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Highwall Reduction: <br />Volume Calculation: <br />A = .5(30 ft. x 90 ft.) - .5(30 ft. x 30 ft.) =goo ft.2 <br />Approximate length of highwall needing slope reduction noted during <br />September 2010 inspection = 1,000 Ift. <br />V = 900 ft.2 x 1,000 Ift. = 900,000 ft.3 = 33,333 yd.3 <br />30 ft. <br />60 ft. 30 ft.