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The mine pad areas have been determined to have <br /> factors tha:. range from 0 . 35 to 0 . 42. The basis for <br /> this determination is that construction pads are mainly <br /> formed on excavated bedrock and compacted rock backfill. <br /> Small localized surface areas will <br /> have a mixture of <br /> dust composed mainly of black shale with some coal dust. <br /> The sediment pond design volumes are based on the cal- <br /> culated sediment yields with a total pond. storage capacity <br /> for 3-year accumulation of sediment. The operator is <br /> bound by law to maintain the sediment pond by removal of <br /> sediment that is in excess of 50 per cent of the esti- <br /> mated sediment storage. <br /> The estimated ''K'' factors for each mine pad with coal <br /> dust on it are as follows : <br /> Estimated <br /> Site Conditions Thickness <br /> Mine Factor --- <br /> 1 0. 42 Some coal and black shale <br /> 1" <br /> dust <br /> 2 0 . 40 Little coal and black shale 0 . 1" <br /> dust <br /> 3 0 . 35 <br /> Little Coal dust O .W. <br /> 5 0 . 35 <br /> Little Coal dust 0 . 111 <br /> *Note that loose coal and black shale dust are restricted <br /> to vicinity of conveyor only at Mine 1 . <br /> The K factor used for the Mine 1 pad area is modified to <br /> d ''K ' factor <br /> 0 .70 as recommended by CMLRE . This modifie <br /> considers the greater thickness of black shale mixed with <br /> coal dust. The revised estimated sediment yield of <br /> 0 . 122 of for dine 1 pad. <br /> F <br />