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Proposed Rules
Federal Register Vol. 86, No. 30
Wednesday, February 17, 2021

This section of the FEDERAL REGISTER
contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules.

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Parts 52 and 81
EPAR10OAR20200190; FRL10014
37Region 10

Air Plan Approval; ID: Logan UtahIdaho PM2.5 Redesignation to Attainment and Maintenance Plan Environmental Protection Agency EPA.
ACTION: Proposed rule.
AGENCY:

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FOR FURTHER INFORMATION CONTACT:

The Environmental Protection Agency EPA is proposing to redesignate the Idaho portion of the Logan, Utah-Idaho fine particulate matter PM2.5 nonattainment area Logan UT-ID NAA to attainment for the 2006 PM2.5 National Ambient Air Quality Standard NAAQS. EPA is also proposing to approve a maintenance plan for the area demonstrating continued compliance with the 2006
PM2.5 NAAQS through 2031, which the Idaho Department of Environmental Quality IDEQ submitted along with the redesignation request on September 13, 2019, for inclusion into the Idaho State Implementation Plan SIP.
Additionally, EPA is proposing to approve the 2031 motor vehicle emissions budgets included in Idahos maintenance plan for PM2.5, nitrogen oxides NOX and volatile organic compounds VOC. EPA is proposing this action pursuant to the Clean Air Act CAA or the Act.
DATES: Comments must be received on or before March 19, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPAR10
OAR20200190, at 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 electronically submit any information you consider to be Confidential Business Information CBI or other SUMMARY:

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information the disclosure of which 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. 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. 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
www.epa.gov/dockets/commenting-epadockets.
Adam Clark, 206 5531495, clark.adam@epa.gov.
SUPPLEMENTARY INFORMATION:
Throughout this document whenever we, us, or our is used, it is intended to refer to EPA.
Table of Contents I. Background II. Requirements for Redesignation to Attainment III. EPAs Analysis of Idahos Submittal A. Attainment Determination B. Applicable Requirements Under Section 110 and Part D of the CAA
1. CAA Section 110 General SIP
Requirements 2. Part D of Title I Requirements 3. Fully Approved SIP Under CAA Section 110k C. Improvement in Air Quality Due to Permanent and Enforceable Measures D. Fully Approved Maintenance Plan 1. Attainment Inventory 2. Maintenance Demonstration 3. Monitoring Network 4. Verification of Continued Attainment 5. Contingency Plan E. Requirements for Transportation Conformity and Motor Vehicle Emissions Budgets MVEBs IV. Proposed Action V. Statutory and Executive Order Reviews
I. Background On October 17, 2006 71 FR 61144, EPA revised the level of the 24-hour PM2.5 NAAQS, lowering the primary and secondary standards from the 1997
standard of 65 micrograms per cubic meter mg/m3 to 35 mg/m3. On November 13, 2009, EPA designated a portion of Franklin County, Idaho in addition to portions of Cache County,
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Utah nonattainment for the 2006 24hour PM2.5 NAAQS 74 FR 58688. This cross-boundary nonattainment area is referred to as the Logan, UT-ID PM2.5
NAA.
The boundaries of the Logan, UT-ID
PM2.5 NAA roughly conform to the geographic boundaries of the Cache Valley. The Cache Valley is an isolated, bowl-shaped valley measuring approximately 60 kilometers north to south and 20 kilometers east to west and almost entirely surrounded by mountain ranges. The Wellsville Mountains lie to the west, and on the east lie the Bear River Mountains; both are northern branches of the Wasatch Range. This topography can act as a barrier to air movement in the Cache Valley during temperature inversions, which occur in the winter months and are often the cause of elevated concentrations of fine particulates. Additional information pertaining to the unique issues associated with the Logan, UT-ID PM2.5
NAA and studies completed on inversions can be found in the docket for Utah and Idaho in the November 13, 2009, final designations action for the 2006 24-Hour PM2.5 NAAQS 74 FR
58688.
The nonattainment designation of the Logan UT-ID PM2.5 NAA required Idaho to prepare and submit an attainment plan to meet statutory and regulatory requirements in the Idaho portion of the Logan, UT-ID PM2.5 NAA.1 IDEQ
submitted this attainment plan to EPA
on December 14, 2012, and supplemented the attainment plan on December 24, 2014. The attainment plan addressed specific required elements, including but not limited to the following elements: Emissions inventory, Reasonably Available Control Measures/Technology RACM/RACT, attainment demonstration, contingency measures, and Motor Vehicle Emissions Budgets MVEBs. EPA approved the baseline emissions inventory on July 18, 2014 79 FR 41904 and the control measures on March 25, 2014 79 FR
16201. EPA approved the control measures in the attainment plan as meeting RACM/RACT and disapproved contingency measures on January 4, 2017 82 FR 729. EPA approved the attainment demonstration on August 8, 1 See part D of title I of the Clean Air Act and EPAs Fine Particulate Matter National Ambient Air Quality Standards: State Implementation Plan Requirements 72 FR 20586, April 25, 2007.

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