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Federal Register / Vol. 86, No. 5 / Friday, January 8, 2021 / Proposed Rules
for evaluation under section 110k and other applicable substantive requirements. To meet this procedural requirement, a state must include evidence that it provided adequate public notice and an opportunity for a public hearing, consistent with the EPAs implementing regulations in 40
CFR 51.102.
The Arizona Department of Environmental Quality ADEQ
provided public notice and opportunity for public comment on the West Pinal County PM10 Plan. On October 19, 2015, ADEQ released the West Pinal County PM10 Plan for public review and published a notice of public meeting to be held on November 19, 2015, to consider adoption of the West Pinal County PM10 Plan.10 On November 19, 2015, ADEQ held the public hearing and subsequently adopted the West Pinal County PM10 Plan as a revision to the Arizona SIP.11 Under authority provided by Arizona state law, on December 21, 2015, Eric Massey, Director of the Air Quality Division, ADEQ, submitted the West Pinal County PM10 Plan to the EPA.12 On June 21, 2016, the West Pinal County PM10 Plan became complete by operation of law.13
Based on information provided in the SIP submissions summarized above, the EPA has determined that the public hearing was properly noticed.
Therefore, we find that the submittal of the West Pinal County PM10 Plan meets the procedural requirements for public notice and hearing in CAA sections 110a and 110l and 40 CFR 51.102.
III. Evaluation of the West Pinal County PM10 Plan A. Emissions Inventories
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1. Statutory and Regulatory Requirements CAA section 172c3 requires a state to submit for each PM10 nonattainment area a base year inventory that is a comprehensive, accurate, current 10 Arizona Department of Environmental Quality and Public Comment Period and Hearing on the Proposed Arizona State Implementation Plan Revision, Attainment Plan for the West Pinal County PM10 Planning Area 1987 NAAQS
published in the Arizona Republic October 19 and 20, 2015; Exhibit EIII, Appendix E, West Pinal County PM10 Plan.
11 Public Hearing Presiding Officer Certification signed by Naveen Savarirvayan, Presiding Officer, November 19, 2015 and notarized; Exhibit EVI, Appendix E, West Pinal County PM10 Plan. The hearing transcript and the public comments and State responses are found at Exhibit EVIII and Exhibit EVII, respectively, within Appendix E, West Pinal County PM10 Plan.
12 Letter dated December 21, 2015 from Eric C.
Massey, Director, Air Quality Division, ADEQ to Jared Blumenfeld, Regional Administrator, EPA
Region IX.
13 42 U.S.C. 7410k1B.

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inventory of actual emissions from all sources of the relevant pollutant or pollutants in the area. Also, the state should submit a second projected attainment year inventory for the year in which the state projects that the area will attain the PM10 standards. The state should include documentation explaining how it calculated the emissions data. When estimating mobile source emissions, states should use the latest emissions models and planning assumptions available at the time the SIP is developed.14
The state must meet several general requirements for base year emissions inventories, consistent with CAA
section 172c3. First, the emissions inventory year must be one of the 3
years used for the EPA PM10
nonattainment designation for the area, or an alternative year agreed upon by the EPA and the state as more reflective of the causes and sources of violations of the PM10 standard that meet the criteria in CAA section 172c3.
Second, the state must reflect actual emissions from all sources of PM10 in the inventory. Third, the state should report the emissions inventory in the form of the PM10 standard it is intended to address, e.g., in tons or pounds per day to be consistent with the averaging period of the 24-hour PM10 NAAQS.15
A state must meet similar CAA
section 172c3 requirements in the projected attainment year inventory for the most expeditious year in which the state can show attainment of the PM10
standard in the modeled attainment demonstration portion of the nonattainment plan. At a minimum, the state must choose an attainment year consistent with the outermost applicable deadline required by CAA
section 188c. As with the baseline year inventory, the state must reflect emissions from all sources of PM10 in this inventory and report them in the form of the PM10 standard. In addition, the attainment year inventory must be consistent with the source categories and level of detail reported by the state in the base year inventory.
Future attainment year and related baseline emissions inventories must reflect the most recent population, employment, travel and congestion estimates for the area. In this context, baseline emissions inventories refer to emissions estimates for a given year and area that reflect rules and regulations and other measures that are already adopted in a states EPA
approved SIP and assumed within the attainment demonstration. Future 14 See 15 See
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baseline emissions inventories are necessary to show the projected effectiveness of SIP control measures designed to result in attainment by the applicable attainment year. Both the base year and future year, baseline and attainment inventories are necessary inputs to any modeling or other analyses required to demonstrate attainment of the PM10 standard, as required by section 189a1B.
2. Summary of States Submission The West Pinal County PM10 Plan includes a base year 2008 inventory, and future year 2018 baseline and attainment emissions inventories for direct PM10 in the West Pinal County area. The State provided documentation for the emissions inventories in Chapter 5 Annual Emissions Inventory of the West Pinal County PM10 Plan and its two-part Appendix B Pinal County PM10 Nonattainment Area Emissions Inventories for 2008 and 2018 Base Years and Design Days, and its supporting Exhibits.16 The emissions inventories are provided in two parts, one representing windblown PM10
emissions on high-wind days including both entrained dust and windblown dust from human activities, and the second representing PM10 emissions on low-wind days including dust due to human activity that stagnates near its point of origin. The State presents the annual emissions inventories on a tons per year basis that it later converts to a tons or pounds per day basis for use within the attainment demonstration modeling for the 24-hour NAAQS at issue.
The 2018 attainment year emissions inventories reflect State of Arizona and Pinal County rules adopted concurrently with the West Pinal County PM10 Plan in late 2015.17 The Plans emissions reductions are based on continuing implementation of existing Federal controls along with new state and local control measures submitted with the Plan. The 2008 base year and projected 2018 baseline and attainment year inventories use the most recent EPA-approved mobile source emissions model at the time the plan was developed, MOVES2014, for estimating on-road motor vehicle emissions.18 Future emissions forecasts in the West Pinal County PM10 Plan, particularly on-road mobile source emissions, are based primarily on 16 As needed, we will refer to the primary document as Appendix B and the secondary document as Appendix B-Exhibits.
17 Please refer to Appendices G, H, and I, West Pinal County PM10 Plan for rule adoption information.
18 Appendix B, 62.

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