Modification of Industrial Wastewater Permit - St Joseph Energy Center

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Facility description St. Joseph Energy Center is an Electric Power Generation Facility that engages in the production of electricity using natural gas in a combustion turbine process. This facility operates 24 hours / 7 days per week on two 12 hour shifts. The facility is manned by 23 plant petsonnel. :PART I — EFFLUENT LI!'ITATION A. Sample Port and Collection Location 1. Sample Outfall Site #054 is located at the Hot Box location. Sample Site #054 is considered to be end -of -process. 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 # 054: 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) 3.0 2.0 Copper (mg/L) 3.0 1.2 Lead (mg/L) Report* Report* Mercury (mg/L) 0.00019 -na- Nickel (mg/L) I Oil and grease (mg/L) ,Oil and Grease TPH (mg/L) Silver (mg/L) Priority Pollutants (mg/L) Zinc (mg/L) Report* 300 100 Report* Report 3.0 Report* -na- -na- Report* -na- 2.0 *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. St. Joseph Energy Center Industrial Wastewater Discharge Permit page 1 of 39