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The recommended topsoil salvage depth is based solely on the depth to sandstone hedrock. The mean in situ suitable topsoil depth for 30 4inevada profiles is 28 inches (Appendix 9-6). The 53C, 53D, 53E, end 53F map units consist of 85 percent Vinevede with 5 percent Splitro, 4 percent Coutis, 4 percent Foidel, 1 percent Roxal variant, end 1 percent Starman inclusions (Appendix 9-2, Table 1). A 2.0-foot mean salvage depth was used for Nap Units 53C, 53D, 53E, and 53F to calculate recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-7. This topsoil salvage depth figure accounts for inclusions and topsoil loss during salvage due to brush clearing. 62C, 62D-Chaperton Sandy Clay Loam. The Chaperton sandy clay loam soil occurs on strongly sloping to moderately steep mountain toeslopes, sideslopes, end alluvial fens. This soil has more profile development (structurally developed subsurface horizon) then the adjacent Torriorthents but lacks the thick, dark colored surface horizon associated with Silas. This soil is a good source of loamy topsoil. The mean in situ suitable topsoil depth for • 3 Chaperton profiles is 60 inches (Appendix 9-b). The 62C and 62D map units consist of 85 percent Chaperton with 8 percent Torriorthents end 7 percent Silas inclusions (Appendix 9-2, Table 1). A 4.5-foot mean salvage depth was used for these map units to calculate recoverable topsoil volumes listed in Table 21-1 end Exhibit 9.7. This topsoil salvage depth figure accounts for inclusions within these map units. - 66D-Foidel Silt Loam. The foidel silt loam soil is located on moderately steep mountain sideslopes, ridgeline benches, and sweles. The soil profile is deep and well developed with a thick, dark colored surface horizon and subsoil clay accumulation. Adjacent soils have higher subsoil clay contents (ROUtt and Coche[opa) or lack subsoil clay accumulation (Coutis end Vinevada). The recommended topsoil salvage depth is typically based on the entire soil profile since all horizons have favorable chemical and physical properties. Occasionally, topsoil salvage must be discontinued et the top of subsoil or substratum horizons which have • unsuitable clay contents or consistency characteristics. The mean in situ suitable topsoil depth for 19 profiles is 57 inches (Appendix 9-6). 79 Revised 04/24/97