Exxon Corp. tentatively has agreed to pay about $1.2 billion to settle state and federal government civil claims stemming from the Exxon Valdez oil spill, a state official says.

Attorney General Charles Cole said Wednesday the settlement would be "in the ballpark" of $1.2 billion to restore natural resources in Prince William Sound and to pay for further scientific studies and cleanup.Nearly 11 million gallons of crude oil spilled when the tanker ran aground in March 1989. The nation's largest oil spill soiled 1,200 miles of coastline and killed thousands of birds, mammals and fish.