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Federal Register / Vol. 86, No. 30 / Wednesday, February 17, 2021 / Proposed Rules 2017 82 FR 37025. We also approved a separate, March 20, 2018, Idaho SIP
revision as meeting applicable part D
nonattainment new source review NSR
requirements on August 20, 2018 83 FR
42033.2 Most recently, we approved the attainment plan as meeting the Reasonable Further Progress RFP, Quantitative Milestone QM, and MVEB requirements on February 20, 2020 85 FR 9664.
On September 8, 2017 82 FR 42447, EPA granted two, one-year extensions, under CAA section 188d, to the December 31, 2015 Moderate attainment date for the 2006 24-hour PM2.5 Logan, UT-ID NAA. On October 19, 2018, EPA
finalized a determination that the Logan, UT-ID PM2.5 NAA had attained the 2006 primary and secondary 24hour PM2.5 NAAQS Determination of Attainment by the December 31, 2017, attainment date 83 FR 52983.
Additionally, EPA finalized a determination that the obligation to submit any remaining attainmentrelated SIP revisions arising from classification of the Logan, UT-ID NAA
as Moderate under subpart 4 of part D
of title I of the Act for the 2006 24hour PM2.5 NAAQS are not applicable for so long as the area continues to attain the 2006 24-hour PM2.5 NAAQS.
See 40 CFR 51.1015a known as a Clean Data Determination or CDD.
II. Requirements for Redesignation to Attainment The CAA provides the requirements for redesignating a nonattainment area to attainment. Specifically, section 107d3E of the CAA, 42 U.S.C.
7407d3E, allows for redesignation provided that: 1 EPA determines that the area has attained the applicable NAAQS; 2 EPA has fully approved the applicable implementation plan for the area under section 110k of the CAA;
3 EPA determines that the improvement in air quality is due to
permanent and enforceable reductions in emissions resulting from implementation of the applicable SIP
and applicable federal air pollutant control regulations and other permanent and enforceable reductions; 4 EPA has fully approved a maintenance plan for the area as meeting the requirements of section 175A of the CAA; and 5 the state containing such area has met all requirements applicable to the area under section 110 and part D of the CAA. In this proposed action, EPA will review CAA section 107d3E
requirements 2 and 5 together as part of our evaluation of Idahos redesignation request.
EPA has provided guidance on redesignation in the General Preamble, 3 and has provided further guidance on processing redesignation requests in the following documents: 1
Procedures for Processing Requests to Redesignate Areas to Attainment, Memorandum from John Calcagni, Director, Air Quality Management Division, September 4, 1992 hereafter the Calcagni Memo; 2 State Implementation Plan SIP Actions Submitted in Response to Clean Air Act CAA Deadlines, Memorandum from John Calcagni, Director, Air Quality Management Division, October 28, 1992;
and 3 Part D New Source Review Part D NSR Requirements for Areas Requesting Redesignation to Attainment, Memorandum from Mary D. Nichols, Assistant Administrator for Air and Radiation, October 14, 1994.
These documents are included in the Docket for this proposed action.
III. EPAs Analysis of Idahos Submittal EPA is proposing to redesignate the Franklin County, ID portion of the Logan UT-ID NAA to attainment for the 2006 24-hour PM2.5 NAAQS and proposing to approve into the Idaho SIP
the associated maintenance plan. EPAs proposed approval of the redesignation
request and maintenance plan is based upon EPAs determination that the area continues to attain the 2006 24-hour PM2.5 NAAQS and that all other redesignation criteria have been met for the area. The following is a description of how Idahos September 13, 2019, submittal satisfies the requirements of section 107d3E of the CAA for the 2006 24-hour PM2.5 standard.
A. Attainment Determination To redesignate an area from nonattainment to attainment, the CAA
requires EPA to determine that the area has attained the applicable NAAQS
CAA section 107d3Ei. Whether an area has attained the 2006 24-hour PM2.5 NAAQS is based upon measured air quality levels at each eligible monitoring site with a complete threeyear period to produce a design value equal to or below 35 mg/m3. See 40 CFR
part 50 and 40 CFR part 50, appendix N. A state must demonstrate that an area has attained the 2006 24-hour PM2.5
NAAQS through submittal of ambient air quality data from an ambient air monitoring network representing maximum PM2.5 concentrations. The data must be quality assured, qualitycontrolled and certified in the EPAs Air Quality System AQS and it must show that the three-year average of valid PM2.5
98th percentile mass concentrations is equal to or below the 2006 24-hour PM2.5 NAAQS 35 mg/m3, pursuant to 40 CFR 50.13. In making this showing, three consecutive years of complete air quality data must be used.
As noted, on October 19, 2018, EPA
finalized a Determination of Attainment for the Logan, UT-ID PM2.5 NAA based upon quality-assured and certified ambient air quality monitoring data for the period of 20152017 83 FR 52983.
The monitoring data used as the basis for the Determination of Attainment under CAA section 188b2 is provided in Table 1 of this document.

TABLE 1LOGAN UT-ID AREA DESIGN VALUES FROM 2018 CDD 4
98th percentile value g/m3
Monitor
20152017
design value
AQS site ID
2015

Smithfield, UT
Franklin, ID

490050007
160410001

2016

a 28.9

2017
34.0
33.3

18.8

36.0

a 33

b 38.3

b 30

jbell on DSKJLSW7X2PROD with PROPOSALS

a This
value combines monitor data from the Logan, UT and Smithfield, UT monitors. EPA concurred on exceptional events in the October 19, 2018 83 FR 52983 action and the specified data was excluded.
b This value includes 1-in-3 day monitoring frequency from January 1August 9, 2017, and daily monitoring frequency from August 10December 31, 2017.

2 Idahos submission incorporated by reference EPAs August 24, 2016 81 FR 58010 rule changes to 40 CFR 51.165 promulgated under CAA subpart 4, part D.

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3 See State Implementation Plans; General Preamble for the Implementation of Title I of the Clean Air Act Amendments of 1990, 57 FR 13498, April 16, 1992.

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4 See
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83 FR 52983, October 19, 2018.

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