2012-01-06_PERMIT FILE - C1982057 (33)

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Lymanson variant has a shallow profile whereas Teton profiles are moderately deep. Adjacent soils are shallow and lack subsoil clay accumulation (Splitro), have a thicker mollic epipedon IWinevadal, or have a light colored surface horizon (Aabergl. The recommended topsoil salvage depth for both soils is based solely on the thickness of the mollic epipedon and the depth to the unsuitable siky clay substratum. The in situ suitable topsoil depth for 1 Lymanson variant profile is 13 inches (Appendix 9-61. The in situ suitable topsoil depth for 1 Teton profile is 13 inches (Appendix 9-61• The 33D map unit consists of 45 percent Lymanson variant and 45 percent Teton with 4 percent Splitro, 3 percent Winevada, and 3 percent Aaberg inclusions (Appendix 9-2, Table 11. A 1.0-foot mean salvage depth was used for this map unit to calculate recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-1. This topsoil salvage depth figure accounts for inclusions and topsoil loss during salvage due to brush clearing. 34C, 34D, 34E -Coutis Silt Loam. Coutis silt loam soils occur on the strongly sloping to moderately steep bedrock controlled concave sideslopes and upland swales or drainages. The soil profile has a very thick, dark colored surface horizon which directly overlies a thin C horizon and sandstone bedrock at 40 to 60 inches. Adjacent soils are shallower (Winevada and Skywayl, have a light colored surface horizon (Roxal variant and Starman), or have more profile development with subsoil clay accumulation (Lymanson and Foidell. The recommended topsoil salvage depth is based primarily on the thickness of the mollic epipedon and depth to sandstone bedrock. Topsoil salvage will typically be terminated at the sandstone bedrock contact; however, salvage will be discontinued at a shallower depth if loamy sand or skeletal strata is encountered above the bedrock. The mean in situ suitable topsoil depth for 21 Coutis profiles is 51 inches (Appendix 9-6). The 34C, 34D and 34E map units consist of 85 percent Coutis with 5 percent Foidel, 3 percent Winevada, 2 percent each of Skyway, Roxal variant, and Lymanson, and 1 percent Starman inclusions (Appendix 9-2, Table 11. A 4.0-foot mean salvage depth was used for Map Units 34C, 34D and 34E to calculate recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-1. This topsoil salvage depth figure accounts for inclusions and topsoil loss during salvage due to brush clearing. PR03 16 Revised 7/02