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Quarterly Report - Second Quarter 2004 • TOP FILLING STATION 101 South Wilson Way, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 101 South Wilson Way(the site), Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site This report has been prepared in accordance with guidelines issued by the California Regional Water Quality Control ' Board- Central Valley Region(CVRWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site was included in the AGE-prepared Quarterly ' Report- Third Quarter 2002, dated 13 December 2002 Ground water monitoring data acquired to date is included in the tables of this report ' Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four informal hydrogeologic units (Quarterly Report - Second Quarter 2000, dated 31 July 2000) The informal hydrogeologic units were defined as Hydrologic Unit 1 (30 to 55 feet bsg), Hydrologic Unit 2(55 to 65 feet bsg),Hydrologic Unit 3 (65 to 85 feet bsg)and Hydrologic Unit 4(85 to at least 100 feet bsg) ' 2.0. MONITORING AND SAMPLING PROCEDURES ' A quarterly ground water monitoring event was performed at the site on 11 May 2004 Ground water monitoring procedures for the site were outlined in Work Plan Addendum-June 2001, dated 11 June 2001 and approved by the San Joaquin County Environmental Health Department (SJCEHD) by ' letter dated 07 July 2001 At the request of the SJCEHD,the May 2004 ground water monitoring events were performed at the ' Top Filling Station site and the Knowles-Roek site (102 South Wilson Way) on near dates, the Knowles-Roek ground water elevations and analytical results are tabulated and included in ' Appendix A ' 2 1 WELL MONITORING AND PURGING On 11 May 2004, depth to ground water was measured in each well from the top of the well casing ' to the nearest 0 01-foot utilizing a Solinst water level meter Groundwater was not encountered in wells VW-1A,VW-1B, VW-2B and VW-313 and was reported as `dry', ground water could not be recovered from wells MW-6A and MW-7A and the monitoring locations were subsequently reported ' Advanced GeoEnvironmental,Inc