WPSC Manitowoc MGP Site
Community Involvement Coordinator
Susan Pastor (firstname.lastname@example.org)
312-353-1325 or 800-621-8431, ext. 31325
Remedial Project Manager
312-886-6244 or 800-621-8431, ext. 66244
(where to view written records)
Manitowoc Public Library
707 Quay St.
What You Should Know About Vapor Intrusion (PDF) (2pp, 232K)
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.
You will need the free Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
Ground water and soil samples are being collected as part of a study called the remedial investigation. Contractors have been collecting 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 the nearby buildings. This occurs when vapors rise up through the ground. In this case, more information is being 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.”
WPSC, the company determined to be responsible for the contamination, surveyed the terrain and contours of the land under the Manitowoc River in December 2011. A year later, contractors also took sediment samples to get a better idea of where PAH contamination is located. Results from the 2011 survey and the 2012 sediment samples were used to develop a more detailed river sampling plan.
WPSC/Intregrys is funding and conducting all of the work under EPA oversight.
Plans to investigate sediment, ground water 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 Bay, Stevens Point, Marinette, Oshkosh, and Two Rivers, Wisconsin. A separate agreement for another site, WPSC Campmarina MGP in Sheboygan, was signed between WPSC and EPA in January 2007.
Manufactured Gas Plants (MGPs)
EPA Region 5 is working on former MGPs in Wisconsin and Illinois.
- Community Involvement Plan, July 2008 (PDF) (14pp, 1K)
- Completion Report (PDF) (386pp, 21.7MB) July 25, 2007
- ATSDR's Health Consultation Health Consultation (PDF) (11pp, 35K) March 2005
- Administrative Settlement Agreement and Order on Consent for Remedial Investigation and Feasibility Studies (PDF) (89pp, 8.8MB) April 2006