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West Elk Mine <br /> <br />2.05-18 Rev. 06/05, 01/06, 03/06, 04/06 & 05/06- PR10; 01/09- MR350; 04/09- TR116; 04/09- MR353; 05/09- MR354; 08/09- TR118; <br />08/09- TR119; 09/12- MR387; 11/12- MR390; 07/18-PR15; 11/18- MR430; MR438- 09/19; MR439- 11/19; 07/20- MR447; 6/22- <br />MR464; 6/22 MR466; 6/22 MR468; 11/22 MR471; 07/23 MR474; 8/23 MR476; 09/23 MR477, 10/23 MR478, MR479, 1/24-TR152 <br /> <br />Construction of the Materials Storage Bench Building was completed in March 1996. The building <br />is utilized to store materials that will be used in the mine. The 3,900 square foot building has six <br />bays. The as-built description is provided in Exhibit 68. <br /> <br />Bulk Fuel, Barrel, and Hydraulic Component Storage Areas <br /> <br />MCC stores bulk petroleum products within a covered, concrete bunker capable of containing <br />approximately 31,000 gallons. Barrels containing petroleum products or waste materials are stored <br />within a separate covered containment area of approximately 1,840 square feet located between the <br />bulk fuel area and the Maintenance Shop. These storage areas are enclosed by three walls and a roof <br />to reduce the accumulation of precipitation within the concrete bunkers. The material stored in this <br />area includes products, recyclables, and hazardous wastes. <br /> <br />Petroleum products, as well as propane, are stored for ongoing operations and maintenance usage. <br />Recyclables are collected and transported off-site and hazardous waste is also transported off-site. <br />See the Spill Prevention, Control and Countermeasure Plan in Exhibit 8 for more detailed <br />information regarding storage of these products. The bulk fuel storage area also includes a heated, <br />enclosed storage bay for a total storage area of approximately 3,500 square feet. To the west of <br />the heated, enclosed bay is the hydraulic components storage building. This 450 square foot, steel <br />structure provides containment and cover for hydraulic components, motors, etc. being stored prior <br />to return to vendors. Dimensions of buildings and tanks are provided in Exhibit 68. <br /> <br />Oil Separation Skimming System <br /> <br />The oil separation system consists of an oil skimming pit and an oil skimmer. The skimming pit is <br />contained in the shop building and receives water from wash down bays and the shop. An oil skimmer <br />pipe allows the floating oils to be directed to oil/water separators below the shop and near the silos. <br />The remaining water is drained to the mine site sediment ponds and/or is pumped and hauled to an <br />authorized disposal facility. <br /> <br />Bulk Rockdust Bin and Compressor Building <br /> <br />MCC utilizes a bulk rockdust storage and distribution system at West Elk Mine. The #1 bulk rock <br />dust bin has a capacity of approximately 142 tons and contains the baghouse. Dust from #1 tank is <br />transferred underground. Bulk Rock dust tank #2 has a capacity of approximately 150 tons and is <br />used for additional storage only. The compressor, distribution tank and controls are contained in a <br />416 square foot building at the base of the bulk storage bin. An as-built construction description is <br />provided in Exhibit 68. <br /> <br />Water Treatment Plant <br /> <br />A water treatment plant at the mine site provides potable water for the operation. The Culligan Multi- <br />Tech 48 water treatment system can treat water at the rate of 62 gpm. Thus, maximum capacity is <br />about 89,280 gallons of treated water per day. The water treatment plant is operated as required by <br />state regulations and under the jurisdiction of the Colorado Department of Public Health and <br />Environment (CDPHE). An as-built construction description of the building housing this system is