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State Reg. <br />will be followed because the postmine land will be used predominantly for <br />wildlife and grazing. This recommended recovery depth permits a greater <br />percentage of coarse fragments in salvaged topsoil (up to 35-40%, see <br />B.L.M. Guideline - 1977). This will not affect the postmine land use since <br />the regraded mine land will not be tilled annually by farm implements. The <br />topsoil volume totals were also adjusted by soil type (recommended by Fly <br />Associates, Tab 9, Table 7) to account for unuseable inclusion areas which <br />might include shale or sandstone outcrops and areas where coarse fragment <br />contents ore greater Than 40 percent. <br />ALLUVIUM, MIXED -UNIT ~~AW; 0-3% SLOPES. The "A" horizon is <br />predominantly 0.8 feet thick. Generally, 4.2 feet of "B" horizon material <br />can be salvaged. There are approximately 11.6 acres of this nearly level <br />mixed alluvium soil on the proposed permit disturbance areo. Therefore, <br />about 55.1 acre-feet of suitable topsoil are expected from the mine site <br />(Table 9-I-I). <br />AABERG SILTY CLAY -UNIT #35E, 20-40% SLOPES AND UNIT d~35F, • <br />>40% SLOPES. The "A" horizon to be salvaged is predominantly 0.7 feet <br />thick. Salvage of the lighter colored "B" and "C" horizon material is not <br />recommended since the clay content exceeds 50 percent and the orgonic <br />matter content is low. There are approximately 51.9 acres of these steep to <br />very steeply sloping Aaberg soils on the proposed mine disturbance area. <br />These map units should yield about 34.5 acre-feet of surface soil from the <br />mine site (Table 9-I-I). <br />BINCO CLAY -UNIT ;'/IOD, 10-20% SLOPES; UNIT /i`IOE, 20-40% SLOPES; <br />AND UNIT i<IIOF, >40% SLOPES. Topsoil salvage from these units will be <br />limited to the organic matter rich "A" horizon which is predominantly 0.7 <br />feet thick. Salvage of subsurface lighter colored horizons ("B" and "C") is <br />not recommended because clay content exceeds 60 percent. There are <br />approximately 46.1 acres of moderately sloping to very steeply sloping Binco <br />soil within the proposed mine disturbance area. These soil units should yield <br />about 30.7 acre-feet of suitable topsoil from the mine site (Table 9-I-I). -• <br />9-4 <br />