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siTU suitable topsoil depth far 9 profiles is 33 inches (Appendix 9-6). <br />The 2VD and 2VE map units consist of 85 percent Routt with 5 percent 4inevada, 3 percent <br />each of Splitro and Cochetopa, 2 pert ent Aaberg, and 1 percent each of Coutis and Binco <br />inclusions (Appendix 9-2, Table 1). A 2.5-foot mean salvage depth was used for Map Units <br />2VD and 2VE [o calculate recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-1. <br />This topsoil salvage depth figure accounts for inclusions and topsoil loss during salvage <br />due to brush clearing. <br />AD-Abor Clay. The Abor clay map unit occurs on the moderately steep hillsides and <br />sideslopes along the tie across haul road corridor. The soil profile is moderately deep <br />with a thin light colored surface horizon uh ich overlies a clay subsoil and substratum. <br />Adjacent Bulkley soils have deep profiles. <br />The entire Abor clay profile is an unsuitable topsoil source due to excessive clay content <br />(Appendix 9-b). <br />• <br />The 4D map unit consists of 90 percent Abor with 10 percent Bulkley inclusions (Appendix <br /> <br />T <br />0 feet <br />9-2 <br />bl <br />1) <br />A 0 <br />mean salva <br />th was <br />d <br />used f <br />m <br />it t <br />thi <br />l <br />t <br />l • <br />a <br />e <br />. <br />. <br />, ge <br />ep or <br />s <br />ap un <br />o ca <br />e <br />cu <br />a <br />recoverable topsoil volumes listed in Table 21-1 and Exhibit 9-2. <br />5A-gpicer[on Variant (frigid summer soil temperatures) LLay. The Spicerton variant map <br />unit occurs on nearly level to gently sloping alluvial fans and stream bottoms along the <br />tie-across haul road corridor. The soil profile is deep and well developed with subsoil <br />clay, sodium, and salt accumulation zones. Adjacent Bulkley soils lack subsurface <br />accumulations of clay, sodium, and salt. <br />Spicerton variant is typically an unsuitable topsoil source due to saline and sodic <br />conditions coupled with high clay contents and very firm consistencies (Appendix 9-6). <br />The 5A map unit consists of 40 percent Spicerton variant with 10 percent Bulkley <br />inclusions (Appendix 9-2, Table 1). A 0.0-foot mean salvage depth was used (or most of <br />this map unit [o calculate recoverable topsoil volumes Listed in Table 21-1 and Exhibit <br />9-2. The surface 0.5 feet of topsoil from 7.2 acres of Map Unit SA in the vicinity of <br />Sage Creek is suitable for salvage as shown on Exhibit 9-2. • <br />12 Revised 06/2</91 <br />