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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Proposed Rules nonattainment area,24 and clarifications to emissions tables in the Plan.25

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B. Clean Air Act Procedural Requirements for Adoption and Submission of SIP Revisions CAA sections 110a and 110l require a state to provide reasonable public notice and opportunity for public hearing prior to the adoption and submission of a SIP or SIP revision. To meet this requirement, every SIP
submittal should include evidence that adequate public notice was given and an opportunity for a public hearing was provided consistent with the EPAs implementing regulations in 40 CFR
51.102.
Both the District and CARB have satisfied the applicable statutory and regulatory requirements for reasonable public notice and hearing prior to the adoption and submittal of the 2018
Western Nevada County Ozone Plan. On September 21, 2018, the District published a notice in the local newspaper of a public hearing to be held on October 22, 2018, for the adoption of the 2018 Western Nevada County Ozone Plan.26 The District adopted the Plan through Resolution 201807 at the October 22, 2018
hearing, and directed the Executive Director to forward the Plan to CARB for inclusion in the California SIP.27
CARB also provided public notice and opportunity for public comment on the 2018 Western Nevada County Ozone Plan. On October 12, 2018, CARB
released for public review its Staff Report for the Plan and published a notice of public meeting to be held on November 15, 2018, to consider adoption.28 At the November 15, 2018
hearing, CARB adopted the Plan as a revision to the California SIP, excluding those portions not required to be submitted to the EPA, and directed the Executive Officer to submit the Plan to the EPA for approval into the California SIP. On December 2, 2018, the Executive Officer of CARB submitted the Plan to the EPA, including the CARB Board resolution adopting the 24 Email dated May 14, 2020 from Earl Withycombe, CARB, to Khoi Nguyen, EPA Region 9, for attachment of the 2019 emission inventory for the nonattainment area.
25 Email dated August 17, 2020 from Webster Tasat, CARB, to Khoi Nguyen, EPA Region 9, for clarifications of the emission tables.
26 Affidavit of Publication from Nevada County Publishing Company including a copy of the proof of publication and of the September 21, 2018 notice for the October 22, 2018 public hearing.
27 See NSAQMD Resolution 201807, October 22, 2018.
28 Notice of Public Meeting to Consider the Ozone Attainment Plan for Western Nevada County, signed by Richard Corey, Executive Officer, CARB, October 12, 2018.

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2018 Western Nevada County Ozone Plan.29 On June 20, 2019, the EPA
determined that certain portions of this submittal applicable to the 2008 ozone NAAQS were complete.30
Based on information provided in the SIP revision summarized above, the EPA has determined that all hearings were properly noticed. Therefore, we find that the submittal of the 2018
Western Nevada County Ozone 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 2018 Western Nevada County Ozone Plan A. Emissions Inventories 1. Statutory and Regulatory Requirements CAA sections 172c3 and 182a1
require states to submit for each ozone nonattainment area a base year inventory that is a comprehensive, accurate, current inventory of actual emissions from all sources of the relevant pollutant or pollutants in the area. In addition, the 2008 Ozone SRR
requires that the inventory year be selected consistent with the baseline year for the RFP demonstration, which is the most recent calendar year for which a complete triennial inventory is required to be submitted to the EPA
under the Air Emissions Reporting Requirements.31
The EPA has issued guidance on the development of base year and future year emissions inventories for ozone and other pollutants.32 Emissions inventories for ozone must include 29 CARB

Resolution 1836.
dated June 20, 2019, from Elizabeth Adams, Director, Air and Radiation Division, EPA
Region IX, to Richard Corey, Executive Officer, CARB. The Plan was deemed complete by operation of law on June 2, 2019, 6 months after submittal, but the EPA completeness finding for the following SIP elements: Contingency measures for VOC and NOX; emissions statement; ozone attainment demonstration; and RFP demonstration for VOC
and NOX for moderate nonattainment areas was necessary to stop clocks for mandatory sanctions in the Western Nevada nonattainment area under section 179a of the CAA resulting from a December 11, 2017 finding of failure to submit. See 82 FR 58118.
31 2008 Ozone SRR at 40 CFR 51.1115a and the Air Emissions Reporting Requirements at 40 CFR
part 51, subpart A.
32 Emissions Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient Air Quality Standards NAAQS
and Regional Haze Regulations, EPA454/B17
002, May 2017. At the time the 2018 Western Nevada County Ozone Plan was developed, the following EPA emissions inventory guidance applied: Emissions Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient Air Quality Standards NAAQS
and Regional Haze Regulations, EPA454R05
001, August 2005.
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emissions of VOC and NOX and represent emissions for a typical ozone season weekday.33 States should include documentation explaining how the emissions data were calculated. In estimating mobile source emissions, states should use the latest emissions models and planning assumptions available at the time the SIP is developed.34
Future baseline emissions inventories must reflect the most recent population, employment, travel and congestion projections for the area. In this context, future 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 and that consider expected growth. Future baseline emissions inventories are necessary to show the projected effectiveness of SIP
control measures. Both the base year and future year inventories are necessary for photochemical modeling to demonstrate attainment.
2. Summary of States Submission The 2018 Western Nevada County Ozone Plan includes base year 2011
and future year 2012, 2014, 2017, 2020, and 2021 baseline inventories for NOX
and VOC for the Western Nevada County ozone nonattainment area.
Documentation for the inventories are found in Chapter IV, Emissions Inventory Background, Chapter V, Summary of Emissions Inventory Methodologies, Appendix A, Emissions Inventories for 2011, 2012, 2014, 2017, 2020 and 2021, and Appendix F, Modeling Emission Inventory for the 8-Hour Ozone State Implementation Plan in Western Nevada County Non-attainment Area WNNA.
The emissions inventories represent average summer day emissions, consistent with the observation that higher ozone levels in Western Nevada County typically occur from May through October. The 2011 base year and future year inventories in the 2018
Western Nevada County Ozone Plan reflect District rules and CARB
regulations submitted through November 2016.35 The mobile source portions of both base year and projected future year inventories were developed using Californias EPA-approved mobile source emissions model, EMFAC2014, 33 40 CFR 51.1115a and c, and 40 CFR
51.1100bb and cc.
34 80 FR 12264, at 12290 March 6, 2015.
35 Staff Report: CARB Review of the Ozone Attainment Plan for Western Nevada County, CARB, October 12, 2018, page 6 CARB Staff Report.

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