Exxon Valdez punitive damages to the Supreme Court which capped the damages to US $507.5 million in June, 2008. On August 27, 2008, Exxon Mobil agreed to pay 75% of the US $507.5 million damages ruling to settle the 1989 "Exxon Valdez" oil spill off Alaska. In June 2009, a federal ruling ordered Exxon to pay an additional US$480 million in interest on their delayed punitive damage awards. After repairs, "Exxon Valdez" was renamed "Exxon Mediterranean", then "SeaRiver Mediterranean" in the early 1990s, when Exxon transferred their shipping business to a new subsidiary company, River Maritime Inc. The name was later shortened
Exxon Valdez oil spill effectively a bill of attainder, a regulation that was unfairly directed at Exxon alone. In 2002, the 9th Circuit Court of Appeals ruled against Exxon. As of 2002, OPA had prevented 18 ships from entering Prince William Sound. OPA also set a schedule for the gradual phase in of a double hull design, providing an additional layer between the oil tanks and the ocean. While a double hull would likely not have prevented the "Valdez" disaster, a Coast Guard study estimated that it would have cut the amount of oil spilled by 60 percent. The "Exxon Valdez" supertanker was towed