PFAS source zones present a difficult remediation challenge because impacted soil can continue to act as a long-term source to groundwater and may require a strategy that limits mobility while supporting future site use. This webinar will focus on how in situ stabilization/solidification (ISS) can be applied to PFAS source zone remediation by mixing amendments directly into impacted soil to create a more stable, lower-permeability treatment mass. Attendees will learn how ISS design decisions, including treatability testing, amendment selection, mixing method, quality control, and sequencing, influence remedy performance and constructability. The session will also introduce potential GeoSierra trenchless permeable reactive barrier (PRB) applications in theory, including how trenchless delivery concepts may complement source zone or downgradient control strategies where access, depth, or surface disruption are limiting factors.
Key Learning Points
- Understand how ISS can reduce contaminant mobility by improving strength, lowering permeability, and decreasing contaminant leachability in impacted source-zone soil.
- Learn how to evaluate ISS applicability for PFAS source zones, including amendment selection, treatability testing, mixing method, depth, access, groundwater, utilities, and redevelopment sequencing.
- Discover where GeoSierra trenchless concepts may fit as a complementary approach for source-zone containment, plume cutoff, or deeper treatment applications that are difficult to access using conventional excavation or mixing methods.
Why Attend
Attend this webinar to better understand when ISS and/or GeoSierra trenchless PRBs may be practical options for PFAS source zone management and what project teams should evaluate before implementation. You will leave with a working framework for comparing source zone treatment tools, improving amendment contact with impacted soil, and identifying where GeoSierra may support more targeted or lower-disruption remediation designs.
About the Presenters
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Paul Lear, Ph.DSenior Technical Director, Civil & Environmental ConstructionDr. Paul Lear, a leading authority in stabilization/solidification (S/S) technology, brings over 30 years of experience in full-scale remediation projects to Cascade. As a key technical expert in In Situ Stabilization (ISS), Dr. Lear has pioneered numerous groundbreaking advancements in the field. Dr. Lear's expertise extends internationally, with notable achievements such as the first S/S of organic wastes in Australia and the first large-scale S/S treatment in Canada. |
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Deborah Shaffer (Schnell), P.E.Director of Project Management, Civil & Environmental ConstructionDeborah Shaffer (Schnell) is the Director of Project Management at Cascade. She is a leading national expert on permeable reactive barriers (PRBs), hydraulic and pneumatic fracturing, and in situ technologies such as in situ chemical oxidation (ISCO) and in situ chemical reduction (ISCR), with a focus on amendment distribution. Deborah works with clients to select the best remedial technology for their sites, based on data presented in their conceptual site model (CSM), project timelines, and budget. |
