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John Moody <br /> July 13, 2009 <br /> Page 3 <br /> Based on the known faults in the area, the estimated peak ground acceleration for the <br /> site is low. Values of peak acceleration are 0.1g and 0.09g for the CRCV and San <br /> Andreas Fault systems, respectively. As a check, DWR staff performed some <br /> simplified probabilistic analyses for the site using the USGS website. <br /> DWR staff recommends that some,simplified deformation analyses be performed for <br /> the landfill using the Makdisi Seed method (1977) or Computer Program Displace. <br /> DWR staff feels that Dr. Abrahamson's findings are accurate given the known faults <br /> and MPE loading assumed. DWR staff, however, recommends that consideration be <br /> given to increasing the design earthquake loading to 0.158. DWR feels this increase is <br /> warranted given the height of the embankment, the results of the simplified USGS <br /> analyses performed by DWR, and the possibility,that a small earthquake, such as a M <br /> 6.5 or 6, can occur almost anywhere in California. The Makdisi Seed method evaluates <br /> deformation for Magnitude 6.5, 7.5, large 8.5 (richter) magnitude earthquake events. If <br /> the Makdisi-Seed method is performed, the lower bound fault range should be <br /> assumed, <br /> Concluding Comments <br /> I hope that the review comments were helpful. Please contact me and/or have <br /> representatives of Shaw Environmental, Inc. contact me regarding this review at <br /> (916) 657-5143 or (916) 698-8724. <br /> Sincerely, <br /> 14 <br /> Mike Driller <br /> Senior Engineer <br /> Civil Engineering Branch <br /> Division of Engineering <br /> cc: Joe Royer <br />