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Staff and consultants say expansion will use modern liners and sentinel well monitoring; groundwater concerns and PFAS remain focal points for commissioners
Summary
Hydrogeologists told the planning commission the proposed expansion will use a composite liner and added leachate controls; the applicant agreed to pre‑development hydrogeologic study and installation of sentinel wells for routine monitoring.
Hydrogeology, groundwater and leachate chemistry were recurring technical concerns in public testimony and at the hearing. New testimony from the project’s hydrogeologic and environmental consultants outlined the following points: the proposed expansion would use a modern composite liner system with leachate collection; a focused hydrogeologic investigation and a network of sentinel wells (sentry wells) will be installed before development of the expansion area; and routine semiannual groundwater monitoring and reporting are proposed to detect any change in groundwater quality.
Consultant John Howard (Geologic Associates) told the commission there is no documented leachate release to groundwater from the lined portions of the site in the last 30 years…
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