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material. Results of these tests were compared with the Standard <br />Proctor density curvees made from laboratory tests of the fill material <br />taken from the pit excavation. Comparision of the moisture content of <br />the fill material with the optimum moisture content of the Proctor <br />density curve ensured that proper compaction of the fill material <br />was attained. In addition, density tests of the samples in the field <br />also indicated that greater than 95% compaction was consistantly <br />being maintained during construction of the embankments. <br />Construction Methods <br />Fill material was loaded at the existing pit, hauled to the <br />embankment locations and placed in 6" to 8" lifts by Caterpillar <br />657-8 Scrapers. After placement of each lift, a 815-C or 825-C <br />Compactor was used to grade and compact each lift. Each lift was <br />also watered to increase the moisture content as required to increase <br />the compaction of the fill material. A motor grader was also •used <br />to maintain the proper slopes on the embankments. <br />Fill material consisted of sandy shale and shale material selected <br />within the overburden of the existing pit. Particular care was <br />exercised to ensure that material greater than 6 inches in size was not <br />used in the embankment. A homogenous mix of the shale and sandy shale <br />material was maintained through each constructed embankment. <br />6 <br />r~ ~ ~ 1lIC. <br />