April 10, 2018

CERTIFIED MAIL 7017 0660 0000 9421 77 54

Jack Schinderle, Division Director Waste Management and Radiological Protection Division Michigan Department of Environmental Quality P.O. Box 30241 Lansing, MI 48909

The Dow Chemical Company Michigan Operations

Midland, Ml 48674

APR l2 2018

cc: Dan Dailey, MDEQ-WMRPD, P.O. Box 30241, Lansing, MI 48909 Trisha Confer, MDEQ-WMRPD, 401 Ketchum St, Suite B, Bay City, MI 48708

THE DOW CHEMICAL COMPANY- MID 000 724 724, WASTE STORAGE AREA I (WSA I) DIKE SOUTHEAST END CONCRETE REPLACEMENT- MINOR MODIFICATION REQUEST

In accordance with R 299.9519(5) of the administrative rules promulgated pursuant to Part 111, Hazardous Waste Management, ofNREPA, 1994 PA 451, as amended, Dow Chemical (Dow) is requesting approval of a minor modification to the Operating License to replace the southeastern portion of the WSA I dike to improve the condition of the concrete.

The condition of the portion of the WSA I concrete dike southeast of 1143 building is deteriorating and the annual costs for maintaining it are high. Due to the condition, Dow has been spending a significant amount of money every year on repairs to the dike. In 2016, the section surrounding 1143 Building was replaced (Amendment #4). This project will replace the remaining concrete southeast of 1143 Building.

The proposed activities associated with this request include: replacing the current 8" slab with a 12" slab, adding a layer of gravel underneath the concrete, adding a layer of insulation in between the gravel and concrete. The dike size will remain the same. Attached are the following supporting documents: 1.) aerial view of WSA I showing the proposed portion of the dike to be replaced; 2.) dike replacement demo plan; 3.) dike replacement slab plan, and 4.) dike replacement slab cross sections and details.

If you have any questions regarding this information, please contact Brad Kischnick (989) 638-9602.

st~ Scott Bemis Responsible Care Leader Environment, Health and Safety 1790 Building, Washington Street Midland, MI 48674

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GENERAL NOTES:

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2. REBAR: ASTH A615 160,mm psal.

3. ALL CONCRETE TO HAVE SYNTHETIC FIBER REINFORCEHEtlT.

4. PROVIDE 12' DEEP 6AA STOUE OR CRUSHED CotiCRETE ICOHPACTEO TO 95% HAX. OEUSITYI UNDER COUCRETE SOG. SLAB SHALL BE POUR£0 USING Tl-£ CHECKERBOARD METHOD.

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