California Code, Public Utilities Code - PUC § 99156

Notwithstanding any other provision of law, a transit district may provide compensation to a member of the governing board of the district only for attendance at a meeting of the board or for each day the member is engaged in other district business within or without the district.  A member who engages in district business other than attendance at board meetings shall first obtain authorization of the board for reimbursement of travel expenses or other compensation before engaging in that business and shall submit a report thereof to the board for all expenditures.