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Thus, 2200 cubic yards of Tm topsoil would have to be <br />stockpiled for future mixing with the LTE topsoil during <br />operations in the remaining half of the 1983, 1984A pit area. <br />In a similar fashion, the amount of subsoil required to be <br />stockpiled will be 6,250 yards. <br />When the mining operation in the 1983, 1984A pit area is <br />completed, approximately one-half of the area will have a <br />topsoil thickness of 4 inches, as existing, and one-half of the <br />area will have a topsoil thickness of 6.4 inches. Similar <br />numbers for the subsoil are 14 inches and 21 inches. Upon <br />completion of mining and reclamation, the stockpiles will have <br />been exhausted. <br />The 1984B/C pit has only LTE soil to stockpile. As <br />discussed in the permit, soil losses are expected due to the <br />presence of the pinyon/juniper community. The losses are <br />estimated at 15 percent (Permit, ppg. 257-8). For a total <br />volume of topsoil of 3880 yds. (refer to Table 6.2), the 15 <br />percent loss is 580 yds. A variation for the lose of this <br />amount is requested. The impact on the average soil thickness ' <br />which can be replaced is calculated to be 0.6 inches, as <br />follows. <br />Volume of soil after 15`~ loss:= 0.85 x 3880 yds. =3300 yds. <br />Area to spead soil over: = 7.23 acres <br />Average thickness 3300 x 27 x 12 = 3.4 inches <br />after losses x <br />Percent reduction in thickness: <br />(4.0-3.4) x 100 = 15 `~ <br />~i-6- <br />