Register, August, 1993, No. 452
Chapter NR 257
ALUMINUM FORMING
NR 257.03 General definitions.
NR 257.04 Monitoring and reporting requirements.
NR 257.05 Compliance dates.
NR 257.06 Removal allowances for pretreatment standards.
Subchapter I — Rolling With Neat Oils Subcategory
NR 257.10 Applicability; description of the rolling with neat oils subcategory.
NR 257.11 Specialized definitions.
NR 257.12 Effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available.
NR 257.13 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
NR 257.14 New source performance standards.
NR 257.15 Pretreatment standards for existing sources.
NR 257.16 Pretreatment standards for new sources.
Subchapter II — The Rolling With Emulsions Subcategory
NR 257.20 Applicability; description of the rolling with emulsions subcategory.
NR 257.21 Specialized definitions.
NR 257.22 Effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available.
NR 257.23 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
NR 257.24 New source performance standards.
NR 257.25 Pretreatment standards for existing sources.
NR 257.26 Pretreatment standards for new sources.
Subchapter III — The Extrusion Subcategory
NR 257.30 Applicability; description of the extrusion subcategory.
NR 257.31 Specialized definitions.
NR 257.32 Effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available.
NR 257.33 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
NR 257.34 New source performance standards.
NR 257.35 Pretreatment standards for existing sources.
NR 257.36 Pretreatment standards for new sources.
Subchapter IV — The Forging Subcategory
NR 257.40 Applicability; description of the forging subcategory.
NR 257.41 Specialized definitions.
NR 257.44 New source performance standards.
NR 257.45 Pretreatment standards for existing sources.
NR 257.46 Pretreatment standards for new sources.
Subchapter V — The Drawing With Neat Oils Subcategory
NR 257.50 Applicability; description of the drawing with neat oils subcategory.
NR 257.51 Specialized definitions.
NR 257.52 Effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available.
NR 257.53 Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
NR 257.54 New source performance standards.
NR 257.55 Pretreatment standards for existing sources.
NR 257.56 Pretreatment standards for new sources.
Subchapter VI — The Drawing With Emulsions or Soaps Subcategory
NR 257.60 Applicability; description of the drawing with emulsions or soaps subcategory.
NR 257.61 Specialized definitions.
NR 257.62 Effluent limitations representing the degree of effluent reduction attainable by application of the best practicable control technology currently available.
NR 257.63 Effluent limitations representing the degree of effluent reduction attainable by the application of best available technology economically achievable.
NR 257.64 New source performance standards.
NR 257.65 Pretreatment standards for existing sources.
NR 257.66 Pretreatment standards for new sources.
NR 257.01
NR 257.01 Purpose. The purpose of this chapter is to establish effluent limitations, performance standards, and pretreatment standards for the discharge of process wastes from the aluminum forming point source category and its subcategories.
NR 257.01 History
History: Cr.
Register, November, 1989, No. 407, eff. 12-1-89.
NR 257.02(1)
(1) This chapter applies to any aluminum forming facility which discharges or may discharge pollutants to waters of the state or which introduces or may introduce pollutants into a publicly owned treatment works.
NR 257.02(2)
(2) This chapter applies to chemical or electrochemical treatments applied to the surface of the aluminum when these surface treatments are performed at [the] aluminum forming site. When these surface treatments are not performed at the aluminum forming site, regulations for electroplating,
ch. NR 260, or metal finishing,
ch. NR 261, apply.
NR 257.02(3)
(3) This chapter applies to aluminum casting when the casting is performed as an integral part of aluminum forming and is located at the aluminum forming site. When aluminum forming is performed on the same site as primary aluminum reduction, this chapter applies if the aluminum cools prior to casting. If the aluminum does not cool prior to casting, the regulations for nonferrous metals manufacturing,
ch. NR 274, apply.
NR 257.02 History
History: Cr.
Register, November, 1989, No. 407, eff. 12-1-89.
NR 257.03
NR 257.03 General definitions. In addition to the definitions set forth in
ss. NR 205.03,
205.04, and
211.03, the following definitions apply to the terms used in this chapter:
NR 257.03(1)
(1) “Aluminum forming” means a set of manufacturing operations in which aluminum and aluminum alloys are made into semifinished products by hot or cold working, such as rolling, drawing, extruding, and forging, and related operations such as heat treatment and casting.
NR 257.03(2)
(2) “Ancillary operation” means a manufacturing operation that has a large flow, discharges significant amounts of pollutants, and may not be present at every plant in a subcategory but when present is an integral part of the aluminum forming process.
NR 257.03(3)
(3) “Cleaning or etching operation” means a chemical solution bath and rinse or series of rinses designed to produce a desired surface finish on the workpiece, including conversion coating and anodizing when performed as an integral part of the aluminum forming operations, and the air pollution scrubbers used to control fumes from the chemical solution baths.
NR 257.03(4)
(4) “Contact cooling water” means any wastewater which contacts the aluminum workpiece or the raw materials used in aluminum forming.
NR 257.03(5)
(5) “Continuous casting” means the production of sheet, rod, or other long shapes by solidifying the metal while it is being poured through an open ended mold using little or no contact cooling water.
NR 257.03(6)
(6) “Degassing” means the removal of dissolved hydrogen from the molten aluminum prior to casting by adding chemicals and bubbling gases through the molten aluminum.
NR 257.03(7)
(7) “Direct chill casting” means an operation in which molten aluminum is poured into a water cooled mold, contact cooling water is sprayed onto the aluminum as the aluminum is dropped into the mold, and the aluminum ingot falls into a water bath at the end of the process.
NR 257.03(8)
(8) “Drawing” means the process of pulling metal through a die or succession of dies to reduce the metal's diameter or alter its shape, using either neat oils, emulsions, or soap solutions as a lubricant.
NR 257.03(9)
(9) “Emulsion” means a stable dispersion of 2 immiscible liquids, usually oil and water.
NR 257.03(10)
(10) “Existing source” means any point source from which pollutants may be discharged either directly into the waters of the state or into a POTW, except a new source as defined in
sub. (18).
NR 257.03(11)
(11) “Extrusion” means the application of pressure to a billet of aluminum to force the aluminum to flow through a die orifice.
NR 257.03(12)
(12) “Forging” means the exertion of pressure on dies or rolls surrounding heated aluminum stock to force the stock to change shape and, when dies are used, to take the shape of the die.
NR 257.03(13)
(13) “Heat treatment” means the application of heat of specified temperature and duration to change the physical properties of the metal.
NR 257.03(14)
(14) “Hot water seal” means a water bath heated to approximately 180
° F used to seal the surface coating on formed aluminum which has been anodized and coated.
NR 257.03(15)
(15) “lb/million off-lbs” means pounds of pollutant introduced into the wastestream per million pounds of aluminum or aluminum alloy removed from a forming or ancillary operation at the end of a process cycle for transfer to a different machine or process.
NR 257.03(16)
(16) “mg/off-kg” means milligrams of pollutant introduced into the wastestream per kilogram of aluminum or aluminum alloy removed from a forming or ancillary operation at the end of a process cycle for transfer to a different machine or process.
NR 257.03(17)
(17) “Neat oil” means an oil used as a lubricant with few or no added impurities.
NR 257.03(18)
(18) “New source” means any point source for which construction commenced after November 22, 1982 and from which pollutants may be discharged either directly into waters of the state or into a publicly owned treatment works.
