; and (B) by inserting , with respect to contaminants on such land prior to the date on which the land is conveyed before the period. 420. Prohibition (a) In general The Secretary of the department in which the Coast Guard is operating shall not establish anchorage grounds on the Hudson River between Yonkers, New York, and Kingston, New York, under section 7 of the Rivers and Harbors Appropriations Act of 1915 ( 33 U.S.C. 471 ) or chapter 700 of title 46, United States Code, in addition to any anchorage grounds in effect in such area on the date of the enactment of this Act. (b) Restriction The Commandant may not establish or expand any anchorages, outside of the reach on the Hudson River described in subsection (a) without first providing notice to the Committee on Transportation and Infrastructure of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate not later than 180 days prior to the establishment or expansion of any such anchorages. 421. Certificate extensions Subchapter I of chapter 121 of title 46, United States Code, is amended by adding at the end the following new section: 12108. Authority to extend the duration of vessel certificates (a) Certificates Provided a vessel is in compliance with inspection requirements in section 3313, the Secretary of the Department in which in the Coast Guard is operating may, if he makes the determination described in subsection (b), extend for a period of not more than one year an expiring–— (1) certificate of documentation issued for a vessel under Chapter 121