Utah Administrative Code
The Utah Administrative Code is the body of all effective administrative rules as compiled and organized by the Division of Administrative Rules (see Subsection 63G-3-102(5); see also Sections 63G-3-701 and 702).
NOTE: For a list of rules that have been made effective since January 1, 2020, please see the codification segue page.
NOTE TO RULEFILING AGENCIES: Use the RTF version for submitting rule changes.
R307. Environmental Quality, Air Quality.
Rule R307-410. Permits: Emissions Impact Analysis.
As in effect on January 1, 2020
Table of Contents
- R307-410-1. Purpose.
- R307-410-2. Definitions.
- R307-410-3. Use of Dispersion Models.
- R307-410-4. Modeling of Criteria Pollutant Impacts in Attainment Areas.
- R307-410-5. Documentation of Ambient Air Impacts for Hazardous Air Pollutants.
- R307-410-6. Stack Heights and Dispersion Techniques.
- Date of Enactment or Last Substantive Amendment
- Notice of Continuation
- Authorizing, Implemented, or Interpreted Law
This rule establishes the procedures and requirements for evaluating the emissions impact of new or modified sources that require an approval order under R307-401 to ensure that the source will not interfere with the attainment or maintenance of any NAAQS. The rule also establishes the procedures and requirements for evaluating the emissions impact of hazardous air pollutants. The rule also establishes the procedures for establishing an emission rate based on the good engineering practice stack height as required by 40 CFR 51.118.
(1) The following additional definitions apply to R307-410.
"Vertically Restricted Emissions Release" means the release of an air pollutant through a stack or opening whose flow is directed in a downward or horizontal direction due to the alignment of the opening or a physical obstruction placed beyond the opening, or at a height which is less than 1.3 times the height of an adjacent building or structure, as measured from ground level.
"Vertically Unrestricted Emissions Release" means the release of an air pollutant through a stack or opening whose flow is directed upward without any physical obstruction placed beyond the opening, and at a height which is at least 1.3 times the height of an adjacent building or structure, as measured from ground level.
(2) Except as provided in (3) below, the definitions of "stack", "stack in existence", "dispersion technique", "good engineering practice (GEP) stack height", "nearby", "excessive concentration", and "intermittent control system (ICS)" in 40 CFR 51.100(ff) through (kk) and (nn) are hereby incorporated by reference.
(3)(a) The terms "reviewing authority" and "authority administering the State implementation plan" shall mean the director.
(b) The reference to "40 CFR parts 51 and 52" in 40 CFR 51.100(ii)(2)(i) shall be changed to "R307-401, R307-403 and R307-405".
(c) The phrase "For sources subject to the prevention of significant deterioration program (40 CFR 51.166 and 52.21)" in 40 CFR 51.100(kk)(1) shall be replaced with the phrase "For sources subject to R307-401, R307-403, or R307-405".
All estimates of ambient concentrations derived in meeting the requirements of R307 shall be based on appropriate air quality models, data bases, and other requirements specified in 40 CFR Part 51, Appendix W, (Guideline on Air Quality Models), effective July 1, 2018, which is hereby incorporated by reference. Where an air quality model specified in the Guideline on Air Quality Models or other EPA approved guidance documents is inappropriate, the director may authorize the modification of the model or substitution of another model. In meeting the requirements of federal law, any modification or substitution will be made only with the written approval of the Administrator, EPA.
Prior to receiving an approval order under R307-401, a new source in an attainment area with a total controlled emission rate per pollutant greater than or equal to amounts specified in Table 1, or a modification to an existing source located in an attainment area which increases the total controlled emission rate per pollutant of the source in an amount greater than or equal to those specified in Table 1, shall conduct air quality modeling, as identified in R307-410-3, to estimate the impact of the new or modified source on air quality unless previously performed air quality modeling for the source indicates that the addition of the proposed emissions increase would not violate a National Ambient Air Quality Standard, as determined by the director.
TABLE 1 POLLUTANT EMISSIONS sulfur dioxide 40 tons per year oxides of nitrogen 40 tons per year PM10 - fugitive emissions 5 tons per year and fugitive dust PM10 - non-fugitive emissions 15 tons per year or non-fugitive dust carbon monoxide 100 tons per year lead 0.6 tons per year
(1) Prior to receiving an approval order under R307-401, a source shall provide documentation of increases in emissions of hazardous air pollutants as required under (c) below for all installations not exempt under (a) below.
(a) Exempted Installations.
(i) The requirements of R307-410-5 do not apply to installations which are subject to or are scheduled to be subject to an emission standard promulgated under 42 U.S.C. 7412 at the time a notice of intent is submitted, except as defined in (ii) below. This exemption does not affect requirements otherwise applicable to the source, including requirements under R307-401.
(ii) The director may, upon making a written determination that the delay in the implementation of an emission standard under R307-214-2, that incorporates 40 CFR Part 63, might reasonably be expected to pose an unacceptable risk to public health, require, on a case-by-case basis, notice of intent documentation of emissions consistent with (c) below.
(A) The director will notify the source in writing of the preliminary decision to require some or all of the documentation as listed in (c) below.
(B) The source may respond in writing within thirty days of receipt of the notice, or such longer period as the director approves.
(C) In making a final determination, the director will document objective bases for the determination, which may include public information and studies, documented public comment, the applicant's written response, the physical and chemical properties of emissions, and ambient monitoring data.
(b) Lead Compounds Exemption. The requirements of R307-410-5 do not apply to emissions of lead compounds. Lead compounds shall be evaluated pursuant to requirements of R307-410-4.
(c) Submittal Requirements.
(i) Each applicant's notice of intent shall include:
(A) the estimated maximum pounds per hour emission rate increase from each affected installation,
(B) the type of release, whether the release flow is vertically restricted or unrestricted, the maximum release duration in minutes per hour, the release height measured from the ground, the height of any adjacent building or structure, the shortest distance between the release point and any area defined as "ambient air" under 40 CFR 50.1(e), effective July 1, 2018, which is hereby incorporated by reference for each installation for which the source proposes an emissions increase,
(C) the emission threshold value, calculated to be the applicable threshold limit value - time weighted average (TLV-TWA) or the threshold limit value - ceiling (TLV-C) multiplied by the appropriate emission threshold factor listed in Table 2, except in the case of arsenic, benzene, beryllium, and ethylene oxide which shall be calculated using chronic emission threshold factors, and formaldehyde, which shall be calculated using an acute emission threshold factor. For acute hazardous air pollutant releases having a duration period less than one hour, this maximum pounds per hour emission rate shall be consistent with an identical operating process having a continuous release for a one-hour period.
TABLE 2 EMISSION THRESHOLD FACTORS FOR HAZARDOUS AIR POLLUTANTS (cubic meter pounds per milligram hour) VERTICALLY-RESTRICTED AND FUGITIVE EMISSION RELEASE POINTS DISTANCE TO PROPERTY BOUNDARY ACUTE CHRONIC CARCINOGENIC 20 Meters or less 0.038 0.051 0.017 21 - 50 Meters 0.051 0.066 0.022 51 - 100 Meters 0.092 0.123 0.041 Beyond 100 Meters 0.180 0.269 0.090 VERTICALLY-UNRESTRICTED EMISSION RELEASE POINTS DISTANCE TO PROPERTY BOUNDARY ACUTE CHRONIC CARCINOGENIC 50 Meters or less 0.154 0.198 0.066 51 - 100 Meters 0.224 0.244 0.081 Beyond 100 Meters 0.310 0.368 0.123
(ii) A source with a proposed maximum pounds per hour emissions increase equal to or greater than the emissions threshold value shall include documentation of a comparison of the estimated ambient concentration of the proposed emissions with the applicable toxic screening level specified in (d) below.
(iii) A source with an estimated ambient concentration equal to or greater than the toxic screening level shall provide additional documentation regarding the impact of the proposed emissions. The director may require such documentation to include, but not be limited to:
(A) a description of symptoms and adverse health effects that can be caused by the hazardous air pollutant,
(B) the exposure conditions or dose that is sufficient to cause the adverse health effects,
(C) a description of the human population or other biological species which could be exposed to the estimated concentration,
(D) an evaluation of land use for the impacted areas,
(E) the environmental fate and persistency.
(d) Toxic Screening Levels and Averaging Periods.
(i) The toxic screening level for an acute hazardous air pollutant is 1/10th the value of the TLV-C, and the applicable averaging period shall be:
(A) one hour for emissions releases having a duration period of one hour or greater,
(B) one hour for emission releases having a duration period less than one hour if the emission rate used in the model is consistent with an identical operating process having a continuous release for a one-hour period or more, or
(C) the dispersion model's shortest averaging period when using an applicable model capable of estimating ambient concentrations for periods of less than one hour.
(ii) The toxic screening level for a chronic hazardous air pollutant is 1/30th the value of the TLV- TWA, and the applicable averaging period shall be 24 hours.
(iii) The toxic screening level for all carcinogenic hazardous air pollutants is 1/90 the value of the TLV-TWA, and the applicable averaging period shall be 24 hours, except in the case of formaldehyde which shall be evaluated consistent with (d)(i) above and arsenic, benzene, beryllium, and ethylene oxide which shall be evaluated consistent with (d)(ii) above.
(1) The degree of emission limitation required of any source for control of any air pollutant to include determinations made under R307-401, R307-403 and R307-405, must not be affected by so much of any source's stack height that exceeds good engineering practice or by any other dispersion technique except as provided in (2) below. This does not restrict, in any manner, the actual stack height of any source.
(2) The provisions in R307-410-6 shall not apply to:
(a) stack heights in existence, or dispersion techniques implemented on or before December 31, 1970, except where pollutants are being emitted from such stacks or using such dispersion techniques by sources which were constructed or reconstructed, or for which major modifications were carried out after December 31, 1970; or
(b) coal-fired steam electric generating units subject to the provisions of Section 118 of the Clean Air Act, which commenced operation before July 1, 1957, and whose stacks were constructed under a construction contract awarded before February 8, 1974.
(3) The director may require the source owner or operator to provide a demonstration that the source stack height meets good engineering practice as required by R307-410-6. The director shall notify the public of the availability of the demonstration as part of the public notice process required by R307-401-7, Pubic Notice.
air pollution, modeling, hazardous air pollutant, stack height
November 25, 2019
May 15, 2017
For questions regarding the content or application of rules under Title R307, please contact the promulgating agency (Environmental Quality, Air Quality). A list of agencies with links to their homepages is available at http://www.utah.gov/government/agencylist.html or from http://www.rules.utah.gov/contact/agencycontacts.htm.