S.C. Code Ann. § 48-57-70

A party asserting the privilege provided for in Section 48-57-30 has the burden of proving that the materials claimed as privileged constitute an environmental audit report as defined by Section 48-57-20 and also of proving that compliance has been achieved or will be achieved through the exercise of best efforts. A party seeking disclosure under Section 48-57-50 has the burden of proving the condition for disclosure set forth in that section.