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<br />3 <br />PERMIT BRIEFING MEMO <br /> <br />1. Facility Description <br /> <br />Imagineering Finishing Technologies engages in Chemfilm Line (Alodine), zinc phosphate metal <br />finishing, zinc manganese metal finishing, and chromate passivation of panels, parts, and pieces. <br />The finished parts are shipped off site. Imagineering operates between the hours of 9:00 PM to <br />5:00 PM. There are 86 employees who work in staggered shifts lasting 8.5 and 10 hours each <br />with no anticipated seasonal variation in production. <br /> <br />2. Discharge description <br /> <br />Imagineering discharge is split into wastewater that undergoes pretreatment and is discharged <br />through the sampling location, and wastewater that is not pretreated and is discharged directly to <br />the sewer. The only wastewater that is discharged at the sampling location is the wastewater that <br />undergoes pretreatment. Wastewater that is discharged directly to the sewer includes: boiler <br />blow down, water softener backwash, sanitary waste, and RO backwash brine water. <br />Wastewater that undergoes pretreatment before discharge includes Chromate Passivation line <br />rinse waters and concentrates, Zinc Phosphate line rinse waters and concentrates, Zinc <br />Manganese line rinse waters and concentrates, Chemfilm (Alodine) line rinse waters and <br />concentrates, and air scrubber pollution control wastewater. <br /> <br />Industrial process waters discharge to Outfall 260 via a weir box. For compliance sampling, 24 <br />hour flow proportional composite samples are pulled from the weir box via a composite sampler. <br />Discharge totalizer numbers are documented daily. The boiler sump discharge line has a paddle <br />wheel totalizer that is used to determine blowdown and reverse osmosis brine flow. This water <br />flows to the sanitary line. RO softener backwash is metered and discharged to the sanitary line <br />as well. <br /> <br />Imagineering reports that chromium, copper, nickel, and zinc are present in its wastewater. <br />Imagineering suspects that lead and silver may be present as well. <br /> <br />From July 2021 to July 2022 <br />Average Process Flow: 25, 242 gpd <br />Daily Maximum Process Flow: 46,919 gpd <br /> <br />3. Sample Site Description <br /> <br />Sample Site Outfall at Site #260 is located at the east end of the building. The sample site is <br />end-of-pipe; only process waters and pollution control wastewaters are discharged from the <br />sampling site. Therefore, there is no need for using the combined wastestream formula or any <br />other modification. <br /> <br />4. Wastewater Treatment <br />Wastewater treatment consists of chemical precipitation, flocculation, filtration, flow <br />equalization, neutralization and pH adjustment, sumps, and spill prevention.