To account for the recent discovery of new and emerging contaminants, 1,4-dioxane and perfluoroalkyl substances (PFAS), in groundwater at two of the Minnesota Pollution Control Agency’s closed landfills—the East Bethel and WDE landfills—Barr is developing updated conceptual models to help understand the extent of the contamination. Existing remediation systems have been in operation for many years to address volatile organic compounds in groundwater at these two landfills. Based on new groundwater regulatory guidance for these emerging compounds, it was determined that the existing remediation systems have not fully captured the larger plumes associated with 1,4-dioxane and PFAS.
Barr is conducting groundwater modeling and planning additional site investigation with the MPCA to create an updated conceptual model of the plumes. Based on the upcoming information, we may also develop recommendations for expanded groundwater remediation systems and alternate treatment technologies to address the emerging regulatory guidance, particularly for PFAS.
Vice President Senior Civil Engineer