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IQuarterly Report - Second Quarter 2004 <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 GeoEnvironrnental, Inc (AGE) has <br /> Iprepared 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 in May 2004(Second <br /> I Quarter 2004), laboratory analysis of ground water samples, data analysis and preparation of this <br /> report The site setting is illustrated on Figure 1 A plan view of the site is Illustrated on Figure 2 <br /> Site background information is Included in Appendix A Quarterly monitoring data from February <br /> I1998 to present is summarized in the tables of this report <br /> I2.0. 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 /> 2 1 WELL MONITORING AND EVACUATION <br /> IOn 12 May 2004, a technician was sent out to the site to verify the total depths of the clustered wells <br /> MW-IA,MW-1B and MW-7 due to previous well identification mix-ups since the reinstallation of <br /> Ithe aforementioned wells in June 2003 (see field notes included in Appendix B) On 19 May 2004, <br /> a Solinst water level meter was used to measure the depth to ground water in nine monitoring wells <br /> (MW-1A through MW-7) relative to the top of the well casing After ground water depth <br /> measurements were recorded, the wells were purged using 5/8-inch dedicated polyethylene tubing <br /> and a Watera Hydro-Lift 11 pump, between 3 and 16 gallons of water (equivalent to three <br /> I casing-water volumes) were evacuated from wells MW-lA through MW-7 Temperature, pH and <br /> conductivity were measured at regular purge volume Intervals with an Oakton water analyzer Field <br /> logs and purge sheets are included in Appendix B Purged water was stored on-site in properly <br /> labeled Department of Transportation (DOT)-approved 55-gallon drums <br /> I2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> The depth to ground water was re-measured in each well following evacuation to assure a minimum <br /> I of 80%recharge prior to sampling Water samples were subsequently collected using the dedicated, <br /> disposable bailers The water sample from each well was transferred into three chilled 40-milliliter <br /> . (ml) volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample <br /> Advanced Geo Environmental,Inc <br /> I <br />