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Congressional District # 04


EPA ID# MND000819359
Last Updated: January, 2011

Site Description

The Koppers Coke (Koppers) site covers approximately 38 acres and is located in the city of St. Paul, in Ramsey County, Minnesota.   Historically, the site was used by Koppers, Inc. to produce foundry coke and coking byproducts such as coal tars and coal tar distillates.  The coking facility operated at the site from 1917 to 1979.  In 1978, Koppers and the Minnesota Pollution Control Agency (MPCA) entered into an agreement that established conditions for the facility's demolition and an investigation of the subsurface.  The company demolished all standing structures and removed storage tanks in 1981. The site was acquired in 1981 by the Port Authority for the St. Paul Energy Park.  Office buildings and light industrial buildings now occupy the site.  Approximately 15,400 residents live within one mile of the site. The nearest residence is located approximately 100 feet away, and Como Park, a recreational facility, is located three-quarters of a mile from the site. 

Site Responsibility

This site was addressed through state of Minnesota and potentially responsible party actions under the United States Environmental Protection Agency's (U.S. EPA's) "Deferral Pilot" program which defers site management and enforcement to the state.  

Threats and Contaminants

Storage and disposal practices along with the dumping of wastes on the land surface, and various leaks and spills resulted in contamination of both soil and groundwater with volatile organic compounds (VOCs), semi-VOCs, polynuclear aromatic hydrocarbons (PNAs), metals, and cyanide compounds. 

Cleanup Progress

Koppers removed contaminated soils in the 1980s and early 1990s. In fall 1982, before the site was listed on the National Priorities List (NPL), Koppers disposed of about 240,000 gallons of residue in 20 tanks in a federally-approved facility and approximately 21,600 cubic yards of contaminated soils were excavated and disposed of. On March 25, 1986, the MPCA Citizen's Board issued a request for response action to Koppers to conduct a remedial investigation/feasibility study (RI/FS) and implement a cleanup plan. On April 21, 1994, MPCA issued the Record of Decision (ROD), which required confirmation of soil removal and implementation of in-situ bioremediation of groundwater. An in-situ pilot bioremediaton system began operation in 1996.  The evaluation of the in-situ pilot system was completed in 1997 and MPCA determined that the bioremediation system as operating was sufficient.  The ROD was modified in 1998 to require monitored natural attenuation and institutional controls for the remaining ground water contaminant plume.  An enhancement of the monitoring well network was completed in 1998 and a Preliminary Close-out Report was signed documenting the completion of all construction at the site.   Five-Year Reviews were conducted in 2003 and 2008 by the MPCA which concluded that the remedy remains protective of human health and the environment.  If groundwater continues to attenuate as expected and all other requirements are met, the site may qualify for deletion from EPA's National Priorities List in aproximately 2016. 

Property Reuse

The site has been redeveloped for commercial and light industrial use under the St. Paul Port Authority and is in an area of St. Paul known as Energy Park.


Remedial Project Manager, U.S. EPA
leah evison (evison.leah@epa.gov)
(312) 886-2064

Community Involvement Coordinator, U.S. EPA
cheryl allen
(312) 353-6196




Site Profile Information

This profile provides you with information on EPA's cleanup progress at this Superfund site.


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