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IQuarterlort - October 1998 <br /> Y Report <br />' CALIFORNIA FUELS CARDLOCK STATION <br /> 2402 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental, Inc <br /> (AGE)has prepared this Quarterly Report for 2402 Pacific Avenue, Stockton, California The site <br /> setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure <br /> 1 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 is <br /> prepared in accordance with guidelines established by the San Joaquin County Public Health <br /> Services - Environmental Health Division(PHS-EHD) and by the Central Valley Regional Water <br />' Quality Control Board(CVRWQCB) for investigation of underground storage tank(UST) sites A <br /> summary of previous investigations at the site was included in the Corrective Action Plan- May <br />' 1998, dated 05 May 1998 and prepared by AGE <br />' 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES <br /> On 22 October 1998,ground water monitoring and sampling were performed at wells MW-1 through <br />' MW-12, VW-1,AW-1B and AW-2B <br />' 2 1 MONITORING WELL PURGE PROCEDURES <br /> Depths to ground water were measured from the top of each well casing at the site to the nearest 0 01 <br /> tfoot utilizing a Solinst water level meter Ground water elevations in each well at the site were <br /> calculated by subtracting the measured depth to ground water from surveyed casing elevations <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> 1 <br /> After water levels were measured, approximately 4 to 15 gallons of ground water (a minimum of <br /> three well-volumes per well)were removed from wells MW-1 through MW-12,VW-1,AW-1B and <br /> AW-2B utilizing a two-stage submersible pump,the first Two gailoms were removed utilizing a tenon <br /> bailer and new rope Approximately 3 gallons of ground water were removed from well MW-I 1 <br /> 1 before being pumped "dry". Temperature, pH and conductivity were measured for stabilization at <br /> regular purge volume intervals from each well using an ICM Model 52200 water analyzer Field data <br /> and logs are included with Appendix A Purged ground water was containerized to 55-gallon drums <br /> and was stored on-site in an area lacking general public access <br />