In-situ chemical reduction to remediate hexavalent chromium contaminated groundwater

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Hexavalent chromium contaminated groundwater was identified at a site formerly used for electroplating.

Following a detailed investigation and options assessment, GHD selected in-situ chemical reduction (ISCR) as the preferred remediation response. A recirculation system based on injection and extraction wells was used to distribute the reductant (sodium metabisulphite). A two month injection program succeeded in reducing the hexavalent chromium concentrations by 60 percent, allowing monitored natural attenuation to be used as the ongoing long term management strategy.

Contamination Assessment & Remediation

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