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Semi-Annual Ground Water Monitor Report - Second Quarter 2012 BOULEVARD AUTOMOTIVE SERVICE 2151 Country Club Boulevard, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnviron mental, Inc. (AGE) has prepared this semi-annual ground water reportfor 2151 Country Club Boulevard, Stockton, California (the site). The scope of work included the performance of a semi-annual ground water monitoring event and the preparation of this report. The objective was to monitor dissolved petroleum hydrocarbon concentrations in the ground water and to characterize the ground waterflow direction and gradient at the site.The site setting is illustrated on Figure 1. Site structures and monitoring well locations are depicted on Figure 2. Previous soil characteristics'data obtained by a CPT investigation enabled AGE to identify six informal hydrogeologic units (Cone Penetrometer Testing Site Investigation - Third Quarter 2005, dated 18 October 2005). The units were defined as Hydrogeologic Unit 1 (10-30 feet below surface grade [bsg]), Hydrogeologic Unit 2 (30-50 feet bsg), Hydrogeologic Unit 3 (50-70 feet bsg), Hydrogeologic Unit 4 (70-85 feet bsg), Hydrogeologic Unit 5 (85-110 feet bsg) and Hydrogeologic Unit 6 (110 to at least 125 feet bsg). This report has been prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST)sites. Monitoring well construction details are summarized in Table 1. Ground water monitoring data acquired to date is included in Table 2. 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES On 27 June 2012, a semi-annual ground water monitoring event was conducted at the site by collecting depth to water measurements from wells MW-1 through MW-7, MW-10A through MW-10E, MW-12 through MW-16, MW-19 through MW-24, and dual phase extraction (DPE)wells DPE-1 and DPE-2. Following these measurements, ground water samples were collected at wells MW-7, MW-10B, MW11A, MW-12, MW-13, MW-14, MW-16, MW-19, DPE-1 and DPE-2 in accordance with San Joaquin County Environmental Health Department's(SJCEHD)semi-annual groundwater monitoring requirements(dated 23 March 2009). Due to parked vehicles, monitoring wells MW-9, MW-17 and MW-18 were not accessible during the June 2012 monitoring and sampling event. Monitoring was performed in accordance with AGE's standard monitoring and sampling procedures, provided in Appendix A. Field data and logs are provided in Appendix B. No exceptions to AGE's standard procedures were noted. Advanced GnoEnvironmental,Inc.