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2100 Main Stmt, Suite 150 <br />(� � Huntington Beach, California 96648 <br />V <br />e� EOSYNTEC CONSULTANTS Tcl. (7 14) 969-0800 • Fax (714) 969-0820 <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 />22 January 2001 <br />This letter report presents the seismic site exposure evaluation for the Forward <br />0 -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 (NTE) at the site is either a Moment Magnitude (M,r) 6.4 event on <br />the Great Valley blind thrust system approximately 21 miles (34 km) southwest of the <br />site or a M,v 7.9 event on the San Andreas fault system which is approximately 70 miles <br />(1 l2 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 (Mw.) 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 MICE 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 MPE (MCE) events considered. The expected median free -field <br />P: tPRJliCAWPWA41CALIF-WC-tFONw,4RDIFOR-HAZDOC <br />•a'YI Zla ♦Mp atRfi4�l1 <br />