S.C. Code Ann. 44-56-320
Liability: Discharge of Hazardous Material
An individual who, in good faith and without compensation, provides assistance or advice in an attempt to address or prevent a hazardous material release will not be held legally responsible. They can be held legally responsible if acting with extreme carelessness or intent to cause harm.
Attempts to mitigate effects of discharge; immunity
Any person who in good faith gratuitously provides assistance or advice in mitigating or attempting to mitigate the effects of an actual or threatened discharge of hazardous materials, or in preventing, cleaning up, or disposing of or in attempting to prevent, clean up, or dispose of any such discharge, is not subject to civil damages unless an injury or damages result from the gross negligence, recklessness, or intentional misconduct of such person.