• AquiFix was selected to extend donor longevity, with the barrier designed for a 10-year lifespan.
• The PRB was installed along a 200-foot alignment with 51 injection points spaced 6 feet apart and depths of 9–44 feet.
• After 12 months, downgradient contaminant concentrations declined by ~99%

An injectable permeable reactive barrier (PRB) was installed as an interim remedy to control migration of chlorinated ethenes (CEs) and chlorinated benzenes (CBs) at a former semiconductor facility. The PRB incorporated AquiFix®, a long-term solid-phase electron donor, along with PlumeStop®, sulfidated micron-scale ZVI (S-MicroZVI®), and a bioaugmentation culture. Within 12 months, downgradient contaminant concentrations were reduced by approximately 99%, with all but one monitoring location achieving cleanup goals. Historic solvent releases created a mixed plume of CEs and CBs migrating beneath the site. Treatability studies indicated limited CB degradation with ZVI and Dehalococcoides (DHC) alone. To address this, the PRB design included colloidal activated carbon (CAC) for adsorption, AquiFix for sustained donor release, S-MicroZVI for abiotic degradation, and a microbial blend of DHC and Dehalobacter (DHB) to enhance biotic dechlorination. AquiFix was selected to extend donor longevity, with the barrier designed for a 10-year lifespan.