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Congressional District # 03


EPA ID# MND044799856
Last Updated: March, 2015

Site Description

The Joslyn Manufacturing & Supply Company (Joslyn) Site is located within the city limits of Brooklyn Center in Hennepin County, Minnesota. The site is now divided into two discrete areas: the 25-acre portion of the site that has been deleted from the National Priorities List (NPL) and redeveloped for commercial use and the 11-acre West Area.  The redevelopment of the eastern portion of the Site has occurred since 2000.  The westernmost portion of the site, the West Area, remains undeveloped.  Middle Twin Lake borders the western perimeter of the West Area of the site.

The Joslyn Site was used for wood treating from the 1920s until its closure in 1980.  The wood treating process began with a creosote thermal process and, in 1965, it changed to a pressure treating process with pentachlorophenol (PCP) and a water-soluble process using chromated copper arsenic (CCA).  Wastes from these processes were placed in waste disposal ponds on the site.  Process sludge was also buried on the site.  In addition, during the 1950s and 1960s, wood-treating solution spills occurred at the site.

Site Responsibility

This site is being addressed through state and potentially responsible party (PRP) actions.  The site is part of an enforcement deferral agreement between EPA and the Minnesota Pollution Control Agency (MPCA) and all work at the site is overseen by MPCA.

Threats and Contaminants

The primary contaminants at the Joslyn Site are the following wood-treating chemicals:  PCP, carcinogenic and non-carcinogenic polycyclic aromatic hydrocarbons (PAHs), and dioxins/furans.  The PAHs are constituents of creosote.  The dioxins/furans are byproducts of the PCP.  Approximately 76,000 cubic yards of soil were found to be contaminated at the site.  A contaminated groundwater plume also existed that is at least 30 acres in area. 


Cleanup Progress

In 1981, Joslyn removed and disposed of approximately 30,000 gallons of wood-treating solutions at a hazardous waste facility.  In 1983, MPCA issued a Request for Response Action (RFRA) to Joslyn requesting that Joslyn undertake additional remedial actions to abate the release of hazardous substances at the site.  In 1984, EPA listed the site on the National Priorities List (NPL) due to extensive soil and groundwater contamination. 

In 1985, MPCA and Joslyn entered into a Consent Order to continue the investigation and cleanup of the site.  In 1988, Joslyn excavated and disposed of 18,818 tons of contaminated soil in a permitted hazardous waste landfill.  A groundwater pump and treat system was installed in March 1989 and documented through a Record of Decision (ROD) issued by MPCA later that year.  The selected remedies were groundwater pumping and treatment with discharge to a municipal wastewater treatment plant, recovery and disposal of dense non-aqueous phase liquids (DNAPL), and landfilling and bioremediation of certain contaminated soils.  Cleanup of soils was required to industrial use standards.

In 1999, MPCA staff verified that the remedial actions were operating as designed and that all contaminated soils had been removed to the required levels from all areas except for the West Area.  The soil remedy was completed for the eastern portions of the site and those areas were redeveloped during 1999-2004, including deletion from MPCA's Permanent List of Priorities (PLP) and EPA's NPL.

MPCA completed the most recent Five-Year Review Report for the site in 2009.  The report indicated that the groundwater and DNAPL remedies at the Joslyn Site are functioning as intended and are protective of human health and the environment.  The groundwater extraction remedy is removing contaminants from the aquifers and is providing containment of the contaminant plume.  The DNAPL recovery system continues to remove DNAPL.  The soil remedy for the eastern portion of the site has addressed the soil impacts, and the site cover continues to be protective of human health and the environment.  Restrictive covenants have been placed on the site to ensure the remedy remains effective.  These covenants prohibit water wells from being constructed on site, they limit site use to industrial use, and they preserve rights to access for state and federal environmental inspection and for a responsible party to operate and maintain remedial actions. 

In 2014, MPCA began an updated Five-Year Review for the Site that will be completed in 2015.

The West Area soil portion of the site, also known as Operable Unit (OU) 5, has not yet been cleaned up.  This area has been fenced as an interim security precaution to limit access by the public until a remedy can be implemented.  Signs have been posted on the fence to warn the public of the contamination that remains in this area.  Currently, under MPCA oversight, Joslyn is conducting a Feasibility Study to evaluate alternative cleanup methods for this area.  When the study is complete, MPCA will select a remedy for this area, in consultation with the public, and the area will be cleaned up.  



Property Reuse

The eastern two-thirds of the Joslyn Site has been redeveloped under actions carried out under the approval of the MPCA.  The redevelopment consisted primarily of the construction of three buildings, along with associated parking and drive areas and the extension of Azelia Avenue. Redevelopment and/or road construction on adjacent properties have not adversely affected the on-site remedial actions.  Completion of the various phases of redevelopment required cooperation and coordination between Joslyn, the City of Brooklyn Center, the developer (Real Estate Recycling, LLC), the MPCA, and others.

In 2012, EPA issued a case study documenting reuse of the property and the benefits it brought to the surrounding community.



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

Community Involvement Coordinator, U.S. EPA
susan pastor
(312) 353-1325




Site Profile Information

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


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