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situ suitable topsoil depth for 9 profiles is 33 inches (Appendix 9-61. <br />The 2VD and 2VE map units consist of 85 percent Routt with 5 percent Winevada, 3 percent each of <br />Splitro and Cochetopa, 2 percent Aaberg, and 1 percent each of Coutis and Binco inclusions (Appendix <br />9-2, Table 11• A 2.5-foot mean salvage depth was used for Map Units 2VD and 2VE to calculate <br />recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-1. This topsoil salvage depth figure <br />accounts for inclusions and topsoil loss during salvage due to brush clearing. <br />4D-Abor Clay. The Abor clay map unit occurs on the moderately steep hillsides and sideslopes along <br />the tie across haul road corridor. The soil profile is moderately deep with a thin light colored surface <br />horizon which overlies a clay subsoil and substratum. Adjacent Bulkley soils have deep profiles. <br />The entire Abor clay profile is an unsuitable topsoil source due to excessive clay content (Appendix 9- <br />61. <br />The 4D map unit consists of 90 percent Abor with 10 percent Bulkley inclusions (Appendix 9-2, Table <br />11• A 0.0 feet mean salvage depth was used for this map unit to calculate recoverable topsoil volumes <br />listed in Table 21-1 and Exhibit 9-2. <br />SA-Spicerton Variant (frigid summer soil temperatures) Clay. The Spicerton variant map unit occurs on <br />nearly level to gently sloping alluvial fans and stream bottoms along the tie-across haul road corridor. <br />The soil profile is deep and well developed with subsoil clay, sodium, and salt accumulation zones. <br />Adjacent Bulkley soils lack subsurface accumulations of clay, sodium, and salt. <br />Spicerton variant is typically an unsuitable topsoil source due to saline and sodic conditions coupled <br />with high clay contents and very firm consistencies (Appendix 9-61. <br />The 5A map unit consists of 90 percent Spicerton variant with 10 percent Bulkley inclusions (Appendix <br />9-2, Table 11. A 0.0-foot mean salvage depth was used for most of this map unit to calculate <br />recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-2. The surface 0.5 feet of topsoil from <br />7.2 acres of Map Unit 5A in the vicinity of Sage Creek is suitable for salvage as shown on Exhibit 9-2. <br />12 Revised Ofi/24/91 <br />