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DOE outlines plans and timing for Building 4024 basement demolition at Etech
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Summary
DOE presented demolition planning for Building 4024's basement—about 35 feet deep—including a demolition work plan, mitigation and monitoring plans, data-gap investigations, and a target to begin demolition in late 2027 pending DTSC reviews and approvals.
DOE and contractor staff used the Connect meeting to brief attendees on preparations for demolishing the remaining basement at Building 4024 (the Systems for Nuclear Auxiliary Power test facility) in Area 4.
Luke Hill said all above-ground structures at Area 4 were removed in 2020–2021 and that DOE's next major step is to remove the subsurface basement at Building 4024. He described the building's basement as standing "approximately 35 feet below ground surface," and said DOE has developed a demolition work plan that details excavation approaches, soil and waste management, dust control, air monitoring and protection of biological and cultural resources.
Hill said DOE has also prepared supporting plans: a site mitigation and monitoring plan, waste management and transportation plans (including destination for disposal), a stormwater pollution prevention plan, and a data‑gap investigation work plan to inform decisions about bedrock depth, groundwater depth and soil/waste handling during demolition. He said DOE will work closely with DTSC on plan reviews and approvals and that preliminary field work to collect subsurface data is planned to better inform demolition approaches.
On schedule, Hill said, "We're tracking to, begin demolition of this basement in late 20 27." DOE emphasized the importance of site-specific air monitoring (upwind/downwind and perimeter stations) and other controls during demolition to protect workers and nearby communities.
Next steps: DOE will complete data-gap field work, finalize and obtain DTSC approvals of demolition and mitigation plans, and continue coordination on monitoring and waste-management procedures ahead of a late-2027 demolition target.
