California Code, Public Resources Code - PRC § 29735.1

(a) A member of the commission described in subdivision (a) of Section 29735 may, subject to the confirmation of his or her appointing power, appoint an alternate to represent him or her at a commission meeting. An alternate may serve prior to confirmation for a period not to exceed 90 days from the date of appointment, unless and until confirmation is denied.

(b) The alternate shall serve at the pleasure of the member who appoints him or her and shall have all of the powers and duties of a member of the commission, except that the alternate shall only participate and vote in a meeting in the absence of the member who appoints him or her. All provisions of law relating to conflicts of interest that are applicable to a member shall apply to an alternate.If a member has, or is known to have, a conflict of interest on any matter, the member's alternate is ineligible to vote on that matter.