California Code, Code of Civil Procedure - CCP § 1297.382

All applicable limitation periods including periods of prescription shall be tolled or extended upon the commencement of conciliation proceedings to conciliate a dispute under this title and all limitation periods shall remain tolled and periods of prescription extended as to all parties to the conciliation proceedings until the 10th day following the termination of conciliation proceedings. For purposes of this article, conciliation proceedings are deemed to have commenced as soon as (a) a party has requested conciliation of a particular dispute or disputes, and (b) the other party or parties agree to participate in the conciliation proceeding.