The Tri-City Herald reports the drums were among 74 on the truck that were being shipped from a treatment facility at Hanford to a plant just off Hanford.
CH2M Hill Plateau Remediation Co. says the truck was in an area where the public is not allowed. It stopped at a railroad crossing and the drums fell off. Radiological surveys showed that none of the drums broke.
The company was working Monday to determine what caused the drums to fall.
The treatment facility receives contaminated waste water from Hanford activities and the material in the drums was solid waste left from the water treatment.