; and (iv) in certain circumstances, as determined by the Secretary, the preservation of eligible land. (B) Inclusions The term compensatory mitigation includes— (i) on-site permittee-responsible mitigation; (ii) off-site permittee-responsible mitigation; and (iii) in-leu fee mitigation. (5) Contaminated land The term contaminated land means land, including ANCSA land and Indian land, contaminated by— (A) petroleum; (B) a petroleum-based product; (C) a hazardous substance (as is defined in section 101 of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 ( 42 U.S.C. 9601 )); or (D) any other pollutant or contaminant (as is defined in section 101 of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 ( 42 U.S.C. 9601 )). (6) Credit (A) In general The term credit means a unit of measure (such as a functional or areal measure or other suitable metric) that represents the accrual or attainment of the functions associated with the restoration, establishment, enhancement, or preservation of resources at a compensatory mitigation site, with no change in the size of the area of the compensatory mitigation site. (B) Generating mitigation credit Remediation of contaminated sites is an appropriate means of generating mitigation credit when the removal of hazardous substances, pollutants, or contaminants restores or enhances aquatic resource functions on ANCSA land or Indian land. (7) Indian The term Indian has the meaning given the term in section 4 of the Indian Self Determination and Education Assistance Act ( 25 U.S.C. 5304 ). (8) Indian land The term Indian land means land that— (A) is held in trust by the United States for an Indian Tribe