return the surface water quality at the abandoned hardrock mine site to the baseline conditions described in the permit, as determined by the Administrator, subparagraph (A) shall not apply to the Good Samaritan or any cooperating persons. (4) Unforeseen circumstances (A) In general The recipient of a Good Samaritan permit may seek to modify or terminate the Good Samaritan 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 Good Samaritan permit