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Federal Register / Vol. 86, No. 53 / Monday, March 22, 2021 / Rules and Regulations
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units EGUs and the reasonable progress requirements with respect to NOX. These NOX provisions were previously disapproved by the EPA in our 2012 final action on the 2008
Arkansas Regional Haze SIP. The Arkansas Regional Haze NOX SIP
submittal replaced all source-specific NOX BART determinations for EGUs established in the FIP with reliance upon the Cross-State Air Pollution Rule CSAPR emissions trading program for O3 season NOX as an alternative to NOX
BART. The SIP submittal addressed the NOX BART requirements for Bailey Unit 1, McClellan Unit 1, Flint Creek Boiler No. 1, Lake Catherine Unit 4; White Bluff Units 1 and 2, and the Auxiliary Boiler. The revision did not address NOX BART for Domtar Ashdown Mill Power Boilers No. 1 and 2. On February 12, 2018, we took final action to approve the Arkansas Regional Haze NOX SIP revision and to withdraw the corresponding NOX provisions of the FIP.26
The State submitted its Phase II SIP
revision the Arkansas Regional Haze SO2 and PM SIP revision on August 8, 2018, that addressed most of the remaining parts of the 2008 Arkansas Regional Haze SIP that were disapproved in the March 12, 2012, action. The August 8, 2018, SIP
submittal was intended to replace the federal SO2 and PM10 BART
determinations as well as the reasonable progress determinations established in the FIP with the States own determinations. Specifically, the SIP
revision addressed the applicable SO2
and PM10 BART requirements for Bailey Unit 1; SO2 and PM10 BART
requirements for McClellan Unit 1; SO2
BART requirements for Flint Creek Boiler No. 1; SO2 BART requirements for White Bluff Units 1 and 2; SO2, NOX, and PM10 BART requirements for the White Bluff Auxiliary Boiler; 27 and included a requirement that Lake Catherine Unit 4 not burn fuel oil until SO2 and PM BART determinations for the fuel oil firing scenario are approved 26 See 82 FR 42627 September 11, 2017 for the proposed approval. See also 83 FR 5915 and 83 FR
5927 February 12, 2018 for the final action.
27 The Arkansas Regional Haze SO and PM SIP
2 revision established a new NOX emission limit of 32.2 pounds per hour pph for the Auxiliary Boiler to satisfy NOX BART and replaced the SIP
determination that we previously approved in our final action on the Arkansas Regional Haze NOX SIP
revision. In the Arkansas Regional Haze NOX SIP
revision, DEQ incorrectly identified the Auxiliary Boiler as participating in the CSAPR trading program for O3 season NOX to satisfy the NOX
BART requirements. The new source-specific NOX
BART emission limit that we approved in our final action on the Arkansas Regional Haze SO2 and PM
SIP revision corrected that error.

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into the SIP by the EPA.28 The submittal addressed the reasonable progress requirements with respect to SO2 and PM10 emissions for Independence Units 1 and 2 and all other sources in Arkansas. In addition, it established revised RPGs for Arkansas two Class I
areas and revised the States long-term strategy provisions. The submittal did not address BART and associated longterm strategy requirements for Domtar Ashdown Mill Power Boilers No. 1 and 2. On September 27, 2019, we took final action to approve a portion of the Arkansas Regional Haze SO2 and PM
SIP revision and to withdraw the corresponding parts of the FIP.29 30 The August 8, 2018, SIP also contained a discussion of the interstate visibility transport provisions, as discussed in more detail in Section I.H of this final action.
G. Arkansas Regional Haze Phase III SIP
Submittal On August 13, 2019, DEQ submitted the Arkansas Regional Haze Phase III
SIP revision Phase III SIP revision, which we are finalizing approval of in this action. This submittal contains an alternative measure to address BART
and the associated long-term strategy requirements for two subject-to-BART
sources Power Boilers No. 1 and 2 at the Domtar Ashdown paper mill located in Ashdown, Arkansas. Power Boiler No. 1 was first installed in 19671968.
At the time of SIP submittal and our proposed approval, the unit was 28 The 2012 action disapproved SO , NO , and 2
X PM BART for the fuel oil firing scenario for the Entergy Lake Catherine Plant Unit 4, but a FIP
BART determination was not established. Instead, the FIP included a requirement that Entergy not burn fuel oil at Lake Catherine Unit 4 until final EPA approval of BART determinations for SO2, NOX, and PM. In the Arkansas Regional Haze NOX
SIP revision, Arkansas relied on participation in CSAPR for O3 season NOX to satisfy the NOX BART
requirement for its subject-to-BART EGUs, including Lake Catherine Unit 4. When we took final action on the Arkansas Regional Haze NOX SIP
revision, we also took final action to withdraw the FIP NOX emission limit for the natural gas firing scenario for Lake Catherine Unit 4. In the Arkansas Regional Haze SO2 and PM SIP revision, Entergy committed to not burn fuel oil at Lake Catherine Unit 4 until final EPA approval of BART for SO2
and PM. This commitment was made enforceable by the State through an Administrative Order that was adopted and incorporated in the Arkansas Regional Haze SO2 and PM SIP revision.
29 See 83 FR 62204 November 30, 2018 for proposed action and 84 FR 51033 September 27, 2019 for final approval. The Arkansas Regional Haze SO2 and PM SIP revision also 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 interstate visibility transport portion of the Arkansas Regional Haze SO2 and PM SIP revision in this final action.
30 See 84 FR 51056 September 27, 2019 for the final withdrawal action.

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permitted to burn only natural gas.31 It was capable of burning a variety of other fuels too, including bark, wood waste, tire-derived fuel TDF, municipal yard waste, pelletized paper fuel, fuel-oil, and reprocessed fuel-oil, but was not authorized to do so. It was equipped with a wet electrostatic precipitator WESP 32 but the requirements to operate the WESP were removed when the permit was modified to combust natural gas only. In 2020, DEQ received a disconnection notice 33 for Power Boiler No. 1 and it is now permanently retired. Power Boiler No. 1 has a design heat input rating of 580 million British Thermal units per hour MMBtu/hr and an average steam generation rate of approximately 120,000 pounds per hour pph. Power Boiler No. 2 was installed in 1975 and is authorized to burn a variety of fuels including coal, petroleum coke, TDF, natural gas, wood waste, clean cellulosic biomass e.g.
bark, wood residuals, and other woody biomass materials, and wood chips used to absorb oil spills. It is equipped with a traveling grate; 34 a combustion air system that includes over-fire air; 35
multi-clones for PM10 removal; 36 and two venturi scrubbers in parallel for removal of SO2 and remaining particulates. Power Boiler No. 2 has a heat input rating of 820 MMBtu/hr and an average steam generation rate of approximately 600,000 pph.
DEQs original BART analyses and determinations dated October 2006 and March 2007 for Power Boilers No. 1
and 2 were included in the 2008
31 Power Boiler No. 1 operates as natural gas only subject to the Gas 1 subcategory defined under 40
CFR 63.7575. See DEQ Air Permit No. 0287AOP
R22 page 64 in the docket of this action.
32 An electrostatic precipitator is an air pollution control device that functions by electrostatically charging particles in a gas stream that passes through collection plates with wires. The ionized particulate matter is attracted to and deposited on the plates as the cleaner air passes through. A wet electrostatic precipitator is designed to operate with water vapor saturated air streams to remove liquid droplets such as sulfuric acid.
33 See November 18, 2020 Disconnection Notice from Domtar for Power Boiler No. 1 SN-03 in the docket of this action.
34 A traveling grate is a moving grate used to feed fuel to the boiler for combustion.
35 Over-fire air typically recirculates a portion of the flue gas back to both the fuel-rich zone and the combustion zone to achieve complete burnout by encouraging the formation of nitrogen N2 rather than NOX.
36 A cyclone separator is an air pollution control device shaped like a conical tube that creates an air vortex as air moves through it causing larger particles PM10 to settle as the cleaner air passes through. Multi-clones are a sequence of cyclone separators in parallel used to treat a higher volume of air. In this particular case, the cleaner air travels to the venturi scrubbers to remove the smaller remaining particles like PM2.5 and SO2.

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