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WPSC Manitowoc MGP Site

Site Information
Contact Information

Community Involvement Coordinator
Susan Pastor (pastor.susan@epa.gov)
312-353-1325 or 800-621-8431, ext. 31325

Remedial Project Manager
Margaret Gielniewski
312-886-6244 or 800-621-8431, ext. 66244


(where to view written records)

Manitowoc Public Library
707 Quay St.
Manitowoc, WI


The 4-acre Wisconsin Public Service Corp. site is located in Manitowoc, Wis.  Currently, the majority of the site is occupied by actively used commercial buildings and asphalt parking lots. Residential, commercial and industrial-use properties are found in the vicinity. The Manitowoc River borders the site on the northwest.

WPSC owned and operated a gas plant from before 1900 to the late 1940s in an area that was historically industrial. Processes included coal carbonization and carbureted water gas. WPSC still owns the site today.

Various investigations and cleanups took place from 1988 to 1994 under Wisconsin Department of Natural Resources oversight. This includes the excavation, removal and in-place treatment of highly contaminated soil between the WPSC building and Manitowoc River. Routine groundwater monitoring occurs annually.

A Community Advisory Group (CAG) is one way the community can get involved. Learn more about CAGs

Site Updates || Technical Documents || Legal Agreements

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Site Updates

May 2015

The results from groundwater and soil samples are included in a document called a remedial investigation report.  Last year, contractors collected groundwater samples from the existing monitoring well network by opening up the wells and drawing samples using a mechanized water pump. They also took soil gas samples nearby and inside a building on property where former MGP structures once stood. This involved drilling quarter-sized holes up to 2 feet into the ground and inserting thin plastic hoses to collect samples over a 24-hour period. 

Vapor intrusion may be present in a building erected over an area where the former gas plant once stood.  This occurs when gases, or vapors, rise up through the ground.  In this case, more information was gathered to see if groundwater polluted with PAHs has turned into a gas and is looking for an easy escape route through building slabs, concrete floors, basements, or crawl spaces. High levels of PAH gas may cause adverse health effects but are easily addressed with the installation of basketball-sized “mitigation systems.” However, if WPSC buys the building from the current owner, it will be torn down so contamination under the building can be cleaned up.

Another document, called the feasibility study report, will list several possible ways to clean up on-site groundwater and soil, river sediment and possibly harmful vapors in the building.  When the report is completed in early 2016, the public will be able to comment on all of the cleanup options as well as EPA’s recommendations.

WPSC/Intregrys is funding and conducting all of the work under EPA oversight.

Plans to investigate sediment, groundwater and soil at six MGP sites began after a legal agreement called a consent order was signed between WPSC and EPA in May 2006. This agreement allows for further investigation to determine how much contamination remains at the Manitowoc site.

The 2006 agreement also includes five other MGP sites in Green BayStevens PointMarinetteOshkosh, and Two Rivers, Wisconsin. A separate agreement for another site, WPSC Campmarina MGP in Sheboygan, was signed between WPSC and EPA in January 2007.

Technical Documents

Manufactured Gas Plants (MGPs)

Learn about MGPs

EPA Region 5 is working on former MGPs in Wisconsin and Illinois.

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Legal Agreements

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