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• the 236 map unit consists of 90 percent Gapo variant and 10 percent Routt variant <br /> inclusions. A 0.5-foot mean salvage depth was used for this map unit to calculate topsoil <br /> volumes listed in Table 9-7-1 and Exhibit 9-1. This topsoil salvage depth figure accounts <br /> for high ground water levels and saturated soil conditions in portions (about 30 percent) <br /> of this unit. <br />25E-Binco-Aaberg Silty Clay Complex. This map unit is located on the steep toe slopes, <br />benches, and rounded tops of ridges and knolls to the east of Bond Drainage. The soil <br />profiles have thin light colored surface horizons which overlie a clay subsoil and <br />substratum. Aaberg has a moderately deep profile whereas Binco profiles are deep. <br />Adjacent Buckskin and Routt soils have dark colored surface horizons and subsoil clay <br />accumulation. <br />The recommended topsoil salvage depth is based exclusively on the thickness of the surface <br />ochric epiped on since subsurface clay levels are unsuitable. The mean in situ suitable <br />topsoil depth for 1 Aaberg and 3 Binco profiles is 0.5 feet. <br />• The 25E map unit consists of 60 percent Binco and 30 percent Aaberg with 5 percent each of <br />Buckskin and Routt inclusions. A 0.5-foot mean salvage depth was used for this map unit <br />to calculate topsoil volumes presented in Table 9-7-1 and Exhibit 9-1, <br />53E-Wineveda Silt Loam. The Wineveda silt loam is located on the steep, upper drainage <br />si desl opes and bottoms to the west of Bond Drainage. The soil profile has a thick, dark <br />colored surface horizon which directly overlies sandstone bedrock at 20 to 40 inches. <br />Adjacent soils are shallower (Splitro), deeper (Coutis), or have more profile development <br />with subsoil clay accumulation (Skylick). <br />The recommended topsoil salvage depth is based exclusively on the depth to sandstone <br />bedrock. The mean in situ suitable topsoil depth for 7 Wineveda profiles is 2.5 feet. <br /> The 53E map unit consists of 75 percent Wineveda with 10 percent Skylick, 10 percent <br /> Splitro, and 5 percent Coutis inclusions. A 2.0-foot mean salvage depth was used for this <br /> map unit to calculate topsoil volumes listed in Table 9-7-1 and Exhibit 9-1. This topsoil <br /> salvage depth figure accounts for topsoil loss during salvage due to brush clearing and <br />• steep sl opes. <br />9-7-7 Revised 05/16/88 <br />