USS Lead Superfund Site
The USS Lead Superfund site is located in East Chicago, Indiana. The site includes part of the former USS Lead facility along with nearby commercial, municipal and residential areas. The primary contaminants of concern are lead and arsenic. The USS Lead site was listed on the National Priorities List of the worst contaminated sites in the country in 2009. The Superfund site is broken into two Operable Units. The first, OU1, has been divided into three zones. These zones include a public housing complex and residential properties.
The Proposed Explanation of Significant Differences (46 pp, 1.79 MB, About PDF) documents the significant increase between the estimated cost of the cleanup selected in the Record of Decision (81pp, 7.71 MB, About PDF) for Zones 2 and 3 of Operable Unit 1 of the site and the current estimated cost. The original estimated cleanup cost was $22.8 million; currently, the cost estimate has been revised to $84.9 million. Even with this projected increase in costs, EPA has determined that the cleanup selected in the 2012 ROD—excavation of contaminated soil and off-site disposal—is still the correct remedy for Zones 2 and 3 and continues to meet the requirements of the National Oil and Hazardous Substances Contingency Plan.