43 CFR 3809.431 - When must I modify my plan of operations?
You must modify your plan of operations when any of the following apply:
(c) Before final closure, to address impacts from unanticipated events or conditions or newly discovered circumstances or information, including the following:
(5) Plans for assuring the adequacy of containment structures and the integrity of closed waste units;
Title 43 published on 2013-10-01
no entries appear in the Federal Register after this date.