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-26- <br />' 1. The existing ground surf:.ice should be cleared of all vegeta- <br /> tion, topsoil and any loose soil or uncompacted fill. In <br />' - sloping areas steeper than 5:1 (horizontal to vertical) the <br /> ground surface should be benched to provided a level surface <br />' <br /> for fill placement. <br />' 2. In cut areas, the exposed subgrade should be scarified <br /> 6 inches, moistened to near optimum and compacted. Required <br /> fill should then be placed in horizontal lifts and compacted. <br /> Degree of compaction and fill material type will depend pri- <br />' floors and <br />maril <br />on the intended <br />ad use <br />Beneath buildin <br /> p <br />g <br />y <br />. <br />' pavement areas, we recommerd a minimum compaction of 958 of <br /> standard Proctor density (ASTM D-698). On-site clays free of <br /> vegetation, debris and oversized rods can be used beneath <br /> pavement and miscellaneous fill areas. Non-expansive mster- <br />' ials similar to granular soils encountered in the lower area <br /> of the site along the river should be used beneath building <br /> areas <br /> . <br />' 3. Pads constructed for future building sites should be graded <br /> with adequate slope to prevent ponding. <br />COI~ACTION AMID SBRINRAGE FACTORS <br />Subgrade soils in the lower area adjacent to the river are gener- <br />' ally loose to medium dense, whereas the clays in the higher plateau <br />area are stiff to very stiff. elevation loss due to scarifying and <br />' compacting the subgrade soils is estimated to be on the order of 1 to <br />2 inches. This loss will be generally negligible compared to the 1 to <br /> <br />1 <br />