Air Plan Approval; Montana; Missoula, Montana, Air Rule Revisions

ENVIRONMENTAL PROTECTION AGENCY <CFR>40 CFR Part 52</CFR> <DEPDOC>[EPA-R08-OAR-2023-0472; FRL-12252-01-R8]</DEPDOC> <SUBJECT>Air Plan Approval; Montana; Missoula, Montana, Air Rule Revisions</SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Environmental Protection Agency (EPA). <HD SOURCE="HED">ACTION:</HD> Proposed rule. <SUM> <HD SOURCE="HED">SUMMARY:</HD> The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Montana on January 30, 2024, that incorporates revisions to the Missoula, Montana City-County Air Pollution Control (MCCAPC) program rules into the Montana SIP. The EPA is taking this action pursuant to the Clean Air Act (CAA). </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> Written comments must be received on or before October 17, 2024. </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> Submit your comments, identified by Docket ID No. EPA-R08-OAR-2023-0472, to the Federal Rulemaking Portal: <E T="03">https://www.regulations.gov.</E> Follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from <E T="03">https://www.regulations.gov.</E> The EPA may publish any comment received to its public docket. Do not submit electronically any information you consider to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Multimedia submissions (audio, video, etc.) must be accompanied by a written comment. The written comment is considered the official comment and should include discussion of all points you wish to make. The EPA will generally not consider comments or comment contents located outside of the primary submission ( <E T="03">i.e.,</E> on the web, cloud, or other file sharing system). For additional submission methods, the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit <E T="03">https://www2.epa.gov/dockets/commenting-epa-dockets.</E> <E T="03">Docket:</E> All documents in the docket are listed in the <E T="03">https://www.regulations.gov</E> index. Although listed in the index, some information is not publicly available, <E T="03">e.g.,</E> CBI or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, will be publicly available only in hard copy. Publicly available docket materials are available electronically in <E T="03">https://www.regulations.gov.</E> For this action we do not plan to offer hard copy review of the docket. Please email or call the person listed in the <E T="02">FOR FURTHER INFORMATION CONTACT</E> section if you need to make alternative arrangements for access to the docket. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> Joseph Stein, Air and Radiation Division, EPA, Region 8, Mailcode 8ARD-IO, 1595 Wynkoop Street, Denver, Colorado 80202-1129, telephone number: (303) 312-7078, email address: <E T="03">stein.joseph@epa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> Throughout this document wherever “we,” “us,” or “our” is used, we mean the EPA. <HD SOURCE="HD1">I. Background</HD> On January 30, 2024, the State of Montana submitted proposed revisions to the MCCAPC rules for incorporation into the Montana SIP. <SU>1</SU> <FTREF/> The MCCAPC rules address open burning, industrial and household combustors, and other activities that generate particulate matter emissions. The submittal was signed by the governor and went through a 30-day public comment period starting on Thursday, September 7, 2023, and ending on Monday, October 9, 2023. <SU>2</SU> <FTREF/> Montana received no requests for public hearing and all comments received were in favor of the revised MCCACP rules and their incorporation into the Montana SIP. In this action, we are proposing to approve certain revisions and to take no action on certain revisions, as described in greater detail below. <FTNT> <SU>1</SU>  See MDEQ Missoula Submission Receipt—01.30.24 in docket. </FTNT> <FTNT> <SU>2</SU>  See Montana January 30, 2024, submittal, p. 98. </FTNT> The EPA has reviewed the revisions to Chapters 1 through 9, and Chapters 13 and 14 of the MCCAPC rules. The bulk of the changes are administrative in nature, including formatting and grammatical corrections, conforming edits to create consistency across the MCCAPC, deletions of extraneous or repetitive content, removal of outdated references to a retired outdoor burn hotline, and similar edits. Additionally, there are several revisions that are substantive in nature, including new definitions for outdoor burning air pollution control technologies, provisions for the use of such control technologies, new limits on outdoor recreational fires, and the extension of wood stove rules to new areas around Missoula, among others. The EPA has determined that both the administrative and substantive revisions are consistent with the requirements of the CAA. These substantive revisions either have no effect on, or further restrict, particulate matter emissions. The EPA will not be acting on the rules submitted for revision in MCCAPC Chapter 10: <E T="03">Fuels</E> rules 10.102(1), 10.105(1), 10.109(1), 10.110, 10.111, 10.111(2). The EPA is proposing to act on the revisions in Chapter 10 in a separate action. <HD SOURCE="HD1">II. Proposed Action</HD> In this action, the EPA is proposing to approve the revisions to the MCCACP rules submitted by the State of Montana on January 30, 2024, listed below in table 1, Chapters 1 through 9 and Chapters 13 and 14. In the table below, the key is as follows: A— <E T="03">Approve.</E> N— <E T="03">No action.</E> <GPOTABLE COLS="3" OPTS="L2,nj,i1" CDEF="s75,r200,xls42"> <TTITLE>Table 1—Summary of Revisions to the Missoula City-County Air Pollution Control Program, Proposed for Approval</TTITLE> <CHED H="1"> Revisions to the Missoula City-County Air Pollution Control Program (MCCAPC)  <SU>1</SU> </CHED> <CHED H="2">MCCAPC chapter</CHED> <CHED H="2">MCCAPC rule(s): description of revision(s)</CHED> <ENT I="01">Chapter 1: Program Authority and Administration</ENT> <ENT>1.105(5): Grammatical correction</ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="01">Chapter 2: Definitions</ENT> <ENT>2.101(22): Update hazardous waste definition, consistency with state rule</ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>2.101(23): Removes Flathead Reservation from Impact Zone M definition (no MCCAC program jurisdiction on Flathead Reservation)</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>2.101(49): Grammatical correction</ENT> </ROW> <ROW> <ENT I="01">Chapter 3: Failure to Attain Standards</ENT> <ENT>3.101: Corrected wording</ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>3.103: Reference correction</ENT> </ROW> <ROW> <ENT I="01">Chapter 4: Missoula County, Air Stagnation and Emergency Episode Avoidance Plan</ENT> <ENT> 4.104(1-4): Formatting and spelling correction 4.108(1): Grammatical correction 4.108(2)(a): Corrected wording </ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>4.108(2)(d): Rule addition, requires recreational fires to comply with Chapter 7 applicable requirements and restrict fires in certain areas during air alerts</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>4.109(2)(d): Rule addition, requires recreational fires to comply with Chapter 7 applicable requirements and restrict fires in certain areas during air warnings</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>4.109(4): Formatting correction</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>4.113: Grammatical correction</ENT> </ROW> <ROW> <ENT I="01">Chapter 5: General Provisions</ENT> <ENT>5.108(1): MCCAPC board fee change clarification</ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>5.108(2): Removes extraneous content</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>5.111(1): Adds Montana state requirements for local air program rules into MCCAPC rules</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>5.111(2): Revision to create consistency with rule 5.111(1)</ENT> </ROW> <ROW> <ENT I="01">Chapter 6: Standards for Stationary (Industrial) Sources</ENT> <ENT>6.103(4): Revision allows for up to two, 12-month extensions on air quality permit when construction, installation or alteration was not completed within 36 months of initial issuance of air quality permit</ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>6.107(1): Punctuation correction</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>6.505(2): Formatting correction</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>6.604: Correction for consistency with state rules</ENT> </ROW> <ROW> <ENT I="01">Chapter 7: Outdoor Burning</ENT> <ENT>7.101(1-13): Renumbering to 7.101(3-15)</ENT> <ENT>A</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.101(1): Definition added for air curtain burners</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.101(2): Definition added for air curtain destructors</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.101(4): Removes references to outdoor burning hotline, department outdoor burning restrictions requirement remains</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.101(11): Clarification that recreational fires burning gaseous fuel are not considered outdoor burning</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.101(13): Punctuation correction</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.102(1): Pronoun correction</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.104(1): Removes wildland burning from year-round activities list and updates letters for consistency with the removal of point (a)</ENT> </ROW> <ROW> <ENT I="22"> </ENT> <ENT>7.104(4): Clarification and specification when prescribed woodlan ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 22k characters. 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