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Backfill volume requirements: <br /> 40'average bench height @ 3.5:1 slope over linear length of 2000' <br /> 40' x 140' /2 =2800 cu feet per each foot of linear run... <br /> 2800'x 2000' /27'/cu.yd. =207,407 cubic yards fill needed to backfill 2000' <br /> Conversion of cubic yards to tons: 80#/cu/ft. = 80 x 27/2000= 1.1 ton/cu yard soil <br /> 207,407 cu/yds. x 1.1 =228,147 tons topsoil and subsoil. <br /> This volume estimate would include topsoil put in place and will reduce the volume of top soil <br /> necessary to cover a minimum 10" over roads, former product stockpile areas, and disturbed <br /> lands up to 50 acres.... <br /> Area of surface estimated above: 2000' x 146'=292,000/43,560 sq.ft./ac = 6.7 acres <br /> Total area to be covered with topsoil not already accounted for above.....43.3 acres <br /> 43.3 acres x 43,560 sq.ft./ac x .83(10"depth) / 27 cu.ft./cu.yd. = 57,982 cu. yards topsoil = <br /> 57,982 x 1.1= 63,780 tons <br /> Total volume at maximum build out allowed (2000' of highwall exposed) and the topsoil <br /> requirement of a minimum 10" over 50 acres, this totals 228,147 + 63,780 = 291,927 tons of fill <br /> and planting media to be moved: <br /> In addition, final reclamation will entail grading, seed, cost to apply. <br /> Estimated final grading cost, $100/ac x 50............................. $5000.00 <br /> Estimated seed cost, $1501 acre x 50.................................. $7500.00 <br /> Estimated cost to apply$100/acre x 50................................ $5000.00 <br /> Total re-vegetation cost estimate........................................ $17,500.00 <br />