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2100 M3�1 sty sn'= 150 <br />a,tison 8e a h; cati6rais 926" • USA <br />Tel. (714) %9-0100 • Fax (7 14) 469-0820 <br />k <br />`JLU%.F ;,/ A 6 s w — — <br />22 January 2001 <br />Dr. Hari Sbarma, F.E., G.E. <br />Principal <br />GeoSyntec Consultants <br />1500 I4ewell Avenue, Suite 800 <br />Walnut Creek, California 94596 <br />Subject: Seismic Site Exposure Evaliiali0h and <br />Selection of Design Ground Motions California <br />Forward .Landfill, San Joaquin <br />County, <br />}ear Dr. Sbwma: <br />ODUCTION <br />r report e seismic site <br />®e evaluation <br />GeOSYMIIIICConsultants "( This lettCalifornia, by e S <br />tee) <br />Landfill in San Joaquin Co tY, evaluation cohsistsof evai <br />Ijuntington Beach office- This se'c site exposure <br />design mound <br />of the seismic hazard for the site and develo m nt <br />��ofl of ��� � �e Ma.Yimun� . <br />motions. The results of the seismic site expo rode 6.4 .event on <br />probable Earthquake (hdFE) at the site is either a Moment M (Mw). <br />xiu)ately 21 miles (34 I=) southwest of the <br />the Great Valley blind throst syr �o eta � � appm�cimately 70 miles <br />site or a M,. 7.9 event on the San Andreas fault syst <br />l l�} southwest of the site. 'The results of the seismic site exposure' evaluation <br />( ,CE Au the .site is either a <br />farther indicate tbat the Maximuca Credible Earthquake lM 3 m or, a iv w 7.9 <br />Moment Magnitude (M) „ 6.7 event on the Grey Valley blind thrust <br />event on the San Andreas fault srtqn' <br />C�eoSyntec characterized both the MPE and MCE for the- site with two sets <br />motion pa Each set consists of the peak herizoIItal <br />Of representative ground at the geometric censer of the site <br />ground acceleration in s hypothetical bedrock vu�F � duration of strong ground <br />a t acceleration response spectra, and a tang <br />(PHGA), targe expected median free -field <br />shaking for candidate MPE (MCEi evrnts considered. 'fhc <br />\. P.-IP)U2 tCAWpWMICVJF-RrC%FORWAp.Mf*R-SOC <br />z'd 2utJa6uz2u3 szmel WU20=01 1002 S1 ReW <br />CT/7P -4Ptia qq I CT inggw nTnf'1ingn 7(= I A RP9A9 ! A :7.T TAA7. fTr I1 A <br />