In pursuance of Article IV of said Compact, there shall be three members (hereinafter called commissioners) of the Ohio River Valley Water Sanitation Commission (hereinafter called Commission) from the State of Illinois. The Governor, by and with the advice and consent of the Senate, shall appoint two persons as two of such commissioners, each of which shall be a resident and citizen of the State of Illinois. The terms of one of the said two commissioners first appointed shall be three years and of the other shall be six years; and their successors shall be appointed by the Governor, by and with the advice and consent of the Senate, for terms of six years each. Each commissioner shall hold office until his successor shall be appointed and qualified. Vacancies occurring in the office of any such commissioner from any reason or cause shall be filled by appointment by the Governor, by and with the advice and consent of the Senate, for the unexpired term. The third commissioner from the State of Illinois shall be the Director of the Environmental Protection Agency, ex-officio, and the term of any such ex-officio commissioner shall terminate at the time he ceases to hold said office of Director of the Environmental Protection Agency, and his successor as a commissioner shall be his successor as said Director of the Environmental Protection Agency. With the exception of the issuance of any order under the provisions of Article IX of the Compact, said ex-officio commissioner may delegate, from time to time, to any deputy or other subordinate in his department or office the power to be present and participate, including voting, as his representative or substitute at any meeting of or hearing by or other proceeding of the Commission. The terms of each of the initial three members shall begin at the date of the appointment of the two appointive commissioners, provided the said Compact shall then have gone into effect in accordance with Article XI of the Compact; otherwise shall begin upon the date upon which said Compact shall become effective in accordance with said Article XI.
     Any Commissioner may be removed from office by the Governor upon charges and after a hearing, but opportunity to be heard shall be given.