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' 27 September 2004 AGE-NC Project No 99-0559 ' Page 4 of 5 ' 0 19 May Individual samples were collected from each ground water extraction well influent stream and analyzed The highest concentrations of TPH-g were detected in the sample collected from well EW-2,at 250,000pg/l The highest concentrations of BTEX compounds were detected from wells EW-1, EW-2 and EW-4, with benzene at 49,000 gg/l, toluene at 26,000gg/l, ethylbenzene at 2,3000 pg/l, and xylenes at 23,000 pg/l MTBE concentrations ranged between 3,000 pg/1 (EW-1) and 230,000 pg/l (EW-2) a0 24 June Individual samples were collected from each ground water extraction well influent stream and analyzed The highest concentrations of TPH-g were detected in the sample ' collected from well EW-2,at 260,000µg/1 The highest concentrations of BTEX compounds were detected from wells EW-1 and EW-4, with benzene at 13,000 µg/1, toluene at 19,000µg/1, ethylbenzene at 2,5000 µg/1, and xylenes at 24,000 µg/1 MTBE concentrations ' ranged between 4,100 gg/1 (EW-1) and 81,000 gg/1 (EW-2) None of the contaminants of concern were detected in any of the effluent ground water treatment ' samples Analytical results of pump and treat water samples are summarized in Table 1 CTEL laboratory reports and quality control and quality assurance (QA/QC) reports are provided in Appendix C GeoTracker confirmation pages of the submitted laboratory electronic deliverable ' format (EDF) files are included in Appendix D ' 3 3 MASS-VOLUME REMOVAL CALCULATIONS ' During the first two quarters of 2004,an estimated 282 4 lbs of TPH-g,35 66 lbs of benzene and 148 lbs of MTBE were extracted from ground water Since the initiation of the ground water extraction/treatment system in May 2003,a total of 530 lbs of TPH-g,60 lbs of benzene and 157 lbs ' ofMTBE have been extracted from ground water The 2004 volumetric calculations from the ground water pump-and-treat system are presented in Appendix E ' 4.0. SUMMARY AND CONCLUSIONS Based on the results of ground water remediation activities, AGE concludes the following • Ground water remediation was Initiated at the site in May 2003 Between December 2003 and June 2004, the pump-and-treat system was in operation and processed approximately 3 06,3 42 gallons (1,158,564 liters) of water • Dissolved hydrocarbons were detected in the influent ground water samples collected at • every monitoring event The highest concentration of hydrocarbons detected in the extracted ground water samples occurred in June 2004 at extraction well EW-2 Advanced GeoEnvironmental,Inc