The U.S. Coast Guard issued a Notice stating that on February 12, 2002, the U.S. Embassy in London deposited a declaration with IMO stating that the express approval of the U.S. Government will be necessary before the revised Regulation 13G of MARPOL 73/78 would enter into force for the United States. In this declaration, the U.S. Government cited specific technical differences between the revised MARPOL Regulation for new and existing tankers and OPA 90.
Source: HK Law