Cal. Government Code § 3505.8

An arbitration agreement contained in a memorandum of understanding entered into under this chapter shall be enforceable in an action brought pursuant to Title 9 (commencing with Section 1280) of Part 3 of the Code of Civil Procedure. An assertion that the arbitration claim is untimely or otherwise barred because the party seeking arbitration has failed to satisfy the procedural prerequisites to arbitration shall not be a basis for refusing to submit the dispute to arbitration. All procedural defenses shall be presented to the arbitrator for resolution. A court shall not refuse to order arbitration because a party to the memorandum of understanding contends that the conduct in question arguably constitutes an unfair practice subject to the jurisdiction of the board. If a party to a memorandum of understanding files an unfair practice charge based on such conduct, the board shall place the charge in abeyance if the dispute is subject to final and binding arbitration pursuant to the memorandum of understanding, and shall dismiss the charge at the conclusion of the arbitration process unless the charging party demonstrates that the settlement or arbitration award is repugnant to the purposes of this chapter.