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Because ozone is a gas, in situ treatment of chemicals of concern (COCs) via injection of <br /> ozone into the sub-surface could result in removal of COCs by spargmg rather than by <br /> oxidation Lab testing to evaluate contaminant destruction versus volatilization was, <br /> therefore, performed <br />' Ozone will react with dissolved metals such as iron to form insoluble hydroxides and <br /> oxides Reaction with dissolved manganese can form insoluble manganese dioxide <br />' (Mn02) or water-soluble permanganate (which would probably be reduced to Mn02 upon <br /> exposure to untreated soil) Although the amount of dissolved metals in groundwater is <br />' usually relatively low, precipitated solids could potentially affect the permeability of an <br /> aquifer <br /> Ozone (or by-products such as Mn02) could also potentially oxidize soil-bound <br /> chromium to water-soluble hexavalent chromium [Cr(VI)J In other studies conducted by <br /> PRIMA Environmental, Cr(VI) generated during in situ treatment can sometimes <br />' naturally attenuate in the presence of untreated soil, but this is site-specific <br /> The specific goals of the bench-scale testing were to <br /> i • determine whether ozonation of site materials could remove CDCs, <br /> • determine whether removal is due to destruction and or volatilization, <br />' • determine whether oxidation by-products such as acetone or TBA are formed, <br /> • estimate the ozone demand of soil and water, <br /> • determine the effect of ozonation on secondary groundwater parameters, and <br /> assess the potential formation and fate of Cr(VI), <br /> PRIMA Environmental 2 Eva[of Ozone <br /> January 27 2005 ENSR-Unocal 5098 <br />