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• 86. Penetration resistance values, when properly evaluated, indicate the relative density or consistency of <br />the soils. Several large disturbed samples of the existing fill materials were also obtained as the test pits <br />were excavated. The depths at which the samples were taken and the penetration resistance values are <br />shown on the logs of the exploratory test holes and pits in Figures #3 and #4, respectively. The Legend <br />and Notes associated with the logs are shown in Figures # 5 and 6, respectively. <br />Laboratory Investigation <br />Samples obtained from the exploratory tF;st holes were examined and classified in the laboratory by the <br />project manager for NWCC. Laboratory testing included standazd property tests, such as natural moisture <br />contents, dry unit weights, grain size analyses and liquid and plastic limits. Unconfined-compressive <br />strength tests were also conducted on samples to evaluate the sheaz strength values of the overburden soils, <br />fill materials and bedrock materials. A standard Proctor test was also conducted on a sample of the <br />existing fill materials so that the maximum remolded dry density and optimum moisture content could be <br />determined for the existing fill materials. <br />The standard Proctor test results are shown in Figure #7 and all of the other laboratory test results are <br />summarized in the attached Table 1. The laboratory testing was conducted in general accordance with <br />applicable ASTM and AASHTO specifications. <br />Subsurface Conditions <br />The subsurface conditions encountered in the test holes and test pits advanced across the slide area were <br />variable and generally consisted of a layer of man-made fill materials overlying natural clays and/or <br />weathered claystone materials that were underlain by claystone-shale bedrock, which extended to the <br />maximum depth investigated in each of the test holes. Graphic logs of the test holes are shown in Figure <br />#3 and the graphic logs of the test pits aze shown in Figure #4. The Legend and Notes associated with the <br />test hole logs are presented in Figures #5 and #6, respectively. More detailed descriptions of the <br />subsurface conditions encountered at the site are provided below. <br />A layer of man-made fill materials was encountered at the ground surface in all of the test holes and pits <br />advanced at this site. The depth and consistency of the fill materials was highly variable. The fill materials <br />were encountered to depths ranging from. 131/z to 24 feet beneath the existing ground surface. The fill <br />materials were highly variable in consistency and primarily consisted of clays that were slightly sandy to <br />sandy with bedrock fragments ranging from gravel to boulder in size, low to highly plastic, soft to stiff, <br />Job Number: 07-7600 NWCC, Inc. Page 4 <br />