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20 December 2001 <br /> AGE-NC Project No 01-0827 <br /> Page 7of8 <br />' ground water elevations at the site ranged from 11 91 feet to 12 21 feet below mean sea level(MSL) <br /> The ground water flow ranges from northwest to northeast (Figure 3) The hydraulic gradient in the <br /> Former UST area was calculated 0 001 directed toward the east to northeast <br /> 3 6 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-a was detected in three of the sevenound water samples, at concentrations ranging from <br /> �' p � � g <br /> 126 4g/1 in sample MW-I to 5,100 µg/l in samples VW-2d TPH-d was not detected in the seven <br />' ground water samples collected <br /> I Benzene was detected in the same sample with TPH-g detections at concentrations of 43 µg/l, 960 <br /> µg/l and 18µg/1(MW-1,VW-2d and VW-5d) Toluene and ethylbenzene,detected only in the sample <br /> from well VW-2d, had concentrations of 170 µg/l and 188 µg/1, respectfully Total xylenes were <br /> reported in samples from well VW-2d and VW-5d at concentrations of 354 gg/l, and 1 5 µg11, <br /> respectively No other ground water samples contained detectable concentrations of BTEX <br /> MTBE was detected in ground water samples MW-1, VW-2d and VW-5d at concentrations of <br /> lb 9 6 µg/l, 584g11 and 48 µ.g11, respectively TAME was detected in the sample from well VW-2d at <br /> a concentration of 49 µg/1 TBA was detected in the sample from well VW-5d.at a concentration of <br /> 49 µg/l 1,2-DCA was detected in ground water samples MW-1, VW-2d and VW-5d at <br /> concentrations of 0 53 µg11, 0 6µg/l and 4 0 gg/l, respectively <br /> The analytical results are summarized in Tables 4 and 6 A copy of the laboratory report (PET Lab <br /> ID 13190-01 to-07) and chain-of-custody form are included in Appendix F <br /> E4 4 SUMMARY AND CONCLUSIONS <br /> Based on the data collected from. the site, AGE finds <br /> • Ground water was encountered in the monitoring wells at approximately 19 feet bsg <br /> • The maximum hydrocarbon concentrations in ground water were detected in the vapor wells <br /> on site and the maximum concentration ofBTEX compounds were also detected in samples <br /> collected from the vapor wells on site MTBE was detected in the three samples <br /> • The fuel additive 1,2-DCA was detected at low concentrations in the samples collected from <br /> lie the wells on site <br /> • Approximately 13 gallons(38 kg)of hydrocarbons were extracted and destroyed by the SVE <br /> network at the site between 11 October and 15 November 2001 <br /> Advanced GcoEnvironmental,Inc <br />