Cal. Gov. Code § 31628
If the service of a member is discontinued other than by death or retirement, upon proper application submitted to the retirement board, they shall be paid all of their accumulated contributions, in accordance with this chapter, minus a withdrawal charge, if a withdrawal charge has been provided for by the regulations of the board. The board may order payment in whole or in part withheld for a period not to exceed six months after date of separation. If a member does not file the proper application, the board shall send to the member, not more than 90 days after termination of service, at their last known address, a registered or certified letter stating that they have money to their credit on the books of the retirement system and that if they do not claim the money within 10 years after date of notice, in the case of persons first employed before January 1, 1976, or within five years in the case of persons first employed on and after January 1, 1976, the money will be deposited in and become a part of the current pension reserve fund.
Ca. Gov. Code § 31628