Defenses to liability

There shall be no liability under § 8-1442 for a person otherwise liable who can establish by a preponderance of the evidence that the costs resulting from their acts or omissions were caused solely by: (1) An act of God; (2) An act of War; (3) An act or omission of a third party other than an employee or agent of the defendant, or other than one whose act or omission occurs in connection with a contractual relationship, existing directly or indirectly, with the defendant, if the defendant establishes by a preponderance of the evidence that the defendant: (A) Exercised due care with respect to the hazardous substance concerned, taking into consideration the characteristics of such hazardous substance, in light of all relevant facts and circumstances; and (B) Took precautions against foreseeable acts or omissions of any such third party and the consequences that could foreseeably result from such acts or omissions; or (4) Any combination of the foregoing paragraphs.