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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 • Section 6 provides conclusions related to the combined SVE, AS, and HVDPE treatability study, and presents a general statement of conclusions related to feasibility of these technologies for remediating petroleum hydrocarbons at the site; • Section 7 presents a feasibility evaluation of remedial options related to the technologies evaluated during the treatability study, and makes recommendations for a feasible approach to site remediation; and • Section 8 lists references cited in the preparation of this Report Figures and tables referenced in the text are presented following the References section. Graphs of data related to water levels over time and estimated radius of influence (ROI) associated with the treatability study are presented subsequent to the figures and tables. Finally, all project -related field documentation including boring logs/well construction diagrams, treatability study test summary data, mass removal calculations, laboratory analytical reports and related chain -of -custody (COC) documentation, aquifer analysis, and waste disposal manifests are presented as individual appendices to the report. 1.1. PROJECT OBJECTIVES AND SCOPE 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 the combined treatability study were to: • Evaluate the effectiveness of SVE, AS, and HVDPE remedial technologies in reducing residual concentrations of petroleum hydrocarbons and related compounds in groundwater and the vadose zone in the immediate vicinity of the former UST locations; and • Based on treatability study results, evaluate the effectiveness, implementability, and cost of applying the SVE/AS/HVDPE technology (or some combination of these technologies) to a full-scale site remedial program. To achieve the stated project objectives, the following scope of work was implemented: • Installing a series of treatability study wells within the primary source area, as follows: o Between May 7 and May 8, 2012 two HVDPE wells, screened across the impacted vadose and saturated zones, one of which may become part of the groundwater gauging and sampling program upon completion of the treatability study; o On May 9, 2012 nested AS wells (2); the first screened across the upper portion of the water -bearing zone and the second screened across a deeper saturated zone impacted with constituents of concern; and o On May 10, 2012 a shallow SVE well, screened within the vadose zone. OTI E