S.C. Code Ann. § 6-16-90

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 members. The executive committee may exercise such powers during intervals between the board's meetings as provided by the board. The terms of office of the members of the executive committee and the method of filling vacancies shall be fixed by the bylaws of the joint agency.