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.
Kansas, USA
Chlorinated Solvents
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.
As featured in Remediation Journal, EHC Reagent was injected via direct push across the source area. Site specific challenges included a low permeability clayey lithology and a large degree of CVOC mass sorbed at the smear zone due to large variations in the groundwater table.
EHC was injected into a series of permeable reactive barriers (PRBs) across the plume with the goal to treat the entire plume area over time. After only 6 months CT concentrations were reduced by 99.7%, with all monitoring wells meeting the groundwater clean up criteria.
As featured in Remediation Journal, EHC® Reagent and KB-1® Bioaugmentation Culture were injected across the highest concentration area from approximately 40 to 112 ft bgs using direct push. Prior to treatment dissolved phase concentrations ranged as high as 592,000 and 90,000 μg/L for TCE and cis-DCE, respectively.
As featured in Remediation Journal, EHC Reagent was emplaced via hydraulic fracturing into fine-grained sandstone to remediate TCE in groundwater.
EHC® Reagent was evaluated for treatment of soil containing volatile organic compounds (VOCs) and organochlorine pesticides (OCPs). The injections were conducted using hydraulic fracturing.