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Groundwater, PFAS and methane monitoring emerge as central concerns in Coffin Butte discussion
Summary
Republic Services and Benton County staff reviewed groundwater monitoring, PFAS, and methane control at Coffin Butte Landfill on July 31 and agreed to provide DSAC members with long-term monitoring reports and targeted appendices.
Republic Services and Benton County staff spent a substantial portion of the July 31 DSAC meeting reviewing the landfill’s environmental monitoring program and responding to questions about groundwater, PFAS and methane emissions.
Republic staff said Coffin Butte conducts semiannual groundwater monitoring at a network of approximately 35 wells and performs required leachate and underdrain sampling; they told DSAC that the most recent monitoring rounds showed results “below drinking water standards” for the parameters DEQ requires. Company presenters noted historic elevated arsenic in certain wells and described those measurements as stable and consistent with regional background levels rather than a new contaminant plume.
The committee and company discussed PFAS…
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