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Quarterly Report - Third Quarter 2004 • BOB'S MUFFLER SHOP t466 Moffat Boulevard, Manteca, California ' 1.0. INTRODUCTION At the request of Mr. Tom Barbour of Bob's Muffler Shop, Advanced GeoEnvironmental, 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 underground storage tank (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-9 were monitored and sampled on 10 September 2004. Monitoring well MW-10 was beneath a truck and was inaccessible. All field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of UST sites. 2.1. WELL MONITORING AND PURGING ' A Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-9 relative to the tops of the well casings. After the depth to ground water measurements were collected, casing water in the wells was evacuated using dedicated, disposable ' plastic bailers.,Approximately 3.5 to 4.5 gallons of water were evacuated from shallow wells MW-1 through MW-5 and MW-7 through MW-10; approximately 12 gallons of water were removed from deep well MW-6.All purged amounts were equivalent to a minimum of three casing-water volumes ' per well. Temperature, pH, and conductivity of the purged water were-measured at regular intervals during ' purging using an Oakton water analyzer. Purged water was temporarily stored on-site in properly labeled, Department of Transportation (DOT)-approved 55-gallon drums. The field data logs are provided in Appendix B. 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES 1 A water sample was collected from each purged well with a dedicated,disposable plastic bailer after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Eachwater 1. sample was transferred into laboratory-supplied 40-milliliter(ml) volatile organic analysis (VOA) • vials containing 0.5 ml 18% hydrochloric acid solution as a sample preservative. ' Advanced GeoEnvironmental,Inc.