Five members of the Authority shall constitute a quorum at any meeting of the Authority and the affirmative vote of 5 members shall be necessary for any action taken by the Authority at a meeting, except that the Authority may act by unanimous written consent if provided for in the by-laws of the Authority. No vacancy in the membership of the Authority shall impair the right of a quorum to exercise all the rights and perform all the duties of the Authority.
     The members of the Authority shall serve without compensation, but each member shall be reimbursed for his necessary expenses incurred in the discharge of his official duties.