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• Soil Balance and Replacement The soil balance is calculated for Seneca II-W Mine by comparing the disturbance area that requires soil replacement as of December 31, 1996 with the soil reserve in stockpiles. The disturbance area for Seneca II-W Mine, shown on Drawing 2W96-2A, with exception to the tie- across haul road, totaled 585.1 acres on December 31, 1996. No soil was salvaged or needs to be replaced beneath the soil stockpile sites. Also, since Pond 005 (4 .8 acres), Pond 006 (7.9 acres), the Mine Entrance Aoad, Haul Road A, and Haul Road G are permanent postmine facilities (11.2 acresl, soil will only be replaced on a portion of those roads effectively narrowing them to 20 Eeet wide. Topsoil has been replaced on 128.9 acres of disturbed area through December 31, 1996. Therefore, the to [al disturbance area requiring topsoil ae of December 31, 1996 was ,432.3 ~a cres at the mine site and 916.6 acres for the tie-across haul road. ~-~I ~i a ~~ _ °~`~I ~~ `~' 93z.3 Soil Replacement Thickness The soil replacement thickness for the first five-year permit term was projected [o be 1.3 feet for [he mine area and 0.7 feet Eor the tie-across haul road. The soil balance as of • December 31, 1996 was calculated as follows: Mine Area Total disturbance area = 585 .1 acres Permanent Facilities 6 Topsoil replaced = (152 .8)acres Die turbance area requiring soil = 432 .3 acres Sail in stockpiles (Table 96.1) = 527 .4 acre Eeet Mean replacement depth = 1 .2 Eeet Tie Across Haul Road Disturbance area requiring soil = 36.6 acres Soil in stockpiles (Table 96.1) = 69.7 acre- feet Mean replacement depth = 0.7 feet Hy dividing the soil available by the area requiring soil replaced, we arrive at the 1996 soil balance thickness of 0.7 feet for the tie-across haul road and 1.2 feet for the mine area. • 4