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CB8d <br /> 180 Promenade Circle, Suite 320 <br /> Sacramento,CA 95834 <br /> Telephone:916-565-4316 <br /> January 13,2015 <br /> Project 149259 <br /> Taj M. Bahadori,P.E. <br /> Senior Civil Engineer <br /> San Joaquin Department of Public Works <br /> Solid Waste Division <br /> 1810 E. Hazelton Avenue <br /> Stockton, CA 95201 <br /> Re: Review of the Stability Analysis at the Foothill Sanitary Landfill <br /> Dear Mr. Bahadori: <br /> This letter is CB&I's response to the Central Valley Regional Water Quality Control Board staff <br /> request for the review of the stability analysis at the Foothill Sanitary Landfill(FSL). <br /> In 2012 CB&I performed a revised global stability and seismic analysis for the FSL. Because the <br /> landfill is a Class III facility, the seismic slope stability analysis was been performed using ground <br /> motions corresponding to the maximum probable earthquake (MPE). Since the time of the 2012 <br /> analysis the faults used in the analysis have not experienced any new seismic activity. An MPE with a <br /> magnitude of 8.1 along the San Andreas Fault located approximately 84 miles from the site was <br /> considered the strongest earthquake for the FSL. <br /> We have also reviewed the previous stability analysis and have concluded that the engineering <br /> analysis used in the assessment are still valid. The portion of the State of California that the FSL is <br /> located is considered one of the more stable portions of the State from a seismic shaking potential. <br /> The global stability analysis took into account the final grades of existing Module I, and future <br /> Modules 1 and 2 as a critical section. <br /> Therefore,we do not believe that an additional stability or seismic study needs to be conducted at this <br /> time. <br /> Please call if you have any questions. <br /> Sincerely, <br /> CB&I Environmental and Infrastructure,Inc. <br /> c� '4A., 'JNUAN C.IENAM d� <br /> N0. FIE <br /> � CENTIFIEI <br /> EN61NEE1IIII <br /> d' NEOLIGIST <br /> an C. Isham,PG, CEG, CHG f'TFOf CI►1�E0�� <br /> Geology Manager <br /> Foothill LF Stability.docx <br />