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Cs-137 >10. pCi/g Hanford Site Waste Mgmt Area C 3D Model
Large plumes of contaminated groundwater are a consequence of Cold War plutonium production at the U.S. Department of Energy’s Hanford Site in eastern Washington. The plumes origin has been attributed primarily to the intentional release of radioactive waste to the soil rather than leaks from underground storage tanks. Ongoing degradation of groundwater quality underneath the 241-C single-shell tank farm in the 200 East Area has been occurring since the late 1990s. This long-term degradation of the groundwater underneath these storage tanks indicates the persistent migration of tank waste through the vadose zone to groundwater. The development of this new groundwater plume is particularly troubling as the travel time to the Columbia River has been estimated as short as 6 to 7 years. Data provided courtesy of Nez Perce Tribe, Environmental Restoration and Waste Management Program.