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Former Countryside Market, Stockton,California Feasibility Study and Interim Remedial Action Plan May 20,2013 1.0 INTRODUCTION On behalf of the California Regional Water Quality Control Board (CRW CB) and the Department of General Services (DGS), The Source Group, Inc. (SGI) has prepared thiseasibility Study and Interim Remedial Action Plan (IRAP) for the Former Countryside Market located t 10848 Copperopolis Road, Stockton, California, referred to as Emergency Abandonment and Recalcitrant (EAR) Site No. R10-129 (Site, Figure 1). This document has been prepared subsequent to recent investigation activities that defined the lateral extent of petroleum hydrocarbon impacts in groundwater beneath the Site and surrounding area. The investigation results are detailed in SGI's Site Investigation Report and Site Investigation Work Plan, dated July 16, 2012, and Site Investigation/Fourt Quarter 2012 Groundwater Monitoring and Sampling Report, dated February 8, 2013. Per SGI's February 8, 2013 report, this document is being submitted o: 1) present a preliminary Conceptual Site Model (CSM) based on the available data to identify the xposure pathways and help ensure that the IRAP is protective of human health; 2) evaluate potent al remedial technologies to address the groundwater plume and residually impacted vadose zone soi s beneath the Site; 3) select the most viable remedial approach for meeting the cleanup objectiv s; 4) present a proposed feasibility study for testing the selected cleanup technologies that will also allow for the collection of key bioremediation and geochemical indicator data within the plume; 5) assess the vertical migration of plume constituents that have been detected in downgradient domestic wells; and 6) utilize the IRAP and feasibility testing results along with current groundwater monitoring data to further refine the CSM and formulate a final Remedial Action Plan (RAP) for CRWQCB approval and implementation. 1.1 Report Organization The remainder of this document is organized into the following sections: Section 2.0: Background and Physical Setting This section presents a summary of the Site setting, including a brief description of the local hydrogeologic conditions and previous investigation activities. Section 3 0: Preliminary Conceptual Site Model This section presents an evaluation of the mechanisms through which receptors may be exposed to human health risks from Site-specific chemicals of potential concern (COPCs). Section 4 0: Evaluation of Interim Remedial Technologies This section evaluates various remedial technologies for cleaning up the p troleum hydrocarbon plume, and identifies the most viable technology. Due to the fact that insufficient data is currently available to determine if vadose zone remediation of residually impacted soil beneath the Site is necessary, vapor phase treatment technologies are only briefly evaluated in this section. Tc fill this data gap, a proposed soil and soil gas data collection plan for the former UST area is provided as!part of Section 5.0. Feasibility StWy 8 RAP TW Fnal dm 1-1 he Source Group,Inc.