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. First Quarter 2000 Monitoring and Sampling Report 2 <br /> 7-Eleven, Inc ,Store#20632 4627 DaVmci Drive Stockton GA February 2 2000 <br /> ' Monitoring Well Sampling and Analytical Results <br /> ' On February 2, 2000, groundwater samples were collected from four wells (MW-1, MW-2, MW-3 and <br /> MW-5), well MW-4 was abandoned during UST upgrades in 1998 Before sampling, at least 4 well casing <br /> volumes of groundwater was removed from each monitoring well The groundwater samples were <br /> ' collected using disposable bailers Groundwater samples were placed in analysis-specific containers with <br /> analysis-specific preservative The samples were then sealed using Teflon septum caps, labeled with the <br /> job identification number, the sample number, date, time, and type of laboratory analysis required The <br /> ' samples were stored on ice and transported under a chain-of-custody record to a state-certified <br /> laboratory Groundwater samples were analyzed for BTEX and TPH-G using Environmental Protection <br />' Agency (EPA) methods 8021 Blmodified 8015, and for oxygenates MTBE, TBA, DIPS, ETBE, and TAME <br /> using EPA method 8260B <br />' Laboratory analytical results for groundwater samples collected on February 2, 2000 are presented in <br /> Table 1 The laboratory analytical reports for the groundwater samples are included in Attachment 4 <br /> Historical data are included in Table 2 Dissolved benzene was detected only in well MW-5 at <br /> 29 6 micrograms per liter(pg/L), dissolved TPH-G at 3,490 pg/L and dissolved MTBE concentrations <br /> were highest in well MW-2 at 2,010 pg/L and 407 erg/L, respectively Dissolved MTBE concentrations <br /> versus water table elevations are plotted on Figures 3 and 4 <br /> Observed concentrations and hydrocarbon distribution are similar to previous quarters There are no <br />' private or public municipal or domestic wells within 2,000 feet of the site <br /> Dissolved oxygen levels, measured near 1 milligram per liter(mg/L), due to intrinsic biodegradation <br /> Purge Water Transportation and Disposal <br /> ' All purge water generated during this quarterly monitoring and sampling event was stored in 55-gallon <br /> Department of Transportation (DOT)-approved drums pending characterization and proper disposal <br /> ' Waste disposal documentation will be forwarded once received <br /> ' IT CORPORATION <br /> 20632Q 10 ItPT <br />