On 8 August 2001, the 654-foot car/truck carrier M/V Tristan released a reported 12,000 gallons of Intermediate Fuel Oil 380 (IFO 380) into the marine environment off the Oregon coast. The release occurred when a fuel settling tank was overfilled, sending fuel oil through the tank vent and over the side of the vessel. At the time of the spill, the ship was heading north, approximately 30 to 40 miles off the central Oregon coast near Coos Bay, Oregon. The release began at 11:20 Pacific Daylight Time and continued until being discovered four hours later. Following the release, the Tristan continued north along the Oregon/Washington coast. The vessel was ordered by the U.S. Coast Guard (USCG) to make port in Port Angeles, Washington where the vessel was inspected and cleaned. The cause of the release was determined to be an inoperable overflow alarm system on the settling tank and human error.