An agreement under this section may contain a covenant not to sue under section 9607(a)(4)(C) of this title for damages to natural resources under the trusteeship of the United States resulting from the release or threatened release of hazardous substances that is the subject of the agreement, but only if the Federal natural resource trustee has agreed in writing to such covenant. The Federal natural resource trustee may agree to such covenant if the potentially responsible party agrees to undertake appropriate actions necessary to protect and restore the natural resources damaged by such release or threatened release of hazardous substances.
42 U.S.C. § 9622(j)(2); see In re Acushnet, 712 F. Supp. at 103233.