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• elevations for each stockpile were completed by the Seneca II-W engineering staff. The <br />stockpile volumes as of December 31, 1998 are listed in Tab1C 98.1. A9 of December 31, <br />1998, 69.7 acre-feet of soil were stockpiled along [he tie-across haul road and 566.9 acre- <br />fee[ of soil were stockpiled in the mi nl ng area. <br />Soil Balance and Replacement <br />The soil balance is calculated for Seneca II-W Mine by comparing the disturbance area that <br />requires soil replacement as of December 31, 1998 with the soil reserve in stockpiles. The <br />disturbance area for Seneca II-W Mine, shown on drawing 2W 98 -2A, with exception [o the tie- <br />across haul road, totaled 705.1 acres on December 31, 1998. No soil was salvaged or needs <br />to be replaced beneath [he soil stockpile sites. Also, since Pond 005 X4.8 acresl, Pond <br />006 (7,9 acres, the Mine Entrance Road, Haul Road A, and Haul Road G are permanent <br />postmine facilities X11.2 acres~r sorl will only be replaced on a portion of those [o ads <br />effectively narrowing them [0 20 feet wide. Topsorl has been replaced on 218.8 acres of <br />disturbed area through Decembe[ 31, 1998. Therefore, the total disturbance area requiring <br />topsoil as of December 31, 1998 was 462.4 acres at the mr ne site and 96.6 acres for the <br />tie-across haul road. <br />• So 11 Replacement Thickness <br />The soil replacement thickness for [he first five-year permit term was projected [o be 1.3 <br />feet for the mine area and 0.7 feet for the tie-across haul road. The soil balance as of <br />December 31, 1998 was calculated as fellows: <br />MSne Area <br />Total disturbance area = 705. 1 acres <br />Permanent Facilities 6 Top soil replaced = (242 . 7~ acres <br />Disturbance area requiring soil 462. 4 acres <br />Soil in stockpiles Table 98.1) = 566. 9 acre-feet <br />Mean replacement depth = 1. 23 feet <br />Tie Across Haul Road <br />Disturbance area requiring soil = 96.6 acres <br />Soil 1n stockpiles Table 98.1 = 69.7 acre-fee[ <br />Mean replacement depth = 0.7 fee[ <br />• By dividing the soil available by [he area requiring soil replaced, we arrive at the 1998 <br />soil balance thickness of D.7 feet for the [. e-across haul road and 1.23 fee[ for [he mine <br />area. <br />4 <br />