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Federal Register / Vol. 86, No. 137 / Wednesday, July 21, 2021 / Proposed Rules
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On June 20, 2017, LDEQ submitted a SIP revision related to Entergys Nelson facility. On July 13, 2017, we proposed to approve that SIP revision along with the remaining portion of the February 2017 SIP revision that addressed SO2
and PM BART for the Nelson facility.26
Specifically, we proposed to approve the LDEQ SO2 and PM BART
determinations for Nelson Units 6 and 4, and the Unit 4 auxiliary boiler, and the AOC that makes the emission limits that represent SO2 and PM BART
permanent and enforceable for the purposes of regional haze. On August 24, 2017, we received a letter from LDEQ explaining their intent to revise the compliance date in the SIP revision for Nelson Unit 6 based on Entergys request for a three-year compliance deadline to achieve the proposed SO2
BART limit for Nelson Unit 6. On September 26, 2017, we supplemented our proposed approval of the SO2 BART
determination for Nelson by proposing to approve the three-year compliance date. On October 26, 2017, we received LDEQs final SIP revision addressing Nelson, including a final AOC with emission limits and a SO2 compliance date three years from the effective date of the EPAs final approval of the SIP
revision.
On December 21, 2017, EPA finalized approval 27 of the Louisiana Regional Haze SIP as meeting all applicable provisions of the CAA and EPA regional haze regulations. The final action approved the 2016 SIP revision,28 and the two 2017 SIP revisions 29 as supplemented with respect to 40 CFR
51.308e and addressed all deficiencies identified in our two previous June 7, 2012, and July 3, 2012, actions of the 2008 Louisiana Regional Haze SIP
submission. We finalized approval of the SO2, NOX, and PM BART
determinations for the subject-to-BART
non-EGU facilities Phillips 66
Company-Alliance Refinery, Mosaic, and Eco Services, LLC. We finalized our determination that the emission limits and operating conditions reflected in the AOCs between LDEQ
that proposal provided the basis for LDEQ to rely on CSAPR participation as an alternative to sourcespecific EGU BART for NOX.
26 82 FR 32294 July 13, 2017 Proposed approval for BART determination for Nelson Unit 6.
27 82 FR 60520 December 21, 2017, available at https www.regulations.gov/in docket EPAR06
OAR20170129. EPAs approval of these SIP
revisions became effective on January 22, 2018.
28 81 FR 74750 October 27, 2016. Proposed approval for the BART determinations for non-EGU
facilities.
29 82 FR 22936 May 19, 2017 Proposed approval for the BART determinations for EGU facilities and 82 FR 32294 July 13, 2017 Proposed approval for BART determination for Nelson Unit 6.

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and each non-EGU facility meet the BART requirements. We finalized the reliance upon CSAPR for NOX BART
requirements for subject-to-BART EGU
facilities. We finalized the SO2 and PM
BART determinations for the subject-toBART EGU facilities Cleco Brame Energy Center and five Entergy facilities: Waterford, Willow Glen, Ninemile, Little Gypsy, and Nelson. We finalized our determination that the emission limits and operating conditions listed in the various AOCs between LDEQ and each EGU facility meet the applicable BART requirements.
We finalized the following BART
eligible sources being approved as not subject-to-BART because their contribution to visibility impairment fell below the contribution threshold selected by the State: Terrebonne Parish Consolidated Government Houma Generating Station Houma, Louisiana Energy and Power Authority Plaquemine Steam Plant Plaquemine, Lafayette Utilities System Louis Doc Bonin Generating Station, Cleco Teche, Entergy Sterlington, NRG Big Cajun I, and NRG Big Cajun II. In addition, we approved the core requirements for regional haze SIPs found in 40 CFR
51.308d such as: The requirement to establish reasonable progress goals, the requirement to determine the baseline and natural visibility conditions, and the requirement to submit a long-term strategy; and the BART requirements for regional haze visibility impairment with respect to emissions of visibility impairing pollutants in 40 CFR
51.308e. The State fulfilled all outstanding obligations with respect to the Louisiana regional haze program for the first planning period.
C. Louisianas Regional Haze Progress Report SIP
Under 40 CFR 51.308g, each state was required to submit a progress report that evaluates progress towards the RPGs for each Class I area within and outside the state which may be affected by emissions from within the state. In addition, 40 CFR 51.308h requires states to submit, at the same time as the progress report, a determination of the adequacy of the states existing regional haze implementation plan.30 The 30 The Regional Haze Rule requires states to provide in the progress report an assessment of whether the current implementation plan is sufficient to enable the states to meet all established RPGs under 40 CFR 51.308g. The term implementation plan is defined for purposes of the Regional Haze Rule to mean any SIP, FIP, or Tribal Implementation Plan. As such, the Agency may consider measures in any issued FIP as well as those in a states regional haze plan in assessing the adequacy of the existing implementation plan under 40 CFR 51.308g and h.

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progress report for the first planning period is due five years after submittal of the initial regional haze SIP and must take the form of a SIP revision.
Louisiana submitted its initial regional haze SIP on June 13, 2008.
On March 25, 2021, Louisiana submitted its progress report to the EPA
in the form of a SIP revision under 40
CFR 51.308. As described in further detail in section II of this proposed rulemaking, to address the progress report requirements, the State provided:
1 A description of the status of measures in the approved regional haze SIP; 2 a summary of emission reductions achieved; 3 an assessment of visibility conditions for the one Class I area in Louisiana and for one Class I
area in Arkansas; 4 an analysis tracking the changes in emissions from sources and activities within the state;
5 an assessment of any significant changes in anthropogenic emissions within or outside the state that have limited or impeded progress in reducing pollutant emissions and improving visibility; 6 an assessment of whether the approved regional haze SIP elements and strategies are sufficient to enable the State and other states with Class I
areas affected by emissions from the state to meet all established RPGs; 7
a review of the States visibility monitoring strategy; and 8 a determination of adequacy of the existing implementation plan.
II. Evaluation of Louisianas Regional Haze Progress Report SIP Revision On March 25, 2021, the EPA received Louisianas periodic report on progress for the States regional haze SIP in the form of a SIP revision. That submission is the subject of this proposed approval.
The periodic report for the first implementation period assessed visibility progress toward the 2018 RPG
for the one Class I area in Louisiana and also assessed visibility progress for one Class I area in Arkansas affected by emissions from Louisiana. The recent data shows visibility improvement that is exceeding the visibility goals set for 2018 and emission trends indicate that SO2, NOX, and PM emissions have all been decreasing. The EPA is, therefore, proposing to approve Louisianas progress report on the basis that it satisfies the requirements of 40 CFR
51.308g and h, as explained in further detail in each subsequent section.
A. Class I Areas Louisiana has one Class I area within its borders that is addressed in the progress report: The Breton National
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