The members of the authority shall not be entitled to compensation for their services but may be reimbursed by the authority for their actual expenses properly incurred in the performance of their duties. The authority shall make rules and regulations for its own government and may retain, employ, and engage all necessary staff and personnel, including professional and technical supervisors, assistants, and experts and other agents and employees, whether temporary or permanent, as it may require. Any one or more of such persons so engaged may be designated as an additional assistant secretary-treasurer of the authority and may be given the duties of keeping the books, records, and minutes of the authority, of giving all notices required by Code Sections 46-3-120, 46-3-121, and 46-3-123, and, in the absence of or in lieu of the secretary-treasurer, performing all other functions of the secretary-treasurer. Officers designated by the authority pursuant to this Code section shall serve at the pleasure of the authority.