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Quarterly Ground Water Monitoring Report - Third Quarter 2011 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 quarterly report for the property located at 821 South Wilson Way, Stockton, California (site). The scope of work included performance of a quarterly 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. 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 03 August 2011, a quarterly 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). 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 August 2011 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 32.97 (MW-4) feet below top of casing (btoc) and 33.91 feet btoc (Table 1). Ground water elevation at the site ranged between 14.79 feet (MW-4) and 14.91 feet (MW-2) below North American Vertical Datum (NAVD88). Ground water flow across the site was inferred to be away from well MW-5 to the northwest and southwest under a calculated hydraulic gradient of 0.003 foot per foot (ft/ft). Figure 3 illustrates contoured ground water elevations as measured on 03 ,4dvanced GeoEnvironmental, Inc.