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. Quarterly Report- Third Quarter 2003 BOB'S MUFFLER SHOP ' 466 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'aiid 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-3 exception thrdu h MW-10, with the tion of wells MW-1 and MW-2, were g p _ monitored and sampled on 27 August 2003. Wells MW-1 -and MW-2 could not be monitored or ' sampled due to a temporary well blocking access to these wclls.. 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 ' n 27'August 2003 a Solinst water level meter was u measure h • O ,� s sed to asu e t e depth to ground water in . eight 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 5.25 to 5.5 gallons of water were evacuated from wells MW-3 through MW-5 and MW-7 through MW-10 and 12.25 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 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-i1 volatile organic analysis (VOA) vials ., containing 0.5 ml 18%hydrochloric acid as a sample preservative.After collection,the samples were Advanced GeoEnvironmental,Inc'.