S.C. Code Ann. § 6-21-300

The governing body, when practicable, shall require that the proceeds of the sale of bonds issued under the provisions of this chapter be deposited in a special account or accounts in a bank or banks which are members of the Federal Reserve System and shall require, in so far as practicable, that each such deposit be secured by United States Government securities having an aggregate market value at least equal to the sum at the time on deposit or, in any event, the proceeds shall be deposited in some bank or other depository, either within or without the State, which will secure such deposit satisfactorily to the governing body.