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TECHNICAL MEMORANDUM <br />Page 5 <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 omseleetted=soil <br />samples were performed by Harding Lawson Associates of Concord, California. Laboratory_ <br />test results are presented in Appendix II. <br />Indextests included determining the amount of material in the soil sample,,bnser-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 II -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 suminarized 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, .aud. 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 0.18g 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 />