In preparation for building demolition, the rooftop systems are being dismantled and removed as shown here on the northwest side of Building D. The mechanical exhaust unit has been sprayed with lock down agent on the exterior and interior of the unit and the intake and exhaust have been sealed. The unit has also been wrapped in plastic wrap in preparation of its removal.
EPA is working on an Action Memorandum for another Non-Time-Critical Removal Action (NTCRA), which will address 1, 4-dioxane in groundwater. EPA, MassDEP, and Respondents have been working together to identify the key elements for the design of the NTCRA for 1,4-dioxane in groundwater, which generally includes further delineation of the extent of 1,4-dioxane above regulatory limits in overburden and bedrock groundwater, performance of an “aquifer pump test” in order to obtain necessary hydrogeologic data for system design (e.g., locations and pumping rates for extraction wells to capture the 1,4-dioxane plume), and performance of one or more treatability studies to evaluate potentially applicable technologies to remove 1,4-dioxane from the extracted groundwater. Further delineation is likely to occur later this spring, before the Action Memorandum is issued.
Due to weather complications, schedule issues, and container availability, the scheduled off-site shipping campaign moved from April to early May. As shown in the above photo, interior walls and material are staged for disposal.
Interior building demolition is essentially complete with the removal of the non-structural walls. Initiating HEPA vacuuming of the surfaces to remove dust and adding an application of “lock down agent” to further control dust. Anticipate building demolition to begin Summer 2015. For more progress photos, see NTCRA Progress.
Work resumes in the previously closed buildings as the snow and ice thaws and Spring approaches Concord. The site is gearing up for the next shipping campaign, due to start in early April 2015.
Approximately 4 feet of snow, more in some areas, covers the rooftops in Buildings A, B, and C. In the interest of worker safety, work is suspended in these areas pending rooftop snow removal. The contamination reduction zone has been moved to Building D and work will continue in Building D and E. See NTCRA Progress for more snow photos.
High Hazard Work continued during December 2014 and January 2015. Decontamination and clean-out progressed, especially in the former Hydrofluoric Acid area as shown. To see more photos of progress, go to NTCRA Progress.
The Public Hearing on the Proposed Remedial Action Plan for the Nuclear Metals, Inc. Superfund Site will be at 6:30 pm on Wednesday, December 10, 2014, also at the Concord Town Hall Meeting Room, 22 Monument Square, Concord, MA.
Last updated on December 19, 2014