Utah Administrative Code
Topic - Environmental Quality
Title R307 - Air Quality
Rule R307-403 - Permits: New and Modified Sources in Nonattainment Areas and Maintenance Areas
Section R307-403-5 - Offsets: Particulate Matter Nonattainment Areas
Universal Citation: UT Admin Code R 307-403-5
Current through Bulletin 2024-06, March 15, 2024
(1) PM10 Nonattainment Areas.
(a) In addition to the general
offsetting requirements of
R307-403-4,
as they apply to new major sources and major modifications as defined in
R307-403-2(10)(b),
new sources which have a potential to emit, or modified sources which would
produce an emission increase equal to or exceeding the tonnage total of
combined PM10, sulfur dioxide, and oxides of nitrogen
listed below which are located in or impact a PM10
Nonattainment Area as defined in R307-403-5(1)(e), shall obtain an enforceable
offset as defined in R307-403-5(1)(b) and R307-403-5(1)(c).
(b) For a total of 50 tons/year or greater,
an offset established at a ratio of 1.2:1 of the emission increase is
required.
(c) For a total of 25
tons/year but less than 50 tons/year, an offset established at a ratio of 1:1
of the emission increase is required.
(d) For the offset determinations required in
R307-403-5(1) (b) or R307-403-5(1)(c), PM10, sulfur
dioxide, and oxides of nitrogen shall be considered on an equal basis. In areas
where offsets are also required for PM2.5, and/or ozone,
the most stringent emission offset ratio for oxides of nitrogen required by
R307-403 or R307-420 shall apply.
(e) For the purpose of determining whether
the owner or operator which proposes to locate a source outside a nonattainment
area is required to obtain offsets, the maximum allowable impact on any
nonattainment area is 1.0 microgram/cubic meter for a one-year averaging period
and 3.0 micrograms/cubic meter for a 24-hour averaging period for any
combination of PM10, sulfur dioxide and nitrogen
dioxide.
(2) PM2.5 Nonattainment Areas.
(a) In addition to the general offsetting
requirements of
R307-403-4,
new major sources or major modifications to existing sources which are located
in, or would impact a PM2.5 nonattainment area as
defined in
R307-403-3(1),
shall obtain an enforceable offset as defined in R307-403-5(2)(d) through
(f).
(b) a major source is:
(i) in a moderate nonattainment area, any
stationary source of air pollutants which emits or has the potential to emit
100 tons per year or more of direct PM2.5, or any
individual PM2.5 precursor as defined in
R307-403-1(4)(c).
(ii) in a serious nonattainment area, any
stationary source of air pollutants which emits or has the potential to emit 70
tons per year or more of direct PM2.5, or any individual
PM2.5 precursor as defined in
R307-403-1(4)(c).
(iii) any physical change that would occur at
a source not qualifying under R307-403-5(2)(b)(i) or R307-403-5(2)(b)(ii) as a
major source, if the change would constitute a major source by
itself.
(c) For the
purposes of determining what is a significant emission increase or a
significant net emission increase and therefore a major modification,
significant means a rate of emissions that would equal or exceed 10 tons per
year (tpy) of direct PM2.5, 40 tpy of sulfur dioxide, 40
tpy of nitrogen oxides, or 40 tpy of volatile organic compounds (VOC). In
PM2.5 nonattainment areas where ammonia has not been
exempted as a PM2.5 precursor, the rate of emissions
that is significant is specified in
R307-403-1(4)(b).
(d) Any increase in emissions that has been
determined to require offsets shall be offset at a ratio of no less than 1:1.
If the quantity of offsets is determined to be a non-whole number, the offset
required shall be rounded up to the next whole number.
(e) If offsetting requirements for
PM10 and/or ozone are also triggered, the most stringent
emission offset ratio required by R307-403 or R307-420 shall apply.
(f) Offsets may not be traded between
pollutants.
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