Experience
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PFAS Fingerprinting – Appeal and Caveats
This video is meant for educational purposes; it presents simple PFAS fingerprinting scenarios; One involves two rivers and a fire training facility as a potential PFAS source. The goal is to identify the origin of PFAS detected in downstream surface water samples. A second scenario shows groundwater concentrations in monitoring wells, initially suggesting multiple sources. […]
Conceptual Understanding of PFAS Fractionation in Groundwater
This video explains why PFAS “chemical signatures” measured in groundwater can differ from place to place even when there is only a single contaminant source. The concept of PFAS fractionation (also referred to as PFAS enrichment) is a fundamental fate-and-transport process driven by differential sorption to organic carbon in aquifer materials. This microscale and macroscale […]
Review of Remediation Costs at RCRA Megasite
Independent forensic hydrogeology review of a large-scale groundwater remediation cost estimate prepared for a former industrial site. Why This Engagement Mattered Cleanup cost estimate exceeded $1.7 billion Cost driven primarily by assumed contaminant mass rather than measured conditions Required technical scrutiny beyond routine environmental review Scope of Review Examined conceptual site […]
“Introduction to Groundwater Contamination by PFAS at Airports and Military Bases”
The short video below describes the composition, use, and potential effects of PFAS-containing firefighting foam known as Aqueous Film Forming Foam (AFFF). It includes pictures and animations that illustrate the evolution of a groundwater plume from a fire training area, the potential impact of the plume on groundwater and municipal water supply, and various other […]
EPA’s Unprecedented Interim Drinking Water Health Advisories for PFOA and PFOS
By Joe Cotruvo(1), Susan Goldhaber(2), and Andrew Cohen, Issue Paper in Groundwater, February 20, 2023. 1. Former Director, USEPA Drinking Water Standards Division. 2. Former Toxicologist, USEPA Per- and polyfluoroalkyl substances (PFAS) are persistent and widely distributed in the environment from commercial products and waste process residues, including in surface waters usually […]
Hydrogeologic Exploration to Benefit Farmers in Morocco
Hydrogeologic reconnaissance was performed at 4 sites in the High Atlas Mountains and Middle Atlas Mountains in Morocco with the purpose of identifying locations for accessing groundwater for irrigation. The work was performed in collaboration with the High Atlas Foundation. This January 31, 2024, webinar presents the methodologies and findings of hydrogeologic reconnaissance […]