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Treatability Study Report and Feasibility Evaluation for In Situ Petroleum Hydrocarbon Remediation Field Maintenance Shop #24, 8020 South Airport Way Stockton. California 1.0 INTRODUCTION On behalf of the California Army National Guard (CA ARNG), Oneida Total Integrated Enterprises (OTIE) has prepared this Treatability Study Report and Feasibility Evaluation for In Situ Petroleum Hydrocarbon Remediation, and hereby submits it to the Central Valley Regional Water Quality Control Board (CVRWQCB), under Contract W91238 -09-D-0017, Delivery Order 0008 with the United States Army Corps of Engineers (USACE) Sacramento District. This report was prepared to document the findings associated with implementation of a treatability study pursuant to the Work Plan for Implementing an Air Sparge, Soil Vapor Extraction, and Dual -Phase Extraction Treatability Study for In Situ Petroleum Hydrocarbon Remediation (Work Plan; OTIE, 2011c). The CVRWQCB concurred with the Work Plan in a letter dated 23 March, 2012. The approach to the treatability study presented in the Work Plan was based on findings from historical soil and groundwater investigations performed by OTIE and others at the CA ARNG Field Maintenance Shop (FMS) #24, located at 8010 South Airport Way in Stockton, California (hereinafter referred to as the site). Those findings have been documented in the following reports: • Preliminary Assessment/Site Investigation Update Report, California Army National Guard Facility (Versar, Inc., 2004); • Site Investigation Report, Underground Storage Tank (USTO Location at the Field Maintenance Shop # 24, California Army National Guard, Stockton, California (URS Corporation, 2007); and • Final Groundwater Monitoring Well Installation and First Quarter 2010 Groundwater Monitoring Report (OTIE, 2010a). Additionally, OTIE performed quarterly groundwater gauging, monitoring, and reporting pursuant to the CA ARNG's voluntary monitoring program for the Second Quarter 2010 (OTIE, 2010b), Third Quarter 2010 (OTIE, 2011a), and First Quarter 2011 (OTIE, 2011b). This Treatability Study is presented as follows: • The remainder of Section 1 presents project objectives and scope, a brief description of the site setting and history, and a description of the technology associated with the combined soil vapor extraction (SVE), air sparge (AS), and high vacuum dual phase extraction (HVDPE) treatability study; • Section 2 provides a description of activities related to the initiation and implementation of the treatability study; • Section 3 provides detailed procedures for implementation of the SVE test, and summarizes the treatability study results; • Section 4 provides detailed procedures for implementation of the AS test, and summarizes the treatability study results; • Section 5 provides detailed procedures for implementation of the HVDPE test, and summarizes the treatability study results;