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;•, Quarterly Report - Fourth Quarter 2002 BOB'S MUFFLER SHOP : 466'Moffat Boulevard, Manteca, California INTRODUCTION ' At the request of Mr. Tom Barbour of Bob's Muffler Shop, Advanced GeoEnvironrnehta1, Inc. (AGE)has prepared this quarterly report for the property located at 466 Moffat Boulevard,Manteca, California.The scope of work included a quarterly ground water.monitoring event and preparation ' of this report. The location of the site and the immediately surrounding area'are illustrated on Figure 1;structures,former UST-locations and monitoring well locations are illustrated on Figure 2. Site background information is provided in Appendix A. 2.0., PROCEDURES Monitoring wells MW-1 through-MW-7, MW-9,and MW-10 were monitored and sampled on 16 Deceinber 2002;well MW-8 was not sampled during this monitoring event due to a combination of localized flooding and equipment parked, over the well: All field work was performed in accordance with guidelines issued by Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites.. 2.1. - WELL MONITORING AND EVACUATION On 16.December2002, a Solinst water level meter was used to measure the depth to ground water ' in the nine wells relative to the tops of the well casings. After the depth-to-ground water measurements were collected,casing water in monitoring wells MW-2-through MW-7, MWr.9 and MW-10 were evacuated using dedicated, disposable plastic bailers and well MW-1 was evacuated '- using vacuated '- using a Watera hydro-lift pump. Approximately seven gallons of water were evacuated from wells' MW-1 through MW-5, MW-7, MW-•9 and MW-10; 14 gallons of water were removed from well MW-6. All purged amounts were equivalent to three casing-water volumes per well. Temperature, pH and conductivity were measured at regular intervals during purging using an _ gP g g g Oakton water analyzer to monitor pH, temperature and conductivity of the purged water. Purged ' waterwas temporarily stored on-site in properly labeled DOT-approved 55-gallon drums. The field data logs are-provided in Appendix B. 2:2. . COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' A water sample was collected from each purged well with a dedicated, disposable bailer after ' allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Each water • sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0.5 ml 18% . Advanced GeoEnvironmentai,lnc.