water quality at the abandoned mine site to the baseline conditions described in subsection (c)(6), subparagraph (A) shall not apply to the Good Samaritan or any cooperating persons. (4) Unforeseen circumstances (A) In general The recipient of a covered permit may seek to modify or terminate the covered permit to take into account any event or condition that— (i) significantly reduces the feasibility or significantly increases the cost of completing the remediation project that is the subject of the covered permit