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###### Environmental Protection Agency

          - 40 CFR Part 52
          - [EPA-R08-OAR-2017-0339; FRL-9967-65-Region 8]

# AGENCY:

Environmental Protection Agency (EPA).

# ACTION:

Proposed rule.

# SUMMARY:

The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted to the EPA by the State of Montana. On September 19, 2016, the Governor of Montana's designee submitted a Clean Air Act (CAA) section 175A(b) second 10-year limited maintenance plan for the Missoula area for the carbon monoxide (CO) National Ambient Air Quality Standard (NAAQS). This limited maintenance plan addresses maintenance of the CO NAAQS for a second 10-year period beyond the original redesignation. This action is being taken under sections 110 and 175A of the CAA.

# DATES:

Comments must be received on or before October 16, 2017.

# ADDRESSES:

                        Submit your comments, identified by Docket ID No. EPA-R08-OAR-2017-0339 at                         *https://www.regulations.gov.*                         Follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from                         *www.regulations.gov.*                         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 (                        *i.e.,*                         on the web, cloud, or other file sharing system).                    

*Docket:*                         All documents in the docket are listed in the                         *www.regulations.gov*                         index. Publicly available docket materials are available either electronically in                         *www.regulations.gov*                         or in hard copy at the Air Program, Environmental Protection Agency (EPA), Region 8, 1595 Wynkoop Street, Denver, Colorado 80202-1129. The EPA requests that you contact the individual listed in the                         **FOR FURTHER INFORMATION CONTACT**                         section to view the hard copy of the docket. You may view the hard copy of the docket Monday through Friday, 8:00 a.m. to 4:00 p.m., excluding federal holidays. 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                         *http://www2.epa.gov/​dockets/​commenting-epa-dockets.*

# FOR FURTHER INFORMATION CONTACT:

                        Adam Clark, Air Program, EPA, Region 8, Mailcode 8P-AR, 1595 Wynkoop, Denver, Colorado 80202-1129, (303) 312-7104,                         *clark.adam@epa.gov.*

# SUPPLEMENTARY INFORMATION:

                    In the “Rules and Regulations” section of today's                     **Federal Register**                    , the EPA is approving Montana's SIP revision as a direct final rule without prior proposal because the Agency views this as a noncontroversial SIP revision and anticipates no adverse comments. A detailed rationale for the approval is set forth in the preamble to the direct final rule. If the EPA receives no adverse comments, the EPA will not take further action on this proposed rule. If the EPA receives adverse comments, the EPA will withdraw the direct final rule and it will not take effect. The EPA will address all public comments in a subsequent final rule based on this proposed rule. The EPA will not institute a second comment period on this action. Any parties interested in commenting must do so at this time. For additional information, see the direct final action, with the same title, that is located in the “Rules and Regulations” section of this issue of the                     **Federal Register**                    .                

Authority:42 U.S.C. 7401*et seq.*

      ( print page 43209)    
Dated: August 31, 2017. 

Debra H. Thomas,

Acting Regional Administrator, Region 8.

[FR Doc. 2017-19462 Filed 9-13-17; 8:45 am]

 BILLING CODE 6560-50-P