Wisconsin Administrative Code › Department of Natural Resources › NR 600-699 - Environmental Protection - Hazardous Waste Management › Chapter NR 665 - Interim License Hazardous Waste Treatment, Storage And Disposal Facility Standards › Subchapter CC - Air Emission Standards for Tanks, Surface Impoundments and Containers › Section NR 665.1081 - Definitions

Current through June 24, 2024
As used in this subchapter, all terms not defined in this
					 section shall have the meaning given them in ch. 291, Stats., and chs. NR 660
					 to 666.
(1) "Average volatile organic
				  concentration" or "average VO concentration" means the mass-weighted average
				  volatile organic concentration of a hazardous waste determined according to s.
				  NR
				  665.1084.
(2) "Closure device" means a cap, hatch, lid,
				  plug, seal, valve or other type of fitting that blocks an opening in a cover
				  such that when the device is secured in the closed position it prevents or
				  reduces air pollutant emissions to the atmosphere. Closure devices include
				  devices that are detachable from the cover (e.g., a sampling port cap),
				  manually operated (e.g., a hinged access lid or hatch) or automatically
				  operated (e.g., a spring-loaded pressure relief valve).
(3) "Continuous seal" means a seal that forms
				  a continuous closure that completely covers the space between the edge of the
				  floating roof and the wall of a tank. A continuous seal may be a vapor-mounted
				  seal, liquid-mounted seal or metallic shoe seal. A continuous seal may be
				  constructed of fastened segments so as to form a continuous seal.
(4) "Cover" means a device that provides a
				  continuous barrier over the hazardous waste managed in a unit to prevent or
				  reduce air pollutant emissions to the atmosphere. A cover may have openings
				  (such as access hatches, sampling ports, gauge wells) that are necessary for
				  operation, inspection, maintenance and repair of the unit on which the cover is
				  used. A cover may be a separate piece of equipment which can be detached and
				  removed from the unit or a cover may be formed by structural features
				  permanently integrated into the design of the unit.
(5) "Enclosure" means a structure that
				  surrounds a tank or container, captures organic vapors emitted from the tank or
				  container and vents the captured vapors through a closed-vent system to a
				  control device.
(6) "External
				  floating roof" means a pontoon-type or double-deck type cover that rests on the
				  surface of the material managed in a tank with no fixed roof.
(7) "Fixed roof" means a cover that is
				  mounted on a unit in a stationary position and does not move with fluctuations
				  in the level of the material managed in the unit.
(8) "Floating membrane cover" means a cover
				  consisting of a synthetic flexible membrane material that rests upon and is
				  supported by the hazardous waste being managed in a surface
				  impoundment.
(9) "Floating roof"
				  means a cover consisting of a double deck, pontoon single deck or internal
				  floating cover which rests upon and is supported by the material being
				  contained, and is equipped with a continuous seal.
(10) "Hard-piping" means pipe or tubing that
				  is manufactured and properly installed according to relevant standards and good
				  engineering practices.
(11) "In
				  light material service" means the container is used to manage a material for
				  which all of the following conditions apply:
(a) The vapor pressure of one or more of the
				  organic constituents in the material is greater than 0.3 kilopascals (kPa) at
				  20 °C.
(b) The total
				  concentration of the pure organic constituents having a vapor pressure greater
				  than 0.3 kPa at 20 °C is equal to or greater than 20 percent by
				  weight.