[Federal Register Volume 85, Number 229 (Friday, November 27, 2020)]
[Rules and Regulations]
[Pages 75860-75874]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-23994]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R08-OAR-2015-0463; FRL-10015-75-Region 8]


Approval and Promulgation of Air Quality Implementation Plans; 
Utah; Regional Haze State and Federal Implementation Plans

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: The Environmental Protection Agency (EPA) is finalizing 
approval of State Implementation Plan (SIP) revisions submitted by the 
State of Utah on July 3, 2019, as supplemented on December 3, 2019, to 
satisfy certain regional haze requirements for the regional haze 
program's first implementation period (Utah SIP revisions). The EPA is 
approving the Utah SIP revision that provides an alternative to best 
available retrofit technology (BART) controls for nitrogen oxides 
(NOX) at the PacifiCorp Hunter and Huntington power plants. 
The EPA finds that the NOX BART Alternative for Hunter and 
Huntington achieves greater reasonable progress toward natural 
visibility conditions than BART, in accordance with the requirements of 
the Clean Air Act (CAA) and the EPA's Regional Haze Rule. In 
conjunction with this approval, we are withdrawing the Federal 
Implementation Plan (FIP) that addresses NOX BART for the 
Hunter and Huntington power plants that EPA promulgated in 2016. The 
EPA is also approving Utah's December 3, 2019 SIP supplement that 
requires reporting of all deviations from compliance with the 
applicable requirements under particulate matter (PM) BART and the 
NOX BART Alternative, including the emission limits for 
Hunter and Huntington. The EPA is taking these actions pursuant to 
sections 110 and 169A of the CAA.

DATES: This rule is effective on December 28, 2020.

ADDRESSES: The EPA has established a docket for this action under 
Docket ID No. EPA-R08-OAR-2015-0463. All documents in the docket are 
listed on the https://www.regulations.gov website. Although listed in 
the index, some information is not publicly available, e.g., CBI or 
other information whose disclosure is restricted by statute. Certain 
other material, such as copyrighted material, is not placed on the 
website and will be publicly available only in hard copy form. Publicly 
available docket materials are available through https://www.regulations.gov, or please call or email the person identified in 
the FOR FURTHER INFORMATION CONTACT section for additional availability 
information.

FOR FURTHER INFORMATION CONTACT: Aaron Worstell, Air and Radiation 
Division, EPA, Region 8, Mailcode 8ARD-IO, 1595 Wynkoop Street, Denver, 
Colorado 80202-1129, (303) 312-6073, [email protected].

SUPPLEMENTARY INFORMATION: 
    Throughout this document wherever ``we,'' ``us,'' or ``our'' is 
used, we mean the EPA.

Table of Contents

I. Proposed Action and the EPA's Conclusion
II. Public Comments and EPA Responses
    A. Legal Issues
    B. BART Alternative Requirements
    C. BART Alternative ``Greater Reasonable Progress'' 
Determination
III. The EPA's Final Action
    A. 2019 Utah Regional Haze SIP Revisions
    B. FIP Withdrawal
    C. Clean Air Act Section 110(l)
IV. Incorporation by Reference
V. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review and 
Executive Order 13563: Improving Regulation and Regulatory Review
    B. Executive Order 13771: Reducing Regulations and Controlling 
Regulatory Costs
    C. Paperwork Reduction Act
    D. Regulatory Flexibility Act
    E. Unfunded Mandates Reform Act (UMRA)
    F. Executive Order 13132: Federalism
    G. Executive Order 13175: Consultation and Coordination with 
Indian Tribal Governments
    H. Executive Order 13045: Protection of Children from 
Environmental Health Risks and Safety Risks
    I. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use
    J. National Technology Transfer and Advancement Act
    K. Executive Order 12898: Federal Actions To Address 
Environmental Justice in Minority Populations and Low-Income 
Populations
    L. Determination Under Section Clean Air Act Section 307(d)
    M. Congressional Review Act (CRA)
    N. Judicial Review

I. Proposed Action and the EPA's Conclusion

    On July 5, 2016, the EPA promulgated a final rule titled 
``Approval, Disapproval, and Promulgation of Air Quality Implementation 
Plans; Partial Approval and Partial Disapproval of Air Quality 
Implementation Plans and Federal Implementation Plan; Utah; Revisions 
to Regional Haze State Implementation Plan; Federal Implementation Plan 
for Regional Haze,'' which approved, in part, a regional haze SIP 
revision submitted by the State of Utah on June 4, 2015.\1\ In the July 
2016 final rule, the EPA also disapproved, in part, the Utah regional 
haze SIP submission, including the NOX BART Alternative 
(also ``BART Alternative'' or ``Alternative'') for Hunter Units 1 and 2 
and Huntington Units 1 and 2, which are BART units as explained in more 
detail below. The BART Alternative relied on sulfur dioxide 
(SO2), NOX, and PM emission reductions from the 
2015 closure of PacifiCorp's Carbon power plant, as well as 
NOX reductions achieved through combustion control upgrades 
at Hunter Units 1, 2 and 3 and Huntington Units 1 and 2, which were 
installed in 2006-2014 (Hunter Unit 3 is not a BART unit). The 
combustion control upgrades for Hunter Units 1 and 2 and Huntington 
Units 1 and 2 include an Alstom TSF 2000TM low-
NOX firing system and two elevations of separated overfire 
air (SOFA). The combustion upgrades for Hunter Unit 3 include upgraded 
low-NOX burners (LNB) and overfire air (OFA). Concurrent 
with disapproving the NOX BART Alternative, EPA promulgated 
a FIP in the July 2016 final rule that imposed a NOX BART 
emission limit of 0.07 lb/MMBtu (30-day rolling average) for each of 
the four BART units based on the emission reductions achievable through 
the installation and operation of selective-catalytic reduction (SCR) 
plus upgraded combustion controls.
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    \1\ 81 FR 43894 (July 5, 2016).
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    On July 3, 2019, Utah submitted a revised SIP that, based on new 
technical information and a different regulatory test, seeks to 
demonstrate that the previously submitted NOX BART 
Alternative achieves greater reasonable progress than BART. The SIP 
revision also includes amendments to Utah's SO2 milestone 
reporting requirements under the SO2 Backstop Trading 
Program pursuant to 40 CFR 51.309 such that SO2 emission 
reductions resulting from the closure of the Carbon plant are not 
counted under both the SO2 Backstop Trading Program and the 
NOX BART Alternative. On January 22, 2020, the EPA proposed 
to approve the State's July 3, 2019 SIP revision based on this new 
information.\2\ Specifically, we

[[Page 75861]]

proposed to incorporate the following into Utah's SIP:
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    \2\ 85 FR 3558 (Jan. 22, 2020).
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     A NOX emission limit of 0.26 lb/MMBtu (30-day 
rolling average) each for Hunter Units 1 and 2 and Huntington Units 1 
and 2.
     A NOX emission limit of 0.34 lb/MMBtu (30-day 
rolling average) for Hunter Unit 3.
     A requirement to permanently close and cease operation of 
the Carbon power plant by August 15, 2015.
     The associated amendments to the SO2 milestone 
reporting requirements.
    Because approval of the NOX BART Alternative satisfies 
Utah's BART obligation for Hunter Units 1 and 2 and Huntington Units 1 
and 2, we also proposed to withdraw the FIP for NOX BART at 
these units. In particular, we proposed to find that the NOX 
BART Alternative would achieve greater reasonable progress towards 
natural visibility conditions than would be achieved through the 
installation and operation of BART at Hunter Units 1 and 2 and 
Huntington Units 1 and 2 under EPA's 2016 FIP.
    The EPA also proposed to approve a December 3, 2019 SIP supplement 
to the July 3, 2019 SIP revision that includes monitoring, 
recordkeeping, and reporting (MRR) requirements for the units subject 
to the NOX BART Alternative and PM BART. The supplement also 
includes amendments that require each source to submit a report of any 
deviation from applicable emission limits and operating practices, 
including deviations attributable to upset conditions, the probable 
cause of such deviations, and any corrective actions or preventive 
measures taken.
    Finally, contingent on our approval of these two SIP revisions, we 
proposed to find that Utah's SIP fully satisfies the requirements of 
section 309 of the Regional Haze Rule and that, therefore, the State 
has fully complied with the requirements for reasonable progress, 
including BART, for the first implementation period.
    EPA requested comment on its proposed approval of Utah's regional 
haze SIP elements related to the NOX BART Alternative under 
40 CFR 51.309(d)(4)(vii) and 51.308(e)(2) and (3), as well as the MRR 
elements for the units subject to that BART Alternative and to PM BART. 
EPA previously approved Utah's regional haze SIP as meeting all other 
requirements of 40 CFR 51.309,\3\ and we neither reopened nor requested 
comment on previously approved elements.
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    \3\ See 77 FR 74355 (Dec. 14, 2012); 81 FR 43894 (July 5, 2016).
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    The EPA conducted a public hearing for our proposed action in 
Price, Utah on February 12, 2020. Our public comment period closed on 
March 23, 2020.
    Our January 2020 proposed rule provided background on the 
requirements of the CAA and EPA's Regional Haze Rule, a summary of Utah 
regional haze SIP submittals and related EPA actions, and the EPA's 
rationale for its proposed action. That background information and 
rationale will not be restated here. For the reasons stated in the 
proposed rule, this document, and in the accompanying Response to 
Comments (RTC) document, the EPA concludes that Utah's NOX 
BART Alternative achieves greater reasonable progress under 40 CFR 
51.308(e)(2) and (3).

II. Public Comments and EPA Responses

    We received both written and oral comments at the public hearings 
we held in Price, Utah. We also received comments through the internet 
and mail. The full text of comments received from these commenters is 
included in the publicly posted docket associated with this action at 
https://www.regulations.gov. Our RTC document, which is also included 
in the docket associated with this action, provides detailed responses 
to all significant comments received except for those addressed 
below.\4\ Our RTC document is organized similarly to the structure 
presented in this section. Therefore, if additional information is 
desired concerning how we addressed a particular comment, the reader 
should refer to the appropriate section in our RTC document.
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    \4\ Most commenter citations and footnotes are excluded from 
this document.
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    PacifiCorp, conservation organizations (HEAL Utah, Sierra Club, 
National Parks Conservation Association, Utah Physicians for a Healthy 
Environment, and Natural Resources Defense Council), Edison Electric 
Institute, Ute Mountain Ute Tribe, and Salt Lake City's Capitol Hill 
Action Group submitted detailed written comments. Many general comments 
were made at the public hearing.

A. Legal Issues

    Comment summary: Some commenters argued that the modeling 
assumptions used for comparing the BART Benchmark (the controls 
required by the 2016 FIP) \5\ to the NOX BART Alternative 
overstated emissions for non-BART units in the BART Benchmark scenario. 
Specifically, the commenters argued that emissions for the Carbon plant 
should have reflected compliance with the Mercury and Air Toxics 
Standards (MATS) rule, which was required by April 15, 2015. According 
to the commenters, compliance with MATS would have resulted in a 
greater than 50 percent reduction in SO2 emissions at Carbon 
Units 1 and 2 compared to its historical emissions. Additionally, the 
commenters argued that emissions from Hunter Unit 3 in the BART 
Benchmark scenario should have reflected combustion controls installed 
in 2007. The modeling instead assumed that under this scenario, the 
Carbon plant and Hunter Unit 3 would emit pollutants consistent with 
the 2001-2003 baseline.\6\ The commenters argued that such assumption 
overstates the emissions from these sources that would have occurred 
under the BART Benchmark and thus understates the visibility benefits 
that would occur under the BART Benchmark.
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    \5\ As described above, in the July 2016 FIP, EPA determined 
that NOX BART for each of the four BART units constituted 
an emission limit of 0.07 lb/MMBtu (30-day rolling average) based on 
the emission reductions achievable through the installation and 
operation of SCR plus upgraded combustion controls. Utah's July 2019 
SIP submittal thus refers to the BART Benchmark controls as the 
``EPA FIP,'' as do many of the commenters. While the controls 
represented by the BART Benchmark and EPA's 2016 FIP are indeed the 
same, the relevant comparison for this action is between the BART 
Benchmark and the NOX BART Alternative. 40 CFR 
51.308(e)(2); see also 85 FR 3572. We therefore refer to the 2016 
FIP as the BART Benchmark as appropriate in this document, the 
preamble to the proposed rule, and the RTC document.
    \6\ See 85 FR 3568.
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    Response: Utah's modeling of emissions at Carbon and Hunter Unit 3 
under the NOX BART Alternative and the BART Benchmark is 
reasonable and authorized under the EPA's regulations for BART 
alternatives. In particular, assuming continued emissions from sources 
that would not be subject to BART controls in the BART Benchmark 
scenario, when such emissions would be eliminated under the BART 
Alternative, is simply a necessary analytical step for making a proper 
comparison of the two scenarios to determine which achieves ``greater 
reasonable progress.'' \7\ This is authorized by the Regional Haze 
Rule, and it is consistent with the EPA's prior regulatory actions, EPA 
guidance, and case law.
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    \7\ 40 CFR 51.308(e).

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[[Page 75862]]

    First, Hunter Unit 3 and the Carbon Units are not BART sources.\8\ 
Accordingly, reductions from these sources should not be included in 
determining emissions reductions from the BART Benchmark under 40 CFR 
51.308(e)(2)(i)(C). Hunter Unit 3 and the Carbon Units are covered by 
Utah's BART Alternative, however, and thus emissions reductions from 
these sources properly are attributed to the BART Alternative under 40 
CFR 51.308(e)(2)(i)(D). Were the EPA to include these same emission 
reductions in the BART Benchmark scenario, even though there would have 
been no enforceable obligation that they occur under that scenario, a 
proper comparison of the relative degree of visibility improvement 
between the two scenarios would not be possible.
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    \8\ See 85 FR 3559; 81 FR 43895; Utah Air Quality Board, ``Utah 
State Implementation Plan Section XX,'' June 24, 2019, pages 28-29.
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    Furthermore, Utah properly applied a 2001-2003 baseline to 
calculate emissions reductions under both scenarios. Pursuant to 40 CFR 
51.308(e)(2)(iv), a state's SIP must demonstrate that emissions 
reductions resulting from an alternative measure will be surplus to 
those reductions resulting from measures adopted to meet requirements 
of the CAA ``as of the baseline date of the SIP.'' In promulgating the 
Regional Haze Rule in 1999, we explained that the ``baseline date of 
the SIP'' in this context means ``the date of the emissions inventories 
on which the SIP relies,'' \9\ which is defined as 2002 for regional 
haze purposes.\10\ Any measure adopted after 2002 is accordingly 
``surplus'' under 40 CFR 51.308(e)(2)(iv). Indeed, in 2002, the EPA 
designated the baseline date of all regional haze SIPs as 2002.\11\ The 
EPA explained that ``[p]rogress in improving visibility is tracked from 
baseline conditions (established using air quality monitoring for the 
2000-2004 period). If 2002 is used as the base year for planning 
purposes, then States can take credit for emission reductions that are 
achieved before the 2007-2008 SIP due date.'' \12\
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    \9\ 64 FR 35714, 35742 (July 1, 1999).
    \10\ 70 FR 39104, 39143 (July 6, 2005).
    \11\ See Memorandum dated November 18, 2002, from Lydia Wegman 
and Peter Tsirigotis, Subject: ``2002 Base Year Emission Inventory 
SIP Planning: 8-hr Ozone, PM2.5, and Regional Haze 
Programs.''
    \12\ Id. at 3. The first regional haze SIPs were due December 
17, 2007. See 40 CFR 51.308(b).
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    In other words, for purposes of calculating emissions reductions 
from BART alternatives, states assume a baseline of 2002 emissions and 
may take credit for emissions reductions after that date, even if those 
reductions occur as a result of, or to comply with, other CAA 
requirements, so long those requirements occur after that baseline. 
Thus, Utah's modeling properly credited emissions reductions from 
Carbon's 2015 shutdown and Hunter 3's 2007 controls towards the BART 
Alternative. Furthermore, in order to properly compare the BART 
Benchmark to the NOX BART Alternative under 51.308(e)(2) to 
determine if the Alternative achieves greater reasonable progress, 
common sense dictates that the EPA must compare emissions reductions 
under each scenario from the same baseline year. Thus, Utah's modeling 
also properly included Carbon and Hunter 3's emissions from the 2001-
2003 baseline period (i.e., not including any reductions from MATS 
compliance or 2007 controls) under the BART Benchmark because Carbon 
and Hunter 3 are not BART sources.
    This approach is supported by case law.\13\ In Yazzie v. EPA, the 
United States Court of Appeals for the Ninth Circuit reviewed and 
upheld EPA's FIP, which included a BART alternative instead of 
BART.\14\ The petitioners argued that the EPA inconsistently credited 
the BART alternative, but not the BART benchmark, for emissions 
reductions from controls voluntarily installed in 2009-2011 for 
purposes of comparing the two.\15\ Like here, the EPA used a 2001-2003 
baseline from which to calculate emissions reductions under both 
scenarios for purposes of the comparison.\16\ The Ninth Circuit deemed 
this approach reasonable under 40 CFR 51.308(e)(3).\17\ Likewise, 
Utah's approach here with respect to Hunter 3 and Carbon is reasonable.
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    \13\ See Utility Air Regulatory Group v. EPA, 885 F.3d. 714 
(D.C. Cir. 2018); Yazzie v. EPA, 851 F.3d 960 (9th Cir. 2017).
    \14\ 851 F.3d at 975.
    \15\ 851 F.3d at 974.
    \16\ Id.
    \17\ See id.
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    Commenters additionally argue that the State cannot take credit for 
the portion of the reductions from the Carbon shutdown that would have 
happened anyway had Carbon remained in operation but in compliance with 
the MATS rule. However, as the D.C. Circuit has recognized, EPA's 
regulations allow for BART alternatives even when the reductions are 
due to compliance with another CAA requirement. In UARG v. EPA, the 
United States Court of Appeals for the District of Columbia Circuit 
reviewed and upheld the EPA's rule finding that emission reductions 
attributable to the 2011 Cross-State Air Pollution Rule (CSAPR)--
implemented under the ``good neighbor'' provision of the Act, CAA 
section 110(a)(2)(D)(i)(I)--may be treated as a BART alternative. The 
petitioners there argued that the EPA should not have compared BART on 
its own (i.e., without CSAPR in place) to the BART alternative on its 
own (i.e., CSAPR without BART in place), but should have instead 
compared BART plus CSAPR to CSAPR, because CSAPR (like the MATS rule 
here), was implemented under a separate provision of the CAA and would 
go into effect regardless of BART.\18\ The D.C. Circuit rejected the 
petitioners' argument as effectively requiring more of BART 
alternatives than the EPA's rule requires. The court explained that 
under the Regional Haze Rule, the EPA properly compares BART without 
the alternative or other CAA requirements to the alternative without 
BART.\19\ Underlying that holding is the fact that EPA's regulations 
authorize BART alternatives to take advantage of emission reductions 
achieved to meet some other CAA requirement so long as they are surplus 
to requirements as of the baseline.\20\ Thus, as in UARG, the EPA here 
properly compared the BART Benchmark without MATS compliance at Carbon 
to the NOX BART Alternative.
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    \18\ UARG, 885 F.3d at 720.
    \19\ See id.
    \20\ See 40 CFR 51.308(e)(2)(i)(C), (e)(2)(iv). See also UARG, 
885 F.3d at 719, 720 (finding challenge to EPA's BART alternative 
regulations to be time-barred).
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    This approach is also consistent with other EPA actions. See, e.g., 
79 FR 39322, 39325 (July 10, 2014) (approving Connecticut's use of 
emissions reductions from post-2002 regulations as surplus that could 
be credited to its BART alternative); 77 FR 34218, 34219 (June 11, 
2012) (approving Indiana's credit to its BART alternative for 
reductions from a non-BART source); 78 FR 57487, 57489-91 (Sept. 19, 
2013) (approving Massachusetts' comparison of the BART benchmark and 
the BART alternative from a common 2002 baseline, and approving the 
state's use of emissions reductions from post-2002 regulations as 
surplus that could be credited to its BART alternative); 79 FR 33438, 
33441-42 (June 11, 2014) (approving Washington's credit to its BART 
alternative for reductions achieved through controls installed post-
2002 in order to meet other CAA requirements).
    In sum, in this final action approving Utah's NOX BART 
Alternative, the EPA finds that Utah properly compared the BART 
Benchmark to the BART Alternative, using its modeling of the emissions 
reductions of each without the other from the 2001-2003 baseline 
period, consistent with the Regional

[[Page 75863]]

Haze Rule, its regulatory history, EPA guidance, and case law.
    Comment summary: Some commenters argued that there are three legal 
flaws with Utah's treatment of SO2 emissions reductions from 
the Carbon plant shutdown. As explained in the preamble to the proposed 
rule, Utah's SIP revision continues to report historical emissions for 
the Carbon plant in annual milestone reports for the SO2 
Backstop Trading Program to ensure that SO2 emissions 
reductions from the Carbon shutdown are not double-counted towards the 
NOX BART Alternative and the SO2 Backstop Trading 
Program. First, the commenters argued that the approach violates 40 CFR 
51.309(d)(4)(iii)'s requirement that reporting under the SO2 
Backstop Trading Program include ``actual'' emissions. Second, the 
commenters argued that the approach violates 40 CFR 51.309(d)(4)(i), 
which requires that participating states use the same compliance 
methodology during the first two years of the Program. Finally, the 
commenters argued that removing Carbon from the SO2 Backstop 
Trading Program would undermine and potentially nullify the EPA's 
approval of that Program because the Program's inclusion of sources 
like Carbon was an underpinning of the EPA's approval.
    Response: The EPA disagrees with this comment and the incorporated 
2016 comments by the National Park Service. First, 40 CFR 
51.309(d)(4)(iii)'s requirement that SIPs include provisions requiring 
``annual reporting of actual stationary source SO2 
emissions'' must be read in context with the following sentence that 
such ``data must be sufficient to determine annually whether the 
milestone for each year through 2018 is achieved.'' \21\ The provision 
goes on to require that the participating states submit the data to the 
EPA and the regional planning organization and that the data be kept 
for at least 10 years. Thus, read in context, Sec.  51.309(d)(4)(iii) 
plainly is meant to require reporting that allows a determination of 
whether the milestones have been met.\22\ Utah's approach to reporting 
Carbon's emissions under the SO2 Backstop Trading Program 
serves this purpose because Utah will overstate actual emissions under 
the Program. This conservative approach ensures that the reported data 
are sufficient to determine whether the SO2 milestone is 
achieved and is therefore consistent with and achieves the purpose of 
the provision, and the EPA finds it approvable.
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    \21\ 40 CFR 51.309(d)(4)(iii).
    \22\ See 64 FR 35751-52 (``Section 51.309(d)(4) requires 
monitoring and reporting of stationary source emissions of 
SO2 in order to assess compliance with these milestones 
during the period 2003 to 2018.'').
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    As explained in the proposal, the participating states first 
achieved the 2018 milestone (the most stringent milestone) in 2011 when 
Carbon was fully operational. Between 2011 and Carbon's shutdown in 
2015, emissions continued to stay below the 2018 milestone and 
decreased significantly each year. The most recent milestone report, 
for 2016, demonstrates that SO2 emissions were 36 percent 
lower than the 2018 milestone.\23\ At its highest reported 
SO2 emissions level, Carbon's emissions made up only 10 
percent of the participating states' three-year average SO2 
emissions (reported in 2014).\24\ Thus, even with the additional 
emissions from Carbon, the participating states can easily achieve the 
2018 milestone, and overstating Utah's emissions for purposes of the 
SO2 Backstop Trading Program will not impair any 
determination of compliance with the milestones.
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    \23\ 85 FR 3570.
    \24\ Id. at Table 6.
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    Second, Utah's approach does not violate 40 CFR 51.309(d)(4)(i). As 
an initial matter, the commenters selectively quote the provision. The 
complete sentence reads, ``[d]uring the first two years of the program, 
compliance with the milestone may be measured by a methodology of the 
States' choosing, so long as all States in the program use the same 
methodology.'' \25\ The SO2 Backstop Trading Program was 
approved in 2012, which is more than two years ago.\26\ Thus, this 
sentence is no longer applicable.
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    \25\ 40 CFR 51.309(d)(4)(i) (emphasis added).
    \26\ See 77 FR 73926 (Dec. 12, 2012).
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    Instead, after the first two years of the Program, Sec.  
51.309(d)(4)(i) requires that participating states measure compliance 
by comparing ``a three-year rolling average of actual emissions with a 
rolling average of the emissions milestones for the same three years.'' 
Utah's SIP revision remains consistent with this methodology. Under 
this methodology, each state reports its own emissions.\27\ As 
explained above, using this methodology, the participating states 
achieved the 2018 milestone in 2011, and emissions are currently 36 
percent below the 2018 milestone.\28\ Accordingly, Wyoming and New 
Mexico are not prejudiced by Utah's continued reporting of the Carbon 
emissions, nor do they have any reason to amend their SIPs to account 
for Carbon's emissions. Indeed, the EPA approved a similar SIP revision 
for units in Wyoming in 2019.\29\ Utah's approach is consistent with 
Sec.  51.309(d)(4)(i) and with the other states' methodologies.
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    \27\ See Utah Admin. Code R307-250-9(8); WY Rules and 
Regulations 020.0002.14 Sec.  2(h)(viii); New Mexico Admin. Code 
20.2.81.106(O) and 20.11.46.16(H) (all requiring quarterly and 
annual reports).
    \28\ 85 FR 3570 (Table 6).
    \29\ See 84 FR 22711, 22712, 22715 (May 20, 2019) (requiring 
Basin Electric to use inflated emission rates to calculate and 
report emissions from two units for the SO2 Backstop 
Trading Program to ensure SO2 emissions are not double 
counted for the SO2 Program and the BART alternative).
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    Finally, Utah's approach does not undermine or nullify the EPA's 
approval of the SO2 Backstop Trading Program. In approving 
the Program as better than BART, the EPA relied on the fact that the 
Program, including the 2018 SO2 emissions milestone, covered 
63 non-BART sources, including Carbon.\30\ It hardly undermines the 
EPA's approval that one of the sources that was included in the Program 
has now shut down. The Program was designed to encourage sources to 
reduce emissions so that the emissions milestones were and are never 
exceeded.\31\ In any case, Utah has not removed Carbon from the 
Program, but rather has decided to continue counting its emissions at 
historical levels towards the 2018 milestone, even though the source is 
now actually emitting at zero. That is, emissions from Carbon remain 
covered by the SO2 Backstop Trading Program. Even accounting 
for Carbon's historical emissions, the participating states' 
SO2 emissions are far below the 2018 milestone and there is 
no indication that the 2018 milestone will ever be exceeded such that 
emissions under the Program would exceed projected emissions under 
BART, thereby rendering the Program less effective than BART.
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    \30\ 77 FR 30953, 30965 (May 24, 2012).
    \31\ 77 FR 74360. Participating states must continue to meet the 
2018 milestone until the Program is replaced with an EPA-approved 
SIP revision. See also 40 CFR 51.309(d)(4)(vi)(A).
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    Even it if was the case that Utah had removed Carbon from the 
SO2 Backstop Trading Program, however, the inclusion of non-
BART units like Carbon was just one of several reasons the EPA deemed 
the Program better than BART. Additional reasons included: (1) The 
trading program discouraged emissions from new sources more effectively 
than under BART; (2) the trading program included an aggregate cap on 
emissions, which decreased emissions more effectively than BART; and 
(3) the trading program encouraged earlier reductions than under 
BART.\32\ The Tenth Circuit upheld the EPA's considerations as ``a 
reasonable basis for

[[Page 75864]]

the EPA's approval of the 309 program.'' \33\ Accordingly, Utah's 
continued accounting of the Carbon emissions in the SO2 
Backstop Trading Program, which arguably affects just one part of the 
EPA's rationale in a proportionally minor way (1/63), cannot possibly 
undermine or nullify the EPA's approval.
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    \32\ See 77 FR 30965; 77 FR 73927.
    \33\ WildEarth Guardians v. EPA, 770 F.3d 919, 935 (10th Cir. 
2014).
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    Finally, as noted above, Carbon has not been removed from the 
Program as the commenters contend. Rather, as explained above, Carbon's 
emissions continue to be included in the inventory of annual emissions 
notwithstanding the fact that it is shut down.\34\ Thus, SO2 
emissions remain capped at the 2018 milestone, including Carbon's 
emissions. To the extent it may become necessary, future SO2 
reductions would have to come from other sources in order to allow the 
participating states to continue to meet the 2018 milestone.
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    \34\ See 85 FR 3574.
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    Comment summary: Some commenters assert that the EPA may not 
approve the NOX BART Alternative because the NOX 
BART Alternative would allow increased emissions limits and visibility 
impairment without offsetting increased emissions elsewhere in Utah's 
SIP in violation of CAA section 110(l), 42 U.S.C. 7410(l). The 
commenters argue that case law supports an interpretation of CAA 
section 110(l) that prevents implementation plan revisions that would 
increase overall air pollution limits or worsen air quality. The 
commenters argue that the EPA's approval of the NOX BART 
Alternative and withdrawal of the FIP would violate CAA section 110(l) 
for two specific reasons. First, the commenters assert that the 
NOX BART Alternative would increase emissions limits and 
resulting NOX pollution compared to the FIP. They argue that 
the EPA's proposed analysis and conclusion that increased 
NOX emissions will not interfere with applicable CAA 
requirements is ``woefully insufficient to support compliance with 
section 110(l).'' Second, the commenters assert that Utah's treatment 
of the SO2 emissions reductions from the Carbon plant, which 
continues to report Carbon's emissions under the SO2 
Backstop Trading Program so that they can be credited to the 
NOX BART Alternative, violates CAA section 110(l). The 
commenters argue that such treatment eliminates an applicable 
requirement under the CAA that results in an increase in overall 
allowed emissions.
    Response: The EPA disagrees with these comments. CAA section 110(l) 
states in relevant part: ``The Administrator shall not approve a 
revision of a plan if the revision would interfere with any applicable 
requirement concerning attainment and reasonable further progress (as 
defined in section 7501 of this title), and any other applicable 
requirement of this chapter.'' \35\ CAA section 110(l) applies to all 
requirements of the CAA and to all areas of the country, whether 
attainment, nonattainment, unclassifiable or maintenance for one or 
more of the six criteria pollutants. EPA interprets section 110(l) as 
applying to all National Ambient Air Quality Standards (NAAQS) that are 
in effect, including those for which SIP submissions have not been 
made.\36\ However, the level of rigor needed for any CAA section 110(l) 
demonstration will vary depending on the nature and circumstances of 
the revision.
---------------------------------------------------------------------------

    \35\ 42 U.S.C. 7410(l).
    \36\ In general, a section 110(l) demonstration should address 
all pollutants whose emissions and/or ambient concentrations would 
change as a result of a plan revision. Here, commenters allege that 
emissions and/or ambient concentrations of NOX and 
SO2 would change as a result of this plan revision.
---------------------------------------------------------------------------

    There are two possible paths for satisfying CAA section 110(l). 
First, a state may demonstrate through an air quality analysis that the 
revision will not interfere with attainment of the NAAQS, reasonable 
further progress, or any other applicable requirements. Second, a state 
may substitute equivalent emissions reductions to compensate for any 
change to a plan to ensure actual emissions to the air are not 
increased and thus preserve status quo air quality.\37\ The second 
approach may be used, for example, where no attainment demonstrations 
are available to guide an analysis of whether the SIP revision would 
interfere with attainment of the NAAQS. However, nothing in the statute 
requires a state to rely on substitute emission reductions or alters 
the basic proposition that section 110(l) can be satisfied by an air 
quality analysis demonstrating that a plan revision will not interfere 
with any applicable requirement concerning attainment and reasonable 
further progress, or any other applicable CAA requirement. As explained 
in greater detail below, in this case, the EPA has concluded based on 
an air quality analysis that the revision will not interfere with 
attainment of the NAAQS or any other applicable CAA requirement and is 
not relying on substitute emission reductions.
---------------------------------------------------------------------------

    \37\ ``Equivalent'' emissions reductions are reductions that are 
equal to or greater than those reductions achieved by the control 
measure approved into the plan. To show that compensating emissions 
reductions are equivalent, adequate justification must be provided. 
The compensating, equivalent reductions should represent actual 
emissions reductions achieved in a contemporaneous time frame to the 
change of the existing control measure in order to preserve the 
status quo air quality. If the status quo is preserved, 
noninterference is demonstrated. In addition to being 
contemporaneous, the equivalent emissions reductions should also be 
permanent, enforceable, quantifiable, and surplus.
---------------------------------------------------------------------------

    Before addressing comments regarding the EPA's analysis, however, 
we address the commenters' suggestion that CAA section 110(l) per se 
prohibits approval of any SIP revision that allows an increase in 
emissions or weakens requirements relative to the existing 
implementation plan.\38\ Such an interpretation is not supported by the 
statutory language or case law. First, the plain language of the 
provision does not prohibit every SIP revision that allows an increase 
in emissions or weakens the existing plan's requirements. Rather, the 
language prohibits EPA approval of such a SIP revision if it would 
interfere with attainment of the NAAQS, reasonable further progress, or 
any other applicable requirement of the CAA.\39\ Thus, the language 
focuses on interference rather than on emissions increases or changed 
requirements.
---------------------------------------------------------------------------

    \38\ While the EPA acknowledges that this action will allow for 
greater NOX emissions than the 2016 FIP, the EPA does not 
concede that this action weakens regional haze requirements or 
allows increased visibility impairment. Instead, as is explained in 
the preamble to the proposed rule, this document, and in the EPA's 
response to comments, Utah's NOX BART Alternative will 
achieve greater reasonable progress through combined NOX, 
SO2, and PM reductions and therefore results in a 
stronger regional haze requirement than the existing plan. See, 
e.g., 85 FR 3566 (Table 3), 3569, 3573.
    \39\ See 42 U.S.C. 7410(l).
---------------------------------------------------------------------------

    Second, courts have upheld EPA's interpretation that the relevant 
inquiry under CAA section 110(l) is not whether the SIP revision allows 
an increase in emissions or weakens requirements, but whether there has 
been a demonstration that the SIP revision would interfere with the 
NAAQS, reasonable further progress, or any other applicable CAA 
requirement.
    For example, in Kentucky Resources Council v. EPA, the petitioners 
argued that a new attainment demonstration, which was not due for years 
after action on the SIP revision, was required in order to show 
noninterference under CAA section 110(l). Instead, the examination in 
that case was based on whether the area, which was designated as a 
nonattainment area for the relevant NAAQS, would have more difficulty 
attaining and maintaining the NAAQS with the SIP revision (i.e., 
whether the SIP revision would interfere with

[[Page 75865]]

attainment and maintenance of the NAAQS). In upholding the EPA's 
interpretation and examination, the U.S. Court of Appeals for the Sixth 
Circuit explained, ``Congress did not intend that the EPA reject each 
and every SIP revision that presents some remote possibility for 
interference. Thus, where EPA does not find that a SIP revision would 
interfere with attainment, approval of the revision does no violence to 
the statute.'' \40\ The Sixth Circuit further explained that, ``[i]n 
rejecting [a] strict interpretation in favor of one that allows 
[states] more flexibility, the EPA does service to a fundamental 
premise underlying the Clean Air Act scheme, which is that the states 
have the primary responsibility for ensuring that the NAAQS are met.'' 
\41\ Likewise, the U.S. Court of Appeals for the Eleventh Circuit 
upheld the EPA's interpretation stating, ``[w]e agree that where 
interference is not demonstrated, approval of the state's SIP revision 
appropriately respects the state's choice to achieve air quality 
standards with `whatever mix of emission limitations it deems best 
suited to its particular situation.' '' \42\
---------------------------------------------------------------------------

    \40\ 467 F.3d 986, 994 (6th Cir. 2006).
    \41\ Id. at 996.
    \42\ Alabama Environmental Council v. EPA, 711 F.3d 1277, 1293 
(11th Cir. 2013) (quoting Train v. NRDC, Inc., 421 U.S. 60, 79 
(1975)). See also Indiana v. EPA, 796 F.3d 803, 811 (7th Cir. 2015) 
(``When deciding whether to approve Illinois's SIP revision, EPA was 
required to determine whether the revision would, going forward, 
interfere with attainment.'') (emphasis in original); Galveston-
Houston Ass'n for Smog Prevention v. EPA, 289 Fed. Appx. 745, 754 
(5th Cir. 2008) (``[C]hanges to a SIP, either dropping measures or 
reducing measurement requirements, are not by themselves sufficient 
to prove interference. Rather, one must show that the substitute 
measures are not at least equivalent to the previous measures in 
achieving attainment.'').
---------------------------------------------------------------------------

    The commenters misconstrue other cases. In El Comite Para El 
Bienestar de Earlimart v. EPA and WildEarth Guardians v. EPA, the U.S. 
Court of Appeals for the Ninth Circuit dismissed petitioners' CAA 
section 110(l) challenges without addressing what is required to show 
that a SIP revision violates CAA section 110(l).\43\ And contrary to 
the commenters' assertion, neither Indiana v. EPA nor Kentucky 
Resources Council v. EPA stand for the proposition that the EPA must 
require substitute emissions reductions when a SIP revision increases 
emissions so that overall net emissions do not increase. In those 
cases, the U.S. Courts of Appeal for the Sixth and Seventh Circuits 
simply held that the EPA reasonably concluded that CAA section 110(l) 
was not violated when substitute emissions reductions were included in 
the SIP revisions at issue.\44\ But as explained above, the EPA has 
previously identified two options for demonstrating noninterference 
under CAA section 110(l): (1) Substitution of one measure by another 
with equivalent or greater emissions reductions/air quality benefit; 
and (2) an air quality analysis showing that removing the measure will 
not interfere with other applicable requirements (i.e., without a 
substitute measure).\45\ Here the SIP submission did not include 
substitute measures and the EPA chose to evaluate the air quality 
impact of the proposed revision. As we explain below, the EPA's air 
quality analysis shows that the Utah SIP revisions will not interfere 
with attainment of the NAAQS, reasonable further progress, or any other 
CAA requirement.
---------------------------------------------------------------------------

    \43\ See El Comite Para El Bienestar de Earlimart v. EPA, 786 
F.3d 688, 696-97 (9th Cir. 2015); WildEarth Guardians v. EPA, 759 
F.3d 1064, 1074 (9th Cir. 2014).
    \44\ See Kentucky Resources Council, 467 F.3d at 995-96; 
Indiana, 796 F.3d at 812-13.
    \45\ See Indiana, 796 F.3d at 806.
---------------------------------------------------------------------------

    Importantly, the statute does not require any ``specific 
methodology'' for air quality analyses under CAA section 110(l).\46\ In 
general, the level of rigor needed for any CAA section 110(l) 
demonstration will vary depending on the nature of the revision, its 
potential impact on emissions and air quality, and the air quality in 
the affected areas.
---------------------------------------------------------------------------

    \46\ Kentucky Resources Council, 467 F.3d at 995.
---------------------------------------------------------------------------

    In the proposed rule, the EPA proposed to find that the SIP 
revisions satisfy section 110(l). The document explained how the 
proposed SIP revisions and associated FIP withdrawal will comply with 
and thus could not be said to interfere with applicable regional haze 
requirements and general implementation plan requirements such as 
enforceability. The proposal also addressed potential interference with 
requirements concerning attainment and reasonable further progress, 
stating that the Utah SIP revisions will allow for greater 
NOX emissions at the four subject-to-BART units as compared 
to the 2016 FIP (which is currently judicially stayed). The proposal 
went on to explain that the change in these emissions compared to the 
FIP, however, is not anticipated to interfere with any applicable 
requirements under the CAA. We explained that the geographic area where 
the BART units are located is not part of a nonattainment area for any 
NAAQS. Furthermore, we explained that the approved portions of the 
PM2.5 attainment demonstrations and clean data 
determinations (CDD) for the Salt Lake City, Provo, and Logan, UT-ID 
nonattainment areas (NAAs) do not rely on the installation of SCR at 
Hunter or Huntington to achieve attainment of the NAAQS. Similarly, we 
explained that the EPA recently approved Utah's PM10 
redesignation requests and maintenance plans for Salt Lake County, Utah 
County, and Ogden City NAAs.\47\ These PM10 redesignation 
requests and maintenance plans do not rely on the installation of SCR 
at Hunter or Huntington to achieve attainment of the NAAQS. Finally, we 
explained that there are no other approved attainment demonstrations in 
other areas of the State or outside of the State that rely on the 
installation of SCR at Hunter or Huntington to achieve attainment of 
any of the NAAQS.\48\
---------------------------------------------------------------------------

    \47\ The PM10 redesignations for Salt Lake County, 
Utah County, and Ogden City nonattainment areas revised 40 CFR 
81.345 to signify that these areas are in attainment. Utah 
demonstrated maintenance of the PM10 standard to 2035 
through the maintenance plans.
    \48\ 85 FR 3574.
---------------------------------------------------------------------------

    The commenters contend that the EPA's air quality analysis is 
inadequate but did not provide any evidence that Utah's SIP revisions 
will interfere with any specific applicable requirement under the CAA. 
Here, for the reasons explained below, the EPA now confirms the 
proposed conclusions from the CAA section 110(l) analysis in the 
proposal.
    First, the geographic area where the Hunter and Huntington Units 
are located is not part of a nonattainment area for any NAAQS. Also, 
monitors in the geographic area do not currently show exceedances of 
the ozone NAAQS.\49\
---------------------------------------------------------------------------

    \49\ EPA, ``Air Quality System Preliminary Design Value 
Report,'' October 7, 2020.
---------------------------------------------------------------------------

    Second, since the publication of the proposal on January 22, 2020, 
the PM10 areas for Salt Lake County, Utah County, and Ogden 
City were redesignated as attaining the PM10 NAAQS.\50\ The 
areas continue to attain the PM10 NAAQS based on the most 
recent official ambient data (2017-2019).\51\ This means that these 
areas attained the NAAQS at current emission levels, i.e., the emission 
levels allowed by the NOX controls installed at Hunter and 
Huntington between 2006 and 2014 and which will be maintained under 
Utah's NOX BART Alternative. Because the FIP was judicially 
stayed and the NOX emission controls required by the FIP 
(SCRs) were never installed, current emissions levels do not reflect 
emission levels that would have been achieved if the FIP had been 
implemented. In other words, the EPA's approval of the Utah 
NOX BART Alternative will not cause an increase in 
NOX emissions at Hunter

[[Page 75866]]

or Huntington compared to current conditions. Therefore, the SIP 
approval will not interfere with already-achieved NAAQS attainment for 
PM10, and there is no evidence, including none provided by 
the commenters, to suggest that PM10 areas for Salt Lake 
County, Utah County, and Ogden City will not continue to attain the 
NAAQS following our approval of the SIP and concurrent withdrawal of 
the FIP.
---------------------------------------------------------------------------

    \50\ 85 FR 10989 (Feb. 26, 2020).
    \51\ EPA, ``Air Quality System Preliminary Design Value 
Report,'' September 15, 2020.
---------------------------------------------------------------------------

    Third, the Northern Wasatch Front, Southern Wasatch Front, and 
Uinta Basin ozone non-attainment areas were designated nonattainment 
for the 2015 ozone NAAQS on August 3, 2018.\52\ As part of the 2018 
ozone designation process, the EPA conducted a meteorological Hybrid 
Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) analysis to 
determine whether sources near the monitors violating the NAAQS 
contribute to the Northern and Southern Wasatch Front ozone non-
attainment areas. Evaluation of such meteorological data helps to 
assess the fate and transport of emissions contributing to ozone 
concentrations and to identify areas potentially contributing to the 
monitored violations. Results of the HYSPLIT analysis for the Northern 
and Southern Wasatch Front ozone nonattainment areas show that back 
trajectories rarely originated or passed through Carbon and Emery 
counties on high ozone days in the Wasatch Front (where Hunter and 
Huntington are located).\53\ Instead, the HYSPLIT analysis indicates 
that emissions originating within Davis and Salt Lake Counties, the 
southern portion of Weber County, the northern portion of Utah County, 
and the eastern portion of Tooele County primarily contribute to 
monitor violations.\54\ Furthermore, the monitors in the Southern 
Wasatch Front ozone nonattainment area (closest to the BART sources) 
are currently attaining the ozone standard using 2017-2019 and 
preliminary 2018-2020 data.\55\
---------------------------------------------------------------------------

    \52\ 83 FR 25776, 25836 (June 4, 2018). At that time, the ozone 
monitors located closest to the two power plants, in Carbon County, 
did not violate the 2015 ozone standard. EPA, ``Utah: Northern 
Wasatch Front, Southern Wasatch Front, and Uinta Basin Intended Area 
Designations for the 2015 Ozone National Ambient Air Quality 
Standards Technical Support Document (TSD),'' page 6 (``Utah 2015 
Ozone TSD''). Also found in docket EPA-HQ-OAR-2017-0548; posted 
January 5, 2018.
    \53\ Utah 2015 Ozone TSD, pages 18-25.
    \54\ Id. at 25.
    \55\ EPA, ``Air Quality System Preliminary Design Value 
Report,'' October 7, 2020.
---------------------------------------------------------------------------

    For the Uinta Basin non-attainment area, the EPA has determined 
that ozone production is a highly localized phenomenon. The Uinta Basin 
is a winter ozone area, where violating ozone concentrations are 
dependent on stagnant winter conditions associated with strong 
temperature inversions. During the ozone designations process, the EPA 
used the latest data and information available to the agency (and to 
the states and tribes through the Ozone Designations Mapping Tool and 
the EPA Ozone Designations Guidance and Data web page),\56\ to evaluate 
emissions and air quality data and other information for counties in 
the Uinta Basin. The EPA determined that the stagnant winter conditions 
associated with strong temperature inversions limit the influence of 
areas outside of the topographic Uinta Basin.\57\ Thus, at the time of 
the 2018 designation, the EPA determined that sources in surrounding 
counties (like Hunter and Huntington) do not contribute to the 
violating area because of these unique geographic features and the 
associated winter temperature inversion meteorology.
---------------------------------------------------------------------------

    \56\ The EPA's Ozone Designations Guidance and Data web page can 
be found at https://www.epa.gov/ozone-designations/ozone-designations-guidance-and-data.
    \57\ Utah 2015 Ozone TSD, pages 29, 30.
---------------------------------------------------------------------------

    Fourth, the Salt Lake City, Provo, and Logan, Utah-Idaho (UT-ID) 
PM2.5 nonattainment areas were designated nonattainment for 
the 2006 24-hour PM2.5 NAAQS on November 13, 2009.\58\ On 
October 19, 2018, the EPA finalized a determination of attainment for 
the Logan, UT-ID PM2.5 nonattainment area.\59\ Based on the 
most recent 3 years of valid data at that time (2015-2017), the Logan, 
UT-ID nonattainment area attained the 2006 primary and secondary 24-
hour PM2.5 NAAQS by the attainment date of December 31, 
2017. Likewise, on June 8, 2020, the EPA proposed a determination of 
attainment, based on the most recent 3 years of valid data (2017-2019), 
that the Salt Lake City and Provo nonattainment areas attained the 2006 
primary and secondary 24-hour PM2.5 NAAQS by the attainment 
date of December 31, 2019.\60\ On January 13, 2020, Utah submitted 
redesignation requests for the Logan, UT-ID, Salt Lake City, and Provo 
PM2.5 nonattainment areas and the EPA is actively reviewing 
this submittal for future action.
---------------------------------------------------------------------------

    \58\ 74 FR 58688 (Nov. 13, 2009).
    \59\ 83 FR 52983 (Oct. 19, 2018). A nonattainment area may be 
issued a determination of attainment by the EPA only if monitored 
data demonstrate that air quality has improved enough that the NAAQS 
is now being achieved. These determinations are based upon complete, 
quality-assured data gathered at established state and local air 
monitoring stations and national air monitoring stations in the 
nonattainment area and must include a notice and comment rulemaking 
by the EPA determining that the area is attaining the relevant 
standard. Although a determination of attainment is not equivalent 
to a redesignation in 40 CFR part 81, a determination of attainment 
shows that monitored air quality no longer violates the NAAQS.
    \60\ 85 FR 35033 (June 8, 2020).
---------------------------------------------------------------------------

    Because the Logan, UT-ID PM2.5 nonattainment area is now 
attaining the PM2.5 NAAQS and we proposed to find that the 
Salt Lake City and Provo PM2.5 nonattainment areas are also 
now attaining the PM2.5 NAAQS at current emission levels, 
which would not increase upon approval of Utah's SIP revisions, the SIP 
approval will not interfere with NAAQS attainment for PM2.5. 
Additionally, there is no evidence, including none provided by the 
commenters, to suggest that these areas will not continue to attain the 
NAAQS following our approval of the SIP and concurrent withdrawal of 
the FIP.
    Fifth, contrary to the commenters' argument, the EPA demonstrated 
that the SIP approval will not interfere with the CAA's BART 
requirements, including the SO2 Backstop Trading Program. As 
explained elsewhere in this document, Utah's amendments to the 
SO2 Backstop Trading Program do not alter the applicable 
2018 SO2 milestone or the sources covered by the Program, 
and thus maintain compliance with the Program and the Regional Haze 
Rule. The SIP amendments to Utah's SO2 milestone reporting 
requirements under the SO2 Backstop Trading Program are 
merely an accounting exercise to ensure that emission reductions 
resulting from the Carbon plant's closure are not credited towards both 
the SO2 Backstop Trading Program and the NOX BART 
Alternative. The SIP amendments further do not result in an actual 
increase in emissions.
    In summary, we find that Utah's SIP revisions will not interfere 
with attainment of the NAAQS, reasonable further progress, or other CAA 
requirements because: (1) The geographic area where the Hunter and 
Huntington Units are located is not part of a nonattainment area for 
any NAAQS; (2) the recently redesignated former PM10 
nonattainment areas in Salt Lake County, Utah County, and Ogden City 
are attaining the PM10 NAAQS at current emission levels, 
which would remain unchanged with approval of Utah's SIP revisions; (3) 
we determined in 2018 that the Hunter and Huntington power plants do 
not contribute to the Northern Wasatch Front and Southern Wasatch Front 
ozone non-attainment areas, and that the Uinta Basin non-attainment 
area is a highly localized phenomenon and sources in surrounding 
counties, including the Hunter and Huntington power plants, do not 
contribute to the violating area; (4) the Logan, UT-ID PM2.5 
nonattainment area is attaining the

[[Page 75867]]

PM2.5 NAAQS, and we proposed to find that the Salt Lake City 
and Provo PM2.5 nonattainment areas are also attaining the 
PM2.5 NAAQS, all at current emission levels that would not 
increase under Utah's SIP revisions; and (5) the Utah SIP revisions 
properly account for SO2 emissions in accordance with 
applicable requirements. Furthermore, the commenters provided no 
analysis or information to indicate otherwise. Thus, we confirm our 
position in the proposed rule that Utah's SIP revisions are not 
anticipated to interfere with applicable requirements of the CAA and 
therefore CAA section 110(l) does not prohibit approval of this SIP and 
concurrent withdrawal of the FIP.

B. BART Alternative Requirements

    Comment summary: Some commenters asserted that because the EPA's 
proposed rule would result in a significantly different distribution of 
emissions from BART, it fails to show ``greater reasonable progress'' 
under 40 CFR 51.308(e)(3) than the EPA's previously issued FIP. 
Specifically, the commenters assert that when alleged technical 
deficiencies including those in the CAMx dispersion modeling are 
corrected, the EPA is unable to prove ``greater reasonable progress'' 
because visibility will decline in one or more Class I areas and there 
is not an overall improvement in visibility over all affected Class I 
areas.
    Response: We disagree with this comment. The three plants (Hunter, 
Huntington, and Carbon) are all located within 40 miles of each other 
in Central Utah and are therefore similarly situated to the affected 
Class I areas. But Utah chose to use CAMx dispersion modeling to assess 
whether the NOX BART Alternative achieves greater reasonable 
progress for the worst and best 20 percent of days (i.e., the two-prong 
test). This is the regulatory test required under Sec.  51.308(e)(3) if 
the distribution of emissions were substantially different.\61\ Thus, 
the question of emissions distribution is not pertinent to the EPA's 
approval of Utah's NOX BART Alternative. Any influence that 
the respective geographic relationship of the emission reductions from 
BART and the NOX BART Alternative have on visibility impacts 
at the Class I areas is resolved by the CAMx modeling.
---------------------------------------------------------------------------

    \61\ See 40 CFR 51.308(e)(3).
---------------------------------------------------------------------------

    We respond to specific comments related to alleged technical 
deficiencies in the modeling in more detail below and in the RTC 
document. We find that the CAMx modeling used for the greater 
reasonable progress demonstration was performed consistent with EPA 
guidance and that the model performance was similar to applications of 
the CAMx model that the EPA and states have used in previous actions 
for regional haze.\62\ The CAMx modeling results showed that the 
NOX BART Alternative met the requirements of the greater 
reasonable progress two-prong test, i.e., visibility does not decline 
in any Class I area under the BART Alternative relative to the Baseline 
on both the 20% best and 20% worst days, and the average visibility 
improvement across all affected Class I areas is greater under the BART 
Alternative than under the BART Benchmark.\63\
---------------------------------------------------------------------------

    \62\ Previous actions that relied on CAMx modeling include the 
Cross-State Air Pollution Rule (CSAPR) (76 FR 48208 (Aug. 8, 2011)); 
the FIP revision for Laramie River Station in Wyoming (84 FR 22711 
(May 20, 2019)); and the SIP revision for Coronado Generating 
Station in Arizona (82 FR 46903 (Oct. 10, 2017)).
    \63\ See 85 FR 3573.
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C. BART Alternative ``Greater Reasonable Progress'' Determination

    Comment summary: Some commenters asserted that the CAMx modeling 
supporting the Utah NOX BART Alternative is flawed because 
it continues to assume that the installation and operation of SCR on 
Hunter Units 1 and 2 and Huntington Units 1 and 2 would achieve a 
NOX emission rate of 0.07 lb/MMBtu on a 30-day rolling 
average, as approved by the EPA four years ago in its FIP. The 
commenters contend that there are several electric generating units 
(EGUs) that have achieved NOX emission rates of 0.04 lb/
MMBtu or lower on an annual average basis. The commenters further 
contend that the EPA recently adopted a BART alternative for the 
Laramie River Station in Wyoming and acknowledged that a 0.04 lb/MMBtu 
NOX emission rate would be achieved with SCR on an annual 
average basis under a 0.06 lb/MMBtu NOX limit applicable on 
a 30-day average basis.
    The commenters further assert that while the Hunter and Huntington 
BART units have been achieving 0.19-0.20 lb/MMBtu NOX rates 
on an annual average basis in the last two years, these units should be 
able to readily achieve a 0.04 lb/MMBtu annual average NOX 
rate with SCR. The commenters contend that such a NOX rate 
equates to a 74-80% NOX removal efficiency across the SCR, 
and SCR systems are routinely designed to achieve 90% NOX 
removal. The commenters therefore argue that it is improper to judge 
the Utah BART Alternative against a BART Benchmark that utilizes 
obsolete emissions information and that the EPA should not have assumed 
a controlled annual average NOX rate any higher than 0.04 
lb/MMBtu for the Hunter and Huntington Units in BART modeling.
    Response: We disagree with this comment. By way of background, the 
EPA's FIP used an assumed emission rate of 0.05 lb/MMBtu on an annual 
basis, but required compliance with a 0.07 lb/MMBtu, 30-day rolling 
average limit.\64\ The commenters here contend that EPA should have 
used a lower annual limit, which would in turn lower the 30-day rolling 
average limit, for purposes of the BART Benchmark. As an initial 
matter, emission limits associated with BART do not need to meet the 
lowest emission rate achieved with that technology at any coal-fired 
power plant. The Regional Haze Rule provides that ``[t]he determination 
of BART must be based on an analysis of the best system of continuous 
emission control technology available and associated emission 
reductions achievable for each BART-eligible source that is subject to 
BART.'' \65\
---------------------------------------------------------------------------

    \64\ 81 FR 43903.
    \65\ 40 CFR 51.308(e)(1)(ii)(A).
---------------------------------------------------------------------------

    Additionally, the BART Guidelines state that: ``[i]n assessing the 
capability of the control alternative, latitude exists to consider 
special circumstances pertinent to the specific source under review, or 
regarding the prior application of the control alternative,'' \66\ and 
that ``[t]o complete the BART process, you must establish enforceable 
emission limits that reflect the BART requirements.'' \67\ The five 
factor BART analysis described in the Guidelines is a case-by-case 
analysis that considers site-specific factors in assessing the best 
technology for continuous emission controls. After a technology is 
determined as BART, the BART Guidelines require establishment of an 
emission limit that reflects the BART requirements, but does not 
specify that the emission limit must represent the maximum level of 
control achieved by the technology selected as BART.
---------------------------------------------------------------------------

    \66\ 40 CFR part 51, appendix Y, section IV.D.3.
    \67\ 40 CFR part 51, appendix Y, section V.
---------------------------------------------------------------------------

    While the BART Guidelines and the Regional Haze Rule do not 
preclude selection of the maximum level of control achieved by a given 
technology as BART, the emission limit must be set to reflect BART 
which in turn must be determined based on a consideration and weighing 
of the five statutory BART factors. Therefore, limits set in other BART 
determinations, Best Available Control Technology during Prevention of 
Significant Deterioration review, or emission rates achieved from the 
operation of individual facilities under

[[Page 75868]]

an emissions trading program (e.g., CSAPR) may provide important 
information, but should not be construed to automatically represent the 
most appropriate BART limit for a given technology.
    Additionally, while the commenters cite actual annual emission 
rates found in the EPA's Air Markets Program Database (AMPD) to support 
their claim that an annual emission rate of 0.04 lb/MMBtu is achievable 
with SCR, a more thorough review of the data supports the EPA's 
conclusion that an annual emission rate no lower than 0.05 lb/MMBtu is 
representative of what can be achieved when retrofitting SCR to an 
existing boiler. Of the 155 coal-fired EGUs equipped with SCR operating 
in 2019 with actual annual emission rates below 0.10 lb/MMBtu, 135 
(87.1%) had actual annual emissions greater than 0.05 lb/MMBtu, 18 
(11.6%) had actual annual emissions greater than 0.04 lb/MMBtu and less 
than or equal to 0.05 lb/MMbtu, and only 2 (1.3%) had actual annual 
emissions less than or equal 0.04 lb/MMBtu.\68\ The figure in our RTC 
document shows the number of coal-fired EGUs equipped with SCR by 
actual annual emission range in increments of 0.01 lb/MMbtu. 
Notwithstanding the site-specific nature of SCR retrofits, these data 
support the conclusion that an annual emission rate of 0.05 lb/MMBtu is 
appropriate for the Utah BART units, and confirm that the assumption is 
relatively conservative because the majority of EGUs equipped with SCR 
have actual annual emission rates that are higher.
---------------------------------------------------------------------------

    \68\ See spreadsheet titled ``SCR Actual Annual Emissions by 
Range.xlsx'' in the docket. Note that AMPD query returned a total of 
265 coal-fired EGUs equipped with SCR operating in 2019. However, 
many of these units had actual annual emission rates well in excess 
of what would be anticipated with an SCR when operated on a year-
round basis. For that reason, the EPA eliminated all units with an 
actual annual emission rate in excess of 0.10 lb/MMBtu from 
consideration, leaving 155 units.
---------------------------------------------------------------------------

    Moreover, the lowest emission rates found in the AMPD database may 
not be indicative of what can be expected at the Utah BART units for a 
number of reasons. As noted above, the site-specific characteristic of 
each SCR installation must be taken into account when determining the 
anticipated actual annual emission rate. For example, the commenter 
lists Dry Fork Unit 1 in Wyoming among units that are achieving an 
actual annual emission rate of 0.04 lb/MMBtu.\69\ However, construction 
on Dry Fork Unit 1 began in 2007 and SCR was integrated into the 
original design, and not installed as a retrofit as would be the case 
with the Utah BART units.
---------------------------------------------------------------------------

    \69\ AMPD data for 2019 show actual annual emissions of 0.0432 
lb/MMBtu, above 0.04 lb/MMBtu.
---------------------------------------------------------------------------

    Our use of an anticipated actual annual emission rate with SCR of 
0.05 lb/MMBtu here is also consistent with our 2016 FIP.\70\ The EPA is 
unaware of, and the commenters have not cited, any advancements in SCR 
retrofit technology that have occurred since our July 2016 final rule. 
Accordingly, we have no reason to conclude that the assumptions we made 
at that time regarding SCR performance are now obsolete.
---------------------------------------------------------------------------

    \70\ 81 FR 2034.
---------------------------------------------------------------------------

    Finally, the commenters have incorrectly assumed that a 90% control 
efficiency can be achieved in all SCR applications regardless of the 
input NOX emission rate or other parameters. In our July 
2016 final rule, the EPA used an actual annual average emission rate 
for LNB/SOFA (i.e., pre-SCR) at the Utah BART units of 0.20 lb/MMBtu to 
0.22 lb/MMBtu.\71\ A 90% reduction with SCR from these emission rates 
would yield annual emission rates of 0.020 lb/MMBtu to 0.022lb/MMBtu. 
As can be seen from the AMPD data discussed above, no EGU has achieved 
this level of control with SCR. Thus, because this level of control has 
not been achieved in practice, it is not a realistic expectation for 
the Utah BART units.
---------------------------------------------------------------------------

    \71\ See 81 FR 43903, Tables 2 through 5.
---------------------------------------------------------------------------

    Comment summary: Some commenters criticized the selection of Class 
I areas for inclusion in the CAMx modeling domain. The commenters 
asserted that the modeling included Class I areas beyond 300 kilometers 
from the Carbon, Hunter, and Huntington power plants, and afforded 
equal weight to areas near and distant from the pollution sources even 
though there is higher confidence in the CAMx modeling at sites within 
300 kilometers of the sources. The commenters further asserted that 
PacifiCorp included certain areas (e.g. San Pedro Parks Wilderness Area 
(New Mexico)) farther than 500km from the sources, while apparently 
omitting others a similar distance away (e.g. Craters of the Moon in 
Idaho; Jarbidge in Nevada; Yellowstone, Grand Teton, Washakie, 
Fitzpatrick, and Bridger in Wyoming; Petrified Forest and Sycamore 
Canyon in Arizona; and Rocky Mountain, Eagles Nest, Rawah, and Great 
Sand Dunes in Colorado, among others). The commenters also stated that 
while Utah appeared to give undue weight to visibility benefits at 
certain distant Class I areas, Utah gave zero weight (and did not even 
analyze) visibility impacts at similarly distant sites. The commenters 
therefore argue that the assessed Class I areas were selected in an 
arbitrary manner, and that the analysis does not account for visibility 
impacts ``over all affected Class I areas,'' as required by the 
Regional Haze Rule.\72\ The commenters argue that if corrected, the 
alleged errors may flip the outcome of Utah's analysis; i.e., if the 
Class I areas outside of 300 kilometers from the power plants are 
omitted, the modeling fails to demonstrate that the average visibility 
benefit of the BART Alternative will be greater than the 2016 FIP (BART 
Benchmark).
---------------------------------------------------------------------------

    \72\ 40 CFR 51.308(e)(3)(ii).
---------------------------------------------------------------------------

    Response: The EPA disagrees with this comment. The draft modeling 
protocol prepared by PacifiCorp included a rectangular modeling domain 
that included all of the Class I areas within a distance of 300 km of 
the Hunter and Huntington Units that had been considered in previous 
CALPUFF modeling applications for these BART sources. The EPA reviewed 
the proposed modeling domain and recommended that the boundaries of the 
domain be extended farther east, north, and south to include terrain 
features that could affect the transport of pollutants from the BART 
sources.\73\ PacifiCorp agreed to extend the size of the domain as 
requested by the EPA. Thus, for example, the domain was extended 
farther north to include the Uinta mountain range in northern Utah, and 
the domain was extended farther east such that the relevant Class I 
areas were fully included in the model domain and were not located 
close to the boundary of the domain. Because of the possibility of 
modeling artifacts at domain boundaries,\74\ the EPA believed that the 
larger model domain was technically more defensible. The motivation for 
expanding the size of the model domain was to provide more accurate 
model results, not to include more Class I areas. However, given that 
additional Class I areas were included within the domain, the EPA 
determined that it was appropriate to consider visibility benefits at 
all Class I areas for which model results were available. The EPA 
determined that it would have been arbitrary to include some Class I 
areas

[[Page 75869]]

but not to include other nearby Class I areas for which modeling 
results were available. The additional Class I areas (Mount Zirkel 
Wilderness Area [WA], Maroon Bells/Snowmass WA, West Elk WA, La Garita 
WA, Weminuche WA, and San Pedro Parks WA) are located close to and 
within the same air basins as the other Class I areas previously 
included in the CALPUFF modeling. While there are other Class I areas 
located within 500 km of the sources, prevailing wind patterns and 
terrain features make it less likely that emissions from Hunter and 
Huntington would impact those areas, and the EPA did not find that it 
was reasonable to recommend further expansion of the model domain to 
include these Class I areas. In addition, the calculation of the 
average difference between BART and the BART Alternative is most 
influenced by the Class I areas closest to and most impacted by Hunter, 
Huntington and Carbon. Therefore, small modeled impacts at additional 
distant Class I areas would likely have little or no impact on the 
average impact across all affected Class I areas.
---------------------------------------------------------------------------

    \73\ Email dated September 20, 2017, from Aaron Worstell (EPA) 
to Jay Baker (UDAQ), Subject: Updated invitation: Utah Regional Haze 
CAMx Model Review, docket ID EPA-R08-OAR-2015-0463-0228.
    \74\ For example, if emissions plumes near the model domain 
boundaries are transported out of the model domain, those emissions 
are permanently lost to the model, even if meteorological 
recirculation patterns might cause those emissions to re-enter the 
domain. Selecting a large model domain reduces the possibility that 
emissions plumes will be transported out of the model domain.
---------------------------------------------------------------------------

    We also disagree with the comment that there is higher confidence 
in the CAMx modeling at sites within 300 kilometers of the sources. 
Higher confidence in modeling for sites within 300 kilometers is a 
feature of the CALPUFF model. For example, the Interagency Workgroup on 
Air Quality Modeling report recommended the ``use of CALPUFF for 
transport distances of order 200 km and less. Use of CALPUFF for 
characterizing transport beyond 200 to 300 km should be done cautiously 
with an awareness of the likely problems involved.'' \75\ The CAMx 
model is not subject to this limitation because it was developed and 
has been widely used and evaluated for applications at distances much 
greater than 300 kilometers, including modeling and regulatory analyses 
for interstate transport of ozone and PM2.5. Photochemical 
grid models such as CAMx are recommended by the EPA in Appendix W \76\ 
for long range transport modeling for secondary pollutants, including 
regional haze.
---------------------------------------------------------------------------

    \75\ EPA, ``Interagency Workgroup on Air Quality Modeling 
(IWAQM) Phase 2 Summary Report and Recommendations for Modeling Long 
Range Transport Impacts,'' December 1998, pages 18 and D-11.
    \76\ 40 CFR part 51, appendix W.
---------------------------------------------------------------------------

    Comment summary: Some commenters asserted that the CAMx modeling 
cannot support the NOX BART Alternative because it employs 
the wrong metric for comparison. Specifically, the commenters argue 
that instead of using ``the worst and best 20 percent of days'' to 
demonstrate greater reasonable progress under 40 CFR 51.308(e)(3), Utah 
should have substituted an analysis for the 20% of days in a calendar 
year ``with the highest amount of anthropogenic visibility impairment'' 
under the EPA's 2017 revisions to the Regional Haze Rule. The 
commenters argue that without such modeling, the EPA cannot demonstrate 
in accordance with the regional haze requirements that the BART 
Alternative would result in greater reasonable progress than BART as 
determined in the EPA's FIP (BART Benchmark), and the BART Alternative 
is not approvable.
    Response: We disagree that the CAMx modeling relied on in Utah's 
SIP submittal employs the wrong metric for comparison of the BART 
Benchmark and NOX BART Alternative. First, as explained 
elsewhere in the preamble to the proposed rule, the RTC document, and 
this document, Utah submitted its NOX BART Alternative, and 
the EPA proposed to approve it, under the two-prong test in 40 CFR 
51.308(e)(3)(i) and (ii). The two-prong test requires that ``the State 
must conduct dispersion modeling to determine differences in visibility 
between BART and the [alternative] for each impacted Class I area, for 
the worst and best 20 percent of days.'' \77\ The 2017 revisions to the 
Regional Haze Rule discussed by the commenter did not change 40 CFR 
51.308(e)(3).\78\ Indeed, Sec.  51.308(e)(3) is a BART provision 
applicable to the first regional haze planning period, and the EPA 
explicitly did not make any changes to the Regional Haze Rule's BART 
provisions in the 2017 revisions.\79\ Because Utah's SIP revisions are 
intended to satisfy first planning period BART requirements,\80\ the 
CAMx modeling properly employed the haziest days metric rather than the 
new ``most impaired days'' metric.
---------------------------------------------------------------------------

    \77\ 40 CFR 51.308(e)(3) (emphasis added).
    \78\ See 82 FR 3078, 3124 (Jan. 10, 2017).
    \79\ See 81 FR 26942, 26947 (May 4, 2016) (``States undertook 
the BART determination process during the first implementation 
period. The BART requirement was a one-time requirement . . . . 
Consequently, we are not proposing any changes to the BART 
provisions in this rulemaking.'').
    \80\ See 85 FR 3575.
---------------------------------------------------------------------------

    Comment summary: Commenters assert that the most fundamental 
technical deficiency in the CAMx modeling is the emissions information 
used by Utah for the ``typical year'' scenario (also called the 2011 
reference case). Commenters assert that the EPA provided no explanation 
as to why the 2011 reference case was modeled with the 2001-2003 
baseline period emissions at Carbon, Hunter and Huntington. Commenters 
note that in the interval between the baseline period and the typical 
year, PacifiCorp installed significant emissions control improvements 
at both Hunter and Huntington, which resulted in substantial 
SO2 reductions.
    Commenters assert that the Hunter and Huntington emission controls 
are important because the associated impact of such controls on 
visibility conditions in Class I areas in Utah and neighboring states 
already would be reflected in the 2009-2013 five-year average 
Interagency Monitoring of Protected Visual Environments (IMPROVE) data 
used in the CAMx modeling. Commenters claim that by using the 2001-2003 
baseline emissions to describe the Hunter and Huntington plants for the 
2011 reference year, the post-2003 SO2 reductions at Hunter 
and Huntington are essentially double counted. Commenters conclude that 
Utah's approach to typical year emissions for the Hunter, Huntington 
and Carbon power plants presents a fundamental error with the CAMx 
modeling and the resulting implication is that the modeling results 
cannot be used to support Utah's conclusion that the Utah 
NOX BART Alternative would result in greater visibility 
improvement compared to the EPA FIP (BART Benchmark).
    Response: We disagree with this comment. As an initial matter, the 
commenters have not explained how the emissions data used in the 2011 
Typical Year scenario results in a faulty outcome to the two-prong 
regulatory analysis required under 40 CFR 51.308(e)(3). Indeed, the 
modeling was appropriately designed to assess each prong in a 
reasonable and technically defensible way.\81\
---------------------------------------------------------------------------

    \81\ See AECOM, ``Photochemical Modeling Protocol to Assess 
Visibility Impacts for PacifiCorp Power Plants Located in Utah,'' 
January 2018.
---------------------------------------------------------------------------

    As we explained in the proposed rule, CAMx was configured to 
simulate four modeling scenarios: the 2011 Typical Year, the 2025 
Baseline, the BART Benchmark, and the Utah NOX BART 
Alternative. The 2011 Typical Year scenario includes emissions for 
Carbon, Hunter and Huntington at 2001-2003 levels, while all other 
sources remain at 2011 levels. The annual NOX and 
SO2 emissions modeled for each of these scenarios are shown 
in Table 1 below.

[[Page 75870]]



                                               Table 1--Annual NOX and SO2 Emissions by Modeling Scenario
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                   2011  Typical year          2025  Baseline         2025  BART benchmark        2025  Utah NOX BART
                                               ------------------------------------------------------------------------------         alternative
                 Plant                    Unit                                                                               ---------------------------
                                                 NOX  (tpy)   SO2  (tpy)   NOX  (tpy)   SO2  (tpy)   NOX  (tpy)   SO2  (tpy)   NOX  (tpy)    SO2  (tpy)
 
--------------------------------------------------------------------------------------------------------------------------------------------------------
Carbon.................................      1        1,312        2,286        1,312        2,286        1,312        2,286             0             0
                                             2        1,977        3,528        1,977        3,528        1,977        3,528             0             0
Hunter.................................      1        6,380        2,535        6,380        2,535          796        1,153         3,166         1,153
                                             2        6,092        2,531        6,092        2,531          798        1,408         3,028         1,408
                                             3        6,530        1,204        6,530        1,204        6,530        1,230         4,490         1,230
Huntington.............................      1        5,944        2,380        5,944        2,380          793        1,254         3,147         1,254
                                             2        5,817       12,308        5,816       12,308          753        1,201         3,366         1,201
--------------------------------------------------------------------------------------------------------------------------------------------------------

    The modeling relied on the 2011 emissions data because a robust, 
well-evaluated modeling platform was available only for 2011 and was 
not available for any other year.
    The 2025 Baseline modeling scenario, which is based on the 2011 
Typical Year scenario with emissions projected to 2025, also uses 2001-
2003 emissions for PacifiCorp's units in order to reflect only those 
controls that were in place at those units in the baseline period 
(i.e., pre-regional haze measures).\82\ This allows for a 
straightforward comparison of the effects of the BART Benchmark versus 
the Utah NOX BART Alternative relative to the 2025 Baseline 
(i.e., relative to conditions without any regional haze measures 
applied to the Utah BART sources). Because measures included in the 
BART Alternative were installed starting in 2006, using emissions from 
a later year to represent the baseline would not accurately reflect the 
impacts of each of the two scenarios. While Utah could have chosen to 
use different years to represent baseline emissions from Hunter, 
Huntington, and Carbon, it chose to use a consistent period for these 
Units that is also consistent with the baseline period of the regional 
haze SIP, and we find this to be a reasonable approach.\83\
---------------------------------------------------------------------------

    \82\ Utah Regional Haze State Implementation Plan, Staff Review 
of Recommended Alternative to BART for NOX, May 28, 2019, 
page 13.
    \83\ Contrary to the commenters' claim, EPA explained this 
approach in the proposed rule. 85 FR 3572.
---------------------------------------------------------------------------

    The 2011 Typical Year and the 2025 Baseline scenarios were used in 
the development of relative response factors (RRFs) that were applied 
to publicly available IMPROVE monitoring data in order to predict 
future visibility conditions in 2025 for the BART Benchmark and the 
NOX BART Alternative scenarios. The BART Benchmark and BART 
Alternative results were then both compared to the 2025 Baseline 
scenario and to each other to determine whether the BART Alternative 
passes the two-prong test in Sec.  51.308(e)(3).
    The BART Benchmark scenario includes 2001-2003 Carbon and Hunter 3 
emissions, because Carbon and Hunter 3 are not BART sources. But the 
BART Benchmark reflects predicted NOX emissions reductions 
from the installation of SCR controls on Hunter and Huntington Units 1 
and 2 because those controls were required by EPA's 2016 FIP. The BART 
Benchmark scenario also includes SO2 emissions from Hunter 
and Huntington from 2014-2016 in order to match the BART Alternative 
scenario, which as explained below, is important for the comparison in 
Sec.  51.308(e)(3)(ii). The BART Alternative scenario includes 
emissions from Hunter and Huntington from 2014-2016 to reflect all 
emissions controls required by the Alternative, and zero emissions from 
Carbon because the Alternative requires Carbon's 2015 shutdown. As 
described below, these modeling scenarios allow an accurate comparison 
between the BART Benchmark and the Utah NOX BART Alternative 
under the two-prong test in Sec.  51.308(e)(3).
    The first step (prong 1) of the two-prong test requires a 
demonstration that the BART alternative does not result in a decline in 
visibility at any Class I area relative to a baseline.\84\ The record 
clearly establishes that there is no decline in visibility under the 
NOX BART Alternative when visibility impacts of the 
NOX BART Alternative are compared to the 2025 Baseline 
scenario.\85\ As we explained in the proposed rule under prong 1, while 
the post-2003 SO2 reductions from Hunter and Huntington 
increase the apparent overall visibility benefit of the BART 
Alternative relative to the Baseline, there would not be an anticipated 
decline in visibility relative to the Baseline in the absence of those 
SO2 reductions from Hunter and Huntington because the BART 
Alternative would still result in overall NOX, 
SO2, and PM emissions decreases compared to the 
Baseline.\86\
---------------------------------------------------------------------------

    \84\ 40 CFR 51.308(e)(3)(i).
    \85\ See 85 FR 3568-69, 3573, and Tables 4 and 5 (column D).
    \86\ Id. at 3573.
---------------------------------------------------------------------------

    At the second step of the (e)(3) test (prong 2), the state must 
establish that there is ``an overall improvement in visibility, 
determined by comparing the average differences between BART and the 
alternative.'' \87\ Thus, the purpose of the modeling at this step is 
to allow for a comparison between two control scenarios--the BART 
benchmark and the BART alternative--relative to a baseline. It is not 
critical that the baseline itself be entirely representative of what 
might be expected to happen in 2025 so long as the emissions and 
meteorological data used in the modeling allow for the comparison 
between the BART benchmark and BART alternative. As noted above, the 
commenters have not demonstrated that the 2025 Baseline scenario here 
does not serve that purpose.
---------------------------------------------------------------------------

    \87\ 40 CFR 51.308(e)(3)(ii).
---------------------------------------------------------------------------

    As we explained in the proposed rule, the relative to the 2025 
Baseline, the BART Benchmark and BART Alternative include actual 
SO2 reductions from Hunter and Huntington that occurred 
after the 2001-2003 baseline due to scrubber upgrades. Thus, the CAMx 
modeling results for the BART Benchmark and BART Alternative shown in 
Tables 4 and 5 of the proposed rule reflect these SO2 
reductions. The treatment of these SO2 reductions in the 
modeling does not affect the determination of greater reasonable 
progress under the two-prong test. Under prong 2, because the 
SO2 reductions from Hunter and Huntington are equal under 
the BART Alternative and BART Benchmark, they do not advantage either 
control scenario.\88\
---------------------------------------------------------------------------

    \88\ 85 FR 3572-73.
---------------------------------------------------------------------------

    In other words, even if the CAMx modeling counts Huntington and

[[Page 75871]]

Hunter as creating an additional visibility improvement in the BART 
Benchmark and NOX BART Alternative scenarios relative to the 
2025 Baseline scenario, this artifact of the data is present for both 
the BART Benchmark and BART Alternative scenarios. Thus, it does not 
have a meaningful effect on the comparison in relative improvement in 
visibility between those scenarios. The modeling does not, and need 
not, purport to establish actual, absolute improvements in visibility 
under the two scenarios; it simply needs to allow for a comparison 
between the scenarios. In order to pass the second prong under Sec.  
51.308(e)(3), a BART alternative must show an overall average 
improvement in visibility over the BART benchmark. Here, Utah's 
NOX BART Alternative demonstrated an overall average 
improvement over the BART benchmark of 0.00494 deciviews across all 
Class I areas on the 20 percent best days and 0.00058 deciviews on the 
20 percent worst days.\89\ Thus, Utah's NOX BART Alternative 
passes the second prong of 40 CFR 51.308(e)(3).
---------------------------------------------------------------------------

    \89\ Id. at 3569.
---------------------------------------------------------------------------

    In sum, there is no merit to commenters' assertion that the data 
used in the CAMx modeling cannot be used to support Utah's conclusion 
that the Utah NOX BART Alternative would result in greater 
visibility improvement compared to the EPA FIP (BART Benchmark) under 
the two-prong test in Sec.  51.308(e)(3).

III. The EPA's Final Action

    For the reasons stated in the preamble to the proposed rule, in the 
RTC document, and in this document, we are fully approving the SIP 
revisions submitted by the State of Utah on July 3, 2019, as 
supplemented on December 3, 2019.

A. 2019 Utah Regional Haze SIP Revisions

    We are approving these aspects of the 2019 Utah RH SIP revisions:
     NOX BART Alternative, including NOX 
emission reductions from Hunter Units 1, 2 and 3 and Huntington Units 1 
and 2, and SO2, NOX and PM emission reductions 
from Carbon Units 1 and 2.
     A NOX emission limit of 0.26 lb/MMBtu (30-day 
rolling average) each for Hunter Units 1 and 2 and Huntington Units 1 
and 2.
     A NOX emission limit of 0.34 lb/MMBtu (30-day 
rolling average) for Hunter Unit 3.
     A requirement to permanently close and cease operation of 
the Carbon power plant by August 15, 2015.
     The associated amendments to the SO2 milestone 
reporting requirements.
     MRR requirements for units subject to the NOX 
BART Alternative and the PM BART emission limits.
    We also note that the regulatory text amendments contained in this 
document include incorporation of additional parts of SIP section XX 
(XX.B-C and XX.E-N) and section XXIII, which were not addressed in the 
proposed action or in this final action. The EPA approved these SIP 
sections as meeting the requirements of the CAA and applicable 
regulations in previous actions; \90\ however, we inadvertently did not 
incorporate all approved sections in 40 CFR 52.2320(e). We are 
remedying this oversight and reorganizing 40 CFR 52.2320(e) to better 
reflect the structure of Utah's SIP submissions here. We did not reopen 
these previously approved SIP sections in this rulemaking.
---------------------------------------------------------------------------

    \90\ 73 FR 16543 (Mar. 28, 2008); 77 FR 74355 (Dec. 14, 2012); 
78 FR 4072 (Jan. 18, 2013); 81 FR 43894 (July 5, 2016).
---------------------------------------------------------------------------

    Finally, consistent with our approval of Utah's July 2019 and 
December 2019 SIP submissions, we find that Utah's SIP fully satisfies 
the requirements of section 309 of the Regional Haze Rule and therefore 
the State has fully complied with the requirements for reasonable 
progress, including BART, for the first implementation period.

B. FIP Withdrawal

    Because we find that Utah's July 2019 and December 2019 SIP 
submissions satisfy the NOX BART and MRR requirements 
currently addressed by the EPA's 2016 FIP, we are also withdrawing in 
whole the Utah Regional Haze FIP at 40 CFR 52.2336 that imposes 
NOX BART requirements on Hunter Units 1 and 2 and Huntington 
Units 1 and 2.

C. Clean Air Act Section 110(l)

    As we explain in detail in section II.A of this document and in the 
RTC document that accompanies this action, we find that our approval of 
the 2019 Utah SIP revisions and concurrent withdrawal of the 
corresponding the FIP is consistent with CAA section 110(l), 42 U.S.C. 
7410(l).

IV. Incorporation by Reference

    In this document, the EPA is finalizing regulatory text that 
includes incorporation by reference. In accordance with the 
requirements of 1 CFR 51.5, the EPA is finalizing the incorporation by 
reference of the SIP amendments described in section III.A of this 
preamble and set forth below. The EPA has made, and will continue to 
make, these materials generally available through https://www.regulations.gov (refer to docket EPA-R08-OAR-2015-0463) and at the 
EPA Region 8 Office (please contact the person identified in the FOR 
FURTHER INFORMATION CONTACT section of this preamble for more 
information).
    Therefore, these materials have been approved by the EPA for 
inclusion in the SIP, have been incorporated by reference by the EPA 
into that plan, are fully federally enforceable under sections 110 and 
113 of the CAA as of the effective date of the final rulemaking of the 
EPA's approval, and will be incorporated by reference by the Director 
of the Federal Register in the next update to the SIP compilation.\91\
---------------------------------------------------------------------------

    \91\ 62 FR 27968 (May 22, 1997).
---------------------------------------------------------------------------

V. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive 
Order 13563: Improving Regulation and Regulatory Review

    This action is not a ``significant regulatory action'' under the 
terms of Executive Order 12866 \92\ and was therefore not submitted to 
the Office of Management and Budget (OMB) for review. This final rule 
applies to three facilities in the State of Utah. It is therefore not a 
rule of general applicability.
---------------------------------------------------------------------------

    \92\ 58 FR 51735, 51738 (Oct. 4, 1993).
---------------------------------------------------------------------------

B. Executive Order 13771: Reducing Regulations and Controlling 
Regulatory Costs

    This action is not an Executive Order 13771 regulatory action 
because it is not significant under Executive Order 12866 for the 
reasons stated in section V.A above. Instead, it is a Rule of 
Particular Applicability that is exempted under Executive Order 12866.

C. Paperwork Reduction Act

    This action does not impose an information collection burden under 
the PRA. Because this rule revises regional haze reporting requirements 
for three facilities, the PRA does not apply.

D. Regulatory Flexibility Act

    I certify that this action will not have a significant economic 
impact on a substantial number of small entities under the RFA. This 
action will not impose any requirements on small entities. This rule 
does not impose any requirements or create impacts on small

[[Page 75872]]

entities as no small entities are subject to the requirements of this 
rule.\93\
---------------------------------------------------------------------------

    \93\ See 13 CFR 121.201, Sector 22, Subsector 221.
---------------------------------------------------------------------------

E. Unfunded Mandates Reform Act (UMRA)

    This action does not contain an unfunded mandate of $100 million or 
more as described in UMRA, 2 U.S.C. 1531-1538, and does not 
significantly or uniquely affect small governments.

F. Executive Order 13132: Federalism

    This action does not have federalism implications. It will not have 
substantial direct effects on the states, on the relationship between 
the National Government and the states, or on the distribution of power 
and responsibilities among the various levels of government.

G. Executive Order 13175: Consultation and Coordination With Indian 
Tribal Governments

    This action does not have tribal implications as specified in 
Executive Order 13175. It will not have substantial direct effects on 
tribal governments. Thus, Executive Order 13175 does not apply to this 
action.
    In comments on the proposed rule, the Ute Mountain Ute Tribe 
requested consultation. In response, the EPA offered consultation, but 
the Ute Mountain Ute Tribe later waived the opportunity for 
consultation.

H. Executive Order 13045: Protection of Children From Environmental 
Health Risks and Safety Risks

    This action is not subject to Executive Order 13045.\94\ The EPA 
interprets Executive Order 13045 as applying only to those regulatory 
actions that concern environmental health or safety risks that the EPA 
has reason to believe may disproportionately affect children, per the 
definition of ``covered regulatory action'' in section 2-202 of the 
Executive order. This action is not subject to Executive Order 13045 
because it does not concern an environmental health risk or safety 
risk.
---------------------------------------------------------------------------

    \94\ 62 FR 19885 (Apr. 23, 1997).
---------------------------------------------------------------------------

I. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use

    This action is not subject to Executive Order 13211 \95\ because it 
is not a significant regulatory action under Executive Order 12866.
---------------------------------------------------------------------------

    \95\ 66 FR 28355 (May 22, 2001).
---------------------------------------------------------------------------

J. National Technology Transfer and Advancement (NTTAA)

    This rulemaking does not involve technical standards.

K. Executive Order 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Populations

    The EPA believes that this action does not have disproportionately 
high and adverse human health or environmental effects on minority 
populations, low-income populations and/or indigenous peoples, as 
specified in Executive Order 12898 (59 FR 7629, February 16, 1994).
    The documentation for this decision is contained in EPA's EJ 
analysis. The EPA's Guidance on Considering Environmental Justice 
During the Development of Regulatory Actions \96\ is the Agency's guide 
for determining when environmental justice should be considered when 
developing regulations. In support of this guidance, the EPA used 
EJSCREEN \97\ to identify areas of potential environmental justice (EJ) 
concerns associated with this rulemaking. A 300-kilometer radius zone 
of impact was used in the EJSCREEN analysis consistent with other 
regional haze actions. The results do not identify any areas of 
potential EJ concerns.\98\ Moreover as explained in the preamble to the 
final rule and in response to comments, the Utah Regional Haze SIP, as 
revised by this action, will ensure a significant reduction in 
emissions compared to regional haze baseline levels (2002). Finally, 
the EPA's analysis under CAA section 110(l) shows that this action will 
not interfere with any applicable requirement concerning attainment and 
reasonable further progress or any other applicable CAA requirements. 
Thus, this final action will not create a disproportionately high and 
adverse effect on minority, low-income, and/or indigenous/tribal 
populations.
---------------------------------------------------------------------------

    \96\ https://www.epa.gov/sites/production/files/2015-06/documents/considering-ej-in-rulemaking-guide-final.pdf
    \97\ EJSCREEN: Environmental Justice Screening and Mapping Tool 
is available at https://www.epa.gov/ejscreen.
    \98\ Results in the EJSCREEN Report for the Hunter and 
Huntington Power Plants show percentiles of less than 80 for all EJ 
Indexes evaluated. See EJSCREEN Report in the docket.
---------------------------------------------------------------------------

    The availability of regulations.gov to submit written comments and 
a public hearing in Price, Utah provided meaningful opportunities for 
public participation in the proposed rulemaking. The EPA considered 
input received during the public comment period regarding environmental 
justice considerations.

L. Determination Under Section Clean Air Act Section 307(d)

    Pursuant to CAA sections 307(d)(1)(B) and 307(d)(1)(V), the 
Administrator determines that this action is subject to the provisions 
of section 307(d). CAA section 307(d)(1)(B) provides that section 
307(d) applies to, among other things, ``the promulgation or revision 
of an implementation plan by the Administrator under [CAA section 
110(c)].'' \99\ Under section 307(d)(1)(V), the provisions of section 
307(d) also apply to ``such other actions as the Administrator may 
determine.'' \100\ To the extent the approval of Utah's SIP submittals 
is not expressly identified under section 307(d), the Administrator 
hereby determines that section 307(d) applies to this aspect of this 
action. The agency has complied with the procedural requirements of CAA 
section 307(d) during the course of this rulemaking.
---------------------------------------------------------------------------

    \99\ 42 U.S.C. 7607(d)(1)(B).
    \100\ 42 U.S.C. 7607(d)(1)(V).
---------------------------------------------------------------------------

M. Congressional Review Act (CRA)

    This rule is exempt from the CRA because it is a rule of particular 
applicability that only applies to three named facilities.

N. Judicial Review

    Under section 307(b)(1) of the CAA, petitions for judicial review 
of this action must be filed in the United States Court of Appeals for 
the appropriate circuit by January 26, 2021. Filing a petition for 
reconsideration by the Administrator of this final rule does not affect 
the finality of this action for purposes of judicial review nor does it 
extend the time within which a petition for judicial review may be 
filed and shall not postpone the effectiveness of such rule or action. 
This action may not be challenged later in proceedings to enforce its 
requirements. See CAA section 307(b)(2).

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Incorporation by 
reference, Intergovernmental relations, Nitrogen dioxide, Particulate 
matter, Sulfur oxides.

Andrew Wheeler,
Administrator.

    For the reasons set forth in the preamble, 40 CFR part 52 is to be 
amended as follows:

[[Page 75873]]

PART 52--APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS

0
1. The authority citation for part 52 continues to read as follows:

    Authority:  42 U.S.C. 7401 et seq.

Subpart TT--Utah

0
2. In Sec.  52.2320:
0
a. The table in paragraph (c) is amended by revising the entries 
``R307-110-17,'' ``R307-110-28,'' and ``R307-150-03''.
0
b. The table in paragraph (e) is amended by:
0
i. Adding the entries ``Section IX.H.21. General Requirements: Control 
Measures for Area and Point Sources, Emission Limits and Operating 
Practices, Regional Haze Requirements'' and ``Section IX.H.22. Source 
Specific Emission Limitations: Regional Haze Requirements, Best 
Available Retrofit Technology'' in numerical order.
0
ii. Removing from under the center heading ``XVII. Visibility 
Protection'' the entries ``Progress Report for Utah's State 
Implementation Plan for Regional Haze,'' ``Section XX.D.6. Best 
Available Retrofit Technology (BART) Assessment for NOX and 
PM,'' and ``Section XX.G. Long-Term Strategy for Fire Programs.''
0
iii. Adding the center heading ``XX. Regional Haze'' and the entries 
``Section XX.A. Executive Summary'', ``Section XX.B. Background on the 
Regional Haze Rule'', ``Section XX.C. Long-Term Strategy for the Clean-
Air Corridor'', ``Section XX.D. Long-Term Strategy for Stationary 
Sources'', ``Section XX.E. Sulfur Dioxide Milestones and Backstop 
Trading Program'', ``Section XX.F. Long-Term Strategy for Mobile 
Sources'', ``Section XX.G. Long-Term Strategy for Fire Programs'', 
``Section XX.H. Assessment of Emissions from Paved and Unpaved Road 
Dust'', ``Section XX.I. Pollution Prevention and Renewable Energy 
Programs'', ``Section XX.J. Other GCVTC Recommendations'', ``Section 
XX.K. Projection of Visibility Improvement Anticipated from Long-Term 
Strategy'', ``Section XX.L. Periodic Implementation Plan Revisions'', 
``Section XX.M. State Planning/Interstate Coordination and Tribal 
Implementation'', ``Section XX.N. Enforceable Commitments for the Utah 
Regional Haze SIP'', and ``Progress Report for Utah's State 
Implementation Plan for Regional Haze'' in numerical order and after 
the entry ``Section XXIII. Interstate Transport''.
    The revisions and additions read as follows:


Sec.  52.2320  Identification of plan.

* * * * *
    (c) * * *

----------------------------------------------------------------------------------------------------------------
                                                        State       Final rule citation,
         Rule No.                 Rule title       effective date           date                 Comments
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
                            R307-110. General Requirements: State Implementation Plan
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
R307-110-17...............  Section IX. Control        11/25/2019  [INSERT Federal        ......................
                             Measures for Area                      Register CITATION]
                             and Point Sources,                     11/27/2020.
                             Part H, Emission
                             Limits.
 
                                                  * * * * * * *
R307-110-28...............  Section XX. Regional        8/15/2019  [INSERT Federal        ......................
                             Haze.                                  Register CITATION]
                                                                    11/27/2020.
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
                                         R307-150. Emission Inventories
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
R307-150-03...............  Applicability........       6/25/2019  [INSERT Federal        ......................
                                                                    Register CITATION]
                                                                    11/27/2020.
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------

* * * * *
    (e) * * *

----------------------------------------------------------------------------------------------------------------
                                               State
               Rule title                 effective date   Final rule citation, date           Comments
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
                                 IX. Control Measures for Area and Point Sources
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
Section IX.H.21. General Requirements:        11/25/2019  [INSERT Federal Register    ..........................
 Control Measures for Area and Point                       CITATION] 11/27/2020.
 Sources, Emission Limits and Operating
 Practices, Regional Haze Requirements.
Section IX.H.22. Source Specific              11/25/2019  [INSERT Federal Register    ..........................
 Emission Limitations: Regional Haze                       CITATION] 11/27/2020.
 Requirements, Best Available Retrofit
 Technology.

[[Page 75874]]

 
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
                                                XX. Regional Haze
----------------------------------------------------------------------------------------------------------------
Section XX.A. Executive Summary.........       8/15/2019  [INSERT Federal Register    ..........................
                                                           CITATION] 11/27/2020.
Section XX.B. Background on the Regional       8/15/2019  [INSERT Federal Register    ..........................
 Haze Rule.                                                CITATION] 11/27/2020.
Section XX.C. Long-Term Strategy for the       8/15/2019  [INSERT Federal Register    ..........................
 Clean-Air Corridor.                                       CITATION] 11/27/2020.
Section XX.D. Long-Term Strategy for           8/15/2019  [INSERT Federal Register    ..........................
 Stationary Sources.                                       CITATION] 11/27/2020.
Section XX.E. Sulfur Dioxide Milestones        8/15/2019  [INSERT Federal Register    ..........................
 and Backstop Trading Program.                             CITATION] 11/27/2020.
Section XX.F. Long-Term Strategy for           8/15/2019  [INSERT Federal Register    ..........................
 Mobile Sources.                                           CITATION] 11/27/2020.
Section XX.G. Long-Term Strategy for            4/7/2011  [INSERT Federal Register    ..........................
 Fire Programs.                                            CITATION] 11/27/2020.
Section XX.H. Assessment of Emissions          8/15/2019  [INSERT Federal Register    ..........................
 from Paved and Unpaved Road Dust.                         CITATION] 11/27/2020.
Section XX.I. Pollution Prevention and         8/15/2019  [INSERT Federal Register    ..........................
 Renewable Energy Programs.                                CITATION] 11/27/2020.
Section XX.J. Other GCVTC                      8/15/2019  [INSERT Federal Register    ..........................
 Recommendations.                                          CITATION] 11/27/2020.
Section XX.K. Projection of Visibility         8/15/2019  [INSERT Federal Register    ..........................
 Improvement Anticipated from Long-Term                    CITATION] 11/27/2020.
 Strategy.
Section XX.L. Periodic Implementation          8/15/2019  [INSERT Federal Register    ..........................
 Plan Revisions.                                           CITATION] 11/27/2020.
Section XX.M. State Planning/Interstate        8/15/2019  [INSERT Federal Register    ..........................
 Coordination and Tribal Implementation.                   CITATION] 11/27/2020.
Section XX.N. Enforceable Commitments          8/15/2019  [INSERT Federal Register    ..........................
 for the Utah Regional Haze SIP.                           CITATION] 11/27/2020.
Progress Report for Utah's State                2/4/2016  85 FR 64050, 10/9/2020....  ..........................
 Implementation Plan for Regional Haze.
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------

Sec.  52.2336   [Removed and Reserved]

0
3. Remove and reserve Sec.  52.2336.

[FR Doc. 2020-23994 Filed 11-25-20; 8:45 am]
BILLING CODE 6560-50-P