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6 <br /> �r <br /> 8820011ST1 CON VVo`odward-Clyde Consultants <br /> diameter, hollow-stem, continuous flight augers. A WCC geologist observed <br /> ` the drilling operations and prepared a field log of each soil boring. <br /> These boring logs are presented in Appendix A. <br /> The four soil borings were each drilled to 45 feet below surface grade. <br /> Groundwater was not encountered in any of the borings while drilling. <br /> Therefore, bentonite pellets were added to the bottom of the boreholes, <br /> which were then backfilled with cuttings and sealed to surface grade with <br /> cement by Gettler-Ryan Inc. <br /> 4.2 Soil Sampling <br /> Soil samples were collected at five-foot intervals by advancing a modified <br /> California sampler through the hollow stem of the augers. The sampler was <br /> driven a maximum of 18 inches, using a 140-pound hammer with a 30-inch <br /> drop. The number of blows required to drive the sampler are shown on the <br /> boring logs. <br /> The soil samples were retained in four, four-inch long, two-inch diameter <br /> brass liners within the sampler. The brass liners were labeled A through D <br /> from bottom to top. The soil sample in brass liner A was retained for <br /> I'4 chemical analysis by covering both ends of the liner with teflon sheeting, <br /> and sealing with plastic end caps and electrical tape. The sample was then <br /> labeled and stored in a chilled ice chest. Selected samples were later <br /> transported on ice to the laboratory using WCC Chain-of-Custody <br /> documentation. <br /> Soil samples in brass liners B, C, and D were described by a WCC geologist <br /> k: using the Unified Soil Classification System. The descriptions are shown <br /> on the boring logs presented in Appendix A. <br /> i <br /> a <br /> 5 <br />