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Quarterly Report - Fourth 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 underground storage tank (UST) locations, and monitoring well <br /> locations are illustrated on Figure 2. Additional site background information is provided in <br /> Appendix A. <br /> 1 ' <br /> 2.0. PROCEDURES <br /> On 21 December monitoring wells MW-1 through MW-10 were monitored and sampled. All field <br /> work was performed in accordance with guidelines issued by the California Regional Water Quality <br /> Control Board - Central Valley Region (RWQCB) for the investigation of UST sites. <br /> 2.1. WELL MONITORING AND PURGING <br /> ' A Solinst water level meter was used to measure the depth to ground water in monitoring wells <br /> MW-1 through MW-10 relative to the tops of the well casings. After the depth to ground water <br /> measurements were collected,casing water in the wells was evacuated using dedicated, disposable <br /> ' plastic bailers.Approximately 5.5 to 6.5 gallons of water were evacuated from shallow wells MW-1 <br /> through MW-5 and MW-7 through MW-10;approximately 13.5'gallons of water were removed from <br /> deep well MW-6.All purged amounts were equivalent to a minimum of three casing-water volumes <br /> 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 plastic bailer after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume. Each water <br /> r sample was transferred into laboratory-supplied 40-milliliter(ml)volatile organic analysis (VOA) <br /> 1 vials containing 0.5 ml 18% hydrochloric acid solution as a sample preservative. <br /> ' 'Advanced GeoEnvironmental,Inc. <br /> 1 <br />