Representatives of the Secretary, the Secretary of Commerce, the Secretary of the Interior, the Chairman of the Council on Environmental Quality, the Commandant of the Coast Guard and the Administrator of the Environmental Protection Agency shall be entitled to participate as observers in the deliberations of any Board established pursuant to subsection (a) of this section. The Federal Cochairman of the Appalachian Regional Commission or any regional commission under title V of the Public Works and Economic Development Act [
42 U.S.C. 3181 et seq.] shall be entitled to participate as an observer in the deliberations of any such Board which contains one or more States which are members of such Commission.