The definitions in OAR 340-200-0020, 340-204-0010,
340-246-0030, 340-247-0020 and this rule apply to this division. If the same
term is defined in more than one of these rules, then the definitions in this
division take precedence, followed by the definitions in OAR 340-200-0020,
followed by the definitions in OAR 340-247-0020, followed by the definitions in
OAR 340-246-0030, and finally the definitions in OAR 340-204-0010.
(1) "ABEL" means a computer model developed
by EPA that evaluates a corporation's or partnership's ability to afford
compliance costs, cleanup costs or civil penalties. ABEL is available upon
request from DEQ.
(2) "Actual toxic
air contaminant emission rate" means:
(a) For
an existing source, the toxic air contaminant emissions rate from the source's
actual production; or
(b) For a new
or reconstructed source, the toxic air contaminant emissions rate from the
reasonably anticipated actual production by the new or reconstructed
source.
(3) "Acute"
means evaluated over a 24-hour period or day.
(4) "Acute exposure location" means an
exposure location outside the boundary of a source being modeled for the
maximum daily average concentrations of a toxic air contaminant, and that is:
(a) A chronic exposure location; or
(b) A location where people may spend several
hours of one day.
(5)
"AERMOD" is the EPA approved steady-state air dispersion model, specified in 40
CFR part
51 , Appendix W, "Guidelines on Air Quality Models (Revised)," that is
the primary model used for the analysis of ambient concentrations for
regulatory compliance. AERMOD uses a fully developed set of meteorological and
terrain data. AERMOD stands for American Meteorological Society/Environmental
Protection Agency Regulatory Model. AERMOD is available upon request from
DEQ.
(6) "AERSCREEN" is the EPA
approved screening dispersion model, specified in 40 CFR part
51 , Appendix W,
"Guidelines on Air Quality Models (Revised)," based on AERMOD. The model uses
conservative screening meteorology to produce estimates of "worst-case"
concentration estimates that are equal to or greater than the estimates
produced by AERMOD. AERSCREEN stands for American Meteorological
Society/Environmental Protection Agency Regulatory Screening Model. AERSCREEN
is available upon request from DEQ.
(7) "Aggregate TEU Level" means the risk
action levels, as identified under that name in OAR
340-245- 8010 Table 1, that
aggregated TEUs may not exceed, based on a calculation of the cumulative risk
of all aggregated TEUs.
(8)
"Aggregated TEUs" means all of a source's TEUs that are identified by an owner
or operator with total cumulative risk less than the Aggregate TEU Level. A TEU
that is identified as one of the aggregated TEUs is referred to in the singular
as an aggregated TEU.
(9) "Area of
impact" means the geographic area where risk is determined to be above the
applicable Risk Action Level, and is determined by AERMOD or other comparable
model approved by DEQ.
(10)
"Chronic" means evaluated over a one-year period or longer.
(11) "Chronic exposure location" means an
exposure location outside the boundary of a source being modeled for annual
average concentrations of a toxic air contaminant, and can be either:
(a) A residential exposure location;
or
(b) A nonresidential exposure
location.
(12)
"Community Engagement Level" means the risk action levels, as identified under
that name in OAR
340-245-8010 Table 1, at which DEQ will conduct community
engagement.
(13) "Construction
permit" means a Construction Air Contaminant Discharge Permit issued under OAR
chapter 340, division 216, or a Standard Air Contaminant Discharge Permit used
for approval of Type 3 or 4 changes under OAR chapter 340, division
210.
(14) "De minimis source" means
a source whose excess cancer risk, chronic noncancer risk and acute noncancer
risk estimates are each less than or equal to the Source Permit Level in OAR
340-245-8010 Table 1 when calculated based on the source's capacity, as
determined under OAR
340-245-0050(7).
(15) "DEQ notice date" means the date that
DEQ sends a notice to an owner or operator that a risk assessment is
required.
(16) "Environmental
Justice" means equal protection from environmental and health hazards, and
meaningful public participation in decisions that affect the environment in
which people live, work, learn, practice spirituality, and play. Environmental
Justice communities include minority and low-income communities, tribal
communities, and other communities traditionally underrepresented in the public
process.
(17) "Excess cancer risk"
means the probability of developing cancer resulting from exposure to toxic air
contaminant emissions from a TEU or an entire source under an applicable
exposure scenario, over and above the background rate of cancer. Excess cancer
risk is expressed in terms of "X" in a million, and means that approximately
"X" number of additional cases of cancer would be expected in a population of
one million people subject to the applicable exposure scenario.
(18) "Exempt source" means a source at which
all TEUs are exempt TEUs or a source that has no TEUs that emit toxic air
contaminants, as determined under OAR
340-245-0050(6).
(19) "Exempt TEU" means a TEU that DEQ has
determined is exempt under OAR
340-245-0060(3). An exempt TEU is not required
to comply with any other requirements of this division, other than those
applicable to qualify as an exempt TEU and OAR
340-245-0060(4)(c)(A).
(20) "Existing source" means a source that:
(a) Commenced construction before November
16, 2018; or
(b) Submitted all
necessary applications to DEQ under OAR 340 divisions 210 or 216 before
November 16, 2018, and all such applications were deemed complete by
DEQ.
(21) "Existing TEU"
means a TEU that is not a new or modified TEU.
(22) "Exposure location" means a location
where people, including sensitive populations, actually live or normally
congregate and will be exposed to a toxic air contaminant present in the air,
and thus be the location of an air quality modeling receptor at which toxic air
contaminant concentrations and risk are evaluated. Exposure locations are
associated with exposure scenarios and identified based on allowed land use
zoning, except as allowed under OAR
340-245-0210(1)(a)(F) or when DEQ has
sufficient information to determine that an area is being used in a manner
contrary to its land use zoning.
(23) "Exposure scenario" means a set of
assumptions about how a population is exposed to toxic air contaminants.
Included in the assumptions are the type of people exposed (e.g., children or
adults), and the frequency and duration of exposure associated with the
scenario (e.g., residential or occupational use). Exposure scenarios are
associated with exposure locations (e.g., nonresidential child).
(24) "Fixed capital cost" means the capital
needed to purchase and construct all the depreciable components of a
source.
(25) "Hazard Index number"
or "Hazard Index," as defined in Oregon Laws 2018, chapter 102, section 2,
means a number equal to the sum of the hazard quotients attributable to toxic
air contaminants that have noncancer effects on the same target organs or organ
systems.
(26) "Hazard quotient," as
defined in Oregon Laws 2018, chapter 102, section 2, means a calculated
numerical value that is used to evaluate noncancer health risk from exposure to
a single toxic air contaminant. The calculated numerical value is the ratio of
the air concentration of a toxic air contaminant to the noncancer Risk-Based
Concentration at which no serious adverse human health effects are expected to
occur.
(27) "Immediate Curtailment
Level" means the risk action levels, as identified under that name in OAR
340-245-8010 Table 1, at which DEQ will require immediate risk reduction as
provided in OAR
340-245-0130(7).
(28) "INDIPAY" means a computer model
developed by EPA that evaluates an individual's ability to afford compliance
costs, cleanup costs or civil penalties. INDIPAY is available upon request from
DEQ.
(29) "Inhalation Unit Risk"
means the upper-bound lifetime excess cancer risk estimated to result from
continuous exposure to a toxic air contaminant at a concentration of 1
µg/m³ in air. The interpretation of
inhalation unit risk would be as follows: if unit risk = 2 *
10-6 per
µg/m³, then two excess cancer cases
(upper bound estimate) are expected to develop per one million people if
exposed daily for 70 years to one microgram of the toxic air contaminant per
cubic meter of air.
(30)
"Multipathway" means consideration of exposure pathways in addition to
inhalation of chemicals in air, such as incidental ingestion and dermal contact
with toxic air contaminants migrating to soil and water.
(31) "MUNIPAY" means a computer model
developed by EPA that evaluates a municipality's or regional utility's ability
to afford compliance costs, cleanup costs or civil penalties. MUNIPAY is
available upon request from DEQ.
(32) "New or modified TEU" means:
(a) A TEU at an existing source where one of
the following criteria is met:
(A) Approval to
construct or operate under OAR
340-210-0205 through
340-210-0250 was not
required for the TEU, and construction commenced on or after November 16,
2018;
(B) Approval to construct or
operate under OAR
340-210-0205 through
340-210-0250 is or was required for the
TEU, and the owner or operator submitted the application on or after November
16, 2018; or
(C) Approval to
construct or operate under OAR
340-210-0205 through
340-210-0250 was required
for the TEU, but the owner or operator did not obtain the approval as required,
and construction commenced on or after the following, as applicable:
(i) For Type 1 changes under OAR
340-210-0225, 10 days before November 16, 2018;
(ii) For Type 2 changes under OAR
340-210-0225, 60 days before November 16, 2018;
(iii) For Type 3 changes under OAR
340-210-0225, 120 days before November 16, 2018; and
(iv) For Type 4 changes under OAR
340-210-0225, 240 days before November 16, 2018;
(b) With respect to a modification
to a TEU, approval to construct or operate refers to approval to construct or
operate the modification.
(33) "New source" means a source that:
(a) Is not an existing source; or
(b) Was an existing source that has moved to
a new location that is not contiguous or adjacent to its original facility
location on or after November 17, 2021, excluding existing sources permitted as
portable sources.
(34)
"Noncancer risk" means the chance of noncancer harmful effects to human health
resulting from exposure to toxic air contaminant emissions from a TEU or an
entire source under an applicable exposure scenario. There are two types of
noncancer risk, chronic and acute. Noncancer risk is expressed numerically
using the Hazard Index. Below a Hazard Index of 1, adverse noncancer health
effects are unlikely, and above a Hazard Index of 1, adverse noncancer health
effects become more likely.
(35)
"Nonresident" means people who regularly spend time at a location but do not
reside there. This includes, but is not limited to, children attending schools
and daycare facilities and adults at workplaces.
(36) "Nonresidential exposure location" means
an exposure location outside the boundary of a source where people may
reasonably be present for a few hours several days per week, possibly over a
period of several years, and that is zoned for uses that do not allow
residential use. A nonresidential exposure location includes nonresidential
worker exposure locations and nonresidential child exposure
locations.
(37) "Notification area"
means the area of impact or the area within a distance of 1.5 kilometers of a
source, whichever is greater.
(38)
"Operating permit" means a General, Basic, Simple or Standard Air Contaminant
Discharge Permit under OAR chapter 340, division 216 or an Oregon Title V
Operating Permit under OAR chapter 340, division 218.
(39) "Owner or operator" means any person who
owns, leases, operates, controls, or supervises a stationary source.
(40) "Permit Denial Level" means the risk
action levels, as identified under that name in OAR
340-245- 8010 Table 1, at
which DEQ will not approve an operating permit for a new or reconstructed
source, as provided in OAR
340-245-0100(5).
(41) "Pollution Prevention" means any
practice that reduces, eliminates, or prevents pollution at its source, as
described in OAR
340-245-0140.
(42)
"Reconstructed," as defined in ORS 468A.335(5), means an individual project is
constructed at an air contamination source that, once constructed, increases
the hourly capacity of any changed equipment to emit, and where the fixed
capital cost of new components exceeds 50 percent of the fixed capital cost
that would have been required to construct a comparable new source.
(43) "Residential exposure location" means an
exposure location outside the boundary of a source where people may reasonably
be present for most hours of each day over a period of many years, including
individual houses and areas that are zoned to allow residential use either
exclusively or in conjunction with other uses.
(44) "Risk" means the chance of harmful
effects to human health resulting from exposure to a toxic air contaminant
emitted from a TEU or an entire source under an applicable exposure scenario.
For the purpose of these rules, risk includes three types of risk: excess
cancer risk, chronic noncancer risk, and acute noncancer risk.
(45) "Risk Action Level" as identified under
OAR
340-245-8010 Table 1, means the levels of risk posed by a source or a TEU
at which particular requirements of these rules will apply, or the owner or
operator will be required to take specific action, depending on the risk posed
to the area of impact as described in these rules.
(46) "Risk assessment" means a procedure that
identifies toxic air contaminant emissions from a source or a TEU and
calculates the risk from those emissions. This term specifically refers to the
procedures under OAR
340-245-0050(8) through (11) and may include the results
of air monitoring as allowed under OAR
340-245-0050(1)(c)(B). The procedures
are designated Level 1 through Level 4, respectively, with complexity of a risk
assessment increasing as the level numeration increases, (i.e., a Level 1 Risk
Assessment is the simplest and a Level 4 Risk Assessment is the most
complex).
(47) "Risk Determination
Ratio" means the calculated value used to determine compliance with noncancer
Risk Action Levels for existing sources as determined under OAR
340-245-0200.
(48) "Risk limit"
means a condition or requirement in a permit or permit addendum that serves to
limit the risk from a source or part of a source. Such conditions or
requirements may include, but are not restricted to, limits on risk from the
source or part of a source, limits on emissions of one or more toxic air
contaminants, limits on emissions from one or more TEUs, or limits on source
operation.
(49) "Risk-Based
Concentration" or "RBC" means the concentration of a toxic air contaminant
listed in OAR
340-245-8010 Table 2 that, for the designated exposure scenario,
results in an excess cancer risk of one in one million, or a noncancer hazard
quotient of one for either chronic exposure or acute daily exposure.
(50) "Risk Reduction Level" means the risk
action levels, as identified under that name in OAR
340-245- 8010 Table 1, at
which the owner or operator of an existing source will be required to have an
approved Risk Reduction Plan under OAR
340-245-0130.
(51) "Sensitive Population" means people with
biological traits that may magnify the harmful effects of toxic air contaminant
exposures that include individuals undergoing rapid rates of physiological
change, such as children, pregnant women and their fetuses, and individuals
with impaired physiological conditions, such as elderly people with existing
diseases such as heart disease or asthma. Other sensitive populations include
those with lower levels of protective biological mechanisms due to genetic
factors and those with increased exposure rates.
(52) "Significant TEU" means a TEU that is
not an exempt TEU and is not an aggregated TEU.
(53) "Source Permit Level" means the risk
action levels, as identified under that name in OAR
340-245- 8010 Table
1.
(54) "Source risk" means the
cumulative risk from all toxic air contaminants emitted by all significant and
aggregated TEUs at a source.
(55)
"TBACT Level" means the risk action levels, as identified under that name in
OAR
340-245-8010 Table 1, below which an existing source will be considered to
be in compliance with these rules without having to further reduce its risk,
and above which will require the owner or operator of the existing source
either to demonstrate that its significant TEUs meet TBACT or to further reduce
risk from the source, under OAR
340-245-0050(1)(c).
(56) "TLAER Level" means the risk action
levels, as identified under that name in OAR
340-245-8010 Table 1, below which
a new or reconstructed source will be considered to be in compliance with these
rules, and above which will require the owner or operator of the new or
reconstructed source to demonstrate that its significant TEUs meet TLAER, under
OAR
340-245-0050(2)(b).
(57) "Toxic
Air Contaminant Permit Addendum" means written authorization that incorporates
the requirements under this division into a permit by amending an Air
Contaminant Discharge Permit or a Title V Operating Permit, or in the case of a
source assigned to a General Air Contaminant Discharge Permit, means written
authorization imposing requirements under this division as additional source-
specific permit conditions.
(58)
"Toxics Best Available Control Technology" or "TBACT" means a toxic air
contaminant emission limitation or emission control measure or measures based
on the maximum degree of reduction of toxic air contaminants that is feasible,
determined using the procedures in OAR
340-245-0220.
(59) "Toxics emissions unit" or "TEU" means
an emissions unit, or one or more individual emissions producing activities,
that emit or have the potential to emit any toxic air contaminant, as
designated under OAR
340-245-0060.
(60) "Toxics Lowest Achievable Emission Rate"
or "TLAER" means that rate of emissions which reflects the most stringent
emission limitation which is achieved in practice by a source in the same class
or category of sources as the proposed source, determined using the procedures
in OAR
340-245-0220.