§ 52.2346 - Significant deterioration of air quality.

§ 52.2346 Significant deterioration of air quality.

(a) The Utah plan, as submitted, is approved as meeting the requirements of Part C, Title I, of the Clean Air Act, except that it does not apply to sources proposing to construct on Indian Reservations.

(b) Regulation for prevention of significant deterioration of air quality. The provisions of § 52.21 except paragraph (a)(1) are hereby incorporated and made a part of the Utah State implementation plan and are applicable to proposed major stationary sources or major modifications to be located on Indian Reservations.

(c) The State of Utah has clarified the generalized language contained in the Utah Air Conservation Regulations on the use of the “Guidelines on Air Quality Models.” In a letter to Douglas M. Skie, EPA, dated May 26, 1989, F. Burnell Cordner, Director of the Bureau of Air Quality, stated:

* * * The language in section 3.7 of the Utah Air Conservation Regulations on the use of “Guidelines on Air Quality Models” means that all PSD permit reviews will comply with the use of the “Guideline on Air Quality Models (Revised)”, EPA 450/2-78-027R, and any future supplements approved by EPA.

(d) On March 14, 2012 the State of Utah submitted revisions to the State Implementation Plan that incorporated the required elements of the 2008 PM_2.5 NSR Implementation Rule and the 2010 PM_2.5 Increment Rule. The following provisions are approved into the State Implementation Plan.

(1) Major source baseline date means:

(i) In the case of PM₁₀ and sulfur dioxide, January 6, 1975;

(ii) In the case of nitrogen dioxide, February 8, 1988; and

(iii) In the case of PM_2.5, October 20, 2010.

(2) Minor source baseline date means the earliest date after the trigger date on which a major stationary source or a major modification subject to 40 CFR 52.21 or to regulations approved pursuant to 40 CFR 51.166 submits a complete application under the relevant regulations. The trigger date is:

(i) In the case of PM₁₀ and sulfur dioxide, August 7, 1977;

(ii) In the case of nitrogen dioxide, February 8, 1988; and

(iii) In the case of PM_2.5, October 20, 2011.

(3) The baseline date is established for each pollutant for which increments or other equivalent measures have been established if:

(i) The area in which the proposed source or modification would construct is designated as attainment or unclassifiable under section 107(d)(1)(A)(ii) or (iii) of the Act for the pollutant on the date of its complete application under 40 CFR 52.21 or under regulations approved pursuant to 40 CFR 51.166; and

(ii) In the case of a major stationary source, the pollutant would be emitted in significant amounts, or in the case of a major modification, there would be a significant net emissions increase of the pollutant.

(4) Baseline area means any intrastate area (and every part thereof) designated as attainment or unclassifiable under section 107(d)(1)(A)(ii) or (iii) of the Act in which the major source or major modification establishing the minor source baseline date would construct or would have an air quality impact for the pollutant for which the baseline date is established, as follows: equal to or greater than 1 µg/m³ (annual average) for SO₂, NO₂, or PM₁₀; or equal or greater than 0.3 µg/m³ (annual average) for PM_2.5.

(5) Area redesignations under section 107(d)(1)(A)(ii) or (iii) of the Act cannot intersect or be smaller than the area of impact of any major stationary source or major modification which:

(i) Establishes a minor source baseline date; or

(ii) Is subject to 40 CFR 52.21 or [Utah Administrative Code (UAC)] R307-405 and would be constructed in the same state as the state proposing the redesignation.

(6) Significant means, in reference to a net emissions increase or the potential of a source to emit any of the following pollutants, a rate of emissions that would equal or exceed any of the following rates:

(i) Carbon monoxide: 100 tons per year (tpy).

(ii) Nitrogen oxides: 40 tpy.

(iii) Sulfur dioxide: 40 tpy.

(iv) Particulate matter: 25 tpy of particulate matter emissions.

(v) PM₁₀: 15 tpy.

(vi) PM_2.5: 10 tpy of direct PM_2.5 emissions; 40 tpy of sulfur dioxide emissions; 40 tpy of nitrogen oxide emissions unless demonstrated not to be a PM_2.5 precursor under 40 CFR 52.21(b)(50).

(vii) Ozone: 40 tpy of volatile organic compounds or nitrogen oxides.

(viii) Lead: 0.6 tpy.

(ix) Fluorides: 3 tpy.

(x) Sulfuric acid mist: 7 tpy.

(xi) Hydrogen sulfide (H₂S): 10 tpy.

(xii) Total reduced sulfur (including H₂S): 10 tpy.

(xiii) Reduced sulfur compounds (including H₂S): 10 tpy.

(xiv) Municipal waste combustor organics (measured as total tetra-through octa-chlorinated diebenzo-p-dioxins and dibenzofurans): 3.2 × 10^M6 megagrams per year (3.5 × 10^M6 tons per year).

(xv) Municipal waste combustor metals (measured as particulate matter): 14 megagrams per year (15 tons per year).

(xvi) Municipal waste combustor acid gases (measured as sulfur dioxide and hydrogen chloride): 36 megagrams per year (40 tons per year).

(xvii) Municipal solid waste landfills emissions (measured as nonmethane organic compounds): 45 megagrams per year (50 tons per year).

(7) Regulated NSR pollutant, for purposes of this section means the following:

(i) Any pollutant for which a national ambient air quality standard has been promulgated and any pollutant identified under 40 CFR 52.21(b)(50)(i) as a constituent or precursor for such pollutant. Precursors identified by the EPA Administrator for purposes of NSR are the following:

(A) Volatile organic compounds and nitrogen oxides are precursors to ozone in all attainment and unclassifiable areas.

(B) Sulfur dioxide is a precursor to PM_2.5 in all attainment and unclassifiable areas.

(C) Nitrogen oxides are presumed to be precursors to PM_2.5 in all attainment and unclassifiable areas, unless the State demonstrates to the EPA Administrator's satisfaction or EPA demonstrates that emissions of nitrogen oxides from sources in a specific area are not a significant contributor to that area's ambient PM_2.5 concentrations.

(D) Volatile organic compounds are presumed not to be precursors to PM_2.5 in any attainment or unclassifiable area, unless the State demonstrates to the EPA Administrator's satisfaction or EPA demonstrates that emissions of volatile organic compounds from sources in a specific area are a significant contributor to that area's ambient PM_2.5 concentrations.

(ii) Any pollutant that is subject to any standard promulgated under section 111 of the Act;

(iii) Any Class I or II substance subject to a standard promulgated under or established by title VI of the Act;

(iv) Any pollutant that otherwise is subject to regulation under the Act.

(v) Notwithstanding 40 CFR 52.21(b)(50)(i) through (iv), the term regulated NSR pollutant shall not include any or all hazardous air pollutant either listed in section 112 of the Act, or added to the list pursuant to section 112(b)(2) of the Act, and which have not been delisted pursuant to section 122(b)(3) of the Act, unless the listed hazardous air pollutant is also regulated as a constituent or precursor of a general pollutant listed under section 108 of the Act.

(vi) Participate matter (PM) emissions, PM_2.5 emissions and PM₁₀ emissions shall include gaseous emissions from a source or activity which condense to form particulate matter at ambient temperatures. On or after January 1, 2011 (or any earlier date established in the upcoming rulemaking codifying test methods), such condensable particulate matter shall be accounted for in applicability determinations and in establishing emissions limitations for PM, PM_2.5 and PM₁₀ in PSD permits. Compliance with emissions limitations for PM, PM_2.5 and PM₁₀ issued prior to this date shall not be based on condensable particular matter unless required by the terms and conditions of the permit or the applicable implementation plan. Applicability determinations made prior to this date without accounting for condensable particular matter shall not be considered in violation of this section unless the applicable implementation plan required condensable particular matter to be included.

(8) Ambient air increments.

(i) In areas designated as Class I, II, or III, increases in pollutant concentration over the baseline concentration shall be limited to the following:

Pollutant	Maximum allowable increase (micrograms per cubic meter)
Class I Area
PM2.5:
Annual arithmetic mean	1
24-hr maximum	2
PM10:
Annual arithmetic mean	4
24-hr maximum	8
Sulfur dioxide:
Annual arithmetic mean	2
24-hr maximum	5
3-hr maximum	25
Nitrogen dioxide Annual arithmetic mean	2.5
Class II Area
PM2.5:
Annual arithmetic mean	4
24-hr maximum	9
PM10:
Annual arithmetic mean	17
24-hr maximum	30
Sulfur dioxide:
Annual arithmetic mean	20
24-hr maximum	91
3-hr maximum	512
Nitrogen dioxide Annual arithmetic mean	25
Class III Area
PM2.5:
Annual arithmetic mean	8
24-hr maximum	18
PM10:
Annual arithmetic mean	34
24-hr maximum	60
Sulfur dioxide:
Annual arithmetic mean	40
24-hr maximum	182
3-hr maximum	700
Nitrogen dioxide Annual arithmetic mean	50

(ii) For any period other than an annual period the applicable maximum allowable increase may be exceeded during one such period per year at any one location.

[47 FR 6428, Feb. 12, 1982, as amended at 54 FR 27881, July 3, 1989; 68 FR 11324, Mar. 10, 2003; 68 FR 74490, Dec. 24, 2003; 78 FR 63886, Oct. 25, 2013]