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® 2 100 Main Stlect,Suite 1.50 <br /> womb, Huntington Beach,California 92648-USA <br /> N906, GEOSYNTEC CONSULTANTS Tcl. (714)969-0800-Fax(714)%9-0820 <br /> 0- 22 January 2001 <br /> Dr. Hari Sharma, P.E., G.E. <br /> Principal <br /> GeoSyntec Consultants <br /> 1500 Newell Avenue, Suite 800 <br /> Walnut Creek, California 94596 <br /> Subject: Seismic Site Exposure Evaluation and <br /> Selection of Design Ground Motions <br /> Forward Landfill, San Joaquin County, California <br /> Dear Dr. Sharma: <br /> INTRODUCTION <br /> This letter report presents the seismic site exposure evaluation for the Forward <br /> Landfill in San Joaquin County, California, by the GeoSyntec Consultants (GeoSyntec) <br /> Huntington Beach office. This seismic site exposure evaluation consists of evaluation <br /> of the seismic hazard for the site and development of corresponding design ground <br /> motions. The results of the seismic site exposure evaluation indicate that the Maximum <br /> Probable Earthquake (WE) at the site is either a Moment Magnitude (M,) 6.4 event on <br /> the Great Valley blind thrust system approximately 21 miles (34 km) southwest of the <br /> site or a M,,,,7.9 event on the San Andreas fault system which is approximately 70 miles <br /> (1 12 km) southwest of the site. The results of the seismic site exposure evaluation <br /> further indicate that the Maximum Credible Earthquake (MCE) at the site is either a <br /> Moment Magnitude (M,,,) 6.7 event on the Great Valley blind thrust system or a M,7.9 <br /> event on the San Andreas fault system. <br /> GeoSyntec characterized both the MPE and MCE for the site with two sets <br /> of representative ground motion parameters. Each set consists of the peak horizontal <br /> ground acceleration in a hypothetical bedrock outcrop at the geometric center of the site <br /> (PHGA), a target acceleration response spectra, and a target duration of strong ground <br /> shaking for candidate WE (MCE) events considered. The expected median free-field <br /> P-tP1111CA WPWA4 C.4LIF-WOFOR WARDIFOXHAZ DOC <br />