Industrial Wastewater Discharge Permit Renewal - Suzuki

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Suzuki Garphyttan CorporationIndustrial Wastewater Discharge Permitpage 9 of 47 Facility Description Suzuki Garphyttan Wire engages in the manufacture of steel wire automotive springs. The spring wire manufacturing consists of acid cleaning, drawing and zinc phosphate coating. Suzuki is Categorical Industrial User (CIU) as defined in the South Bend Municipal Code. Specifically Suzuki is classified as a metal finisher covered by 40 CFR 433.17 (PSNS) due to the zinc phosphate coating. PART I – EFFLUENT LIMITATION A. Sample Port and Collection Location 1. Sample Site Outfall #231 is located outside the main facility in a locked shed, which is attached to the north wall of the building. The wastewater discharge flows through a weir box for flow measurement in the shed prior to discharge. The composite sample is collected in the discharge pipe after the final chamber of the weir box. Grab samples are collected after the final discharge tank in the weir box. Samples are of process water only, sanitary is excluded. 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. is prohibited. In addition, the permittee’s wastewater discharge shall not exceed the following effluent limitations: Effluent limitations for Sample Site Outfall # 231: Parameter Daily Maximum Limit (mg/L) Monthly Average Limit (mg/L) Arsenic (mg/L) 1.0 0.3 Cadmium (mg/L) Report* Report* Chromium (mg/L) 2.77 1.71 Copper (mg/L) 3.38 0.8 Cyanide (mg/L) 1.20 0.65 Lead (mg/L) 0.69 0.43 Mercury (mg/L) 0.00019 --NA-- Nickel (mg/L) 3.98 0.8 Oil & Grease (mg/L) 300 --NA-- Oil and Grease TPH (mg/L) 100 --NA-- Silver (mg/L) 0.43 0.24 TTO (mg/L) 2.13 --NA-- Zinc (mg/L) 2.61 1.48 *Note: In accordance with the City of South Bend’s “What You Need Is What You Get” allocation method, local Daily Maximum and Monthly Average limits have only been developed for those pollutants that have been observed at or above certain concentrations in each Significant Industrial User’s wastewater discharge. If “Report” appears on the table, it has been determined that an allocation of this pollutant is not necessary. The permittee shall compare any monitoring data for these pollutants with the screening table in Part I (3) below. If pollutant concentrations above the screening levels are observed, a local Daily Maximum and/or Monthly Average limit may be developed for that pollutant.