S.C. Code Ann. § 43-41-80

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 on the commission. In this regard, the commission must be governed by the federal regulations and guidelines promulgated under federal law. If the commission finds that a petition for membership is meritorious and a seat is warranted, it shall increase the membership of the commission as provided for in Section 43-41-30(B) and (C).