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3~7 <br />3,2 TOPSOIL REMOVAL AND STORAGE <br />• Two soil units occur in the 0.5 acre area of the sediment pond, the Rivra gravely sand loam <br />variant (0.2 acres) and Nihill loam (0.3 acres). Recommended stripping depths are 12 inches <br />and 18 inches, respectively, based upon data presented in Table 4.4-2, Soils Inventory, McClane <br />Canyon Mine (WRDC 1982a). <br />Volumes of topsoil available for stripping and stockpiling have been calculated from the area <br />of the soil mapping units and recommended stripping depths. A total of 0.56 acre-feet (900 <br />bcy) of soil will be salvaged from the sediment pond area. <br />The topsoil storage area is adjacent to the sediment pond. Vegetation will be stripped from <br />the storage area prior to stockpiling. The stockpile area is about 8,400 sgft (0.2 acre). The <br />volume of material to be stockpiled is about 1.24 acre-feet (2,000 bcy) and the stockpile will <br />reach a height up to 10 feet. The salvaged soil should have good characteristics. It will be <br />imperfectly mixed, but the soil characteristics are shown below: <br />Characteristic Avera¢e Ran e <br />Texture Scl-SI SI-L <br />Electrical Cond. 0.6 mmhos/cm 0.5 to 0.9 mmhos/cm <br />SAR 1.0 0.2 to 1.3 <br />pH 7.0 6.3 to 8.0 <br />Organic Matter 0.6% 0.2-0.9% <br />Gravels <10% 0-40% <br />Water Availability 0.8in/in 0.5-1.0 in/in <br />Permeability mod. rapid mod. rapid to rapid <br />During storage the topsoil stockpile will be stabilized with a perennial vegetation cover of 5 <br />Ib/ac Western Wheat grass - Arriba, 5 Ib/ac Streambank Wheat grass- Sodar, and 5 Ib/ac <br />Thickspike Wheat grass - Critana. Weed cover will be controlled via the most appropriate <br />i technique. This will decrease problems with weed competition during final reclamation. <br />M~ Volume 1 4-29.96 <br />