Cal. Code Regs. tit. 2 § 598.64
The local division officer shall, upon issuance of the authorization, prepare a notice of the division which shall contain among other matters the date of the division and an explanation of the modification if any to be made in the retirement system as it applies to public agency employees. He shall submit such notice together with the proposed plan of procedure to the state division supervisor for approval. The approved notice shall be given not less than 90 days prior to the date set for the division to all persons who are eligible members of the system. Such notice shall also be given to each person who becomes an eligible member after the notice date to and including the date fixed for the division. Notice shall be given by personal delivery or by first-class mail and must be posted on all bulletin boards maintained by the agency to give notices to employees.
Cal. Code Regs. Tit. 2, § 598.64