All local board members shall be appointed for terms of three years. If a vacancy occurs on a local board, the executive director of the office shall appoint another person to serve the unexpired portion of the term. Appointments to fill vacancies on the local board shall be made in the same manner and subject to the same conditions as the initial appointments to such board. The term of each member shall expire on the second Monday in July of the appropriate year. Members shall continue to serve until a successor is appointed.