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Federal Register / Vol. 86, No. 125 / Friday, July 2, 2021 / Proposed Rules
requirements for attainment areas and, thus, must meet the relevant NAAQS. In addition, the area must not contribute to ambient air quality in a nearby area that does not meet the NAAQS. See the definitions for nonattainment area, attainment area, and unclassifiable area in CAA section 107d1Aiiii.
In its designations under the 2010 1hour SO2 NAAQS, EPA has generally defined an attainment/unclassifiable area as an area that, based on available information including but not limited to appropriate monitoring data and/or modeling analyses, EPA has determined meets the NAAQS and determined that the available information indicates that the area does not likely contribute to ambient air quality in a nearby area that does not meet the NAAQS. EPA is proposing to find that the Brunswick County Area now meets the definition of attainment/unclassifiable based upon a 3-year certified and complete design value of air quality monitoring data that demonstrates attainment, i.e., no violations of the 2010 1-hour SO2
NAAQS, and the fact that sources in Brunswick County are not contributing to a nearby area that is violating the NAAQS. EPA preliminarily finds this information sufficient for the purposes of redesignating an area from unclassifiable to attainment/
unclassifiable. Such redesignations are functionally similar to initial designations and are not subject to CAA
section 107d3E, which, amongst
other things, requires attainment to be due to permanent and enforceable measures and which requires a demonstration that the area will maintain the NAAQS for 10 years. For the Brunswick County Area, DEQ
submitted a request to redesignate the area from unclassifiable to attainment/
unclassifiable on April 23, 2021.12
III. What is EPAs rationale for proposing to redesignate the area?
The Brunswick County Area includes the CPI Southport facility, which met the Round 2 criteria as discussed in Section I of this document, and thus, EPA was required to designate the Area in 2016, under the March 2, 2015, courtordered schedule. After review of all available information at that time, including modeling provided by the State, EPA was unable to determine the Areas attainment status, and therefore, designated Brunswick County in its entirety as unclassifiable in Round 2 of designations for the 2010 1-hour SO2
primary NAAQS on July 12, 2016. EPAs rationale for the unclassifiable designation is fully explained in the final Round 2 designations TSD.13 For Brunswick County, DAQ selected the monitoring pathway for purposes of air quality characterization pursuant to EPAs SO2 Data Requirements Rule DRR 80 FR 51052, August 21, 2015.14
Pursuant to requirements under the DRR
to characterize the air quality in the area around CPI Southport, North Carolina
installed an SO2 monitor in the area of maximum concentration for the CPI
Southport facility in accordance with EPAs Monitoring TAD and 40 CFR
parts 50 and 58 and began collecting data on January 1, 2017.15
On April 23, 2021, North Carolina submitted a letter to EPA requesting that the entirety of Brunswick County be redesignated to attainment/
unclassifiable based on the newly available monitoring information, which demonstrates attainment of the 2010 1hour SO2 NAAQS. To evaluate North Carolinas redesignation request, EPA
considered the design value for the air quality monitor in Brunswick County by assessing the most recent three consecutive years i.e., 20182020 of quality-assured, certified ambient air quality data in the EPA Air Quality System AQS using data from a monitor that was sited and operated in accordance with 40 CFR parts 50 and 58. Procedures for using monitored air quality data to determine whether a violation has occurred are provided in 40 CFR part 50 Appendix T, as revised in the 2010 1-hour SO2 NAAQS
rulemaking. As noted previously, the 2010 1-hour SO2 NAAQS is met when the design value is 75 ppb or less. Table 1, below, contains the most recent three years of ambient SO2 monitoring data available and shows that the Area is attaining the 2010 1-hour SO2 NAAQS
with a design value of 54 ppb for the period 20182020.16

TABLE 12010 SO2 NAAQS MONITORING DATA FOR THE BRUNSWICK COUNTY AREA
AQS ID

Monitor site
2018 99th percentile ppb
2019 99th percentile ppb
2020 99th percentile ppb
20182020
design value ppb
370190005

Southport

55

60

46

54

lotter on DSK11XQN23PROD with PROPOSALS1

Brunswick County SO2 monitoring measurements for the third quarter July, August, and September of 2018 did not meet the data completeness requirement of 75% data capture. However, a valid design value for 2018 to 2020 was obtained using the data substitution procedures in 40 CFR part 50, Appendix T, Section 3ciiB.

Additionally, on March 31, 2020, the CPI Southport facility ceased operation, and the DAQ rescinded the facilitys operating permit effective April 1, 2021.17 After reviewing North Carolinas
request under CAA section 107d3D
and all available information, EPA is proposing to find that the three years of monitored ambient SO2 data from 2018
2020 adequately characterize the SO2 air
quality in Brunswick County and demonstrate attainment of the 2010
1-hour SO2 NAAQS in the Area.
Additionally, there is no evidence of monitored or modeled violations in the
category. See 83 FR 1098 January 9, 2018 and 83
FR 25776 June 4, 2018. EPA reserves the attainment category for when EPA redesignates a nonattainment area that has attained the relevant NAAQS and has an approved maintenance plan.
12 This redesignation request is included in the docket for this proposed action.
13 The final Round 2 designations TSD can be found at https www.epa.gov/sites/production/
files/2016-07/documents/r4_nc_final_designation_
tsd_06302016.pdf.
14 Data Requirements Rule for the 2010 1-Hour Sulfur Dioxide SO2 Primary National Ambient Air Quality Standard NAAQS, Final Rule, 80 FR
51052, August 21, 2015 https www.govinfo.gov/

content/pkg/FR-2015-08-21/pdf/2015-20367.pdf. In accordance with the DRR, 40 CFR part 51, subpart BB, through a letter dated June 30, 2016, North Carolina notified EPA that the State chose to characterize peak 1-hour SO2 concentrations for CPI
through air quality monitoring. See https
www.epa.gov/sites/production/files/2016-07/
documents/north_carolina_source_
characterization.pdf.
15 The monitor is located at the site of maximum concentration based on modeling following the procedures in EPA SO2 Monitoring TADs. More details on the analyses used to support the monitor placement are contained in the states 2016 annual
monitoring annual network plan located in the docket for this proposed action.
16 North Carolina early certified the Southport monitor 20182020 air quality data in AQS on January 13, 2021. See Table 2 in North Carolinas April 23, 2021, redesignation request.
17 The DAQs April 1, 2021 letter rescinding Air Quality Permit No. 05884T21 and the January 20, 2021, certified letter from Mr. Frank Hayward, General Manager, CPI USA North Carolina, LLCSouthport Plant to Mr. Brad Newland, P.E., Regional Air Quality Supervisor, Wilmington Regional Office, NC Division of Air Quality, requesting permit recission are located in the docket for this proposed action.

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