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with a dark colored surface horizon and subsoil clay accumulation. This soil has a <br />thinner surface horizon than either Cochetopa or Routt. Adjacent fl(nco profiles lack a <br />mollic epipedon end argillic horizon. <br />The recommended topsoil salvage depth is based solely on the thickness of the surface <br />mollic epipedon and adjacent, underlying transitional horizons. Topsoil salvage should <br />typically be terminated at the top of the argillic (Bt) horizon. The upper portion of the <br />argillic horizon in a few profiles is marginally suitable due to acceptable saturation <br />percentages, consistency, and organic matter contents. The mean in situ suitable topsoil <br />depth for 18 profiles is 20 inches (Appendix 9-6). <br />The 12E map unit consists of 85 percent Buckskin with 5 percent Buckskin variant <br />(moderately deep), 4 percent Binc o, 3 percent Cochetopa, and 3 percent Routt inclusions <br />(Appendix 9-2, Table i). A 7.5-foot mean salvage depth was used for Map Units 12C, [2D, <br />and 12E to calculate recoverable topsoil volumes listed in Table 21.1 and Exhibit 9-1. <br />ih is topsoil salvage dap ch figure accounts for inclusions and topsoil Loss during salvage <br />due to brush clearing. <br />• 27A-Silas loam. Silas loam sot is occur on nearly level to gently sloping alluvial fans <br />and valley bottoms. This soil is deep, has a thick, dark colored surface horizon, and <br />lacks significant subsoil/substratum profile development. Adjacent soils ere wetter <br />(Venable) or Lack a mollic epipedon ([hope rt on). <br />The recommended topsoil salvage depth is based on the thickness of the surface mollic <br />epipedon and the average depth to unsuitable, subsurface clay lenses. The mean in situ <br />suitable topsoil depth for G profiles is 43 inches (gppendix 9-6). <br />The 27A map unit consists of 90 percent Silas with 5 percent Chaperton and 5 percent <br />Venable inclusions (Appendix 9-2, Table 1). A 3.5-foot mean salvage depth was used for <br />ch is map unit fo calculate recoverable topsoil volumes listed in Table 21-7 and Exhibit <br />9. 1. <br />33D-Lymanson Variant (shallow)-Teton Complex. This map unit is located on moderately <br />steep colluvial sideslopes in the northern portion of the mine area, The soil profiles <br />• have dark colored surface and subsoil horizons which overlie a silty clay substratum. <br />15 Revised 04/24/91 <br />