Project Highlight: Zero-Valent Iron (ZVI) Injections into Siltstone

At a large manufacturing facility, chlorinated volatile organic compounds (VOCs) including PCE and TCE, and their associated daughter products, were detected in groundwater. The concentrations of chlorinated VOCs in groundwater ranged between 100 and 500 ppb, exceeding applicable remediation criteria.

The site geology is dominated by slightly fractured siltstone at depths, but silt deposits were detected in a lower-lying area of the site. Due to the tight nature of the formations, enhanced emplacement was required in some areas to distribute the reagent to treat groundwater. Cascade executed pneumatic and hydraulic emplacement injections with direct push technology to inject zero-valent iron (ZVI) powder to achieve remediation objectives.