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Quarterly Report - First Quarter 2003 <br /> TOP FILLING STATION <br /> I101 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 I Site structures and <br /> monitoring well locations are depicted on Figure 2 <br /> The obj echve of 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- 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 /> I Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four <br /> informal hydrologic units (Quarterly Report - Second Quarter 2000, dated 31 July 2000) The <br /> informal hydrologic units were defined as Hydrologic Unit 1 (30 to 55 feet bsg),Hydrologic Unit 2 <br /> (55 to 65 feet bsg), Hydrologic Unit 3 (65 to 85 feet bsg) and Hydrologic Unit 4 (85 to at least 100 <br /> feet bsg) <br /> 2.0. MONITORING AND SAMPLING PROCEDURES <br /> A quarterly ground water monitoring event was performed at the site on 04 March 2003 Ground <br /> water monitoring procedures for the site were outlined 1n Work Plan Adendum -June 2001, dated <br /> 11 June 2001 and approved by the San Joaquin County Environmental Health Department (EHD) <br /> by letter dated 07 July 2001 <br /> I2 1 WELL MONITORING AND EVACUATION <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 Solmst water level meter, ground water was not encountered at wells VW-1A, <br /> VW-2B and VW-3B and was reported as"dry" The ground water elevation at wells MW-1 through <br /> MW-7,VW-1 C,VW-2A and VW-3A were calculated by subtracting the measured depth to ground <br /> water from the surveyed casing elevation As-built monitoring well construction details are <br /> summarized in Table 1, ground water elevations were plotted and contoured on a scaled site map <br /> (Figure 3) <br /> • <br /> IAdvanced GcoEnvironmental,Inc <br />