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Semi-Annual Ground Water Monitoring Report - Second Quarter 2012 STALLWORTH AUTO SALES 602 North California Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Gary Stallworth, Advanced GeoEnvironmental, Inc. (AGE) has prepared this ground water monitoring report for the property located at 602 North California Street, Stockton, California (site). The scope of work included the performance of a ground water monitoring event in April 2012 and preparation of this report.Additionally, the semi-annual event included baseline ground water sampling in preparation for in-situ chemical oxidation (ISCO) remediation at the site. The site and surrounding area are illustrated in Figure 1. On-site structures and monitoring well locations are illustrated in Figure 2. Site background information is summarized in Appendix A. Field work was performed in accordance with guidelines established by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites and the San Joaquin County Environmental Health Department (EHD)for the sampling of ground water monitoring wells. 2.0. PROCEDURES On 24 April 2012, a semi-annual ground water monitoring event was performed on all of the site wells, with the exception of well MW-2; Well MW-2 was covered by a parked vehicle and was not accessible for the monitoring event. Ground water samples were collected for laboratory analyses from wells MW-1A, MW-1 C, and MW-6 through MW-10. Monitoring and sampling was performed in accordance with AGE's standard monitoring and sampling procedures (Appendix B), with one exception; analysis for total petroleum hydrocarbons quantified as diesel (TPH-d) was inadvertently omitted from the sampling suite. Additionally, In accordance with the Stallworth Auto Sales Draft Monitoring and Reporting Program (MRP) R5-2008-0149, wells MW-1A, MW-6, MW-7, and MW-8 were sampled for the constituents listed in Table 2 of the MRP and monitored for the parameters listed in Table 3 of the MRP (Appendix C). Field data and logs are provided in Appendix D. 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 24 April 2012; contaminant impact to ground water was quantified by laboratory analytical data. At the time of the 24 April 2012 sampling event: Advanced GeoEnvironmental,Inc.