Nontank vessels subject to this subpart may not—

1. (a) Operate upon the navigable waters of the United States unless in compliance with a vessel response plan (VRP) approved under § 155.5065.

2. (b) Continue to operate on the navigable waters of the United States if—

   1. (1) The Coast Guard determines that the response resources identified in the vessel's certification statement do not meet the requirements of this subpart;
   2. (2) The contracts or agreements required in §§ 155.5050 and 155.5052 and the vessel's certification statement are no longer valid;
   3. (3) The vessel is not operating in compliance with the submitted VRP; or
   4. (4) The period of the VRP authorization has expired.