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General Mills/Henkel Corp. Superfund Site

General Mills/Henkel Corp. Superfund Site. MPCA Citizens’ Board Information Item February 25, 2014. Chemical Disposal 1947-1962. Former General Mills Facility 2010 East Hennepin Avenue Minneapolis. Generalized Groundwater Contamination. Water Table. Generalized Vapor Intrusion.

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General Mills/Henkel Corp. Superfund Site

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  1. General Mills/Henkel Corp. Superfund Site MPCA Citizens’ Board Information Item February 25, 2014

  2. Chemical Disposal 1947-1962 Former General Mills Facility 2010 East Hennepin Avenue Minneapolis

  3. Generalized Groundwater Contamination Water Table

  4. Generalized Vapor Intrusion Dissolved contamination in groundwater

  5. Groundwater Contamination

  6. Soil Gas Investigation 2012-2013

  7. 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 inlocal media

  8. Sub-slab Sampling

  9. Building Mitigation

  10. Current Status as of 2/19/14

  11. Current Status Sub-slab Sampling • 236 properties sampled Sub-slab Sampling Results • 126 properties over 20 ug/m3 Mitigation Systems • 56 installed and verification testing complete • 30 installation process begun

  12. Additional Remedial Actions

  13. Questions & Discussion

  14. November 6, 2013 Mailing to Residents

  15. 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

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