Proposed Cleanup Plan for the Former Tonka Main Plant Site

Hasbro Inc. (which now owns the Tonka Corporation) is proposing to clean up groundwater contamination at the former Tonka main plant site in Mound, Minnesota, by creating a wetland in the small channel that leads to Harrison Bay of Lake Minnetonka. This area was originally a wetland prior to the early 1900s. All of this work will be completed under the direction of the Minnesota Pollution Control Agency (MPCA). Before the MPCA approves the plan, however, it invites the public to send in comments by August 30, 2000, to Nile Fellows at the MPCA Metro District, 520 Lafayette Road, St. Paul, Minnesota, 55155. Tonka started to investigate soil and ground water near its plant in 1985. Although the company did not find significant soil contamination, it did find two areas where ground water was impacted by volatile organic compounds (VOCs). These areas were designated the west plume and the north plume. Because of this contamination, the MPCA added the Tonka site to the state Superfund list in 1985. In 1986, Tonka cleaned up storm sewer lines that contained paint residues. The company then worked with the state to conduct more ground-water investigations. The primary chemicals of concern in the west and north plumes are trichloroethylene (TCE), a solvent used for cleaning metal parts prior to painting, and by-products from microbial degradation of TCE, such as cis-01,2- dichloroethylene (DCE) and vinyl chloride.
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Minnesota Water Research Digital Library
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