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' 21 November 2005 <br /> AGE-NC Project No 96-0263 <br /> Page 3 of 4 <br />' 3 1 REDOX POTENTIAL AND DISSOLVED OXYGEN MEASUREMENTS <br /> Based on eight monthly monitoring events between August 2004 and May 2005,ORP measurements <br />' fluctuated between -24 4 millivolts (mV) in well MW-7 and 176 0 mV in well MW-10 Dissolved <br /> Oxygen measurements ranged from 0 17 mg/l in well MW-4 to 5 44 mg/l in well MW-6 ORP and <br /> DO measurements are provided in Table 1 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g, BTEX and MTBE were detected in ground water sample collected from wells MW-1, <br /> MW-2,MW-4,MW-5 and MW-7 during the June 2004,August 2004 and November 2005 sampling <br /> events TPH-g was detected in the samples collected from wells MW-2 and MW-7 during the March <br /> 2005 sampling event,and MTBE was detected in wells MW-2,MW-3 and MW-7 during the March <br /> 2005 sampling event No analytes were detected from well MW-5 during the March 2005 sampling <br />' event <br /> . TPH-g and MTBE were detected at maximum concentrations of 44,000 micrograms per liter(µg/1) <br /> and 43,000µg/1, respectively in the samples collected from well MW-7 during the August 2004 <br /> sampling event Analytical results of MTBE from June 2004 to March 2005 are included in Table 2 <br />' Analytical results of historical 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-24 4 millivolts(mV)in well MW-7 and 176 mV in well <br /> MW-10 during monthly monitoring events conducted between June 2004 and March 2005 <br /> No distinct oxidation trends were observed (Figure 3), because the ozone system did not <br /> operate continuously between June 2004 and December 2004 <br /> • Dissolved Oxygen measurements ranged from 0 17 mg/l in well MW-4 to 5 44 mg/1 in well <br /> MW-6 No distinct DO trends were observed (Figure 4), because the ozone system did not <br /> operate continuously between June 2004 and December 2004 <br /> • Concentrations of TPH-g and BTEX compounds have decreased over the past nine months <br /> in wells MW-2,MW-4,MW-5 and MW-7 TPH-g and benzene have decreased to non detect <br /> in wells MW-4 an MW-5 <br /> Advanced GeoEnv=ronmental,Inc <br /> I <br />