Remediation System Evaluation, MacGillis and Gibbs Superfund Site
The site was a wood preserving facility that is no longer active. Key contaminants at the site include pentachlorophenol, chromium, and to a much lesser extent dioxin, arsenic, and polynuclear aromatic hydrocarbons. Both light non-aqueous phase liquids and dense nonaqueous phase liquids represent continuing sources of dissolved pentachlorophenol groundwater
contamination. The site is underlain by a sequence of glacial sands and tills. The uppermost unit is the New Brighton Formation, which consists of sand and clayey silt. The remediation system addresses the New Brighton aquifer.