Cal. Gov. Code § 3505.7
After any applicable mediation and factfinding procedures have been exhausted, but no earlier than 15 days after the factfinders' written findings of fact and recommended terms of settlement have been submitted to the parties pursuant to Section 3505.5, a public agency that is not required to proceed to interest arbitration may, after holding a public hearing regarding the impasse, implement its last, best, and final offer, but shall not implement a memorandum of understanding. The unilateral implementation of a public agency's last, best, and final offer shall not deprive a recognized employee organization of the right each year to meet and confer on matters within the scope of representation, whether or not those matters are included in the unilateral implementation, prior to the adoption by the public agency of its annual budget, or as otherwise required by law.
Ca. Gov. Code § 3505.7