Cal. Lab. Code § 143.2

The board, acting as a whole, may adopt, amend, or repeal rules of practice and procedure pertaining to hearings on applications for permanent variances, variance appeals, and other matters within its jurisdiction. All rules of practice and procedure amendments thereto, or repeal thereof, shall be made in accordance with the provisions of Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code.