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r • Quarterly Report - Fourth Quarter 2002 r GRANT LINE GAS & FOOD 2420 Grant Line Road, Tracy, California r10. INTRODUCTION rAt the request of Mr Joe Toste Jr, Advanced GeoEnvironmental,'Inc (AGE), has prepared this quarterly report for field activities performed at 2420 Grant Line Road,Tracy, California during the fourth quarter 2002 The site setting is illustrated in Figure 1 Monitoring well and boring locations ron the site are illustrated in Figure 2 A detailed summary of previous work performed at the site was presented in the AGE-prepared documents titled Quarterly Report-March 1996,dated 15 April 1996 and QuarterlyReport--March 1999, dated 10 May 1999 Monitoring and sample data from January 1994 to the p resent are rsummarized in Tables 1 through 3 of this report I2.0 PROCEDURES This report is prepared in accordance with Central Valley Regional Water Quality Control Board . (CVRWQCB)guidelines for investigation of underground storage tank(UST)sites The field work was conducted in accordance with San Joaquin County Environmental Health Department (EHD) guidelines for sampling ground water monitoring wells I 2 1 WELL MONITORING AND EVACUATION On 19 December 2002, the water levels in monitoring wells MW-1 through MW-8 were measured relative to the tops of the well casings using a Solinst water level meter After water levels were measured, wells MW-2 through MW-8 were evacuated (purged) utilizing a dedicated, disposable plastic bailer, approximately 15 to 6 gallons (a minimum of three casing-water volumes per well) of water were removed from each well Monitoring well MW-1 was not purged or sampled, stormwater runoff was flowing into the well box at the time of the monitoring event Temperature, pH and conductivity of the purged ground water were measured at regular intervals using an Oakton water analyzer during purging, the measurements had stabilized by the end of the purging process Purged water was stored on-site in labeled 55-gallon,Department ofTransportation(DOT)-approved drums Field logs are included in Appendix A 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Prior to collection of ground water samples,the depth to ground water was gauged in each purged . well (MW-2 through MW-8) to ensure that a minimum of 80% of the initial well volume had Irecharged Afterwards, water samples were collected from wells MW-2 through MW-8 using the Advanced GenEnwronmental Inc