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GEOSYNrEc CONSULTANTS <br /> Dr. Hari Sharma, P.E., G.E. <br /> 22 January 2001 <br /> Page 2 <br /> bedrock PHGA for the Mu, 6.4 MPE event on the Great Valley blind thrust system <br /> equals 0.09 g. The expected median free-field bedrock PHGA for the MW 6.7 MCE <br /> event on the Great Valley blind thrust system equals 0.13 g. The expected median free- <br /> field bedrock PHGA for the M,,, 7.9 MPE (and the MCE) events on the San Andreas <br /> fault system equals 0.06 g. <br /> To characterize the MPE and MCE in the time domain, GeoSyntec selected a <br /> suite of four accelerograms compatible with the above cited ground motion parameters. <br /> These accelerograms may be used in seismic response analyses performed for landfill <br /> design at the Forward Landfill site. <br /> SEISMIC EXPOSURE EVALUATION <br /> Background <br /> The Forward Landfill is located at 9999 South Austin Road in San Joaquin <br /> County, California, approximately 7 miles (ll ]an) southeast of Stockton. The site <br /> location with respect to the major roads in the area is shown in Figure 1. Approximate <br /> site coordinates are 37.877 degrees north latitude and -121.183 degrees west longitude. <br /> The 157-acre (63.5 ha) landfill site encompasses several Waste Management <br /> Units (WMUs), including an 8-acre (3.2 ha ) California Class I hazardous waste WMU. <br /> The Class I unit, known as WMU A, was closed in 1989 and is currently in post-closure <br /> monitoring. At present, only designated and non-hazardous wastes are treated and/or <br /> disposed of at the Forward Landfill in either California Class H or Class III WMUs. <br /> Seismic Hazard Evaluation <br /> GeoSyntec evaluated the seismic hazard for the Forward Landfill site on the <br /> basis of information provided in recent relevant studies of known active and potentially <br /> P IPRIpCAWPWMICALIF-WCIFORWAPDTOR-/HAZDOC <br />