1. Jerald O. Thaler, P.E. Fishbeck, Thompson, Carr & Huber, Inc. Elaine J. Venema, PE. Fleis & VandenBrink Engineering, Inc.

2. Potential Industrial Discharge Effects www.michigan.gov/deq

3. General Prohibition Federal Pretreatment Regulations 40 CFR 403 and Michigan Part 23--Pretreatment Rules require that: Any nondomestic user introducing pollutants into a POTW may not cause pass-through or interference www.michigan.gov/dgallery

4. Pass-through Discharge from a POTW that violates any NPDES permit requirement, including: Increase in magnitude of the violation Increase in duration of the violation Interference A user’s discharge that, alone or in combination with other user discharge(s), causes both of the following: Disruption of the POTW’s operation, wastewater treatment, and/or sludge processing Pass-through or restriction of sludge disposal

5. Compatible Pollutants of Concern (POC) Pollutants which a POTW is typically designed to treat, and typically subject to extra-strength surcharges: 5-day Biochemical Oxygen Demand (BOD 5 ) Total Suspended Solids (TSS) Total Phosphorus (Total-P) Ammonia Nitrogen (Ammonia-N)

6. What about Fats, Oil & Grease? While generally considered a compatible POC, represents a special case: Collection system “cholesterol” One of the major causes of sewer blockage Requires control at the source Often excluded from extra-strength surcharge program C. Bellmore/City of Mount Clemens, MI

7. Common Nondomestic Dischargers of Compatible POC Hospital Commercial Laundry Hauled Wastes (e.g., septage) Food Processing Dairy Brewery/Winery Rendering Landfill Leachate

8. Agenda Control Options 1 – Treatment at the Source 2 – Treatment at POTW with Insufficient Capacity 3 – Treatment at POTW with Excess Capacity Questions and Discussion