California Code, Health and Safety Code - HSC § 25543.2

(1) Where reasonably possible, notify the unified program agency in writing of the stationary source's intent to modify the facility at least five calendar days before implementing any modifications. As part of the notification process, the stationary source shall consult with the unified program agency when determining whether the RMP should be reviewed and revised. Where prenotification is not reasonably possible, the stationary source shall provide written notice to the unified program agency no later than 48 hours following the modification.

(2) Establish procedures to manage the proposed modification, which shall be substantially similar to the procedures specified in Section 1910.119 of Title 29 of the Code of Federal Regulations pertaining to process safety management, and notify the unified program agency that the procedures have been established.