Public Notice: EPA Releases Explanation of Significant Differences for Moss-American Superfund Site

Summary

The U.S. Environmental Protection Agency has formalized a change to the existing cleanup plan at the Moss-American Superfund site in Milwaukee, WI. To address a limited area of site contamination, the EPA will use offsite disposal instead of “low temperature thermal desorption” treatment. This modification is documented in the Explanation of Significant Differences report. The EPA prepares an ESD when changes to the original selected remedy are significant, but do not fundamentally alter the original remedy’s scope, performance, or cost.

A 2011 evaluation at the site recommended excavating and disposing of soil impacted by napthalene and non-aqueous phase liquid (NAPL). Compared to the existing on-site treatment, offsite disposal takes less time to achieve cleanup objectives, requires less equipment, and is more cost effective. Implementation of the remedy is estimated to begin in fall 2024 or spring 2025.

Please contact the Remedial Project Manager or Community Involvement Coordinator with any questions.

Remedial Project Manager
William Murray
(murray.williamj@epa.gov)
312-353-6324

Community Involvement Coordinator
Karen Chen
(chen.karen01@epa.gov)
312-886-6009