Cal. Gov. Code § 22970.855

The board may permit a participant to withdraw some or all of his or her after-tax contributions without requiring the participant to terminate from the plan to the extent that this in-service distribution is allowed under applicable federal and state laws, and pursuant to the terms and conditions established by the board. A participant may apply for a distribution of amounts held in the participant’s separate rollover contribution account established pursuant to Section 22970.58 at any time before that participant’s termination of employment, to the extent that an in-service distribution is allowed under applicable federal and state law, and pursuant to the terms and conditions established by the board.