Groundwater-Surface Water Interaction Modeling
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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 Abstract Per- and polyfluoroalkyl substances (PFAS) are persistent and widely distributed in the environment from commercial products and waste process residues, including in surface waters
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The Faroe Islands: The Scientific Backbone of EPA’s PFAS Advisory?
The video below is a recording of a February 1, 2023 webinar, in which I discuss USEPA’s extremely low Drinking Water Health Advisory Levels (HALs) for PFOA and PFOS. The published HALs are scientifically questionable and have profound, negative economic and sociopsychological effects, because legal disputes and the public at large reference the HALs as
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Class Action: Metal Plating Facility and PFAS Drinking Water Contamination
Retained as a testifying expert in litigation involving a metal plating facility, where documented releases of nickel and chromium have occurred. PFOA and PFOS have been detected in the drinking water of local residents using private wells.
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Visualization of Groundwater Contamination by PFAS Firefighting Foam AFFF
This webinar excerpt explores how aqueous film-forming foam (AFFF) used in firefighting can lead to groundwater contamination, particularly at airports, military bases, and industrial sites. The video explains how per- and polyfluoroalkyl substances (PFAS), often called “forever chemicals,” migrate through the environment and impact groundwater, surface water, and ecosystems. Key topics covered include: AFFF Usage
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Laboratory Experiment to Visualize Groundwater Pollution
This webinar excerpt explores how contaminants move through groundwater and provides a mental framework for understanding subsurface pollution. Since groundwater contamination is hidden beneath the surface, visualizing it is often challenging. This presentation enhances conceptual understanding by using a water-saturated sand tank experiment to demonstrate the flow and transport mechanisms of contaminants in groundwater. The
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Groundwater Fundamentals
This video offers a clear and accessible introduction to the fundamentals of groundwater science, ideal for anyone new to the topic or needing a quick refresher. Topics covered include: Basic definitions: aquifers, aquitards, and groundwater zones Groundwater-surface water interactions Confined vs. unconfined aquifers The water table and saturated flow How groundwater flows and how it’s
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Why Groundwater Matters: A Visual Overview
The Groundwater Resource provides a brief overview of groundwater as a critical water supply, emphasizing its global significance, hydrogeologic characteristics, and widespread reliance for drinking water and irrigation. This video is an excerpt from the seminar “Introduction to Groundwater Contamination”, presented to the UC Berkeley Department of Civil and Environmental Engineering in September 2021. Key
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Multiparty Contaminant Source Identification – Groundwater in Fractured Bedrock Aquifer
Investigation design and analysis of hydrogeologic data at complex fractured bedrock site enabled identification of additional PRPs responsible for groundwater plumes beneath and downgradient of client’s manufacturing plant. Investigation findings provide a basis for remedial design, plume apportionment, and litigation strategy. Prepared a comprehensive Conceptual Site Model report and detailed expert rebuttal challenging the Plaintiff’s
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Surface Water Bacterial Contamination – Pro Bono Technical Advisory Support
Engaged as a technical advisor to assist a resident in identifying appropriate surface water sampling locations to investigate bacterial contamination. The resident had measured high concentrations of coliform and E. coli bacteria in a creek running through their property after experiencing a rash from bathing/swimming in the water. The objective of the investigation is to
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