Section NR 274.062 - 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 and subs. (2) and (3), any existing point source subject to this subchapter may not discharge process wastewater pollutants to waters of the state.(2) A process wastewater impoundment which 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, 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.(3) During any calendar month, a process wastewater impoundment may discharge from the overflow a volume equivalent to whatever is the greatest of the following: (a) The difference between the precipitation for that month which falls within the impoundment and the evaporation from the impoundment 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.(c) Any process wastewater discharge according to this subsection shall comply with the following limitations: Table 6-1
Secondary Copper
BPT Effluent Limitations |
| Maximum for any 1 day c | Maximum average of daily values for 30 onsecutive days |
Pollutant or pollutant property | mg/l (ppm) |
Total suspended solids | 50 | 25 |
Copper | 0.5 | 0.25 |
Zinc | 10 | 5 |
Oil and grease | 20 | 10 |
pH | (1) | (1) |
(1) Within the range of 6.0 to 9.0.
Wis. Admin. Code Department of Natural Resources § NR 274.062
Cr. Register, March, 1991, No. 423, eff. 4-1-91.