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3 <br />PERMIT BRIEFING MEMO <br /> <br />1. Facility Description <br /> <br />Toefco Engineering LLC DBA Imagineering Enterprises LLC located at 3722 Foundation Ct, <br />engages in Chemfilm Line (Alodine), zinc phosphate metal finishing, zinc manganese metal <br />finishing, and chromate passivation of panels, parts, and pieces. The finished parts are shipped <br />off site. Imagineering operates between the hours of 9:00 PM to 5:00 PM. There are 86 <br />employees who work in staggered shifts lasting 8.5 and 10 hours each with no anticipated <br />seasonal variation in production. <br /> <br />2. Discharge description <br /> <br />Toefco Engineering LLC DBA Imagineering Enterprises LLC discharge is split into wastewater <br />that undergoes pretreatment and is discharged through the sampling location, and wastewater <br />that is not pretreated and is discharged directly to the sewer. The only wastewater that is <br />discharged at the sampling location is the wastewater that undergoes pretreatment. Wastewater <br />that is discharged directly to the sewer includes: boiler blow down, water softener backwash, <br />sanitary waste, and RO backwash brine water. Wastewater that undergoes pretreatment before <br />discharge includes Chromate Passivation line rinse waters and concentrates, Zinc Phosphate line <br />rinse waters and concentrates, Zinc Manganese line rinse waters and concentrates, Chemfilm <br />(Alodine) line rinse waters and 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 />Toefco Engineering LLC DBA Imagineering Enterprises LLC reports that chromium, copper, <br />nickel, and zinc are present in its wastewater. Toefco Engineering LLC DBA Imagineering <br />Enterprises LLC 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 /> <br />