The EHC® PRB was installed as a line of direct push injection points across the width of the plume. Twelve years after the installation the PRB is still supporting >90% reduction in inflowing CT concentrations and the downgradient plume has reduced significantly in size and concentration.
Groundwater emanating from a former grain storage area was impacted with carbon tetrachloride (CT). The CT plume extended approximately 2,500 ft (760 m) from a grain elevator where it discharged into a small creek. The CT source area was elusive with access restrictions due to residential housing further complicating the source clean-up. A permeable reactive barrier (PRB) was installed across the plume in April 2005. The PRB was created by injecting EHC® Reagent in a line of direct push injection points installed along the first available roadway located downgradient from the source area. This project represents the first full-scale application of EHC into a flow-through reactive zone and the PRB has remained active for twleve years now continuously supporting more than 95% removal of CT from groundwater, without accumulation of catabolites.