10/02/2026
A hexavalent chromium plume on Pueblo de San Ildefonso land, originating from past operations at the U.S. Department of Energy’s Los Alamos National Laboratory, is the focus of an ongoing cleanup effort. Hexavalent chromium is classified as a known human carcinogen.
A state-directed operational halt has paused an interim measure meant to address the plume. But the legacy cleanup contractor continues technical work at the site.
N3B is working toward a transition from the Finite Element Heat and Mass Transfer Code (FEHM), a system developed at LANL, to MODFLOW, a U.S. Geological Survey computer program more widely used to simulate groundwater flow. The shift could help inform questions about plume movement and the effectiveness of future cleanup strategies.
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LOS ALAMOS, N.M. — The U.S. Department of Energy’s Environmental Management Los Alamos Field Office (EM-LA) says it is continuing technical work on the