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<br /> <br />PERMIT BRIEFING MEMO <br /> <br />1. Facility Description <br /> <br />Unifrax 1 LLC engages in the production of high temperature ceramic fiber insulation and value <br />added products. The ceramic fiber is produced from raw materials such as alumina, sand, zircon, <br />and kaolin. At this facility, insulation is manufactured in bulk, needled into blanket form, or is <br />processed into coatings/mixes. <br /> <br />Unifrax operates 24 hours a day, 7 days a week. Unifrax currently employs 140 people. There is <br />no seasonal variation in production. <br /> <br />It has been determined that Unifrax does not fit into category 40 CFR 414: organic chemicals, <br />plastics, and synthetic fibers. <br /> <br />2. Discharge Description <br /> <br />This permit oversees, but not limited to, wastewater discharged at Sample Site 5-1. Discharge from <br />Sample Site 5-1 includes domestic wastewater and process wastewater from the fabrication <br />department which includes SiFab Line addition. The wastewater leaves the facility, is channeled <br />through Sample Site 5-1, and is measured via Parshall Flume and ultrasonic flow meter prior to <br />discharge into the City of South Bend Sewer System. <br /> <br />Unifrax has identified copper and zinc as known to be present in their wastewater. Unifrax suspects <br />that all toxic organic compounds are absent. <br /> <br />From May 2020 to May 2021, Unifrax’s wastewater flows were as follows: <br />The 12-month average daily flow was: 16,244 gpd. <br />The 12-month maximum daily flow was: 115,360 gallons <br />SiFab Line is estimated to add 4,000 to 10,000 gpd <br /> <br />Note that precipitation is diverted to a storm pond and is not discharged to the City of South Bend’s <br />POTW. Wastewater from furnace trough is also discharged to the storm pond. <br /> <br />3. Sample Site Description <br /> <br />Sample monitoring is conducted at Sample Site 5-1, which is located in a sample shed south of the <br />facility. Inside the sampling shed is a manhole with a light plastic cover that has a handle to to lift <br />it out of the opening. The wastewater is metered with a three (3) inch parshall flume and ultrasonic <br />flow meter. The flow meter output is in the shed and is equiped such that flow proportioned <br />sampling may be conducted. <br /> <br />4. Wastewater Treatment <br /> <br />Unifrax employs the use of grit removal, filtration, and a settling tank to pretreat its wastewater. <br /> <br />5. Classification <br /> <br />Unifrax 1 LLC is classified as a Significant Industrial User (SIU). Unifrax Corporation is further <br />categorized as a C industry per the City’s Industrial Pretreatment Program Monitoring Plan in