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1 <br /> . Quarterly Report W Fourth Quarter 2002 <br />' Former CURTISS PONTIAC-BUICK <br /> 2450 Toste Road, Tracy, California <br />' 1.0. INTRODUCTION <br />' At the request of Mr. Joe Toste of J.T. Storage, Advanced GeoEnvironmentai, Inc. (AGE) has <br /> prepared this quarterly report for 2450 Toste Road, Tracy, California(the site). The scope of work <br /> included monitoring and sampling the ground water monitoring well network, laboratory analysis <br /> I of ground water samples, data analysis and preparation of this report. The site setting is illustrated <br /> in Figure 1. A plan view of the site is illustrated in Figure 2. <br />' Summaries of previous investigations at the -site are included in the AGE-prepared Preliminary <br /> Investigation and Evaluation Report(PIER), dated 15 August 1997 and Quarterly Report, dated 18 <br /> September 1997. Quarterly monitoring data from February 1998 to present is summarized in <br />' Tables 1 and 2.of this report. <br /> 2.0. PROCEDURES <br /> Field work was conducted and this report was prepared in accordance with guidelines issued by the <br /> . Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigation <br /> of underground storage tank (UST) sites and guidelines issued by the San Joaquin County <br /> Environmental Health Department (EHD) for sampling ground water monitoring wells. <br /> I2.1. WELL MONITORING AND EVACUATION <br /> On 31 October 2002, a Solinst water level meter was used to measure the depth to ground water in <br /> each well relative to the top of the well casing. After ground water depth measurements were <br /> recorded,-monitoring wells MW-1 through MW-7 were purged using disposable plastic bailers. <br /> Between 4 and 11 gallons of water were evacuated from monitoring wells MW-1 through MW-6, <br /> equivalent to three casing-water volumes per well. Monitoring well MW-7 was bailed dry after <br /> evacuating approximately one well volume (6 gaIlons). Temperature, pH and conductivity were <br /> measured at one- or two-gallon intervals with an Oakton water analyzer. Logs of the field data are <br /> included in Appendix A.Purged waterwas stored on-site in labeled DOT-approved 55-gallon drums. <br /> Ground water monitoring data from monitoring well GLMW-3,located at Grant Line Gas and Food, <br /> 2420 Grant Line Road, has been included in this investigation to determine ground water flow <br /> direction and gradient. <br /> Advanced GeoEnvironmental Inc. <br /> I <br />