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' Quarterly Report - Second Quarter_ 2004 <br /> • BOB'S MUFFLER SHOP <br /> ' 466 Moffat Boulevard, Manteca, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Tom Barbour of Bob's Muffler Shop, Advanced GeoEnvironmental, Inc. <br /> (AGE)has prepared this quarterly report for the-property located at 466 Moffat Boulevard,Manteca, <br /> California. The scope of work included a quarterly ground water monitoring event and preparation <br /> of this report. The location of the site and the immediately surrounding area are illustrated on <br /> Figure 1.Structures,former UST locations,and monitoring well locations are illustrated on Figure 2. <br /> Site background information is provided in Appendix A. <br /> 2.0. PROCEDURES <br /> ' Monitoring wells MW-1 through MW-10 were monitored and sampled on 17 June 2004. All field <br /> work was performed in accordance with guidelines issued by the Central Valley Regional Water <br /> ' Quality Control Board (RWQCB) for the investigation of underground storage tank (UST) sites. <br /> 2.1. WELL MONITORING AND PURGING <br /> On 17 June 2004, a Solinst water level meter was used to measure the depth to ground water in ten <br /> wells relative to the tops of the well casings,. After the depth-to-ground water measurements were <br /> collected, casing water in the wells was- evacuated' using dedicated, disposable plastic bailers. <br /> Approximately 5 to 5.5 gallons of water were evacuated from wells MW-1 through MW-5 and <br /> ' MW-7 through MW-10; approximately 12 gallons of water were removed from well MW-6. All <br /> purged amounts were equivalent to a minimum of three casing-water volumes per well. <br /> Temperature, pH, and conductivity of the purged water were measured at regular intervals during <br /> purging using an.Oakton water analyzer. Purged water was temporarily stored.on-site in properly <br /> labeled Department of Transportation (DOT)-approved 55-gallon drums. The field data logs are <br /> provided in Appendix B. <br /> ' 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> A water sample was collected from each purged well with a dedicated, disposable bailer after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Each water <br /> sample was transferred into laboratory-supplied 40-milliliter(ml)volatile organic analysis (VOA) <br /> vials containing 0.5 ml 18% hydrochloric acid as a sample preservative. <br /> ' Advanced GeoEnviron mental,Inc. <br /> 1 <br />