Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection - Wisconsin Pollutant Discharge Elimination System
Chapter NR 230 - Inorganic chemicals manufacturing
Subchapter V - Calcium oxide
Section NR 230.052 - 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 calender month, a process wastewater impoundment may discharge a volume equivalent to whatever is the greater of the following:

(5) Any process wastewater discharged according to sub. (4) shall comply with the following effluent limitations:

Table 4

Calcium Oxide

(1) Within the range of 6.0 to 9.0