As used in this part, unless the context otherwise requires:
"Prospective purchaser" means a prospective owner, operator, tenant, developer, lender, or any other party who would not otherwise be liable under section 128D-6, prior to a voluntary response action being conducted.
"Requesting party" means the person or persons submitting an application to conduct a voluntary response action.
"Voluntary response action" means a response conducted voluntarily by a requesting party.