Or. Admin. Code § 340-246-0030 - Definitions
The definitions in OAR 340-200-0020, 340-218-0030, 340-244-0030, OAR 340-247-0020 and this rule apply to this division. If the same term is defined in this division and elsewhere, the definition in this division applies.
(1) "Ambient benchmark concentration" means
the concentration of a toxic air contaminant 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 and is numerically equivalent to the
"Toxicity Reference Value" as defined under OAR 340 247-0020.
(2) "Geographic area" means an area
identified by DEQ where toxic air contaminant concentrations are estimated or
measured at levels that exceed ambient benchmark concentrations.
(3) "Hazard quotient" means the ratio of the
potential exposure to a single toxic air contaminant 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.
(4)
"High priority geographic area" means an area identified by DEQ where toxic air
contaminant 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.
(5) "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.
(6) "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.
(7) "Sensitive
human populations" means humans with increased susceptibility to the adverse
effects of toxic air contaminants, including humans in prenatal or postnatal
periods of development.
(8)
"Source" means:
(a) An activity conducted by
a person at a point, area, on-road mobile, or off-road mobile operation that
emits toxic air contaminants; 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.
(9) "Source Category" means:
(a) A source or group of sources that emit
toxic air contaminants due to the use of the same or similar processes,
including commercial, residential, public or private processes, which as a
group can reduce toxic air contaminant 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).
Notes
Publications: Publications referenced are available from the agency.
Statutory/Other Authority: ORS 468.020, 468.035, 468A.010(1), 468A.015, 468A.025 & 468A.135
Statutes/Other Implemented: ORS 468.035, 468A.010(1), 468A.015, 468A.025 & 468A.135
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