Dozens of workers in recent years have reported being sickened by chemical vapors while working near the tanks.
The Energy Department estimates it will cost $110 billion to finish environmental cleanup work at the Hanford nuclear reservation.
Attorney General Bob Ferguson's office made the announcement Wednesday. It comes in response to an independent report that suggests Hanford workers suffer adverse health effects from exposure to chemical vapors.
The KING 5 Investigators have obtained a draft report that paints a damning picture of worker safety protocols at the Hanford site.
The U.S. Department of Labor says Washington River Protection Solutions violated federal rules by firing the worker after she raised questions about safety. The company says her concerns over environmental issues did not play a role in her termination.
Hanford contractor Washington River Protection Solutions says five of the workers reported symptoms of vapor exposure, while the other was sent for evaluation as a precaution.
Hanford contractor Washington River Protection Solutions says the site's C Farm was evacuated as a precaution. The employees were cleared to return to work.
Hanford contractor Washington River Protection Solutions has asked Savannah River National Laboratory to examine vapor management and worker protection measures at the site.
The state sent a letter Wednesday to the U.S. Department of Justice asking to start a 40-day period of negotiations under the terms of a federal court agreement with the Department of Energy.
SEATTLE -- Exposure to potentially harmful chemical vapors sent 26 workers at the Hanford Site to a Richland hospital or an on-site medical clinic in the two-week period starting March 19.
The "Ranger in Your Pocket" website provides first-hand accounts of life at the Hanford site and includes room-by-room information on the B Reactor.
Washington River Protection Solutions says employees working at the site's A Farm Complex will wear the equipment while the company looks for the source of the chemical vapors.
Hanford contractor Washington River Protection Solutions says all the workers have been cleared by doctors. The company says it is taking steps to prevent employees from being exposed to chemical vapors.
The employees smelled a chemical odor and reported nose and throat irritation and headaches. All six were cleared to return to work.
Gov. Jay Inslee and Attorney General Bob Ferguson released a new plan for the Hanford Site
The U.S. Department of Energy has released its alternative to Gov. Jay Inslee and Attorney General Bob Ferguson's plan to clean up Hanford waste.
A total of 18 Hanford workers have been treated for exposure to chemical vapors in just the past eight days. It has many wondering if there's a new threat at the tank farm site.
Three employees of a Hanford contractor were given medical evaluations after being exposed to vapors in a tank farm. Workers had been evacuated from a farm Tuesday after several reported smelling chemical vapors.
Washington River Protection Solutions, a contractor at the Hanford site, says two of its employees were taken to a hospital after they complained of coughing and throat irritation.
The state's administrative order would require the federal government to begin pumping nuclear waste out of the leaking tank 18 months sooner than the Department of Energy proposed.
The Department of Energy says the Waste Sampling and Characterization Facility at the Hanford site will close within a year. According to DOE, using offsite labs to analyze waste samples will save around $12 million a year.
Gov. Jay Inslee and U.S. Energy Secretary Ernest Moniz met Monday morning to discuss the Department of Energy's draft cleanup plan, but Inslee released a statement saying the proposal fell short of what the state requested.
The group Hanford Challenge is criticizing the Department of Energy's plan to take at least two years to pump out the leaking nuclear waste storage tank at the site.
Officials say the nuclear waste is leaking between the walls of a double-walled storage tank. None of the waste is believed to have escaped into the nearby soil.
The Obama administration released its proposed Hanford cleanup budget for the 2015 fiscal year Tuesday - and it's a sizable cut. KEPR looked into how the decrease will affect the cleanup and the Tri-Cities' economy.
New documents show some newer nuclear waste storage tanks at the Hanford site could leak.
The U.S. Department of Energy says members of the public can register online beginning in March for public tours of Hanford cleanup sites and the B Reactor.
Donna Busche, who filed a complaint in 2011 about safety issues at Hanford, was fired Tuesday from her job at the nuclear site.