coughing, sore throats, expectorating, dizziness and nausea... Several of these workers have long-term disabilities." Doctors checked workers and cleared them to return to work. Monitors worn by tank workers have found no samples with chemicals close to the federal limit for occupational exposure. In August 2014 OSHA ordered the facility to rehire a contractor and pay $220,000 in back wages for firing the employee for whistleblowing on safety concerns at the site. On November 19, 2014, the attorney general of Washington, Bob Ferguson, said the state planned to sue the DOE and its contractor to protect workers from hazardous vapors at Hanford. A 2014 report by the DOE Savannah River National Laboratory initiated by 'Washington River Protection Solutions' found that DOE's methods to study vapor releases were inadequate, particularly, that they did not account for short but intense vapor releases. They recommended "proactively sampling the air inside tanks to determine its chemical makeup; accelerating new practices to prevent worker exposures; and modifying medical evaluations to reflect how workers are exposed to vapors". Cleanup under Superfund Organization Decades of manufacturing left behind of high-level radioactive waste stored within 177 storage tanks, an additional of solid radioactive waste, and areas of heavy technetium-99 and uranium-contaminated groundwater beneath three tank farms on the site as well as the potential for future groundwater contamination beneath currently contaminated soils. On June 25, 1988, the Hanford Site was divided into four areas and proposed for inclusion on the National Priorities List. On May 15, 1989, the Washington Department of Ecology, the United States Environmental Protection Agency (EPA), and the DOE entered into the Tri-Party Agreement, which provides a legal framework for environmental remediation at Hanford. By 2014 the agencies were engaged in the world's largest environmental cleanup, with many challenges to be resolved in the face of overlapping technical, political, regulatory, and cultural interests. The cleanup effort was focused on three outcomes: restoring the Columbia River corridor for other uses, converting the central plateau to long-term waste treatment and storage, and preparing for the future. In 2011 DOE, the federal agency charged with overseeing the site, "interim stabilized" 149 single-shell tanks by pumping nearly all the liquid waste out into 28 newer double-shell tanks. Solids, known as salt cake and sludge, remained. The DOE later found water intruding into at least 14 single-shell tanks and that one of them had been leaking about per year into