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' Quarterly Report - First Quarter 2004 <br /> TOP FILLING STATION <br /> 101 South Wilson Way, Stockton, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 101 South Wilson <br /> Way (the site), Stockton, California The site setting is illustrated on Figure 1 Site structures and <br /> monitoring well locations are depicted on Figure 2 <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report has been <br /> prepared in accordance with guidelines issued by the California Regional Water Quality Control <br /> Board- CentraI Valley Region(CVRWQCB) for investigation of underground storage tank (UST) <br /> sites A summary of previous investigations at the site was included in the AGE-prepared Quarterly <br /> Report- Third Quarter 2002, dated 13 December 2002 Ground water monitoring data acquired to <br /> date is included in the tables of this report <br /> Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four <br /> informal hydrogeologic units (Quarterly Report- Second Quarter 2000, dated 31 July 2000) The <br /> informal hydrogeolog>c units were defined as Hydrologic Unit 1 (30 to 55 feet bsg), Hydrologic <br /> Unit 2(55 to 65 feet bsg),Hydrologic Unit 3 (65 to 85 feet bsg)and Hydrologic Unit 4(85 to at least <br /> 100 feet bsg) <br /> 2.0. MONITORING AND SAMPLING PROCEDURES <br /> A quarterly ground water monitoring event was performed at the site on 09 February 2004 On <br /> 19 February 2004,well MW-6E was re-sampled to confirm elevated concentrations detected during <br /> the 09 February 2004 sampling event Groundwater monitoring procedures for the site were outlined <br /> in Work Plan Addendum -June 2001, dated 11 June 2001 and approved by the San Joaquin County <br /> Environmental Health Department (SJCEHD) by letter dated 07 July 2001 <br /> At the request of the SJCEHD, the February 2004 ground water monitoring events were performed <br /> at the Top Filling Station site and the Knowles-Rock site (102 South Wilson Way) on near dates, <br /> the Knowles-Rock ground water elevations and analytical results are tabulated and included in <br /> Appendix A <br /> I2 1 WELL MONITORING AND PURGING <br /> On 09 February 2004, depth to ground water was measured in each well from the top of the well <br /> . casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water was not <br /> encountered in wells VW-1A,VW-IB,VW-213 and VW-3B and was reported as`dry',ground water <br /> Advanced GeoEnvironmental,Inc <br /> I <br />