"State peace officer/firefighter member" also means:
Any person so designated may elect, within 90 days of notification by the board, to remain subject to the service retirement benefit and the normal rate of contribution applicable prior to the effective date that this section is applicable to the member by filing an irrevocable notice of election with the board. A member who so elects shall be subject to the reduced benefit factors specified in Section 21353 or 21354.1, as applicable, only for service also included in the federal system.
Ca. Gov. Code § 20393