Our technical team is applying environmental sequence stratigraphy (ESS) at seven active groundwater contamination sites with complex subsurface geology for the Department of Defense. These ESS studies are centered on understanding the potential pathways of per- and polyfluoroalkyl substances (PFAS) and other potential contaminants in groundwater in complex subsurface environments. These sites are among more than 100 sites around the country where our team has applied this approach.
ESS is a geology-focused approach used to improve subsurface conceptual site models (CSMs) for groundwater contaminated sites. ESS is used to reduce site uncertainties due to complex subsurface heterogeneities and provides an accurate portrayal of contaminant flow and transport. ESS is an emerging best practice that is supported by the U.S. Environmental Protection Agency (EPA) and has been successfully applied at over 40 federal facilities.