Cal. Government Code § 31511.11

(a) The board of supervisors of any county subject to this article shall establish a defined contribution retirement plan authorized by Section 401 of the Internal Revenue Code of 1954 or a similar plan authorized by the Internal Revenue Code of 1954. (b) Any full-time employee of the county who is hired by the county on or after the operative date of this article in that county and has completed 6 months of credited full-time service with the county or any member who elects to transfer to the retirement plan created by this article shall participate in the plan. (c) The county shall partially or fully match the contributions of the employee on the basis mutually agreed to by the board of supervisors and the employee representatives. (d) The right of the employee to benefits derived from employee contributions vests upon the commencement of the participation by the employee in the plan. (e) The right of the employee to benefits derived from matching employer contributions vests 100 percent after five years of full-time service with the county. (f) Upon termination of the employment of an employee whose benefits derived from employer contributions are not vested, benefits derived from the contributions of the employee shall be refunded to the employee and the matching contributions of the employer shall be credited to reduce future employer contributions or to pay expenses of the plan. (g) The defined contribution plan shall accept rollover contributions from other plans to the extent authorized by federal law. (h) The plan shall be administered in accordance with subdivision (k) of Section 401 of the United States Code.