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• 1992 was determined by field survey of existing soil storage stockpiles. The base end <br />existing elevations for each stockpile were completed by the Seneca II-W engineering <br />staff. The "Stock" volume calculating program was used to generate the soil stockpile <br />volumes presented in Table 92.1. As of December 31, 1992, 69.7 acre-feet of soil were <br />stockpiled along the tie across haul road end 541.1 acre-feet of soil were stockpiled in <br />the mine area. <br />Projected soil salvage areas end volumes for the remainder of the first five-year permit <br />term (shown on Exhibit 92.2) were determined es follows. Soil map units for the <br />undisturbed areas are identified on Exhibit 92.2. Individual soil map units to be <br />disturbed by mining activities were digitized to determine the total affected area. <br />Projected soil volumes were determined by multiplying each affected soil map unit area by <br />the respective mean soil selvage thickness. The projected soil salvage areas, soil <br />salvage thickness, and soil volume for each soil type for the remainder of the first <br />permit term are listed in Table 92.2. It is projected that 288.8 acre-feet of soil <br />remain to be selvaged from 235.2 acres of lend within the first permit term. <br />• Soil Balance and Replacement. The soil balance for the first permit term is calculated <br />for Seneca II-W Mine by comparing the disturbance area that requires topsoil replacement <br />as of December 31, 1992 with the soil reserve in stockpiles end soil to be selvaged ahead <br />of mining. The cumulative disturbance area for Seneca II-N Mine, shown on Exhibit 92-1 <br />with exception to the tie-across haul road, totalled 577.8 acres on December 31, 1992. <br />Included in the disturbance area figure are 43.8 acres of soil stockpiles outside of the <br />area to be effected by soil selvage, 19.5 acres for the mine entrance road, 96.6 acres <br />for the tie-acrasa haul road, 14.7 acres where soil was replaced during 1990 and 1991 and <br />1.1 acres where soil was partially replaced during 1992. No soil was selvaged or needs <br />to be replaced beneath the soil stockpile sites. Also, since the mine entrance road, <br />Pond 005, Pond 006, Heul Roed A, and Heul Road G are permanent postmine facilities, soil <br />will not be replaced on 66.5 acres. The disturbance area requiring soil replacement as <br />of December 31, 1992 totals 355.6 acres at the mine site and 96.6 acres for the <br />tie-across haul road (see Table 92.2). <br />There are 590.8 acres of lend et the mine that is or will be disturbed by mining which <br />will receive replaced soil during the firs[ permit term. As of December 31, 1992, there <br />• were 541.1 acre-feet of stockpiled soil end 288.8 acre-feet of soil remaining to be <br />selvaged. This soil (829.9 acre-feet) will be used to cover the 590.8 acre disturbance <br />5 <br />