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Toefco Engineering LLC DBA Imagineering Enterprises LLC 3 <br />PERMIT BRIEFING MEMO <br /> <br /> <br />1. Facility Description <br /> <br />Toefco Engineering LLC DBA Imagineering Enterprises LLC (Imagineering) engages in <br />corrosion protection, plating, and surface coating of various metal alloys. Imagineering conducts <br />Abrasive, solvent and/or chemical cleaning of alloy surfaces prior to treating surfaces with <br />phosphate (manganese or zinc) or chromium-based compounds. Final surface treatment also <br />includes electroless nickel, conversion of aluminum, or painted materials. The process lines are <br />named for the process and for the tank size in the line. For example, the 300 EN Line has 300- <br />gallon tanks for Electroless Nickel. Imagineering facility employs 33 employees and operates 3 <br />shifts, 5 days per week. <br /> <br />2. Discharge description: <br /> <br />All treated wastewater is ultimately discharged through the final discharge point known as site <br />SS1. Process lines are 600 EN, 300 EN, Anodize/Chem film, Anodize Type II and Type III, and <br />MSL-1 (miscellaneous line where Passivation or Phosphating can occur). Concentrates, dead <br />rinses, and rinse overflows are generated from different processes (Phosphating, Anodizing, Acid <br />Etching, and Electroless Nickel Plating) and are batch treated on-site and pH adjusted before final <br />discharge through site SS1 or shipped off site for disposal. The Passivation line is the source of <br />hexavalent chrome in the wastewater. The Passivation line consists of concentrates and <br />overflowing rinses only. <br /> <br />Air compressor blow down, boiler blow down, water softener backwash, and RO backwash are <br />discharged directly to the sanitary sewer without treatment. <br /> <br />From January 1, 2020 to December 31, 2020 : <br /> <br /> Average process flow: 22,670 gpd <br /> <br /> Maximum of 50,240 gpd <br /> <br />3. Sample Site Description <br /> <br />SS1 is located outside the main facility in a locked shed which is attached to the west wall of the <br />building. The wastewater discharge flows through a weir box for flow measurement in the shed <br />prior to discharge. The sample is collected in the discharge pipe after the final chamber of the weir <br />box. SS1 is both end-of-process and end-of-pipe (sanitary waste excluded). <br /> <br />4. Wastewater Treatment <br /> <br />Wastewater treatment consists of flow equalization, chrome reduction, chemical precipitation, <br />neutralization, polymer flocculation, settling, filtration, and sludge press as well as pH adjustment <br />for continuous flow rinse waters. <br /> <br /> <br /> <br />