Energy Secretary Dan Brouillette announced a legal settlement on Monday between the Trump administration and South Carolina on the removal of 9.5 metric tons of weapons-grade plutonium from the state.

The agreement calls for the federal government to make an upfront payment of $600 million to resolve a long-running legal dispute over cleaning up radioactive material stored in South Carolina. In return, South Carolina agreed to hold off on bringing new lawsuits against the Energy Department for removal of the plutonium. South Carolina sued three years ago, seeking to force the agency to remove the plutonium or to pay hundreds of millions of dollars in fines.