"You have evidence of pig-specific bacteria in surface waters, next to industrial swine operations," says Steve Wing, a researcher at the University of North Carolina.
Hanford workers described symptoms that include chronic headaches, respiratory problems and nerve damage.
Joseph Neff is an investigative reporter who joined The Raleigh News & Observer in 1992.
Neff is a graduate of Northwestern and Columbia universities.
Contact him at firstname.lastname@example.org or 919-829-4516