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<br />• disturbed land type for soils disturbed by previous sand and gravel mining <br />activities; a Bulkley, rocky phase type for soils that have formed in sand and <br />gravel outcrop material stratigraphically between the lower shale and upper <br />loess parent materials; and a Savage silty clay, eroded phase for soils where <br />the A horizon has been eroded. The following soil types were delineated: <br />7C. Savage silty clay, eroded phase, 3 to 12 percent slopes. This is a deep, <br />well drained soil formed in loess or alluvium on gently to strongly sloping <br />benches, fans, and hillsides at elevations within the permit area of 6565 to <br />6630 feet. The present land use is for agricultural cropland. Depth to sand <br />and gravel is generally greater than 60 inches except in drainages where sand <br />and gravel occur at 3 feet. <br />Typically, the surface layer (A horizon) is dark grayish brown silty clay about <br />9 to II inches thick. The upper subsoil (B horizon) is brown silty clay and <br />silty clay loam about 13 or 14 inches thick. The lower subsoil (B horizon) is <br />brown clay about 9 to 16 inches thick. The substratum (C horizon) is yellow- <br />• ish brown clay to a depth of 60 inches or more. The soil permeability is slow <br />and the available water capacity is moderate. The effective plant rooting <br />depth is 60 inches or more. Surface runoff is medium to rapid. The water <br />and wind erosion susceptibility of this soil when disturbed is moderate. <br />Single lift topsoil salvage will be limited to the upper 22 to 25 inches of <br />surface and subsoil materials. This material exhibits the most favorable <br />organic matter content, pH, SAR, texture, and structure (Table I-5). This <br />stripping depth range can be easily identified in the field by color differ- <br />ences. The suitable material has a color of brown to dark brown as opposed <br />to yellowish brown for unsuitable substratum or overburden material. <br />This soil type occupies 17.2 percent (16.1 acres) of the permit area and 13.1 <br />percent (9.0 acres) of the proposed disturbance area. Approximately 18.0 <br />acre-feet of suitable topsoil will be salvaged from this soil type. <br /> <br />I-5 <br />