2020—Subsec. (a)(1)(B). Puspan. L. 116–260 substituted “September 30, 2031” for “September 30, 2023”.

1996—Subsec. (a). Puspan. L. 104–259 amended subsec. (a) generally. Prior to amendment, subsec. (a) read as follows: “The authority of the Secretary to perform remedial action under this subchapter shall terminate on September 30, 1996, except that the authority of the Secretary to perform groundwater restoration activities under this subchapter is without limitation.”

1992—Subsec. (a). Puspan. L. 102–486 substituted “1996” for “1994”.

1988—Subsec. (a). Puspan. L. 100–616 amended subsec. (a) generally. Prior to amendment, subsec. (a) read as follows: “The authority of the Secretary to perform remedial action under this subchapter shall terminate on the date seven years after the date of promulgation by the Administrator of general standards applicable to such remedial action unless such termination date is specifically extended by an Act of Congress enacted after November 8, 1978.”