Client Testimonial: Washington Superfund Site

“Due to a combination of subsurface conditions and the limitations of pump and treat technology, our Washington Superfund client needed an in situ remedy to address recalcitrant Cr(VI) and TCE contamination in groundwater. Concentrations of Cr(VI) and TCE in the hot spot area were approximately 200 ppb and 8 ppb respectively. EA evaluated a number of products capable of addressing these commingled contaminants, and chose Adventus Group’s EHC-M because it supports both chemical and biological reduction processes, resulting in greater longevity over other products due to the ZVI component. EHC-M was applied using direct push injection at depths of 80 to 90 feet below the surface and, within 3 months of the application, Cr(VI) and TCE concentrations were below detection limits.”

—Eric Marhofer, Project Manager, EA Engineering, Science, and Technology, Inc.

EHC-M^® In Situ Immobilization of Soluble Metals

EHC-M^® is specially formulated metal remediation compound for in situ immobilization of soluble metals via enhanced precipitation and adsorption. The controlled-release feature of the carbon provides for extended longevity and greatly assists in maintaining very low redox conditions through simultaneous microbial consumption of the carbon and electron acceptors. Arsenic, for example, is precipitated through the production of iron arsenic sulphide minerals that are practically insoluble in groundwater.

Figure 1. Reduced solubility of arsenic in soil. EHC-M^® is well suited for treating environments co-impacted by heavy metals and chlorinated solvents.

2. Influence of EHC-M on arsenic concentration (column tests, groundwater velocity of 15 cm/d)

3. Summary of Metals Tested with EHC-M

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