Washington River Protection Solutions has identified two possible sources of chemical vapors that sickened 18 workers in the last two weeks at the Hanford cleanup site.
All were cleared to return to work. Four had been sent to off-site medical facilities for symptoms that included headaches, coughing, burning eyes and dizziness, KEPR and the Tri-City Herald reported. Hanford's tank farms where they were working contain Cold-War-era nuclear and chemical wastes, but no radiological health hazards were reported.
In statements issued to Washington media outlets, WRPS said Thursday that the fumes are believed to originate from a pump pit with damaged insulation and liquid in unused equipment. Both potential sources have been isolated. WRPS reported that levels of vapors at work sites have been kept within occupational limits. The contractor has briefed workers and encouraged the use of respirators as needed.