Membership of Board and terms of office. The Board shall be composed of one member of the governing body, whose appointment shall be for one year; a member of the Planning Board, whose appointment shall be for three years or the duration of the term on the Planning Board, whichever terminates first; and three additional residents of the Borough, whose terms shall be for three years each, except that when the Board is initially appointed, one resident member shall be appointed for one year, one member for two years and the third member for three years. Appointments to fill vacancies resulting from resignations or removal from office shall be for the departing member's unexpired term.