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Second Quarter 2001 Mondonng and Sampling Report 2 <br /> 7-Eleven Inc Store#21756 853 E Yosemde Avenue Manteca CA July 9 2001 <br /> 1 <br /> Monitoring Well Sampling and Analytical Results <br /> ' The groundwater samples were collected using disposable bailers Groundwater samples were placed In <br /> analysis-specific containers with analysis-specific preservative The samples were then sealed using Teflon <br /> ' septum caps, labeled with the job Identification number,the sample number,date,time, and type of <br /> laboratory analysis required The samples were stored on Ice and transported with a chain-of-custody <br /> record to a state-certified laboratory Groundwater samples were analyzed for BTEX,MTBE, and TPH-G <br /> ' using EPA methods 8021/modified 8015 and for the oxygenates MTBE,TBA, DIPS, ETRE, and TAME <br /> using EPA method 8260 <br /> ' Dissolved oxygen (DO) concentrations were measured In the three wells prior to sampling Dissolved <br /> oxygen readings ranged from 0 7 mg/L to 0 8 mg/L(Table 1) <br /> Quarterly analytical results are summarized In Table 1 and historical results are summarized In Table 2 <br /> Dissolved benzene was not detected In any of the wells Dissolved TPH-G levels ranged between non- <br /> detectable (wells MW-2 and MW-3) and 600 micrograms per liter(ug/L) (well MW-1) Dissolved MTBE <br /> concentrations ranged between 32 ug/L (well MW-2)and 2,500 ug/L(well MW-1) The other oxygenates <br /> were not reported above detection limits In any of the wells sampled The laboratory analytical reports for <br /> the groundwater samples are Included In Attachment 4 <br /> Well Search <br /> ' As mentioned In previous quarterly reports, a well search database for public water supply wells located <br /> within one mile of the site Indicates that the nearest well Is an active municipal well located 1,987 feet <br /> downgradlent 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 /> Purge water generated during this quarterly monitoring and sampling event was stored In 55-gallon <br /> Department of Transportation (DOT) -approved drums pending charactenzation and proper disposal by a <br /> licensed waste hauling company <br /> • <br />