Section 28A.7 - Board of commissioners - appointment1. The authority established under this subchapter shall be governed by a board of commissioners appointed as provided in subsection 2. The appointment of the commissioners shall be made in writing and shall indicate the legal residence of the appointee.2. The board of commissioners of an authority shall consist of sixteen members, eight members of which shall be residents of the metropolitan area of each state which is a party to the authority. At least four but not more than five members appointed from each metropolitan area shall be elected city or county officers. The mayor of each city having a population of at least eighty thousand within the metropolitan area shall appoint, with the consent of the city council, four members to the board of commissioners. The mayor of each city having a population of at least forty thousand, but less than eighty thousand, within the metropolitan area shall appoint, with the consent of the city council, two members to the board of commissioners. The mayor of each city having a population of at least nineteen thousand, but less than forty thousand, within the metropolitan area shall appoint, with the consent of the city council, one member to the board of commissioners. The remaining members appointed from each state shall be appointed by the chairperson of the governing body of the county within the metropolitan area, with consent of the governing body, from cities having less than nineteen thousand population and areas outside the corporate limits of cities.3. If a city increases to a population that would enable an additional appointment to be made, a member appointed by the chairperson of the governing body of the county and having the least tenure shall be removed from the board of commissioners. If a city decreases to a population warranting fewer members, the appointee having the least tenure of that city shall be removed from the board of commissioners and the chairperson of the governing body of the county in which that city is located shall make a new appointment as provided in subsection 2. If more members than are required to be removed have the same tenure, the removal shall be determined by lot.4. The appointing authorities shall provide representation for racial groups residing in the metropolitan area based on the ratio of the racial population to the population as a whole.