background and lessons learned managers meeting february 13, 2014

General Mills/Henkel Corp. Superfund Site Background and lessons learned Managers Meeting February 13, 2014

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General Mills/Henkel Corp. Superfund Site

Background and lessons learned

Managers MeetingFebruary 13, 2014

Chemical Disposal 1947-19621947 Aerial Photo

Former General Mills Facility2010 East Hennepin Avenue

Minneapolis

Page 3: Background and lessons learned Managers Meeting February 13, 2014

Generalized Groundwater Contamination

Water Table

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=PAN4iZQ6S_2aTM&tbnid=wH864hG9WLyynM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.nyruralwater.org%2Fpublications%2Fwinter2000%2FSWWinter00.cfm&ei=WtT_Ut_tKYGirgGVmICoAg&bvm=bv.61535280,d.aWc&psig=AFQjCNFzywubP0mohFCG1Fcw4zMGzr7SdQ&ust=1392584130153643

Page 4: Background and lessons learned Managers Meeting February 13, 2014

Groundwater Contamination

Page 5: Background and lessons learned Managers Meeting February 13, 2014

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

Page 6: Background and lessons learned Managers Meeting February 13, 2014

Soil Gas Investigation 2012-2013

Page 7: Background and lessons learned Managers Meeting February 13, 2014

Generalized Vapor Intrusion

Dissolved contamination in groundwater

Page 8: Background and lessons learned Managers Meeting February 13, 2014

November 6, 2013 Mailing to Residents

Page 9: Background and lessons learned Managers Meeting February 13, 2014

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

Page 10: Background and lessons learned Managers Meeting February 13, 2014

Sub-slab Sampling

Page 11: Background and lessons learned Managers Meeting February 13, 2014

Building Mitigation

Page 12: Background and lessons learned Managers Meeting February 13, 2014

Current Status

Page 13: Background and lessons learned Managers Meeting February 13, 2014

Current StatusSub Slab Sampling

• XX properties sampled

Sub Slab Sampling Results

• XX properties over 20ug/m3

Mitigation Systems

• XX mitigation systems installed

Page 14: Background and lessons learned Managers Meeting February 13, 2014

Additional Remedial Actions

• Roadmap figure

Page 15: Background and lessons learned Managers Meeting February 13, 2014

Questions & Discussion

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