You must modify your plan of operations when any of the following apply:

1. (a) Before making any changes to the operations described in your approved plan of operations;
2. (b) When BLM requires you to do so to prevent unnecessary or undue degradation; and

3. (c) Before final closure, to address impacts from unanticipated events or conditions or newly discovered circumstances or information, including the following:

   1. (1) Development of acid or toxic drainage;
   2. (2) Loss of surface springs or water supplies;
   3. (3) The need for long-term water treatment and site maintenance;
   4. (4) Repair of reclamation failures;
   5. (5) Plans for assuring the adequacy of containment structures and the integrity of closed waste units;
   6. (6) Providing for post-closure management; and (7) Eliminating hazards to public safety.