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also be required The evaluation of both active and passive in situ bioremediation ' is presented on Table 6 6.1.2.3 Ultraviolet/Oxidation. Forms of ultraviolet/oxidation treatment can be ' performed either on extracted groundwater or in situ The technology is based on degradation of the contaminants by chemical reaction with hydrogen peroxide and ' ozone Ultraviolet/oxidation has been used successfully on petroleum hydrocarbon contaminated groundwater There are several proprietary ultraviolet/oxidation systems available on the market Treatment of extracted water is accomplished by passing the water through a treatment unit in which hydrogen peroxide and ozone are introduced The treatment unit may also expose the water to ultraviolet light which enhances the oxidation of the contaminants and increases the reaction rate Catalysts may be required to fully oxidize the contaminants These catalysts are typically ' proprietary and facilitate the decomposition of hydrogen peroxide to highly reactive singlet oxygen species that readily react with saturated alkanes present in gasoline ' The evaluation of this technology is presented on Table 5 In situ treatment is accomplished by introducing hydrogen peroxide to groundwater through an infection well Hydrogen peroxide oxidizes the contaminants to form carbon dioxide and water Hydrogen peroxide alone may not be sufficient to fully degrade the contaminants, so catalysts may be required The addition of low ' levels of hydrogen peroxide to the groundwater will induce bioremediation This application is presented in the bioremediation discussion in Section 6 12 2 The ' introduction of high levels of hydrogen peroxide may destroy naturally occurring bacteria and could cause the plume to spread Oxidation may cause volatilization of the BTEX compounds that could potentially contaminate the vadose zone unless an ' extraction system is provided A pilot study may be required to determine the effectiveness of oxidation at the site The evaluation of this technology is presented ' on Table 6 6.1.2.4 Volatilization. Volatilization treats the groundwater by introducing a gas ' (typically air) to the groundwater and inducing volatilization of contaminants Treatment is most successful on highly volatile contaminants Treatment of extracted ' groundwater is typically accomplished by air stripping A standard air stripping system consists of a packed tower in which water is infected near the top and allowed to cascade over the packing material while air is introduced near the bottom and bubbled through the material The packing material provides a large surface area ' 93R22 East Bay Municipal Utility District 40429500 aea 15 Stockton Svc Ctr -Site Assessment/Remedial Options 1