PFAS Remedy Design and Implementation in Challenging Hydrogeological Settings

Geosyntec’s site characterization and remedy design teams faced a hydrogeologically-challenging site with PFAS contamination. The site had steeply-sloping topography and aquifers that thinned out near a major surface water body which experienced episodes of seasonal flooding. Geosyntec developed a robust conceptual site model by studying the site setting, formulating critical hydrogeological insights, and developing these through iterative field investigations. Investigation results revealed a previously unidentified major PFAS transport pathway at the Site: a set of upwelling groundwater channels. Geosyntec engineers then designed and implemented an innovative, fully passive water treatment remedy for the upwelling groundwater channels. The remedy, a set of flow-through cells, has consistently removed over 99% of target PFAS from influent water.

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