S.C. Code Ann. § 44-2-70

(A) At the time the federal government mandates financial responsibility for underground storage tank owners or operators, the owner or operator of an underground storage tank containing petroleum or petroleum products shall maintain financial responsibility in the lesser amount of that required by the federal government or in the amount of twenty-five thousand dollars for site rehabilitation and for compensating third parties for property damage and bodily injury arising from the operation of petroleum underground storage tanks per occurrence with an annual aggregate of twenty-five thousand dollars. Financial responsibility requirements may be maintained through insurance, guarantee, surety bond, letter of credit, self-insurance, risk retention group, or any other method satisfactory to the department. No insurance policy, guarantee, surety bond, or any other financial responsibility mechanism which is executed to provide this or additional amounts of coverage shall contain any terms, endorsements, conditions, provisions, or other language that requires expenditures of funds from the Superb Account or the Superb Financial Responsibility Fund prior to or in lieu of payment by the mechanism, and no such financial responsibility mechanism which has previously been executed shall operate so as to require the expenditure of funds from the Superb Account or Superb Financial Responsibility Fund until funds provided by the financial responsibility mechanisms have been exhausted. The owner or operator shall demonstrate evidence of financial responsibility to the department. (B) The department shall promulgate regulations specifying requirements for maintaining evidence of financial responsibility, consistent with the provisions of this chapter, for taking corrective action and compensating third parties for bodily injury and property damage caused by accidental releases arising from operating an underground storage tank. The funds established in Section 44-2-40, for the purposes of these regulations, are acceptable mechanisms for maintaining this financial responsibility by owners and operators of underground storage tanks above twenty-five thousand dollars. (C) The funds established in Section 44-2-40, combined with the financial responsibility required by this section, may be used by owners and operators of underground storage tanks to demonstrate their compliance with any financial responsibility requirements promulgated under federal regulation.