ARCHIVED REPORTS_XR0009413 - Laserfiche WebLink

Home Browse Search

Quarterly Report - Third Quarter 2002 Former CURTISS PONTIAC-BUICK 2450 Toste Road, Tracy, California i1.0. INTRODUCTION I At the request of Mr Joe Toste of J T Storage, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 2450 Toste Road, Tracy, California(the site) The scope of work included monitoring and sampling nine groundwater monitoring wells,laboratory analysis of ground water samples, data analysis and preparation of this report The site setting is illustrated in Figure 1 A plan view of the site is illustrated in Figure 2 I Summanes of previous investigations at the site are included in the AGE-prepared Preliminary Investigation and Evaluation Report(PIER),dated 15 August 1997 and Quarterly Report,dated 18 September 1997 Quarterly monitoring data from February 1998 to present is summarized in ITables 1 and 2 of this report I2.0. PROCEDURES Field work was conducted and this report was prepared in accordance with guidelines issued by the I • Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigation of underground storage tank (UST) sites and guidelines issued by the San Joaquin County Environmental Health Department (EHD) for sampling ground water monitoring wells I 2 1 WELL MONITORING AND EVACUATION On 23 July 2002, a Solinst water level meter was used to measure the depth to ground water in each well relative to the top of the well casing After ground water depth measurements were collected, monitoring wells MW-1 through MW-7 were purged using disposable plastic bailers Between 4 and 16 gallons of water were evacuated from each of the monitoring wells, equivalent to three casing-water volumes per well Temperature, pH and conductivity were measured at one- or two- gallon intervals with an Oakton water analyzer Logs of the field data are included in Appendix A Purged water was stored on-site in labeled DOT-approved 55-gallon drums I 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES The depth to ground water was re-measured in each well following evacuation to assure a minimum of 80%recharge pnorto sampling Water samples were subsequently collected using new disposable Iplastic bailers The water sample from each well was transferred into three chilled 40-m1 volatile • organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid (HCl) as a sample preservative In addition, water samples collected from wells MW-1A, MW-1B, MW-2A,MW2B IAdvanced GeoEnviron mental Inc