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l <br />' 06 September 2005 <br /> AGE-NC Project No 95-0184 <br />' Page 4 of 5 <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 56 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) -11 <br /> The ground water was inferred to flow generally east across much of the site at a gradient of <br />' approximately 0 003 ft/ft This ground water fl direction is consistent with the last 25 of <br /> 26 monitoring events {Table <br /> - Detectable concentrations of TPH-g were found in all of the ground water wells sampled <br /> Concentrations generally remained stable in wells MW-1 through MW-3, in well <br />' VW-3, and increased in wells MW-4, MW-7, VW-4, VW-5B and VW-5C as compared to <br /> the 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 the DHS' <br /> Maximum Contaminant Levels (MCL) for drinking water <br /> MTBE was detected in samples from wells MW-4, VW-2B, VW-3 and VW-4 at <br /> concentrations rangin from 17 µg/l (VW-3) to 520 lig/1 (VW-4) EDB was detect,94 in <br /> MW-4,-VW-2 VW-5B, �at concentrations ranging from, % 13 d bD-4 SL <br /> (V W-5j to 3�A lig/l {Ib4�74 -aid V W Olig/l <br /> -DCA was d ected ill MW-4, V W- B, d ' UJ <br />' VW-5B at concentrations ranging from (VW-5 to 0 lig/l (VW- <br /> F <br /> concentrations of MTBE, 1,2-DCA, and EDB in the ground water samples exceed their <br />' respective MCLS for drinking water <br /> - Naphthalene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and n-propylbenzene were <br />' detected in ground water samples at concentrations above the DHS-recommended drinking <br /> water Action Levels However, the V OC concentrations have remained stable over the <br /> monitoring period <br />' - The vertical and lateral extent of impacted soil and ground water has not yet been defined <br /> The concentration of dissolved constituents collected in samples from deeper monitoring <br />' wells have been documented to be lower than the shallow, vapor well samples Therefore, <br /> the maximum concentration of the release appears to reside in the upper 50 feet of the <br /> subsurface <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected from the site <br /> Advanced GeoEavaronmentai,Inc <br />