S.C. Code Ann. § 11-15-240: Holding of sinking fund investments.

Such investments shall be kept separate and distinct and properly earmarked with or registered in the name of the particular sinking fund to which they are applicable and shall be used for no other purpose and kept until such time before the maturity of the bonds for which the sinking fund is established as it may be necessary to sell or collect them in order to meet such obligations at maturity.