Or. Admin. Code § 340-225-0050 - Requirements for Analysis in PSD Class II and Class III Areas
Modeling: For determining compliance with the AAQS, PSD increments, and other requirements in PSD Class II and Class III areas, the following methods must be used:
(1)
For each regulated pollutant, a single source impact analysis is sufficient to
show compliance with the AAQS and PSD increments if:
(a) The modeled impacts from emission
increases equal to or greater than a SER above the netting basis due to the
proposed source or modification being evaluated are less than the Class II
significant impact levels specified in OAR
340-200-0020; and
(b) The owner or operator provides an
assessment of factors that may impact the air quality conditions in the area to
show that the SIL by itself ensures that the proposed source or modification
will not cause or contribute to a new violation of an AAQS and PSD increment.
The assessment must take into consideration but is not limited to the following
factors:
(A) The background ambient
concentration relative to the AAQS;
(B) The emission increases and decreases
since the baseline concentration year from other sources that are expected to
cause a significant concentration gradient in the vicinity of the source.
Determination of significant concentration gradient may take into account
factors including but not limited to ROI formula, spatial distribution of
existing emission sources, topography, and meteorology.
(2) If the requirement in section
(1) is not satisfied, the owner or operator of a proposed source being
evaluated must complete a competing source analysis as follows:
(a) For demonstrating compliance with the PSD
Class II and III increments (as defined in OAR
340-202-0210), the owner or
operator of the source or modification must show that modeled impacts from the
proposed increased emissions, above the modeled baseline concentration, plus
competing PSD increment consuming source impacts above the modeled baseline
concentration are less than the PSD increments for all averaging times;
and
(b) For demonstrating
compliance with the AAQS, the owner or operator of the source must show that
the total modeled impacts plus total competing source impacts plus general
background concentrations are less than the AAQS for all averaging
times.
(3) The owner or
operator of a source or modification must also provide an analysis of:
(a) The impairment to visibility, soils and
vegetation that would occur as a result of the source or modification, and
general commercial, residential, industrial and other growth associated with
the source or modification. As a part of this analysis, deposition modeling
analysis is required for sources emitting heavy metals above the SERs as
defined in OAR 340-200-0020. Concentration and
deposition modeling may also be required for sources emitting other compounds
on a case-by-case basis; and
(b)
The air quality concentration projected for the area as a result of general
commercial, residential, industrial and other growth associated with the source
or modification.
(4) Any
analyses performed under this section must be done in compliance with OAR
340-225-0030 and
340-225-0040, as applicable.
[NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-020-0040.]
Notes
Tables referenced are available from the agency.
Publications: Publications referenced are available from the agency.
Statutory/Other Authority: ORS 468.020 & 468A.070
Statutes/Other Implemented: ORS 468A
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