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TABLE 20-1 <br />PO STMINING LANDFO RM MASS BALANCE <br />Premin in9 Pit Material Volume Calculations <br />Premining Material Volume 49,694,919 cy <br />Virgin Overburden Material Volume 9,073,200 cy <br />Total In-place Coal Volume 9,621,719 cy <br />Recoverable Coal Volume 9,010,123 cy <br />Non-recovered Coal and Parting Material Volume 11,596 cy <br />Premining Overburden Volume 40,684,796 cy <br />Total Pit Spoil Volume 46,909,570 cy <br />Premining Material Mass Volume <br />Total Pit Spoil Volume =46,909,570 cy <br />Total Premining Material Volume =49,694,919 cy <br />Volume to Achieve Premining Original Ground Surface =2,785,349 cy <br />% Difference = -5.6% <br />Average Elevation Change of Disturbed Lands =-3.7 ft. <br />Postmining Material Volume Calculations <br />Postmining Spoil Material Calculated: <br />Postmining Spoil Material Volume Ilnternall 46,878,503 cy <br />Postmining Spoil Material Volume (External) 348,505 cy <br />Total Postmining Spoil Volume 7,227,008 cy <br />Postmining Overburden Material Excavated <br />Premining Total Pit Spoil Volume 46,909,570 cy <br />Postmining Overburden Material (External) 1,627,342 cv <br />Total Overburden Material Excavated (Swelled) 48,536,912 cy <br />Postmining Material Volume Comparison <br />Total Postmining Spoil Volume 47,227,008 cy <br />Total Overburden Material Excavated 48,536,912 cy <br />Volume Difference 1,309,904 cy <br />Difference = -2.7% <br />6 Revised 9/98 <br />