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State officials say Saint-Gobain demolition nearly complete; testing planned for concrete pad and runoff
Summary
New Hampshire DES officials reported the demolition of the Saint-Gobain Performance Plastics Merrimack facility is nearly finished and that the company will test the remaining concrete pad and runoff for PFAS using EPA LEAF methods; DES said some regulatory limits prevent the agency from forcing removal of the pad.
Saint-Gobain Performance Plastics has finished most demolition work at its Merrimack facility and will carry out tests of the former building pad and runoff, New Hampshire Department of Environmental Services (DES) staff told the legislative PFAS commission on July 11, 2025. DES project manager Andy Fuller said the company “completed all their manufacturing operations, removed all equipment from the facility in 2024,” and that as of July 2 the demolition was “nearly a 100% complete.” Fuller told commissioners the company has removed materials from the property and disposed of them, and that remaining work includes decommissioning a transformer and a short stretch of sanitary sewer in the railroad right-of-way. Why it matters: commissioners said the condition of the concrete pad and any leaching from it could affect soil and groundwater in the broader consent-decree area around…
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