2015-18513. Approval and Promulgation of Implementation Plans; Wyoming; Revisions to SO2

AGENCY:

Environmental Protection Agency.

ACTION:

Proposed rule.

SUMMARY:

The Environmental Protection Agency (EPA) is proposing to approve changes to Wyoming's State Implementation Plan (SIP) that update its ambient air quality standards with regard to the 1-hour sulfur dioxide (SO₂) and the secondary SO₂ National Ambient Air Quality Standards (NAAQS). On February 7, 2014, the Wyoming Department of Environmental Quality (WDEQ) submitted to EPA revisions to the Wyoming SIP. Specifically, the State revised Wyoming Air Quality Standards and Regulations (WAQSR) Chapter 2, Section 4, “Ambient standards for sulfur oxides.” In this action, EPA is proposing to approve some of the revisions provided in the February 2014 SIP submission. This action is being taken in accordance with section 110 of the Clean Air Act (CAA).

DATES:

Written comments must be received on or before August 31, 2015.

ADDRESSES:

The EPA has established a docket for this action under Docket Identification Number EPA-R08-OAR-2014-0187. All documents in the docket are listed on the http://www.regulations.gov Web site. Although listed in the index, some information may not be publicly available, i.e., Confidential Business Information or other information the disclosure of which is restricted by statute. Certain other material, such as copyrighted material, is not placed on the Internet and will be publicly available only in the hard copy form. Publicly available docket materials are available either electronically through http://www.regulations.gov or in hard copy at EPA Region 8, Office of Partnership and Regulatory Assistance, Air Program, 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. The Regional Office's official hours of business are Monday through Friday, 8:00 a.m.-4:00 p.m., excluding federal holidays. An electronic copy of the State's SIP compilation is also available at http://www.epa.gov/​region8/​air/​sip.html.

Please see the Direct Final Rule which is located in the Rules Section of this Federal Register for detailed instruction on how to submit comments.

FOR FURTHER INFORMATION CONTACT:

Kevin Leone, Air Program, EPA, Region 8, Mailcode 8P-AR, 1595 Wynkoop Street, Denver, Colorado 80202-1129, [phone], [e-mail].

SUPPLEMENTARY INFORMATION:

In the “Rules and Regulations” section of this Federal Register, EPA is approving the State'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 EPA receives no adverse comments, EPA will take no further action on this proposed rule. If EPA receives adverse comments, EPA will withdraw the Direct Final Rule and it will not take effect. EPA will address all public comments in a subsequent final rule based on this proposed rule.

EPA will not 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 ADDRESSES section of this notice.

Please note that if EPA receives an adverse comment on a distinct provision of this rule and if that provision may be severed from the remainder of the rule, EPA may adopt as final those provisions of the rule that are not the subject of an adverse comment. See the information provided in the Direct Final action of the same title which is located in the Rules and Regulations Section of this Federal Register.

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

Dated: July 1, 2015.

Shaun L. McGrath,

Regional Administrator, Region 8.