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Findings of Fact - page 3 Metropolitan Metals Recovery EAW September, 1983 (TSCA)and Resource Conservation and Recovery Act (RCRA), and state and county requirements for hazardous waste treatment and storage facili- ties. The project will also be subject to requirements for trans- porting toxic or hazardous wastes as requir.;,, by TSCA and RCRA, re- spectively, and Hennepin County, including spill control and truck routing requirements. (EAW, EAW errata) For this project, all wastes will be stored in a diked area with an impervious surface in the project building. In addition, to prevent ground water or surface water contamination outside the building, a secondary containment system will be required in the dock loading/unloading area. The project will comply with federal RCRA and state requirements for spill prevention control plans and countermeasures, container adequacy and management practices and requirements for the design and operation of secondary containment systems. The storage area (and loading/unloading area) containment system must be able to hold spills, leaks and precipitationst.hat is,the base under storage con- tainers trust be impervious to contain leaks and spills, be adequately sloped, and have sufficient capacity to contain the volume of the largest container or lot of the volutae of the containers located in a storage area. it must also contain a slump or collection area to prevent overflow of the containment system. (EAW) Processes to be used at the facility to remove metals from the in- coming warner str®am will include ion exchange, activated carbon ad- sorption, chromium seduction, electrochemical recovery, metal precipi- tation, filter press, and sludge thickening processes. CYaside removal will be acc*wplished with a cyanide oxidation process. For a 26-shop case, it is estimated that the project could dispose of Wproxiaately 64000 gallons of wastewater per day into the mnicipai/metropolitan sewage treatment system (letter from Pope - Raid Associates, dated dune 21, 1983) . Wastewater will be pretreated at the facility to ensure coc*lianc+e with applicable industrial waste- watar effluent requirements, which will -be included in the industrial wastewater discharge permit to be issued by the HWCC. After metals removal, wastewater Lcom these processes will be treated further by clarification and n*mtralization, an-- multimedia or sand filtration. +the wastewater to be discharged to the sanitary sewer will meet the mWCC's and applicable federal pretreatment standards. pretreatment limitations for the metropolitan disposal system (MM) as set by the mwCC are presented in EAW Attachment 3. The metals to