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overlies a clay subsoil and substratum. This soil has a deeper profile than Abor, has a • <br />lighter colored surface horizon Chan Xorapas, and lacks a sodic clay accumulaticn zone <br />like Spicerton variant. <br />The recommended topsoil salvage depth is based exclusively on the thickness of the surface <br />A horizon since subsurface clay levels ere unsuitable. The ct ay content at the surface <br />is alleviated by a friable consistence, a moderate saturation percentage, and a higher <br />organic matter content. Topsoil salvage should be terminated at the top of the cambic <br />(8w) horizon. The mean in situ suitable topsoil depth for four profiles is eleven inches <br />(Appendix 9-6). <br />The 108, 10C, and 10D map units consist of 85 percent Bulkley with b percent each of Abor <br />and Spicerton variant, and 3 percent Morapos inclusions (Appendix 9-2, Table 1), p <br />1.0-foot mean salvage depth was used for these map units to calculate recoverable topsoil <br />volumes listed in Table 21-1 end Exhibit 9-2. <br />11C, 11D-Binco Clay Loam, The Binco clay loam map units occur on the strongly sloping to <br />moderately steep colluvial fans, sideslopes, end toeslopes. The soil profile is deep with <br />a thin light colored surface horizon which overlies a clay subsoil and substratum. • <br />Adjacent Aaberg and Aaberg variant soils have moderately deep and shallow profiles, <br />respectively- Buckskin soils have dark colored surface horizon and subsoil clay <br />accumulation. <br />The recommended topsoil salvage depth is based on the thickness of the surface horizon <br />since subsurface Clay levels are unsuitable. Topsoil selvage shoultl be terminated near <br />the top of the Iambic (Bw) horizon. The mean in situ suitable topsoil depth for 12 <br />pr ofiLes is 5 inches (Appendix 9-6). <br />The 11L and 11D map units consist of 85 percent Binco with 7 percent Aaberg, 5 percent <br />Buckskin, end 3 percent Aaberg variant inclusions (Appendix 9-2, Table 1). A 0.5-foot <br />mean salvage depth was used for these map units to calculate recoverable topsoil volumes <br />listed in Table 21-1 and Exhibit 9-1. <br />12C, 12D, 12E-Buckskin Loam. Buckskin loam soils occur on strongly sloping to steeply <br />sloping mountain sideslopes and ridgetops. The soil profile is deep and well developed • <br />14 Revised 04/24/91 <br />