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19 June 2003 <br /> • AGE-NC Protect No 99-0657 <br /> Page 3 of <br /> One or more BTE&X compounds were detected in water samples collected from wells MW 1,MW2 <br /> and MW4 with maximum concentrations of 330 µg/1 benzene, 310 µg/1 toluene, 19 µg/1 <br /> ethylbenzene and 150 µg/1 xylenes in MW-1 <br /> MTBE was detected in water samples collected from wells MW1, MW2, MW4 and MW6 at a <br /> maximum concentration of 670 µg/1 (MW2) TAME was detected in the water samples collected <br /> from well MW2 at a concentration of 4 1 µg/1 <br /> 1,2-DCA was detected in water samples collected from MWI, MW4 and MW6 at a maximum <br /> Iconcentration of 31 µg/1 (MW6) <br /> No other fuel additives were detected at or above laboratory detection limits in the ground water <br /> samples analyzed The analytical results of water samples collected in April 2003 are summarized <br /> on Table 2 The laboratory report (CTEL Lab Project No CT214-0304050), QA/QC report and <br /> chain-of-custody form are Included in Appendix C <br /> lie 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • The ground water elevations ranged from 5 48 to 6 31 feet above MSL Ground water is <br /> inferred to be flowing toward the southwest with an average ground water gradient of <br /> 0 006 feet/feet The ground water elevation at the site remained fairly stable with a nominal <br /> average decrease of 0 04 feet between the January 2002 and April 2003 monitoring events <br /> • The highest concentrations of dissolved hydrocarbons occurred in monitoring wells MW1, <br /> MW4 and MW6,which are located down-gradient of the UST area Iso-concentration maps <br /> depicting the approximate distribution of dissolved TPH-g,benzene and MTBE are presented <br /> in Figures 4, 5 and 6 <br /> I0 Concentrations of dissolved TPH-g, TPH-d, BTE&X and fuel additives have remained <br /> relatively stable Benzene concentrations decreased to non-detectable levels in samples from <br /> l wells MW5 and MW6 The lateral extent of ground water has only been defined to the north, <br /> 1 east and southeast of the UST area The vertical extent of petroleum hydrocarbon-impacted <br /> ground water has not been defined. <br /> • <br /> i <br /> Advanced GcolJnvironmentai,Inc <br /> i <br />