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Third Quarter 2000 Monitoring and Sampling Report 2 <br /> 7-Eleven Inc Store#21756 853 E Yosemite Avenue,Manteca CA August 15 2000 <br /> ' Monitoring Well Sampling and Analytical Results <br /> On July 20, 2000, groundwater samples were collected from the three monitoring wells Dissolved oxygen <br /> (DO) concentrations were measured in the three wells prior to sampling The groundwater samples were <br /> collected using disposable bailers Groundwater samples were placed in analysts-specific containers with <br /> analysts-specific preservative The samples were then sealed using Teflon septum caps, labeled with the <br /> fob identification number, the sample number, date, time, and type of laboratory analysts required The <br /> samples were stored on ice and transported with a chain-of-custody record to a state-certified laboratory <br /> ' Groundwater samples were analyzed for BTEX, MTBE, and TPH-G using EPA methods 8021/modified <br /> 8015 and for the oxygenates MTBE, TBA, DIPE, ETBE, and TAME using EPA method 8260 <br /> Dissolved oxygen readings ranged from 0 4 mg/L in MW-1 to 0 7 mg/L in MW-3 (Table 1) <br /> Laboratory analytical results for groundwater samples collected on July 20, 2000 and historical results are <br /> ' summarized in Table 1 Dissolved benzene concentrations were below the reporting limit of 0 5 <br /> micrograms per liter(pg/L) and TPH-G below 100 pg/L in the wells sampled The highest dissolved <br /> MTBE concentration was detected in downgradtent well, MW-1 at 2,100 pg/L The other oxygenates were <br /> not reported above detection limits in any of the wells sampled during the third quarter 2000 The <br /> laboratory analytical reports for the groundwater samples are included in Attachment 4 <br /> Well Search <br /> As mentioned in the previous quarterly report, IT Corporation performed a well search using multiple <br /> ' sources of information to assemble a database for public water supply wells located within one mile of the <br /> site The database for this site indicates that the nearest well is an active municipal well located 1,987 <br /> feet downgradtent of the site, it is 155 feet deep, with top of screen at approximately 65 feet below grade <br /> Purge Water Transportation and Disposal <br /> ' Approximately 9 gallons of purge water generated during this quarterly monitoring and sampling event was <br /> stored in 55-gallon Department of Transportation (DOT)-approved drum pending characterization and <br /> proper disposal by a licensed waste hauling company <br />