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LIAM Environmental *AntApplied Sciences and Technology Laboratory Scope for Bench Testing, Exxon #3942 , Stockton, CA The following is Scope of Work to evaluate the ability of ozone and hydrogen peroxide (H2O2) to destroy petroleum hydrocarbons in soil and groundwater at your site. The chemicals of concern(COCs) at this site include diesel range total petroleum hydrocarbons (TPH-d), gasoline range total petroleum hydrocarbons (TPH-g), BTEX compounds, and MTBE. r BACKGROUND Peroxone, a mixture of ozone and hydrogen peroxide, is a strong oxidant that can destroy a wide range of organic compounds, including petroleum hydrocarbons. In principal, compounds may be completely mineralized to carbon dioxide (CO2) and water(H2O). Oxidation is believed to occur via the formation of hydroxyl and other radicals, which are even stronger oxidants than either ozone or H2O2 alone. Because ozone is a gas and H2O2 decomposes to form oxygen gas, in situ treatment via injection of peroxone into the sub-surface could result in removal of volatile compounds by sparging rather than oxidation. Lab testing will therefore address whether contaminant removal is due to destruction or volatilization. ,. Finally,peroxone is a non-selective oxidizing agent that may react with soil and groundwater components in addition to target compounds. The most likely effects would be oxidation of soil chromium to form Cr(VI), mobilization of metals (particularly manganese and arsenic) and precipitation of dissolved iron. Alternatively, peroxone may decrease the concentration of some metals by destroying the organic compounds to which they are bound. Since many metals may be present at a gas station site, it is recommended that effect of peroxone on aqueous metal concentrations be considered during bench testing. Peroxone may also affect the concentrations of oxidizable species such as sulfide. Peroxone is not expected to have a significant effect on pH. The specific goals of this proposed bench-scale testing are • estimate the ozone demand of soil; • estimate the longevity of H2O2in the presence of ozone, confirm removal of CDCs and determine whether removal is due to volatilization or destruction, • measure the effect of peroxone on secondary water quality parameters including pH, and hexavalent chromium, [Cr(VI)]; and b. . if Cr(VI) is formed or other metals are solubilized, determine whether they can naturally attenuate. L 10265 Old Placerville Road,#15,Sacramento,CA 95827-3042 ♦ (916)363-8798 ♦ (916)363-8829 Fax w .primaenvironmentalxom L