NR 274.014(2)(a)
(a) The difference between the precipitation for that month which falls within the impoundment and the evaporation from the impoundment for that month; or
NR 274.014(2)(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 274.014 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.016
NR 274.016
Pretreatment standards for new sources. Any new source subject to this subchapter which introduces pollutants into a POTW shall comply with
ch. NR 211.
NR 274.02
NR 274.02
Applicability; description of the primary aluminum smelting 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 aluminum from alumina in the Hall-Heroult process.
NR 274.02 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.021
NR 274.021
Measurements not detecting benzo(a)pyrene. If a permittee chooses to analyze for benzo(a)pyrene using any EPA approved method, any nondetected measurements shall be considered zeros for purposes of determining compliance with this subchapter.
NR 274.021 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.022
NR 274.022
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 shall achieve the following effluent limitations representing the degree of effluent reduction attainable by application of BPT:
-
See PDF for table 
(1) Within the range of 6.0 to 9.0.
NR 274.022 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.023 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.024
NR 274.024
New source performance standards. Any new source subject to this subchapter shall achieve the following standards:
-
See PDF for table
(1) This pollutant has no discharge allowance.
(2) Within the range of 7.0 to 10.0 at all times, but if this waste is discharged separately and without commingling with any other wastewater, the pH shall be within the range of 6.0 to 10.0 at all times.
-
See PDF for table
(1) This pollutant has no discharge allowance
(1) Within the range of 7.0 to 10.0 at all times.
NR 274.024 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.026 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.03
NR 274.03
Applicability; description of the secondary aluminum smelting subcategory. This subchapter applies to the discharge of pollutants to waters of the state and the introduction of pollutants into POTWs from the recovery, processing, and remelting of aluminum scrap to produce metallic aluminum alloys.
NR 274.03 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.032
NR 274.032
Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. NR 274.032(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 BPT.
NR 274.032(2)
(2) Facilities which use water for metal cooling may not discharge process wastewater pollutants to waters of the state.
NR 274.032(3)
(3) Facilities which use aluminum fluoride in their magnesium removal process may not discharge process wastewater pollutants to waters of the state.
(1) Within the range of 7.5 to 9.0.
(1) Within the range of 7.5 to 9.0.
NR 274.032 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.033 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.034
NR 274.034
New source performance standards. Any new source subject to this subchapter shall achieve the following standards:
-
See PDF for table
(1) At or before the commingling of delacquering scrubber liquor blowdown with other process or nonprocess waters.
(1) Within the range of 7.0 to 10.0 at all times.
NR 274.034 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.035 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.036 History
History: Cr. Register, March, 1991, No. 423, eff. 4-1-91. NR 274.04
NR 274.04
Applicability; description of the primary copper smelting subcategory. This subchapter applies to the discharge of pollutants to waters of the state and the introduction of pollutants into POTWs from the primary smelting of copper from ore or ore concentrates by processes such as roasting, converting, leaching if preceded by a pyrometallurgical step, slag granulation and dumping, and fire refining and from the casting of products from these operations.
NR 274.04 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.041
NR 274.041
Specialized definitions. The following definitions apply to the terms used in this subchapter:
NR 274.041(1)
(1) “Within the impoundment,” for purposes of calculating the volume of process wastewater which may be discharged, has the following meanings:
NR 274.041(1)(a)
(a) If the impoundment was constructed prior to February 27, 1975, “within the impoundment” means the surface area within the impoundment at the maximum capacity plus the surface area of the inside and outside slopes of the impoundment dam and the surface area between the outside edge of the impoundment dam and any seepage ditch adjacent to the dam upon which rain falls and is returned to the impoundment, but the surface area allowance for external appurtenances to the impoundment may not be more than 30% of the water surface area within the impoundment dam at maximum capacity.
NR 274.041(1)(b)
(b) If the impoundment was constructed on or after February 27, 1975, “within the impoundment” means the water surface area within the impoundment at maximum capacity.
NR 274.041 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.0415
NR 274.0415
Combining waste streams. If the waste streams subject to this subchapter are combined for treatment or discharge with waste streams subject to the primary electrolytic copper refining subchapter or the metallurgical acid plant subchapter, the quantity of each pollutant or pollutant property discharged may not exceed the quantity of each pollutant or pollutant property which could be discharged if each waste stream was discharged separately.
NR 274.0415 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.042
NR 274.042
Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available. NR 274.042(1)(1) Except as provided in
40 CFR 125.30 to
125.32 and
sub. (2), any existing point source subject to this primary copper smelting subchapter may not discharge process wastewater pollutants to waters of the state.
NR 274.042(2)
(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.
NR 274.042 History
History: Cr.
Register, March, 1991, No. 423, eff. 4-1-91.
NR 274.043
NR 274.043
Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable. NR 274.043(1)(1) Except as provided in
40 CFR 125.30 to
125.32 and
sub. (2), any existing point source subject to this subchapter may not discharge process wastewater pollutants into waters of the state.
NR 274.043(2)
(2) A process wastewater impoundment which 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, 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 25-year, 24-hour rainfall event, when such an event occurs.
