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Alternative Efflluent Limits


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Alternative Efflluent Limits

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Alternative Efflluent Limits

  1. 1. Alternative Effluent Limits Jason Knutson, DNR Henry Probst, The Probst Group
  2. 2. Options for Flexibility in Thermal Limits 1. Monthly Low-flow Receiving Water Data 2. Request Additional Mixing a. Site Inspection b. Visual Dye Study c. In-Stream Mixing Zone Study d. Mixing Zone Modeling 3. Real-time Limits 4. Site-specific Ambient Temperature Data 5. AEL 6. Individual Variance
  3. 3. What is an AEL? • State version of 316 (a) Study – ss. NR 106.70-76, Wis. Adm. Code • Granted when: “effluent temperature limitations calculated… are more stringent than necessary to assure the protection and propagation of a balanced, indigenous community of shellfish, fish and wildlife in and on the body of water into which the discharge is made.” • Considers additive effect of thermal pollution with: – other pollutants – other discharges
  4. 4. 2 Paths to an AEL 1. No Appreciable Harm to BIC (Balanced Indigenous Community) -Comparison of: -Biological data, IBIs 2. Protection and Propagation of BIC (Despite previous appreciable harm) a) Identify RIS (Representative Important Species) b) Examine impacts to RIS 1) Map/Model Plume 2) Compare in-stream temperatures to RIS’s spawning temperatures, gametogenesis temperatures, etc. (use DNR’s Thermal Development Doc) c) Propose Limits Protective of BIC Current Discharge Site Actual Upstream Reference Site or Historical Data Baseline
  5. 5. Approved Thermal AELs Port Washington WE Energies Oak Creek Elm Road WE Energies Point Beach NextEra In Effect Public Noticed WE Energies - Valley Alliant Edgewater In Progress Saputo Waupun Madison Met