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i Dr. Hari Shaama, P.E., G.E. 22 January 2441 Page 4 landfill site. The PHGA estimates were obtained using the Abrahamson and Silva [1997} attenuation model. The Da estirnatcs were obtained using the Abrahamson and Silva [ 19961 duration model. Table 1 indicates that the My 6.4 NffE event on the Great . Valley blind thrust system: at a distance of 21mi. (34 km) induces the highest bedrock MPE PIHGA at the site. Table 1 father indicates that the Mw, �6.71ViCE event on rile Great Valley bland thrust system at s distance of 21mi (34 )m} induces the.hu wst bedrock MCE PHGA at the site. Table 1 also indicates that the WE and MCE on the San Andreas fault s. are characterized by the same Mw 7.9 event at a distance of 70 mi (112 km). This large - magnitude distant event induces the longest duration of strong ground shaldng at The site. Given a relatively small difference in the estimated bedrock PHGA and the relatively large difference in estimates DB, the -M,, 7.9 event on'Che °`Sazt`Andreas` s may be. the most g quake for the F Site: Therefore; the w 7.9 event on the San Andreaf fault system should be consideredal 'o of both E and MCE design groundotic at the Forward Landfill sito along with the appropriate Mw, event on the Great Valley blind 11=t system. Evaluation of Design Ground Motions Acceleration time hismiies (aecelerograrns) representative of both candidate NTE and MCE events (M� 6.4,MPE or M. 6.7 MCE event. at the Great Valley fault system and MPF.�lMCE Mw 7.9 at the San Andreas fault rystein) are required for use in seismic response and deformation analyses at the Forward Landfill site. GcOSyntec selected a suite of four design time histories on the basis of the following methodology: (i) stxe= the database of acceleration time histories on the basis of earthquake magnitude and predominant style of faulting and develop .a reduced database of time histories that were recorded in events similar to those of the WE; (ii) screen the reduced set of acceleration time histories based on the target duration of strong ground shaking; and (Iii) plot the acceleration response spectra of selected accelerograms against target acceleration response spectra and select a suite of time p. jpgTI1G4WYPWMICAUF-WCIFORWARDWM XAZDOC t'd 902L -T09 -01S 2uz..iaauz2u3 simal WUSE:6 TOOZ ST Rew rT,�n -V'-I c'01"T�ncCIH nTnmmn 7r/QP PCQC ra'7T TQQ7/Tf=/)P