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• 2.5.1 Available Cr(VI) Reducing Capacity of Soil (Bartlett Method) <br />' The available reducing Cr(VI)reducing capacity of soil was measured to estimate the <br /> amount of Cr(VI) that could be reduced by untreated soil in the event that Cr(VI) is <br />' generated during ozonation Two vials containing 5 g of soil and 25 mL of 10 mM <br /> H3PO4 spiked with Cr(VI) were prepared The initial Cr(VI) concentration in one of the <br /> vials was 0 1 mmoles/L (5 2 mg/L), the concentration in the other was 0 25 mmoles/L (13 <br /> mg/L) The vials were capped and shaken on a shaker table After 18 hours, the aqueous <br /> phase was analyzed for Cr(VI) <br /> 2.5.2 Fate of Cr(VI) <br /> To evaluate whether Cr(VI)in site GW leaving the treatment zone could be reduced upon <br /> exposure to untreated soil, four bottles containing 75 g untreated site soil and 75 mL of <br /> ozonated GW spiked with Cr(VI) were prepared The bottles were capped and placed on <br /> a shaker table Periodically, one bottle was sampled and the aqueous phase analyzed for <br /> Cr(VI) (The ozonated GW was prepared by spiking IL of GW to 200 µg/L Cr(VI), then <br /> sparging GW and 100 g of soil for about 2 hours under conditions similar to those <br /> described in Section 2 3 ) <br /> 2.5 Effect of Treatment on TSS and Particle Size <br /> 10 Groundwater only was sparged with ozone for approximately 1 hour This turned the <br /> water cloudy orangish brown (due to the oxidation of iron) Total suspended solids (TSS) <br /> and particle size distribution were measured for treated and untreated GW <br /> 2.7 Analytical Procedures <br /> IThe analytical methods used during this study, as well as the lab performing the test, as <br /> given in Table 1 <br /> I <br /> PRIMA Environmental 5 Eval of Ozone <br /> January 27,2005 EN51t-Unocal 5098 <br />