GOV §3509.5: (a) Any charging party, respondent, or intervenor aggrieved by a final decision or order of the board in an unfair practice case, except a decision of the board not to issue a complaint in such a case

(a) Any charging party, respondent, or intervenor aggrieved by a final decision or order of the board in an unfair practice case, except a decision of the board not to issue a complaint in such a case, and any party to a final decision or order of the board in a unit determination, representation, recognition, or election matter that is not brought as an unfair practice case, may petition for a writ of extraordinary relief from that decision or order. A board order directing an election may not be stayed pending judicial review. (b) A petition for a writ of extraordinary relief shall be filed in the district court of appeal having jurisdiction over the county where the events giving rise to the decision or order occurred. The petition shall be filed within 30 days from the date of the issuance of the board’s final decision or order, or order denying reconsideration, as applicable. Upon the filing of the petition, the court shall cause notice to be served upon the board and thereafter shall have jurisdiction of the proceeding. The board shall file in the court the record of the proceeding, certified by the board, within 10 days after the clerk’s notice unless that time is extended by the court for good cause shown. The court shall have jurisdiction to grant any temporary relief or restraining order it deems just and proper, and in like manner to make and enter a decree enforcing, modifying, and enforcing as modified, or setting aside in whole or in part the decision or order of the board. The findings of the board with respect to questions of fact, including ultimate facts, if supported by substantial evidence on the record considered as a whole, shall be conclusive. Title 1 (commencing with Section 1067) of Part 3 of the Code of Civil Procedure relating to writs shall, except where specifically superseded by this section, apply to proceedings pursuant to this section. (c) If the time to petition for extraordinary relief from a board decision or order has expired, the board may seek enforcement of any final decision or order in a district court of appeal or superior court having jurisdiction over the county where the events giving rise to the decision or order occurred. The board shall respond within 10 days to any inquiry from a party to the action as to why the board has not sought court enforcement of the final decision or order. If the response does not indicate that there has been compliance with the board’s final decision or order, the board shall seek enforcement of the final decision or order upon the request of the party. The board shall file in the court the record of the proceeding, certified by the board, and appropriate evidence disclosing the failure to comply with the decision or order. If, after hearing, the court determines that the order was issued pursuant to the procedures established by the board and that the person or entity refuses to comply with the order, the court shall enforce the order by writ of mandamus or other proper process. The court may not review the merits of the order.