The site was a wood preserving facility that is no longer active. Key contaminants at the site includepentachlorophenol (PCP), chromium, and to a much lesser extent dioxin, arsenic, and polynuclear aromatic hydrocarbons (PAHs). Both light non-aqueous phase liquids (LNAPL) and dense nonaqueous phase liquids (DNAPL) represent continuing sources of dissolved PCP 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.

• Remediation System Evaluation, MacGillis and Gibbs Superfund Site (PDF)(31 pp, 776 K, 2002, 542-R-02-008c)