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kn KLEINFELDER derived from health based criteria, whereas SMCLs are derived from human welfare considerations such as taste and odor. MW-DIS-14s and MW-Dis-15 were the only samples analyzed for MTBE. TBA was detected in MW-DIS-I Is with a concentration of 11 µg/1. This marks the first time TBA has been detected in MW-DIS-11s. TBA was not detected in the other 12 samples. The supplemental groundwater samples collected from MW-DIS-11s, MW-DIS-lld, MW-DIS- 14s, and MW-DIS-14d on September 3, 2003 (prior to the start-up of the ozone system), were analyzed for total iron, ferrous iron, ferric iron, and Redox potential. The results showed only ferric iron in MW-DIS-i 1 s with a concentration of 370 µg/1 and ND results of ferrous iron. The total iron concentration was therefore 370 ug/l.. The Redox potential in MW-DIS-11s was 500 mV. Similarly, only ferric iron was detected in MW-DIS-14s with a concentration of 1,100 µg/1 with no ferrous iron detected and a subsequent total iron concentration of 1,100 µg/l. The Redox potential in MW-DIS-14s.was 520 mV. 1 There were no iron components (ferric or ferrous) detected in MW-DIS IId or MW-DIS-14d. The Redox potentials were 510 mV and 520 mV, respectively. On September 9 and 10, 2003, dissolved ozone and ozone gas were field measured from MW- DS-1ls and MW-DIS-14s. Again, on October 7, 2003, dissolved ozone was measured in MW- DIS-1ld and MW-DIS-14d. The results for dissolved ozone ranged from 0.10 ppm to 0.65 ppm and the ozone gas ranged from non.-detect to 10.40 ppm. The supplemental groundwater samples collected from MW-DIS-11s and MW-DIS-14s on September 9, 2003 following the start up of the ozone sparge system at the site were analyzed for 1 1,2-DCA, TBA, and MTBE. The results showed a decrease in 1,2-DCA concentrations compared to the July 29 to August 1, 2003, sampling event in both wells from 150 µg/1 to 38 µg/1 (July 30 and August 1, 20032, respectively), and from 4.4 µg/1 to 2.0 µg/1 respectively. Additionally; non-detectable concentrations, at or above the laboratory reporting limits, were reported for TBA'and MTBE in both wells. I 12280.MON/ST03RI392 Page 11 of 14 °2003.,Klemfelder,Inc October 13,2003 I