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§ 51.492 State program election and submittal.
(a) Extreme O3nonattainment areas. (1) A State or authorized governing body for any extreme O3 nonattainment area shall submit a plan revision to implement an EIP, in accordance with the requirements of this part, pursuant to section 182(g)(5) of the Act, if:
(i) A required milestone compliance demonstration is not submitted within the required period.
(ii) The Administrator determines that the area has not met any applicable milestone.
(2) The plan revision in paragraph (a)(1) of this section shall be submitted within 9 months after such failure or determination, and shall be sufficient, in combination with other elements of the SIP, to achieve the next milestone.