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Mr Michael Infurna <br /> Page 2 <br /> Samples were collected after parameter stabilization, and appropriate water level recovery Purge <br /> water was contained in properly labeled DOT-approved 55-gallon drums The drums are currently <br /> being stored onsite Purge logs are included in Attachment A <br /> Groundwater samples were delivered under chain of custody protocol to Argon Laboratories (FLAP <br /> #2359) Analysis consisted of TPHg and TPHd using modified EPA Method 8015M, gasoline <br /> oxygenate additives, ethylenedibromide (EDB) and 1,2-dichloroethane (1,2-DCA) using EPA <br /> Method 8260B, and BTEX using EPA Method 8021B <br /> Groundwater Analytical Results <br /> EDB and 1,2-DCA were not detected in any site well BTEX, TPHg, TPHd and gasoline <br /> oxygenates were not detected in wells MWI, MW2, MW4 and MW5 <br /> In well MW3, BTEX compounds were not present, but TPHg was detected at a concentration of 510 <br /> parts per billion (ppb) TPHd was detected at a concentration of 1,300 ppb Methyl-tert-butyl ether <br /> (MTBE) was detected at a concentration of 1,400 ppb Analytical results are summarized in Table <br /> 2 Attachment B contains laboratory reports and chain of custody documentation Graphs of TPHg, <br /> TPHd and MTBE concentrations over time in MW3 are included in Attachment C <br /> Summary <br /> • o Groundwater levels at the site fell since the previous round of sampling The groundwater <br /> gradient across the site ranged from approximately 0 005 — 0 007ft/ft Groundwater flowed <br /> predominantly in a westerly direction <br /> o EDB and 1,2-DCA were not present above laboratory method detection limits (MDLs) in any <br /> site well Gasoline oxygenates, TPHg, BTEX, and TPHd concentrations were less than MDLs <br /> in wells MW1, MW2, MW4 and MW5 <br /> • In monitoring well MW3, the concentrations of TPHg, TPHd, and MTBE were similar to the <br /> previous event <br /> Conclusions <br /> Dissolved contaminants in groundwater at the site consist primarily of TPHd and MTBE BTEX <br /> compounds are absent or present only at trace levels The contaminant plume is localized in the <br /> immediate vicinity of well MW3, and is of very limited extent Although concentrations spikes occur <br /> from time to time, the cumulative data indicate that the plume is not migrating, and dissolved <br /> contaminant concentrations are stable to decreasing <br /> G IGROUNDZOWOOLSEY CHnQMR1200514QM2005 doe <br />