Nontank vessels subject to this subpart may not -
(a) Operate upon the navigable waters of the United States unless in compliance with a vessel response plan (VRP) approved under § 155.5065.
(b) Continue to operate on the navigable waters of the United States if -
(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(2) The contracts or agreements required in §§ 155.5050 and 155.5052 and the vessel's certification statement are no longer valid;
(3) The vessel is not operating in compliance with the submitted VRP; or
(4) The period of the VRP authorization has expired.