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LEROY CRANDALL <br />AND ASSOCIATES <br />APPENDIX <br />EXPLORATIONS <br />The site was explored by drilling 18 borings to depths ranging from <br />5 to 50 feet below the existing ground surface. Borings 1, 4, 6, and 9 were <br />drilled using 5-inch-diameter rotary wash-type drilling equipment with drill- <br />ing mud to prevent caving. Boring 12 was drilled to a depth bf 151r feet using <br />24-inch-diameter bucket-type drilling equipment, and then extended to 50 feet <br />using the rotary wash-type equipment. The remaining borings were drilled with <br />24-inch-diameter bucket-type equipment. Caving of the boring walls occurred <br />in one of the bucket holes during drilling; easing or drilling mud was not <br />used to extend the bucket borings to the depths drilled. <br />The soils encountered were logged by our field engineer, and undis- <br />turbed samples were obtained for laboratory inspection and testing.Loose <br />samples were also obtained for the performance of laboratory compaction and <br />California Bearing Ratio tests and for expahsion index tests. The logs of <br />the borings are presented on Plates A-1 through A-22; the depths at which <br />undisturbed samples were obtained are indicated to the left of the boring <br />logs. The soils are classified in accordance with the Unified Soil Classifi- <br />cation System described on Plate B. <br />LABORATORY TESTS <br />The field moisture content arid dry density of the soils encountered <br />were determined by performing tests on the undisturbed samples. The results <br />of the- tests are shown to the left of the boring logs. <br />Direct shear tests were performed on selected undisturbed samples to <br />determine the strength of the soils. The* samples were tested at field and <br />increased moisture contents and at various surcharge pressures. Many of <br />the samples were tested at two different surcharge pressures to provide more