Laserfiche WebLink
1 <br /> Quarterly Report - Fourth Quarter 2003 and First 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 GeoEnvironmental, 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 in December 2003 <br /> (Fourth Quarter 2003) and March 2004 (First Quarter 2004), Iaboratory analysis of ground water <br /> samples,data analysis and preparation of this report The site setting is illustrated in Figure 1 A plan <br /> 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 /> 21 WELL MONITORING AND EVACUATION <br /> On 11 December 2003 (Fourth Quarter 2003) and 03 March 2004 (First Quarter 2004), a Solinst <br /> water level meter was used to measure the depth to ground water in nine monitoring wells(MW-1A <br /> through MW-7)relative to the top of the well casing After ground water depth measurements were <br /> recorded,the wells were purged using dedicated,disposable plastic bailers,between 4 and 11 gallons <br /> of water (equivalent to three casing-water volumes) were evacuated from wells MW-lA through <br /> MW-7 during the Fourth Quarter 2003 monitoring event, and between 4 and 17 gallons were <br /> evacuated during the First Quarter 2004 monitoring event Temperature,pH and conductivity were <br /> measured at two- or four-gallon intervals with an Oakton water analyzer Logs of the field data are <br /> included in Appendix A Purged water was stored on-site in labeled DOT-approved 55-gallon drums <br /> 22 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 /> of 80 percent recharge prior to sampling Water samples were subsequently collected using the <br /> Advanced GeoEnvironmental Inc <br />