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• and 9-4-5). Two types of spoil are prevalent. First, the light gray <br />and yellowish-brown sandstone typically has a neutral reaction, moderate <br />salinity, and higher acid base balance. Second, the very dark gray <br />carbonaceous shale has a strongly to slightly acid reaction, moderate <br />salinity, higher iron content, higher carbon content, and lower acid <br />base potential. Coarse fragment contents range from 20 to 45 percent <br />for both types of spoil. <br />No topsoil is available to be salvaged front Map Unit 12. <br />Map Unit 13 - Siltstone Rock Outcrop, 6 to 35 Percent Slopes <br />This map unit typically occurs on moderately sloping to steeply sloping <br />upland knobs. The parent material is primarily soft to slightly hard <br />yellowish-brown to grayish-brown silts tone. The sparse vegetation cover <br />consists of low sagebrush and Indian ricegrass. This map unit. occurs in <br />about 0.9 percent of the study area (Table 9-4-3). <br />Chemical and physical properties for the silts tone rock outcrop unit are <br />suitable. Although no topsoil is available for salvage from this unit, <br />the material is considered to be a suitable root growth medium. This <br />material is part of Lithologic Unit 1 (Tab 6, Addendum 1) which will be <br />utilized as a suitable topdressing material which underlies the replaced <br />topsoil. <br /> <br />5-4-27 Revised 11/01/86 <br />