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 will walk 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 will explain how the CSM helped her and her team develop a plan for a longer PRB lifespan, and answer questions afterward during a Q&A.