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22. What type of waste water treatment will be used? <br /> X municipal individual (on-site) other <br /> The facility will dispose of approximately 80,000 gallons <br /> of wastewater per day (assuming a 28-shop case) into the <br /> municipal/metropolitan sewage treatment system. Wastewater <br /> will be pretreated at the facility to ensure compliance <br /> with applicable industrial wastewater effluent require- <br /> ments, including the federal categorical standards and <br /> local pretreatment limitations for the metropolitan <br /> disposal system for metals, and cyanide concentrations, <br /> wastewater pH, and any applicable federal regulations for <br /> wastewater discharges. <br /> Environmental Protection Agency (EPA) categorical <br /> wastewater pretreatment regulations 40 CRF Part 413, for <br /> electroplating facilities and 40 CFR Part 433, for metal <br /> finishing facilities apply to the proposed facility. <br /> Local pretreatment limitations for the metropolitan <br /> disposal system (MDS) as set by the Metropolitan Waste <br /> Control Commission (MWCC) also apply to the facility ( refer <br /> to Attachment 7 which presents the MDS limitations on <br /> discharges ( 6 MCAR § 6. 014 ) which are the MWCC ' s <br /> pretreatment standards for the project) . <br /> Metals which will be limited by concentration in the <br /> wastewater discharge include cadmium, total chromium, <br /> copper , lead, nickel , and zinc. There is also a limitation <br /> for mercury, but it is expected that mercury concentrations <br /> will be below minimal detectable limits in the wastewater <br /> discharge from the project to the sanitary sewer . The <br /> total cyanide concentration and pH will also be limited . <br /> In addition, the facility must pay for discharging total <br /> suspended solids concentrations or chemical oxygen demand <br /> levels over set base levels. Plastic polymers used for <br /> metal precipitation will contribute to the total suspended <br /> solids component. <br /> Processes to be used at the facility to remove metals from <br /> the incoming waste stream will include -ion exchange , <br /> activated carbon absorption, chromium reduction, <br /> electrochemical recovery, metal precipitation, filter <br /> press, and sludge thickening processes. Cyanide removal <br /> will be accomplished with a cyanide oxidation process. <br /> After metals removal , wastewater from these processes will <br /> be treated further by clarification and neutralization, and <br /> multimedia or sand filtration. <br /> Refer to Attachment 8, a letter from Edward J. Conway of <br /> Pope-Reid Associates , Incorporated, which discusses methods <br /> to be used to comply with the MDS limitations on <br /> discharges. <br /> 8. <br />