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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 from 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 siltstone. 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 siltstone 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 /> 9-4-27 Revised 11/01/86 <br />