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suitability limitations. The soil occurs on moderately steep to very <br /> steep, dissected slopes; is shallow to very shallow over bedrock; and <br /> has a very high coarse fragment content. The mean soil depth for the <br /> three sampled locations (Table 9-4-4) is 7 inches , while mean coarse <br /> fragment contents were about 35 percent in the 4-inch thick A horizon <br /> and about 60 percent in the C horizon. Consequently, only four inches <br /> of suitable topsoil is available for salvage within Map Unit 1. <br /> Map Unit 2 - Persayo Variant Sandy Loam, 2 to 15 Percent Slopes <br /> This map unit is associated with the gently to moderately sloping mesas <br /> and upper sideslopes of upland benches. Vegetation consists primarily <br /> of sagebrush, juniper, cheatgrass, grama, and Indian ricegrass. <br /> Typically, this soil overlies interbedded slightly hard shale and <br /> fractured sandstone formations at depths ranging from 5 to 12 inches. <br /> This soil represents 7.4 percent of the study area (Table 9-4-3) . <br /> All chemical and physical data, with the exception of coarse fragment <br /> content and calcium carbonate percentage, are suitable for this map <br /> unit (Tables 9-4-2 and 9-4-5) . The most limiting factor for using this <br /> soil for topsoil is the high coarse fragment content (up to 60 percent) <br /> of the lower C horizon. The mean soil depth for six sampled locations <br /> (Table 9-4-4) is about 10 inches. Coarse fragment contents range from <br /> 10 to 40 percent in the A and C1 horizons and up to 60 percent above the <br /> paralithic contact in the C2 horizon (where present) . Based upon six <br /> profiles , about nine inches of suitable topsoil is available for salvage <br /> within Map Unit 2. <br /> Map Unit 3 - Persayo Variant Sandy Clay Loam, 6 to 15 Percent Slopes <br /> This map unit is associated with moderately sloping upland benches and <br /> associated sideslopes. Vegetation consists predominantly of cheatgrass <br /> and forbs. The upper horizons (A and C1) of this soil unit were <br /> disturbed by previous mining activity (i .e. , topsoil stockpiles, light <br /> use roads, ahead of mining topsoil salvage) . Consequently, this soil <br /> overlies sandstone bedrock at depths ranging from 0 to 6 inches. This <br /> soil represents 1.9 percent of the study area (Table 9-4-3) . <br /> 9-4-22 Revised 11/01/86 <br />