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Coal Processin¢ Waste and Non-Coal Processine Waste • All non-coal processing waste are to be disposed at the Moffat County landfill except sludge from the sandtraps and bottom of RAG Empire's oil/water separators. This material, which is largely dirt and refuse cleaned off mining vehicles and shop floors will be tested for RCRA characteristics to assure it is not hazardous waste and then disposed of on the approved refuse piles. Test results will be kept on file at RAG Empire. The material will be spread out and compacted at the waste disposal sites with the underground development waste. It is estimated that RAG Empire produces between 10 and 40 yds. Per month of this material when in full production. Underground Development Waste RAG Empire produces underground development waste from two sources: rock ramps or boreholes between seams and coarse reject from run of mine coal. RAG Empire both stores development waste underground in compliance with MSHA regulations and ships material to the surface for disposal at approved waste disposal sites maintained in compliance with MSHA and CDMG regulations. Rock slope material is transported to the surface on conveyors. Although RAG Empire does not have a preparation plant, coarse reject waste rock is physically separated from the run of mine coal at the SA Yard rock diversion chute or rotary breaker located at the screening and sizing building. Currently, RAG Empire has two approved waste disposal sites. These sites are shown on the Structures and Renewable Resources Map (Map 25). Whett operational constraints restrict immediate transfer of waste to the permanent disposal sites it will be temporarily stored in the SA Yard at [he 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. Problems resulting in additional time and storage volume will be requested on an individual occurrence basis. . Waste Disposal Site The MLRD approved this waste disposal site in 1983. Mr. Robert W. Thompson of CTL/71~ompson, Inc. of Denver, Colorado performed the geotechnical design of the waste disposal site. The design methodology and operation restrictions of the site are presented in Exhibit 21, Waste Disposal Site. No. 9 Portal Waste Disposal Site The No. 9 Portal excavation is the location for the additional waste disposal site. The decision to use of the No. 9 Portal excavation as a waste disposal site was reached for four (4) basic reasons: I) the availability of the site, 2) the fact that 45,000 cu-yd of coarse reject is already approved for disposal, 3) all disposal would be below the original ground surface, and 4) utilization of the No. 9 excavation area may eliminate the need to expand the approved waste disposal site if additional capacity is required. For location of the No. 9 Portal waste disposal site, please refer to the Structures and Renewable Resources Map (Map 25). Background. In the original RAG Empire Permit (1983), it was planned to backfill the No. 9 portal excavation with [he previously excavated material. In 1984 during the construction of the 100,000 ton raw coal storage pile, 45,000 cu-yd of this same excavated material was utilized in the construction of the coal storage pile pad. It was agreed, at that time, to replace this 45,000 cu-yds with coarse reject material. The coarse reject was to be placed within the No. 9 portal excavation backfill. Disposal Pile Construction Details. The No. 9 Portal excavation was prepared for waste disposal by first, covering the • portal entries with a minimum of 15' of material. Second, the exposed coal seam ("P" coal seam) was covered with a minimum of four (4) feet of inert material. Please refer to the No. 9 Portal-Waste Disposal Site (Map 28). All associated mining equipment including conveyors and structures, ventilation fans, electrical substations, and associated mining scrap would be removed prior to the backfilling operation. Backfilling the excavation a minimum MidTerm Response sang 15 ~^f? gpPR031~0 2.05-21 Revised 12/05/01 ~t~~3