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TECHNICAL MEMORANDUM <br /> Page 5 3 <br /> June 3, 1992 <br /> SAC31583.AC.ZZ <br /> boring logs reflect these ASTM standards. Pocket penetrometer tests were conducted on <br /> most cohesive samples. Samples were then prepared for storage by placing representative <br /> portions in plastic bags or by sealing the sampling tube with plastic cap.and tape. Sample <br /> descriptions, blow counts recorded during the SPT, and other relevant information were <br /> recorded on the soil boring logs. These logs are presented in Appendix I. <br /> Laboratory Testing <br /> Laboratory tests to determine pertinent index and engineering properties on selected soil <br /> samples were performed by Harding Lawson Associates of Concord, California. Laboratory_ <br /> test results are presented in Appendix II. <br /> Index tests included determining the amount of material in the soil sample finer than the <br /> number 200 sieve, and determining the liquid limit, plastic limit, and moisture content of <br /> selected samples. The results of these tests are listed in Table 11-1, in Appendix II. <br /> Engineering property tests included unconsolidated-undrained (UU) triaxial compression <br /> tests and consolidation tests. Results of these tests are also summarized in Table II-1. <br /> Interpretation <br /> Geology <br /> Based on a review of the geology section of the Comprehensive Landfill Description (CH2M <br /> HILL, 1992), sediments at the site consist of marine clays, silts, and sands that are <br /> approximately 5,250 feet thick under the site. For additional discussion on geology, refer to <br /> the Geology subsection of the Comprehensive Landfill Description. <br /> Seismicity <br /> Based on a review of the Comprehensive Landfill Description for Forward Landfill, there <br /> are no major faults that transect the landfill area. Based on a seismicity study performed by <br /> Kleinfelder (October 1987), the Comprehensive Landfill Description also reports a maximum <br /> peak bedrock acceleration of 0.188 at the site. This peak bedrock acceleration corresponds <br /> to a Richter Magnitude 7 Maximum Credible Earthquake along the Midland fault, which is <br /> located approximately 24 miles from the site. Refer to the Comprehensive Landfill <br /> Description report (CH2M HILL, 1992) for additional discussion of the area faults and the <br /> A <br />