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4.0 ENGINEERING CONSIDERATIONS <br /> Laboratory testing confirmed that ozone and Peroxone could destroy hydrocarbons of <br /> concern in groundwater in the presence of site soil Some factors that should be <br /> considered when evaluating these technologies for field application are presented <br /> Volatilization of Hydrocarbons. The presence of some hydrocarbons in off-gases from <br /> the ozone and Peroxone tests was expected It must be emphasized that concentrations in <br /> the field would probably be lower due to Iess stripping, sorption and subsequent <br /> oxidation in the vadose zone, and biodegradation in the vadose and other factors <br /> Formation and Attenuation of Cr(VI) The formation of Cr(VI) from naturally <br /> occurring chromium in soil by ozone and Peroxone was highly erratic In some tests, <br /> very little Cr(VI) was formed, while in others, the concentration of Cr(VI) was very high <br /> The reasons for this are unclear, but probably have to due with the amount or <br /> concentration of applied ozone and/or the presence of manganese in the soil or <br /> groundwater Additional test demonstrated that Cr(VI) could rapidly naturally attenuate <br /> in the presence of untreated soil and indicated that the amount of Cr(VI) that can be <br /> reduced is greater than the amount that can be formed <br /> • Bromide/bromate. Bromate was not detected in any sample The concentration of <br /> bromide decreased in the ozone and Peroxone tests, but the end-product was not bromate <br /> • <br /> PRIMA Environmental 23 Eva]of Peroxone <br /> June 1,2005 FHC-Exxon 43942 <br />