The Corps has a standing mission to provide engineering support in response to major disasters, such as the California earthquakes and Hurricane Andrew. When Mount St. Helens erupted in 1980, the effects on water quality and on the natural recovery of fish, wildlife and plant species were of primary concern in the Corps' response. After the Exxon Valdez ran aground, District dredges recovered nearly 400,000 gallons of oil from the waters of Alaska's Prince William Sound. Corps teams also were able to provide expert rehabilitation support to the people of the Philippines after the 1993 eruption of Mount Pinatubo.