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LABORATORY TESTING <br />Two bulk grab samples of the fill material were collected from the <br />excavation area within the active pit. These two samples constituted <br />the extreme ranges of material to be used as fill material in the <br />embankments. Sample 1 consisted of a medium to fine grained dirty <br />sandstone which was poorly cemented and broke quite easily. Sample 2 <br />was a dark gray shale. AST~4 Designation D 698-70 and Standard AASHO <br />methods were utilized to determine the standard Proctor density. <br />Figures 1 and 2 show the relationship of moisture to dry density for <br />the sandstone and shale materials. Since these two materials represent <br />the extremes of the material used as fill in Embankments A, B, C, D <br />and E the lower density material was used as the minimum requirement <br />for the embankments. <br />Optimum moisture content was determined to be 18% for the sandstone <br />material and 16.5Y for the shale material. This range of moisture <br />content and the corresponding densities required for 95q compaction <br />as illustrated in Figure 1 and 2 were utilized in reviewing the actual <br />densities attained in the embankments. <br />9 <br />A ~ $ >NC. <br />