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Generally, those soils which have a very high percentage of clay near the soil surface • have little suitable topsoil to be salvaged. Only O.5 feet of topsoil is salvageable from the Binco-Aaberg silty clay complex (25E) mapping unit. Topsoil Salvage Depths. The suggested salvageable depths of topsoil material presented in this section are based on laboratory data and extensive field observations, and represent only the most suitable sources of topsoil material. No unsuitable sources of topsoil will be salvaged and used during reclamation activities. Topsoil sa wage depths, presented in Table 9-7-1 and Exhibit 9-1, and approved for the East Wadge Extension Area revision, were determined in one-half foot increments after considering soil loss attributed to brush clearing, slope steepness, and unsuitable inclusions (coarse fragments and shallow bedrock). Topsoil salvage depths and characteristics for each soil map unit to be disturbed within the North Wadge Deadhead Area are summarized in Attachment 9-1 and 9-7. Topsoil Salvage Areas. Topsoil will be salvaged from the projected disturbance area shown on Exhibit 12-1, Operations Plan. The additional North Wadge Deadhead topsoil disturbance area was determined by overlaying the Operations Plan, Exhibit 12-1 with the Topsoil Balance Plan - 1988 Field Season, Exhibit 2, scheduled to be submitted to CMLRD on April • 15, 1989 with the third annual Topsoil and Spoil Monitoring Report. The difference between the two topsoil disturbance lines is 28.9 acres. Table 9-8-1 lists the affected area of each soil map unit within the proposed flo rth Wadge Deadhead Area and the topsoil salvage thickness, volume, and limitations for each unit. A one-lift soil handling operation will be utilized for all soil map units within the projected disturbance area. This method of topsoil removal is desirable within the North Wadge Deadhead Area because the soils are either shallow (Splitro) to moderately deep (Wineveda) and have minimal subsoil profile development (thick, organic-rich "A" horizons directly overlie sandstone bedrock), landscape slopes are steep to excessive (equipment mobility and efficiency is severely restricted), mixing may provide a more erosion resistant and stable seedbed surface (Skylick), and/or only the "A" horizon is salvageable (Aaberg, Binco, and Routt) due to excessive clay contents in lower horizons. The major topsoil salvage limitations will be the surface silty clay texture of map unit 25E; the subsurface clay and silty clay textures of map units 2VE and 25E; steep slopes; and shallow to moderately deep sandstone bedrock associated with map units XBE and 53 E. 9-8-4 Revised 04/06/89