• Within two months of injection, contaminants were reduced to non-detect levels and have remained non-detect
• AquiFix was selected for its extended electron donor release, enabling treatment of CVOCs migrating into the barrier from an inaccessible upgradient source

Working with the environmental consultant, REGENESIS designed and implemented an in situ permeable reactive barrier (PRB) to quickly and effectively treat chlorinated volatile organic compounds (CVOCs) at a former dry cleaner in southern Indiana. The barrier used a combined remedy of AquiFix®, PlumeStop®, sulfidated micron-scale ZVI (S-MicroZVI®), and Bio-Dechlor INOCULUM® Plus. Within 49 days, CVOC concentrations in downgradient well MW-8D were reduced to non-detect levels and remaining at non-detect for more than a year. Historic releases of tetrachloroethene (PCE) and trichloroethene (TCE) created a CVOC plume migrating beneath the site. Elevated breakdown products—cis-1,2 dichloroethene (cis-DCE) and vinyl chloride—posed risks to downgradient receptors. The Indiana Department of Environmental Management (IDEM) approved the interim remedy in 2024 to stabilize the plume and prevent further migration.