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<br />T K Finishing Industrial Wastewater Discharge Permit page 7 of 43 <br />Facility Description <br /> <br />TK Finishing applies a Black Oxide coating to customer supplied parts. Black Oxide is a chemical solution <br />which converts the surface of ferrous metals to black iron oxide, Fe3O4 Magnetite. The black oxide penetrates <br />the surface and becomes an integral part of the surface and also provides protection. T K Finishing runs only one <br />line which consists of 5 tanks, a wash tank, a rinse tank, a black oxide process tank, another rinse tank, and an <br />oily rinse to protect the finished parts. Wastewater discharged from TK Finishing's process is subject to the Metal <br />Finishing Categorical Standards found at 40 CFR 433.17 (PSNS). <br />Part I – Effluent Limitations <br /> <br />A. Sample Port and Collection Location <br /> <br />1. The sampling location (site 4045) is located in the northwest corner of the suite. Tanks 2 and 4 <br />discharge rinse waters from the black oxide line into a 55 gallon drum, where pH is adjusted as <br />needed. The effluent flows from the 55 gallon drum to the final discharge 55 gallon drum. A <br />sump pump moves the wastewater from the drum to the City of South Bend Sewer System. <br />Wastewater is sampled from the 55 gallon drum discharge pipe before it is pumped to the city <br />sewer. This site is considered end of process. <br /> <br />2. Any discharge of water or waste having a pH lower than 6.0 S.U. or a pH higher than 11.0 S.U. <br />is prohibited. In addition, the permittee’s wastewater discharge shall not exceed the following <br />effluent limitations: <br /> Effluent limitations for Sample Site Outfall # 4045: <br /> <br />Parameter Daily Maximum Limit (mg/L) Monthly Average Limit (mg/L) <br />Arsenic (mg/L) *Report *Report <br />Cadmium (mg/L) *Report *Report <br />Chromium (mg/L) 2.77 1.71 <br />Copper (mg/L) *Report *Report <br />Cyanide (mg/L) 1.20 0.65 <br />Lead (mg/L) *Report *Report <br />Mercury (mg/L) 0.00019 -na- <br />Nickel (mg/L) 3.98 0.8 <br />Oil and grease (mg/l) 300 -na- <br />Oil and Grease TPH (mg/l) 100 -na- <br />Silver (mg/L) *Report *Report <br />TTO (mg/l) 2.13 -na- <br />Zinc (mg/L) 2.61 1.48