Cal. Gov. Code § 31894.3

The board of supervisors shall, by resolution, certify to the Board of Administration of the Public Employees’ Retirement System that the provisions of Section 31894.2 have been complied with. In the event that the board of supervisors cannot certify compliance with the provisions of Section 31894.2, the board of supervisors shall cancel their notice of intent to withdraw from social security at least 30 days prior to the effective date of termination of coverage under the federal system.