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1117 Lone Palm Avenue, Suite 201 <br /> Modesto, <br /> V California 1 <br /> 29- 79-2221 <br /> Fax: 209-579-2225 <br /> ASSOCIATES INC . <br /> non-selective oxidizing agent and may react with soil and water constituents other than the target <br /> compounds. The most likely potential effects of ozone when applied into the subsurface include <br /> oxidation and precipitation of dissolved iron, oxidation and dissolution of manganese oxides, oxidation of <br /> naturally-occurring bromide to bromate, oxidation of soil chromium to hexavalent chromium [Cr(VI)] <br /> and oxidation of reduced nitrogen species to form nitrate. The magnitude of these changes is site specific <br /> and may or may not be of significance. <br /> Approach <br /> Batch tests will be conducted to evaluate each of the technologies. Specific goals are : <br /> assess petroleum hydrocarbon and fuel oxygenates destruction versus volatilization by ozone <br /> evaluate the effect of ozone on secondary water quality parameters <br /> • measure soil oxidant demand for ozone <br /> if necessary, assess the potential for natural attenuation of Cr(VI) <br /> Specific tests to achieve these goals are presented in the Scope of Work. PRIMA Environmental, Inc. <br /> (PRIMA) will evaluate the effectiveness of ozone by conducting the bench scale tests. <br /> Scope of Work <br /> Task 1 - Soil and Groundwater Preparation and Characterization <br /> Soil and groundwater samples will be collected by ATC field personnel during the installation of pilot <br /> test wells and utilized for the ozone bench scale test. Select samples will be transported to PRIMA <br /> Environmental, Inc. in Sacramento for the bench scale test evaluation. Prior to analytical testing, soil will <br /> be sieved by PRIMA to remove particles greater than a 44 mesh size and then homogenized. <br /> Homogenized soil will be analyzed for TPHg, BTEX, and select oxygenates including 1 ,2-DCA . <br /> Additionally, the soil and groundwater samples will be analyzed for elemental hexavalent chromium <br /> [Cr(VI)] and total chromium. <br /> Composited soil samples from the site will be analyzed for TPHg, BTEX, select fuel oxygenates <br /> including 1 ,2-DCA, dissolved chromium, the anion bromate, the ion bromite, and elemental hexavalent <br /> chromium [Cr(VI)j . <br /> Groundwater samples will be analyzed for TPHg, BTEX, and select fuel oxygenates including 1 ,2-DCA. <br /> Additionally, dissolved chromium, the anion bromate, the ion bromite; elemental hexavalent chromium <br /> [Cr(VI)] , ORP measurements and pH analyses will be conducted. <br /> Task 2 - Ozone Demand <br /> The ozone demand of soil and groundwater will be estimated by adding a small amount of either material <br /> to ozone-saturated water, then measuring the concentration of ozone over time using the indigo method <br /> (SW 4500-03). A control in which no soil or groundwater is added wilt also be performed. Each test will <br /> be conducted in duplicate. The ozone demand will be calculated as the difference in ozone consumption <br /> in the presence and absence of site material. <br /> Workplan for reasibilityStudies — Fomer Stmkton Taxi Company ATC Associates Inc. <br /> s:..A28349\ WP for Pilot Testing and SCAM ATC Project No. 54.28349.0001 <br /> 10 <br />