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Highwall reduction: <br />Approximate length of highwall = 500 feet <br />Approximate average current slope = 1H:1V <br />Required final slope = 3H:1V <br />Volume of material to be moved calculated as follows: <br />Area = .5(15 ft. x 45 ft.) - .5(15 ft. x 15 ft.) = 225 ft.2 <br />Volume = 225 ft.2 x 500 ft. = 112,500 ft.3 = 4,167 yds.3 <br />Cut and fill procedure yields average push distance of 15 ft. <br />15 ft. <br />30 ft. 15 ft.