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West Elk Mine <br />Construction of the Materials Storage Bench Building was completed in March 1996. The <br />building is utilized to store materials that will be used in the mine. The 3,900 square foot <br />building has six bays. The as-built description is provided in Exhibit 68. <br />Bulk Fuel, Barrel, and Hydraulic Component Storage Areas <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 <br />stored within a separate covered containment area of approximately 1,840 square feet located <br />between the bulk fuel area and the Maintenance Shop. These storage areas are enclosed by three <br />walls and a roof to reduce the accumulation of precipitation within the concrete bunkers. The <br />material stored in this area includes products, recyclables, and hazardous wastes. <br />Petroleum products are stored for ongoing operations and maintenance usage. Recyclables are <br />collected and transported off-site and hazardous waste is also transported off-site. See the Spill <br />Prevention, Control and Countermeasure Plan in Exhibit 8 for more detailed information <br />regarding the fuel storage area containment. 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 <br />of the heated, enclosed bay is the hydraulic components storage building. This 450 square <br />foot, steel structure provides containment and cover for hydraulic components, motors, etc. <br />being stored prior to return to vendors. An as-built construction description is provided in <br />Exhibit 68. <br />Oil/Water Separation S sy tem <br />The oil/water separation system consists of an oil skimming pit and an oil/water separator. The <br />skimming pit is contained in the shop building, receiving water from wash down bays and the <br />shop. An oil skimmer unit is installed in the skimmer pit and removes the bulk of the oil which <br />may accumulate on the water. Overflow from the pit is routed to the oil/water separator. The <br />oil/water separator is a 500-gallon capacity two-celled unit of reinforced concrete. It is <br />rectangular shaped, approximately five feet wide, seven feet long and 5.5 feet deep. In short, the <br />inlet cell receives discharge from the skimmer room and drains in the fuel, lubricant and barrel <br />storage areas. The inlet cell of the tank is initially filled with water above the diaphragm <br />separating it from the second baffled cell, so that inflows will rise above the level of the <br />diaphragm between the baffled cells. Oil will float above this elevation, and clean water will be <br />allowed to settle in the first cell, and manholes are available for clean-outs and inspection in both <br />baffled areas. <br />Bulk Rockdust Bin and Compressor Building <br />MCC utilizes a bulk rockdust storage and distribution system at West Elk Mine. The bulk <br />rockdust bin has a capacity of approximately 142 tons. The compressor, distribution tank and <br />controls are contained in a 416 square foot building at the base of the bulk storage bin. An as- <br />built construction description is provided in Exhibit 68. <br />Water Treatment System <br />2.05-19 Revised June 2005 PR10; Rev. January 2006; Rev. March 2006; Rev. Apri! 2006 PRIG, May 2006 PRIO; Rev. January 2009 MR-350 <br />