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' Quarterly Report - Third Quarter 2000 <br /> CALIFORNIA FUELS CARDLOCK STATION <br />' 2402 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental,Inc (AGE)has prepared this quarterly report for 2402 Pacific Avenue, <br /> Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well <br /> locations are depicted on Figure 2 <br /> IThe objective of the work was to monitor dissolved petroleum hydrocarbon concentrations to ground <br /> water, to characterize ground water flow direction and gradient and to monitor the effectiveness of <br /> I soil vapor extraction (SVE) and to-situ air sparging (IAS) remediation at the site This report is <br /> prepared in accordance with guidelines established by the California Regional Water Quality Control <br /> Board - Central Valley Division (RWQCB) for investigation of underground storage tank (UST) <br /> I sites <br /> A summary of previous investigations at the site was included to the Corrective Action Plan-May <br /> 1998, dated 05 May 1998 and prepared by AGE Analytical data acquired to date is included in this <br /> report <br /> 2.0 GROUND WATER MONITORING AND SAMPLING PROCEDURES <br /> On 29 September 2000, ground water monitoring and sampling were performed at the site on wells <br /> MW-1 through MW-13, AW-1A, AW-1B, AW-2A and AW-2B Ground water momtonng <br /> procedures for the site were outlined in Work Plan Addendum, dated 16 May 2000 and conform to <br /> ground water monitoring guidelines issued by the San Joaquin County Public Health Services - <br /> f Environmental Health Division (PHS-EHD) <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> Depths to ground water were measured at wells MW-1 through MW-13, AW-lA, AW-113, AW-2A <br /> and AW-213 from the tops of the well casings at the site to the nearest 0 01-foot utilizing a Solinst <br /> water level meter Ground water elevations in each well at the site were calculated by subtracting the <br /> measured depth to ground water from the surveyed well casing elevations (Tabic 1) Ground water <br /> elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 8 to 13gallons of ground water (a minimum of <br /> three casing-water volumes per well) were removed from wells MW-1 through MW-10, MW-12, <br /> AW-IA, AW-1B, AW-2A and AW-2B utilizing a submersible pump, ground water pumping was <br /> initiated at the top of the water column and the pump was slowly lowered to total depth to purge <br /> ground water within the entire well casing Approximately 1!/2 gallons of ground water were <br /> I <br />