SITE INFORMATION AND CORRESPONDENCE FILE 2

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I"001 PRIMA Environmental, Inc. channs/2 of Confidential December 9,2007 Secor—Circle K rfp 1503+C5H120 5CO2+ 1502+6H2O Eqn. 4 MTBE 1203+C4Ht00 4CO2+ 1202+5H2O Eqn. 5 TB. Table 1. Ozone Stoichiometry Compound e Ozone!e contaminant Benzene 9.2 Toluene 9.5 Eth Ibenzene 9.5 Xylenes 9.5 MTBE 8.2 TBA 8.5 Because ozone is a gas,sparging with ozone could result in removal of contaminants by stripping rather than oxidation, especially under laboratory conditions. Lab testing will, therefore, address contaminant destruction versus volatilization. As with all strong oxidants, ozone is a non-selective oxidizing agent and may react with soil and water constituents other than the target compounds. The most likely potential effects of ozone treatment include oxidation and precipitation of dissolved iron, oxidation and dissolution of manganese oxides, oxidation of naturally-occurring bromide to bromate, and oxidation of soil chromium to hexavalent chromium, Cr(VI). The magnitude and duration of these changes is site specific and may or may not be of significance at this site. APPROACH Batch tests will be conducted to evaluate ozone. Specific goals are: • measure the ozone demand of soil and groundwater • evaluate COC removal and assess destruction versus volatilization • evaluate the effect of ozone treatment on secondary water quality parameters • if necessary, assess the potential for natural attenuation of Cr(VI) Specific tests to achieve these goals are presented in the Scope of Work. PRIMA Environmental will evaluate the effectiveness of each oxidant based on the results of the bench tests and will present findings in a report to SECOR. The report will include results as well as observations and discussion. However, it is the responsibility of SECOR to review the report and use its knowledge and expertise to determine whether ozone should be applied at the site.