S.C. Code Ann. § 43-39-80

The commission shall establish procedures under which community agencies or organizations and representative groups of the poor which feel themselves inadequately represented on the commission may petition for adequate membership. In this regard, the commission shall be governed by the federal regulations and guidelines promulgated under Public Law 92-424 and Public Law 93-644. If the commission finds that a petition for membership is meritorious and a seat is warranted, they shall increase the membership of the commission as provided for in SECTION 43-39-30(b) and (c).