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Annual Ground Water Monitoring Report - Third Quarter 2012 Former OCAMPO PROPERTY 821 South Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Victor Aranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared this annual ground water monitoring report for the property located at 821 South Wilson Way, Stockton, California (site). The scope of work included performance of an annual ground water monitoring event and preparation of this report. An extended 60-day in-situ air sparging (IAS) pilot test performed at the site between 16 March and 16 May 2012. 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. Ground water monitoring was performed in accordance with Appendix A - Reports, Tr- Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Storage Tanks, dated 16 April 2004, prepared by the Central Valley Regional Water Quality Control Board. 2.0. PROCEDURES On 13 July 2012, an annual ground water monitoring event was conducted utilizing site wells MW-1 through MW-6, in accordance with the San Joaquin County Environmental Health Department-approved modified sampling schedule (described in Appendix B). During the monitoring event, vehicles were parked over wells MW-1 and MW-2 and the wells were neither gauged or sampled. Monitoring 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. FINDINGS Ground water elevation and flow direction were inferred from field data; hydrocarbon-impact to ground water was quantified by laboratory analysis of ground water samples. Findings at the time of the July 2012 sampling event are as follows: Shallow Monitoring Wells MW-1 through MW-5 (screened between 35 and 55 feet bsg) Depths to ground water ranged between 32.23 (MW-4) feet below top of casing (btoc) and 32.68 feet btoc (MW-5; Table 1). Ground water elevation at the site ranged between 14.05 feet (MW-4) and 14.10 feet (MW-3 and MW-5) below North American Vertical Datum (NAVD88). Advanced GeoEnvironmental, Inc.