Department of Energy
A long road to remediation for hexavalent chromium plume near Los Alamos
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In the years between 1956 and 1972, thousands of kilograms of chemical called hexavalent chromium was released into a canyon near Los Alamos. Some of the contaminant filtered through the soils of the area and was consequently converted to trivalent chromium, a far less dangerous iteration of the chemical. But at least 2,000 kg of hexavalent chromium has remained in the environment, moving through the canyonlands that surround Los Alamos for decades. Today, the contamination is settled atop an aquifer in a plume, and the chemical is now present within the first 100 feet of the water table in the area of the plume. The Department of Energy (DOE) and the New Mexico Environment Department (NMED) have been working to contain the plume since 2005, while officials decide on how best to clean up the contamination.