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• 7B, 7C-Morapos Clay Loam. The Morapos clay loam map units occur an the gently to strongly <br />sloping hillsides and benches along the tie-across haul road corridor. The soil profile <br />is deep and well developed with a dark colored surface horizon and subsoil clay <br />accumulation. Adjacent Bulkley soils lack a mollic epipedon and an argillie horizon. <br />The recommended topsoil selvage depth is based exclusively on the thickness of the surface <br />mollic epipedon and transitional horizons since subsurface clay levels are unsuitable. <br />Topsoil salvage should be terminated at the top of the argillic (Bt) horizon. The in situ <br />suitable topsoil depth for 1 profile is 13 inches (Appendix 9-6). <br />The 78 and 7C map units consist of 90 percent Morapos with 10 percent Bulkley inclusions <br />(Appendix 9-2, Table 1). A 1.0-foot mean salvage depth was used for these map units to <br />calculate recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-2. <br /> %BD, %BE, %BF-Yinevada-Splitro Loem Complex. These map units are located on the <br /> moderately steep to very steep bedrock controlled sideslopes, swales, end ridges. These <br /> soils are shallow to moderately deep, lack significant subsoil/substratum profile <br /> development, end typically have a fine-loamy particle size control section. <br />• <br />The recommended topsoil selvage depth for both soils is based solely an the depth to <br />sandstone bedrock. The mean in situ suitable topsoil depth for 26 Splitro profiles is 16 <br />inches (Appendix 9-b). The mean in situ suitable topsoil depth for 30 Yinevada profiles <br />is 28 inches (Appendix 9-6). <br />The xBD, %8E, and %8F map units consist of 50 percent Vinevada and 35 percent Splitro Vith <br />4 percent each of Coutis end Foidel, 2 percent Cochetopa variant, and 1 percent each of <br />Routs, Skyway, Aaberg, Binco, and Rock Outcrop inclusions (Appendix 9-2, Table 1). A <br />2.0-foot mean salvage depth was used for Map Units XBD, %8E, and %8F to calculate <br />recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-1. This topsoil selvage <br />depth figure accounts for inclusions and topsoil loss during salvage due to brush <br />clearing. <br /> 108, 10C, 10D-Bulkley Clay. The Bulkley clay map units occur on the gently sloping to <br /> moderately steep hillsides and colluvial sideslopes along the tie-across haul road <br /> corridor. The soil profile is deep with a thin light colored surface horizon which <br />. <br />13 Revised O4/2L/91 <br />