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Federal Register / Vol. 86, No. 25 / Tuesday, February 9, 2021 / Proposed Rules
order to verify the areas attainment status. In the February 27, 2020
submittal, PADEP commits to continue to operate their air monitoring network in accordance with 40 CFR part 58.
PADEP also commits to track the attainment status of the Clearfield/
Indiana Area for the 1997 ozone NAAQS through the review of air quality and emissions data during the second maintenance period. This includes an annual evaluation of vehicles miles traveled and stationary source emissions data compared to the assumptions included in the LMP.
PADEP also states that it will evaluate the periodic i.e., every three years emission inventories prepared under EPAs Air Emission Reporting Requirements 40 CFR part 51, subpart A. Based on these evaluations, PADEP
will consider whether any further emission control measures should be implemented for the Clearfield/Indiana Area. EPA has analyzed the commitments in PADEPs submittal and is proposing to determine that they meet the requirements for continued air quality monitoring and verification of continued attainment.
D. Contingency Plan The contingency plan provisions are designed to promptly correct or prevent a violation of the NAAQS that might occur after redesignation of an area to attainment. Section 175A of the CAA
requires that a maintenance plan include such contingency measures as
EPA deems necessary to assure that the state will promptly correct a violation of the NAAQS that occurs after redesignation. The maintenance plan should identify the contingency measures to be adopted, a schedule and procedure for adoption and implementation of the contingency measures, and a time limit for action by the state. The state should also identify specific indicators to be used to determine when the contingency measures need to be adopted and implemented. The maintenance plan must require that the state will implement all pollution control measures that were contained in the SIP
before redesignation of the area to attainment. See section 175Ad of the CAA.
PADEPs February 27, 2020 submittal includes a contingency plan for the Clearfield/Indiana Area. In the event that the fourth highest eight-hour ozone concentration at a monitor in the Clearfield/Indiana Area exceeds 0.084
ppm for two consecutive years, but prior to an actual violation of the NAAQS, PADEP will evaluate whether additional local emission control measures should be implemented that may prevent a violation of the NAAQS.16 After analyzing the conditions causing the excessive ozone levels, evaluating the effectiveness of potential corrective measures, and considering the potential effects of Federal, state, and local measures that have been adopted but
not yet implemented, PADEP will begin the process of implementing selected measures so that they can be implemented as expeditiously as practicable following a violation of the NAAQS. In the event of a violation, PADEP commits to adopting additional emission reduction measures as expeditiously as practicable in accordance with the schedule included in the contingency plan as well as the CAA and applicable Pennsylvania statutory requirements.
PADEP will use the following criteria when considering additional emission reduction measures to adopt to address a violation of the 1997 ozone NAAQS in the Clearfield/Indiana Area: 1 Air quality analysis indicating the nature of the violation, including the cause, location, and source; 2 emission reduction potential, including extent to which emission generating sources occur in the nonattainment area; 3
timeliness of implementation in terms of the potential to return the area to attainment as expeditiously as practicable; and 4 costs, equity, and cost-effectiveness. The measures PADEP
would consider pursuing for adoption in the Clearfield/Indiana Area include, but are not limited to, those summarized in Table 3 of this document. If additional emission reductions are necessary, PADEP commits to adopt additional emission reduction measures to attain and maintain the 1997 ozone NAAQS.

TABLE 3CLEARFIELD/INDIANA AREA SECOND MAINTENANCE PLAN CONTINGENCY MEASURES

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Non-Regulatory Measures:
Voluntary diesel engine chip reflash installation software to correct the defeat device option on certain heavy-duty diesel engines.
Diesel retrofit including replacement, repowering or alternative fuel use for public or private local onroad or offroad fleets.
Idling reduction technology for Class 2 yard locomotives.
Idling reduction technologies or strategies for truck stops, warehouses, and other freight-handling facilities.
Accelerated turnover of lawn and garden equipment, especially commercial equipment, including promotion of electric equipment.
Additional promotion of alternative fuel e.g., biodiesel for home heating and agricultural use.
Regulatory Measures: 17
Additional control on consumer products.18
Additional controls on portable fuel containers.19

The contingency plan includes schedules for the adoption and implementation of both non-regulatory and regulatory contingency measures,
including schedules for adopting potential land use planning strategies not listed in Table 3 of this document,
which are summarized in Tables 4 and 5 of this document, respectively.

16 A violation of the NAAQS occurs when an areas 3-year design value exceeds the NAAQS.
17 These regulatory measures were considered potential cost-effective and timely control strategies by the Ozone Transport Commission OTC as well as the Mid-Atlantic Regional Air Management Association and the Mid-Atlantic/Northeast Visibility Union. The OTC is a multi-state organization responsible for developing regional solutions to ground-level ozone pollution in the Northeast and Mid-Atlantic, including the
development of model rules that member states may adopt. The OTC member states include:
Connecticut, Delaware, the District of Columbia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, and Virginia. For more information on the OTC, visit https otcair.org/index.asp. To view the model rules developed by the OTC, including those for consumer products and portable fuel containers, visit https otcair.org/
document.asp?fview=modelrules.

18 Pennsylvanias existing controls on consumer products are under 25 Pa. Code Chapter 130, Subchapters B and C 38 Pa.B. 5598. This contingency measure includes the adoption of additional controls on consumer products such as VOC limits for adhesive removers.
19 Existing controls on portable fuel containers can be found under 40 CFR part 59, subpart F
Control of Evaporative Emissions From New and InUse Portable Fuel Containers.

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