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Congressional District # 10


EPA ID# ILD000802827
Last Updated: July, 2015

Site Description

The Outboard Marine Corporation (OMC) Superfund site is located on Lake Michigan on and around the northern Waukegan Harbor area in Waukegan, Lake County, Illinois.  The site contains four cleanup parcels, called "operable units" (OUs). The Waukegan Harbor (WH) site is OU 1, the Waukegan Manufactured Gas and Coke Plant (WCP) site is OU 2, the PCB Containment Cells, which were created when the harbor was first cleaned up in 1990-1993, comprise OU 3, and the OMC Plant 2 site is OU 4.

Waukegan Harbor is a federally-authorized and federally-maintained harbor that was constructed in the late 1800s to serve the Lake County area. The harbor is a designated port of refuge for boats caught in severe storms. Land use in the immediate area is marine-recreational and industrial. Several industries still use the harbor to deliver raw material (gypsum, cement) from Michigan to make wallboard and concrete in manufacturing facilities located directly on the harbor. Pleasure boaters are served by a private marina located at the north end of the harbor and the Waukegan Port District also maintains a small craft mooring area in the harbor's central area. The city of Waukegan maintains a public beach on Lake Michigan southeast of the WCP site and adjacent to the harbor's entrance channel.

From about 1948 to December 2000, OMC manufactured outboard motors in its OMC Plant 2 facility located to the north of (but not on) Waukegan Harbor.  In the 1960s and 1970s, OMC had purchased an estimated 8 million gallons of hydraulic fluid containing polychlorinated bipenyls (PCBs) for use in its various types of machinery making engine parts. The fluids containing PCBs were sometimes discharged through floor drains leading into sewers that discharged onto the OMC Plant 2 grounds and into Waukegan Harbor. As a result, an estimated 700,000 pounds of PCBs were estimated to be present in the soil on the OMC Plant 2 site and another 300,000 pounds of PCBs were estimated to be in the sediment in Waukegan Harbor. Under EPA's oversight, OMC cleaned up PCB-contaminated northern harbor sediment and some PCB-contaminated OMC Plant 2 site soils in 1990-1993.

OMC operated several vapor degreasers at the OMC Plant 2 facility to clean newly made boat engine parts with trichloroethylene (TCE). Leaking degreasers and/or TCE storage tanks created a widespread TCE groundwater contaminant plume and an isolated dense, non-aqueous phase liquid (DNAPL) pool of pure TCE beneath the OMC Plant 2 site. After declaring bankruptcy in December 2000, OMC legally abandoned its Plant 2 facility in December 2002.

In the early 1900s, a wood-treating plant operated on the WCP site, followed by a manufactured gas plant in the 1920s and a coke oven gas plant in the 1940s. The WCP site was purchased and the coke plant was disassembled by OMC in approximately 1972. Contamination at the WCP site was discovered during OMC's harbor cleanup in the early 1990s. The WCP site has arsenic and polyaromatic hydrocarbon (PAH) soil contamination and the groundwater is contaminated with high levels of ammonia, arsenic, benzene, and phenol.

After OMC declared bankruptcy, the city of Waukegan purchased the WCP site and then the OMC Plant 2 site from the bankruptcy estate as part of its plan to revitalize its lakefront. Waukegan plans to build townhomes and condominiums on the WCP and OMC Plant 2 sites - once any necessary environmental cleanup actions are completed.

Site Responsibility

The OMC site is being addressed through a combination of federal, state, and potentially responsible party (PRP) actions.

Threats and Contaminants

Sediment in Waukegan Harbor is contaminated with polychlorinated biphenyls (PCBs), although at much lower levels than in previous years due to the cleanup action that OMC completed in the early 1990s (see next section - Cleanup Progress). PCBs are chlorinated hydrocarbons and are a potential human carcinogen (may cause cancer) and can also cause non-carcinogenic effects such as developmental delays, immune deficiencies, and thyroid problems. PCBs do not easily biodegrade and can bioaccumulate in people or animals that are exposed to them.

Today, harbor sediment PCB levels average less than 0.2 mg/kg ("parts per million" or ppm). Past data suggested that higher levels of PCBs in the sediment were affecting benthic organisms as well as bioaccumulating in fish living in the harbor waters. Humans could be exposed to PCBs by consuming fish caught in the harbor that have stored PCBs in their fatty tissues. The State of Illinois monitors PCB levels in harbor fish on a yearly basis and a fish consumption advisory is now in effect.

Soil at the WCP site is contaminated with PAHs such as coal tar and creosote and with arsenic. Groundwater is contaminated with ammonia, arsenic, phenol, and benzene. Certain PAHs are carcinogens and others are not, yet they can cause non-carcinogenic health effects. Arsenic is a poison in high doses and a potential human carcinogen through prolonged exposure to much lower amounts (although it may also be an essential micro-nutrient). Humans could be exposed to the soil contaminants by accidental contact or ingestion and to the groundwater contaminants by ingestion.  However, the WCP site is fenced to prevent casual contact with soil contaminants and the city will not allow anyone to legally use the groundwater as a source of potable water.

OMC Plant 2 was legally abandoned by the OMC bankruptcy trustee in December 2002.  Site soil is contaminated with PCBs above 1 ppm. Groundwater and soil beneath the plant building is contaminated with various chlorinated volatile organic compounds (VOCs), including TCE and vinyl chloride, both of which are carcinogens. Humans could be exposed to the soil contaminants by accidental contact or ingestion and to the groundwater contaminants by ingestion. The OMC Plant 2 site is fenced to prevent casual contact with soil contaminants, and the city will not allow anyone to legally use the groundwater as a source of potable water.

The PCB containment cells were constructed by OMC in 1990-1993 to hold the contaminated sediment that OMC had dredged from the northern Waukegan Harbor area. The cells contain PCBs at levels above 50 ppm to as high as 5000 ppm. They are covered with a low permeability soil layer and are inspected and maintained by the city of Waukegan. If the covers were to fail, humans could be exposed to PCBs in the stored soil by direct contact or ingestion.

Cleanup Progress

Waukegan Harbor (OU #1): EPA and OMC entered into a consent decree in 1989 requiring OMC to clean up PCB-contaminated sediment in Waukegan Harbor and portions of its OMC Plant 2 property that had PCB-contaminated soil. OMC began work in 1990, dredging contaminated sediment from the northern harbor area and excavating some OMC Plant 2 area soils to achieve a PCB cleanup level of 50 ppm. Some of the sediment was thermally treated on site to distill off the PCB oils so that the oil could be sent off site for destruction. The rest of the sediment and excavated soils were placed into three containment cells - one was constructed in former harbor Boat Slip #3 and two were placed on the north side of the Plant 2 property. OMC installed groundwater extraction wells within the PCB containment cells so that an inward groundwater gradient would be established in case of cell wall failure. All construction was completed by 1994 at an estimated cost to OMC of $21 million. OMC operated and maintained the PCB containment cells until shortly after it declared bankruptcy in 2000.  EPA, and then Illinois EPA, took over the maintenance work on the PCB containment cells after OMC ceased performing this work. The city of Waukegan is now performing the cell maintenance work in accordance with an agreement with EPA and Illinois EPA.

EPA, Illinois EPA, and area stakeholders evaluated a second cleanup action for Waukegan Harbor because PCB levels in harbor-caught fish still are too high to be protective of human health. EPA released a proposed cleanup plan on November 3, 2008 for public comment. EPA also held a public meeting in November to present the plan and take public comments on the proposal. The proposal was to again dredge the harbor sediment, but this time the target PCB cleanup level would be 1 ppm. The sediment was to be placed in an on-site consolidation facility (CF) constructed for this purpose on the OMC Plant 2 site. A thin residual mixing layer of clean sand would be placed in the harbor once dredging was completed to achieve a surface-weighted average concentration of 0.20-0.25 ppm PCBs in the sediment. EPA issued a cleanup decision (Record of Decision (ROD) Amendment) on October 30, 2009. The cost to clean up the harbor the second time is estimated at about $48 million.

After completing the remedial design phase in 2011, EPA completed construction of a water treatment plant and consolidation facility (CF) for the dredged sediment in September 2012. The first season of harbor sediment dredging began on September 26, 2012, and continued until November 10, 2012, when the work was halted due to winter conditions. The second and and final dredging season began on April 1, 2013, and concluded on July 17, 2013. Due to the low levels of residual PCBs in the harbor after dredging was completed, placement of the planned clean sand mixing layer was not necessary, except in areas near the seawalls where no dredging was performed. Placement of a cap over some areas of contaminated sediment located too close to the harbor seawall for dredging was completed in December 2013. Reconstruction of the North Marina, which was partially removed for dredging, was completed in January 2014. In late September 2014, all treatment plant and other dredging-related equipment was removed from the site and the soil cover over the CF was completed. Illinois will continue to monitor PCB levels in harbor fish on an annual basis. In early 2015, the City of Waukegan demolished the building used for the dredging water treatment plant. EPA will now excavate contaminated concrete and soil associated with the building, for offsite disposal. That work is planned for late July and August 2015.

Waukegan Coke Plant (OU #2): During the 1990-1993 harbor cleanup, OMC excavated and constructed harbor Boat Slip #4 because former harbor Boat Slip #3 was converted into a PCB containment cell. In the course of excavating the new boat slip, creosote-contaminated soils were discovered. This led to the discovery of the Waukegan Coke Plant (WCP) site directly to the south of harbor Boat Slip #4. Later, EPA and the North Shore Gas Company (NSG), a former site owner, entered into an administrative order on consent for the completion of a remedial investigation and feasibility study (RI/FS) at the WCP site. The RI was completed in February 1995 and a final FS was released in November 1998.

EPA issued a ROD on September 30, 1999 that called for the cleanup of the WCP site soil and groundwater. EPA determined that soil contaminants should be cleaned up to commercial/industrial re-use levels (because site-owner OMC was still operating at the time) and groundwater be restored to drinkable status. Accordingly, soil would be excavated and disposed of or treated to remove arsenic and PAHs. Groundwater would be pumped and treated to remove high levels of ammonia, benzene, arsenic, and phenol and then would be subjected to a monitored natural attenuation (MNA) approach until final cleanup levels were met. This work was estimated to cost $27 million to conduct.

NSG and General Motors Corporation (GM), another site PRP, began the soil cleanup action in November 2004 and completed it in November 2005. Thousands of tons of arsenic- and PAH-contaminated soil were trucked off site for disposal in area landfills.  Some of the more tarry material was trucked to Utah and Pennsylvania for disposal in co-burning facilities used to generate electricity. After all excavations were completed and testing was done to show that cleanup levels had been reached, backfill material was placed into the excavations and a 6- to 10-inch clean top soil layer was placed over the site. The city of Waukegan now maintains the surface of the property.

NSG and GM completed the groundwater cleanup action design plans and specifications in 2006 and began construction of the water treatment system in April 2007. Construction of the plant was completed in fall 2008 and pumping and treating of contaminated groundwater then began. It was estimated that the active groundwater action would run for as much as 8 years (until 2016) before it could be shut down; however, NSG and GM were able to efficiently run the treatment plant so that on June 1, 2011, the pumps were shut down and treatment plant decommissioning began. EPA estimates that over 36,000,000 gallons of groundwater were pumped and treated at the WCP site. A very long period of groundwater monitoring will now occur until cleanup levels are met. NSG, working with EPA and Illinois EPA, developed a work plan for long-term groundwater monitoring. NSG is now implementing that monitored natural attenuation (MNA) work plan by periodically sampling monitoring wells installed in May 2012 on and near the WCP property. (Note: due to GM's bankruptcy, that company is no longer directly involved in the site cleanup actions.)

In 2014, the U.S. Army Corps of Engineers completed plans to dredge 100,000 cubic yards of clean sediment from the Outer Harbor area of Waukegan Harbor and place the sediment on the Waukegan Coke Plant portion of the OMC Site. Dredging began in spring 2015 and will be completed by the end of that year.

PCB Containment Cells (OU #3): The city of Waukegan signed an agreement with EPA in 2005 to assume routine operation and maintenance of the PCB containment cells until at least 2012. In 2015, EPA plans to develop a more far-ranging agreement to cover future maintenance of the cells. To date, monitoring information shows that the cells are robust and no leaks have occurred. As previously mentioned, the CF located between the two existing cells on the north side of Plant 2 (OU #4), was constructed to hold the harbor sediment that was dredged in 2012-2013. Placement of a cap on the CF was completed in September 2014.

OMC Plant 2 (OU #4): Before the OMC Plant 2 site was abandoned by the OMC bankruptcy trustee in 2002, EPA and Illinois EPA reached an agreement with the trustee whereupon the trustee would perform some immediate cleanup actions inside the plant under EPA's oversight. These actions included the removal of certain waste chemicals and the cleanup of some PCB-contaminated machinery. After the trustee completed its work, EPA performed additional interior cleanup actions under its removal authority to prevent the release of PCBs and other compounds into the environment. EPA completed this work in spring 2003.

In 2006, EPA completed a RI/FS report that identified four media of concern at the site - the PCB-contaminated OMC Plant 2 building, PCB- and PAH-contaminated soil and sediment, TCE-contaminated groundwater, and a pool of free product (called "dense nonaqueous phase liquid" or DNAPL) comprised of TCE under the ground. The city of Waukegan had also conducted soil sampling along the lakefront dunesland area in fall 2005, using Brownfields grant monies, and reported that it found a sand sample near one of the PCB containment cells that read 14,000 ppm PCBs. EPA then began a removal action in January 2006 in the dunes area near the containment cell. EPA excavated over 6,000 cubic yards of sand containing 10 ppm to 14,000 ppm PCBs and disposed of the sand off-site.

EPA released a cleanup proposal for the building, soil, and sediment in January 2007 for public comment and we simultaneously began a pilot scale study of innovative means to clean up the groundwater and DNAPL. Also in January 2007, EPA undertook a final removal action at the OMC Plant 2 facility to dispose of about 25 PCB-containing electrical transformers to prevent vandals from breaking the transformers open and dispersing PCBs into the environment. EPA also removed an extensive amount of copper wire and electrical connectors from the plant to reduce the incentive for scavengers to break into the facility and expose themselves to PCB contamination while scavenging for copper.

EPA issued a ROD in September 2007 that called for the PCB-contaminated OMC Plant 2 building to be demolished and the debris disposed of off site. The ROD also called for the excavation and off site disposal of soil and sediment at contaminant levels above 1 ppm PCB and 2 ppm PAHs. 

Separately, EPA had notified the city of Waukegan in February 2006 that portions of the OMC Plant 2 building were not contaminated. Accordingly, in November 2006, the city completed demolition of the clean portions of the facility down to the concrete foundations. In fall 2008, the city completed the removal of the concrete foundations.

Utilizing funding under the American Recovery and Reinvestment Act (ARRA), EPA completed building demolition and asbestos abatement in April 2011, except for the Triax Building, which was used to house groundwater treatment systems, with many tons of debris disposed off-site in approved facilities. About 5000 tons of steel was recovered - most of which was recycled locally and some was sent to a landfill for disposal. PCB-contaminated concrete foundations were removed next and contaminated soil was excavated and disposed of off site. Contaminated sediment was also excavated from on- and off-site portions of a drainage ditch (the "North Ditch") located on the north end of the OMC Plant 2 area. Additional contaminated dune sand was also excavated for off-site disposal. In some areas EPA was unable to excavate all contaminated soil to designated cleanup levels. Those areas will be covered with three-feet of clean fill in summer 2015. An Explanation of Significant Differences is being generated to document that change to the site remedy.

Clean up of contaminated soil and sediment at OU 4 is nearly complete, in accordance with the 2007 ROD, except for the remaining Triax Building area and some other areas where the planned cleanup needed to be modified. Because EPA was unable to excavate areas of buried utilities and deep soil contamination at the former Old Die Cast Building (ODC) area, an amendment to the 2007 ROD was completed in December 2012 for the construction of a containment cell, similar in construction to existing site cells, in that portion of OU4. Construction of the ODC cell began in Spring 2014. Currently, the ODC Cell is complete except for the placement of a vegetative cover and placement of asphalt cover over the utilities areas, which is planned for summer 2015. Additionally, a storm sewer that enters the OMC property from the west and then travels north to North Ditch will be modified during the summer of 2015 to add a liner to prevent residual onsite contaminants from entering that drain.

The North Ditch area had PCB contamination below the designated excavation depth and soil contamination was located too close to the eastern PCB containment cell for excavation, so cleanup in these areas was modified through a July 2, 2012 Explanation of Significant Differences (ESD). The ESD resulted in engineered caps for these areas.  Remediation of the North Ditch is complete.

EPA released a second proposed cleanup plan covering the groundwater contamination and TCE DNAPL in August 2008. EPA proposed to enhance the naturally-occurring in situ ("in place") bacterial degradation of the dissolved organic solvents in five identified contaminant plumes by adding a soluble food. This would allow the "solvent-eating" bacteria to greatly reduce the levels of dissolved solvents in the water. Separately, a pure TCE DNAPL plume would be destroyed using soil-mixing machinery to add specially-made iron filings into the TCE that would act to reductively dechlorinate (destroy) the hydrocarbon solvent. Later, EPA would monitor groundwater conditions until contaminant cleanup levels are met (in about 10-20 years). Also, because some contaminated groundwater flows off site towards Waukegan Harbor, EPA would install an air sparge curtain system along the southern property line to remove dissolved solvents from the water as it flows off site. The air sparge unit would release an underground "curtain" of air bubbles into the groundwater and the bubbles would help to move the dissolved contaminants from the water to the air bubbles, which then discharge to the ground surface and then to the atmosphere.

EPA issued a ROD for the groundwater remedy and DNAPL cleanup actions in February 2009. The air sparge curtain system was installed in September 2011 and Illinois EPA currently operates the system. Mixing of the iron filings into the TCE DNAPL soils was completed in December 2011. Groundwater bioremediation was replaced with the injection of an aggressive in-situ chemical oxidizer (ISCO) into one of the five identified TCE plumes because its location interfered with the location of the consolidation facility in which dredged harbor sediments from 2012-13 were placed. ISCO injection was then selected as the preferred method of groundwater treatment in all of the identified plumes. ISCO injection was completed in July 2014. A site-wide monitoring well network was sampled in April, September, and December 2014. EPA and Illinois EPA are evaluating the results to determine if additional actions are warranted beyond continued monitoring.

Success Story

The soil cleanup was completed at the WCP site in 2005.  Much of the surface of the property is now available for redevelopment. Off-site dune areas have been cleaned and restored.  With the exception of some areas that may need alternate clean-up plans, most of the contaminated soil and sediment has been removed from OU 4.

EPA completed several removal actions at the OMC Plant 2 site to remove immediate environmental hazards while residual contaminant level studies are underway.

Harbor dredging was completed in July 2013, more than one month ahead of schedule.  Residual concentrations of PCBs in the harbor were low enough that the placement of a mixing sand layer was not necessary.

Community Involvement

The Waukegan Citizens' Advisory Group (CAG) has been tracking cleanup progress in the Waukegan Harbor area for many years. This group of concerned citizens and area business and municipal representatives meets once a month to discuss local environmental issues and to lend support to the harbor cleanup efforts.

EPA worked with the CAG and 5th-grade students of Waukegan School District 60 to design and produce colorful signs to convey a fish consumption advisory for the harbor.  We posted these signs at the harbor and at the beachfront in early 2011.

During 2013 EPA conducted several OMC site tours for local community and school groups.  EPA also made presentations to all of the Waukegan High School Environmental classes on the OMC site during 2013. 

Congressional Interest

Representatives from Congressman Dold's office as well as both Illinois Senators have shown active interest in progress in the site, as has the Governor's office.

Property Reuse

The city of Waukegan has targeted most of the OMC site for redevelopment as soon as cleanup actions are completed. The city hopes to build a mixed-use development on the properties, including condominiums, shops, and marine-based service businesses.  At this time, the surface of most of the WCP site is available for redevelopment and a small part of the OMC Plant 2 site could be redeveloped as well. However, EPA understands that the city plans to wait until the entire property is ready for re-use before commencing redevelopment work.


Remedial Project Manager, U.S. EPA
timothy drexler (drexler.timothy@epa.gov)
(312) 353-4367

Community Involvement Coordinator, U.S. EPA
heriberto leon
(312) 886-6163




Site Profile Information

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


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