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Congressional District # 04


EPA ID# MND000819359
Last Updated: March, 2015

Site Description

The Koppers Coke Site covered approximately 38 acres at the intersection of Energy Park Lane and Norris Circle in Saint Paul, Minnesota.   Historically, the site was used by Koppers, Inc. to produce foundry coke and coking byproducts.  The coking facility operated at the site from 1917 to 1979.  The site was acquired in 1981 for reuse by the Port Authority for the Saint Paul Energy Park, and 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 major regional 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 (EPA's) Enforcement Deferral Pilot Program which deferred 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 (PAHs), metals, and cyanide compounds. 

Cleanup Progress

In 1978, Koppers and the Minnesota Pollution Control Agency (MPCA) entered into an agreement that established conditions for the facility's demolition and a preliminary investigation of the subsurface.  Koppers demolished all standing structures and removed storage tanks in 1981.  In 1982 , approximately 240,000 gallons of residue were removed from 20 tanks and disposed of in a federally-approved facility.  Also, approximately 21,600 cubic yards of contaminated soils were excavated and disposed of off-site.

Following additional investigation and feasibility study, in 1994, MPCA issued a remedy decision which required confirmation of soil removal and implementation of in-situ treatment of groundwater through bioremediation.  The in-situ bioremediaton system began operation in 1996.  MPCA modified the groundwater remedy in 1998 to discontinue in-situ treatment and monitor natural attenuation of the remaining groundwater contamination.  The remedy modification also included restrictions on the use of groundwater at the site.   An enhancement to the monitoring well network was completed in 1998.  MPCA conducts periodic Five-Year Reviews at the site. 

In 2014, MPCA conducted an assessment of potential vapor intrusion risk at the site.  Soil gas above the groundwater plume was measured for volatile contaminants.  Results indicated that contaminant concentrations in soil gas are low and mitigation for vapor intrusion risk is not needed at the site.    

Property Reuse

During the early stages of cleanup at the site, development was underway at the adjacent Energy Park project.  The goal of this project was to improve the economic environment in Saint Paul and the surrounding area.  The site property was aquired by the Port Authority, who conducted part of the cleanup of the site to enhance redevelopment.  Redevelopment took place in phases, beginning in the 1980s and continuing to the 2000s.  Redevelopment of the final parcel at the center of the Koppers Coke site was completed in 2003 by Ryan Companies, in coordination with the Port Authority.  This partnership resulted in the Energy Park Corporate Center that now provides significant economic development to the area.  EPA documented the reuse project and benefits to the community in a fact sheet issued in 2012.


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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