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Table 2.04.9-3 represents average depths and pH of lift layers for soil salvage materials in the 1998 <br />survey area and which lie in the proposed future area of disturbance as of February 2008. <br />Weighted average lift depth is based on the percent of each soil component including inclusions <br />for each map unit. Appendix 2.04.9-9 lists the percent composition for each soil type in a map unit. <br />Weighted average lift depths are used to calculate volume of salvage material in table 2.04.9-4. <br />Lift layer A is a combination of the following horizons where present: A, Ap, Ag, AB, AC, Bw, and <br />Bt if the pH of those horizon. was less than 8.0. Lift layer B is a combination of the following <br />horizons where present: AC, Bw, and Bt if the pH of those horizons was greater than 8.0 and Bk, <br />Btk, and C horizons. The volumes are shown for a) the full thickness reported from the soil survey <br />and also b) 80% or 90% of the thicknesses from the soil survey, depending upon wether the soils <br />are prime or not. For prime soils, a 90% recovery is used. For non-prime soils, an 80% recovery <br />is used. This reduction is, in most cases, realistic, since the soil survey points do not show some <br />rocky areas that exist between sample points, thickness variations that cannot be fully stripped in <br />the field, and other constraints that occur with large equipment. <br />Table 2.04.9-4 represents the acreage by map unit and the weighted average volume (cubic yards) <br />of soil salvage material by lift layer available in the 1998 soil survey area and which lies in the <br />disturbance area. Soil map unit 98B and 98H and all soil units north of BB Road and west of and <br />including the mine pit are combined into one lift layer for all horizons as cited in 2.05.4(2)(d). <br />(Revised June 2008) 2.04.9-20