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###### Environmental Protection Agency

          - 40 CFR Part 52
          - [EPA-R07-OAR-2017-0267; FRL-9968-60-Region 7]

# AGENCY:

Environmental Protection Agency (EPA).

# ACTION:

Proposed rule.

# SUMMARY:

                        The Environmental Protection Agency (EPA) is proposing to approve elements of a State Implementation Plan (SIP) submission from the State of Iowa for the 2010 Sulfur Dioxide (SO2) National Ambient Air Quality Standard (NAAQS). Infrastructure SIPs address the applicable requirements of Clean Air Act (CAA) section 110, which requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each new or revised NAAQS promulgated by the EPA. These SIPs are commonly referred to as “infrastructure” SIPs. The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA.                    

                        In the “Rules and Regulations” section of this issue of the                         **Federal Register**                        , we are approving the state's SIP revisions as a direct final rule without a prior proposed rule. If we receive no adverse comment, we will not take further action on this proposed rule.                    

# DATES:

Comments must be received on or before October 30, 2017.

# ADDRESSES:

                        Submit your comments, identified by Docket ID No. EPA-R07-OAR-2017-0267, to                         *https://www.regulations.gov.*                         Follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from                         *Regulations.gov*. 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,                               ( print page 45551)                            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                         *https://www2.epa.gov/​dockets/​commenting-epa-dockets.*

# FOR FURTHER INFORMATION CONTACT:

                        Heather Hamilton, Air Planning and Development Branch, U.S. Environmental Protection Agency, Region 7, 11201 Renner Boulevard, Lenexa, KS 66219 at (913) 551-7039, or by email at                         *hamilton.heather@epa.gov.*

# SUPPLEMENTARY INFORMATION:

                    This document proposes to take direct final action on Iowa's infrastructure SIP submissions for the 2010 SO2                     NAAQS. We have published a direct final rule approving the State's SIP revision (s) in the “Rules and Regulations” section of this issue of the                     **Federal Register**                    , because we view this as a noncontroversial action and anticipate no relevant adverse comment. We have explained our reasons for this action in the preamble to the direct final rule. A detailed Technical Support Document (TSD) is included in this rulemaking docket to address the following: A description of Clean Air Act section 110(a)(1) and (2) infrastructure SIPs; the applicable elements under sections 110(a)(1) and (2); EPA's approach to the review of infrastructure SIP submissions, and EPA's evaluation of how Iowa addressed the relevant elements of sections 110(a)(1) and (2). If we receive no adverse comment, we will not take further action on this proposed rule. If we receive adverse comment, we will withdraw the direct final rule and it will not take effect. We would address all public comments in any subsequent final rule based on this proposed rule. We do not intend to institute a second comment period on this action. Any parties interested in commenting must do so at this time. For further information, please see the information provided in the                     **ADDRESSES**                     section of this document.                

#  List of Subjects in 40 CFR Part 52

      - Environmental protection
      - Air pollution control
      - Incorporation by reference
      - Intergovernmental relations
      - Sulfur dioxide
      - Reporting and recordkeeping requirements

Dated: September 20, 2017.

 Cathy Stepp,

Acting Regional Administrator, Region 7.

[FR Doc. 2017-20965 Filed 9-28-17; 8:45 am]

 BILLING CODE 6560-50-P