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treated groundwater to untreated soil, and testing the groundwater over time to document this reduction. A detailed work plan for the oxidant injection benchscale study, provided by PRIMA, is presented in Appendix B. The water quality objectives, maximum contaminant levels, and laboratory detection limits are presented in Table 2. 2.2 OXIDANT INJECTION PILOT TESTS The proposed oxidant injection pilot tests will be performed only if the benchscale study indicates that this technology can address the hydrocarbon-impacted without degrading groundwater quality and only with regulatory approval and the necessary permits. The oxidant injection pilot tests will consist of the tests listed below. These tests, which will be conducted using ozone and hydrogen peroxide, are: • Ozone sparging radius of influence test • Liquid injection test r • Liquid radius of influence test • Vertical mixing The ozone sparging radius of influence test will be conducted to assess how ozone can be distributed in the subsurface. The liquid injection test will be conducted to determine the rate at which a liquid oxidant (hydrogen peroxide) can be introduced into the saturated zone. The liquid radius of influence test will be conducted to assess how hydrogen peroxide will be distributed in the subsurface. The vertical mixing test will be conducted on a pair of the stainless steel injection points to provide information regarding the vertical mixing of a liquid and gas injected into the subsurface at different depths. 3. REPORTING AND SCHEDULE ETIC anticipates completing the benchscale study in 2004, pending approval from the SJCEHD. A report of the benchscale study findings will be submitted to the SJCEHD within 90 days of the completion of the work and will, if appropriate, include details concerning the proposed oxidant injection pilot tests. GT"ws\73942NASi \N' l2texO.dm 3