S.C. Code Ann. § 49-9-20

Unless the company shall receive written requests for the disposition of the remains of deceased relatives within the time stated in such notice, the company shall be at liberty to proceed with the creation of its proposed pond, lake or reservoir and to remove, if it deems it advisable, the bodies buried within the area together with any stones or markers to some suitable place nearby or to allow the bodies to remain within the area to be covered by water and the relatives of all persons buried within such area who fail to express in writing their wishes for the disposition of such bodies shall be deemed to have abandoned such graves.