In the absence of the chairman at any meeting, the vice chairman shall preside. In the event of the inability of the chairman to perform the functions of his office, such functions shall be performed by the vice chairman with the same force and effect as the performance of such functions by the chairman.
Source:
Section 101122, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=101122..