EHC® Reagent for Treatment of PCE Source Area at a Former Dry Cleaner Site in Oregon

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.

Products
Type of Site

Former Dry Cleaner

Location

Corvallis, Oregon USA

Contaminants Treated

Chlorinated Solvents

Groundwater at the former Serry’s Dry Cleaning site in Corvallis, Oregon, was impacted by chlorinated volatile organic compounds (CVOCs). The primary CVOCs impacting the site include tetrachloroethene, trichloroethene, dichloroethene, and vinyl chloride. Field-scale pilot tests were performed for the Oregon Department of Environmental Quality’s Dry Cleaner Program to evaluate the performance of EHC® in situ chemical reduction (ISCR) technology. The pilot study involved evaluating field performance and physical distribution into low-permeability soil using basic Geoprobe® injection tooling. The testing results confirmed that bioremediation enhanced by ISCR supported long-term treatment at the site. This article describes the implementation and results of the tests. Performance data are available from a three-year period following the injections, allowing for a discussion about sustained performance and reagent longevity.