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Since all three tests were sparged at the same rate, and since the aqueous hydrocarbon concentrations were lower after the Ozone and Peroxone tests, this confirms that at a significant portion of the losses in the Ozone and Peroxone tests were due to destruction not volatilization It must be emphasized that the degree of volatilization observed in the Ozone and Peroxone tests in the laboratory is probably higher than would be observed in the field This is because the amount of volatilization is a function of the flowrate used (air- stripping is more effective when the flowrate of the infected air is higher) and because the gas was unconfined in the laboratory test and can easily leave the reactor In the field, the soil above the infection area will restrict transport to the surface In addition, any hydrocarbons that are volatilized in the field may sorb onto soil in the unsaturated zone, where they could later react with ozone in the vapor phase 3.3 Effect of Ozone and Peroxone on Inorganic Parameters The effect of ozone and Peroxone treatment on inorganic water and soil parameters is shown in Table 8 Data for the Nitrogen test are included for comparison Changes that occur in the nitrogen as well as the oxidant tests are most likely due to factors unrelated to the oxidative abilities of oxone or Peroxone For example, the increased liquid to soil ratio in the lab compared to the field could result in new equilibria among dissolved and solid minerals, while sparging with any type of gas can strip carbon dioxide that is normally present in groundwater, causing a decrease in alkalinity and increase in pH 3.3.1 Bromide and Bromate The concentration of bromide decreased in the oxone and Peroxone tests, but not in the Nitrogen test The bromide was not converted to bromate, however, because bromate was not detected above the dectection limit of S pg/L in any case 3.3.2 Other Parameters Most water quality parameters were not significantly affected by nitrogen, ozone or Peroxone when compared to untreated groundwater Exceptions are alummum, arsenic, barium, bromide, manganese, molybdenum, nickel, vanadium, and Cr(VI) Arsenic, manganese and nickel decreased in all cases, bromide deceased in the Ozone and Peroxone tests, and aluminum, barium, molybdenum, vanadium and Cr(VI) increased in most cases The changes in arsenic and molybdenum were similar in all cases, suggesting that they were not due to oxidation In contrast, barium, vanadium, and Cr(VI) changed most significantly only in the Ozone and/or Peroxone tests, implying that the changes were due to oxidation The increase in aluminum occurred in the ratrogen and ozone tests (but not the Peroxone test) for reasons that are unclear The formation of Cr(VI) and the relationship to manganese is discussed in detail in Section 3 4 PRIMA Environmental 15 Eva] of Peroxone June 1,2005 ETIC-Exxon#3942 r