 404-1-910 - PIT LINING REQUIREMENTS AND SPECIFICATIONSa. Except for Cuttings Trenches and Pits constructed as an initial emergency response measure pursuant to Rule 908.c.(1), all Pits constructed after January 15, 2021 will be lined.b.Skim Pits. Operators will not construct new Skim pits. All existing Skim Pits, regardless of date of construction, will be lined. For any unlined Skim Pits in existence on January 15, 2021, the Operator will submit a Form 27 outlining the Operator's plan to delineate and remediate any associated impacts and a plan to either properly line or close the Pit. The Form 27 for an unlined Skim Pit must be submitted to the Director by April 1, 2021. If the Pit will be lined and returned to service, the Operator will also submit and obtain the Director's approval of a Form 15.c. Operators will construct all Pits according to the following specifications: (1) Materials used in lining Pits will be of a synthetic material that is impervious, has high puncture and tear strength, has adequate elongation, and is resistant to deterioration by ultraviolet light, weathering, hydrocarbons, aqueous acids, alkali, fungi, or other substances in the produced water.(2) All Pit lining systems will be designed, constructed, installed, and maintained in accordance with the manufacturers' specifications and good engineering practices. Operators will maintain records demonstrating that the Operator followed manufacturers' specifications, and provide them to the Director upon request.(3) Field seams will be installed and tested in accordance with manufacturer specifications and good engineering practices. Operators will maintain testing results, repair documentation (including the dates of tests and repairs), and provide them to the Director upon request.d. Operators will construct all Pits, except those at Centralized E&P Waste Management Facilities, according to the following specifications: (1) Liners will have a minimum thickness of 24 mils. The synthetic or fabricated liner will cover the bottom and interior sides of the Pit with the edges secured with at least a 12-inch deep anchor trench around the Pit perimeter. The anchor trench will be designed to secure, and prevent slippage or destruction of, the liner materials.(2) The foundation for the liner will be constructed with material containing no sharp rocks, debris or other material that could puncture the liner. The foundation for the liner will have a minimum thickness of 12 inches after compaction, cover the entire bottom and interior sides of the Pit, and be constructed so that the hydraulic conductivity will not exceed 1.0 x 10-7 cm/sec after testing and compaction. Operators will maintain compaction and permeability test results measured in the laboratory and field and provide the results to the Director upon request.(3) As an alternative to the soil foundation described in Rule 910.d.(2), Operators may construct the foundation with bedding material that exceeds a hydraulic conductivity of 1.0 x 10-7 cm/sec, if a double synthetic liner system is used. However, the bottom and sides of the Pit will be padded with soil or synthetic matting type material and will be free of sharp rocks or other material that are capable of puncturing the liner. Each synthetic liner will have a minimum thickness of 24 mils.e. Operators will construct Pits used at Centralized E&P Waste Management Facilities according to the following specifications:(1) Liners will have a minimum thickness of 60 mils. The synthetic or fabricated liner will cover the bottom and interior sides of the Pit with the edges secured with at least a 12-inch deep anchor trench around the Pit perimeter or in accordance with the liner manufacturer's specifications. The anchor trench will be designed to secure, and prevent slippage or destruction of, the liner materials.(2) The foundation for the liner will be constructed with material containing no sharp rocks, debris, or other material that could puncture the liner. The foundation for the liner will have a minimum thickness of 24 inches after compaction, cover the entire bottom and interior sides of the Pit, and be constructed so that the hydraulic conductivity will not exceed 1.0 x 10-7 cm/sec after testing and compaction. Operators will maintain compaction and permeability test results measured in the laboratory and field and provide them to the Director upon request.(3) As an alternative to the soil foundation described in Rule 910.e.(2), Operators may use a secondary liner consisting of a geosynthetic clay liner, which is a manufactured hydraulic barrier typically consisting of bentonite clay or other very low permeability material, supported by geotextiles or geomembranes, which are held together by needling, stitching, or chemical adhesives.(4) As an alternative to the soil foundation described in Rule 910.e.(2), Operators may use a double synthetic liner system. However, the bottom and sides of the Pit will be padded with soil or synthetic matting type material and will be free of sharp rocks or other materials that are capable of puncturing the liner. Each synthetic liner will have a maximum thickness of 60 mils.(5) All Pits will be constructed and operated with a leak detection system.f. The Director may require the use of additional liners or a leak detection system for the Pit or other equivalent protective measures, including but not limited to, increased recordkeeping requirements, monitoring systems, and underlying gravel filled sumps and lateral systems. In making such a determination, the Director will consider the site-specific information provided by the Operator, including but not limited to surface and subsurface geology, the presence and depth to Groundwater, the quality of the produced water, the hydraulic conductivity of the surrounding soils, the distance to surface water and water wells, and the type of liner.37 CR 16, August 25, 2014, effective 9/30/201438 CR 01, January 10, 2015, effective 2/14/201538 CR 03, February 10, 2015, effective 3/2/201538 CR 07, April 10, 2015, effective 4/30/201538 CR 16, August 25, 2015, effective 9/14/201539 CR 04, February 25, 2016, effective 3/16/201641 CR 05, March 10, 2018, effective 4/1/201841 CR 06, March 25, 2018, effective 5/1/201841 CR 23, December 10, 2018, effective 12/30/201842 CR 02, January 25, 2019, effective 2/14/201942 CR 17, September 10, 2019, effective 9/30/201942 CR 24, December 25, 2019, effective 1/14/202043 CR 17, September 10, 2020, effective 9/30/202043 CR 13, July 10, 2020, effective 11/2/202043 CR 24, December 25, 2020, effective 1/15/202145 CR 07, April 10, 2022, effective 4/30/202245 CR 09, May 10, 2022, effective 5/30/202245 CR 13, July 10, 2022, effective 7/30/2022