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chromium are approached during flushing, the incremental concentration <br /> change per pore volume treated will become smaller. Therefore, a greater <br /> number of pore volumes of water will be required as contaminant <br /> concentrations within the remediation zone decrease and approach a <br /> condition similar to steady state. Since the concentrations of hexavalent <br /> chromium in the remediation zone will likely asymptotically approach a <br /> terminal or minimum concentration achievable by flushing, the full-scale <br /> flushing operation will be discontinued when an apparent steady state <br /> condition has been reached in the remediation zone and there is no <br /> decrease in the concentration of hexavalent chromium with continued <br /> flushing. <br /> 11654.652 2-5 <br />