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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 EXECUTIVE SUMMARY 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 at the Stockton CA ARNG Field Maintenance Shop (FMS) #24 facility in Stockton, California 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 findings of previous investigations by OTIE and others indicate that soil and groundwater beneath former (now removed) diesel and gasoline UST locations at the site have been impacted by the release of petroleum hydrocarbons and related compounds from the former USTs. The findings also suggest that a significant source of petroleum hydrocarbons and related compounds still remains in soil and groundwater in the immediate vicinity of the former USTs, and that dissolved phase petroleum hydrocarbons and related compounds have migrated in groundwater to the approximate site boundaries. The objectives of this treatability study were to: • Evaluate the effectiveness of soil vapor extraction (SVE), air sparging (AS), and high vacuum dual phase extraction (HVDPE) remedial technologies in reducing residual concentrations of petroleum hydrocarbons and related compounds in groundwater and the vadose zone; and • Based on treatability study results, evaluate the feasibility of applying the SVE/AS/HVDPE technology (or some combination of these technologies) to a full-scale site remedial program. To achieve the objectives, OTIE Installed a series of treatability study wells within the primary source area and performed SVE/AS/HVDPE pilot testing between May 7 and 18, 2012. The results of the activities are summarized below: SVE Results: Analyses of field and analytical data from the SVE test confirmed that SVE technology would be successful at recovering mass and treating the vadose zone. The following conclusions are presented for the SVE test conducted at well FMS-SVE1: • The analytical results of influent samples collected at the beginning and end of SVE testing (TPH-g concentration 1,100 ppmv to 750 ppmv over the course of testing) indicate that TPH-g mass is present in the vadose zone and is recoverable via soil vapor extraction. • The ROI for soil vapor extraction at well FMS-SVE1 was calculated to be approximately 60 feet. The relatively large SVE ROI indicates that significant quantities of soil vapor can be effectively extracted from the contaminated area of the vadose zone with relatively few wells. OTIE