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' Task 1). Soil will not be analyzed due to the difficulty of sampling soil without losing <br /> significant CDCs to volatilization. A control containing soil and GW, which are not <br /> ' sparged will also be run. The effectiveness of ozonation will be evaluated by comparing <br /> the concentration of COCs in the aqueous and gas phases of the ozone-sparged and <br /> air-sparged test to the initial mass in the control test. <br /> ' Table 3 -Tests to Evaluate Effect of Ozone on COC Removal <br /> Test GW Soil Sparge Gas <br /> ' 1 (control) Yes Yes None <br /> 2 Yes Yes Air <br /> ' 3 Yes Yes Ozone <br /> ' Task 4 - Effect of Ozonation on Secondary Water Quality Parameters <br /> ' Air-sparged and ozone sparged water samples will be collected and analyzed for <br /> alkalinity, chloride, conductivity, Cr(VI), metals (Al, Sb, As, Ba Be, Cd, Ca, Cr, Co, Cu, <br /> Fe, Pb, Mg, Mn, Hg, Mo, Ni, K, Se, Ag, Na, th, W, V, and Zn), nitrate, ORP, pH, sulfate, <br /> and total dissolved solids (TDS). The aqueous phase of a control in which soil and GW <br /> ' are mixed for 6-8 hours without sparging will also be analyzed. <br /> ' Task 5 - Formation and Fate of Cr(VI) or Other Metals <br /> If Cr(VI) or other metals are detected in any of the ozone-sparged tests at <br /> concentrations of concern, then additional testing will be performed to determine <br /> whether the metals can naturally attenuate. Four replicates containing ozone-sparged <br /> ' water impacted with Cr(VI) and or other metals and untreated site soil will be prepared. <br /> Periodically, one replicate will be sacrificed and the aqueous phase analyzed for Cr(VI) <br /> or metals. This test will simulate what could happen once ozonated water leaves the <br /> treatment zone and contacts soil that has not be exposed to ozone. <br />