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<br />002626 <br /> <br />. <br /> <br />. <br /> <br />o The orders by RWQCB do nol reflect the short-term nature of Interim Measure <br />No.3. <br /> <br />D The lack of a contingency plan in case the Ireatment/remediation fails. <br /> <br />o Injections to the aquifer should be closely monitored to ensure that it does not <br />drive the chromium 6 plume further towards the Colorado River. Also, the <br />receiving aquifer should be monitored to evaluate whether or not the reversal of <br />the gradient is being achieved by Ihe Interim Measure No.3. <br /> <br />o The pumping capacity should be increased to ensure the reversal of the gradient <br />and the treatment capacity should match the pumping capacity. <br /> <br />o ADEQ is concerned with the discharge to Colorado River and that there should be <br />limit on the concentration of the chromium 6. <br /> <br />o The NPDES discharge limitations should also include the constituent selenium. <br /> <br />On this issue, MWD, in a letter dated September 14, 2004, to the RWQCB expressed <br />its concern over direct discharge of the effluent to the Colorado River and suggested that <br />other alternatives of discharge including injection to groundwater and disposal into <br />evaporation ponds be considered. <br /> <br />Gerald R. Zimmerman <br />Executive Director <br /> <br />10 <br />