Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System › Chapter NR 257 - Aluminum forming › Section NR 257.03 - General definitions

Current through June 24, 2024
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:
(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.
(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.
(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.
(4)
				"Contact cooling water" means any wastewater which contacts the aluminum
				workpiece or the raw materials used in aluminum forming.
(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.
(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.
(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.
(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.
(9)
				"Emulsion" means a stable dispersion of 2 immiscible liquids, usually oil and
				water.
(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).
(11) "Extrusion" means the
				application of pressure to a billet of aluminum to force the aluminum to flow
				through a die orifice.
(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.
(13)
				"Heat treatment" means the application of heat of specified temperature and
				duration to change the physical properties of the metal.
(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.
(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.
(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.
(17) "Neat oil" means an oil used as a
				lubricant with few or no added impurities.
(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.
(19)
				"Rolling" means the reduction in thickness or diameter of a workpiece by
				passing it between rollers lubricated with either neat oils or
				emulsions.
(20) "Stationary
				casting" means the pouring of molten aluminum into molds and allowing the metal
				to air cool.
(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:
p-chloro-m-cre-sol
tetrachloroethyl-ene
2-chlorophenol
toluene
2,4-dinitrotoluene
trichloroethylene
1,2-diphenylhy-drazine
endosulfan sulfate
ethylbenzene
bis(2-ethyl-hexyl)phthalate
fluoranthene
diethylphthalate
isophorone
3,4-benzofluoran-thene
napthalene
benzo(k)fluoran-thene
N-nitrosodipheny-lamine
chrysene
phenol
acenaphthylene
benzo(a)pyrene
anthracene
benzo(ghi)per-ylene
di-n-butyl phthal-ate
fluorene
endrin
phenanthrene
endrin aldehyde
dibenzo(a,h)anthra-cene
PCB-1242, 1254, 1221,1232,1248, 1260,1016
indeno(1,2,3-c,d)p-yrene
acenaphthene
pyrene
(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.