If the arbitral tribunal rules as a preliminary question that it has jurisdiction, any party shall request the superior court, within 30 days after having received notice of that ruling, to decide the matter or shall be deemed to have waived objection to such finding.
Source:
Section 1297.166, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=1297.166..