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<br />• R 10 and IOE. Bulkley clay loam rocky phase and Bulkley clay loam, 12 to 25 <br />percent slopes. This is swell-drained soil formed in mixed channel deposited <br />alluvium (sand and gravel) often over residual shale on strongly sloping to <br />steep sideslopes at elevations within the permit area of 6,565 to 6,600 feet. <br />The sand and gravel outcrop material in Type RIDE occurs at the higher <br />elevations. Sand and gravel parent material thickness varies from 0 to more <br />than 60 inches. The present land use is rangeland. <br />Typically, the surface layer is very dark brown to black loam to silty clay <br />loam, about 6 to 9 inches thick. The rocky phase often contains 5 to 15 <br />percent by volume gravel and cobble size fragments in surface, subsoil, <br />.and/or substratum. The upper subsoil is dark brown sandy clay about 5 to 19 <br />inches thick. The lower subsoil is dark yellowish brown clay. The substra- <br />tum is yellowish brown sandy clay or clay to a depth of 60 inches or more. <br />• <br />u <br />The soil permeability is slow and the available water capacity is moderate. <br />The effective plant rooting depth is 60 inches or more. Surface runoff is <br />medium to rapid. The water and wind erosion susceptibility of this soil when <br />disturbed is moderate to high. <br />Single lift topsoil salvage will be limited to the upper 14 to 26 inches of <br />surface and subsoil material. This material exhibits the most favorable <br />organic matter content, pH, texture, structure, and saturation percentage <br />(Table I-5). This stripping depth range can be easily identified in the field by <br />color differences. The suitable material has a color of brown to black op- <br />posed to yellowish brown for unsuitable substratum or overburden material. <br />This soil type occupies 2.1 percent (2.0 acres) of the permit area and 2.1 <br />percent (1.4 acres) of the proposed disturbance area. Approximately 2.3 <br />acre-feet of suitable topsoil will be salvaged from this soil type. <br />7A. Savage silt loam, 0 to 3 percent slopes. This is a deep, well drained soil <br />formed in loess or alluvium on level to gentle 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-9 <br />