ARCHIVED REPORTS_MONITORING WELL INSTALLATION AND BIOSPARGE EVALUATION REPORT

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i 1.0 INTRODUCTION AND SITE BACKGROUND On behalf of Sara Lee Bakery Group, Inc., PSC Industrial Outsourcing, LP (PSC) has prepared this Monitoring Well Installation and BioSparge Evaluation Report (Report) for the former Colombo/Toscana Bakery (Colombo/Toscana) site located at 1444 South Lincoln Street in Stockton, California (Site). PSC selected BioSparge as the most effective remedial alternative for the Site in the Feasibility Study/Remedial Evaluation (FSIRE) submitted on November 30, 2008. This report has been prepared in accordance with PSC's Biosparge Detailed Evaluation and Monitoring Well Installation Plan submitted April 6, 2009. The ' Central Valley Regional Water Quality Control Board (CVRWQCB) approved the work plan in a letter dated April 29, 2009. A copy of the agency correspondence is provided in Appendix A. CVRWQCB originally requested a pilot test for the application of the biosparge technology at the Site in a letter dated December 23, 2008. PSC proposed a detailed evaluation of the feasibility of the biosparge remedial alternative before the designing of an effective pilot test for the remedy. This evaluation consisted of a review of samples collected and analyzed for chemical, biochemical, and biological parameters for comparison to design criteria in USEPA guidance. The Transmission Store, a leaking underground fuel tank (LUFT) site located approximately 300 feet northwest of the Site had also selected biosparge as a remedial alternative in their FS/RE. CVRWQCB urged PSC to review the success or lack of success of pilot testing at the Transmission Store. In addition, CVRWQCB also urged PSC to review the recently approved implementation of an Air Sparging/Soil Vapor Extraction (AS/SVE) remediation system at the Dolly Madison site located immediately south of the Site. AS/SVE was the second most feasible remedial alternative in PSC's FS/RE. Sara Lee has entered into a Commingled Plume Account (CPA) with three other LUFT sites in the vicinity. These other sites include the former Texaco station located immediately north of the Site; the former ARCO station located approximately 250 feet north of the Site; and the ' Chevron station located 100 feet northwest of the Site. PSC submitted a Commingled Plume Verification Report to the CVRWQCB for the four sites on September 25, 2009. The CPA application including a signed cost sharing agreement was submitted to the California State Water Resources Control Board (SWRCB) UST Fund on November 20, 2009. The CVRWQCB has reviewed the Verification Report and has indicated that they will provide a concurrence letter to the UST Fund within five days of application submittal. ' PSC has discussed data gaps for the commingled plume with the Responsible Parties (RPs) of the `BP West Charter Way Commingled Plume Account". The wells installed in July 2009 ' and documented in this Report were installed in locations and at depths that address data gaps for the Site, as well as for the commingled plume. Assessment of remaining data gaps and preparation of a Commingled Plume Site Conceptual Model should be completed in 2010. 1 This report provides a brief summary of the site description, corrective action history, and environmental setting in Section 1. Section 2 presents a summary of the procedures and Monitoring Well Installation and BioSparge Evaluation Report Prepared For:Sate Lee Bakery Group,Inc. I Prepared By:PSC Industrial Outsourcing,LP Sam Lee—Lincoln Street 2009_I2 03-MW Installation&BioSparge Evaluation Report(Final).dac Report Date:December 3,2009