Contractors are working to remove the double liner system that was used for the dewatering operation and performing site restoration work.
The work is expected to be mostly completed this month, though site inspections will continue until a vegetative cover has been established on the land.
Last year, polychlorinated biphenyls, or PCBs, were detected in some of the stockpiled sediment samples dredged from the Mill River and stored on the site until it was removed to a licensed disposal facility.
Federal and state regulators reviewed and approved a months-long updated management and disposal plan. At the time of the PCB detection, First Selectman Michael Tetreau and Conservation Director Brian Carey said there was no risk to the public.
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