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1 <br /> r Quarterly Report - Third Quarter 2003 <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 woi k was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to character ize 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- Central 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 climacteiistics data obtained by a CPT investigation enabled AGE to define four <br /> informal hydiogcologic units (Quarterly Report - Second Quarter 2000, dated 31 July 2000) The <br /> informal hydiogeologic 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 26 August 2003 Ground <br /> water monitoring procedures for the site were outlined in Work Plan Addendum -June 2001, dated <br /> 11 June 2001 and approved by the San Joaquin County Environmental Health Department <br /> I (SJCEHD) by letter dated 07 July 2001 <br /> At the request of the SJCEHD, the August 2003 ground water monitoring events performed at the <br /> Top Filling Station site and the Knowles-Rock site (102 South Wilson Way) was coordinated to <br /> occur at the same time, the Knowles-Rock ground water elevations and analytical results are <br /> tabulated and included in Appendix A <br /> 21 WELL MONITORING AND PURGING <br /> Depth to ground water was measured in each well from the top of the well casing to the nearest <br /> 0 01-foot utilizing a Sol irist water level rneter Groundwater was not encountered in wells VW-IA, <br /> VW-1B, VW-2B and VW-3B and was reported as dry, less than 1-foot of ground water was <br /> • measured at wells MW-6A and MW-7A,however ground water could not be recovered and the wells <br /> Advanced GcoEnvironmentai,Inc <br /> I <br />