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a system where the coarse and fine fractions are placed separately. <br /> Material size is determined by sieve analysis of samples of the <br /> combined coarse and fine discharge. Table II-B-3 shows the <br /> average sizes of the refuse samples . <br /> TABLE II-B-3 <br /> COAL REFUSE DISPOSAL AREA <br /> COAL BASIN MINE <br /> AVERAGE COAL REFUSE MATERIAL SIZE AS MEASURED IN-PLANT <br /> Size Percent <br /> +2" 25 .4% <br /> 2" x Y" 40 .4% <br /> i" x 114' 11 . 7% <br /> ;4' x 6M 4 . 2% <br /> 6M x 10M 3 .0% <br /> 10M x 28M 5•. 6% <br /> 28M x 60M 5 .4% <br /> 60M x 100M 2 .1% <br /> -loom 2 . 2% <br /> 100. 00% <br /> The hydrologic and strength characteristics of a <br /> refuse pile depends, to a large extent, on the placement of the <br /> refuse. In compliance with Federal and State coal waste pile <br /> design specifications the side slopes of the pile shall not <br /> exceed 1 (v) : 2(h) and the grade of the top of the pile shall not <br /> exceed 2 percent . Waste shall be spread in approximately horizontal <br /> layers no more than 24 inches in thickness and compacted by <br /> .!4/ <br />