Cedar Creek Site
Community Involvement Coordinator
Susan Pastor (email@example.com)
312-353-1325 or 800-621-8431, ext. 31325
Remedial Project Manager
Scott Hansen (firstname.lastname@example.org)
312-886-1999 or 800-621-8431, ext. 61999
Assistant Regional Counsel
Richard Nagle (email@example.com)
312-353-8222 or 800-621-8431, ext. 38222
Wisconsin DNR State Project Manager
(where to view written records)
Cedarburg City Hall
W63 N645 Washington Ave.
Cedarburg Public Library
W63 N583 Hanover Ave.
The Cedar Creek site is in the historic city and township of Cedarburg (Ozaukee County) in southeastern Wisconsin in a suburban residential area north of Milwaukee. The entire site consists of Mercury Marine's Plant 2 and the segment of Cedar Creek from below the Ruck Pond dam to the point where it meets the Milwaukee River. This segment includes open stretches of creek as well as areas known as Columbia Pond, Wire and Nail Pond, and the former Hamilton Pond for a total of 5.1 creek miles. The Milwaukee River is currently not part of the Cedar Creek site and is under the jurisdiction of the Wisconsin Department of Natural Resources. For EPA to address the contamination in the Milwaukee River, WDNR needs to propose and list it under the Agency's National Priorities List as a separate Superfund site. Or, WDNR could work on the river under its own Natural Resources Trustee authority.
PCBs from boat manufacturer Mercury Marine contaminated Cedar Creek and the Plant 2 property. It operated a plant on St. John Avenue from 1951 to 1982. Fluids, containing PCBs, leaked from equipment and were washed into floor drains. These drains emptied into storm sewers. Those sewers emptied into Ruck Pond on the creek and flowed into the Milwaukee River.
Mercury Marine's Plant 2 building was demolished in May 2005. The building, which was in poor condition, also contained PCB contamination. An investigation and feasibility study outlining possible cleanup options was completed in October 2007. A decision on how to clean up Plant 2 was made in March 2008.
Another likely source of contamination in the area was Amcast, a former local automotive industry supplier in Cedarburg. It also had a plant that may have emptied PCBs into the creek via storm sewers. One of them apparently emptied into Hamilton Pond, upstream of Green Bay Road. Due to heavy rains and high creek flow in 1996, the Hamilton Dam collapsed and was removed. The pond was drained leaving behind several acres of mud flats containing PCBs.
Sewers near the Amcast plant and soil under the building were sampled in November 2005. Since Amcast had filed for bankruptcy, its contractor was told to stop working and the results were never analyzed. Soil samples were also taken on private properties near the Amcast plant in summer 2005. Some of those samples showed PCB contamination slightly above what EPA considers to be safe levels.
Since the company is bankrupt, the Amcast portion of the project was separated from Cedar Creek in 2009. EPA is using Superfund money to address the contamination at and near Amcast Industrial Corp.
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What are PCBs?
PCBs, polychlorinated biphenyls, are toxic chemicals that were once widely used as industrial coolants, insulators and lubricants. PCBs can concentrate in the environment and the food chain, resulting in health hazards to people, fish and wildlife. Because of these dangers, the U.S. government banned the manufacture of new PCBs in 1976. PCBs still in use are strictly regulated.
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The site is divided into two separate projects:
Cedar Creek is being studied by Mercury Marine. The company’s contractor is taking sediment and soil samples on private properties along the creek to help determine design criteria for the upcoming “removal action.” EPA also expects Mercury Marine to remove PCB-contaminated sediment in Columbia Pond and Wire and Nail Pond in spring 2015. Plans for this “removal action” are outlined in a September 2014 document called an approval memorandum. Another document called an engineering evaluation/cost analysis (EE/CA) will follow in late 2014 which will outline the actual cleanup plan. The “EE/CA” should be available for public review and comment by early 2015.
Plant 2 was separated from the rest of the site under a 2002 legal agreement between EPA and Mercury Marine because, at the time, the company was farther along with its Plant 2 studies. Both believed it was important to finalize a cleanup plan as soon as possible for this source of contamination into Cedar Creek.
The Plant 2 site was cleaned up in 2013. Mercury Marine removed PCB-contaminated concrete slabs and soil from the property. The company brought heavy equipment onto the site to dig up the slabs and soil which were stored on-site and trucked it all to a licensed facility for proper disposal. The contamination came from fluids that leaked into floor drains during the manufacturing process.
The cleanup plan is described in a March 2008 document called the "record of decision." Mercury Marine is currently looking for someone to redevelop the Plant 2 site.
EPA and Wisconsin Department of Natural Resources continue to oversee Cedar Creek and Plant 2 under the federal Superfund law.
- EPA picks cleanup plan for Cedarburg, Wis., Superfund site Apr. 3, 2008
- EPA proposes cleanup plan for Cedarburg, Wis., Superfund site; comment period begins, meeting Oct. 10 Oct. 3, 2007
- EPA Proposes Cleanup Plan for Former Cedar Creek Plant 2 Site (PDF) (8pp, 694K) October 2007
- New Legal Agreement May Get Cleanup Back on Track (PDF) (2pp, 499K) November 2006
- Cedar Creek Studies Begin (PDF) (4pp, 529K) July 2003
- Engineering Evaluation/Cost Analysis Approval Memo (PDF) (234pp, 694KB) August 2014
- Remedial Investigation (RI) Report, Cedar Creek (tables/figures not included) (PDF) (234pp, 901KB) May 2012
Appendices - These documents are very large, so rather than post them on this web page, please visit the local site information repositories to review them or contact us and we will send you copies on CD/DVD.
- Remedial Design Plant 2 (PDF) (546pp, 19.4MB) February 2012
- Remedial Investigation (RI) Report, Plant 2 (PDF) (240pp, 968K) October 2007
- Alternatives Document/ Focused Feasibility Study Report (PDF) (64pp, 1.3MB) October 2007
- Cedar Creek Community Involvement Plan (PDF) (11pp, 118K) September 2002
- Surface Water Data (PDF) (2pg 240KB) 1994-95
- Summary of Pesticides/PCBs results (PDF) (3pg, 203KB) Septmeber 1993
- Water Column PCBs and Suspended Soilds Raw Data (PDF) (10PG, 1.38MB) June 1993
- Administrative Settlement Agreement and Order on Consent for a Non-Time-Critical Removal (PDF) (31pp, 1.8mB)August 2014
- Remedial Action Consent Decree (PDF) (165 pp, 5.3MB) Nov. 27, 2012
- Administrative Settlement Agreement & Order on Consent (AOC) for RI/FS - Mercury Marine (PDF) (67pp, 4.1MB) March 2008
- Record of Decision - Cedar Creek OU1, Plant 2 Site (PDF) (55pp, 303K) March 2008
- Administrative Order On Consent For Remedial Investigation - Cedar Creek, Amcast Industrial Corp. (PDF) (34pp, 113K) October 2002
- Cedar Creek Administrative Order for Mercury Marine (PDF) (71pp., 3.1MB) 2002
- Cedar Creek Plant 2 Site Public Meeting Transcript (PDF) (80pp, 93K) October 2007