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' 15 February 2006 <br /> . AGE-NC Project No 95-0184 b <br /> Page 5 of 7 <br /> Various BTEX compounds we detected in all ground ter ples analyzed The aximum <br /> concentrations detected were 10,000 µg/l benzene (VW w ), 2200,000 µg11 toluene, 5;000 µg/l <br />' h 6 000 1 total xylenes V W-5B A ma of dissolved benzene concentrations <br /> et ylbenzene,and 30 µg/ y ( ) p � <br />' are Illustrated on Figure 5 <br /> MTBE was detected in samples from wells MW-4, VW-2B, VW-3 and VW-4 at concentrations <br />' ranging from 24 µg/l (VW-3) to 320 µg/l (VW-4) A map of dissolved MTBE concentrations is <br /> shown on Figure 6 r <br />' The lead scavenger 1,2-DCA was detected in MW-1, MW-2, MW-4, VW-2B, VW-3, VW-4, <br /> VW-5B,and VW-5C at concentrations ranging from 2 5 pg/1(MW-7)to 280µg/l(VW-4),EDB was <br /> detected in wells MW-4 and VW-2B at a concentration of 15µg/1 and 16 µg11,respectively A map <br />' of dissolved 1,2-DCA concentrations is shown on Figure 7 <br /> Six additional VOCs were detected at the following maximum concentrations naphthalene at 2,200 <br /> µg/l (VW-2B);"�1,2,4-trimethylbenzene at 5,800 µg/l (VW-3),In-propylbenzene at 370 µg11, <br /> 1,3,5-trimethylbenzene at 1,200 µg/l (VW-3), isopropylbenzene at 130 µg/1 (VW-5B) and <br />' • p-isopropyltoluene at 92 µg11 (VW-5B) <br /> Analytical results of ground water samples are summarized in Tables 2 and 3 Copies of the <br /> laboratory report(CTEL Project No CT214-0512023), quality assurance/quality control (QA/QC) <br /> reports, and chain of custody forms are included in Appendix E Documents confirming the upload <br /> of laboratory electronic deliverable format (EDF) files and depth to water measurements to <br /> GeoTracker are included in Appendix F <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br />' • Ground water elevations in the monitoring wells at the site averaged approximately 23 19 <br /> feet below MSL All ground water wells except VW-3,VW-4,and VW-5B were"drowned", <br /> with water levels as high as 19 feet above the screened Intervals of the drowned wells <br /> (MW-1) <br /> • The ground water was inferred to fl s southeast and east across the former UST areas <br /> at gradients of approximately 0 4 t 007 f/ft This ground water flow direction is <br /> consistent with the previous monitoring events <br />' • Detectable concentrations of TPH-g were found in all of the ground water wells sampled <br /> Concentrations generally increased significantly in the shallow and deeper vapor well <br /> Y" ty Advanced GeoEnvtronmental,Inc <br /> 1 <br />