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Highwall Reduction (Cut and Fill): <br />Approximate height = 15 ft. <br />Approximate length = 4,000 ft. <br />Approximate slope = 1H:1V <br />Final slope = 3H:1V <br />Area =.5(7.5 ft. x 22.5 ft) -.5(7.5 ft. x 7.5 ft.) = 56.25 ft.2 <br />Volume = 56.25 ft.2 x 4,000 Ift. = 225,000 ft.3 = 8,333 yd.3 <br />15 ft. <br />r, r, 7r, f+2 <br />15 ft. <br />15 ft. 30 ft.