NR 230.022(4)(b) (b) The difference between the mean precipitation for that month which falls within the impoundment and the mean evaporation for that month as established for the impoundment’s location by the national climatic center, national oceanic and atmospheric administration or as otherwise established if no monthly evaporation has been determined by the national climatic center.

NR 230.022(5) (5) Any process wastewater discharged according to sub. (3) shall comply with the following effluent limitations representing BPT:

- See PDF for table

NR 230.022 Note (1)Within the range of 6.0 to 9.0

NR 230.022 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.023 NR 230.023 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

NR 230.023(1) (1) Except as provided in 40 CFR 125.30 to 125.32, any existing point source subject to this subchapter shall achieve the following effluent limitations representing the degree of effluent reduction attainable by application of BAT.

NR 230.023(2) (2) Except as provided in sub. (3), process wastewater pollutants may not be discharged to waters of the state.

NR 230.023(3) (3) If a process wastewater impoundment is designed, constructed, and operated to contain the precipitation from the 25-year, 24-hour rainfall event as established for the impoundment’s location by the national climatic center, national oceanic and atmospheric administration, the impoundment may discharge a volume of process wastewater equivalent to the volume of precipitation which falls within the impoundment in excess of that attributable to the 25-year, 24-hour rainfall event, when such an event occurs.

NR 230.023 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.024 NR 230.024 New source performance standards.

NR 230.024(1) (1) Except as provided in sub. (2), any new source subject to this subchapter may not discharge process wastewater pollutants to waters of the state.

NR 230.024(2) (2) If a process wastewater impoundment is designed, constructed, and operated to contain the precipitation from the 25-year, 24-hour rainfall event as established for the impoundment’s location by the national climatic center, national oceanic and atmospheric administration, the impoundment may discharge a volume of process wastewater equivalent to the volume of precipitation which falls within the impoundment in excess of that attributable to the 25-year, 24-hour rainfall event, when such an event occurs.

NR 230.024 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.025 NR 230.025 Pretreatment standards for existing sources. Except as provided in ss. NR 211.13 and 211.14, any existing source subject to this subchapter which introduces pollutants into a POTW shall comply with ch. NR 211 and achieve the following PSES:

- See PDF for table

NR 230.025 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.026 NR 230.026 Pretreatment standards for new sources. Except as provided in s. NR 211.13 and sub. (2), any new source subject to this subchapter which introduces pollutants into a POTW shall comply with ch. NR 211 and achieve the standards set forth in s. NR 230.024.

NR 230.026 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

subch. III of ch. NR 230 Subchapter III — Calcium carbide

NR 230.03 NR 230.03 Applicability; description of the calcium carbide subcategory. This subchapter applies to the discharge of pollutants to waters of the state and the introduction of pollutants into POTWs from the production of calcium carbide in uncovered furnaces.

NR 230.03 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.032 NR 230.032 Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. Except as provided in 40 CFR 125.30 to 125.32, any existing point source subject to this subchapter may not discharge process wastewater pollutants to waters of the state.

NR 230.032 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.033 NR 230.033 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. Except as provided in 40 CFR 125.30 to 125.32, any existing point source subject to this subchapter may not discharge process wastewater pollutants to waters of the state.

NR 230.033 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.034 NR 230.034 New source performance standards. Any new source subject to this subchapter may not discharge process wastewater pollutants to waters of the state.

NR 230.034 History History: Cr. Register, September, 1990, No. 417, eff. 10-1-90.

NR 230.036 NR 230.036 Pretreatment standards for new sources. Except as provided in s. NR 211.13, any new source subject to this subchapter which introduces pollutants into a POTW shall comply with ch. NR 211 and may not discharge process wastewater pollutants into a POTW.