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' EXECUTIVE SUMMARY <br /> Bench scale laboratory testing was performed to evaluate the ability of ozone (03) to <br /> tdestroy chemicals of concern (CDCs) in soil (MW-31 and MW-32) and groundwater <br /> (MW-3) from the Unocal 45098 site in Stockton, California The COCs at this site were <br /> gasoline range total petroleum hydrocarbons (TPH-g), BTEX compounds (benzene, <br />' toluene, ethylbenzene, and xylenes), and MTBE <br /> Sparging with ozone and nitrogen effectively removed CDCs 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 /> 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 03/1, GW These values yielded a good approximation of the amount of <br /> ozone required to remove most of the COCs from a soil-water mixture <br /> Ozonation increased the TSS of groundwater by 10 mg/L This concentration was too low <br /> Ito obtain the particle size distribution <br /> PRIMA Environmental i Eva[ of Ozone <br /> January 27 2005 <br /> ENSR-Unocal 2998 <br />