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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, grams, and Indian ricegrass. <br />Typically, this soil overlies interbedded slightly hard shale and <br />fractured sandstone formations at depths ranging front 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 hiorizon (where present). Eased 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 fortis. 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). Consequentl;~, 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/£6 <br />