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.

NR 257.03(19) (19) “Rolling” means the reduction in thickness or diameter of a workpiece by passing it between rollers lubricated with either neat oils or emulsions.

NR 257.03(20) (20) “Stationary casting” means the pouring of molten aluminum into molds and allowing the metal to air cool.

NR 257.03(21) (21) “TTO” means the sum of the masses or concentrations of each of the following toxic organic compounds which is found in the discharge at a concentration greater than 0.010 mg/l: - See PDF for table

NR 257.03(22) (22) “Wet scrubber” means an air pollution control device used to remove particulates and fumes from air by entraining the pollutants in a water spray.

NR 257.04(1) (1) Analyses for cyanide are not required when both of the following conditions are met:

NR 257.04(2) (2) As an alternative pretreatment monitoring procedure, the POTW user may measure and limit oil and grease to the levels shown in the pretreatment standards in lieu of measuring and regulating TTO.

NR 257.04(3) (3) Compliance with the maximum monthly average effluent limitations and pretreatment standards is required regardless of the number of samples analyzed and averaged. The maximum monthly average effluent limitations and pretreatment standards shall be the basis for monthly average discharge limits in direct discharge permits and for pretreatment standards.

NR 257.05(1) (1) Any existing source subject to this chapter which discharges to waters of the state shall achieve;

NR 257.05(2) (2) Any new source subject to this chapter which discharges to waters of the state shall achieve NSPS at the commencement of discharge.

NR 257.05(3) (3) Any existing source subject to this chapter which discharges process wastewater pollutants to a POTW shall achieve PSES by October 24, 1986.

NR 257.05(4) (4) Any new source subject to this chapter which discharges process wastewater pollutants to a POTW shall achieve PSNS at the commencement of discharge.

NR 257.11(1) (1) “Ancillary operation” means any operation which is not a core operation but which is performed on-site following or preceding the rolling operation, such as continuous rod casting, continuous sheet casting, solution heat treatment, and cleaning or etching.

NR 257.11(2) (2) “Core operation” means rolling using neat oils, roll grinding, sawing, annealing, stationary casting, homogenizing, artificial aging, degreasing, and stamping.

NR 257.21(1) (1) “Ancillary operation” means any operation which is not a core operation but which is performed on-site following or preceding the rolling operation, such as direct chill casting, solution heat treatment, cleaning or etching, and degassing.

NR 257.21(2) (2) “Core operation” means rolling using emulsions, roll grinding, stationary casting, homogenizing, artificial aging, annealing, and sawing.