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Permeable reactive barrier sharply reduces PFAS levels at former municipal fire training site, officials say
Summary
Consultants and Barnstable County reported that a permeable reactive barrier (PRB) installed July–October 2025 at the former Municipal Fire Training Site produced large early declines in PFAS concentrations in downgradient monitoring wells; officials said monitoring will continue and reinjection may be required as the barrier’s absorptive capacity is finite.
A permeable reactive barrier (PRB) installed at the former Municipal Fire Training Site in Hyannis has produced large early reductions in PFAS concentrations in downgradient monitoring wells, Barnstable County and its consultant GZA reported at a public update.
Dan Scanlon, senior project manager for GZA, said the PRB injection work (conducted July–October 2025) used a colloidal activated carbon product described in presentation materials as “PlumeStop” and that GZA installed 27 performance‑validation monitoring wells downgradient of the barrier. "Pre-injection PFAS‑6 concentrations were upwards of 9,000 parts per trillion," Scanlon said, and he added that…
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