S.C. Code § 12-6-3550
2002 Act No. 280, Section 7, provides as follows:
"The incentives offered in this act apply only to projects receiving a certification of completion from the Department of Health and Environmental Control after the effective date of this act."
2008 Act No. 342, Section 3, provides as follows:
"This act takes effect upon approval by the Governor and applies to party voluntary cleanup contracts entered into pursuant to Section 44-56-750 on or after this act's effective date."