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ENGINEERING FEASIBILITY STUDY FOR CORRECTIVE ACTION CORRAL HOLLOW SANITARY LANDFILL SAN JOAQUIN COUNTY,CALIFORNIA EXECUTIVE SUMMARY This Engineering Feasibility Study (EFS) for Corrective Action was completed to help determine an appropriate response to impacted groundwater conditions that have been identified at the Corral Hollow Sanitary Landfill (CHSL). This study was prepared In accordance with California Code of Regulations Title 27, Section 20420, and a letter submitted by the Central Valley Regional Water Quality Control Board dated July 7, 2011 This EFS specifically recommends a proposed Corrective Action Program (CAP) to address volatile organic compound (VOC) impacts to groundwater in the identified release area. The EFS includes a summary of site conditions, identification of available remedial alternatives, preliminary screening to identify viable alternatives, definition of treatment system components and costs, and a technical/cost evaluation to identify the merits and limitations of the remedial alternatives. The EFS considers potential remedial alternatives, including source controls, and in-situ and ex-situ remedial technologies to address groundwater impacts. A total of six technologies ® were identified as being potentially viable at the site. Technically viable treatment technologies include: • Source control through extension of the final cover system; • Source control through expansion of the landfill gas extraction system; • Injected air sparging combined with vapor extraction; • Intrinsic remediation; • Groundwater extraction and treatment by air stripping; and • Groundwater extraction and treatment by granular activated carbon adsorption. After defining the system components and costs, the EFS evaluated the merits and limitations of each technology. Capital costs for the six remedial technologies ranged from about$9,500 to$1,386,000. Based on the technical/cost evaluation and findings from the recent Evaluation Monitoring Program (EMP) field investigation (GLA, 2012), it is concluded that enhancement of the landfill gas collection system, combined with an extension of the final cover system over 1.3 acres of more recently-identified wastes that lie to the north of the closed landfill would be the most appropriate initial remedial action to mitigate the release. The existing landfill gas extraction system is highly effective at removing VOCs from the existing waste prism,though no wells have been constructed in the 1.3-acre waste area.