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simulates what could happen as groundwater leaves the treatment zone The results are <br />' shown in Table 6 In this case, 68% of the Cr(VI) was reduced in less than 2 days and <br /> 95%was reduced in about 5 days Since the available reducing capacity of the soil was <br /> not exhausted (only 180 mg Cr(VI) was consumed per kg of soil), it is expected that <br />' further Cr(VI) reduction could occur given sufficient time <br /> Table 6. Concentration of Cr(VI) in Fate of Cr(VI) Test. <br />' Time, Days Cr(VI) Cr(VI) consumed, <br /> Remaining, /L Cr(VI)/k Sal <br /> 0 190 0 <br />' 17 60 130 <br /> 4 7 10 180 <br /> 1 <br /> 3.4 Ozone Demand <br />' The GW ozone demand was estimated to range between 80-90 mg 03/L GW The <br /> concentration of ozone over time is shown in Figure 1 Compared to the Control, the <br />' ozone concentration in the tests using groundwater decreased significantly during the first <br /> 15 minutes After 15 minutes, the change in concentration appears similar Based on the <br /> concentration of BTEX compounds in Untreated GW, the theoretical 03 demand was 64 <br /> mg 03/L of GW This is somewhat lower than the measured ozone demand because <br /> TPH-g cannot be included in the theoretical demand <br /> t 8 <br /> Amount of Groundwater Added <br /> 7 —�Control (none) <br /> 6 -+-26mLGWIL- Rep A <br /> t 26 mL GWlL-Rep B <br /> E <br /> E 5 <br /> os <br /> c <br /> E <br /> m 4 <br /> 3 <br /> O <br /> 2 <br /> 1 <br /> 0 <br /> 0 50 100 150 200 250 300 350 <br /> Time,minutes <br /> Figure 1. Groundwater Oxidant Demand Test. <br /> 1 <br /> PRIMA Environmental 11 Eval of Ozone <br /> January 27,2005 ENSR-Unocal 5098 <br />