S.C. Code Ann. § 12-28-920
(A) The terminal operator of a terminal in this State is jointly and severally liable for the tax imposed under Section 12-28-310 and shall remit payment to this State upon discovery of either of the following conditions:
(1) The supplier with respect to the taxable motor fuel is a person other than the terminal operator and is not a licensed supplier. The terminal operator is relieved of liability if he establishes all of the following: