§ 52.248. Identification of plan—conditional approval.

914 words·~4 min read·/us/cfr/t40/s§ 52.248·

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(a)The EPA is conditionally approving a California State Implementation Plan

(SIP)revision submitted on November 13, 2015 updating the motor vehicle emissions budgets for nitrogen oxides

(NOX)and coarse particulate matter

(PM10)for the 1987 24-hour PM10 standard for the San Joaquin Valley PM10 maintenance area. The conditional approval is based on a commitment from the State to submit a SIP revision that demonstrates full implementation of the contingency provisions of the 2007 PM10 Maintenance Plan and Request for Redesignation (September 20, 2007). If the State fails to meet its commitment by June 1, 2017, the approval is treated as a disapproval. (b)-(c) [Reserved] (d)(1) The EPA is conditionally approving portions of the California SIP revisions submitted on July 11, 2007 and September 9, 2015, demonstrating control measures in the Mojave Desert portion of the Los Angeles-San Bernardino Counties (West Mojave Desert) nonattainment area implement RACT for the 1997 and 2008 ozone standards. The conditional approval is based on a commitment from the state to submit new or revised rules that will correct deficiencies in the following rules for the Mojave Desert Air Quality Management District: (i)-(vii) [Reserved]

(viii)Rule 1160, Internal Combustion Engines; (ix)-(x) [Reserved]

(2)If the State fails to meet its commitment by January 31, 2019, the conditional approval is treated as a disapproval. (e)-(g) [Reserved]

(h)The EPA is conditionally approving the California State Implementation Plan

(SIP)for the South Coast for the 2008 ozone NAAQS with respect to the reasonable further progress

(RFP)contingency measure requirements of CAA sections 172(c)(9) and 182(c)(9). The conditional approval is based on a commitment from the South Coast Air Quality Management District (District) in a letter dated January 29, 2019, and clarified in a letter dated May 2, 2019, to adopt specific rule revisions, and a commitment from the California Air Resources Board

(CARB)dated February 13, 2019 to submit the amended District rule or rules to the EPA within 12 months of the effective date of the final conditional approval. If the District or CARB fail to meet their commitments within one year of the effective date of the final conditional approval, the conditional approval is treated as a disapproval. (i)-(k) [Reserved]

(l)The EPA is conditionally approving the California State Implementation Plan

(SIP)for Nevada County (Western part) for the 2008 ozone NAAQS with respect to the contingency measures requirements of CAA sections 172(c)(9) and 182(c)(9). The conditional approval is based on a commitment from the Northern Sierra Air Quality Management District (District) in a letter dated October 26, 2020, to adopt a specific rule revision, and a commitment from the California Air Resources Board

(CARB)dated November 16, 2020, to submit the amended District rule to the EPA within 12 months of the effective date of the final conditional approval. If the District or CARB fail to meet their commitments within one year of the effective date of the final conditional approval, the conditional approval is treated as a disapproval.

(m)The EPA is conditionally approving the California State Implementation Plan

(SIP)for Eastern Kern for the 2008 ozone NAAQS with respect to the contingency measures requirements of CAA sections 172(c)(9) and 182(c)(9). The conditional approval is based on a commitment from the Eastern Kern Air Pollution Control District (District) in a letter dated September 1, 2020, to adopt a specific rule revision or revisions, and a commitment from the California Air Resources Board

(CARB)dated September 18, 2020, to submit the amended District rule or rules to the EPA within 12 months of the final conditional approval. If the District or CARB fail to meet their commitments within one year of the final conditional approval, the conditional approval is treated as a disapproval.

(n)The EPA is conditionally approving the California State Implementation Plan

(SIP)for Mojave Desert for the 2008 ozone NAAQS, 2015 ozone NAAQS, and 1987 PM10 NAAQS with respect to the nonattainment New Source Review requirements of CAA section 173. The conditional approval is based on a commitment from the Mojave Desert Air Quality Management District (District) in a letter dated June 12, 2025, to adopt a specific rule revision, and a commitment from the California Air Resources Board

(CARB)dated June 17, 2025, to submit the amended District rule to the EPA within 12 months of the effective date of the final conditional approval. If the District or CARB fail to meet their commitments within one year of the effective date of the final conditional approval, the conditional approval is treated as a disapproval. [82 FR 46926, Oct. 10, 2017, as amended at 82 FR 57135, Dec. 4, 2017; 83 FR 5923, Feb. 12, 2018; 83 FR 23374, May 21, 2018; 83 FR 50010, Oct. 4, 2018; 83 FR 61552, Nov. 30, 2018; 84 FR 11207, Mar. 25, 2019; 84 FR 19682, May 3, 2019; 84 FR 31684, 31686, July 2, 2019; 84 FR 52015, Oct. 1, 2019; 85 FR 8185, Feb. 13, 2020; 85 FR 11814, Feb. 27, 2020; 85 FR 25295, May 1, 2020; 85 FR 38086, June 25, 2020; 85 FR 57729, Sept. 16, 2020; 85 FR 71269, Nov. 9, 2020; 86 FR 27532, May 21, 2021; 86 FR 33539, June 25, 2021; 86 FR 58593, Oct. 22, 2021; 87 FR 12869, Mar. 8, 2022; 87 FR 24063, Apr. 22, 2022; 87 FR 59692, Oct. 3, 2022; 88 FR 36251, June 2, 2023; 88 FR 39368, June 16, 2023; 88 FR 75236, Nov. 2, 2023; 91 FR 13777, Mar. 23, 2026]

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§ 52.248

Identification of plan—conditional approval.

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