S.C. Code Ann. § 44-2-120
(A) The department shall promulgate regulations relating to the evaluation and approval of site rehabilitation contractors to perform work pursuant to this chapter. In doing so, the department, where appropriate, may utilize or incorporate national or state licensing or certification programs that may assist in this endeavor. The department in these regulations may distinguish between different types of site rehabilitation contractors. The regulations promulgated pursuant to this section shall include the following requirements for site rehabilitation contractors:
(C) Nothing in this chapter may be construed to prohibit an owner or operator of an underground storage tank from conducting site rehabilitation or cleanup through contractors, subcontractors, or qualified personnel employed by them. However, the department may prohibit from participating in site rehabilitation under this chapter any contractor or subcontractor or person who: