Air Plan Approval; South Carolina; Catawba Indian Nation Portion of the Charlotte-Gastonia-Rock Hill Area Limited Maintenance Plan for the 1997 8-Hour Ozone NAAQS, 67402-67408 [2021-25527]
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Federal Register / Vol. 86, No. 225 / Friday, November 26, 2021 / Proposed Rules
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[Amended]
3. Amend § 240.14a–9 by removing
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By the Commission.
Dated: November 17, 2021.
J. Matthew DeLesDernier,
Assistant Secretary.
[FR Doc. 2021–25420 Filed 11–24–21; 8:45 am]
BILLING CODE 8011–01–P
ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
[EPA–R04–OAR–2020–0677; FRL–9276–01–
R4]
Air Plan Approval; South Carolina;
Catawba Indian Nation Portion of the
Charlotte-Gastonia-Rock Hill Area
Limited Maintenance Plan for the 1997
8-Hour Ozone NAAQS
Environmental Protection
Agency (EPA).
ACTION: Proposed rule.
AGENCY:
The Environmental Protection
Agency (EPA) is proposing to approve a
state implementation plan (SIP) revision
submitted by the State of South
Carolina, through the Department of
Health and Environmental Control
(DHEC), via a letter dated July 7, 2020.
The SIP revision includes the 1997 8hour ozone national ambient air quality
standards (NAAQS) Limited
Maintenance Plan (LMP) for the
Catawba Indian Nation portion
(hereinafter referred to as the Catawba
Area) of the Charlotte-Gastonia-Rock
Hill NC-SC 1997 8-hour ozone
maintenance area (hereinafter referred
to as the Charlotte NC-SC 1997 8-hour
NAAQS Area). The Charlotte NC-SC
1997 8-hour NAAQS Area is comprised
of Cabarrus, Gaston, Lincoln,
Mecklenburg, Rowan, Union and a
portion of Iredell County (i.e., Davidson
and Coddle Creek Townships) in North
Carolina and a portion of York County,
SUMMARY:
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South Carolina which includes the
Catawba Area. EPA is proposing to
approve the Catawba Area LMP because
it provides for the maintenance of the
1997 8-hour ozone NAAQS within the
Catawba Area through the end of the
second 10-year portion of the
maintenance period. The effect of this
action would be to make certain
commitments related to maintenance of
the 1997 8-hour ozone NAAQS in the
Catawba Area federally enforceable as
part of the South Carolina SIP.
DATES: Written comments must be
received at the address below on or
before December 27, 2021.
ADDRESSES: Submit your comments,
identified by Docket ID No. EPA–R04–
OAR–2020–0677 at https://
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
https://www2.epa.gov/dockets/
commenting-epa-dockets.
FOR FURTHER INFORMATION CONTACT: Jane
Spann, Air Regulatory Management
Section, Air Planning and
Implementation Branch, Air and
Radiation Division, U.S. Environmental
Protection Agency, Region 4, 61 Forsyth
Street SW, Atlanta, Georgia 30303–8960.
The telephone number is (404) 562–
9029. Ms. Spann can also be reached via
electronic mail at spann.jane@epa.gov.
SUPPLEMENTARY INFORMATION:
Table of Contents
I. Summary of EPA’s Proposed Action
II. Background
III. South Carolina’s SIP Submittal
IV. EPA’s Evaluation of South Carolina’s SIP
Submittal
A. Area Characteristics
B. Attainment Emissions Inventory
C. Maintenance Demonstration
D. Monitoring Network and Verification of
Continued Attainment
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E. Contingency Plan
F. Conclusion
V. Transportation Conformity and General
Conformity
VI. Proposed Action
VII. Statutory and Executive Order Reviews
I. Summary of EPA’s Proposed Action
In accordance with the Clean Air Act
(CAA or Act), EPA is proposing to
approve the Catawba Area LMP for the
1997 8-hour ozone NAAQS, adopted by
DHEC on July 7, 2020, and submitted by
DHEC as a revision to the South
Carolina SIP under a letter dated July 7,
2020.1 In 2004, the Charlotte NC-SC
1997 8-hour NAAQS Area, which
includes the Catawba Area, was
designated as nonattainment for the
1997 8-hour ozone NAAQS.
Subsequently, in 2012, after a clean data
determination 2 and EPA’s approval of a
maintenance plan, the South Carolina
portion of the Charlotte NC-SC 1997 8hour NAAQS Area, which includes the
Catawba Area, was redesignated to
attainment for the 1997 8-hour ozone
NAAQS.
The Catawba Area LMP is designed to
maintain the 1997 8-hour ozone NAAQS
within the Catawba Area through the
end of the second 10-year portion of the
maintenance period beyond
redesignation. EPA is proposing to
approve the plan because it meets all
applicable requirements under CAA
sections 110 and 175A.
As a general matter, the Catawba Area
LMP relies on the same control
measures and relevant contingency
provisions to maintain the 1997 8-hour
ozone NAAQS during the second 10year portion of the maintenance period
as the maintenance plan submitted by
DHEC for the first 10-year period.
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II. Background
Ground-level ozone is formed when
oxides of nitrogen (NOX) and volatile
organic compounds (VOC) react in the
presence of sunlight. These two
pollutants, referred to as ozone
precursors, are emitted by many types of
pollution sources, including on- and offroad motor vehicles and engines, power
plants and industrial facilities, and
smaller area sources such as lawn and
garden equipment and paints. Scientific
evidence indicates that adverse public
health effects occur following exposure
to ozone, particularly in children and in
adults with lung disease. Breathing air
containing ozone can reduce lung
function and inflame airways, which
can increase respiratory symptoms and
1 EPA received the SIP submission on July 10,
2020.
2 See 77 FR 13493 (March 7, 2012).
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aggravate asthma and other lung
diseases.
Ozone exposure also has been
associated with increased susceptibility
to respiratory infections, medication
use, doctor visits, and emergency
department visits and hospital
admissions for individuals with lung
disease. Children are at increased risk
from exposure to ozone because their
lungs are still developing and they are
more likely to be active outdoors, which
increases their exposure.3
In 1979, under section 109 of the
CAA, EPA established primary and
secondary NAAQS for ozone at 0.12
parts per million (ppm), averaged over
a 1-hour period. See 44 FR 8202
(February 8, 1979). On July 18, 1997,
EPA revised the primary and secondary
NAAQS for ozone to set the acceptable
level of ozone in the ambient air at 0.08
ppm, averaged over an 8-hour period.
See 62 FR 38856 (July 18, 1997).4 EPA
set the 8-hour ozone NAAQS based on
scientific evidence demonstrating that
ozone causes adverse health effects at
lower concentrations and over longer
periods of time than was understood
when the pre-existing 1-hour ozone
NAAQS was set. EPA determined that
the 8-hour ozone NAAQS would be
more protective of human health,
especially children and adults who are
active outdoors, and individuals with a
pre-existing respiratory disease, such as
asthma.
Following promulgation of a new or
revised NAAQS, EPA is required by the
CAA to designate areas throughout the
nation as attaining or not attaining the
NAAQS. On April 15, 2004, EPA
designated the Charlotte NC-SC 1997 8hour NAAQS Area which consists of
Cabarrus, Gaston, Lincoln,
Mecklenburg, Rowan, Union and a
portion of Iredell County (i.e., Davidson
and Coddle Creek Townships) in North
Carolina and a portion of York County,
South Carolina, including the Catawba
Area, as nonattainment for the 1997 8hour ozone NAAQS. The designation
became effective on June 15, 2004. See
69 FR 23858 (April 30, 2004).
Similarly, on May 21, 2012, EPA
designated areas as unclassifiable/
attainment or nonattainment for the
3 See ‘‘Fact Sheet, Proposal to Revise the National
Ambient Air Quality Standards for Ozone,’’ January
6, 2010, and 75 FR 2938 (January 19, 2010).
4 In March 2008, EPA completed another review
of the primary and secondary ozone NAAQS and
tightened them further by lowering the level for
both to 0.075 ppm. See 73 FR 16436 (March 27,
2008). Additionally, in October 2015, EPA
completed a review of the primary and secondary
ozone NAAQS and tightened them by lowering the
level for both to 0.070 ppm. See 80 FR 65292
(October 26, 2015).
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67403
2008 8-hour ozone NAAQS.5 The
Catawba Area was designated
unclassifiable/attainment although the
surrounding Charlotte—Gastonia-Rock
Hill NC-SC Area 6 (hereinafter referred
to as the Charlotte NC-SC 2008 NAAQS
Area) was designated as nonattainment
for the 2008 8-hour ozone NAAQS and
classified as a marginal nonattainment
area. This designation became effective
on July 20, 2012.7 In summary, the
Catawba Area was included in the
Charlotte NC-SC 1997 8-hour NAAQS
boundary designation in 2004 but was
not included in the Charlotte NC-SC
2008 NAAQS boundary designation in
2012.
In addition, on November 16, 2017,
areas were designated for the 2015 8hour ozone NAAQS. The entire states of
North Carolina and South Carolina—
including the Catawba Indian Nation—
were designated attainment/
unclassifiable for the 2015 8-hour ozone
NAAQS, with an effective date on
January 16, 2018.8
A state may submit a request to
redesignate a nonattainment area that is
attaining a NAAQS to attainment, and,
if the area has met other required
criteria described in section 107(d)(3)(E)
of the CAA, EPA may approve the
redesignation request.9 One of the
criteria for redesignation is to have an
approved maintenance plan under CAA
section 175A. The maintenance plan
must demonstrate that the area will
continue to maintain the NAAQS for the
period extending ten years after
redesignation, and it must contain such
additional measures as necessary to
5 In 2011, EPA established the ‘‘Guidance to
Regions for Working with Tribes during the
National Ambient Air Quality Standards (NAAQS)
Designations Process’’ memorandum providing
guidance to EPA Regional Offices for working with
federally-recognized Indian tribes regarding the
CAA section 107(d) NAAQS boundary designations
process for Indian country. See https://
www.epa.gov/sites/production/files/2017-02/
documents/12-20-11_guidance_to_regions_for_
working_with_tribes_naaqs_designations.pdf. This
guidance was then applied to the 2012 designation
process for the 2008 ozone NAAQS.
6 The Charlotte—Gastonia-Rock Hill NC-SC Area
for the 2008 8-hour ozone NAAQS consists of
portions of Cabarrus, Gaston, Iredell, Lincoln,
Rowan and Union Counties and the entirety of
Mecklenburg County in North Carolina, and a
portion of York County, South Carolina which
excludes the Catawba Area.
7 See 77 FR 30088.
8 See 82 FR 54232.
9 Section 107(d)(3)(E) of the CAA sets out the
requirements for redesignating a nonattainment area
to attainment. They include attainment of the
NAAQS, full approval of the applicable SIP
pursuant to CAA section 110(k), determination that
improvement in air quality is a result of permanent
and enforceable reductions in emissions,
demonstration that the state has met all applicable
section 110 and part D requirements, and a fully
approved maintenance plan under CAA section
175A.
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ensure maintenance and such
contingency provisions as necessary to
assure that violations of the NAAQS
will be promptly corrected. Eight years
after the effective date of redesignation,
the state must also submit a second
maintenance plan to ensure ongoing
maintenance of the NAAQS for an
additional ten years pursuant to CAA
section 175A(b) (i.e., ensuring
maintenance for 20 years after
redesignation).
EPA has published long-standing
guidance for states on developing
maintenance plans.10 The Calcagni
memo provides that states may
generally demonstrate maintenance by
either performing air quality modeling
to show that the future mix of sources
and emission rates will not cause a
violation of the NAAQS or by showing
that projected future emissions of a
pollutant and its precursors will not
exceed the level of emissions during a
year when the area was attaining the
NAAQS (i.e., attainment year
inventory). See Calcagni memo at page
9. EPA clarified in three subsequent
guidance memos that certain areas
could meet the CAA section 175A
requirement to provide for maintenance
by showing that the area was unlikely
to violate the NAAQS in the future,
using information such as the area’s
design value 11 being significantly below
the standard and the area having a
historically stable design value.12 EPA
refers to a maintenance plan containing
this streamlined demonstration as an
LMP.
EPA has interpreted CAA section
175A as permitting the LMP option
because section 175A of the Act does
not define how areas may demonstrate
maintenance, and in EPA’s experience
implementing the various NAAQS,
areas that qualify for an LMP and have
approved LMPs have rarely, if ever,
experienced subsequent violations of
the NAAQS. As noted in the LMP
guidance memoranda, states seeking an
10 John Calcagni, Director, Air Quality
Management Division, EPA Office of Air Quality
Planning and Standards (OAQPS), ‘‘Procedures for
Processing Requests to Redesignate Areas to
Attainment,’’ September 4, 1992 (Calcagni memo).
11 The ozone design value for a monitoring site is
the 3-year average of the annual fourth-highest daily
maximum 8-hour average ozone concentrations.
The design value for an ozone area is the highest
design value of any monitoring site in the area.
12 See ‘‘Limited Maintenance Plan Option for
Nonclassifiable Ozone Nonattainment Areas’’ from
Sally L. Shaver, OAQPS, dated November 16, 1994;
‘‘Limited Maintenance Plan Option for
Nonclassifiable CO Nonattainment Areas’’ from
Joseph Paisie, OAQPS, dated October 6, 1995; and
‘‘Limited Maintenance Plan Option for Moderate
PM10 Nonattainment Areas’’ from Lydia Wegman,
OAQPS, dated August 9, 2001. Copies of these
guidance memoranda can be found in the docket for
this proposed rulemaking.
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LMP must still submit the other
maintenance plan elements outlined in
the Calcagni memo, including: An
attainment emissions inventory,
provisions for the continued operation
of the ambient air quality monitoring
network, verification of continued
attainment, and a contingency plan in
the event of a future violation of the
NAAQS. Moreover, a state seeking an
LMP must still submit its section 175A
maintenance plan as a revision to its
SIP, with all attendant notice and
comment procedures. While the LMP
guidance memoranda were originally
written with respect to certain
NAAQS,13 EPA has extended the LMP
interpretation of section 175A to other
NAAQS and pollutants not specifically
covered by the previous guidance
memos.14
In this case, EPA is proposing to
approve the Catawba Area LMP because
the State has made a showing,
consistent with EPA’s prior LMP
guidance, that the Charlotte NC-SC 1997
8-hour NAAQS Area’s ozone
concentrations are well below the 1997
8-hour ozone NAAQS and have been
historically stable, and that it has met
the other maintenance plan
requirements. DHEC submitted this
LMP for the Catawba Area to fulfill the
second maintenance plan requirement
in the Act. EPA’s evaluation of the
Catawba Area LMP is presented below.
In June of 2011, DHEC submitted to
EPA a request to redesignate the York
County, South Carolina portion of the
Charlotte NC-SC 1997 8-hour NAAQS
Area (which includes the Catawba
Area), to attainment for the 1997 8-hour
ozone NAAQS. This submittal included
a plan to provide for maintenance of the
1997 8-hour ozone NAAQS in the
Charlotte NC-SC 1997 8-hour NAAQS
Area through 2022 as a revision to the
South Carolina SIP. EPA approved
South Carolina’s Charlotte NC-SC 1997
8-hour NAAQS Area Maintenance Plan
and the State’s request to redesignate
the South Carolina portion of the
Charlotte NC-SC 1997 NAAQS Area to
attainment for the 1997 8-hour ozone
NAAQS effective December 26, 2012.15
Under CAA section 175A(b), states
must submit a revision to the first
maintenance plan eight years after
redesignation to provide for
13 The prior memos addressed: Unclassifiable
areas under the 1-hour ozone NAAQS,
nonattainment areas for the PM10 (particulate matter
with an aerodynamic diameter less than 10
microns) NAAQS, and nonattainment areas for the
carbon monoxide (CO) NAAQS.
14 See, e.g., 79 FR 41900 (July 18, 2014) (Approval
of the second ten-year LMP for the Grant County
1971 SO2 maintenance area).
15 See 77 FR 75862 (December 26, 2012).
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maintenance of the NAAQS for ten
additional years following the end of the
first 10-year period. EPA’s final
implementation rule for the 2008 8-hour
ozone NAAQS revoked the 1997 8-hour
ozone NAAQS and stated that one
consequence of revocation was that
areas that had been redesignated to
attainment (i.e., maintenance areas) for
the 1997 NAAQS no longer needed to
submit second 10-year maintenance
plans under CAA section 175A(b).16 On
December 11, 2015, EPA redesignated
the South Carolina portion of the
Charlotte NC-SC 2008 NAAQS Area
(which does not include the Catawba
Area) as attainment for the 2008 8-hour
ozone NAAQS, and the designation
became effective on January 11, 2016.
See 80 FR 76865.
In South Coast Air Quality
Management District v. EPA, the United
States Court of Appeals for the District
of Columbia Circuit (D.C. Circuit)
vacated EPA’s interpretation that,
because of the revocation of the 1997 8hour ozone NAAQS, second
maintenance plans were not required for
‘‘orphan maintenance areas,’’ i.e., areas
that had been redesignated to
attainment for the 1997 8-hour ozone
NAAQS (maintenance areas) and were
designated attainment for the 2008
ozone NAAQS. South Coast, 882 F.3d
1138 (D.C. Cir. 2018). Thus, states with
these ‘‘orphan maintenance areas’’
under the 1997 8-hour ozone NAAQS
must submit maintenance plans for the
second maintenance period.
Accordingly, through a letter dated July
7, 2020, South Carolina submitted a
second maintenance plan covering the
Catawba Area that provides for
attainment of the 1997 8-hour ozone
NAAQS through 2032.17
In recognition of the continuing
record of air quality monitoring data
showing ambient 8-hour ozone
concentrations in the Charlotte NC-SC
1997 8-hour NAAQS Area well below
the 1997 8-hour ozone NAAQS, DHEC
chose the LMP option for the
development of its second 1997 8-hour
ozone NAAQS maintenance plan
covering the Catawba Area. On July 7,
2020, DHEC adopted this second 10year 1997 8-hour ozone maintenance
plan, and subsequently submitted the
Catawba Area LMP to EPA as a revision
to the South Carolina SIP.
III. South Carolina’s SIP Submittal
As mentioned above, on July 7, 2020,
DHEC submitted the Catawba Area LMP
16 See
80 FR 12264, 12315 (March 6, 2015).
an email dated October 18, 2021, DHEC
clarified that the end of the maintenance plan
submitted on June 7, 2020, is 2032.
17 In
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to EPA as a revision to the South
Carolina SIP. The submittal includes the
LMP, air quality data, a summary of the
previous emissions inventory and a
conclusion regarding future emission
levels, and attachments, as well as
certification of adoption of the plan by
DHEC. Attachments to the plan include
documentation of notice, opportunity
for hearing and public participation
prior to adoption of the plan by DHEC
on July 7, 2020, and state legal
authority. The LMP notes that South
Carolina’s LMP submittal for the
remainder of the 20-year maintenance
period for the Catawba Area is in
response to the D.C. Circuit’s decision
overturning aspects of EPA’s
Implementation Plan rule. The Catawba
Area LMP does not include any
additional emissions reduction
measures but relies on the same
emissions reduction strategy as the first
10-year Maintenance Plan that provides
for the maintenance of the 1997 8-hour
ozone NAAQS through 2022. Prevention
of significant deterioration (PSD)
requirements and control measures
contained in the SIP will continue to
apply, and federal measures (e.g.,
Federal motor vehicle control program)
will continue to be implemented in the
Catawba Area.
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IV. EPA’s Evaluation of South
Carolina’s SIP Submittal
EPA has reviewed the Catawba Area
LMP which is designed to maintain the
1997 8-hour ozone NAAQS within the
Catawba Area through the end of the 20year period beyond redesignation, as
required under CAA section 175A(b).
As discussed below, the Catawba
Area’s impact on the larger Charlotte
NC-SC 1997 8-hour NAAQS Area is very
limited due to its size, population, and
emissions profile. In addition, the
monitoring values in the Charlotte NCSC 1997 8-hour NAAQS Area, including
the Catawba Area, are well below the
NAAQS. As a result, EPA is proposing
to approve the Catawba Area LMP as
meeting the 175A requirements. The
following is a more detailed summary of
EPA’s interpretation of the section 175A
requirements 18 and EPA’s evaluation of
how each requirement is met.
A. Area Characteristics
The Catawba Indian Nation tribal
lands are comprised of a total of
approximately 1,000 acres, in two
sections along the Catawba River in the
eastern portion of York County, South
Carolina.19 The total Catawba Indian
18 See
Calcagni memo.
described in the July 7, 2020 Submittal, the
Catawba Area consists of two tracts of land along
19 As
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Nation population is 3,370 (2010
Census), however, based on recent
census estimates, the population of the
Reservation is only 1,288 with 517
housing units within the Reservation.20
According to the 2019 census estimates,
the total York County population is
280,979, and the Reservation is home to
0.46 percent of York County’s
population.21 The Reservation is a
residential area which contains no
industry, no limited access highways or
transportation facilities, and only a few
miles of secondary roads. There is a boat
ramp but there are no airports, helipads,
railroad tracks, or associated facilities.
The Reservation has no shopping
centers or industrial sites. The only
community facilities, which are of
modest size, are the Tribal offices and
the Senior Center.
B. Attainment Emissions Inventory
For maintenance plans, a state should
develop a comprehensive, accurate
inventory of actual emissions for an
attainment year to identify the level of
emissions which is sufficient to
maintain the NAAQS. A state should
develop this inventory consistent with
EPA’s most recent guidance on
emissions inventory development. For
ozone, the inventory should be based on
typical summer day emissions of VOC
and NOX, as these pollutants are
precursors to ozone formation.
The 175A maintenance plan approved
by EPA included an attainment
inventory for the South Carolina portion
of the Charlotte NC-SC 1997 8-hour
NAAQS Area that reflects typical
summer day VOC and NOX emissions in
2010.22 As previously mentioned, the
Catawba Area is included in the South
Carolina portion of the Charlotte NC-SC
1997 8-hour NAAQS Area.
Because the Catawba Nation
Reservation is a small residential area,
both geographically and in population,
with no industrial sites, no limited
access highways, no transportation
facilities, and no point sources of ozone
the Catawba River with a total land base of
approximately 1,000 acres, which comprises only
0.002 percent of the land area of York County. See
Technical Support Document for Charlotte-Rock
Hill, NC-SC Area Designations for the 2008 Ozone
National Ambient Air Quality Standards, available
at https://www.regulations.gov/search?filter=EPAHQ-OAR-2008-0476-0642.
20 See Catawba Reservation, U.S. Census Bureau,
2015–2019 American Community Survey 5-Year
Estimates, available at https://www.census.gov/
tribal/?aianihh=0525.
21 Id., see also https://www.census.gov/
quickfacts/yorkcountysouthcarolina (showing York
County, South Carolina with a 2019 estimated
population of 280,979 and a 2020 census
population of 282,090).
22 See 77 FR 68087 (November 15, 2012) and 77
FR 75862 (December 26, 2012).
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precursors, there are no estimates of
VOC and NOX emissions from the
Catawba Area. Given the unique nature
of the Catawba Area and the air quality
analysis in section IV.C, below, EPA
does not believe that a detailed
accounting of attainment level
emissions is necessary in this instance.
C. Maintenance Demonstration
The maintenance demonstration
requirement is considered to be satisfied
in a LMP if the state can provide
sufficient weight of evidence indicating
that air quality in the area is well below
the level of the NAAQS, that past air
quality trends have been shown to be
stable, and that the probability of the
area experiencing a violation over the
second 10-year maintenance period is
low.23 These criteria are evaluated
below with regard to the Catawba Area.
1. Evaluation of Ozone Air Quality
Levels
To attain the 1997 8-hour ozone
NAAQS, the three-year average of the
fourth-highest daily maximum 8-hour
average ozone concentrations (design
value) at each monitor within an area
must not exceed 0.08 ppm. Based on the
rounding convention described in 40
CFR part 50, Appendix I, the NAAQS is
attained if the design value is 0.084 ppm
or below. At the time of submission,
EPA evaluated quality assured and
certified 2016–2018 monitoring data
and determined that the highest design
value for the Charlotte NC-SC 1997 8hour NAAQS Area was 0.070 ppm, or
83 percent of the level of the 1997 8hour ozone NAAQS (measured at the
University Meadows monitor in
Mecklenburg, North Carolina (AQS ID:
37–119–0046)), and the design value for
the Catawba Area monitor (AQS ID: 45–
091–8801) was 0.064 ppm, or 76 percent
of the level of the 1997 8-hour ozone
NAAQS. Based on quality assured and
certified monitoring data for 2018–2020,
the current, highest design value for the
Charlotte NC-SC 1997 8-hour NAAQS
Area is 0.067 ppm, or 80 percent of the
level of the 1997 8-hour ozone NAAQS
(measured at the University Meadows
monitor and the Garinger High School
Monitor in Mecklenburg, NC (AQS ID:
37–119–0041)), and the current design
value for the Catawba Area monitor is
0.062 ppm, or 74 percent of the level of
the 1997 8-hour ozone NAAQS.
Consistent with prior guidance, EPA
believes that if the most recent air
quality design value for the area is at a
level that is well below the NAAQS
(e.g., below 85 percent of the NAAQS,
or in this case below 0.071 ppm), then
23 See
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EPA considers the state to have met the
section 175A requirement for a
demonstration that the area will
maintain the NAAQS for the requisite
period. Such a demonstration assumes
continued applicability of prevention of
significant deterioration requirements
and any control measures already in the
SIP and that Federal measures will
remain in place through the end of the
second 10-year maintenance period,
absent a showing consistent with
section 110(l) that such measures are
not necessary to assure maintenance.
Table 3 presents the design values for
each monitor in the Charlotte NC-SC
1997 8-hour NAAQS Area over the
2008–2020 period. As shown in Table 3,
all sites have been below the level of the
1997 8-hour ozone NAAQS since the
area was redesignated to attainment,
and the most current design value is
below the level of 85 percent of the
NAAQS, consistent with prior LMP
guidance.
TABLE 3—1997 8-HOUR OZONE NAAQS DESIGN VALUES (DV) (PPM) AT MONITORING SITES IN THE CHARLOTTE NC-SC
1997 NAAQS AREA FOR THE 2008–2020 TIME PERIOD
Location
County (state)/tribal land
AQS site
ID
2008–
2010
DV
2009–
2011
DV
2010–
2012
DV
2011–
2013
DV
2012–
2014
DV
2013–
2015
DV
2014–
2016
DV
2015–
2017
DV
2016–
2018
DV
2017–
2019
DV
2018–
2020
DV
Catawba Area Monitor ....
Arrowood .........................
Crouse .............................
Enochville ........................
Garinger High School ......
County Line .....................
University Meadows ........
Rockwell ..........................
Monroe School ................
Catawba Indian Nation ...
Mecklenburg (NC) ...........
Lincoln (NC) ....................
Rowan (NC) ....................
Mecklenburg (NC) ...........
Mecklenburg (NC) ...........
Mecklenburg (NC) ...........
Rowan (NC) ....................
Union (NC) ......................
45–091–8801
37–119–1005
37–109–0004
37–159–0022
37–119–0041
37–117–1009
37–119–0046
37–159–0021
37–179–0003
(*)
0.073
0.072
0.077
0.078
0.082
(****)
0.077
0.072
(*)
0.076
0.071
0.076
0.079
0.078
(****)
0.075
0.070
(*)
0.077
0.075
0.077
0.083
0.083
(****)
0.078
0.073
(*)
0.072
0.072
0.072
0.078
0.078
(****)
0.073
0.070
(*)
0.066
0.068
(***)
0.070
0.073
(****)
0.068
0.068
(*)
(**)
0.065
(***)
0.068
0.067
(****)
0.064
0.065
(*)
(**)
0.067
(***)
0.069
(****)
0.070
0.065
0.068
(*)
(**)
0.067
(***)
0.069
(****)
0.070
0.064
0.067
0.064
(**)
0.065
(***)
0.068
(****)
0.070
0.062
0.068
0.064
(**)
0.064
(***)
0.070
(****)
0.069
0.062
0.068
0.062
(**)
0.060
(***)
0.067
(****)
0.067
0.061
0.063
* The ozone monitor in the Catawba Indian Nation (AQS Site ID 45–091–8801) began operation for the 2016 ozone season.
** The Arrowood monitor in Mecklenburg County (AQS Site ID 37–119–1005) was shut down in 2014.
*** The Enochville School monitor in Rowan County (AQS Site ID 37–159–0022) was shut down in 2013.
**** In 2014, the ozone monitor at Mecklenburg County Line (AQS Site ID 37–117–1009) changed locations to University Meadows (AQS ID 37–119–0046).
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Therefore, the Catawba Area is
eligible for the LMP option, and EPA
proposes to find that the long record of
monitored ozone concentrations that
attain the NAAQS, together with the
continuation of existing VOC and NOX
emissions control programs in the
Charlotte NC-SC 1997 8-hour NAAQS
Area, adequately provide for the
maintenance of the 1997 8-hour ozone
NAAQS in the Catawba Area through
the second 10-year maintenance period
and beyond.
Additional supporting information
that the Area is expected to continue to
maintain the NAAQS can be found in
projections of future year design values
that EPA recently completed for the
Revised Cross-State Air Pollution Rule
Update for the 2008 Ozone NAAQS that
EPA finalized on April 30, 2021.24
Those projections, made for the year
2023, show that the maximum design
value for the Charlotte NC-SC 1997
Ozone Area is expected to be 60.3 ppb
and the maximum design value of the
Catawba Area monitor is expected to be
53.3 ppb. EPA is not proposing to make
any finding in this action regarding
24 On April 30, 2021, EPA published the final
Revised Cross-State Air Pollution Rule (CSAPR)
Update (RCU) using updated modeling that focused
on analytic years 2023 and 2028 and an
‘‘interpolation’’ analysis of these modeling results
to generate air quality and contribution values for
the 2021 analytic year. See 86 FR 23054. https://
www.govinfo.gov/content/pkg/FR-2021-04-30/pdf/
2021-05705.pdf. This modeling included projected
ozone design values for ozone monitors in the
Catawba Area and Charlotte SC-NC maintenance
areas.
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interstate transport obligations for any
state.
2. Stability of Ozone Levels
As discussed above, the Charlotte NCSC 1997 8-hour NAAQS Area has
maintained air quality below the 1997 8hour ozone NAAQS over the past eleven
design values. Additionally, the design
value data shown in Table 3 illustrates
that ozone levels have been relatively
stable over this timeframe, with a
modest downward trend. For example,
the data in Table 3 indicates that the
largest, year over year change in design
value at any one monitor during these
eleven years was 0.008 ppm which
occurred between the 2013 design value
and the 2014 design value, representing
approximately a 10 percent decrease at
monitor 37–119–0041 (Garinger High
School). Furthermore, there is an overall
downward trend in design values for the
Charlotte NC-SC 1997 8-hour NAAQS
Area. See, e.g., Table 1, above, data for
monitor 37–159–0021 (Rockwell)0.016
ppm, or 20.8 percent). This downward
trend in ozone levels, coupled with the
relatively small, year-over-year variation
in ozone design values, makes it
reasonable to conclude that the Catawba
Area will not exceed the 1997 8-hour
ozone NAAQS during the second 10year maintenance period.
D. Monitoring Network and Verification
of Continued Attainment
EPA periodically reviews the ozone
monitoring networks operated and
maintained by the states in accordance
with 40 CFR part 58. The network plans,
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which are submitted annually to EPA,
are consistent with the ambient air
quality monitoring network assessment.
It is important to note that the Charlotte
NC-SC 1997 8-hour NAAQS Area was
designated nonattainment due to
violating monitors in the North Carolina
portion of that area and that South
Carolina has never operated any part 58
monitors in the Charlotte NC-SC 1997 8hour NAAQS Area.25 26 North Carolina
operates a network plan with multiple
monitors within the boundary of the
Charlotte NC-SC 1997 8-hour NAAQS
Area. The annual network plan
developed by North Carolina follows a
public notification and review process.
EPA has reviewed and approved the
North Carolina’s 2020 Ambient Air
Monitoring Network Plan (‘‘2020
Annual Network Plan’’) which
addresses the relevant monitors used to
determine attainment for the Charlotte
NC-SC 1997 8-hour NAAQS Area.27
25 See 69 FR 23858 (April 30, 2004) for the final
designation action for the 1997 8-hour ozone
NAAQS and https://www.epa.gov/ground-levelozone-pollution/1997-ozone-national-ambient-airquality-standards-naaqs-nonattainment for the
monitoring data associated with the designation for
the 1997 8-hour ozone NAAQS.
26 South Carolina maintains one monitor in York
County. Although that monitor is near the
maintenance boundary, it is not used to determine
compliance of the Charlotte NC-SC 1997 8-hour
NAAQS Area with the 1997 8-hour ozone NAAQS
because it is not located within the maintenance
area.
27 See October 30, 2020, letter and approval from
Caroline Freeman, Director, Air and Radiation
Division, EPA Region 4 to Mike Abraczinskas,
Director, Division of Air Quality, North Carolina
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Separately, North Carolina has
committed to maintain the monitoring
network that is used to monitor ozone
for compliance with the 1997 8-hour
ozone NAAQS, which includes the
monitors within the North Carolina
portion of the Charlotte NC-SC 1997 8hour NAAQS Area.28
Subsequent to the nonattainment
designation for the 1997 8-hour ozone
NAAQS, the Catawba Indian Nation,
under a CAA section 103 grant
agreement with EPA, erected and
operates a monitor in the Catawba Area.
EPA provides oversight of the Catawba
Indian Nation’s operation of this
monitor through normal grant
monitoring activities on annual basis.
To verify the attainment status of the
Area over the maintenance period, the
maintenance plan should contain
provisions for continued operation of an
appropriate, EPA-approved monitoring
network in accordance with 40 CFR part
58. As noted above, North Carolina’s
2020 Annual Network Plan, which
covers the monitors within the Charlotte
NC-SC 1997 8-hour NAAQS Area, has
been approved by EPA in accordance
with 40 CFR part 58, and North Carolina
has committed to continue to maintain
a network in accordance with EPA
requirements. Although South Carolina
does not operate any part 58 monitors
in the Charlotte NC-SC 1997 8-hour
NAAQS Area, the State commits to
continue operating an approved ozone
monitoring network near the South
Carolina portion of that area; commits to
consult with the EPA prior to making
changes to the existing monitoring
network should changes become
necessary in the future; and
acknowledges the obligation to meet
monitoring requirements in compliance
with 40 CFR part 58.29 EPA proposes to
find that there is an adequate ambient
air quality monitoring network in the
Charlotte NC-SC 1997 8-hour NAAQS
Area to verify continued attainment of
the 1997 8-hour ozone NAAQS.
E. Contingency Plan
Section 175A(d) of the CAA requires
that a maintenance plan include
contingency provisions. The purpose of
such contingency provisions is to
prevent future violations of the NAAQS
or to promptly remedy any NAAQS
violations that might occur during the
maintenance period. These contingency
measures are required to be
implemented expeditiously once they
Department of Environmental Quality, available in
the docket for this proposed action.
28 See 78 FR 72036 (December 2, 2013), 78 FR
45152 (July 26, 2013).
29 See South Carolina’s July 7, 2020, SIP submittal
at page 7.
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are triggered by a future violation of the
NAAQS or some other trigger. The state
should identify specific triggers which
will be used to determine when the
contingency measures need to be
implemented.
The trigger identified in the Catawba
Area LMP is a Quality Assured/Quality
Controlled (QA/QC) violating design
value of the 1997
8-hour ozone NAAQS within or near the
Charlotte NC-SC 1997 8-hour NAAQS
Area.30 If this trigger is activated, the
maintenance plan requires South
Carolina to conduct analyses to
determine the emission control
measures that will be necessary for
attaining or maintaining the 1997 8-hour
ozone NAAQS. The maintenance plan
outlines the steps that South Carolina
must conduct to determine control
measures, including verification and
analysis of data related to the
exceedance, and possible causes. South
Carolina will adopt and implement
appropriate contingency measures
tailored to the specific circumstances of
the violation (or increased
concentrations) within 24 months after
a triggering event.31 32
EPA proposes to find that the
contingency provisions in South
Carolina’s second maintenance plan for
the 1997 8-hour ozone NAAQS meet the
requirements of the CAA section
175A(d).
F. Conclusion
EPA proposes to find that the Catawba
Area LMP for the 1997 8-hour ozone
30 If QA/QC data indicates a violating design
value for the 8-hour ozone NAAQS, then the
triggering event will be the date of the design value
violation, and not the final QA/QC date. However,
if initial monitoring data indicates a possible design
value violation but later QA/QC indicates that a
NAAQS violation did not occur, then a triggering
event will not have occurred, and contingency
measures will not need to be implemented.
31 As stated above, the Catawba Area LMP
contains the same contingency measures that were
included in the first 10-year maintenance plan, as
tailored to the Catawba Area. For example, some
contingency measures included only in the first 10year LMP would have limited emissions reductions
or were not applicable based on the characteristics
of the Catawba Area (for example, alternative fuel
programs for fleet vehicle operations, as there are
no vehicle fleets in the Catawba Area). In addition,
South Carolina added a provision to work closely
with the York County Air Coalition for outreach
and stakeholder input, contingency measure
support, and community emission reduction efforts,
which is a logical extension in recognition that this
LMP is for a subset of the larger South Carolina
portion of the Charlotte NC-SC 1997 8-hour NAAQS
Area.
32 See the Contingency Plan section of the
Catawba Area LMP for further information
regarding the contingency plan, including measures
that South Carolina will consider for adoption if the
trigger is activated, as well as additional steps and
notification to EPA if DHEC determines additional
time than 24 months is necessary to implement
specific contingency measures.
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NAAQS includes an approvable update
of various elements of the initial EPAapproved Maintenance Plan for the 1997
8-hour ozone NAAQS. EPA also
proposes to find that the Catawba Area
qualifies for the LMP option and
adequately demonstrates maintenance
of the 1997 8-hour ozone NAAQS
through the documentation of
monitoring data showing maximum
1997 8-hour ozone levels below the
NAAQS and historically stable design
values. EPA believes the Catawba Area
LMP, which retains existing control
measures in the SIP, is sufficient to
provide for maintenance of the 1997 8hour ozone NAAQS in the Catawba
Area over the second maintenance
period (i.e., through 2032) and thereby
satisfies the requirements for such a
plan under CAA section 175A(b). EPA
is therefore proposing to approve South
Carolina’s July 7, 2020, submission of
the Catawba Area LMP as a revision to
the South Carolina SIP.
V. Transportation Conformity and
General Conformity
Transportation conformity is required
by section 176(c) of the CAA.
Conformity to a SIP means that
transportation activities will not
produce new air quality violations,
worsen existing violations, or delay
timely attainment of the NAAQS. See
CAA 176(c)(1)(A) and (B). EPA’s
transportation conformity rule at 40 CFR
part 93 subpart A requires that
transportation plans, programs, and
projects conform to SIPs and establishes
the criteria and procedures for
determining whether they conform. The
conformity rule generally requires a
demonstration that emissions from the
Regional Transportation Plan (RTP) and
the Transportation Improvement
Program (TIP) are consistent with the
motor vehicles emissions budget
(MVEB) contained in the control
strategy SIP revision or maintenance
plan. See 40 CFR 93.101, 93.118, and
93.124. A MVEB is defined as ‘‘the
portion of the total allowable emissions
defined in the submitted or approved
control strategy implementation plan
revision or maintenance plan for a
certain date for the purpose of meeting
reasonable further progress milestones
or demonstrating attainment or
maintenance of the NAAQS, for any
criteria pollutant or its precursors,
allocated to highway and transit vehicle
use and emissions.’’ See 40 CFR 93.101.
Under the conformity rule, LMP areas
may demonstrate conformity without a
regional emissions analysis. See 40 CFR
93.109(e). On October 9, 2012, EPA
made a finding that the MVEBs for the
first 10 years of the 1997 8-hour ozone
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maintenance plan for the South Carolina
portion of the Charlotte NC-SC 1997
8-hour NAAQS Area were adequate for
transportation conformity purposes. In a
Federal Register notice dated
September 24, 2012, EPA notified the
public of that finding. See 77 FR 58829.
This adequacy determination became
effective on October 9, 2012. After
approval of this LMP or an adequacy
finding for this LMP, there is no
requirement to meet the budget test
pursuant to the transportation
conformity rule for the Catawba Area.
All actions that would require a
transportation conformity determination
for the Catawba Area under EPA’s
transportation conformity rule
provisions are considered to have
already satisfied the regional emissions
analysis and ‘‘budget test’’ requirements
in 40 CFR 93.118 as a result of EPA’s
adequacy finding for this LMP. See 69
FR 40004 (July 1, 2004).
However, because LMP areas are still
maintenance areas, certain aspects of
transportation conformity
determinations still will be required for
transportation plans, programs, and
projects. Specifically, for such
determinations, RTPs, TIPs, and
transportation projects still will have to
demonstrate that they are fiscally
constrained (40 CFR 93.108) and meet
the criteria for consultation (40 CFR
93.105) and Transportation Control
Measure implementation in the
conformity rule provisions (40 CFR
93.113) as well as meet the hot-spot
requirements for projects (40 CFR
93.116).33 Additionally, conformity
determinations for RTPs and TIPs must
be determined no less frequently than
every four years, and conformity of plan
and TIP amendments and transportation
projects is demonstrated in accordance
with the timing requirements specified
in 40 CFR 93.104. In addition, in order
for projects to be approved they must
come from a currently conforming RTP
and TIP. See 40 CFR 93.114 and 40 CFR
93.115. The Charlotte NC-SC 2008
NAAQS Area must continue to meet all
of the applicable requirements of the
general conformity regulations.
VI. Proposed Action
Under sections 110(k) and 175A of the
CAA and for the reasons set forth above,
EPA is proposing to approve the
Catawba Area LMP for the 1997 8-hour
ozone NAAQS, submitted by DHEC on
July 7, 2020, as a revision to the South
Carolina SIP. EPA is proposing to
33 A conformity determination that meets other
applicable criteria in Table 1 of paragraph (b) of this
section (93.109(e)) is still required, including the
hot-spot requirements for projects in CO, PM10, and
fine particulate matter (PM2.5) areas.
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approve the Catawba Area LMP because
it includes an acceptable update of
various elements of the 1997 8-hour
ozone NAAQS Maintenance Plan
approved by EPA for the first 10-year
period and retains the relevant
provisions of the SIP.
EPA also finds that the Catawba Area
qualifies for the LMP option and that
therefore the Catawba Area LMP
adequately demonstrates maintenance
of the 1997 8-hour ozone NAAQS
through documentation of monitoring
data showing maximum 1997 8-hour
ozone levels well below the NAAQS
and continuation of existing control
measures. EPA believes the Catawba
Area’s 1997 8-Hour Ozone LMP to be
sufficient to provide for maintenance of
the 1997 8-hour ozone NAAQS in the
Catawba Area over the second 10-year
maintenance period, through 2032, and
thereby satisfy the requirements for
such a plan under CAA section 175A(b).
VII. 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. This proposed action merely
proposes to approve state law as
meeting Federal requirements and does
not impose additional requirements
beyond those imposed by state law. For
that reason, this proposed action:
• Is not a significant regulatory action
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);
• Does not impose an information
collection burden under the provisions
of the Paperwork Reduction Act (44
U.S.C. 3501 et seq.);
• Is 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.);
• Does 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);
• Does not have Federalism
implications as specified in Executive
Order 13132 (64 FR 43255, August 10,
1999);
• Is not an economically significant
regulatory action based on health or
safety risks subject to Executive Order
13045 (62 FR 19885, April 23, 1997);
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• Is not a significant regulatory action
subject to Executive Order 13211 (66 FR
28355, May 22, 2001);
• Is 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
• Does 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).
Because this Catawba Area LMP
merely proposes to approve state law as
meeting Federal requirements and does
not impose additional requirements
beyond those imposed by state law, this
Catawba Area LMP for the State of
South Carolina does not have Tribal
implications as specified by Executive
Order 13175 (65 FR 67249, November 9,
2000). Therefore, this action will not
impose substantial direct costs on Tribal
governments or preempt Tribal law. The
Catawba Indian Nation (CIN)
Reservation is located within the
boundary of York County, South
Carolina. Pursuant to the Catawba
Indian Claims Settlement Act, S.C. Code
Ann. 27–16–120 (Settlement Act), ‘‘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.’’ The CIN
also retains authority to impose
regulations applying higher
environmental standards to the
Reservation than those imposed by state
law or local governing bodies, in
accordance with the Settlement Act.
List of Subjects in 40 CFR Part 52
Environmental protection, Air
pollution control, Incorporation by
reference, Intergovernmental Relations,
Nitrogen oxides, Ozone, Reporting and
recordkeeping requirements, Volatile
Organic Compounds.
Authority: 42 U.S.C. 7401 et seq.
Dated: November 17, 2021.
John Blevins,
Acting Regional Administrator,Region 4.
[FR Doc. 2021–25527 Filed 11–24–21; 8:45 am]
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]]>Agencies
[Federal Register Volume 86, Number 225 (Friday, November 26, 2021)]
[Proposed Rules]
[Pages 67402-67408]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-25527]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 52
[EPA-R04-OAR-2020-0677; FRL-9276-01-R4]
Air Plan Approval; South Carolina; Catawba Indian Nation Portion
of the Charlotte-Gastonia-Rock Hill Area Limited Maintenance Plan for
the 1997 8-Hour Ozone NAAQS
AGENCY: Environmental Protection Agency (EPA).
ACTION: Proposed rule.
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SUMMARY: The Environmental Protection Agency (EPA) is proposing to
approve a state implementation plan (SIP) revision submitted by the
State of South Carolina, through the Department of Health and
Environmental Control (DHEC), via a letter dated July 7, 2020. The SIP
revision includes the 1997 8-hour ozone national ambient air quality
standards (NAAQS) Limited Maintenance Plan (LMP) for the Catawba Indian
Nation portion (hereinafter referred to as the Catawba Area) of the
Charlotte-Gastonia-Rock Hill NC-SC 1997 8-hour ozone maintenance area
(hereinafter referred to as the Charlotte NC-SC 1997 8-hour NAAQS
Area). The Charlotte NC-SC 1997 8-hour NAAQS Area is comprised of
Cabarrus, Gaston, Lincoln, Mecklenburg, Rowan, Union and a portion of
Iredell County (i.e., Davidson and Coddle Creek Townships) in North
Carolina and a portion of York County, South Carolina which includes
the Catawba Area. EPA is proposing to approve the Catawba Area LMP
because it provides for the maintenance of the 1997 8-hour ozone NAAQS
within the Catawba Area through the end of the second 10-year portion
of the maintenance period. The effect of this action would be to make
certain commitments related to maintenance of the 1997 8-hour ozone
NAAQS in the Catawba Area federally enforceable as part of the South
Carolina SIP.
DATES: Written comments must be received at the address below on or
before December 27, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R04-
OAR-2020-0677 at https://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 https://www2.epa.gov/dockets/commenting-epa-dockets.
FOR FURTHER INFORMATION CONTACT: Jane Spann, Air Regulatory Management
Section, Air Planning and Implementation Branch, Air and Radiation
Division, U.S. Environmental Protection Agency, Region 4, 61 Forsyth
Street SW, Atlanta, Georgia 30303-8960. The telephone number is (404)
562-9029. Ms. Spann can also be reached via electronic mail at
[email protected].
SUPPLEMENTARY INFORMATION:
Table of Contents
I. Summary of EPA's Proposed Action
II. Background
III. South Carolina's SIP Submittal
IV. EPA's Evaluation of South Carolina's SIP Submittal
A. Area Characteristics
B. Attainment Emissions Inventory
C. Maintenance Demonstration
D. Monitoring Network and Verification of Continued Attainment
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E. Contingency Plan
F. Conclusion
V. Transportation Conformity and General Conformity
VI. Proposed Action
VII. Statutory and Executive Order Reviews
I. Summary of EPA's Proposed Action
In accordance with the Clean Air Act (CAA or Act), EPA is proposing
to approve the Catawba Area LMP for the 1997 8-hour ozone NAAQS,
adopted by DHEC on July 7, 2020, and submitted by DHEC as a revision to
the South Carolina SIP under a letter dated July 7, 2020.\1\ In 2004,
the Charlotte NC-SC 1997 8-hour NAAQS Area, which includes the Catawba
Area, was designated as nonattainment for the 1997 8-hour ozone NAAQS.
Subsequently, in 2012, after a clean data determination \2\ and EPA's
approval of a maintenance plan, the South Carolina portion of the
Charlotte NC-SC 1997 8-hour NAAQS Area, which includes the Catawba
Area, was redesignated to attainment for the 1997 8-hour ozone NAAQS.
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\1\ EPA received the SIP submission on July 10, 2020.
\2\ See 77 FR 13493 (March 7, 2012).
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The Catawba Area LMP is designed to maintain the 1997 8-hour ozone
NAAQS within the Catawba Area through the end of the second 10-year
portion of the maintenance period beyond redesignation. EPA is
proposing to approve the plan because it meets all applicable
requirements under CAA sections 110 and 175A.
As a general matter, the Catawba Area LMP relies on the same
control measures and relevant contingency provisions to maintain the
1997 8-hour ozone NAAQS during the second 10-year portion of the
maintenance period as the maintenance plan submitted by DHEC for the
first 10-year period.
II. Background
Ground-level ozone is formed when oxides of nitrogen
(NOX) and volatile organic compounds (VOC) react in the
presence of sunlight. These two pollutants, referred to as ozone
precursors, are emitted by many types of pollution sources, including
on- and off-road motor vehicles and engines, power plants and
industrial facilities, and smaller area sources such as lawn and garden
equipment and paints. Scientific evidence indicates that adverse public
health effects occur following exposure to ozone, particularly in
children and in adults with lung disease. Breathing air containing
ozone can reduce lung function and inflame airways, which can increase
respiratory symptoms and aggravate asthma and other lung diseases.
Ozone exposure also has been associated with increased
susceptibility to respiratory infections, medication use, doctor
visits, and emergency department visits and hospital admissions for
individuals with lung disease. Children are at increased risk from
exposure to ozone because their lungs are still developing and they are
more likely to be active outdoors, which increases their exposure.\3\
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\3\ See ``Fact Sheet, Proposal to Revise the National Ambient
Air Quality Standards for Ozone,'' January 6, 2010, and 75 FR 2938
(January 19, 2010).
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In 1979, under section 109 of the CAA, EPA established primary and
secondary NAAQS for ozone at 0.12 parts per million (ppm), averaged
over a 1-hour period. See 44 FR 8202 (February 8, 1979). On July 18,
1997, EPA revised the primary and secondary NAAQS for ozone to set the
acceptable level of ozone in the ambient air at 0.08 ppm, averaged over
an 8-hour period. See 62 FR 38856 (July 18, 1997).\4\ EPA set the 8-
hour ozone NAAQS based on scientific evidence demonstrating that ozone
causes adverse health effects at lower concentrations and over longer
periods of time than was understood when the pre-existing 1-hour ozone
NAAQS was set. EPA determined that the 8-hour ozone NAAQS would be more
protective of human health, especially children and adults who are
active outdoors, and individuals with a pre-existing respiratory
disease, such as asthma.
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\4\ In March 2008, EPA completed another review of the primary
and secondary ozone NAAQS and tightened them further by lowering the
level for both to 0.075 ppm. See 73 FR 16436 (March 27, 2008).
Additionally, in October 2015, EPA completed a review of the primary
and secondary ozone NAAQS and tightened them by lowering the level
for both to 0.070 ppm. See 80 FR 65292 (October 26, 2015).
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Following promulgation of a new or revised NAAQS, EPA is required
by the CAA to designate areas throughout the nation as attaining or not
attaining the NAAQS. On April 15, 2004, EPA designated the Charlotte
NC-SC 1997 8-hour NAAQS Area which consists of Cabarrus, Gaston,
Lincoln, Mecklenburg, Rowan, Union and a portion of Iredell County
(i.e., Davidson and Coddle Creek Townships) in North Carolina and a
portion of York County, South Carolina, including the Catawba Area, as
nonattainment for the 1997 8-hour ozone NAAQS. The designation became
effective on June 15, 2004. See 69 FR 23858 (April 30, 2004).
Similarly, on May 21, 2012, EPA designated areas as unclassifiable/
attainment or nonattainment for the 2008 8-hour ozone NAAQS.\5\ The
Catawba Area was designated unclassifiable/attainment although the
surrounding Charlotte--Gastonia-Rock Hill NC-SC Area \6\ (hereinafter
referred to as the Charlotte NC-SC 2008 NAAQS Area) was designated as
nonattainment for the 2008 8-hour ozone NAAQS and classified as a
marginal nonattainment area. This designation became effective on July
20, 2012.\7\ In summary, the Catawba Area was included in the Charlotte
NC-SC 1997 8-hour NAAQS boundary designation in 2004 but was not
included in the Charlotte NC-SC 2008 NAAQS boundary designation in
2012.
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\5\ In 2011, EPA established the ``Guidance to Regions for
Working with Tribes during the National Ambient Air Quality
Standards (NAAQS) Designations Process'' memorandum providing
guidance to EPA Regional Offices for working with federally-
recognized Indian tribes regarding the CAA section 107(d) NAAQS
boundary designations process for Indian country. See https://www.epa.gov/sites/production/files/2017-02/documents/12-20-11_guidance_to_regions_for_working_with_tribes_naaqs_designations.pdf
. This guidance was then applied to the 2012 designation process for
the 2008 ozone NAAQS.
\6\ The Charlotte--Gastonia-Rock Hill NC-SC Area for the 2008 8-
hour ozone NAAQS consists of portions of Cabarrus, Gaston, Iredell,
Lincoln, Rowan and Union Counties and the entirety of Mecklenburg
County in North Carolina, and a portion of York County, South
Carolina which excludes the Catawba Area.
\7\ See 77 FR 30088.
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In addition, on November 16, 2017, areas were designated for the
2015 8-hour ozone NAAQS. The entire states of North Carolina and South
Carolina--including the Catawba Indian Nation--were designated
attainment/unclassifiable for the 2015 8-hour ozone NAAQS, with an
effective date on January 16, 2018.\8\
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\8\ See 82 FR 54232.
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A state may submit a request to redesignate a nonattainment area
that is attaining a NAAQS to attainment, and, if the area has met other
required criteria described in section 107(d)(3)(E) of the CAA, EPA may
approve the redesignation request.\9\ One of the criteria for
redesignation is to have an approved maintenance plan under CAA section
175A. The maintenance plan must demonstrate that the area will continue
to maintain the NAAQS for the period extending ten years after
redesignation, and it must contain such additional measures as
necessary to
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ensure maintenance and such contingency provisions as necessary to
assure that violations of the NAAQS will be promptly corrected. Eight
years after the effective date of redesignation, the state must also
submit a second maintenance plan to ensure ongoing maintenance of the
NAAQS for an additional ten years pursuant to CAA section 175A(b)
(i.e., ensuring maintenance for 20 years after redesignation).
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\9\ Section 107(d)(3)(E) of the CAA sets out the requirements
for redesignating a nonattainment area to attainment. They include
attainment of the NAAQS, full approval of the applicable SIP
pursuant to CAA section 110(k), determination that improvement in
air quality is a result of permanent and enforceable reductions in
emissions, demonstration that the state has met all applicable
section 110 and part D requirements, and a fully approved
maintenance plan under CAA section 175A.
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EPA has published long-standing guidance for states on developing
maintenance plans.\10\ The Calcagni memo provides that states may
generally demonstrate maintenance by either performing air quality
modeling to show that the future mix of sources and emission rates will
not cause a violation of the NAAQS or by showing that projected future
emissions of a pollutant and its precursors will not exceed the level
of emissions during a year when the area was attaining the NAAQS (i.e.,
attainment year inventory). See Calcagni memo at page 9. EPA clarified
in three subsequent guidance memos that certain areas could meet the
CAA section 175A requirement to provide for maintenance by showing that
the area was unlikely to violate the NAAQS in the future, using
information such as the area's design value \11\ being significantly
below the standard and the area having a historically stable design
value.\12\ EPA refers to a maintenance plan containing this streamlined
demonstration as an LMP.
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\10\ John Calcagni, Director, Air Quality Management Division,
EPA Office of Air Quality Planning and Standards (OAQPS),
``Procedures for Processing Requests to Redesignate Areas to
Attainment,'' September 4, 1992 (Calcagni memo).
\11\ The ozone design value for a monitoring site is the 3-year
average of the annual fourth-highest daily maximum 8-hour average
ozone concentrations. The design value for an ozone area is the
highest design value of any monitoring site in the area.
\12\ See ``Limited Maintenance Plan Option for Nonclassifiable
Ozone Nonattainment Areas'' from Sally L. Shaver, OAQPS, dated
November 16, 1994; ``Limited Maintenance Plan Option for
Nonclassifiable CO Nonattainment Areas'' from Joseph Paisie, OAQPS,
dated October 6, 1995; and ``Limited Maintenance Plan Option for
Moderate PM10 Nonattainment Areas'' from Lydia Wegman,
OAQPS, dated August 9, 2001. Copies of these guidance memoranda can
be found in the docket for this proposed rulemaking.
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EPA has interpreted CAA section 175A as permitting the LMP option
because section 175A of the Act does not define how areas may
demonstrate maintenance, and in EPA's experience implementing the
various NAAQS, areas that qualify for an LMP and have approved LMPs
have rarely, if ever, experienced subsequent violations of the NAAQS.
As noted in the LMP guidance memoranda, states seeking an LMP must
still submit the other maintenance plan elements outlined in the
Calcagni memo, including: An attainment emissions inventory, provisions
for the continued operation of the ambient air quality monitoring
network, verification of continued attainment, and a contingency plan
in the event of a future violation of the NAAQS. Moreover, a state
seeking an LMP must still submit its section 175A maintenance plan as a
revision to its SIP, with all attendant notice and comment procedures.
While the LMP guidance memoranda were originally written with respect
to certain NAAQS,\13\ EPA has extended the LMP interpretation of
section 175A to other NAAQS and pollutants not specifically covered by
the previous guidance memos.\14\
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\13\ The prior memos addressed: Unclassifiable areas under the
1-hour ozone NAAQS, nonattainment areas for the PM10
(particulate matter with an aerodynamic diameter less than 10
microns) NAAQS, and nonattainment areas for the carbon monoxide (CO)
NAAQS.
\14\ See, e.g., 79 FR 41900 (July 18, 2014) (Approval of the
second ten-year LMP for the Grant County 1971 SO2
maintenance area).
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In this case, EPA is proposing to approve the Catawba Area LMP
because the State has made a showing, consistent with EPA's prior LMP
guidance, that the Charlotte NC-SC 1997 8-hour NAAQS Area's ozone
concentrations are well below the 1997 8-hour ozone NAAQS and have been
historically stable, and that it has met the other maintenance plan
requirements. DHEC submitted this LMP for the Catawba Area to fulfill
the second maintenance plan requirement in the Act. EPA's evaluation of
the Catawba Area LMP is presented below.
In June of 2011, DHEC submitted to EPA a request to redesignate the
York County, South Carolina portion of the Charlotte NC-SC 1997 8-hour
NAAQS Area (which includes the Catawba Area), to attainment for the
1997 8-hour ozone NAAQS. This submittal included a plan to provide for
maintenance of the 1997 8-hour ozone NAAQS in the Charlotte NC-SC 1997
8-hour NAAQS Area through 2022 as a revision to the South Carolina SIP.
EPA approved South Carolina's Charlotte NC-SC 1997 8-hour NAAQS Area
Maintenance Plan and the State's request to redesignate the South
Carolina portion of the Charlotte NC-SC 1997 NAAQS Area to attainment
for the 1997 8-hour ozone NAAQS effective December 26, 2012.\15\
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\15\ See 77 FR 75862 (December 26, 2012).
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Under CAA section 175A(b), states must submit a revision to the
first maintenance plan eight years after redesignation to provide for
maintenance of the NAAQS for ten additional years following the end of
the first 10-year period. EPA's final implementation rule for the 2008
8-hour ozone NAAQS revoked the 1997 8-hour ozone NAAQS and stated that
one consequence of revocation was that areas that had been redesignated
to attainment (i.e., maintenance areas) for the 1997 NAAQS no longer
needed to submit second 10-year maintenance plans under CAA section
175A(b).\16\ On December 11, 2015, EPA redesignated the South Carolina
portion of the Charlotte NC-SC 2008 NAAQS Area (which does not include
the Catawba Area) as attainment for the 2008 8-hour ozone NAAQS, and
the designation became effective on January 11, 2016. See 80 FR 76865.
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\16\ See 80 FR 12264, 12315 (March 6, 2015).
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In South Coast Air Quality Management District v. EPA, the United
States Court of Appeals for the District of Columbia Circuit (D.C.
Circuit) vacated EPA's interpretation that, because of the revocation
of the 1997 8-hour ozone NAAQS, second maintenance plans were not
required for ``orphan maintenance areas,'' i.e., areas that had been
redesignated to attainment for the 1997 8-hour ozone NAAQS (maintenance
areas) and were designated attainment for the 2008 ozone NAAQS. South
Coast, 882 F.3d 1138 (D.C. Cir. 2018). Thus, states with these ``orphan
maintenance areas'' under the 1997 8-hour ozone NAAQS must submit
maintenance plans for the second maintenance period. Accordingly,
through a letter dated July 7, 2020, South Carolina submitted a second
maintenance plan covering the Catawba Area that provides for attainment
of the 1997 8-hour ozone NAAQS through 2032.\17\
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\17\ In an email dated October 18, 2021, DHEC clarified that the
end of the maintenance plan submitted on June 7, 2020, is 2032.
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In recognition of the continuing record of air quality monitoring
data showing ambient 8-hour ozone concentrations in the Charlotte NC-SC
1997 8-hour NAAQS Area well below the 1997 8-hour ozone NAAQS, DHEC
chose the LMP option for the development of its second 1997 8-hour
ozone NAAQS maintenance plan covering the Catawba Area. On July 7,
2020, DHEC adopted this second 10-year 1997 8-hour ozone maintenance
plan, and subsequently submitted the Catawba Area LMP to EPA as a
revision to the South Carolina SIP.
III. South Carolina's SIP Submittal
As mentioned above, on July 7, 2020, DHEC submitted the Catawba
Area LMP
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to EPA as a revision to the South Carolina SIP. The submittal includes
the LMP, air quality data, a summary of the previous emissions
inventory and a conclusion regarding future emission levels, and
attachments, as well as certification of adoption of the plan by DHEC.
Attachments to the plan include documentation of notice, opportunity
for hearing and public participation prior to adoption of the plan by
DHEC on July 7, 2020, and state legal authority. The LMP notes that
South Carolina's LMP submittal for the remainder of the 20-year
maintenance period for the Catawba Area is in response to the D.C.
Circuit's decision overturning aspects of EPA's Implementation Plan
rule. The Catawba Area LMP does not include any additional emissions
reduction measures but relies on the same emissions reduction strategy
as the first 10-year Maintenance Plan that provides for the maintenance
of the 1997 8-hour ozone NAAQS through 2022. Prevention of significant
deterioration (PSD) requirements and control measures contained in the
SIP will continue to apply, and federal measures (e.g., Federal motor
vehicle control program) will continue to be implemented in the Catawba
Area.
IV. EPA's Evaluation of South Carolina's SIP Submittal
EPA has reviewed the Catawba Area LMP which is designed to maintain
the 1997 8-hour ozone NAAQS within the Catawba Area through the end of
the 20-year period beyond redesignation, as required under CAA section
175A(b).
As discussed below, the Catawba Area's impact on the larger
Charlotte NC-SC 1997 8-hour NAAQS Area is very limited due to its size,
population, and emissions profile. In addition, the monitoring values
in the Charlotte NC-SC 1997 8-hour NAAQS Area, including the Catawba
Area, are well below the NAAQS. As a result, EPA is proposing to
approve the Catawba Area LMP as meeting the 175A requirements. The
following is a more detailed summary of EPA's interpretation of the
section 175A requirements \18\ and EPA's evaluation of how each
requirement is met.
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\18\ See Calcagni memo.
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A. Area Characteristics
The Catawba Indian Nation tribal lands are comprised of a total of
approximately 1,000 acres, in two sections along the Catawba River in
the eastern portion of York County, South Carolina.\19\ The total
Catawba Indian Nation population is 3,370 (2010 Census), however, based
on recent census estimates, the population of the Reservation is only
1,288 with 517 housing units within the Reservation.\20\ According to
the 2019 census estimates, the total York County population is 280,979,
and the Reservation is home to 0.46 percent of York County's
population.\21\ The Reservation is a residential area which contains no
industry, no limited access highways or transportation facilities, and
only a few miles of secondary roads. There is a boat ramp but there are
no airports, helipads, railroad tracks, or associated facilities. The
Reservation has no shopping centers or industrial sites. The only
community facilities, which are of modest size, are the Tribal offices
and the Senior Center.
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\19\ As described in the July 7, 2020 Submittal, the Catawba
Area consists of two tracts of land along the Catawba River with a
total land base of approximately 1,000 acres, which comprises only
0.002 percent of the land area of York County. See Technical Support
Document for Charlotte-Rock Hill, NC-SC Area Designations for the
2008 Ozone National Ambient Air Quality Standards, available at
https://www.regulations.gov/search?filter=EPA-HQ-OAR-2008-0476-0642.
\20\ See Catawba Reservation, U.S. Census Bureau, 2015-2019
American Community Survey 5-Year Estimates, available at https://www.census.gov/tribal/?aianihh=0525.
\21\ Id., see also https://www.census.gov/quickfacts/yorkcountysouthcarolina (showing York County, South Carolina with a
2019 estimated population of 280,979 and a 2020 census population of
282,090).
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B. Attainment Emissions Inventory
For maintenance plans, a state should develop a comprehensive,
accurate inventory of actual emissions for an attainment year to
identify the level of emissions which is sufficient to maintain the
NAAQS. A state should develop this inventory consistent with EPA's most
recent guidance on emissions inventory development. For ozone, the
inventory should be based on typical summer day emissions of VOC and
NOX, as these pollutants are precursors to ozone formation.
The 175A maintenance plan approved by EPA included an attainment
inventory for the South Carolina portion of the Charlotte NC-SC 1997 8-
hour NAAQS Area that reflects typical summer day VOC and NOX
emissions in 2010.\22\ As previously mentioned, the Catawba Area is
included in the South Carolina portion of the Charlotte NC-SC 1997 8-
hour NAAQS Area.
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\22\ See 77 FR 68087 (November 15, 2012) and 77 FR 75862
(December 26, 2012).
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Because the Catawba Nation Reservation is a small residential area,
both geographically and in population, with no industrial sites, no
limited access highways, no transportation facilities, and no point
sources of ozone precursors, there are no estimates of VOC and
NOX emissions from the Catawba Area. Given the unique nature
of the Catawba Area and the air quality analysis in section IV.C,
below, EPA does not believe that a detailed accounting of attainment
level emissions is necessary in this instance.
C. Maintenance Demonstration
The maintenance demonstration requirement is considered to be
satisfied in a LMP if the state can provide sufficient weight of
evidence indicating that air quality in the area is well below the
level of the NAAQS, that past air quality trends have been shown to be
stable, and that the probability of the area experiencing a violation
over the second 10-year maintenance period is low.\23\ These criteria
are evaluated below with regard to the Catawba Area.
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\23\ See Calcagni memo.
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1. Evaluation of Ozone Air Quality Levels
To attain the 1997 8-hour ozone NAAQS, the three-year average of
the fourth-highest daily maximum 8-hour average ozone concentrations
(design value) at each monitor within an area must not exceed 0.08 ppm.
Based on the rounding convention described in 40 CFR part 50, Appendix
I, the NAAQS is attained if the design value is 0.084 ppm or below. At
the time of submission, EPA evaluated quality assured and certified
2016-2018 monitoring data and determined that the highest design value
for the Charlotte NC-SC 1997 8-hour NAAQS Area was 0.070 ppm, or 83
percent of the level of the 1997 8-hour ozone NAAQS (measured at the
University Meadows monitor in Mecklenburg, North Carolina (AQS ID: 37-
119-0046)), and the design value for the Catawba Area monitor (AQS ID:
45-091-8801) was 0.064 ppm, or 76 percent of the level of the 1997 8-
hour ozone NAAQS. Based on quality assured and certified monitoring
data for 2018-2020, the current, highest design value for the Charlotte
NC-SC 1997 8-hour NAAQS Area is 0.067 ppm, or 80 percent of the level
of the 1997 8-hour ozone NAAQS (measured at the University Meadows
monitor and the Garinger High School Monitor in Mecklenburg, NC (AQS
ID: 37-119-0041)), and the current design value for the Catawba Area
monitor is 0.062 ppm, or 74 percent of the level of the 1997 8-hour
ozone NAAQS. Consistent with prior guidance, EPA believes that if the
most recent air quality design value for the area is at a level that is
well below the NAAQS (e.g., below 85 percent of the NAAQS, or in this
case below 0.071 ppm), then
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EPA considers the state to have met the section 175A requirement for a
demonstration that the area will maintain the NAAQS for the requisite
period. Such a demonstration assumes continued applicability of
prevention of significant deterioration requirements and any control
measures already in the SIP and that Federal measures will remain in
place through the end of the second 10-year maintenance period, absent
a showing consistent with section 110(l) that such measures are not
necessary to assure maintenance.
Table 3 presents the design values for each monitor in the
Charlotte NC-SC 1997 8-hour NAAQS Area over the 2008-2020 period. As
shown in Table 3, all sites have been below the level of the 1997 8-
hour ozone NAAQS since the area was redesignated to attainment, and the
most current design value is below the level of 85 percent of the
NAAQS, consistent with prior LMP guidance.
Table 3--1997 8-Hour Ozone NAAQS Design Values (DV) (ppm) at Monitoring Sites in the Charlotte NC-SC 1997 NAAQS Area for the 2008-2020 Time Period
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2008- 2009- 2010- 2011- 2012- 2013- 2014- 2015- 2016- 2017- 2018-
Location County (state)/ AQS site ID 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
tribal land DV DV DV DV DV DV DV DV DV DV DV
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Catawba Area Monitor........... Catawba Indian 45-091-8801 (*) (*) (*) (*) (*) (*) (*) (*) 0.064 0.064 0.062
Nation.
Arrowood....................... Mecklenburg (NC). 37-119-1005 0.073 0.076 0.077 0.072 0.066 (**) (**) (**) (**) (**) (**)
Crouse......................... Lincoln (NC)..... 37-109-0004 0.072 0.071 0.075 0.072 0.068 0.065 0.067 0.067 0.065 0.064 0.060
Enochville..................... Rowan (NC)....... 37-159-0022 0.077 0.076 0.077 0.072 (***) (***) (***) (***) (***) (***) (***)
Garinger High School........... Mecklenburg (NC). 37-119-0041 0.078 0.079 0.083 0.078 0.070 0.068 0.069 0.069 0.068 0.070 0.067
County Line.................... Mecklenburg (NC). 37-117-1009 0.082 0.078 0.083 0.078 0.073 0.067 (****) (****) (****) (****) (****)
University Meadows............. Mecklenburg (NC). 37-119-0046 (****) (****) (****) (****) (****) (****) 0.070 0.070 0.070 0.069 0.067
Rockwell....................... Rowan (NC)....... 37-159-0021 0.077 0.075 0.078 0.073 0.068 0.064 0.065 0.064 0.062 0.062 0.061
Monroe School.................. Union (NC)....... 37-179-0003 0.072 0.070 0.073 0.070 0.068 0.065 0.068 0.067 0.068 0.068 0.063
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* The ozone monitor in the Catawba Indian Nation (AQS Site ID 45-091-8801) began operation for the 2016 ozone season.
** The Arrowood monitor in Mecklenburg County (AQS Site ID 37-119-1005) was shut down in 2014.
*** The Enochville School monitor in Rowan County (AQS Site ID 37-159-0022) was shut down in 2013.
**** In 2014, the ozone monitor at Mecklenburg County Line (AQS Site ID 37-117-1009) changed locations to University Meadows (AQS ID 37-119-0046).
Therefore, the Catawba Area is eligible for the LMP option, and EPA
proposes to find that the long record of monitored ozone concentrations
that attain the NAAQS, together with the continuation of existing VOC
and NOX emissions control programs in the Charlotte NC-SC
1997 8-hour NAAQS Area, adequately provide for the maintenance of the
1997 8-hour ozone NAAQS in the Catawba Area through the second 10-year
maintenance period and beyond.
Additional supporting information that the Area is expected to
continue to maintain the NAAQS can be found in projections of future
year design values that EPA recently completed for the Revised Cross-
State Air Pollution Rule Update for the 2008 Ozone NAAQS that EPA
finalized on April 30, 2021.\24\ Those projections, made for the year
2023, show that the maximum design value for the Charlotte NC-SC 1997
Ozone Area is expected to be 60.3 ppb and the maximum design value of
the Catawba Area monitor is expected to be 53.3 ppb. EPA is not
proposing to make any finding in this action regarding interstate
transport obligations for any state.
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\24\ On April 30, 2021, EPA published the final Revised Cross-
State Air Pollution Rule (CSAPR) Update (RCU) using updated modeling
that focused on analytic years 2023 and 2028 and an
``interpolation'' analysis of these modeling results to generate air
quality and contribution values for the 2021 analytic year. See 86
FR 23054. https://www.govinfo.gov/content/pkg/FR-2021-04-30/pdf/2021-05705.pdf. This modeling included projected ozone design values
for ozone monitors in the Catawba Area and Charlotte SC-NC
maintenance areas.
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2. Stability of Ozone Levels
As discussed above, the Charlotte NC-SC 1997 8-hour NAAQS Area has
maintained air quality below the 1997 8-hour ozone NAAQS over the past
eleven design values. Additionally, the design value data shown in
Table 3 illustrates that ozone levels have been relatively stable over
this timeframe, with a modest downward trend. For example, the data in
Table 3 indicates that the largest, year over year change in design
value at any one monitor during these eleven years was 0.008 ppm which
occurred between the 2013 design value and the 2014 design value,
representing approximately a 10 percent decrease at monitor 37-119-0041
(Garinger High School). Furthermore, there is an overall downward trend
in design values for the Charlotte NC-SC 1997 8-hour NAAQS Area. See,
e.g., Table 1, above, data for monitor 37-159-0021 (Rockwell)0.016 ppm,
or 20.8 percent). This downward trend in ozone levels, coupled with the
relatively small, year-over-year variation in ozone design values,
makes it reasonable to conclude that the Catawba Area will not exceed
the 1997 8-hour ozone NAAQS during the second 10-year maintenance
period.
D. Monitoring Network and Verification of Continued Attainment
EPA periodically reviews the ozone monitoring networks operated and
maintained by the states in accordance with 40 CFR part 58. The network
plans, which are submitted annually to EPA, are consistent with the
ambient air quality monitoring network assessment. It is important to
note that the Charlotte NC-SC 1997 8-hour NAAQS Area was designated
nonattainment due to violating monitors in the North Carolina portion
of that area and that South Carolina has never operated any part 58
monitors in the Charlotte NC-SC 1997 8-hour NAAQS Area.\25\ \26\ North
Carolina operates a network plan with multiple monitors within the
boundary of the Charlotte NC-SC 1997 8-hour NAAQS Area. The annual
network plan developed by North Carolina follows a public notification
and review process. EPA has reviewed and approved the North Carolina's
2020 Ambient Air Monitoring Network Plan (``2020 Annual Network Plan'')
which addresses the relevant monitors used to determine attainment for
the Charlotte NC-SC 1997 8-hour NAAQS Area.\27\
[[Page 67407]]
Separately, North Carolina has committed to maintain the monitoring
network that is used to monitor ozone for compliance with the 1997 8-
hour ozone NAAQS, which includes the monitors within the North Carolina
portion of the Charlotte NC-SC 1997 8-hour NAAQS Area.\28\
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\25\ See 69 FR 23858 (April 30, 2004) for the final designation
action for the 1997 8-hour ozone NAAQS and https://www.epa.gov/ground-level-ozone-pollution/1997-ozone-national-ambient-air-quality-standards-naaqs-nonattainment for the monitoring data
associated with the designation for the 1997 8-hour ozone NAAQS.
\26\ South Carolina maintains one monitor in York County.
Although that monitor is near the maintenance boundary, it is not
used to determine compliance of the Charlotte NC-SC 1997 8-hour
NAAQS Area with the 1997 8-hour ozone NAAQS because it is not
located within the maintenance area.
\27\ See October 30, 2020, letter and approval from Caroline
Freeman, Director, Air and Radiation Division, EPA Region 4 to Mike
Abraczinskas, Director, Division of Air Quality, North Carolina
Department of Environmental Quality, available in the docket for
this proposed action.
\28\ See 78 FR 72036 (December 2, 2013), 78 FR 45152 (July 26,
2013).
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Subsequent to the nonattainment designation for the 1997 8-hour
ozone NAAQS, the Catawba Indian Nation, under a CAA section 103 grant
agreement with EPA, erected and operates a monitor in the Catawba Area.
EPA provides oversight of the Catawba Indian Nation's operation of this
monitor through normal grant monitoring activities on annual basis.
To verify the attainment status of the Area over the maintenance
period, the maintenance plan should contain provisions for continued
operation of an appropriate, EPA-approved monitoring network in
accordance with 40 CFR part 58. As noted above, North Carolina's 2020
Annual Network Plan, which covers the monitors within the Charlotte NC-
SC 1997 8-hour NAAQS Area, has been approved by EPA in accordance with
40 CFR part 58, and North Carolina has committed to continue to
maintain a network in accordance with EPA requirements. Although South
Carolina does not operate any part 58 monitors in the Charlotte NC-SC
1997 8-hour NAAQS Area, the State commits to continue operating an
approved ozone monitoring network near the South Carolina portion of
that area; commits to consult with the EPA prior to making changes to
the existing monitoring network should changes become necessary in the
future; and acknowledges the obligation to meet monitoring requirements
in compliance with 40 CFR part 58.\29\ EPA proposes to find that there
is an adequate ambient air quality monitoring network in the Charlotte
NC-SC 1997 8-hour NAAQS Area to verify continued attainment of the 1997
8-hour ozone NAAQS.
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\29\ See South Carolina's July 7, 2020, SIP submittal at page 7.
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E. Contingency Plan
Section 175A(d) of the CAA requires that a maintenance plan include
contingency provisions. The purpose of such contingency provisions is
to prevent future violations of the NAAQS or to promptly remedy any
NAAQS violations that might occur during the maintenance period. These
contingency measures are required to be implemented expeditiously once
they are triggered by a future violation of the NAAQS or some other
trigger. The state should identify specific triggers which will be used
to determine when the contingency measures need to be implemented.
The trigger identified in the Catawba Area LMP is a Quality
Assured/Quality Controlled (QA/QC) violating design value of the 1997
8-hour ozone NAAQS within or near the Charlotte NC-SC 1997 8-hour NAAQS
Area.\30\ If this trigger is activated, the maintenance plan requires
South Carolina to conduct analyses to determine the emission control
measures that will be necessary for attaining or maintaining the 1997
8-hour ozone NAAQS. The maintenance plan outlines the steps that South
Carolina must conduct to determine control measures, including
verification and analysis of data related to the exceedance, and
possible causes. South Carolina will adopt and implement appropriate
contingency measures tailored to the specific circumstances of the
violation (or increased concentrations) within 24 months after a
triggering event.\31\ \32\
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\30\ If QA/QC data indicates a violating design value for the 8-
hour ozone NAAQS, then the triggering event will be the date of the
design value violation, and not the final QA/QC date. However, if
initial monitoring data indicates a possible design value violation
but later QA/QC indicates that a NAAQS violation did not occur, then
a triggering event will not have occurred, and contingency measures
will not need to be implemented.
\31\ As stated above, the Catawba Area LMP contains the same
contingency measures that were included in the first 10-year
maintenance plan, as tailored to the Catawba Area. For example, some
contingency measures included only in the first 10-year LMP would
have limited emissions reductions or were not applicable based on
the characteristics of the Catawba Area (for example, alternative
fuel programs for fleet vehicle operations, as there are no vehicle
fleets in the Catawba Area). In addition, South Carolina added a
provision to work closely with the York County Air Coalition for
outreach and stakeholder input, contingency measure support, and
community emission reduction efforts, which is a logical extension
in recognition that this LMP is for a subset of the larger South
Carolina portion of the Charlotte NC-SC 1997 8-hour NAAQS Area.
\32\ See the Contingency Plan section of the Catawba Area LMP
for further information regarding the contingency plan, including
measures that South Carolina will consider for adoption if the
trigger is activated, as well as additional steps and notification
to EPA if DHEC determines additional time than 24 months is
necessary to implement specific contingency measures.
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EPA proposes to find that the contingency provisions in South
Carolina's second maintenance plan for the 1997 8-hour ozone NAAQS meet
the requirements of the CAA section 175A(d).
F. Conclusion
EPA proposes to find that the Catawba Area LMP for the 1997 8-hour
ozone NAAQS includes an approvable update of various elements of the
initial EPA-approved Maintenance Plan for the 1997 8-hour ozone NAAQS.
EPA also proposes to find that the Catawba Area qualifies for the LMP
option and adequately demonstrates maintenance of the 1997 8-hour ozone
NAAQS through the documentation of monitoring data showing maximum 1997
8-hour ozone levels below the NAAQS and historically stable design
values. EPA believes the Catawba Area LMP, which retains existing
control measures in the SIP, is sufficient to provide for maintenance
of the 1997 8-hour ozone NAAQS in the Catawba Area over the second
maintenance period (i.e., through 2032) and thereby satisfies the
requirements for such a plan under CAA section 175A(b). EPA is
therefore proposing to approve South Carolina's July 7, 2020,
submission of the Catawba Area LMP as a revision to the South Carolina
SIP.
V. Transportation Conformity and General Conformity
Transportation conformity is required by section 176(c) of the CAA.
Conformity to a SIP means that transportation activities will not
produce new air quality violations, worsen existing violations, or
delay timely attainment of the NAAQS. See CAA 176(c)(1)(A) and (B).
EPA's transportation conformity rule at 40 CFR part 93 subpart A
requires that transportation plans, programs, and projects conform to
SIPs and establishes the criteria and procedures for determining
whether they conform. The conformity rule generally requires a
demonstration that emissions from the Regional Transportation Plan
(RTP) and the Transportation Improvement Program (TIP) are consistent
with the motor vehicles emissions budget (MVEB) contained in the
control strategy SIP revision or maintenance plan. See 40 CFR 93.101,
93.118, and 93.124. A MVEB is defined as ``the portion of the total
allowable emissions defined in the submitted or approved control
strategy implementation plan revision or maintenance plan for a certain
date for the purpose of meeting reasonable further progress milestones
or demonstrating attainment or maintenance of the NAAQS, for any
criteria pollutant or its precursors, allocated to highway and transit
vehicle use and emissions.'' See 40 CFR 93.101.
Under the conformity rule, LMP areas may demonstrate conformity
without a regional emissions analysis. See 40 CFR 93.109(e). On October
9, 2012, EPA made a finding that the MVEBs for the first 10 years of
the 1997 8-hour ozone
[[Page 67408]]
maintenance plan for the South Carolina portion of the Charlotte NC-SC
1997 8-hour NAAQS Area were adequate for transportation conformity
purposes. In a Federal Register notice dated September 24, 2012, EPA
notified the public of that finding. See 77 FR 58829. This adequacy
determination became effective on October 9, 2012. After approval of
this LMP or an adequacy finding for this LMP, there is no requirement
to meet the budget test pursuant to the transportation conformity rule
for the Catawba Area. All actions that would require a transportation
conformity determination for the Catawba Area under EPA's
transportation conformity rule provisions are considered to have
already satisfied the regional emissions analysis and ``budget test''
requirements in 40 CFR 93.118 as a result of EPA's adequacy finding for
this LMP. See 69 FR 40004 (July 1, 2004).
However, because LMP areas are still maintenance areas, certain
aspects of transportation conformity determinations still will be
required for transportation plans, programs, and projects.
Specifically, for such determinations, RTPs, TIPs, and transportation
projects still will have to demonstrate that they are fiscally
constrained (40 CFR 93.108) and meet the criteria for consultation (40
CFR 93.105) and Transportation Control Measure implementation in the
conformity rule provisions (40 CFR 93.113) as well as meet the hot-spot
requirements for projects (40 CFR 93.116).\33\ Additionally, conformity
determinations for RTPs and TIPs must be determined no less frequently
than every four years, and conformity of plan and TIP amendments and
transportation projects is demonstrated in accordance with the timing
requirements specified in 40 CFR 93.104. In addition, in order for
projects to be approved they must come from a currently conforming RTP
and TIP. See 40 CFR 93.114 and 40 CFR 93.115. The Charlotte NC-SC 2008
NAAQS Area must continue to meet all of the applicable requirements of
the general conformity regulations.
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\33\ A conformity determination that meets other applicable
criteria in Table 1 of paragraph (b) of this section (93.109(e)) is
still required, including the hot-spot requirements for projects in
CO, PM10, and fine particulate matter (PM2.5)
areas.
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VI. Proposed Action
Under sections 110(k) and 175A of the CAA and for the reasons set
forth above, EPA is proposing to approve the Catawba Area LMP for the
1997 8-hour ozone NAAQS, submitted by DHEC on July 7, 2020, as a
revision to the South Carolina SIP. EPA is proposing to approve the
Catawba Area LMP because it includes an acceptable update of various
elements of the 1997 8-hour ozone NAAQS Maintenance Plan approved by
EPA for the first 10-year period and retains the relevant provisions of
the SIP.
EPA also finds that the Catawba Area qualifies for the LMP option
and that therefore the Catawba Area LMP adequately demonstrates
maintenance of the 1997 8-hour ozone NAAQS through documentation of
monitoring data showing maximum 1997 8-hour ozone levels well below the
NAAQS and continuation of existing control measures. EPA believes the
Catawba Area's 1997 8-Hour Ozone LMP to be sufficient to provide for
maintenance of the 1997 8-hour ozone NAAQS in the Catawba Area over the
second 10-year maintenance period, through 2032, and thereby satisfy
the requirements for such a plan under CAA section 175A(b).
VII. 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. This proposed action
merely proposes to approve state law as meeting Federal requirements
and does not impose additional requirements beyond those imposed by
state law. For that reason, this proposed action:
Is not a significant regulatory action 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);
Does not impose an information collection burden under the
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
Is 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.);
Does 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);
Does not have Federalism implications as specified in
Executive Order 13132 (64 FR 43255, August 10, 1999);
Is not an economically significant regulatory action based
on health or safety risks subject to Executive Order 13045 (62 FR
19885, April 23, 1997);
Is not a significant regulatory action subject to
Executive Order 13211 (66 FR 28355, May 22, 2001);
Is 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
Does 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).
Because this Catawba Area LMP merely proposes to approve state law
as meeting Federal requirements and does not impose additional
requirements beyond those imposed by state law, this Catawba Area LMP
for the State of South Carolina does not have Tribal implications as
specified by Executive Order 13175 (65 FR 67249, November 9, 2000).
Therefore, this action will not impose substantial direct costs on
Tribal governments or preempt Tribal law. The Catawba Indian Nation
(CIN) Reservation is located within the boundary of York County, South
Carolina. Pursuant to the Catawba Indian Claims Settlement Act, S.C.
Code Ann. 27-16-120 (Settlement Act), ``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.'' The CIN also retains authority to
impose regulations applying higher environmental standards to the
Reservation than those imposed by state law or local governing bodies,
in accordance with the Settlement Act.
List of Subjects in 40 CFR Part 52
Environmental protection, Air pollution control, Incorporation by
reference, Intergovernmental Relations, Nitrogen oxides, Ozone,
Reporting and recordkeeping requirements, Volatile Organic Compounds.
Authority: 42 U.S.C. 7401 et seq.
Dated: November 17, 2021.
John Blevins,
Acting Regional Administrator,Region 4.
[FR Doc. 2021-25527 Filed 11-24-21; 8:45 am]
BILLING CODE 6560-50-P
