2022-04-08_PERMIT FILE - C1981044 (4)

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All soil stockpiles will be stabilized with the perennial seed mixture presented in Table 57, Topsoil Stockpile Seed Mixture. All existing soil stockpile locations are shown on the Drainage and Sediment Control Map (Map 26). The following tables indicate the soil stockpile locations,volumes,and soil replacement areas and depths: Table 58,Topsoil Replacement-No. 5 Portal and General Area Table 59,Topsoil Replacement-No. 5A Portal and General Area, Old Shop,Carpenter Shop Table 60,Topsoil Replacement-No. 9 Portal and General Area, Waste Disposal Pile Table 61,Topsoil Replacement-No. 9A Portal Area Table 62,Topsoil Replacement-Miscellaneous Sites at Mine Overburden Since the Williams Fork Mines and previous associated operations are underground mining operations,there has been very little movement of overburden. Previous limited surface mining activity ceased many years ago and the associated surface disturbance areas have been reclaimed. Refer to Section 2.05.4 Reclamation Plan for reclamation details. Coal-Handling Structures A detailed discussion of coal-handling structures is provided in the previous"Mine Facilities"section. Coal Processing Waste and Non-Coal Processing Waste All non-coal processing wastes are transported off-site and disposed of in the Moffat County Landfill except sludge from the sandtraps and bottom of the oil/water separators. This material, which is largely dirt and road grime with minor amounts of oil cleaned off mining vehicles and shop floors is tested for RCRA characteristics to assure it does not qualify as hazardous waste, and then disposed of in the approved refuse piles. Test results are kept on file. These materials will be spread-out and compacted at the waste disposal sites along with the underground development waste. It is estimated that 10 to 40 cy per month of this material is produced when the Mine is in full production. Generally, any potentially combustible materials will be removed for off-site disposal in a suitable permitted landfill. If potentially combustible materials are disposed of on-site, they will be placed in the permitted solid waste disposal area or in the portal backfill area during reclamation and covered with an adequate layer of non-combustible soil material to isolate the materials and prevent combustion. In the unlikely event that combustion(smoldering or ignition) of any waste materials does occur, heavy equipment will be used to remove and isolate or cover the subject materials to either allow them to burn-out or to extinguish them to prevent spread of the combustion and any sustained combustion. Underground Development Waste During active production, MCM would produce underground development waste from two sources: rock ramps or boreholes between seams and coarse reject from run-of-mine coal. MCM may store development waste underground in compliance with MSHA regulations or transfer this material by conveyor to the surface for disposal at approved waste disposal sites maintained in compliance with applicable MSHA and CDRMS regulations. Although MCM does not have a coal preparation plant, coarse reject waste rock is physically separated from the run-of-mine coal at the 5A Yard rock diversion chute or rotary breaker located at the screening and sizing building. Two approved waste disposal sites have been established, as shown on the Structures and Renewable Resources Map (Map 25). When operational constraints restrict immediate transfer of waste to the permanent disposal sites it will be temporarily stored in the 5A Yard at the locations shown on Map 26. A maximum of 3,000 cubic yards will be stored in the 5 A Yard. This material will then be transferred from the temporary storage areas to the permanent disposal sites within 60 days. Any problems resulting in the need for additional time and storage volume will be addressed on an individual occurrence basis. Waste Disposal Site The CMLRD approved this waste disposal site in 1983. Mr. Robert W. Thompson of CTL/Thompson, Inc. of Denver, Colorado completed the geotechnical design and analysis of the waste disposal site. The design methodology RN18-07 2.05-18 Revised 07/10/18