NR 419.02(10r) (10r) “Maintenance wastewater” means wastewater generated by the draining of process fluid from components in the process unit into an individual drain system prior to or during maintenance activities. Any generation of wastewater that is routine or is generated by designed manufacturing processes is not maintenance wastewater.

NR 419.02 Note Note: Examples of activities that can generate maintenance wastewaters include descaling heat exchanger tubing bundles, cleaning distillation column traps, draining low legs and high point bleeds, draining pumps into an individual drain system and draining portions of the process unit for repair.

NR 419.02(11) (11) “Maximum theoretical emissions” means the quantity of VOC emissions that theoretically could be emitted by a stationary source without consideration of control devices based on the design capacity or maximum production capacity of the source and 8,760 hours of operation per year. In determining the maximum theoretical emissions for a source, the design capacity or maximum production capacity shall include the use of necessary coatings and inks with the highest VOC content used in practice by the source. When appropriate, and upon request by the source owner or operator, maximum theoretical emissions may be limited by the imposition of conditions in a federally enforceable permit. Such conditions shall be used in place of design capacity or maximum production capacity in calculating the maximum theoretical emissions for the source and may include, among other things, the establishment of production limitations, capacity limitations, or limitations on the VOC content of coatings or inks, or the hours of operation of any emission source, or a combination of any such limitations. Production or capacity limitations shall be established on the basis of no longer than one month and may allow for averaging for up to 12 consecutive months.

NR 419.02(11m) (11m) “Mechanical shoe seal” means metal sheets that are held vertically against the wall of the storage vessel by springs, weighted levers, or other mechanisms and connected to a floating roof by braces or other means. A flexible coated fabric spans the annular space between the metal sheet and the floating roof.

NR 419.02(12) (12) “Mold” means the matrix in which metal is cast and receives its form.

NR 419.02(12m) (12m) “Oil-water separator” or “organic-water separator” means a waste management unit, used to separate oil or organics from water. An oil-water or organic-water separator consists of not only the separation unit but also the forebay and other separator basins, skimmers, weirs, grit chambers, sludge hoppers, and bar screens that are located directly after the individual drain system and prior to additional treatment units such as an air flotation unit, clarifier, or biological treatment unit.

NR 419.02 Note Note: Examples of an oil-water or organic-water separator include an American Petroleum Institute separator, parallel-plate interceptor, and corrugated-plate interceptor with the associated ancillary equipment.

NR 419.02(13) (13) “Petroleum liquid” means crude petroleum, petroleum, condensate and any finished or intermediate products manufactured or extracted in a petroleum refinery or in a facility which produces oils from tar sands, shale, coal or coke.

NR 419.02(14) (14) “Photochemically reactive organic compounds” means any of the following:

NR 419.02(14)(a) (a) Group A: Hydrocarbons, alcohols, aldehydes, esters, ethers or ketones, which have olefinic or cyclo-olefinic type unsaturation.

NR 419.02(14)(b) (b) Group B: Aromatic compounds with 8 or more carbon atoms to the molecule, except ethylbenzene.

NR 419.02(14)(c) (c) Group C: Ethylbenzene, toluene or ketones having branched hydrocarbon structures.

NR 419.02(14)(d) (d) Group D: A solvent or mixture of organic compounds in which any of the following conditions are met:

NR 419.02(14)(d)1. 1. More than 20% of the total volume is composed of any combination of compounds listed in group A, B or C above.

NR 419.02(14)(d)2. 2. More than 5% of the total volume is composed of any combination of the compounds listed in group A above.

NR 419.02(14)(d)3. 3. More than 8% of the total volume is composed of any combination of the compounds listed in group B above.

NR 419.02(14b) (14b) “Pressure relief valve” means a valve used only to release an unplanned, non-routine discharge.

NR 419.02(14e) (14e) “Process unit” means the smallest set of process equipment that can operate independently and includes all operations necessary to achieve its process objective.

NR 419.02(14h) (14h) “Process wastewater” means wastewater which, during manufacturing or processing, comes into direct contact with, or results from, the production or use of any raw material, intermediate product, finished product, by-product, or waste product.

NR 419.02 Note Note: Examples of process wastewater are product tank drawdown or feed tank drawdown; water formed during a chemical reaction or used as a reactant; water used to wash impurities from organic products or reactants; water used to cool or quench organic vapor streams through direct contact; and condensed steam from jet ejector systems pulling vacuum on vessels containing organics.

NR 419.02(14L) (14L) “Recapture device” means an individual unit of equipment capable of and used for the purpose of recovering chemicals for disposal, but not normally for recycling, reuse, or sale. For purposes of the monitoring, recordkeeping, and reporting requirements of this chapter, recapture devices are considered recovery devices.

NR 419.02 Note Note: For example, a unit of equipment that would be considered a recapture device is one used for the recovery of chemicals for disposal. Recapture devices may include absorbers, carbon adsorbers, and condensers.

NR 419.02(14p) (14p) “Recovery device” means an individual unit of equipment capable of and normally used for the purpose of recovering chemicals for fuel value, use, reuse or for sale for fuel value, use, or reuse.

NR 419.02 Note Note: Examples of equipment that may be recovery devices include absorbers, carbon adsorbers, condensers, oil-water separators or organic-water separators, or organic removal devices such as decanters, strippers, or thin-film evaporation units.

NR 419.02(14r) (14r) “Sewer line” means a lateral trunk line, branch line, ditch or other conduit used to convey wastewater.

NR 419.02(14u) (14u) “Single-seal system” means a floating roof having one continuous seal that completely covers the space between the wall of the storage vessel and the edge of the floating roof.

NR 419.02(14y) (14y) “Steam stripper” means a column, including associated stripper feed tanks, condensers, or heat exchangers, used to remove compounds from wastewater.

NR 419.02(15) (15) “Submerged fill pipe” means any fill pipe with a discharge opening which is entirely submerged when the liquid level is 15.2 centimeters (6 inches) above the tank bottom.

NR 419.02(15d) (15d) “Surface impoundment” means a waste management unit which is a natural topographic depression, manmade excavation, or diked area formed primarily of earthen materials, but which may be lined with manmade materials, which is designed to hold an accumulation of liquid wastes or waste containing free liquids. A surface impoundment is used for the purpose of treating, storing, or disposing of process wastewater or affected residuals, and is not an injection well.