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If <br /> 03 April 2006 <br /> AGE-NC Project No 99-0559 <br /> Page 4 of 5 <br /> xylenes MTBE was detected at 10,000 µg/l <br /> TPH-g, TPH-d, BTEX and MTBE were not detected in any of the effluent samples collected <br /> Samples taken on 26 October and 20 December 2005 were also submitted for analysis for all <br /> purgable organics (EPA method 624), all semivolatile organics (EPA method 625), and dissolved <br /> metals Cadmium (Cd), Chromium(Cr), Copper, (Cu), Lead (Pb), Nickel (Ni), and Zinc (Zn) (EPA <br /> method 200 7) The sample from 20 December was also analyzed for fuel oxygenates t-Butyl <br /> Alcohol (TBA), Diisopropyl Ether (DIPE), Ethyl-t-butyl ether (ETRE), t-Amyl Methyl Ether <br /> (TAME), 1,2-Dichloroethane, and 1,2-Dibromoethane (EDB)(EPA method 8260) None of these <br /> constituents were detected in effluent samples at or above laboratory reporting limits <br /> Between 31 December 2005 and 06 January 2006 the unit was offline for service/maintenance <br /> Analytical results of pump-and-treat effluent water samples are summarized in Table 2 CTEL <br /> laboratory reports(CTEL Project Nos CT214-0510111,0510176,0511184,0512156,and 0512157) <br /> with quality assurance/quality control (QA/QC)reports and chain of custody forms are Included in <br /> Appendix B GeoTracker confirmation pages of the submitted laboratory electronic deliverable <br /> format (EDF) files are included in Appendix C <br /> 25 MASS-VOLUME REMOVAL CALCULATIONS <br /> During the fourth quarter of 2005, an estimated 346 lbs of TPH-g, 62 lbs of benzene and 77 lbs of <br /> MTBE were extracted from ground water Since the initiation of the ground water <br /> extraction/treatment system in May 2003, a total of 6,505 Ibs of TPH-g, 263 41bs of benzene and <br /> 493 lbs of MTBE have been extracted from ground water The volumetnc calculations from the <br /> ground water pump-and-treat system are presented in Appendix D <br /> 3.0. SUMMARY AND CONCLUSIONS <br /> Based on data collected during the monitoring event, AGE concludes <br /> • During the fourth quarter 2005, the highest concentrations of petroleum hydrocarbons <br /> detected in the extraction generally occurred at well EW-2,near the discharge of the USTs <br /> The concentrations extracted at wells EW-1 through EW-4 generally increased slightly over <br /> the fourth quarter Well EW-4 exhibited a significant spike in concentrations in November <br /> 2005, which decreased by the December sampling event A trend of each extraction well is <br /> depicted in Appendix D <br /> Advanced GeoEnvironmental,Inc <br />