REQUIREMENTS FOR ANIMAL FEEDLOTS

Subpart 1. Definitions. For purposes of this part, the terms in items A to D have the meanings given them. A. "Animal feedlot" has the meaning given in part 7020.0300 , subpart 3. B. "Animal manure" has the meaning given in part 7020.0300 , subpart 4. C. "Manure storage area" has the meaning given in part 7020.0300 , subpart 14. D. "Treatment works" has the meaning given in Minnesota Statutes, section 115.01 , subdivision 21, and includes a vegetated filter or buffer strip located between an animal feedlot or a manure storage area and a receiving water. Subp. 2. Effluent limits for a discharge. A. Any person discharging pollutants to surface waters of the state from an animal feedlot or manure storage area who is not regulated by federal requirements under part 7053.0225 , subpart 1, shall comply with the following limits after allowance for pollutant removal by a treatment works: Pollutant Limiting Concentration Five-day biochemical oxygen demand 25 mg/L (arithmetic mean of all samples taken during any calendar month) If the discharge is directly to or affects a lake, shallow lake, or reservoir, or to the waters listed in part 7053.0255 , subpart 5, the person discharging the pollutants shall comply with the nutrient control requirements in part 7053.0255 , subpart 3, items A and B. Feedlots are not considered new or expanded discharges as defined in part 7053.0255 , subpart 2. B. The effluent limits in item A are not applicable whenever rainfall events, either chronic or catastrophic, cause an overflow from an animal feedlot or manure storage area designed, constructed, and operated: (1) to meet the effluent limits in item A for rainfall events less than or equal to a 25-year, 24-hour rainfall event for that location; or (2) to collect and contain the runoff from a 25-year, 24-hour rainfall event for that location.