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03 July 2003 <br /> AGE-NC Project No 95-0130 <br /> Page 3 of 6 <br /> • 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EBD), tertiary butanol (TBA), di- <br /> isopropyl ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether (TAME) and <br /> MTBE by EPA Method 8260 Modified <br /> 3.0. FINDINGS <br /> IGround water elevation, flow direction and gradient were determined from field data collected on <br /> 04 March 2003, the contaminant Impact to ground water was quantified by laboratory analysis of <br /> water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> I The depths to ground water from the purged wells were measured at between 41 74 and 42 81 feet <br /> below the top of well casings,ground water elevations were calculated to be between 25 99(MW-1) <br /> feet and 26 46(VW-3A)feet below mean sea level(MSL) Generally, ground water elevation at the <br /> site Increased an average 0 79 feet between the December 2002 and the March 2003 ground water <br /> monitoring events Ground water flow direction in the area bound by wells MW-1 through MW-5 <br /> was inferred to be toward the northeast at a gradient of 0 007 ft/ft or less, or approximately 37 feet <br /> per mile The ground water elevation data during the March 2003 ground water monitoring event is <br /> depicted in Figure 3 <br /> 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> A total of nineteen ground water samples were submitted to Castle Analytical Laboratory, a DHS- <br /> certified laboratory, for analysis <br /> TPH-g was detected in water samples collected from wells MW-2, MW-3, MW-5, MW-6 (A-E), <br /> MW-7 (A - E), VW-1 (B and C), VW-2A and VW-3A at concentrations as high as 210,000 <br /> micrograms per liter(gg/1) in the sample collected from VW-1B <br /> I BTEX compounds were detected In all monitoring well samples at concentrations as high as 58,000 <br /> P g p � <br /> µg/l(toluene,V W-1 B) The greatest benzene-impact was detected in groundwater samples collected <br /> Ifrom well MW-7B at a maximum concentration of 44,000 µg/1 <br /> I MTBE was detected by EPA Method 8260 in ground water samples collected from wells MW-2, <br /> MW-3, MW-6 (A-E),MW-7 (A and B),VW-1 (B and C), VW-2A and VW-3A at concentrations <br /> • as high as 71,000 µg/1 (MW-6A) TAME was detected in a water sample collected from well <br /> Advanced GeoEnvironmental,Inc <br />