How Understanding a Site's Conceptual Site Model Can Prolong the Life Expectancy of a ZVI PRB Remedy

One of the major benefits of a zero-valent iron (ZVI) permeable reactive barrier (PRB) remedy is its lifespan—once implemented, it can continue to filter contaminants for decades. But to gain that result, the treatment approach must be developed based on a deep understanding of the conceptual site model (CSM).

In this webinar, renowned PRB expert Deborah Schnell walks attendees through an actual project conducted in Southern California. Multiple remedies were selected to address on-site trichloroethene (TCE) hot spots, including in situ chemical oxidation, phytoremediation, and in situ thermal destruction. However, an off-site plume was channeled by a bedrock outcrop, creating a kidney-shaped plume that traveled through a residential neighborhood. To address this, a ZVI PRB was installed mid-plume to reduce downgradient TCE concentrations. Simultaneously, the team was challenged to find ways to extend the life of the PRB, which was located in subsurface conditions that had the potential to accelerate the degradation of the ZVI. Deborah explains how the CSM helped her and her team develop a plan for a longer PRB lifespan, and answers questions afterward during a Q&A.

This webinar broadcast is pre-recorded, but you will have the opportunity to download additional materials and submit questions, which our experts will follow up and respond to.

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