The membership of the Board of Review shall consist of five (5) residents of the City of Marinette none of whom occupy any public office in the City of Marinette municipal government or who are publicly employed by the City of Marinette; said members to be appointed by the Mayor subject to the confirmation of the City Council. Three (3) members shall have concurrent two (2) year terms and two (2) members shall have concurrent three (3) year terms. In addition to the five regular members, the Mayor shall appoint, subject to confirmation by the City Council, an alternate member for a term of three years who shall act with full power when a regular member refuses or is unable to vote on any given matter. The board shall carefully examine the roll or rolls and correct all apparent errors in description or computation, and shall add all omitted property. The board shall not raise or lower the assessment of any property except after hearing.