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U.S. EPA REGION 5
HENNEPIN COUNTY
ST. LOUIS PARK

Congressional District # 05

REILLY TAR & CHEMICAL CORP. (ST. LOUIS PARK PLANT)

EPA ID# MND980609804
Last Updated: March, 2015

Site Description

The Reilly Tar & Chemical Corporation/St. Louis Park Plant site is located in the City of St. Louis Park, in Hennepin County, Minnesota. The site consists of an 80-acre former plant known as the Republic Creosote Works, located near the intersection of Louisiana Avenue and Highway 7, and contaminated groundwater plumes in multiple aquifers beneath the site.  Reilly used the property for coal tar distillation and pressure treatment of wood products from 1917 to 1972.  The City purchased the property in 1972, and, in 1973, the property was conveyed to the Housing and Redevelopment Authority of St. Louis Park.  The Housing Authority subsequently conveyed parts of the property to several other parties. The current use of the property is as a recreational park and for multi-family housing. 

Site Responsibility

This site is being addressed through federal, state, municipal, and potentially responsible party (PRP) actions. 

Threats and Contaminants

The primary wastes generated at the site included a mixture of carcinogenic and non-carcinogenic PAHs.  Subsurface soil and groundwater beneath the site remain contaminated. 

Cleanup Progress

The site was listed on EPA's National Priorities List (NPL) in 1983.  In 1984, EPA signed a remedy decision that required construction of a water treatment system at St. Louis Park drinking water wells 15/10.  The treatment system was constructed and continues to operate.  In 1986, EPA signed a comprehensive remedy decision to implement a Remedial Action Plan attached to a related Consent Decree. The Consent Decree was signed in 1986 by EPA, the State of Minnesota, Reilly, the cities of St. Louis Park and Hopkins, and other parties.  The Remedial Action Plan includes multiple actions to control soil and groundwater sources of contamination, pumping to contain contaminated groundwater plumes, and treatment for additional drinking water wells.  The remedy also included a requirement to invesigate areas of aquifers for which data were insufficient.  EPA issued remedy decisions for the additional areas in 1990, 1992 and 1995, and issued a remedy modification in 1997.

Between 1986 and 1997, a number of pumping wells were installed in the various groundwater aquifers beneath the site to remove contamination and to contain the spread of the contaminant plume.  During this period two additional treatment plants were also consutructed, one for a municipal drinking water well and the other to treat water from several source control wells prior to discharge.  EPA issued a Preliminary Close-Out Report for the site documenting that construction was complete in 1997.  

Between 2010 and 2012, EPA conducted an evaluation of the potential for vapor intrusion risk to residents near the site, including multiple rounds of soil gas, sub-slab, and indoor air sampling.  EPA concluded that the risk to human health was within or below EPA's acceptable risk range and no mitigation for vapor intrusion was needed at the site.

The most recent Five-Year Review for the entire site was completed by EPA and MPCA in 2011, and an addendum to the Five-Year Review was signed in 2014 to update the recommendations. EPA and MPCA concluded that the remedies for the site are protective of human health and the environment in the short-term because source materials have been covered, drinking water affected by contamination at levels established in the Consent Decree is being treated, and many source control and gradient control wells are operating as required. However, EPA and MPCA also recommended that monitoring and gradient control in the Prairie du Chien aquifer be increased, especially southwest of the site.  

As of 2015, two source control wells and one gradient-control well are pumping contaminated groundwater from the Drift-Platteville aquifer; one gradient-control well is pumping from the St. Peter aquifer; and one source-control well and two municipal drinking water wells which support gradient control are pumping from the Prairie du Chien aquifer.  While these pumping wells are providing significant affect on the site, EPA and MPCA are currently in discussion with the City of St. Louis Park in an effort to improve monitoring and gradient control in some locations, especially in the Prairie du Chien aquifer.

Property Reuse

Several townhomes and apartment buildings were constructed on-site in the 1970's.  A major park improvement project was completed in 2002, a commercial building was constructed in 2004 and road improvement projects were completed between 2004 and 2014.  Other road improvement projects are planned.  A construction plan for each project is reviewed by the Agencies to assure that activities are conducted in a safe and environmentally appropriate manner.            

Contacts

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

Community Involvement Coordinator, U.S. EPA
Heriberto Leon
(312) 886-6163

Aliases

REILLY TAR & CHEM ST LOUIS PARK
REILLY TAR & CHEM REPUBLIC CREOSOTING CO
REILLY TAR&CHEM (ST. LOUIS PARK PLANT)

 

Site Profile Information

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

 


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