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<br />• Typically, the surface layer (A horizon) is very dark grayish brown silt loam <br />about I I inches thick. The upper subsoil (B horizon) is dark brown silty clay <br />loam about 20 inches thick. The lower subsoil (B horizon) is yellowish brown, <br />brown silty clay abouT I I inches thick. The substratum (C horizon) is yellow- <br />ish brown silty clay to a depth of 60 inches or more. The soil permeability is <br />slow and the available water capacity is moderate to high. The effective <br />plant rooting depth is 60 inches or more. Surface runoff is very slow to <br />slow. The water and wind erosion susceptibility of this soil when disturbed is <br />high. <br />Topsoil will be handled using a single lift salvage and replacement method. <br />The 31 inch dark colored surface (A) and upper subsoil (B) horizons will be <br />salvaged. This material exhibits the most favorable saturation percentage, <br />organic matter content, pH, texture, and structure for reclamation tillage, <br />seedbed preparation, and root growth compared to the less suitable deeper <br />subsoil and substratum (Table I-5). Topsoil salvage will be discontinued <br />should clay percentages in any horizon exceed 45 percent. <br />• The stripping depth ranges can be easily identified in the field by color <br />differences. The A and upper B horizon material has a color of very dark <br />grayish brown to dark brown compared to yellowish brown for the unsuitable <br />lower subsoil and substratum or overburden material. The lower subsoil and <br />substratum or overburden material are not to be salvaged because of high <br />saturation percentages (>70%) and many white violently effervescent salt <br />deposits. <br />This soil type occupies 46.0 percent (43.1 acres) of the permit area and 43.0 <br />percent (29.8 acres) of the proposed disturbance area. Therefore, 77.0 acre- <br />feet of suitable topsoil will be salvaged from this soil type. <br />9A. Hesperus silt loam, 0 to 3 percent slopes. This is a deep, well drained <br />soil formed in Icess or alluvium on level to gently sloping benches and fans at <br />elevations within the permit area of 6605 to 6620 feet. The present land use <br />is for agricultural cropland. Depth to sand and gravel is greater than 60 <br />• inches. <br />I-10 <br />