The Board of Adjustment shall consist of 7 members who shall be residents of New Castle County who shall have knowledge of, and experience in, the problems of urban and rural development, and who, at the time of appointment, shall not be candidates or candidates-elect for, or incumbents of, elective public office. The County Executive, with the advice and consent of the County Council, shall appoint 6 members for terms of 4 years. The County Executive, with the advice and consent of the County Council, shall appoint 1 member who shall be chairperson and who shall serve at the pleasure of the County Executive. The compensation of the members of the Board of Adjustment shall be determined by the County Council.