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31 August 2005 <br /> AGE-NC Project No 95-0109 <br />' Page 3 of 4 <br /> fluctuated between-243 5 millivolts (mV) in well MW-2 and 212 4 mV in well MW-5 Dissolved <br /> Oxygen measurements ranged from 0 32 mg/1 in well MW-1 to 10 53 mg/l in well MW-9 ORP and <br /> DO measurements are provided in Table I <br /> r <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g, TPH-d and BTEX were not detected in ground water sample collected from wells MW-1 <br /> through MW-10 during the November 2004, February 2005 and May 2005 sampling events <br /> MTBE was detected in November 2004 and February 2005 in samples collected from wells MW-1, <br /> MW-2, MW-4 through MW-6, MW-9 and MW-10, the maximum MTBE concentration of 2,000 <br />' micrograms per liter (µg/l) was detected in the November 2004 sample collected from MW-5 <br /> MTBE was not detected in the ground water samples collected from wells MW-1 through MW-10 <br /> during the May 2005 sampling event,the May 2005 sampling event is the first time since sampling <br />' began at the site that MTBE was not detected in wells MW-4 and MW-5 Analytical results of <br /> MTBE from August 2004 to May 2005 are included in Table 2 Analytical results of historical <br /> ground water samples are presented in Table 3 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br />' ORP measurements ranged between-243 5 millivolts(mV)in well MW-2 and 212 4 mV in <br /> well MW-5 during monthly monitoring events conducted between August 2004 and May <br />' 2005 No distinct oxidation trends were observed(Figure 3), because the ozone system was <br /> not operational between October 2004 and February 2005 <br /> • Dissolved Oxygen measurements ranged from 0 32 mg/I in well MW-1 to 10 53 mg/1 in well <br />' MW-9 No distinct DO trends were observed (Figure 4), because the ozone system was not <br /> operational between October 2004 and February 2005 <br /> • Concentrations of MTBE in ground water samples collected from wells MW-1 through <br /> MW-10 between August 2004 and May 2005 have decreased to non detect Dissolved MTBE <br /> concentrations have been declining slowly over time,but the May 2005 sampling event was <br /> the first time that MTBE was not detected in samples collected from wells MW-4 and <br /> MW-5 Graphs illustrating concentrations of MTBE over time in wells MW-1 and MW-10 <br /> are presented in Appendix A <br /> Advanced GeoEnvironmental,Inc <br />