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The above-ground system will fit into the existing wash plant (Figure • II.A-2) with minimal changes and permit continuous material handling and storage during emergency situations. The underground system will fit into the existing mine and mine plan, be flexible enough to permit movement of the dewatering/pneumatic feeding station, and not interfere with the present mining methods. The total underground waste disposal system's conceptual design is illus- trated in Figure II.A-3. The refuse separated from the clean coal in the Baum Jig is removed by draining bucket elevators and directed by means of a flop gate to either a double-deck dewatering screen or refuse crusher. The double-deck screen will be active only during a stoppage in coarse slurry transport. The bottom cloth of the dewatering screen removes the <U.5 mm material while discharging its top size into a 100-ton capacity coarse refuse • bin. Refuse can be loaded from this bin into 20-ton trucks for surface dis- posal. The screen drainage (<0.5 mm particles) reports to the fine refuse static thickener. During underground disposal system operation, the coarse refuse is directed from the jig to the refuse crusher for sizing to a 2 in top size. Tiie sized waste drops into the slurry preparation tank and is subsequently pumped under- ground by a series of centrifugal pumps. In parallel with movement of coarse material (Figure II.A-4) the fine ref- use (<35 mesh particles) which has been thickened in the static thickener to a 25 to 30 percent solids consistency is also pumped underground. During emergency situations both slurries would be diverted to an under- ground emergency storage sump. b