Cal. Gov. Code § 9141

The committee shall consist of eight Members of the Senate and eight Members of the Assembly who shall be selected in the manner provided for in the Joint Rules of the Senate and Assembly. The committee shall elect its own chairperson. Vacancies occurring in the membership of the committee shall be filled in the manner provided for in the Joint Rules of the Senate and Assembly. A vacancy shall be deemed to exist as to any member of the committee whose term is expiring whenever the member is not reelected at the general election.