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crested and thickspike wheatgrass, smooth brome, and saltbush. This map <br /> unit occurs in areas which were previously mined. Following mining, <br /> spoil piles were graded to approximate original contour and seeded. Due <br /> to poor reclamation, these areas were later covered with suitable <br /> subsoil and reseeded. This map unit occurs on 11.4 percent of the study <br /> area (Table 9-4-3) . <br /> The replaced subsoil and regraded spoil have suitable physical and <br /> chemical properties (Tables 9-4-2 and 9-4-5) . As with Map Unit 6, the <br /> regraded spoil is more acidic, has a higher sulfate concentration, and <br /> is more saline than the replaced subsoil . The replaced subsoil is <br /> typically slightly more alkaline and finer textured than replaced <br /> topsoil . Based upon eight sampled pedons (Table 9-4-4) , about five <br /> inches of suitable subsoil is available for salvage within Map Unit 8. <br /> Map Unit 9 - Subsoiled Disturbed Land, 2 to 15 Percent Slopes <br /> This map unit is associated with the gently to moderately sloping upland <br /> benches. Vegetation consists primarily of cheatgrass and forbs. The <br /> upper horizons (A, B, C 1) of this soil were disturbed or salvaged during <br /> previous mining activity (i .e. topsoil stockpiles , roads, and <br /> ahead-of-mining topsoil salvage) . The initial stand of vegetation was <br /> poor for these areas. Subsequently, in 1983, these areas were covered <br /> with suitable subsoil and reseeded. This map unit occupies about 3.2 <br /> percent of the study area (Table 9-4-3) . <br /> Chemical and physical properties for the replaced subsoil are suitable <br /> (Tables 9-4-2 and 9-4-5) . As noted for Map Unit 0, the subsoil is <br /> typically slightly more alkaline and finer textured than replaced <br /> topsoil . Based upon four profiles (Table 9-4-4) , about eight inches of <br /> suitable subsoil is available for salvage within Map Unit 9. <br /> Map Unit 10 - Topsoiled Disturbed Land, 2 to 15 Percent Slopes <br /> This map unit is associated with the gently to moderately sloping upland <br /> benches or mesas. A diverse reclamation grass stand is usually present. <br /> The upper A, B, and C1 horizons of this soil unit were disturbed or <br /> salvaged during previous mining activity ( i .e. , topsoil stockpiles , <br /> 9-4-25 Revis-d 11/01/P6 <br />