Superfund Site Profile

We invite your comment!

The Utah Department of Environmental Quality (UDEQ) and U.S. EPA have issued an Explanation of Significant Differences (ESD) covering recommendations for four Records of Decision pertaining to the Kennecott North and South Zone cleanup located in Salt Lake County and Tooele County, Utah.

The ESD addresses deficiencies identified in the 2014 and 2016 five-year review reports for the Kennecott North and South Zones, regarding the clarification of and need for Institutional Controls (ICs). The ICs will include municipal permitting, require appropriate management of contaminated soils, and critical evaluation of proposed drilling of wells into or near contaminated groundwater plumes.

The modifications to the remedy described in the ESD do not alter the selected remedy in any fundamental aspect regarding primary treatment method. The clarifications are intended to increase the long-term protectiveness of the selected remedies.

Please submit comments on the ESD by email through September 20, 2017 to:

Douglas Bacon (
UDEQ Project Manager


Kerri Fiedler (
EPA Project Manager


The Kennecott South Zone includes the Bingham Mining District in the Oquirrh Mountains, about 25 miles southwest of Salt Lake City, Utah. The area includes Bingham Canyon open pit mine, associated waste rock dumps, the Copperton Mill and many other historic sites. Mining activities at the site began in the 1860s and continue today. The resulting wastes contain hazardous substances, including heavy metals. Soils and sludge are contaminated, as are surface water and groundwater, which affect wetlands between the site and the shore of Great Salt Lake. Cleanup is ongoing. The site is not listed on the National Priorities List (NPL) but is considered to be an NPL-caliber site and is being addressed through the Superfund Alternative Approach.