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MARLEY COOLING TOWER COMPANY <br /> STOCKTON, CALIFORNIA FACILITY <br /> WATER TREATMENT PLANT <br /> DESCRIPTION OF OPERATION <br /> INTRODUCTION <br /> The Marley Cooling Tower Company (MCTC) is installing a water treatment <br /> plant on the North Yard of its Stockton, California wood treating facility. <br /> The plant will treat hater from three sources: storm water runoff from the <br /> paved North Yard plant site, settled storm water removed from an existing <br /> retention pond, and ground water removed from beneath the site. The storm <br /> water runoff and groundwater contain wood treating chemicals. The water <br /> treatment plant will remove wood treating chemicals from these waters so <br /> that the plant discharge contains no more than 50 parts per billion of each <br /> of the wood treating chemicals to meet the requirements of the NPDES permit. <br /> The discharge will also pose no threat to public health or the environment. <br /> The groundwater removal and treatment process proposed for the facility <br /> will prevent wood treating chemicals from entering public drinking water <br /> supplies. The chemicals removed will be recycled and reused by MCTC in the <br /> wood treating process. <br /> PROCESS DESCRIPTION <br /> Ion Exchange Process <br /> The wood treating chemicals to be removed consist of positively and <br /> negatively charged particles dissolved in water. The charged particles are <br /> called ions with the positively charged particles termed cations, and the <br /> S6 i <br /> HII <br />