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Geo-Loqk <br /> ASSOCIATES <br /> • Geologists,Hydrogeologists and Engineers <br /> January 25, 2013 <br /> JN 2011-0115 <br /> San Joaquin County Department of Public Works <br /> 1810 E. Hazelton Avenue <br /> Stockton,California 95205 <br /> Attention: Mr.W. Michael Carroll <br /> SUBMITTAL OF ENGINEERING FEASIBILITY STUDY FOR <br /> CORRECTIVE ACTION ALTERNATIVES EVALUATION <br /> CORRAL HOLLOW SANITARY LANDFILL,SAN JOAQUIN COUNTY,CALIFORNIA <br /> Geo-Logic Associates is pleased to provide the San Joaquin County Department of Public Works <br /> (County) with the attached Engineering Feasibility Study for Corrective Action Alternatives <br /> Evaluation (EFS)for the Corral Hollow Sanitary Landfill (CHSL). This document fulfills a reporting <br /> requirement outlined in an Order to the County from the Central Valley Regional Water Quality <br /> Control Board (RWQCB)staff dated July 7,2011. <br /> As described in this EFS, GLA evaluated 16 potential remedial alternatives for the site. Of these, <br /> six were considered viable technologies to remove volatile organic compounds (VOCs) from <br /> • groundwater in the shallow aquifer beneath the site. The six viable alternatives were further <br /> evaluated with respect to technical effectiveness, constructability, service requirements, and <br /> capital and long-term operations and maintenance costs. The evaluation results suggest that <br /> control of VOC sources by extending the final cover system over wastes outside the previous <br /> closure limits and expansion of the landfill gas extraction system were the best corrective action <br /> alternatives for the site. The evaluation results also suggest that natural attenuation of VOCs <br /> would be an effective means of reducing VOCs beyond the point of compliance. The EFS also <br /> presents a corrective action decision chart for additional corrective actions based on the results <br /> of future monitoring events. <br /> GLA appreciates the opportunity to provide our services to the County. If you have any <br /> questions regarding this letter, please call us at(858)451-1136 at your convenience. <br /> Geo-Logic Associates <br /> ohn M. Hower,CEG /SaraAhJ. Battell/,CH/G' <br /> Supervising Geologist Vice President <br /> CC: Steve Sarantopoulos,GLA-Grass Valley <br /> • <br /> 11415 W. Bernardo Court, Suite 200, San Diego, California 92127 Phone: (858)451-1136 FAX: (858)451-1087 <br />