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' Quarterly Report - Second Quarter 2003 '. Y P . BOB'S MUFFLER SHOP 1 466 Moffat Boulevard, Manteca, California ' 1.0. INTRODUCTION At the request of Mr. Tom Barbour of Bob's Muffler Shop, Advanced GeoEnvironmental, Inc. 1' (AGE)has prepared this quarterly report for the property located at 466 Moffat BouIevard,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 1 Monitoringwells MW-1 through MW-10, with the exception of well MW-8, were monitored and g P sampled on 09 June 2003.MW-8 could not be monitored or sampled due to a trailer that was parked 1 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 PURGING On 09 June 2003, a Solinst water level meter was used to measure the depth to ground water in nine wells relative to the tops of the well casings. After the depth-to-ground water measurements were collected, casing water in the wells were evacuated using dedicated, disposable plastic bailers. Approximately 6.0 to 6.5 gallons of water were evacuated from wells MW-1 through MW-5 and MW-7 through MW-10 and 13.25 gallons of water were removed from well MW-6. All purged ' amounts were equivalent to three casing-water volumes per well. 1 Temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer to monitor pH, temperature and conductivity of the purged water. Purged water was 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% • hydrochloric acid as a sample preservative. After collection, the samples were properly labeled, Advanced GmEnvironmental,Inc.