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Federal Register / Vol. 86, No. 53 / Monday, March 22, 2021 / Rules and Regulations
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the six NAAQS previously mentioned.
Arkansas documented its apportionment of emission reduction obligations needed at the affected Class I areas in other states and provided a demonstration that the SIP includes approved federally enforceable measures that contribute to achieving the 2018 RPGs set for those areas.141
The demonstration showed that emissions within Arkansas jurisdiction do not interfere with other air agencies plans to protect visibility, as expressed via the 2018 reasonable progress goals for Class I areas in other states. In particular, Arkansas SIP submittals demonstrated that the RPGs for the only two Class I areas outside Arkansas potentially impacted by Arkansas emissions, Hercules-Glades Wilderness and Mingo National Wildlife Refuge, in Missouri, were achieving the visibility goals that were determined through interstate consultation. Further, the emissions from certain EGU sources in Arkansas are demonstrated to be below the levels Arkansas had agreed to in the interstate consultation process.
For these reasons, Arkansas has fulfilled its prong 4 visibility transport requirements for 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 in accordance with EPAs 2013
infrastructure SIP guidance. This alternative basis for approving these SIP
submittals is not dependent on Arkansas having a fully approved Regional Haze SIP for the first planning period, and it is not dependent on the emission reductions achieved by the BART alternative for the two BART
sources at Domtar Ashdown Mill. Thus, this basis for these prong 4 approvals is independent and severable from any other aspect of this action. Such approvals, on this basis, would not be affected by any administrative or judicial action altering, modifying, vacating, remanding, staying, or enjoining any other aspect of this action.
The commenters objections to EPA
approving reasonable progress requirements have been addressed in previous responses in this document.
F. Comments From Domtar Comment F.1: Overall the commenter agrees with EPAs summary of ADEQs BART Alternative for the Ashdown Mill, and further agrees that the BART
Alternative, by the clear weight of evidence, achieves greater reasonable progress than the FIP. Commenter supports EPAs determination that the 141 See
142 See March 16, 2020 proposed approval 85 FR
14847.

85 FR 14847, 14865.

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16:10 Mar 19, 2021

BART Alternative meets the applicable Regional Haze requirements and supports approving DEQs Regional Haze Phase III SIP submittal.
Commenter also agrees and supports EPAs determination that with this submittal ADEQ has satisfied all of the regional haze first planning period SIP
requirements for Domtar.
Response: We appreciate the commenters support of our proposed approval.
Comment F.2: The commenter believes a sufficient demonstration was made to grant an exemption under 40
CFR 51.303. However, for purposes of these comments, the commenter supports EPAs proposal with the reservation that it reserves the right to raise challenges to EPAs modeling approach in any effort to impose further reductions on the Ashdown Mill emissions in any subsequent Regional Haze SIP proceedings that may involve the Ashdown Mill.
Response: We appreciate the commenters support of our proposed approval. An exemption under 40 CFR
51.303 is outside the scope of this action.
Comment F.3: Two nonsubstantive corrections were suggested for consideration to make the proposed action record factually correct, but do not affect the BART alternative limits or conditions: 142
At 14851, middle column about two-thirds of the way down, referring to Power Boiler 1: It is equipped with a wet electrostatic precipitator. . . . It should be stated It was. . . . The wet electrostatic precipitator is no longer needed after the boiler was converted to burn natural gas.
At 14855, middle column just above Table 2, referring to the FIPs nitrogen oxide NOX BART determination for Power Boiler 2: . . . achieved by the installation and operation of low NOX
burners. The reference to low NOX
burners needs to be removed.
Response: The EPA agrees with commenters non substantive textual edits and the proposed SIP approval should read as follows:
At 14851, It is equipped with a wet electrostatic precipitator should be changed to read:
It was equipped with a wet electrostatic precipitator. With the conversion and permit modification to burn only natural gas, the wet electrostatic precipitator is no longer needed to control PM emissions from Power Boiler 1.

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At 14855, The NOX Best Available Retrofit Technology BART
determination for Power Boiler No. 2 is an emission limit of 345 pph on a thirty boiler-operating-day rolling average, achieved by the installation and operation of low NOX burners should be changed to read: The NOX BART
determination for Power Boiler No. 2 is an emission limit of 345 pph on a thirty boiler-operating-day rolling average consistent with the installation and operation of low NOX burners. see 81
FR 66332, 66348. A BART
determination is an emission limit based on the determination of a particular control strategy considering the BART factors, rather than a requirement to undertake the selected control.
These non-substantive textual edits do not impact our analysis and our final decision regarding approval of the BART alternative for Power Boilers No.
1 and 2.
IV. Final Action A. Arkansas Regional Haze Phase III SIP
Submittal We finalize approval of the Arkansas Regional Haze Phase III SIP revision submitted August 13, 2019 as meeting the applicable regional haze BART
alternative provisions set forth in 40
CFR 51.308e2 for the Domtar Ashdown Mill. Specifically, we finalize approval of the regional haze programspecific plantwide conditions 32 to 43
from section VI of permit revision 0287AOPR22 effective August 1, 2019 into the SIP for implementing the Domtar BART alternative. These plantwide conditions of permit 0287
AOPR22 143 include SO2, NOX, and PM10 emission limits and associated conditions for implementing these BART alternative limits for Power Boiler No. 1 and Power Boiler No. 2.
We finalize approval of the reasonable progress components under 40 CFR
51.308d1, to the extent they relate to Domtar Power Boilers No. 1 and 2. With the approved Phase I and II SIP revision requirements and the Arkansas Regional Haze Phase III BART alternative requirements being approved in this final action, Arkansas has addressed all reasonable progress requirements under 40 CFR51.308d1 with a fullyapproved regional haze SIP. We, 143 The permittee will continue to be subject to the conditions as approved into the SIP even if the conditions are revised as part of a permit amendment by DEQ until such time as EPA
approves any revised conditions into the SIP. The permittee shall remain subject to both the initial SIP-approved conditions and the revised SIP
conditions, unless and until EPA approves the revised conditions.

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