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9 <br />' ents of the disposal pile: <br /> o Shale - from the roof, overcast construction, <br />' sump construction, roof fall cleanup, <br /> and rotary breaker reject. <br /> o Sandstone - from the roof, overcast construction, <br />' and reject from the rotary breaker. <br />' o Fireclay - from the floor as a result of grading, <br /> road maintenance, and sump construction. <br />' o Coal - from breaker plant reject will be kept <br /> to the minimum possible. <br /> <br /> The estimated ranges of these materials in the waste pile <br />' are as follows (ARCO Coal Company's estimate): <br /> Material Type Range of content Average content <br /> in waste rock material in waste rock <br /> material <br />' <br /> Shale 70 % - 90 % 80 <br />' Sandstone 0 % - 30 % 10 % <br /> Fireclay 0 % - 16 % 8 % <br /> Coal 0 Z - 2 % 2 % <br />' <br /> The waste rock will have some water applied during mining <br /> and processing for dust supression. It is expected to consist <br /> principally of a rock fill type of material ("coarse refuse"), <br />t although some of the component materials may be susceptible to <br /> degradation if exposed to weathering. The material will also <br />' break down to some extent during compaction. It is not proposes <br /> to incorporate large quantities of fine and/or saturated ma- <br /> <br />1 n+c <br />oaocosw~mw <br />+ <br /> . <br />. <br />+r <br />c,EO <br />