In this webinar we were pleased to have special guest speakers Dr. Charles Newell, Vice President at GSI Environmental, and Dr. David Adamson, Vice President and Principal Engineer with GSI Environmental. Their presentation examined PFAS Monitored Retention (PMR), a non-destructive extension of monitored natural attenuation in which physical and chemical retention processes are used to protect downgradient receptors; and PFAS Enhanced Retention (PER), the active companion to PMR for sites where natural retention alone is insufficient. They were joined by Paul Erickson, PhD, Vice President of Research and Development at REGENESIS.
Highlights of this free webinar:
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PFAS Monitored Retention (PMR) - A non-destructive extension of monitored natural attenuation in which physical and chemical retention processes are used to protect downgradient receptors
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Tiered Evaluation Framework - A lines-of-evidence methodology for assessing PMR performance using plume mass discharge and travel time to the nearest receptor
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PFAS Enhanced Retention (PER) - Active retention strategies for sites where natural attenuation is insufficient, including capping, colloidal activated carbon (CAC) barriers, and emerging technologies
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Field Validation and Practical Applications - Results from AFFF-impacted sites and a CAC barrier database showing how retention-based approaches can support interim remedies, site prioritization, and long-term site management
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About the Presenters:
Charles Newell, PhD
Vice President, GSI Environmental Inc.
Dr. Charles Newell is a Vice President at GSI Environmental Inc. in Houston. Dr. Newell has co-authored more than 30 technical publications on PFAS fate, transport, and remediation, and has led multiple PFAS research projects funded by the U.S. Department of War. His honors include the 2014 Strategic Environmental Research and Development Program Project of the Year Award, the 2016 Interstate Technology and Regulatory Council Environmental Excellence Award, and the 2024 Gordon Maskew Fair Award from the American Academy of Environmental Engineers and Scientists.
David Adamson, PhD
Vice President and Principal Engineer, GSI Environmental Inc.
Dr. David Adamson is a Vice President and Principal Engineer with GSI Environmental Inc. and has more than 26 years of environmental project experience in environmental consulting and academic research. He is a licensed Professional Engineer in Texas. Since joining GSI in 2004, Dr. Adamson has served as a Principal Investigator or co-Principal Investigator on over 25 DoD-sponsored research projects, including those focused on 1,4-dioxane, PFAS, innovative long-term monitoring strategies, enhanced amendment delivery systems, and improved characterization and treatment methods for contaminants in low-permeability matrices.
Paul Erickson, Ph.D.
Vice President of Research and Development, REGENESIS
Dr. Paul Erickson is the Vice President of Research & Development with REGENESIS,
overseeing the commercialization of new environmental solutions to address complex
remediation challenges. In his time with REGENESIS, Dr. Erickson led the development of
a number of remediation products and technologies, including PetroFix, AquiFix, SourceStop and FluxTracer.
Dr. Erickson earned a BS degree in Chemistry from Florida State University, a
Masters in Chemistry from the University of Minnesota, and a PhD in Environmental
Chemistry from ETH Zurich. He is an author on over 20 peer-reviewed scientific
publications mainly in the area of environmental chemistry.