Chapter NR 256

NR 256.31(4) (4) “Gray iron” means a cast iron that gives a gray fracture due to the presence of flake graphite.

NR 256.31(5) (5) “Malleable iron” which means a cast iron made by a prolonged anneal of white cast iron in which either decarburization or graphitization, or both, eliminate some or all of the cementite, and where graphite is present in the form of temper carbon.

NR 256.31(6) (6) “Multiple ferrous melting furnace scrubber configuration” means a configuration where 2 or more discrete wet scrubbing devices are used in series in a single melting furnace exhaust gas stream.

NR 256.31(7) (7) “Primary metal cast” means the metal that is poured in the greatest quantity at an individual plant.

NR 256.31(8) (8) “Semi-wet scrubbing device” means a device to which water is added and totally evaporates prior to dry air pollution control.

NR 256.31(9) (9) “Steel” means and iron-base alloy containing manganese, carbon at less than 1.2% by weight, and often other alloying elements.

NR 256.31 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89

NR 256.32 NR 256.32 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 256.32 Note (1)   These concentrations shall be multiplied by the ratio of (5.33/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 256.32 Note (1)   These concentrations shall be multiplied by the ratio of (5.7/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 256.32 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 at all times.

NR 256.32 Note (1) In a multiple ferrous melting furnace scrubber configuration, each discrete wet scrubbing device with an associated wastewater discharge shall be given the mass allowance specified. The allowance will be identical for each device and based on the airflow of the exhaust gas stream that passes through the multiple scrubber configuration.

NR 256.32 Note (2) These concentrations shall be multiplied by the ratio of (0.42/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.

NR 256.32 Note (3) kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.

NR 256.32 Note (4) Within the range of 7.0 to 10.0 at all times.

NR 256.32 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.33 NR 256.33 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.

NR 256.33(1) (1) Any plant, including noncontinuous direct dischargers, which casts primarily malleable iron where metal poured is equal to or less than 3,557 tons per year or casts primarily steel, shall achieve the copper, lead, zinc, and total phenols effluent limitations contained in s. NR 256.32. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

NR 256.33(2) (2) Except as provided in 40 CFR 125.30 to 125.32, any plant, including noncontinuous direct dischargers, which casts primarily malleable iron where metal poured is greater than 3,557 tons per year or casts primarily ductile or gray iron shall achieve the following BAT effluent limitations. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

NR 256.33 Note (1)   These concentrations shall be multiplied by the ratio of (5.33/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 256.33 Note (1)   These concentrations shall be multiplied by the ratio of (5.7/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 256.33 Note (1)   These concentrations shall be multiplied by the ratio of (0.09/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 256.33 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 256.33 Note (1)   These concentrations shall be multiplied by the ratio of (17.7/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 256.33 Note (1)   These concentrations shall be multiplied by the ratio of (21.8/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 256.33 Note (1)   These concentrations shall be multiplied by the ratio of (89.5/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of sand reclaimed) for a specific plant.
(2)   kg/1,000 kkg (pounds per million pounds) of sand reclaimed.

NR 256.33 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.34 NR 256.34 New source performance standards.

NR 256.34(1) (1) Any new source, including noncontinuous direct dischargers, which casts primarily malleable iron where metal poured is equal to or less than 3,557 tons per year or casts primarily steel shall achieve the effluent standards contained in s. NR 256.32. Grinding scrubber operations may not discharge process wastewater pollutants to navigable waters.

NR 256.34(2) (2) Any new source, including noncontinuous direct dischargers, which casts primarily malleable iron where metal poured is greater than 3,557 tons per year or casts primarily ductile or gray iron shall achieve the following effluent standards. Grinding scrubber operations may not discharge process wastewater pollutants to waters of the state.

NR 256.34 Note (1)   These concentrations shall be multiplied by the ratio of (5.33/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 256.34 Note

NR 256.34 Note (1)   These concentrations shall be multiplied by the ratio of (0.09/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 256.34 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 256.34 Note (1) In a multiple ferrous melting furnace scrubber configuration, each discrete wet scrubbing device with an associated wastewater discharge shall be given the mass allowance specified. The allowance will be identical for each device and based on the airflow of the exhaust gas stream that passes through the multiple scrubber configuration.
(2)   These concentrations shall be multiplied by the ratio of (0.42/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 SCF of air scrubbed) for a specific plant.
(3)   kg/62.3 million Sm3 (pounds per billion SCF) of air scrubbed.
(4) Within the range of 7.0 to 10.0 at all times.

NR 256.34 Note (1)   These concentrations shall be multiplied by the ratio of (17.7/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 256.34 Note (1)   These concentrations shall be multiplied by the ratio of (21.8/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 256.34 Note (1)   These concentrations shall be multiplied by the ratio of (89.5/x) where x is the actual normalized process wastewater discharge flow (in gallons per 1,000 pounds of sand reclaimed) for a specific plant.
(2)   kg/1,000 kkg (pounds per million pounds) of sand reclaimed.
(3)   Within the range of 7.0 to 10.0 to all times.

NR 256.34 History History: Cr. Register, June, 1989, No. 402, eff. 7-17-89

NR 256.35 NR 256.35 Pretreatment standard for existing sources. Except as provided in ss. NR 211.13 and 211.14, any existing source subject to this subchapter which introduces pollutants into a publicly owned treatment works shall comply with ch. NR 211 and achieve the following pretreatment standards for existing sources. Grinding scrubber operations may not discharge process wastewater pollutants to a POTW.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1.784 tons per year.

(2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1.784 tons per year.

(2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

(3) TTO is comprised of the following toxic organic pollutants
  chloroform (trichloromethane)
  2,4-dimethylphenol

(4) Use as alternative to monitoring for TTO.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1.784 tons per year.

NR 256.35 Note (2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

NR 256.35 Note (3) TTO is comprised of the following toxic organic pollutants
  acenaphthene
  chloroform (trichloromethane)
  2,4-dichlorophenol
  2,4-dimethylphenol
  fluoranthene
  methylene chloride (dichloromethane)
  naphthalene
  pentachlorophenol
  phenol
  bis (2-ethylhexyl) phthalate
  butyl benzyl phthalate
  di-n-butyl phthalate
  diethyl phthalate
  benzo (a)anthracene (1,2-benzanthracene)
  chrysene
  acenaphthylene
  anthracene
  flourene
  phenanthrene
  pyrene

NR 256.35 Note (4) Use as alternative to monitoring for TTO.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1.784 tons per year.

(2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

(3) TTO is comprised of the following toxic organic pollutants:
  chloroform (trichloromethane)
  methylene chloride (dichloromethane)
  bis (2-ethylhexyl) phthalate
  acenaphthylene
  pyrene

(4) Use as alternative to monitoring for TTO.

NR 256.35 Note (1) In a multiple ferrous melting furnace scrubber configuration, each discrete wet scrubbing device with an associated wastewater discharge shall be given the mass allowance specified. The allowance will be identical for each device and based on the airflow of the exhaust gas stream that passes through the multiple scrubber configuration.

(2) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1,784 tons per year.

(3) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

(3) TTO is comprised of the following toxic organic pollutants:
  chloroform (trichloromethane)
  2,4-dichlorophenol
  2,4-dimethylphenol
  fluoranthene
  methylene chloride (dichloromethane)
  naphthalene
  phenol
  bis (2-ethylhexyl) phthalate
  butyl benzyl phthalate
  di-n-butyl phthalalte
  benzo (a)anthracene (1,2-benzanthracene)
  chrysene
  acenaphthylene
  anthracene
  fluorene
  phenanthrene
  pyrene

(4) Use as alternative to monitoring for TTO.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1,784 tons per year.

(2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

(3) TTO is comprised of the following toxic organic pollutants:
  chloroform (trichloromethane)
  2,4-dimethylphenol

(4) Use as alternative to monitoring for TTO.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1,784 tons per year.

(2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

(3) TTO is comprised of the following toxic organic pollutants:
  2,4-dimethylphenol
  dimethyl phthalate

(4) Use as alternative to monitoring for TTO.

NR 256.35 Note (1) Applies to plants which cast primarily ductile iron, primarily malleable iron where metal poured is greater than 3,557 tons per year, or primarily gray iron where metal poured is greater than 1,784 tons per year.

(2) Applies to plants which cast primarily steel, primarily malleable iron where metal poured is equal to or less than 3,557 tons per year, or primarily gray iron where metal poured is equal to or less than 1,784 tons per year.

(3) TTO is comprised of the following toxic organic pollutants:
  acenaphthene
  2,4-dimethylphenol
  fluoranthene
  methylene chloride (dichloromethane)
  naphtalene
  phenol
  bis (2-ethylhexyl) phthalate
  di-n-butyl phthalate
  diethyl phthalate
  dimethyl phthalate
  benzo(a)anthracene (1,2-benzanthracene)
  acenaphthylene
  pyrene
(4) Use as alternative to monitoring for TTO.

NR 256.35 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89

NR 256.36 NR 256.36 Pretreatment standards for new sources. Except as provided in s. NR 211.13, any new source subject to this subchapter which introduces pollutants into publicly owned treatment works shall comply with ch. NR 211 and achieve the pretreatment standards contained in s. NR 256.35. Grinding scrubber operations may not discharge process wastewater pollutants to a POTW.

NR 256.36 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89,

subch. IV of ch. NR 256 Subchapter IV — Zinc Casting Subcategory

NR 256.40 NR 256.40 Applicability; description of the zinc casting subcategory.

NR 256.40(1) (1) This subchapter applies to discharges to waters of the state and to introductions of pollutants into publicly owned treatment works from zinc casting operations. It applies to a production process if the molten metal contains, on average, greater than 50% by weight of zinc or if zinc comprises the greatest percentage of the metal, measured by weight.

NR 256.40(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 zinc performed as an integral part of zinc forming and conducted on-site at a zinc forming plant, which is regulated by the nonferrous metals forming point source category under 40 CFR Part 471.

NR 256.40(3) (3) Processing operations following the cooling of castings, except for grinding scrubber operations, may be regulated by nonferrous metals forming point source category under 40 CFR Part 471, electroplating point source category under ch. NR 260, or metal finishing point source category under ch. NR 261.

NR 256.40 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89,

NR 256.42 NR 256.42 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:

NR 256.42 Note (1) These concentrations shall be multiplied by the ratio of (5.35/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 at all times

NR 256.42 Note (1) These concentrations shall be multiplied by the ratio of (1.04/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 at all times

NR 256.42 Note (1) These concentrations shall be multiplied by the ratio of (0.243/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 256.42 Note (1) These concentrations shall be multiplied by the ratio of (47.3/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 at all times

NR 256.42 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.43 NR 256.43 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:

NR 256.43 Note (1) These concentrations shall be multiplied by the ratio of (5.34/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 256.43 Note (1) These concentrations shall be multiplied by the ratio of (1.04/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 256.43 Note (1) These concentrations shall be multiplied by the ratio of (0.243/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 256.43 Note (1) These concentrations shall be multiplied by the ratio of (47.3/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 256.43 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.44 NR 256.44 New source performance standards. Any new source subject to this subchapter, including noncontinuous direct dischargers, shall achieve the following standards:

NR 256.44 Note (1) These concentrations shall be multiplied by the ratio of (5.34/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 at all times

NR 256.44 Note (1) These concentrations shall be multiplied by the ratio of (1.04/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 at all times

NR 256.44 Note (1) These concentrations shall be multiplied by the ratio of (0.243/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 256.44 Note (1) These concentrations shall be multiplied by the ratio of (47.3/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 at all times

NR 256.44 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.45 NR 256.45 Pretreatment standards for existing sources. Except as provided in ss. NR 211.13 and 211.14 any existing source subject to this subchapter which introduces pollutants into a publicly owned treatment works shall comply with ch. NR 211 and achieve the following pretreatment for existing sources:

NR 256.45 Note (2) TTO is comprised of the following toxic organic pollutants:
  2,4,6-trichlorophenol
  para-chloro meta-cresol
  2,4-dichlorophenol
  2,4-dimethylphenol
  fluoranthene
  methylene chloride (dichloromethane)
  phenol
  bis(2-ethylhexyl) phthalate
  di-n-butyl phthalate
  diethyl phthalate
  tetrachloroethylene

(2) Use as alternative to monitoring for TTO.

NR 256.45 Note (1) TTO is comprised of the following toxic organic pollutants:
  acenaphthene
  2,4,6-trichlorophenol
  para-chloro meta-cresol
  2-chlorophenol
  2,4-dimethylphenol
  methylene chloride (dichloromethane)
  naphthalene
  phenol
  bis(2-ethylhexyl) phthalate
  di-n-butyl phthalate
  diethyl phthalate
  tetrachloroethylene
  toluene
  trichloroethylene

NR 256.45 Note (2)Use as alternative to monitoring for TTO.

NR 256.45 Note (1) TTO is comprised of the following toxic organic pollutants:
  2,4-dichlorophenol
  2,4-dimethylphenol
  fluoranthene
  methylene chloride (dichloromethane)
  naphthalene
  phenol
  bis(2-ethylhexyl) phthalate
  di-n-butyl phthalate
  tetrachloroethylene
  toluene
  trichloroethylene

NR 256.45 Note (2)Use as alternative to monitoring for TTO

NR 256.45 Note (1) TTO is comprised of the toxic organic pollutants listed in Table 83.
(2) Use as alternative to monitoring for TTO

NR 256.45 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.46 NR 256.46 Pretreatment standards for new sources. Except as provided in s. NR 211.13, any new source subject to this subchapter which introduces pollutants into publicly owned treatment works shall comply with ch. NR 211 and achieve the pretreatment standards contained in s. NR 256.45.

NR 256.46 History History: Cr. Register, June, 1989, No. 402, eff. 7-1-89.

NR 256.46 Note Note: The citations of the Wisconsin administrative code correspond to provisions of the code of federal regulations as cross-referenced in the following table: