MPCA Citizens’ Board Information Item February 25, 2014

Chemical Disposal Former General Mills Facility 2010 East Hennepin Avenue Minneapolis

Generalized Groundwater Contamination Water Table

Generalized Vapor Intrusion Dissolved contamination in groundwater

Groundwater Contamination

Soil Gas Investigation

Public Involvement Two Public Meetings November 12, 2013 Five Community Group Meetings “Office hours” sessions MPCA Project website distribution list for interested parties Widely covered in local media

Sub-slab Sampling

Building Mitigation

Current Status as of 2/19/14

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

Additional Remedial Actions

Questions & Discussion

Soil and Groundwater Cleanup 1981“absorption pit” removed addressing the soil contamination Response Order by Consent between MPCA and General Mills 1985 Extraction and Treatment of Contaminated Groundwater began Groundwater system turned off. TCE concentrations below the cleanup concentrations established in the Consent Order

November 6, 2013 Mailing to Residents