New England 4 February 21, 2017

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THE NEW ENGLAND EDITION

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It took subcontractors three years to remove the contaminated radioactive materials from the site, a former nuclear research and depleted uranium weapons facility.

By Irwin rapoport

CEG CORRESPONDENT

A key phase of the clean up of Starmet Corporation, a superfund site in Concord, Mass., was recently completed by de maximis inc. The main work was finished last August — under budget by $15 million. It took subcontractors three years to remove the contaminated radioactive materials from the site, a former nuclear research and depleted uranium weapons facility. The buildings were demolished over a five-month period. This work involved: • removal of the plastic membrane installed to cover the foundations of the buildings to prevent further migration of radioactive materials • removal of the foundations and underlying contaminated soil and sediment with an estimated volume of 82,500 cu. yds. (63,076 cu m); • containment and stabilization of a former disposal pit; • treatment of depleted and natural uranium in groundwater; • treatment of volatile organic compounds and dioxane in groundwater; and • long-term monitoring and institutional controls. This $55 million demolition project required specialized

work and safety precautions. The site included a two-story, five-section interconnected building; a hydrogen peroxide tank house; two gas cylinder storage huts; and four metal storage buildings, which had a combined footprint of approximately 185,000-sq.-ft. (17,187 sq m). In 1958, the site — an off-shoot of the Manhattan Project — had contracts with the United States Atomic Energy Commission and Department of Defense, along with some private industry contracts. These operations included the investigation and development of materials for missiles, airframes and other components. “We took out materials that filled a total of 912 32-cubicyard inter-modals totaling 11,738 tons that were shipped off site for land disposal at U.S. Ecology Idaho,” said Bruce Thompson, director of de maximis. “The building structure volume consisted of 7,494.8 tons and that was transported off site in 479 inter-modal containers during Phase 3 demolition activities.” Stan Baker, de maximis’s site construction manager, said that the mix of contaminants, which included DU, beryllium, PCBs and asbestos, mandated both body coverings and respiratory protection. When inside, workers used reciprocating sawzaws with metal blades for the internal demolition. The sawzaws were see EQuIPMENt page 6


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