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1 <br />' 24 July 2002 <br /> AGE-NC Project No 01-0827 <br />' Page 5 of 6 <br />' 3 5 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in three of the seven ground water samples, at concentrations ranging from <br />' 69µg/1(VW-5d)to 4,580 pg/l(VW-2d) TPH-d was not detected in the seven ground water samples <br /> collected <br />' BTEX compounds were detected in samples MW-1 and VW-2d at maximum concentrations of <br /> 640µg/1 benzene, 38 7 µg/l toluene, 59 2 µg/1 ethylbenzene and 184 5 pg/l xylenes, respectively, in <br /> the sample from well VW-2d No other ground water samples contained detectable concentrations <br />' of BTEX <br /> MTBE was detected in ground water samples MW-1, VW-2d and VW-5d at a maximum <br /> Iconcentration of 51 6 µg/1 (VW-2d), DIPE was detected in samples VW-2d and VW-5d at a <br /> maximum concentration of 131µg/l (VW-2d), TAME and TBA were detected in sample VW-2d at <br /> concentrations of 61 µg/1 and 88 pg/l,respectively,EDB was detected in sample VW-5d at 2 27 µg/1, <br /> and the chlorinated solvent 1,2-DCA was detected in ground water samples MW-1 and VW-2d at <br /> a maximum concentration of 3 4 µg/1 <br /> The analytical results are summarized in Tables 4 and 5 A copy of the laboratory report (PET Lab <br /> ID 15078-01/07) and chain-of-custody form are included in Appendix D <br /> I <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IBased on the data collected from the site, AGE finds <br /> • Approximately 25 kg or 8 5 gallons of hydrocarbons were extracted by the SVE network at <br /> the site between 18 February and 11 June 2002 The concentrations of hydrocarbons in the <br /> SVE influent has declined below detection limits for two consecutive sampling events, <br /> during normal SVE operation and monitoring However,the SVE should continue operation <br /> during IAS operation <br /> I • Ground water was encountered at a depth of approximately 21 feet bsg, ground water flow <br /> was inferred to be towards the east under a gradient of 0 001 feet/feet <br /> • The maximum concentrations of petroleum hydrocarbon and BTEX compounds in ground <br /> water were detected in the ground water samples collected from the on-site vapor wells <br /> Benzene detected in samples MW-1 and VW-2d were above the DHS' Maximum <br /> Contaminant Level (MCL) of 1 0 µg/1 in drinking water <br /> • MTBE detected in the vapor-well samples were above the DHS' MCL in drinking water <br /> Advanced GeoEnvironmental,Inc <br />