OAR 340-246-0030
Definitions
(1)
“Air toxics” means those pollutants known or suspected to cause cancer or other serious health effects, including but not limited to “hazardous air pollutants” or “HAPs” listed by the EPA under section 112(b) of the Federal Clean Air Act.(2)
“Ambient benchmark” means the concentration of an air toxic in outdoor air that would result in an excess lifetime cancer risk level of one in a million (1 x 10-6) or a non-cancer hazard quotient of one.(3)
“Bio-accumulation” means the net accumulation of a substance by an organism as a result of uptake from all routes of exposure (e.g., ingestion of food, intake of drinking water, direct contact, or inhalation).(4)
“Geographic area” means an area identified by DEQ where air toxics concentrations are estimated or measured at levels that exceed ambient benchmark concentrations.(5)
“Hazard quotient” means the ratio of the potential exposure to a single air toxic to the reference concentration for that pollutant. If the hazard quotient is calculated to be less than or equal to 1, then no adverse health effects are expected as a result of exposure. If the hazard quotient is greater than 1, then adverse health effects are possible.(6)
“High priority geographic area” means an area identified by DEQ where air toxics concentrations are estimated or measured at levels that exceed ambient benchmark concentrations and pose excess cancer risk above ten in a million, or non-cancer risk above a hazard quotient of one with the potential for serious adverse health effects.(7)
“Public receptor” means any outdoor area where members of the public have unrestricted access, including but not limited to residences, institutions (e.g. schools, hospitals), industrial, commercial, or office buildings, parks, recreational areas, public lands, streets or sidewalks.(8)
“Reference concentration” means an estimate of a continuous exposure or a daily exposure to the human population (including sensitive populations) that is likely to be without an appreciable risk of adverse non-cancer effects during a lifetime. The reference concentration can be derived from various types of human or animal data, with uncertainty factors generally applied to reflect limitations of the data used.(9)
“Sensitive human populations” means humans with increased susceptibility to the adverse effects of air toxics, including humans in prenatal or postnatal periods of development.(10)
“Source” means:(a)
An activity conducted by a person at a point, area, on-road mobile, or off-road mobile operation that emits air toxics; or(b)
Any building, structure, facility, installation or combination thereof that emits or is capable of emitting air contaminants to the atmosphere, is located on one or more contiguous or adjacent properties and is owned or operated by the same person or by persons under common control. The term includes all pollutant emitting activities that belong to a single major industrial group (i.e., that have the same two-digit code) as described in the Standard Industrial Classification Manual, (U.S. Office of Management and Budget, 1987) or that support the major industrial group.(11)
“Source Category” means:(a)
A source or group of sources that emit air toxics due to the use of the same or similar processes, including commercial, residential, public or private processes, which as a group can reduce air toxics emissions by employing similar control or prevention strategies or;(b)
All the pollutant emitting activities that belong to the same industrial grouping (i.e., that have the same two-digit code) as described in the Standard Industrial Classification Manual, (U.S. Office of Management and Budget, 1987).(12)
“Toxics Best Available Retrofit Technology”, or “TBART” means an air toxics emissions limitation based on the maximum degree of reduction of air toxics, determined on a case-by-case basis, that is feasible taking into consideration:(a)
What has been achieved in practice for that source category, or for similar processes or emissions;(b)
Energy and non-air quality health or environmental impacts; and(c)
Economic impacts, including the costs of changing existing processes or equipment or adding equipment or controls to existing processes and equipment. Such limitation may be based on a design, equipment, work practice or other operational standard, or combination thereof.
Source:
Rule 340-246-0030 — Definitions, https://secure.sos.state.or.us/oard/view.action?ruleNumber=340-246-0030.