General MillsHenkel Corp Superfund Site Background and lessons
General Mills/Henkel Corp. Superfund Site Background and lessons learned Managers Meeting February 13, 2014
Chemical Disposal 1947 -1962 1947 Aerial Photo Former General Mills Facility 2010 East Hennepin Avenue Minneapolis
Generalized Groundwater Contamination Water Table
Groundwater Contamination
Soil and Groundwater Cleanup • 1981“absorption pit” removed addressing the soil contamination. • 1984 Response Order by Consent between MPCA and General Mills • 1985 Extraction and Treatment of Contaminated Groundwater began. • 2010 Groundwater system turned off. TCE concentrations below the cleanup concentrations established in the Consent Order
Soil Gas Investigation 2012 -2013
Generalized Vapor Intrusion Dissolved contamination in groundwater
November 6, 2013 Mailing to Residents
Public Involvement • Two Public Meetings November 12, 2013 • Five Community Group Meetings • “Office hours” sessions • MPCA Project website • E-mail distribution list for interested parties • Widely covered in local media
Sub-slab Sampling
Building Mitigation
Current Status
Current Status Sub Slab Sampling • XX properties sampled Sub Slab Sampling Results • XX properties over 20 ug/m 3 Mitigation Systems • XX mitigation systems installed
Additional Remedial Actions • Roadmap figure
Questions & Discussion
- Slides: 15