The board of supervisors of the county may, by ordinance, establish a hospital authority separate and apart from the county for the purpose of effecting a transfer of the management, administration, and control of General Hospital and the Family Care Centers. The records of the hospital authority, whether paper records, records maintained in the management information system, or records in any other form that relate to trade secrets or to payment rates or the determination thereof, or which relate to contract negotiations with providers of health care, shall not be subject to disclosure pursuant to the California Public Records Act .