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• <br /> 12 June 2003 <br /> AGE-NC Project No 01-0827 <br /> Page 6 of 7 <br /> I3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water samples from wells MW-1, MW-6 and VW-2d at <br /> concentrations of 87 pg/l, 950 pg/l and 5,000 lcg/l, TPH-d was detected in samples MW-1,MW-5 <br /> and vapor wells VW-1 and VW-2d at a maximum concentration of 3,900 µg/1 (VW-2d) <br /> Various BTEX compounds were detected in samples MW-1,MW-6,VW-1 and VW-2d at maximum <br /> concentrations of 590µg11 benzene, 16 pg/l toluene, 29 µg/1 ethylbenzene and 140 pg/l xylenes, in <br /> sample VW-2d <br /> The fuel additive MTBE was detected in ground water samples MW-1, VW-2d, VW-5d at <br /> I concentrations of 0 93 µg11, 86µg/1 and 4 7 µg/1, respectively In addition, the chlorinated solvent <br /> 1,2-DCA was detected in two ground water sample at a maximum concentration of 3 4 pg/l(MW-1) <br />' The analytical results are summarized in Tables 4 and 5 A copy of the laboratory report(MAI Lab <br /> ID 0304378 and CTEL Project No 214-0304149) and chain-of-custody form are included in <br /> • Appendix D II <br /> 4 0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE finds <br /> • On 23 and 24 April 2003,ground water was encountered at a depth of approximately 22 feet <br /> btoc Ground water flow was inferred to be towards the northeast under a gradient of <br /> 0 005 ft/ft Except for wells VW-1 and VW-3, all site wells are "drowned" and analytical <br /> I data from these wells may not be representative of shallow-water conditions, analytical data <br /> from monitoring well MW-6, screened from 60 to 65 feet bsg, may be representative of <br /> deeper ground water conditions <br /> I • The maximum concentrations of petroleum hydrocarbon and BTEX compounds in ground <br /> water were detected in the ground water sample collected from on-site vapor well VW-2d <br />' • The concentrations of MTBE and 1,2-DCA in samples VW-1, VW-2d and MW-1 were <br /> above the DHS's Primary Maximum Contaminant Levels (MCL) of 13 pg/l and 0 5 gg/1, <br /> respectively, for these chemicals in drinking water <br /> I <br /> Advanced GeoEnvlronmental,Inc <br /> I <br />