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<br /> -2z- <br /> <br /> soft areas should be limited until a base can be built up. <br />' In areas that become unstable, a croarse rock could be used to <br /> build up a working platform. This will probably also be <br />' uired for fills extendin <br />into the river d~annel <br />re <br /> g <br />. <br />q <br />' 3. In sloping areas steei~r than 5: 1, the ground surface should <br /> be benched to provide a level surface for fill placement. <br />' 4. The exposed surface should be scarified, moistened and <br /> compacted or proofrolled with a large rubber-tired vehicle. <br />' S. Required fill should be placed in horizontal lifts compacted <br /> to at least 1008 of standard Proctor density (AS`II~1 D-698) at <br /> ist <br />t <br />ti <br />t <br />O <br />- <br />it <br />l <br />il <br /> a rtu <br />ure con <br />near op <br />mum. <br />en <br />n <br />s <br />e granu <br />ar so <br />s <br />' typically encountered at the test holes should be used as <br /> fill material. Any oversized rock should be reproved prior to <br /> compaction. Erd dumping should not be allowed unless <br /> approved by the design engineer. <br />' 6. The new channel slope should be heavily arrtpred to prevent <br /> erosion from surface runoff and undercutting by the river. <br /> <br /> 7. Sufficient depth of ballast should be provided immediately <br />' tr_low the tie and rail system to distribute loading. <br />' GROUDID FLOORS <br />'R~e on-site soils other *_':ian topsoil and uncorkacted fill mater- <br />' ials are capable of supporting light to moderately loaded slab-on- <br />grade construction. Slabs placed on the sandy to silty soils and <br />gravelly soils encountered along the river will have a relatively low <br />' risk of differential rtnvem=_nt provided the subgrade and subsequent <br /> <br /> <br />