Post on 14-Dec-2015
transcript
General Mills/Henkel Corp. Superfund Site
MPCA Citizens’ BoardInformation Item
February 25, 2014
Chemical Disposal 1947-1962
Former General Mills Facility2010 East Hennepin Avenue
Minneapolis
Generalized Groundwater Contamination
Water Table
Generalized Vapor Intrusion
Dissolved contamination in groundwater
Groundwater Contamination
Soil Gas Investigation 2012-2013
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 as of 2/19/14
Current StatusSub-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
Additional Remedial Actions
Questions & Discussion
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
November 6, 2013 Mailing to Residents