This Subpart sets forth the procedures that apply when a complaint is filed with the Board that seeks, under the Act or the Groundwater Protection Act [415 ILCS 55 ], to require any person to perform a response that results from a release or substantial threat of a release of regulated substances or pesticides, or to recover the costs of a response. This Subpart also sets forth the burden and standard of proof for such actions.
Ill. Admin. Code tit. 35, § 741.200