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15 April 2006 AGE-NC Project No 95-0142 Page 4 of 5 • On 15 March 2006 Samples were collected from VW-1 only, EW-1 was not operational - pump motor replacement) TPH-g was detected in influent sample VW-1 at 25,000µg/l BTEX compounds were detected at 3,600 gg/l benzene, 4,200 µg11 toluene, 490 µg11 ethylbenzene and 2,200 µg/l xylenes MTBE was detected in VW-1 at 10 µg/1 Analytical results of pump-and-treat water samples are summarized in Table 2 The laboratory reports (MAI Work Orders 0510260, 0511334, 0512244, 0601215, 0602277, 0603281) QA/QC reports and chain of custody forms are included in Appendix B i 2 3 2 Laboratory Results of Effluent Ground Water Samples • TPI-1-g/-d, BTEX compounds and MTBE were not detected in the effluent ground water treatment samples analyzed Analytical results of pump-and-treat water samples are summarized in Table 2 The laboratory reports (MAI Work Orders 0510260, 0511334, 0512244, 0601215, 0602277, 0603281) QA/QC reports and chain of custody forms are included in Appendix B 2 4 GROUND WATER MASS-VOLUME REMOVAL CALCULATIONS During the fourth quarter 2005 and the first quarter 2006, an estimated 100 9 lbs of TPH-g and 13 3 lbs of benzene were extracted from the ground water The fourth quarter 2005 and first quarter 2006 volume to mass to weight calculations from the ground water pump-and-treat system are presented in Appendix D The results of the laboratory analyses are summarized in Table 2 25 GEOTRACKER CONFIRMATIONS GeoTracker confirmation pages of the submitted Laboratory electronic deliverable format(EDF)files and ground water data are included in Appendix C 3.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE concludes • Results from previous assessment investigations indicated that the highest concentrations of petroleum hydrocarbons in soil and ground water (VW-1) were near the former UST area Advanced GcoEnvironmcntal,Inc