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Federal Register / Vol. 86, No. 53 / Monday, March 22, 2021 / Rules and Regulations
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Contributing significantly to nonattainment of the NAAQS in another state prong 1;
Interfering with maintenance of the NAAQS in another state prong 2;
Interfering with measures that prevent significant deterioration of air quality in another state prong 3; and Interfering with measures that protect visibility in another state prong 4 or visibility transport.
We are only addressing the prong 4
element in this final approval. The prong 4 element is consistent with the requirements in the regional haze program, which explicitly require each state to address its share of emission reductions needed to meet the RPGs for surrounding Class I areas. The EPA most recently issued guidance that addressed prong 4 on September 13, 2013.49 The 2013 guidance indicates that a state can satisfy prong 4 requirements with a fully-approved regional haze SIP that meets 40 CFR 51.308 or 309.
Alternatively, in the absence of a fullyapproved regional haze SIP, a state may meet the prong 4 requirements through a demonstration showing that emissions within its jurisdiction do not interfere with another air agencys plans to protect visibility. Lastly, the guidance states that prong 4 is pollutant-specific, so infrastructure SIPs only need to address the particular pollutant including precursors for which there is a new or revised NAAQS for which the SIP is being submitted that is interfering with visibility protection.
On March 24, 2017, the State submitted a SIP revision that addressed all four infrastructure prongs from section 110a2Di for the 2008 lead Pb NAAQS, the 2006 and 2012 PM2.5
NAAQS, the 2008 O3 NAAQS, the 2010
SO2 NAAQS, and the 2010 NO2
NAAQS. We deferred taking action on the 110a2DiII prong 4 portion of that infrastructure SIP for a future rulemaking with the exception of the 2008 Pb NAAQS.50 On August 8, 2018, the State also included a discussion on visibility transport in its regional haze Phase II SIP revision, but we deferred taking action on the visibility transport requirements in that submittal too.51 In the Phase II SIP revision, the State considered all Class I areas in Arkansas and also considered those in Missouri, which is the only State that was 49 See Guidance on Infrastructure State Implementation Plan SIP Elements under CAA
sections 110a1 and 110a2 by Stephen D.
Page Sept. 13, 2013, pages 3235.
50 The EPA approved the visibility transport requirement for the 2008 Pb NAAQS only in the February 2018 final action effective March 16, 2018
see 83 FR 6470.
51 See 84 FR 51033, 51054 September 27, 2019.

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determined to potentially be impacted by sources from within Arkansas for the first implementation period. Missouri is currently not relying on emission reductions from Domtar in its regional haze plan. DEQ concluded that Missouri is on track to achieve its visibility goals;
that observed visibility progress from Arkansas sources are not interfering with Missouris RPG achievements for Hercules-Glades Wilderness and Mingo National Wildlife Refuge; and that no additional controls on Arkansas sources are necessary to ensure that other states Class I areas meet their visibility goals for the first planning period. On October 4, 2019, the State submitted the Arkansas 2015 O3 NAAQS Interstate Transport SIP revision to meet the requirements of CAA section 110a2D regarding interstate transport for the 2015 O3 NAAQS. In that SIP submittal, Arkansas also addressed the 2006 and 2012 PM2.5
NAAQS, the 2008 O3 NAAQS, the 2010
SO2 NAAQS, and the 2010 NO2 NAAQS
prong 4 visibility transport obligations in 110a2DiII, and we are finalizing approval of those prong 4
requirements in this action. The States prong 4 visibility transport analysis in the October 4, 2019 submittal supersedes the prong 4 visibility transport portion of the March 24, 2017, infrastructure SIP submittal and supplements the August 8, 2018, Phase II Arkansas Regional Haze SO2 and PM
SIP revision 52 for the 2006 and 2012
PM2.5 NAAQS, the 2008 and 2015 O3
NAAQS, the 2010 SO2 NAAQS, and the 2010 NO2 NAAQS. All other applicable infrastructure SIP requirements in the October 4, 2019, SIP submission have been or will be addressed in separate rulemakings.
II. Summary of Proposed Action and Our Final Decisions On March 16, 2020, we published a Notice of Proposed Rulemaking NPRM 53 proposing to approve the Arkansas Regional Haze Phase III SIP
revision submitted by DEQ on August 13, 2019. The SIP submittal addressed requirements of the Act and the Regional Haze Rule for visibility protection in mandatory Federal Class I
areas for the first implementation 52 See 83 FR 62204 November 30, 2018 for proposed approval and 84 FR 51033 September 27, 2019 for final action. The Arkansas Regional Haze SO2 and PM SIP revision addressed separate CAA
requirements related to interstate visibility transport under CAA section 110a2DiII, but we did not take action on that part of the submittal.
We are acting on the prong 4 portion of the Arkansas Regional Haze SO2 and PM SIP revision in this final action.
53 See March 16, 2020 proposed approval 85 FR
14847.

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period. The EPA proposed to approve an alternative measure to BART for SO2, PM, and NOX at the Domtar Ashdown Mill and elements of the SIP submittal that relate to these BART requirements at this facility. We are finalizing our determination in the NPRM that the Arkansas Regional Haze Phase III SIP
revision meets all of the applicable regional haze BART alternative provisions set forth in 40 CFR
51.308e2i to iv for the Domtar Ashdown Mill. We are also finalizing our approval of specific plantwide permit provisions as the enforceable mechanism for the BART alternative emission limits and conditions for implementing the BART alternative. We are finalizing our approval of the reasonable progress components under 40 CFR 51.308d relating to Domtar Power Boilers No. 1 and 2. With the final approval of the BART alternative requirements for the Domtar Ashdown Mill in this action, DEQ has satisfied all long-term strategy requirements under section 40 CFR 51.308d3. We also proposed to approve Arkansas consultation with FLMs and Missouri and our determination that the SIP
submittal satisfies the consultation requirements under 40 CFR 51.308i2
and 40 CFR 51.308d3i. We also agreed with DEQs determination that the revised 2018 RPGs in the Phase II
action do not need to be further revised.
We proposed to approve Arkansas request to withdrawal from the approved SIP the previously approved PM10 BART limit for Power Boiler No.
1. and the regional haze FIP provisions for the Domtar Ashdown Mill, and we are finalizing the withdrawal of those provisions in a separate rulemaking published elsewhere in this issue of the Federal Register.
The EPA also proposed to approve in its NPRM Arkansas interstate visibility transport provisions from the August 8, 2018, regional haze Phase II SIP
submittal as supplemented by the visibility transport provisions in the October 4, 2019, interstate transport SIP
submittal, which cover the following six NAAQS: The 2006 24-hour PM2.5
NAAQS; the 2012 annual PM2.5
NAAQS; the 2008 and 2015 eight-hour O3 NAAQS; the 2010 one-hour NO2
NAAQS; and the 2010 one-hour SO2
NAAQS. We are finalizing our approval of the prong 4 portions of these SIP
submittals addressing CAA section 110a2DiII for these NAAQS on the basis that with our approval of the Arkansas Regional Haze Phase III SIP
revision in this notice, Arkansas has a fully-approved regional haze SIP. The Arkansas Regional Haze NOX SIP

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