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23 April 2003 AGE-NC Project No 95-0130 Page 3 of 6 ' 3.0 FINDINGS Ground water elevation,flow direction and gradient were determined from field data collected on 04 ' December 2002,the contaminant impact to ground water was quantified by laboratory analysis of water samples ' 3 1 GROUND WATER ELEVATION AND GRADIENT ' The depths to ground water from the purged wells were measured at between 42 54 and 43 67 feet below the top ofwell casings,groundwater elevation was calculated to be between 26 62(MW-6A)feet and ' 27 31 (MW-3)feet below mean sea level Generally,ground water elevation at the site decreased an average 124 feet between the September 2002 and the December 2002 ground water monitoring events Ground water flow direction in the area bound bywells MW-1 through MW-5 was inferred to be toward ' the northeast at a gradient of 0 005 f1/f1 or less The ground water elevation data during the December 2002 ground water monitoring event is depicted in Figure 3 ' ie 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES ' A total of eighteen ground water samples were submitted to Castle Analytical Laboratory,a DHS-certified laboratory, for analysis ITPH-g was detected in water samples collected from wells MW-2,MW-3,MW-5,MW-6(A-E),MW- 7(A-E),VW-1 C,VW-2A and VW-3A at concentrations as high as 200,000 micrograms per liter(u g/1) in the sample collected from VW-1C BTEX compounds were detected in the same wells at concentrations as high as 53,000#g/l(toluene, VW-1Q The greatest benzene-impact was detected in groundwater samples collected from well MW-7B at a maximum concentration of 40,000 yg/1 IMTBE was detected by EPA Method 8260 in ground water samples collected from wells MW-2,MW-3, MW-6(A-E),MW-7(A-C),VW-I C,VW-2A and VW-3A at concentrations as high as 55,000,ug/l I (MW-6A) TBA and DIRE were detected in the ground water sample collected from well MW-3at concentrations of 120,ug/I and 1 yg/l,respectively TAME was detected in water sample VW-3A at a concentration of 1 l ,u g/l 1,2-DCA was detected in groundwater samples collected from wells MW-3, MW-6C,MW-7(A-C),VW-1C,VW-2A and VW-3A at concentrations as high as 180,ug/l(VW-2A) • IAdvanced GeoEnvirenmental,Inc