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Mr. David Bates -2- December 23 , 1966 <br /> Secondary containment and a leachate collection for the wet well, <br /> flow equalization basin, and the sludge drying beds, have been <br /> added by design change. <br /> Although the system is designed to minimize production of <br /> hazardous waste, all by-products of the system, such as filters, <br /> prefilters, residue from the sludge beds, etc. , will be sampled, <br /> analyzed for hazardous constituents, and disposed of at an <br /> approved disposal site. <br /> The annual volume of waste to be processed is estimated as 6 <br /> million gallons of storm water runoff from the North Yard. In <br /> addition, up to 300 million gallons of ground water can be <br /> treated and discharged. The treatment system has a design <br /> capacity of 260 gallons per minute with a normal flow of 150-250 <br /> gallons per minute. The system capacity can be increased to 910 <br /> gallons per minute by addition of a second set of exchangers. <br /> Surface impoundment free liquids, storm water runoff and ground <br /> water will be treated in conformance with the requirements of the <br /> NPDES permit and will be discharged to the Stockton Diverting <br /> Canal . <br /> The water treatment plant consists of the following: <br /> Components Approximate Size (gallons) <br /> Flow Equalization Basin 30, 000 <br /> Three Ion Exchange Columns 1, 500 each <br /> Caustic (NaOH) Storage Tank 6, 000 <br /> Acid (H2SO4) Storage Tank 6, 000 <br /> Two Neutralization Tanks 15, 000 each <br /> Recovery Tank 15, 000 <br /> Three Sludge Drying Beds (20 'x20 'x3 ' ) 9, 000 each <br /> The North Yard is surrounded by a six-foot chain-link fence <br /> topped with barbed wire. Access gates are locked during <br /> non-operational hours. Guard dogs and a contract security <br /> service representative are present during non-operational hours. <br /> Appropriate warning signs are posted. <br />