EHC® PRB for Treatment of CT Plume at a Grain Silo in Kansas

The EHC® PRB was installed as a line of direct push injection points across the width of the plume. Eight 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.

Products
Type of Site

Grain Silo

Location

Kansas, USA

Contaminants Treated

Chlorinated Solvents

Groundwater emanating from a former grain storage area is impacted with carbon tetrachloride (CT). The CT plume extends approximately 2,500 ft (760 m) from a grain elevator where it discharges into a small creek. The CT source area is elusive and access restrictions due to residential housing further complicates source clean-up. Therefore, as an interim measure to prevent further plume migration, a permeable reactive barrier (PRB) was installed across the plume in April 2005. The PRB was created by injecting EHC®in situ chemical reduction (ISCR) compound 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 eight years now continuously supporting more than 95% removal of CT from groundwater, without accumulation of catabolites.