Each corporation shall be governed by a board of directors of nine or more members, selected as provided in this section. Each governing body which authorized the formation of the corporation shall appoint three members of the said board of directors; provided, that if the area to be served by the corporation shall be located wholly within an area governed by a single governing body, the said governing body shall appoint nine members to the said board; provided further, that if the said area to be served shall be located wholly within an area governed by at least two, but not more than two, governing bodies, or if the formation of the board was authorized by only two governing bodies, each of the said governing bodies shall be entitled to appoint at least five members of the said board, or such other number as may be provided by the certificate of incorporation or any amendment thereto. If there are more than 16 directors, they shall appoint from among their number an executive committee consisting of nine members, which shall have and exercise the powers and authority of the board of directors, subject to the general supervision and control of the said board. Every member of the board of directors must be a resident of the area which he or she represents and which is to be served by the proposed facilities. The terms of the initial members of the board appointed by the governing bodies, as provided above, shall begin immediately upon their appointments and shall end at noon on April 1 of the succeeding odd-numbered calendar years following the appointments as designated by said governing body at the time of their said appointments. Thereafter, the term of office of each director shall be six years. The terms of office of the said directors shall be arranged so that the terms of office of approximately one third of all directors will end at noon on April 1, in each odd-numbered calendar year. A member of the board of directors shall hold office until his or her successor has been appointed and qualified. The respective appointing authorities shall appoint or reappoint a qualified person as a member of the board of directors whenever a member's term expires or whenever a position becomes vacant for any other reason. A member of the board of directors shall receive no compensation for his or her services.