Federal Register - August 25, 2021
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Source: Federal Register
47388
Federal Register / Vol. 86, No. 162 / Wednesday, August 25, 2021 / Rules and Regulations
Planning Organization GCLMPO
which covers Gaston, Cleveland, and Lincoln counties. Although Cleveland County is included in the GCLMPO
planning boundary, it was not included in the North Carolina portion of the Charlotte Maintenance Area. Each MPO
has its own budget referred to as a subarea budget or sub-area MVEBs. The York County, South Carolina portion of this maintenance area has a separate MPO and budgets. The South Carolina portion of the maintenance area implements transportation conformity independent of the North Carolina portion.
EPA originally approved NCDAQs 2008 8-hour ozone redesignation request and maintenance SIP for the North Carolina portion of the Charlotte Maintenance Area on July 28, 2015 80
FR 44873, with base year NOX and VOC
actual emissions inventories for 2014;
projected, future, interim year inventories for 2015, 2018, and 2022;
and projected final year emission
inventory for 2026. On August 17, 2015
80 FR 49164, EPA approved North Carolinas section 110l noninterference demonstration requesting relaxation of the Federal Reid Vapor Pressure from 7.8 pounds per square inch psi to 9.0
psi and a revision to the 2026 NOX and VOC sub-area MVEBs for Mecklenburg and Gaston Counties only. See 80 FR
44868.
On September 11, 2019 84 FR 47889, EPA approved NCDAQs July 25, 2018, SIP revision related to North Carolinas I/M Program. The September 11, 2019, SIP approval updated the on-road mobile source inventory and revised the 2026 sub-area VOC and NOX budgets;
these remain the current SIP-approved MVEBs and inventories. The revised 2026 MVEBs became effective on October 11, 2019.
EPAs analysis of North Carolinas July 16, 2020, SIP submittal indicates that maintenance will continue to be demonstrated for the Charlotte Maintenance Area after allocation of a
portion of the safety margin to the 2026
MVEBs because the total level of emissions from all source categories remains equal to or less than the attainment level of emissions.
In a notice of proposed rulemaking NPRM, published in the Federal Register on June 23, 2021 86 FR 32850, EPA proposed to approve the July 16, 2020, SIP revision. The details of North Carolinas submittal and the rationale for EPAs action are further explained in the NPRM. Comments on the June 23, 2021, NPRM were due on or before July 23, 2021. EPA did not receive any comments.
Tables 1 through 3, below, provide the newly revised 2026 NOX and VOC
sub-area MVEBs with the new safety margin 1 allocations in kilograms per day kg/day for transportation conformity purposes 2014 is only shown for illustration because no changes are being made to the MVEBs for that year.
TABLE 1CABARRUS ROWAN METROPOLITAN PLANNING ORGANIZATION CRMPO MVEBS IN 2014 AND 2026
kg/day
Base On-road Emissions
Safety margin allocated to MVEB
Conformity MVEB
2014 NOX
2014 VOC
11,814
11,814
7,173
7,173
2026 NOX
2026 VOC
3,381
1,522
4,903
3,371
1,517
4,888
Includes the portion of Cabarrus and Rowan Counties in the maintenance area.
TABLE 2GASTON-CLEVELAND-LINCOLN METROPOLITAN PLANNING ORGANIZATION GCLMPO MVEBS IN 2014 AND
2026
kg/day
Base On-road Emissions
Safety margin allocated to MVEB
Conformity MVEB
2014 NOX
2014 VOC
10,079
10,079
5,916
5,916
2026 NOX
2026 VOC
2,681
1,087
3,768
2,468
1,004
3,472
Includes the portion of Gaston and Lincoln counties in the maintenance area. Although Cleveland County is included in the MPO, it is not included in the Charlotte ozone maintenance area.
TABLE 3CHARLOTTE REGIONAL TRANSPORTATION PLANNING ORGANIZATION CRTPOROCKY RIVER RURAL
PLANNING ORGANIZATION RRRPO MVEBS IN 2014 AND 2026
kg/day
Base On-road Emissions
Safety margin allocated to MVEB
Conformity MVEB
2014 NOX
2014 VOC
32,679
32,679
18,038
18,038
2026 NOX
2026 VOC
8,870
3,371
12,241
khammond on DSKJM1Z7X2PROD with RULES
Includes all of Mecklenburg County and a portion of Iredell and Union Counties in the maintenance area.
The remaining safety margin after the allocation to the 2026 MVEBs is 63.31
tons per day tons/day and 13.73 tons/
day for NOX and VOC, respectively is provided below in Table 4.
1 A safety margin is the difference between the attainment level of emissions from all source
categories i.e., point, area, on-road, and nonroad
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and the projected level of emissions in the maintenance year from all source categories.
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8,655
3,288
11,943
