NR 256.20(1)(1) This subchapter applies to discharges to waters of the state and to introductions of pollutants into publicly owned treatment works from copper casting operations. It applies to a production process if the molten metal contains, on average, greater than 50% by weight of copper or if copper comprises the greatest percentage of the metal, measured by weight.

NR 256.20(2)(2) This subchapter does not apply to the casting of ingots, pigs or other cast shapes following primary metal smelting, which is regulated by the nonferrous metals manufacturing point source category under 40 CFR Part 421. This subchapter does not apply to the casting of copper alloys containing either beryllium at 0.1% or greater by weight or precious metal at 30% or greater by weight.

NR 256.20(3)(3) Processing operations following the cooling of castings, except for grinding scrubber operations, may be regulated by the electroplating point source category under ch. NR 260 or metal finishing point source category under ch. NR 261.

NR 256.22NR 256.22 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, including noncontinuous direct dischargers, shall achieve the following BPT effluent limitations. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

NR 256.22 Note(1) These concentrations shall be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.
(3) Within the range of 7.0 to 10.0 to all times.

NR 256.22 Note(1) These concentrations shall be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.
(3) Within the range of 7.0 to 10.0 to all times.

NR 256.22 Note(1) These concentrations shall be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.
(3) Within the range of 7.0 to 10.0 at all times.

NR 256.22 Note(1) These concentrations shall be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.
(3) Within the range of 7.0 to 10.0 to all times.

NR 256.22 Note(1) These concentrations shall be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.
(3) Within the range of 7.0 to 10.0 to all times.

NR 256.22 Note(1) These concentrations shall be multiplied by the ratio of (61/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.
(3) Within the range of 7.0 to 10.0 to all times.

NR 256.23NR 256.23 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, including noncontinuous direct dischargers, shall achieve the following BAT effluent limitations. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

NR 256.23 Note(1) These concentrations shall be multiplied by the ratio of (4.8/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.

NR 256.23 Note(1) These concentrations shall be multiplied by the ratio of (145/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.

NR 256.23 Note(1) These concentrations shall be multiplied by the ratio of (0.086/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.

NR 256.23 Note(1) These concentrations shall be multiplied by the ratio of (1,320/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of metal poured) for a specific plant.
(2) kg/1,000 kkg (pounds per million pounds) of metal poured.

NR 256.23 Note(1) These concentrations shall be multiplied by the ratio of (0.282/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(2) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.