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5.0 CONCLUSIONS <br /> Laboratory testing demonstrated that both Fe(H) and Cascade could decrease the i <br /> concentration of Cr(VI) in groundwater in the presence and absence of soil Soil <br /> decreased the efficiency of each treatment, but complete removal was still achieved with <br /> the higher dose of Fe(II) and could probably be achieved with Cascade if a higher dose <br /> were employed <br />�1 Treatment with Fe(II) solution affected more secondary water quality parameters than did <br /> treatment with Cascade° Specifically, Fe(II) affected pH, dissolve iron, dissolved <br /> manganese, sulfate, conductivity and TDS Cascade® affected manganese The <br /> magnitude of the changes may be different in the field than in the laboratory due to <br /> difference in soil to liquid ratio and other factors Neither treatment affected ammonia, <br /> nitrate, arsenic, copper or zinc, and neither generated methane <br /> The amount of acid needed to decrease the pH of site tap water to pH 3 (in order to <br /> prepare Fe(II) solution) is about 300 mL 98% H,SO4/1000 gallons of water <br /> Site soil can neutralize about 100 mmoles H+/kg soil and about 10 mmoles OH-/kg soil <br /> Acid must be neutralized if Fe(II) is used, while base must be neutralized if Cascade® is <br /> used <br />' PRIMA Environmental 16 Eval of Reductants <br /> January 19,2005 ATC-Diamond Walnut <br />