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11 <br />GEoSYNTEC CONSMTANas <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 84th percentile response spectra <br />for the design event. <br />GeoSyntec developed median and 84'h percentile acceleration response <br />spectra for both the MW 6.4 MPE and Mw 6.7 MCE events on the Great Valley blind <br />thrust system and the MPE/MCE Mw 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 />MCEevent on the Great Valley blind thrust system, in Figure 3 for the Mw 6.4 WE <br />event on the Great Valley blind thrust system, and in Figure 4 for the Mw 7.9 MPENCE <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 />M,r 6.9 Loma Prieta earthquake; <br />the 360 -degree component of the Corralitos-Eureka Canyon Road <br />record from the Mw 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 Mw 6.9 Loma Prieta earthquakee seleblincted <br />to <br />represent the Mw 6.4 MPE and M,a 6.7 MCE events on the GreatValley <br />st <br />system. To compensate for a slight duration deficiency in both the MPE and MCE and <br />p. tpRJ2tCAWpWM CA UF-WC%FORWARDiFOR-HAZ.DOC <br />ft JA <br />