S.C. Code Ann. § 6-23-80

The board of directors of a joint agency may create an executive committee the composition of which shall be set forth in the bylaws of the joint agency. The composition of the executive committee shall afford a fair representation of the member municipalities. The executive committee shall have and shall exercise such of the powers and authority of the board of directors during the intervals between the board's meetings in accordance with the board's bylaws, rules, motions or resolutions. The terms of office of the members of the executive committee and the method of filling vacancies therein shall be fixed by the bylaws of the joint agency.