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calcareous to slightly ferruginous cement and minor argillaceous and <br /> ' carbonaceous shale partings. Based on analysis of material removed from the <br /> mine the following particle size distribution was obtained. <br /> Size Distribution <br /> Material above 6" 20% by weight <br /> Material above 4" 30% by weight - <br /> Material above 2" 30% by weight <br /> Material above#4 mesh' f O% by weight <br /> Material above #�O mesh' S% by weight <br /> Material above #40 mesh' < 5% by weight <br /> Material above#200 mesh' <5% by weiq ht <br /> `U.S. Series equivalent screen size <br /> This information was provided by National Kinq Coal <br /> The following table summarized material properties for the waste rocK. <br /> Material Strength <br /> Approx. dry density = 86 pcf <br /> Maximum dry density = 9t pcf <br /> Optimum moisture content = 12.0 <br /> Internal angle of friction = 32' <br /> Cohesion = 2.8 psi <br /> Relative toughness = '1.5 <br /> Ft-Ib/ft�of fracture = 3�2.4 <br /> Compressive strength, 9500 psi (no partings) <br /> Compactive '12.5 <br /> Compressive strength 8400 psi (partings) <br /> This dale was supp/iad by Kin Coa/ <br /> Coal Waste Pile Configuration <br /> The criteria used in designing the waste pile were '1) to be structurally stable, <br /> 2) provide 'I,000,000 cubic yards of storage volume and 3) to provide adequate <br /> surface and subsurface drainage. Please refer to tlesign drawing sheets 'I antl 2 <br /> for details. <br /> The waste pile will begin at the toe of the existing waste bank, across the <br /> access road from the coal storage pile and eMend up valley about 'I600 ft. The <br /> waste pile will have a front face slope of 2.5:�, eMend across the valley from side <br /> to side and have a maximum thickness of 200 ft at the top of the front face. it will <br /> slope upvalley at 'I% and will have a cross slope of 2'/o with the high side on the <br /> north. <br /> January 1998 <br />