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Findings of Fact - page 4 Metropolitan Metals Recovery EAW September, 1983 be limited by concentration in the wastewater discharge include cadmium, total chromium, copper, lead, nickel and zinc. There is also a limitation for mercury, but it is expected that mercury con- centrations will be below minimal detectable limits in the wastewater discharge from the project to the sanitary sewer. Total cyanide concentration and pH will also be limited. (EAW) In addition, the facility must pay for discharging total suspended solids (TSS) concentrations or chemical oxygen demand levels over set base levels. Plastic polymers used for metal precipitation will contribute to the TSS component. Methods to be used to comply with the M®S limitations on discharges are discussed in EAW Attachment 7, a letter from Edward J. Conway of Pope -Raid Associates, Incorporated. It must be determined if the Environmental Protection Agency (EPA,) wastewater pretreatment .regulations apply to a central processing recovery facility such as the proposed facility, and if they do, to what extent they apply to the proposed facility. The MPCA will solicit a letter from the proposer, the H30C'A and the EPA will review the project, and the EPA will determine if the federal categorical regulations for alectroplaf -ng and metal fin.-hing plants apply in any part to the proposed faciiity. (Em, OW errata) Sanitary and storm sewers are combined in the area of the proposed facility. However, because of the relatively infrequent combined sewer overflow discharges end relatively ssrall flow from this project, assuming even a 45-shop case (as in the EAW Attachmernt, letter from Pope -Raid Associates dated June 21, 1993), the project is not expected to pose a threat to river water quality. (EAW, personal communication Jerry Winslow# Division of Water Quality Monitoring and Analysis Unit, 8/17/63) A new, .larger capacity sewer pipes will be installed for the project to handle peak flows to the sewer. (EAW Attachment 1) The Agency staff expects that there will be a greater reduction in the amount of motals to be discharged to they sanitary sewer with than project than if each individual metal waste generator pretreated its own wastes. (personal. communication Randy Dunnette, Division of Water Quality Permits Section, 8/22/83) The affect of construction activities on surface water quality on site will be minimal. The only required outside construction will be: in- stallation of the secondary containment system for accidental spills or leaks. All other construction required for the project will taker place in the existing warehouse building and, as such, will not effect surfacer water runoff. (EAW, EAW errata)