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GEOSYNTEC CONSULTANTS <br /> Dr. Hari Sharma, P.E., G.E. <br /> 22 January 2001 <br /> Page 5 <br /> histories that fill the envelope between the median and 84`h percentile response spectra <br /> for the design event. <br /> GeoSyntec developed median and 84`h percentile acceleration response <br /> spectra for both the M, 6.4 MPE and M,v 6.7 MCE events on the Great Valley blind <br /> thrust system and the MPE/MCE M, 7.9 event on the San Andreas fault system using <br /> the Abrahamson and Silva [1997] attenuation model. These acceleration response <br /> spectra, referred to herein as the "target spectra," are shown in Figure 2 for the Mw 6.7 <br /> MCE event on the Great Valley blind thrust system, in Figure 3 for the M,,,6.4 MPE <br /> event on the Great Valley blind thrust system, and in Figure 4 for the M,r 7.9 MPE/MCE <br /> event on the San Andreas fault system. <br /> Based on the above outlined screening criteria, GeoSyntec selected the <br /> following four accelerograms for design considerations at the Forward Landfill site: <br /> • the 270-degree component of the Saratoga-Aloha Avenue record <br /> from the MW 6.9 Loma Prieta earthquake; <br /> • the 315-degree component of the Santa Teresa Hills record from the <br /> Mw, 6.9 Loma Prieta earthquake; <br /> • the 360-degree component of the Corralitos-Eureka Canyon Road <br /> record from the M,v 6.9 Loma Prieta earthquake; and <br /> • the Magnitude 8+ synthetic accelerogram generated by Seed and <br /> Idriss [1969] to simulate a distant large-magnitude event on the San <br /> Andreas fault. <br /> The Saratoga-Aloha Avenue, Santa Teresa Hills, and Corralitos-Eureka <br /> Canyon Road records from the M,,,6.9 Loma Prieta earthquake were selected to <br /> represent the Mme, 6.4 MPE and MH, 6.7 MCE events on the Great Valley blind thrust <br /> system. To compensate for a slight duration deficiency in both the MPE and MCE and <br /> P.IPRl2iCA WPWM1 CALIF-WCIFORWARDIFOR-HAZ.DOC <br />