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County: split groundwater sampling at Bonko View Lake landfill shows PFBA below health value but vinyl chloride above intervention limits in one well
Summary
Sherburne County reported split groundwater sampling at Vanko 1 (Bonko View Lake landfill): PFBA was detected in all wells but below Minnesota Department of Health health‑based values; vinyl chloride results in one well have been above intervention limits since about 2008; 1,4‑dioxane has appeared intermittently since 2021. Staff said split samples were comparable to landfill samples and monitoring will continue through the post‑closure period.
County staff provided an update on split groundwater sampling at Vanko 1 (the Bonko View Lake landfill) during the April 21 meeting, reporting routine monitoring results and additional PFAS testing.
The presenter identified in the record as June (county sampling presenter) said the county split‑sampled monitoring wells last fall and added PFAS analysis to the usual tests for dissolved metals, volatile organic compounds and inorganics. June said perfluorobutanoic acid (PFBA) showed up in…
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