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i r I <br /> I i <br /> I , , <br /> 07 May 2004 , <br /> AGE-NC Project No"03-1100 <br /> Page 3 of 4 <br /> ' I <br />' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> I <br /> TPH-g was detected in ground water samples collected frbmn wells MW-1 through MW-4 at a <br />' maximum concentration of 78,000 µg/1 from MW-2 <br /> MTBE was detected in ground water samples collected from MW-2 at concentration of 120 pg/l <br /> I <br /> BTEX compounds were detected in ground water samples collected from wells MW-1 through <br />' MW-4 at maximum concentrations of 19,000 pg/1 (benzene), 11,000 gg/1 (toluene), 6,000 lig/1 <br /> (ethylbenzene) and 35,000 µg/1 I(total xylenes), respectively <br />' TAME was detected in ground water samples from well MW-2 at a concentration of 66 pg/l 1,2- <br /> DCA was not detected in any of the ground water samples analyzed from the December,2003 <br /> ,sampling event No other constituents of concern were detected in the ground water analyses at or <br />' above laboratory detection limits Figure 4 illustrates the approximate extent of TPH-g impacted <br /> ground water <br /> Analytical results of water samples collected during December 2003 are summarized on Table 2 The <br /> laboratory report (CTEL Lab Project Number 214-0312189), QA/QC report and chain-of-custody <br /> form are included in Appendix B <br /> 4 0 SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes , L, <br />' 0 The ground water elevations on-site ranged from 43 30 to 44 86 feet below MSL Ground <br /> water flow was inferred to be east-southeast under a gradient of 0 009 feet/feet or less <br /> • 1,2-DCA was not detected in the ground water samples collected and analyzed during the <br /> fourth quarter 2003 a <br /> i <br />' 0 TPH-g was detected in samples collected from wells MW-1 through MW-4 at a maximum <br /> concentration of 78,000 gg/1 (MW-2) <br /> • MTBE was detected in samples collected from well MW-2 at a concentration of 120 µg/1 ` <br />' The concentration of MTBE in well MW-2 exceeds the Primary State and Federal <br /> established maximum containment level (MCL) of 13 gg/l for MTBE in drinking water <br />' • ' The lateral extent of TPH-g impacted ground water has been defined to the northwest, west , <br /> and southwest of the former UST area, but not toward the east <br /> r <br />' Advanced GeoEnvironmentai,Inc r <br /> i <br />