In 1989, three government agencies reached a "Tri Party Agreement" and began work to clean up the Hanford site. In addition to the actual nuclear materials, all of the landscape around Hanford has been contaminated and must be remediated. Today, the nuclear waste is being turned into glass through a process called vitrification. The glass peices are then buried.  A still greater concern is how to prevent other buried matierlas from leaching through the rock and making their way to the river.