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' 08 Jul 2004 <br /> • y <br /> AGE-NC Project No 95-0184 <br />' Page 4 of 5 <br />' (VW-5B), 1,3,5 tnmethylbenzene at 1,600 µg/14VW-5B), isopropylbenzene at 130 pg/1 (VW-5B), <br /> and p-isopropyltoluene 27 µg/1 (VW-5B) <br />' Analytical results of ground water samples are summarized on Tables 2 and 3 Copies of the <br /> laboratory report (CTEL Project No CT214-0403100) and chain-of-custody forms are in <br /> Appendix E <br /> 1 � <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' Based upon data collected from the site, AGE concludes the following <br />' • Ground water elevations at the site averaged approximately 23 02 feet below MSL All <br /> ground water wells except VW-3,VW-4 and VW-5B were"drowned",with water levels as <br />' high as 19 feet above the screened Intervals of the drowned wells (MW-1) _ <br /> • The ground water was Inferred to flow generally east-northeast across much of the site at a <br /> gradient of approximately 0 0065 foot/foot This ground water flow direction is consistent <br />' . with the last 21 of 22 monitoring events (Table 4) <br /> • Detectable concentrations of TPH-g were found in all of the ground water wells sampled, <br />' with the exception of well MW-7, generally concentrations increased as compared to the <br /> previous quarter One or more BTEX compounds were found in all ground water samples <br /> collected These samples contained one or more analytes at concentrations above California's <br />' Maximum Contaminant Levels (MCLs) - <br /> • MTBE was detected in samples from wells MW-4, VW-2B, VW-3 and VW-4 at <br />' concentrations ranging from 67 µg/1 (MW-4) to 770 µg/1 (VW-4) A map of MTBE <br /> concentrations is provided in Figure 6,1,2-DCA was detected in MW-2,MW-4 and VW-2B <br /> through VW-5C at concentrations ranging from 6 2 µg/1(MW-2)to 470 gg/1(VW-4),EDB <br />' was detected in MW-4 and VW-2B at a maximum concentration of 140 µg/1 (VW-2B) A <br /> map of 1,2-DCA concentrations is provided in Figure 6 The concentrations of MTBE, 1,2- <br /> DCA and EDB in the ground water samples exceed the MCLs for drinking water <br />' • Napththalene, 1,2,4-tnmethylbenzene, 1,3,5-tnmethylbenzene and n-propylbenzene were <br /> detected in ground water samples at concentrations above_the DHS-recommended drinking <br /> water Action Levels f <br /> IThe vertical and lateral extent of impacted soil and ground water has not yet been defined <br /> I <br /> i - <br /> I ' <br /> Advanced GeoEnvironmental,Inc <br /> I <br />