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Town presentation links Toms Way well impacts to at least two distinct PFAS signatures
Summary
Nantucket consultants reported 'fingerprints' indicating at least two distinct PFAS sources near Toms Way. MassDEP monitoring found an exceedance at a Fairgrounds monitoring well; consultants said contaminants vary over short distances and urged private well testing.
At its Oct. 16 meeting the Nantucket Board of Health received a preliminary conceptual site-model update for the Toms Way area showing multiple PFAS "fingerprints" that suggest more than one source of contamination in a compact area.
Andrew Shapiro, the town's environmental contamination administrator, presented a summary of consultant TRC's fingerprinting analysis and characterized Toms Way as "an area that has been highly impacted by PFAS contamination," with several exceedances of the state standard (20 parts per trillion) and several conditions MassDEP and town staff consider imminent hazards.
TRC compared the mix of PFAS compounds in wells and found a pattern: the northern end of Toms Way and the nearby town well showed a signature dominated by PFHxS and related six-carbon…
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