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Semi-Annual Ground Water Monitoring Report - October 2011 STALLWORTH AUTO SALES 602 North California Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Gary Stallworth, Advanced Geo Environmental, 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 performance of a semi-annual ground water monitoring event and preparation of this report. 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 20 and 21 October 2011, a semi-annual monitoring event was performed on all of the sites wells; samples were collected for laboratory analyses from wells MW-1 A, MW-1 C, MW-1 D and MW-2 through MW 11. Monitoring and sampling was performed in accordance with AGE's standard monitoring and sampling procedures, provided in Appendix B. Field data and logs are provided in Appendix C. No exceptions to AGE's standard procedures were noted. 3.0. NON-HAZARDOUS WASTE REMOVAL On 11 November 2011, Instrat Incorporated of Rio Vista, California, transported and disposed of approximately 250 gallons of non-hazardous purge water generated during the fourth quarter 2011 monitoring event. Purge water removed from the site was transported to Instrat's facility where it was properly treated and disposed. The non-hazardous waste manifest is included in Appendix D. 4.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 20 and 21 October 2011; contaminant impact to ground water was quantified by laboratory analytical data. At the time of the October 2011 sampling event: Advanced CeoEnvironmental,Inc.