Appointment And Membership. A Board of Adjustment is hereby established. The word "Board," when used in this Section, shall mean the Board of Adjustment. The Board of Adjustment shall consist of five (5) members, who shall be residents of the City, appointed by the Mayor and approved by Council. The term of office of the members of the Board shall be for five (5) years, except that the five (5) members first (1st) appointed shall serve respectively for the terms of one (1) year, two (2) years, three (3) years, four (4) years, and five (5) years each. Three (3) alternate members to the Board shall be appointed by the Mayor and approved by Council to serve in the absence or disqualification of any of the regular members. The term of office of the alternate members shall be for three (3) years, except that the first three (3) alternate members shall be for one (1) year, two (2) years, and three (3) years respectively. Vacancies shall be filled for the unexpired term of any member or alternate whose term becomes vacant. All members and alternates shall be removable for cause by the Mayor and Council for non-performance of duty, misconduct in office, or other cause upon written charges and after public hearing.