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SNS <br /> 5.0 CONCLUSIO <br />' Sparging with ozone and nitrogen effectively removed COCs from groundwater <br /> Although up to 96% of each COC was accounted for in the off-gases from the Nitrogen <br /> test, only 0 6-3% were accounted for in the Ozone test, indicating that losses in the Ozone <br /> 1 test were due to destruction, not volatilization The appearance of acetone in the Ozone <br /> test further supports destruction of COCs <br /> Ozone did not have a large effect on most secondary water quality parameters <br /> Exceptions are alkalinity, bromate, calcium, Cr(VI), magnesium, nitrate and pH <br />' Alkalinity, calcium, magnesium, and pH changed as would be expected by air-stripping <br /> Bromate, Cr(VI), and nitrate increased <br />' Measurement of the available Cr(VI) reducing capacity of untreated soil indicated that <br /> untreated soil can reduce > 65,000 µg Cr/kg soil A laboratory test simulating the fate of <br /> Cr(VI) in groundwater leaving the treatment zone indicated that such Cr(VI) could <br />' naturally attenuate <br /> The ozone demand of soil was 450-750 mg 03/kg soil, while the ozone demand of GW <br />' was 80-90 mg 03/L GW These values yielded a good approximation of the amount of <br /> ozone required to remove most of the CDCs from a soil-water mixture <br /> i <br /> Ozonation increased the TSS of groundwater by 10 mg/L This concentration was too low <br /> to obtain the particle size distribution <br /> I <br /> I <br /> l 5 Eval of Ozone <br /> PRIMA Environmental <br /> January 27,20D5 ENSR-Unocal 5098 <br />' <br />