Office of Environmental Management

EM Moves Major Step Closer to Completing Idaho Waste Exhumation Project

April 16, 2019

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Crews have completed targeted waste exhumation at the Accelerated Retrieval Project VIII facility at DOE’s Idaho National Laboratory Site. Just 0.69 acres of buried Cold War weapons waste at the site’s subsurface disposal area remains to be exhumed under
Crews have completed targeted waste exhumation at the Accelerated Retrieval Project VIII facility at DOE’s Idaho National Laboratory Site. Just 0.69 acres of buried Cold War weapons waste at the site’s subsurface disposal area remains to be exhumed under

IDAHO FALLS, Idaho EM crews recently finished exhuming radioactive and hazardous waste from a combined area of 5 acres at the Radioactive Waste Management Complex (RWMC) at DOE’s Idaho National Laboratory (INL) Site.

   The workers, with EM cleanup contractor Fluor Idaho, will now focus on removing the last 0.69 acres of targeted waste from the Cold War landfill.

   “With each buried waste exhumation project — eight to date — our crews have applied their waste management experience, as well as additional worker protection measures, to become even more efficient,” Fluor Idaho Manager Jason Chapple said.

   After exhuming the waste, the workers repackage and ship it to EM’s Waste Isolation Pilot Plant in New Mexico for permanent disposal.

   The waste was generated during nuclear weapons production at the former Rocky Flats Plant near Denver and was buried at the INL Site from 1954 to 1970.

   The most recent buried waste exhumation campaign took place in a 1.72-acre enclosure over two pits — the first areas used to dispose of the Rocky Flats waste beginning in the early 1950s. Using specially modified heavy equipment, crews took out radioactively contaminated filters and molds, solidified sludge containing radioactive and hazardous constituents, and a reactive uranium material called “roaster oxides.”

   Once the waste is removed from the final 0.69-acre area in the year ahead, the entire landfill will be covered with several feet of native gravel and soil as part of a cap to span more than 130 acres. The goal is to prevent the migration of precipitation through the remaining waste toward the underlying Snake River Plain Aquifer.

   Since 2005, crews have been digging up targeted transuranic and hazardous waste from specific areas of the RWMC’s 97-acre subsurface disposal area in compliance with agreements between the DOE, the State of Idaho, and the U.S. Environmental Protection Agency.

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