Document ID: EPA-R04-OAR-2018-0073-0001
Agency: epa
Document Type: Proposed Rule
Title: Air Quality State Implementation Plans; Approvals and Promulgations: South Carolina; Regional Haze Plan and Prong 4 (Visibility) for the 2012 PM2.5, 2010 NO2, 2010 SO2, and 2008 Ozone NAAQS
Posted Date: 2018-06-04T04:00Z

[Federal Register Volume 83, Number 107 (Monday, June 4, 2018)]
[Proposed Rules]
[Pages 25604-25608]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-11824]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R04-OAR-2018-0073; FRL-9978-92--Region 4]

Air Plan Approval; SC; Regional Haze Plan and Prong 4 
(Visibility) for the 2012 PM2.5, 2010 NO2, 2010 SO2, and 2008 Ozone 
NAAQS

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: The Environmental Protection Agency (EPA) is proposing to take 
the following four actions regarding the South Carolina State 
Implementation Plan (SIP): Approve the portion of South Carolina's 
September 5, 2017, SIP submittal seeking to change reliance from the 
Clean Air Interstate Rule (CAIR) to the Cross-State Air Pollution Rule 
(CSAPR) for certain regional haze requirements; convert EPA's limited 
approval/limited disapproval of South Carolina's regional haze plan to 
a full approval; remove EPA's Federal Implementation Plan (FIP) for 
South Carolina, which replaced reliance on CAIR with reliance on CSAPR 
to address the deficiencies identified in the limited disapproval of 
South Carolina's regional haze plan; and convert the conditional 
approvals of the visibility prong of South Carolina's infrastructure 
SIP submittals for the 2012 Fine Particulate Matter (PM2.5), 
2010 Nitrogen Dioxide (NO2), 2010 Sulfur Dioxide 
(SO2), and 2008 8-hour Ozone National Ambient Air Quality 
Standards (NAAQS) to full approvals.

DATES: Comments must be received on or before July 5, 2018.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R04-
OAR-2018-0073 at http://www.regulations.gov. Follow the online 
instructions for submitting comments. Once submitted, comments cannot 
be edited or removed from Regulations.gov. EPA may publish any comment 
received to its public docket. Do not submit electronically any 
information you consider to be Confidential Business Information (CBI) 
or other information whose disclosure is restricted by statute. 
Multimedia submissions (audio, video, etc.) must be accompanied by a 
written comment. The written comment is considered the official comment 
and should include discussion of all points you wish to make. EPA will 
generally not consider comments or comment contents located outside of 
the primary submission (i.e., on the web, cloud, or other file sharing 
system). For additional submission methods, the full EPA public comment 
policy, information about CBI or multimedia submissions, and general 
guidance on making effective comments, please visit http://www2.epa.gov/dockets/commenting-epa-dockets.

FOR FURTHER INFORMATION CONTACT: Michele Notarianni, Air Regulatory 
Management Section, Air Planning and Implementation Branch, Air, 
Pesticides and Toxics Management Division, U.S. Environmental 
Protection Agency, Region 4, 61 Forsyth Street SW, Atlanta, Georgia 
30303-8960. Ms. Notarianni can be reached by telephone at (404) 562-
9031 or via electronic mail at [email protected].

SUPPLEMENTARY INFORMATION: 

I. Background

A. Regional Haze Plans and Their Relationship With CAIR and CSAPR

    Section 169A(b)(2)(A) of the Clean Air Act (CAA or Act) requires 
states to submit regional haze plans that contain such measures as may 
be necessary to make reasonable progress towards the natural visibility 
goal, including a requirement that certain categories of existing major 
stationary sources built between 1962 and 1977 procure, install, and 
operate Best Available Retrofit Technology (BART) as determined by the 
state. Under the Regional Haze Rule (RHR), states are directed to 
conduct BART determinations for such ``BART-eligible'' sources that may 
be anticipated to cause or contribute to any visibility impairment in a 
Class I area. Rather than requiring source-specific BART controls, 
states also have the flexibility to adopt an emissions trading program 
or other alternative program as long as the alternative provides 
greater reasonable progress towards improving visibility than BART. See 
40 CFR 51.308(e)(2). EPA provided states with this flexibility in the 
RHR, adopted in 1999, and further refined the criteria for assessing 
whether an alternative program provides for greater reasonable progress 
in two subsequent rulemakings. See 64 FR 35714 (July 1, 1999); 70 FR 
39104 (July 6, 2005); 71 FR 60612 (October 13, 2006).
    EPA demonstrated that CAIR would achieve greater reasonable 
progress than BART in revisions to the regional haze program made in 
2005.\1\ See 70 FR 39104 (July 6, 2005). In those revisions, EPA 
amended its regulations to provide that states participating in the 
CAIR cap-and-trade programs pursuant to an EPA-approved CAIR SIP or 
states that remain subject to a CAIR FIP need not require affected 
BART-eligible electric generating units (EGUs) to install, operate, and 
maintain BART for emissions of SO2 and nitrogen oxides 
(NOX). As a result of EPA's determination that CAIR was 
``better-than-BART,'' a number of states in the CAIR region, including 
South Carolina, relied on the CAIR cap-and-trade programs as an 
alternative to BART for EGU emissions of SO2 and 
NOX in designing their regional haze plans. These states 
also relied on CAIR as an element of a long-term strategy (LTS) for 
achieving their reasonable progress goals (RPGs) for their regional 
haze programs. However, in 2008, the United States Court of Appeals for 
the District of Columbia Circuit (D.C. Circuit) remanded CAIR to EPA 
without vacatur to preserve the environmental benefits provided by 
CAIR. North Carolina v. EPA, 550 F.3d 1176, 1178 (DC Cir. 2008). On 
August 8, 2011 (76 FR 48208), acting on the D.C. Circuit's remand, EPA 
promulgated CSAPR to replace CAIR and issued FIPs to implement the rule 
in CSAPR-subject states.\2\ Implementation of CSAPR was scheduled to 
begin on January 1, 2012, when CSAPR would have superseded the CAIR 
program.
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    \1\ CAIR created regional cap-and-trade programs to reduce 
SO2 and NOX emissions in 27 eastern states 
(and the District of Columbia), including South Carolina, that 
contributed to downwind nonattainment or interfered with maintenance 
of the 1997 8-hour ozone NAAQS or the 1997 PM2.5 NAAQS.
    \2\ CSAPR requires 28 eastern states to limit their statewide 
emissions of SO2 and/or NOX in order to 
mitigate transported air pollution unlawfully impacting other 
states' ability to attain or maintain four NAAQS: The 1997 ozone 
NAAQS, the 1997 annual PM2.5 NAAQS, the 2006 24-hour 
PM2.5 NAAQS, and the 2008 8-hour ozone NAAQS. The CSAPR 
emissions limitations are defined in terms of maximum statewide 
``budgets'' for emissions of annual SO2, annual 
NOX, and/or ozone-season NOX by each covered 
state's large EGUs. The CSAPR state budgets are implemented in two 
phases of generally increasing stringency, with the Phase 1 budgets 
applying to emissions in 2015 and 2016 and the Phase 2 budgets 
applying to emissions in 2017 and later years.
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    Due to the D.C. Circuit's 2008 ruling that CAIR was ``fatally 
flawed'' and its resulting status as a temporary measure following that 
ruling, EPA could not fully approve regional haze plans to the extent 
that they relied on CAIR to satisfy the BART requirement and the

[[Page 25605]]

requirement for a LTS sufficient to achieve the state-adopted RPGs. On 
these grounds, EPA finalized a limited disapproval of South Carolina's 
regional haze plan on June 7, 2012 (77 FR 33642), and in the same 
action, promulgated a FIP to replace reliance on CAIR with reliance on 
CSAPR to address the deficiencies in South Carolina's regional haze 
plan. EPA finalized a limited approval of South Carolina's regional 
haze plan on June 28, 2012 (77 FR 38509), as meeting the remaining 
applicable regional haze requirements set forth in the CAA and the RHR.
    In the June 7, 2012, limited disapproval action, EPA also amended 
the RHR to provide that participation by a state's EGUs in a CSAPR 
trading program for a given pollutant--either a CSAPR federal trading 
program implemented through a CSAPR FIP or an integrated CSAPR state 
trading program implemented through an approved CSAPR SIP revision--
qualifies as a BART alternative for those EGUs for that pollutant. See 
40 CFR 51.308(e)(4). Since EPA promulgated this amendment, numerous 
states covered by CSAPR have come to rely on the provision through 
either SIPs or FIPs.\3\
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    \3\ EPA has promulgated FIPs relying on CSAPR participation for 
BART purposes for Georgia, Indiana, Iowa, Kentucky, Michigan, 
Missouri, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia, 
and West Virginia (77 FR at 33654) and Nebraska (77 FR 40150 (July 
6, 2012)). EPA has approved SIPs from several states relying on 
CSAPR participation for BART purposes. See, e.g., 82 FR 47393 
(October 12, 2017) for Alabama; 77 FR 34801 (June 12, 2012) for 
Minnesota; and 77 FR 46952 (August 7, 2012) for Wisconsin.
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    Numerous parties filed petitions for review of CSAPR in the D.C. 
Circuit, and on August 21, 2012, the court issued its ruling, vacating 
and remanding CSAPR to EPA and ordering continued implementation of 
CAIR. EME Homer City Generation, L.P. v. EPA, 696 F.3d 7, 38 (D.C. Cir. 
2012). The D.C. Circuit's vacatur of CSAPR was reversed by the United 
States Supreme Court on April 29, 2014, and the case was remanded to 
the D.C. Circuit to resolve remaining issues in accordance with the 
high court's ruling. EPA v. EME Homer City Generation, L.P., 134 S. Ct. 
1584 (2014). On remand, the D.C. Circuit affirmed CSAPR in most 
respects, but invalidated without vacating some of the CSAPR budgets to 
a number of states. EME Homer City Generation, L.P. v. EPA, 795 F.3d 
118 (D.C. Cir. 2015). The remanded budgets include the Phase 2 
SO2 emissions budgets for Alabama, Georgia, South Carolina, 
and Texas and the Phase 2 ozone-season NOX budgets for 11 
states. This litigation ultimately delayed implementation of CSAPR for 
three years, from January 1, 2012, when CSAPR's cap-and-trade programs 
were originally scheduled to replace the CAIR cap-and-trade programs, 
to January 1, 2015. Thus, the rule's Phase 2 budgets that were 
originally promulgated to begin on January 1, 2014, began on January 1, 
2017.
    On September 29, 2017 (82 FR 45481), EPA issued a final rule 
affirming the continued validity of the Agency's 2012 determination 
that participation in CSAPR meets the RHR's criteria for an alternative 
to the application of source-specific BART.\4\ EPA has determined that 
changes to CSAPR's geographic scope resulting from the actions EPA has 
taken or expects to take in response to the D.C. Circuit's budget 
remand do not affect the continued validity of participation in CSAPR 
as a BART alternative, because the changes in geographic scope would 
not have adversely affected the results of the air quality modeling 
analysis upon which EPA based the 2012 determination. EPA's September 
29, 2017, determination was based, in part, on EPA's final action 
approving a SIP revision from Alabama (81 FR 59869 (August 31, 2016)) 
adopting Phase 2 annual NOX and SO2 budgets 
equivalent to the federally-developed budgets and on SIP revisions 
submitted by Georgia and South Carolina to also adopt Phase 2 annual 
NOX and SO2 budgets equivalent to the federally-
developed budgets.\5\ Since that time, EPA has approved the SIP 
revisions from Georgia and South Carolina. See 82 FR 47930 (October 13, 
2017) and 82 FR 47936 (October 13, 2017), respectively.
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    \4\ Legal challenges to this rule are pending. Nat'l Parks 
Conservation Ass'n v. EPA, No. 17-1253 (DC Cir. filed November 28, 
2017).
    \5\ EPA proposed to approve the Georgia and South Carolina SIP 
revisions adopting CSAPR budgets on August 16, 2017 (82 FR 38866), 
and August 10, 2017 (82 FR 37389), respectively.
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    A portion of South Carolina's September 5, 2017, SIP submittal 
seeks to correct the deficiencies identified in the June 7, 2012, 
limited disapproval of its regional haze plan submitted on December 17, 
2007, by replacing reliance on CAIR with reliance on CSAPR.\6\ EPA is 
proposing to approve South Carolina's request that EPA amend the 
State's regional haze plan by replacing its reliance on CAIR with 
CSAPR. EPA is proposing to approve the regional haze portion of the SIP 
submittal and amend the SIP accordingly.
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    \6\ On October 13, 2017 (82 FR 47936), EPA approved the portions 
of the September 5, 2017, SIP submission incorporating into South 
Carolina's SIP the State's regulations requiring South Carolina EGUs 
to participate in CSAPR state trading programs for annual 
NOX and SO2 emissions integrated with the 
CSAPR federal trading programs and thus replacing the corresponding 
FIP requirements. In the October 13, 2017, action, EPA did not take 
any action regarding South Carolina's request in this September 5, 
2017, SIP submission to revise the State's regional haze plan nor 
regarding the prong 4 element of the 2008 8-hour ozone, 2010 1-hour 
NO2, 2010 1-hour SO2, and 2012 
PM2.5 NAAQS.
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B. Infrastructure SIPs

    By statute, plans meeting the requirements of sections 110(a)(1) 
and (2) of the CAA are to be submitted by states within three years (or 
less, if the Administrator so prescribes) after promulgation of a new 
or revised NAAQS to provide for the implementation, maintenance, and 
enforcement of the new or revised NAAQS. EPA has historically referred 
to these SIP submissions made for the purpose of satisfying the 
requirements of sections 110(a)(1) and 110(a)(2) as ``infrastructure 
SIP'' submissions. Sections 110(a)(1) and (2) require states to address 
basic SIP elements such as for monitoring, basic program requirements, 
and legal authority that are designed to assure attainment and 
maintenance of the newly established or revised NAAQS. More 
specifically, section 110(a)(1) provides the procedural and timing 
requirements for infrastructure SIP submissions. Section 110(a)(2) 
lists specific elements that states must meet for the infrastructure 
SIP requirements related to a newly established or revised NAAQS. The 
contents of an infrastructure SIP submission may vary depending upon 
the data and analytical tools available to the state, as well as the 
provisions already contained in the state's implementation plan at the 
time in which the state develops and submits the submission for a new 
or revised NAAQS.
    Section 110(a)(2)(D) has two components: 110(a)(2)(D)(i) and 
110(a)(2)(D)(ii). Section 110(a)(2)(D)(i) includes four distinct 
components, commonly referred to as ``prongs,'' that must be addressed 
in infrastructure SIP submissions. The first two prongs, which are 
codified in section 110(a)(2)(D)(i)(I), are provisions that prohibit 
any source or other type of emissions activity in one state from 
contributing significantly to nonattainment of the NAAQS in another 
state (prong 1) and from interfering with maintenance of the NAAQS in 
another state (prong 2). The third and fourth prongs, which are 
codified in section 110(a)(2)(D)(i)(II), are provisions that prohibit 
emissions activity in one state

[[Page 25606]]

from interfering with measures required to prevent significant 
deterioration of air quality in another state (prong 3) or from 
interfering with measures to protect visibility in another state (prong 
4). Section 110(a)(2)(D)(ii) requires SIPs to include provisions 
ensuring compliance with sections 115 and 126 of the Act, relating to 
interstate and international pollution abatement.
    Through this action, EPA is proposing to convert the conditional 
approvals of the prong 4 portions of South Carolina's infrastructure 
SIP submissions for the 2008 8-hour Ozone, 2010 1-hour NO2, 
2010 1-hour SO2, and 2012 annual PM2.5 NAAQS to 
full approvals, as discussed in section III of this notice.\7\ All 
other applicable infrastructure SIP requirements for these SIP 
submissions have been or will be addressed in separate rulemakings. A 
brief background regarding the NAAQS relevant to this proposal is 
provided below. For comprehensive information on these NAAQS, please 
refer to the Federal Register notices cited in the following 
subsections.
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    \7\ On August 22, 2016, EPA conditionally approved the prong 4 
portions of South Carolina's July 17, 2012, 2008 8-hour Ozone 
submission; April 30, 2014, 2010 1-hour NO2 submission; 
May 8, 2014, 2010 1-hour SO2 submission; and December 18, 
2015, 2012 annual PM2.5 NAAQS submission. See 81 FR 
56512. The notice of final rulemaking for the conditional approval 
inadvertently identified the date of South Carolina's infrastructure 
SIP for the 2008 8-hour ozone NAAQS as July 17, 2008, rather than 
the correct date of July 17, 2012, presented in the notice of 
proposed rulemaking (81 FR 36842 (June 8, 2016)).
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1. 2010 1-Hour SO2 NAAQS
    On June 2, 2010, EPA revised the 1-hour primary SO2 
NAAQS to an hourly standard of 75 parts per billion (ppb) based on a 3-
year average of the annual 99th percentile of 1-hour daily maximum 
concentrations. See 75 FR 35520 (June 22, 2010). States were required 
to submit infrastructure SIP submissions for the 2010 1-hour 
SO2 NAAQS to EPA no later than June 2, 2013. South Carolina 
submitted an infrastructure SIP submission for the 2010 1-hour 
SO2 NAAQS on May 8, 2014. This proposed action only 
addresses the prong 4 element of that submission.\8\
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    \8\ With the exception of the interstate transport requirements 
of section 110(a)(2)(D)(i)(I) and (II) (prongs 1, 2, and 4), the 
other portions of South Carolina's May 8, 2014, 2010 1-hour 
SO2 infrastructure submission were addressed in a 
separate action. See 81 FR 32651 (May 24, 2016).
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2. 2010 1-Hour NO2 NAAQS
    On January 22, 2010, EPA promulgated a new 1-hour primary NAAQS for 
NO2 at a level of 100 ppb, based on a 3-year average of the 
98th percentile of the yearly distribution of 1-hour daily maximum 
concentrations. See 75 FR 6474 (February 9, 2010). States were required 
to submit infrastructure SIP submissions for the 2010 1-hour 
NO2 NAAQS to EPA no later than January 22, 2013. South 
Carolina submitted an infrastructure SIP submission for the 2010 1-hour 
NO2 NAAQS on April 30, 2014. This proposed action only 
addresses the prong 4 element of this submission.\9\
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    \9\ With the exception of the PSD permitting requirements for 
major sources of sections 110(a)(2)(C), prong 3 of D(i), and (J) and 
the interstate transport requirements of section 110(a)(2)(D)(i)(I) 
and (II) (prongs 1, 2, and 4), the other portions of South 
Carolina's April 30, 2014, 2010 1-hour NO2 infrastructure 
submission were addressed in a separate action. See 81 FR 63704 
(September 16, 2016). EPA previously acted on the PSD elements of 
sections 110(a)(2)(C), prong 3 of D(i), and (J) of South Carolina's 
April 30, 2014, SIP submission in a separate action. See 80 FR 14019 
(March 18, 2015). EPA acted on South Carolina's December 7, 2016, 
SIP submission addressing prongs 1 and 2 for the 2010 NO2 
NAAQS in a separate action. See 82 FR 45995 (October 3, 2017).
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3. 2012 PM2.5 NAAQS
    On December 14, 2012, EPA revised the annual primary 
PM2.5 NAAQS to 12 micrograms per cubic meter ([mu]g/m\3\). 
See 78 FR 3086 (January 15, 2013). States were required to submit 
infrastructure SIP submissions for the 2012 PM2.5 NAAQS to 
EPA no later than December 14, 2015. South Carolina submitted an 
infrastructure SIP submission for the 2012 PM2.5 NAAQS on 
December 18, 2015. This proposed action only addresses the prong 4 
element of that submission.\10\
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    \10\ With the exception of the interstate transport requirements 
of section 110(a)(2)(D)(i)(I) and (II) (prongs 1, 2, and 4), the 
other portions of South Carolina's December 18, 2015, 
PM2.5 infrastructure submission were addressed in a 
separate action. See 82 FR 16930 (April 7, 2017). No action has been 
taken with respect to prongs 1 and 2 for the 2012 annual 
PM2.5 NAAQS.
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4. 2008 8-Hour Ozone NAAQS
    On March 12, 2008, EPA revised the 8-hour Ozone NAAQS to 0.075 
parts per million. See 73 FR 16436 (March 27, 2008). States were 
required to submit infrastructure SIP submissions for the 2008 8-hour 
Ozone NAAQS to EPA no later than March 12, 2011. South Carolina 
submitted an infrastructure SIP for the 2008 8-hour Ozone NAAQS on July 
17, 2012. This proposed action only addresses the prong 4 element of 
that submission.\11\
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    \11\ With the exception of the PSD permitting requirements for 
major sources of sections 110(a)(2)(C) and (J), the interstate 
transport requirements of section 110(a)(2)(D)(i)(I) and (II) 
(prongs 1 through 4), and the visibility requirements of section 
110(a)(2)(J), the other portions of South Carolina's July 17, 2012, 
2008 ozone infrastructure SIP submission were addressed in a 
separate action. See 80 FR 11136 (March 2, 2015). EPA subsequently 
acted on the PSD elements of sections 110(a)(2)(C), prong 3 of D(i), 
and (J) of South Carolina's July 17, 2012, SIP submission in a 
separate action. See 80 FR 14019 (March 18, 2015).
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II. What are the prong 4 requirements?

    CAA section 110(a)(2)(D)(i)(II) requires a state's implementation 
plan to contain provisions prohibiting sources in that state from 
emitting pollutants in amounts that interfere with any other state's 
efforts to protect visibility under part C of the CAA (which includes 
sections 169A and 169B). EPA most recently issued guidance for 
infrastructure SIPs on September 13, 2013 (2013 Guidance).\12\ The 2013 
Guidance states that these prong 4 requirements can be satisfied by 
approved SIP provisions that EPA has found to adequately address any 
contribution of that state's sources that impacts the visibility 
program requirements in other states. The 2013 Guidance also states 
that EPA interprets this prong to be pollutant-specific, such that the 
infrastructure SIP submission need only address the potential for 
interference with protection of visibility caused by the pollutant 
(including precursors) to which the new or revised NAAQS applies.
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    \12\ ``Guidance on Infrastructure State Implementation Plan 
(SIP) Elements under Clean Air Act Sections 110(a)(1) and 
110(a)(2),'' Memorandum from Stephen D. Page, September 13, 2013.
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    The 2013 Guidance lays out how a state's infrastructure SIP 
submission may satisfy prong 4. One way that a state can meet the 
requirements is via confirmation in its infrastructure SIP submission 
that the state has an approved regional haze plan that fully meets the 
requirements of 40 CFR 51.308 or 51.309. 40 CFR 51.308 and 51.309 
specifically require that a state participating in a regional planning 
process include all measures needed to achieve its apportionment of 
emission reduction obligations agreed upon through that process. A 
fully approved regional haze plan will ensure that emissions from 
sources under an air agency's jurisdiction are not interfering with 
measures required to be included in other air agencies' plans to 
protect visibility.
    Alternatively, in the absence of a fully approved regional haze 
plan, a state may meet the requirements of prong 4 through a 
demonstration in its infrastructure SIP submission that emissions 
within its jurisdiction do not interfere with other air agencies' plans 
to protect visibility. Such an infrastructure SIP submission would need 
to include measures to limit visibility-impairing pollutants and

[[Page 25607]]

ensure that the reductions conform with any mutually agreed regional 
haze RPGs for mandatory Class I areas in other states.

III. What is EPA's analysis of how South Carolina addressed prong 4 and 
regional haze?

    South Carolina's July 17, 2012, 2008 8-hour Ozone submission; April 
30, 2014, 2010 1-hour NO2 submission; May 8, 2014, 2010 1-
hour SO2 submission; and December 18, 2015, 2012 annual 
PM2.5 submission rely on the State having a fully approved 
regional haze plan to satisfy its prong 4 requirements.\13\ However, 
EPA has not fully approved South Carolina's regional haze plan, as the 
Agency issued a limited disapproval of the State's original regional 
haze plan on June 7, 2012, due to its reliance on CAIR.
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    \13\ The April 30, 2014, 2010 1-hour NO2 submission; 
May 8, 2014, 2010 1-hour SO2 submission; and December 18, 
2015, 2012 annual PM2.5 submission also cite to the 
State's December 2012 regional haze progress report.
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    On April 19, 2016, South Carolina submitted a commitment letter to 
EPA to submit a SIP revision that adopts provisions for participation 
in the CSAPR annual NOX and annual SO2 trading 
programs, including annual NOX and annual SO2 
budgets that are at least as stringent as the budgets codified for 
South Carolina, and revises its regional haze plan to replace reliance 
on CAIR with CSAPR for certain regional haze provisions. In its letter, 
South Carolina committed to providing this SIP revision within one year 
of EPA's final conditional approval of the prong 4 portions of the 
infrastructure SIP revisions. On August 22, 2016 (81 FR 56512), EPA 
conditionally approved the prong 4 portion of South Carolina's 
infrastructure SIP submissions for the 2008 8-hour Ozone, 2010 1-hour 
NO2, 2010 1-hour SO2, and 2012 annual 
PM2.5 NAAQS based on this commitment letter from the State. 
In accordance with the State's April 19, 2016, commitment letter, South 
Carolina submitted a SIP revision on September 5, 2017, to adopt 
provisions for participation in the CSAPR annual NOX and 
annual SO2 trading programs and to replace reliance on CAIR 
with reliance on CSAPR for certain regional haze provisions. As noted 
above, EPA approved the portion of South Carolina's September 5, 2017, 
SIP revision adopting CSAPR. See 82 FR 47936 (October 13, 2017).
    EPA is proposing to approve the regional haze portion of the 
State's September 5, 2017, SIP revision replacing reliance on CAIR with 
CSAPR, and to convert EPA's previous action on South Carolina's 
regional haze plan from a limited approval/limited disapproval to a 
full approval because final approval of this portion of the SIP 
revision would correct the deficiencies that led to EPA's limited 
approval/limited disapproval of the State's regional haze plan. 
Specifically, EPA's approval of the regional haze portion of South 
Carolina's September 5, 2017, SIP revision would satisfy the 
SO2 and NOX BART requirements and first 
implementation period SO2 reasonable progress requirements 
for EGUs formerly subject to CAIR and the requirement that a LTS 
include measures as necessary to achieve the state-adopted RPGs. Thus, 
EPA is also proposing to remove EPA's FIP for South Carolina which 
replaced reliance on CAIR with reliance on CSAPR to address the 
deficiencies identified in the limited disapproval of South Carolina's 
regional haze plan. Because a state may satisfy prong 4 requirements 
through a fully approved regional haze plan, EPA is therefore also 
proposing to convert the conditional approvals to full approvals of the 
prong 4 portion of South Carolina's July 17, 2012, 2008 8-hour Ozone 
submission; April 30, 2014, 2010 1-hour NO2 submission; May 
8, 2014, 2010 1-hour SO2 submission; and December 18, 2015, 
2012 annual PM2.5 submission.

IV. Proposed Action

    As described above, EPA is proposing to take the following actions: 
(1) Approve the regional haze plan portion of South Carolina's 
September 5, 2017, SIP submission to change reliance from CAIR to 
CSAPR; (2) convert EPA's limited approval/limited disapproval of South 
Carolina's December 17, 2007, regional haze plan to a full approval; 
(3) remove EPA's FIP for South Carolina which replaced reliance on CAIR 
with reliance on CSAPR to address the deficiencies identified in the 
limited disapproval of South Carolina's regional haze plan; and (4) 
convert EPA's September 26, 2016, conditional approvals to full 
approvals of the prong 4 portion of South Carolina's July 17, 2012, 
2008 8-hour Ozone submission; April 30, 2014, 2010 1-hour 
NO2 submission; May 8, 2014, 2010 1-hour SO2 
submission; and December 18, 2015, 2012 annual PM2.5 
submission. All other applicable infrastructure requirements for the 
infrastructure SIP submissions have been or will be addressed in 
separate rulemakings.

V. Statutory and Executive Order Reviews

    Under the CAA, the Administrator is required to approve a SIP 
submission that complies with the provisions of the Act and applicable 
Federal regulations. See 42 U.S.C. 7410(k); 40 CFR 52.02(a). Thus, in 
reviewing SIP submissions, EPA's role is to approve state choices, 
provided that they meet the criteria of the CAA. Accordingly, these 
proposed actions merely propose to approve state law as meeting Federal 
requirements and remove a FIP, and do not impose additional 
requirements beyond those imposed by state law. For that reason, these 
proposed actions:
     Are not significant regulatory actions subject to review 
by the Office of Management and Budget under Executive Orders 12866 (58 
FR 51735, October 4, 1993) and 13563 (76 FR 3821, January 21, 2011);
     Are not Executive Order 13771 (82 FR 9339, February 2, 
2017) regulatory actions because SIP approvals are exempted under 
Executive Order 12866;
     Do not impose an information collection burden under the 
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
     Are certified as not having a significant economic impact 
on a substantial number of small entities under the Regulatory 
Flexibility Act (5 U.S.C. 601 et seq.);
     Do not contain any unfunded mandate or significantly or 
uniquely affect small governments, as described in the Unfunded 
Mandates Reform Act of 1995 (Pub. L. 104-4);
     Do not have Federalism implications as specified in 
Executive Order 13132 (64 FR 43255, August 10, 1999);
     Are not economically significant regulatory actions based 
on health or safety risks subject to Executive Order 13045 (62 FR 
19885, April 23, 1997);
     Are not significant regulatory actions subject to 
Executive Order 13211 (66 FR 28355, May 22, 2001);
     Are not subject to requirements of Section 12(d) of the 
National Technology Transfer and Advancement Act of 1995 (15 U.S.C. 272 
note) because application of those requirements would be inconsistent 
with the CAA; and
     Do not provide EPA with the discretionary authority to 
address, as appropriate, disproportionate human health or environmental 
effects, using practicable and legally permissible methods, under 
Executive Order 12898 (59 FR 7629, February 16, 1994).
    In addition, these proposed actions for South Carolina do not have 
Tribal implications as specified by Executive Order 13175 (65 FR 67249, 
November 9, 2000) because they do not have substantial direct effects 
on an Indian Tribe. The Catawba Indian Nation Reservation is located 
within the boundary of York County, South

[[Page 25608]]

Carolina. Pursuant to the Catawba Indian Claims Settlement Act, S.C. 
Code Ann. 27-16-120, ``all state and local environmental laws and 
regulations apply to the [Catawba Indian Nation] and Reservation and 
are fully enforceable by all relevant state and local agencies and 
authorities.'' However, EPA has determined that this proposed rule does 
not have substantial direct effects on an Indian Tribe because, as it 
relates to prong 4, this proposed action is not approving any specific 
rule, but rather proposing to determine that South Carolina's already 
approved SIP meets certain CAA requirements. As it relates to the 
regional haze SIP, the proposal to replace reliance on CAIR with 
reliance on CSAPR has no substantial direct effects because the 
reliance on CSAPR for regional haze purposes in South Carolina already 
existed through a FIP. EPA notes that these proposed actions will not 
impose substantial direct costs on Tribal governments or preempt Tribal 
law.

List of Subjects in 40 CFR Part 52

    Environmental protection, Administrative practice and procedure, 
Air pollution control, Incorporation by reference, Intergovernmental 
relations, Nitrogen dioxide, Ozone, Particulate Matter, Reporting and 
recordkeeping requirements, Sulfur oxides.

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

    Dated: May 18, 2018.
Onis ``Trey'' Glenn, III,
Regional Administrator, Region 4.
[FR Doc. 2018-11824 Filed 6-1-18; 8:45 am]
 BILLING CODE 6560-50-P