An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

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The site was a wood preserving facility that is no longer active.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 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.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.