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,I <br /> 17 January 2005 <br /> . AGE-NC Project No 95-0103 <br /> Page 4of9 <br /> a chilled container under cham-of-custody to CTEL for analysis The ground water samples were <br /> analyzed for <br /> • TPH-g In accordance with EPA Method 8015 Modified and <br /> • BTEX and the fuel additives TBA,DIPE,ETBE,TAME and MTBE in accordance with EPA <br /> Method 8260B <br /> I3 0. FINDINGS <br /> From field data collected at the ground water treatment system between 15 December 2003 and <br /> 18 December 2004, AGE calculated the approximate mass and volume of TPH-g and benzene <br /> removed, utilizing the average TPH-g and benzene concentrations and the average ground water <br /> extraction flow rate Ground water flow direction and gradient was determined from the field data <br /> collected on 18 December 2004,the contaminant impact to ground water on 18 December 2004 was <br /> assessed from laboratory data <br /> � . 3 1 GROUND WATER TREATMENT RESULTS <br /> ' Between 15 December 2003 and 18 December 2004, the pump-and-treat system extracted and <br /> treated approximately 771,871 gallons of impacted ground water(Table 4), for a total of 3,481,830 <br /> gallons of water treated since ground water extraction began in April 2002 <br /> 3 1 1 Laboratory Analysis of Influent and Effluent Ground Water Samples <br /> TPH-g compounds and BTEX were detected in the influent samples and ground water extraction <br /> samples collected from wells EW-1, EW-2, EW-3 and VW-6 The following is a summary of the <br /> 'a detected concentrations <br /> • January 2004 Grab ground water samples were collected from the four extraction wells <br /> 1 during pumping Each ground water extraction sample had detectable TPH and BTEX <br /> compounds, the highest TPH and BTEX concentrations were detected in sample EW-3 at <br /> 13,000 micrograms liter (µg/1) TPH-g, 860 µg11 benzene, 47 µg/l toluene, 330 µg/1 <br /> ethylbenzene and 480 µg/1 xylenes In addition, the fuel additive MTBE was detected by <br /> EPA Method 8020 in sample VW-6 at 8 3 µg/1 <br /> • February 2004 Grab ground water samples were collected from the four extraction wells <br /> ' during pumping Each ground water extraction sample had detectable TPH and BTEX <br /> compounds, the highest TPH and BTEX concentrations were detected in sample EW-3 at <br /> ,, Advanced GeoEnvtron mental,Inc <br />