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WASTE DISCHARGE REQUIREMENTS -3- <br /> MARLEY COOLING TOWER COMPANY <br /> SAN JOAQUIN COUNTY <br /> the existing ion exchange treatment system, identified in Attachment B, <br /> incorporated herein and made part of this Order. The new system was placed <br /> in operation in January 1992. <br /> 12. The new treatment plant consists of an electrochemical reduction (Andco) <br /> and precipitation process which uses iron as the reducing agent for the <br /> hexavalent chromium followed by iron co-precipitation using pH adjustments. <br /> The addition of polymers and further pH adjustments are used to optimize <br /> settling. The effluent is then filtered prior to discharge. The solids <br /> from the clarifier are pumped and accumulated in a filter press. The filter <br /> press filtrate and mixed media filter backwash are returned to the <br /> treatment plant for further treatment. <br /> 13. The ground water extraction system is scheduled to operate in a cyclical <br /> fashion with each cycle lasting 48 hours. During one cycle, water will be <br /> extracted primarily from the north zone near the site. During the next <br /> cycle, ground water extraction will be from the area south of the site. <br /> Water extracted from the north zone will have higher chemical <br /> concentrations. During south zone pumping, the capacity of the treatment <br /> plant will not be utilized fully unless supplemental waste sources are <br /> added. In either mode, when sufficient storm water is accumulated on the <br /> North Yard to justify treatment, the operator will manually initiate storm <br /> water treatment through the Andco system. Ground water from selected wells <br /> will simultaneously be delivered to the ion exchange treatment system. A <br /> third mode of operation entails continuous extraction of ground water from <br /> wells throughout the extraction network. Flushing water may be added to <br /> supplement the ground water concentrations. <br /> 14. The Report of Waste Discharge describes the combined storm water and ground <br /> water characteristics prior to treatment as follows: <br /> Average Flow: Existing Plant - 0.374 million gallons per day (mgd) <br /> Expanded Plant - 0.716 million gallons per day (mgd) <br /> Expanded Plant Hydraulic Capacity: 1.008 mgd <br /> Expanded Plant Treatment Capacity: 0.716 mgd <br /> Average Temperature: Storm water - ambient <br /> Ground water - 68° F <br /> pH: Ground water - 7.0 to 7.5 <br />