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DSAC members raise groundwater and PFAS monitoring questions; request hydrology review
Summary
Committee members and public commenters flagged potential problems with the landfill monitoring network, well construction and interpretation of leachate/PFAS data. DSAC asked staff to pursue a hydrologist briefing and to collect spatial context for groundwater results.
Disposal Site Advisory Committee members and public commenters raised questions about the validity of Coffin Butte monitoring wells, the design of the monitoring network and the interpretation of leachate and PFAS results.
DSAC member David Hoffman described anomalies in the monitoring data for “Well 26,” noting a hydrograph that does not show expected seasonal rise and fall and corresponding chemical data that remain essentially flat. Hoffman said the…
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