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| Montana Administrative Register Notice 17-323 | No. 19 10/13/2011 | |
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BEFORE THE BOARD OF ENVIRONMENTAL REVIEW OF THE STATE OF MONTANA
TO: All Concerned Person 1. On May 26, 2011, the Board of Environmental Review published MAR Notice No. 17-323 regarding a notice of public hearing on proposed amendment of the above-stated rules at page 799, 2011 Montana Administrative Register, issue number 10. 2. The board has amended ARM 17.8.820 and 17.8.822 exactly as proposed and has amended ARM 17.8.801, 17.8.804, 17.8.818, 17.8.825, 17.8.901, 17.8.904, and 17.8.1007 as proposed, but with the following changes, new matter underlined, stricken matter interlined: 17.8.801 DEFINITIONS (1) through (20)(b)(vii) remain as proposed. (21) The following apply to the definitions of the terms "major source baseline date" and "minor source baseline date": (a) "major source baseline date" means: (i) in the case of PM-10 and sulfur dioxide (SO2), January 6, 1975; (ii) in the case of nitrogen dioxide (NO2), February 8, 1988; and (iii) remains as proposed. (b) "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 regulation. The trigger date is: (i) in the case of PM-10 and sulfur dioxide (SO2), August 7, 1977; (ii) in the case of nitrogen dioxide (NO2), February 8, 1988; and (iii) through (26) remain as proposed. (27) The following apply to the definition of the term "significant": (a) "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: Pollutant and Emissions Rate Carbon monoxide: 100 tons per year (tpy) Nitrogen oxides: 40 tpy Sulfur dioxide (SO2): 40 tpy Particulate matter: 25 tpy of particulate matter emissions 15 tpy of PM-10 emissions PM-2.5: 10 tpy of direct PM-2.5 emissions, 40 tpy of sulfur dioxide (SO2) emissions, or 40 tpy of nitrogen dioxide (NO2) emissions unless demonstrated not to be a PM-2.5 precursor Ozone: 40 tpy of volatile organic compounds Lead: 0.6 tpy Fluorides: 3 tpy Sulfuric acid mist: 7 tpy Hydrogen sulfide (H2S): 10 tpy Total reduced sulfur (including H2S): 10 tpy Reduced sulfur compounds (including H2S): 10 tpy Municipal waste combustor organics (measured as total tetra- through octa-chlorinated dibenzo-p-dioxins and dibenzofurans): 3.2 * 10-6 megagrams per year (3.5 * 10-6 tpy) Municipal waste combustor metals (measured as particulate matter): 14 megagrams per year (15 tpy) Municipal waste combustor acid gases (measured as sulfur dioxide (SO2) and hydrogen chloride): 36 megagrams per year (40 tpy) (b) through (29) remain as proposed. 17.8.804 AMBIENT AIR INCREMENTS (1) In areas designated as Class I, II, or III, increases in pollutant concentration over the baseline concentration shall be limited to the following:
Particulate matter: PM-2.5, annual arithmetic mean................................................................................ 1 PM-2.5, 24-hr maximum............................................................................................. 2 PM-10, annual arithmetic mean................................................................................. 4 PM-10, 24-hr maximum.............................................................................................. 8 Sulfur dioxide (SO2): Annual arithmetic mean.............................................................................................. 2 24-hr maximum............................................................................................................ 5 3-hr maximum............................................................................................................ 25 Nitrogen dioxide (NO2): Annual arithmetic mean........................................................................................... 2.5
Particulate matter: PM-2.5, annual arithmetic mean................................................................................ 4 PM-2.5, 24-hr maximum............................................................................................. 9 PM-10, annual arithmetic mean............................................................................... 17 PM-10, 24-hr maximum............................................................................................ 30 Sulfur dioxide (SO2): Annual arithmetic mean............................................................................................ 20 24-hr maximum.......................................................................................................... 91 3-hr maximum.......................................................................................................... 512 Nitrogen dioxide (NO2): Annual arithmetic mean............................................................................................ 25
Particulate matter: PM-2.5, annual arithmetic mean................................................................................ 8 PM-2.5, 24-hr maximum........................................................................................... 18 PM-10, annual arithmetic mean............................................................................... 34 PM-10, 24-hr maximum............................................................................................ 60 Sulfur dioxide (SO2): Annual arithmetic mean............................................................................................ 40 24-hr maximum........................................................................................................ 182 3-hr maximum.......................................................................................................... 700 Nitrogen dioxide (NO2): Annual arithmetic mean............................................................................................ 50 (2) remains as proposed. 17.8.818 REVIEW OF MAJOR STATIONARY SOURCES AND MAJOR MODIFICATIONS--SOURCE APPLICABILITY AND EXEMPTIONS (1) through (6) remain as proposed. (7) The department may exempt a proposed major stationary source or major modification from the requirements of ARM 17.8.822, with respect to monitoring for a particular pollutant, if: (a) the emissions increase of the pollutant from a new stationary source or the net emissions increase of the pollutant from a modification would cause, in any area, air quality impacts less than the following amounts: (i) remains as proposed. (ii) nitrogen dioxide (NO2): 14 µg/m3, annual average; (iii) and (iv) remain as proposed. (v) sulfur dioxide (SO2): 13 µg/m3, 24-hour average; (vi) through (c) remain as proposed. 17.8.825 SOURCES IMPACTING FEDERAL CLASS I AREAS--ADDITIONAL REQUIREMENTS (1) through (3) remain as proposed. (4) The owner or operator of a proposed source or modification may demonstrate to the federal land manager that the emissions from such source would have no adverse impact on the air quality-related values of such lands (including visibility), notwithstanding that the change in air quality resulting from emissions from such source or modification would cause or contribute to concentrations which would exceed the maximum allowable increases for a Class I area. If the federal land manager concurs with such demonstration and so certifies to the department, the department may, provided that applicable requirements are otherwise met, issue the permit with such emission limitations as may be necessary to assure that emissions of sulfur dioxide (SO2), particulate matter, and nitrogen oxides would not exceed the following maximum allowable increases over the minor source baseline concentration for such pollutants:
PM-2.5 annual arithmetic mean............................................................................................... 4 24-hr maximum............................................................................................................ 9 Particulate matter: PM-10, annual arithmetic mean............................................................................... 17 PM-10, 24-hr maximum............................................................................................ 30 Sulfur dioxide (SO2): annual arithmetic mean............................................................................................. 20 24-hr maximum.......................................................................................................... 91 3-hr maximum.......................................................................................................... 325 Nitrogen dioxide (NO2): annual arithmetic mean............................................................................................. 25 (5) through (6) remain as proposed. 17.8.901 DEFINITIONS (1) through (15) remain as proposed. (16) "Precursor" means: (a) remains as proposed. (b) sulfur dioxide (SO2) in PM-2.5 nonattainment areas. (17) and (18) remain as proposed. (19) "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: Pollutant Emission Rate Carbon monoxide: 100 tons per year (tpy) Nitrogen oxides: 40 tpy Sulfur dioxide (SO2): 40 tpy Particulate matter: 25 tpy of particulate matter emissions or 15 tpy of PM-10 emissions PM-2.5 10 tpy of direct PM-2.5 emissions, 40 tpy of sulfur dioxide (SO2) emissions, or 40 tpy of nitrogen oxide emissions unless demonstrated not to be a PM-2.5 precursor Lead: 0.6 tpy (20) and (21) remain as proposed. 17.8.904 WHEN MONTANA AIR QUALITY PERMIT REQUIRED (1) and (2) remain as proposed. (3) Sulfur dioxide (SO2) is a precursor to PM-2.5 in a PM-2.5 nonattainment area. (4) through (7) remain as proposed. 17.8.1007 BASELINE FOR DETERMINING CREDIT FOR EMISSIONS AND AIR QUALITY OFFSETS (1) For the purposes of this subchapter, the following requirements apply: (a) through (d) remain as proposed. (e) In the case of emission offsets involving sulfur dioxide (SO2), particulates, and carbon monoxide, areawide mass emission offsets are not acceptable, and the applicant shall perform atmospheric simulation modeling to ensure that emission offsets provide a positive net air quality benefit. The department may exempt the applicant from the atmospheric simulation modeling requirement if the emission offsets provide a positive net air quality benefit, are obtained from an existing source on the same premises or in the immediate vicinity of the new source, and the pollutants disperse from substantially the same effective stack height; and (f) remains as proposed. 3. In order to make the rules more understandable, the board is making nonsubstantive revisions to the chemical nomenclature for sulfur dioxide and nitrogen dioxide as they appear in ARM 17.8.801, 17.8.804, 17.8.818, 17.8.825, 17.8.901, 17.8.904, and 17.8.1007. The board has inserted names of these chemical compounds with their shorthand chemical designations following in parentheses. The final rules will reflect these changes. 4. No public comments or testimony were received. Reviewed by: BOARD OF ENVIRONMENTAL REVIEW /s/ John F. North By: /s/ Joseph W. Russell JOHN F. NORTH JOSEPH W. RUSSELL, M.P.H. Rule Reviewer Chairman Certified to the Secretary of State, October 3, 2011.
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