PERMFILE71374

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 3/13/2003
• Section_Exhibit Name: Tab 21 Minesoil Reconstruction
• Media Type: D
• Archive: Yes

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 (Yinevada ), or have a light colored surface horizon (Aaberg).
The recommended topsoil salvage depth for both soils is based solely on the thickness of
the mollic epipedon and the depth to the unsuitable silty clay substratum. The in situ
suitable topsoil depth for 1 Lymanson variant profile is 13 inches (Appendix 9-6). The in
situ suitable topsoil depth for 1 Teton profile is 13 inches (Appendix 9-b).
The 33D map unit consists of 45 percent Lymanson variant and 45 percent Teton with 4
percent Splitro, 3 percent Vincvada, and 3 percent Aaberg inclusions (Appendix 9-2, Table
1). 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 - 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 Color ed surface horizon which directly overlies a
thin C horizon and sandstone bedrock at 40 to 60 inches. Adjacent soils are shallower •
(Vinevada and Skyway), have a light colored surface horizon (Roxal variant end Starman),
or have more profile development with subsoil clay accumulation (Lymanson and Fo idel).
The recommended topsoil salvage depth is based primarily on the thickness of the mollic
epipedon end 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 27 Coutis profiles is 51 inches (Appendix 9-6).
The 34C and 34D 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 St arman
inclusions (Appendix 9-2, Table 1).
A 4.0-foot mean salvage depth was used for Xap Units 34C and 34D 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.
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16 Revised OG/24/91