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Federal Register / Vol. 86, No. 183 / Friday, September 24, 2021 / Proposed Rules
Under the PM2.5 SIP Requirements Rule, each attainment plan submission for an area designated nonattainment for the 1997 PM2.5 NAAQS before January 15, 2015, must contain quantitative milestones to be achieved no later than three years after December 31, 2014, and every three years thereafter until the milestone date that falls within three years after the applicable attainment date.198 If the area fails to attain, this post-attainment date milestone provides the EPA with the tools necessary to monitor the areas continued progress toward attainment while the state develops a new attainment plan.199
Quantitative milestones must provide for objective evaluation of RFP toward timely attainment of the PM2.5 NAAQS
in the area and include, at minimum, a metric for tracking progress achieved in implementing SIP control measures, including BACM and BACT, by each milestone date.200
Because the EPA designated the San Joaquin Valley area as nonattainment for the 1997 24-hour PM2.5 NAAQS
effective April 5, 2005,201 the plan for this area must contain quantitative milestones to be achieved no later than three years after December 31, 2014 i.e., by December 31, 2017, and every three years thereafter until the milestone date that falls within three years after the applicable attainment date.202 For a Serious area attainment plan with a statutory attainment date of December 31, 2015, the relevant quantitative milestone year is December 31, 2017.
However, as discussed in section III, the area did not attain by the statutory Serious area attainment date and evaluating reasonable further progress toward that date does not make sense.
We are therefore evaluating the Serious area obligations based on the attainment date the State must meet in a plan required under CAA section 189d.203
To meet CAA section 189d, the SJV
PM2.5 Plan includes a demonstration that the area will attain by December 31, 2020. Therefore, in accordance with 40
CFR 51.1013a4, the attainment plan for this area must contain quantitative related SIP submissions. Although this final rule did not affect any action that the EPA had previously taken under CAA section 110k on a SIP
for a PM2.5 nonattainment area, the EPA noted that states may need to submit additional SIP elements to fully comply with the applicable requirements of subpart 4, even for areas with previously approved PM2.5 attainment plans, and that the deadline for any such additional plan submissions was December 31, 2014. Id. at 31569.
198 40 CFR 51.1013a4.
199 81 FR 58010, 58064.
200 Id. at 58064 and 58092.
201 70 FR 944.
202 40 CFR 51.1013a4.
203 See CAA section 179d; 40 CFR 51.1004a3.

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H2 in Appendix H contains an anticipated implementation schedule for District regulatory control measures and Table 48 in Chapter 4 of the 2018
2. Summary of the States Submission PM2.5 Plan contains an anticipated Appendix H RFP, Quantitative implementation schedule for CARB
Milestones, and Contingency of the control measures in the San Joaquin 2018 PM2.5 Plan contains the States RFP Valley. Table H5 in Appendix H
demonstration and quantitative contains projected emissions for each milestones for the 1997 24-hour PM2.5
quantitative milestone year. These NAAQS,204 and the Valley State SIP
emissions levels reflect baseline Strategy contains the control measure emissions projections through the 2023
commitments that CARB has identified post-attainment milestone year.208
The SJV PM2.5 Plan identifies as mobile source quantitative milestones emissions reductions needed for for the 2020 milestone date.205 Given attainment of the 1997 24-hour PM2.5
the States conclusions that ammonia, NAAQS by 2020,209 and identifies San SOX, and VOC emissions do not Joaquin Valleys progress toward contribute significantly to PM2.5 levels attainment in each milestone year.210
that exceed the 1997 24-hour PM2.5
The State and District set RFP targets for NAAQS in the San Joaquin Valley, as each of the quantitative milestone years discussed in section IV.B of this as shown in Table H8 of Appendix H
proposed rule, the RFP demonstration of the 2018 PM2.5 Plan.
provided by the State addresses According to the Plan, reductions in emissions of direct PM2.5 and NOX.206
both direct PM2.5 and NOX emissions Similarly, the State developed from 2013 base year levels result in quantitative milestones based upon emissions levels consistent with implementation of control strategy attainment in the 2020 attainment year.
measures in the adopted SIP and in the Based on these analyses, the State and SJV PM2.5 Plan that achieve reductions in emissions of direct PM2.5 and NOX.207 District conclude that the adopted For the 1997 24-hour PM2.5 NAAQS, the control strategy is adequate to meet the RFP requirement for the 1997 24-hour RFP analysis in the Plan shows PM2.5 NAAQS.
generally linear progress toward attainment.
Quantitative Milestones We describe the RFP analysis and Appendix H of the 2018 PM2.5 Plan quantitative milestones in the SJV PM2.5
identifies the milestone dates of Plan in greater detail below.
December 31, 2017, December 31, 2020, Reasonable Further Progress and December 31, 2023, for the 1997
PM2.5 NAAQS.211 Appendix H also The State addresses the RFP and identifies target emissions levels to meet quantitative milestone requirements in the RFP requirement for direct PM2.5
Appendix H to the 2018 PM2.5 Plan and NOX emissions for each of these submitted in February 2020. The State milestone years,212 and State and estimates that emissions of direct PM2.5
District control measures that will and NOX will generally decline from the achieve emissions reductions in the 2013 base year to the projected 2020
attainment year, and beyond to the 2023 years leading up to each of the milestones, in accordance with the post-attainment quantitative milestone control strategy in the Plan.213
year. The Plans emissions inventory The Plan includes quantitative shows that direct PM2.5 and NOX are milestones for mobile, stationary, and emitted by a large number and range of sources in the San Joaquin Valley. Table area sources. For mobile sources, CARB
has developed quantitative milestones that provide for an evaluation of RFP
204 As discussed in footnote 34, all references to based on the implementation of specific Appendix H in this proposed rule are to the revised control measures by the relevant threeversion submitted on February 11, 2020, which replaces the version submitted with the 2018 PM2.5
year milestones. For each quantitative Plan on May 10, 2019.
milestone year, the Plan provides for 205 Valley State SIP Strategy, Table 7 identifying evaluating RFP by tracking State and State measures scheduled for action between 2017
District implementation of regulatory and 2020, inter alia and CARB Resolution 1849, San Joaquin Valley Supplement to the 2016 State measures and SIP commitments during Strategy for the State Implementation Plan the three-year period leading to each milestones to be achieved no later than December 31, 2017, December 31, 2020, and December 31, 2023.

October 25, 2018, 5 adopting State commitment to begin public processes and propose for Board consideration the list of proposed SIP measures outlined in the Valley State SIP Strategy and included in Attachment A, according to the schedule set forth therein.
206 SJV PM
2.5 Plan, Appendix H, H1.
207 Id. at H18 and H19 District milestones and H21 and H22 State milestones.

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208 Id.

at tables H3 to H5.
at Table H6.
210 Id. at Table H7.
211 Id. at Table H12.
212 Id. at Table H8.
213 Id. at H18 and H19 District milestones and H21 and H22 State milestones.
209 Id.

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