For the purpose of this section, the term— (1) “oil” means oil of any kind or in any form, including, but not limited to, petroleum, fuel oil, sludge, oil refuse, and oil mixed with wastes other than dredged spoil...(d) National Contingency Plan (1) Preparation by President The President shall prepare and publish a National Contingency Plan for removal of oil and hazardous substances pursuant to this section....(2) Discharge posing substantial threat to public health or welfare (A) If a discharge, or a substantial threat of a discharge, of oil or a hazardous substance from a vessel, offshore facility, or onshore...