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County consultants report favorable PFAS risk results and successful installation of permeable reactive barrier at fire training site
Summary
Consultants reported that a newly installed permeable reactive barrier (Regenesis PlumeSTOP) at the county fire training facility reduced PFAS at pilot monitoring points to very low or nondetectable levels; investigation found multiple plumes including an off‑site 'mystery plume' and the team is awaiting DEP guidance on disposal‑site boundary before final Phase 2 conclusions.
Barnstable County officials heard a detailed technical briefing Nov. 19 on the multi‑year investigation and cleanup work at the county fire training facility. Paul Rosala, assets manager for Barnstable County, introduced consultants from GZA GeoEnvironmental (John Pacman and Jennifer McKechnie) and subcontractor GHD, who reviewed field work, ecological and human health screenings, and a newly installed permeable reactive barrier.
John Pacman, principal hydrogeologist with GZA, said the team installed 16 additional multilevel monitoring wells and a broad sampling program that included more than 80 wells in May. That work clarified groundwater flow (about 1–1.5 feet per day in highly permeable Cape Cod sands) and defined a primary plume extending southeast toward the Mary Dunn supply wells. The team also identified a separate off‑site “mystery plume” whose source is not yet determined.
GZA and GHD described their ecological and…
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