Section NR 230.022 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available(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 BPT.(2) Except as provided in subs. (3), (4), and (5), process wastewater pollutants may not be discharged to waters of the state.(3) If a process wastewater impoundment is designed, constructed, and operated to contain the precipitation from the 10-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 the precipitation attributable to the 10-year, 24-hour rainfall event, when such an event occurs.(4) During any calendar month, a process wastewater impoundment may discharge a volume equivalent to whatever is the greater of the following: (a) The difference between the precipitation for that month which falls within the impoundment and the evaporation for that month; or(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.(5) Any process wastewater discharged according to sub. (3) shall comply with the following effluent limitations representing BPT: Table 1
Aluminum Sulfate
BPT Effluent Limitations |
milligrams per liter |
Pollutant or pollutant property | Maximum for any 1 day | Average of daily values for 30 consecutive days |
TSS | 50 | 25 |
pH | (1) | (1) |
(1) Within the range of 6.0 to 9.0
Wis. Admin. Code Department of Natural Resources NR 230.022
Cr. Register, September, 1990, No. 417, eff. 10-1-90.