Cal. Code Regs. tit. 2 § 599.4
Any member of the part of a divided retirement system composed of positions of members not desiring coverage with respect to which a resolution has been filed in accordance with this article may file a written request with the Board of Administration that his position be transferred to the part of the system composed of members desiring coverage. Such request shall be on a form devised for the purpose and approved by the executive officer; provided, however, that the executive officer shall accept the filing of any writing signed by the member which clearly states his intention to transfer. A member's request for transfer must be received in the office of the board on or before the date specified in the resolution for such filing. Requests duly filed with the board shall be maintained as a permanent record. The executive officer shall provide the agency with the names of the persons requesting transfer.
Cal. Code Regs. Tit. 2, § 599.4