January 

DEQ/Dow Framework (1/20/2005)    

February 

March 

April 

May 

DEQ Requests to Dow for information and documents concerning the release of dioxins, furans, and other hazardous constituents from Dow's Midland Facility 

• May 6, 2005 Formal Information Request  
• May 10, 2005 Follow-up Information Request and Attachment  

Received by the DEQ from Dow on May 17, 2005 

• May 16, 2005 Submittal Letter 
• Work Plan for Future Study 
• Tittabawassee River Floodplain Scoping Study Work Plan (May 2005, CH2M Hill) 
• Reports and Work Plan for Completed Studies 
• Ecological Risk Assessment Support Sampling (March 2005, CH2M Hill) 
• Tittabawassee River Sediment Dioxin/Furan Concentration Variability (March 2005, CH2M Hill) and
  Appendix C 
• Probing and Coring Study for Characterization of Sediment Type and Thickness of Unconsolidated Deposits, Tittabawassee River (November 2004, Limno-Tech, Inc.) and  Transect Viewer  
• Preliminary Flow and Solids Monitoring 2003-2004 Tittabawassee River, Michigan (November 2004, Limno-Tech, Inc.) [ Note:  Level Sensor Data Available from Lansing and Bay City Offices Upon Request] 
• Non-Analytical Sampling Activities for Tittabawassee River  (April 2005, CH2M Hill) **Note, this file is too large to place on this web page.  Contact Cheryl Howe from the WHMD at 517-373-9881 if you need a copy of this document.

Received by the DEQ from Dow on May 31, 2005 

• May 31, 2005 Submittal Letter 
• May 27, 2005 Draft Preliminary Conceptual Site Model  **Note, this file is too large to place on this web page.  Contact Cheryl Howe from the WHMD at 517-373-9881 if you need a copy of this document.
• Reports for Completed Studies 
• Sediment Evaluation Report, Upper Saginaw River, Saginaw, Michigan (May 2005, CH2M Hill) 
• Tittabawassee River Dioxin/Furan Concentration Vertical Variability (May 2005, CH2M Hill) 
• Transmittal of Analytical Data from Tittabawassee River Floodwater Samples (Memo dated 1/31/2005 CH2M Hill) 
• Dendrogeomorphic Pilot Study, Tittabawassee River Floodplain, Michigan (May 2005, Limno-Tech, Inc.) 
• Geochronology Pilot Study, Floodplain Soils, Tittabawassee River, Michigan (May 2005, Limno-Tech, Inc.)    

June 

July 

August 

September 

October 

Approved Dow Scopes of Work (SOWs) for the  Midland Area and the Tittabawassee River and Floodplain (10/18/2005) 

• DEQ Approval Letter 
• Midland SOW Cover Letter 
• Midland Area SOW 
• Tittabawassee SOW Cover Letter 
• Tittabawassee SOW    

November 

Final-Midland Representative Soils Sampling and Analysis Plan in Support of Bioavailability Study(11/1/2005) 

Preliminary Conceptual Model Update-Tittabawassee River and Floodplain (11/1/2005) **Note, this file is too large to place on this web page.  Contact Cheryl Howe from the WHMD at 517-373-9881 if you need a copy of this document.

DEQ/U.S. EPA Technical Review Comments on Dow/Entrix Screening Level and Baseline Ecological Risk Assessments (11/18/2005) 

December 

In addition to the information provided on this web site, copies of these work plans are available for public review at the following locations: 

• Grace A. Dow Memorial Library Reference Desk, 1710 West St. Andrews, Midland, Michigan (989-837-3449) 
• Zauel (Saginaw Township) Library, 3100 North Center Road, Saginaw, Michigan (989-799-2771) 
• DEQ, Waste and Hazardous Materials Division (WHMD), Saginaw Bay District Office, 503 North Euclid, Bay City, Michigan (contact Trisha Peters at 989-686-8025, ext. 8204) 
• DEQ, WHMD Office, North Atrium (Lower Level) Constitution Hall, 525 West Allegan, Lansing, Michigan (contact Cheryl Howe at 517-373-9881) 

Dow Tittabawassee River and Floodplain Remedial Investigation (RI) Work Plan (12/29/2005) **Note, this file is too large to place on this web page.  Contact Cheryl Howe from the WHMD at 517-373-9881 if you need a copy of this document.

• Appendix A- Historical Data Quality and Usability Assessment - Tittabawassee River and Floodplain Remedial Investigation Work Plan 
• Appendix B-Tittabawassee River Floodplain Scoping Study Field Investigation Report and Data Quality Evaluation 
• Appendix C - Dendrogeomorphology Study Update, Tittabawassee River Floodplain Summer 2005 and Geochronology Study Update, Floodplain Soils, Tittabawassee River, Michigan (**Note, this file is too large to place on this web page.  Contact Cheryl Howe from the WHMD at 517-373-9881 if you need a copy of this document.)
• Appendix D- Scoping Study Areas 1 and 2 Hydrodynamic Model Development 
• Appendix E- Distribution of Furans and Dioxins in Tittabawassee River Sediment 
• Appendix F- Furan And Dioxin Distribution in Floodplaing Soils 
• Appendix G- Data Quality Objectives for the Tittabawassee River and Floodplain Remedial Investigation 
• Appendix H- Sampling and Analysis Plan 
• Appendix I- Human Health Risk Assessment Work Plan 
• Appendix J- Screening-Level Ecological Risk Assessment and Baseline Ecological Risk Assessment Work Plans 
• Appendix K- Tittabawassee River Floodplain Representative Soils Sampling and Analysis Plan in Support of Bioavailability Study 
• Appendix L- Public Participation Plan 

Dow Midland Area Soils Remedial Investigation Work Plan (12/29/2005) **Note, this file is too large to place on this web page.  Contact Cheryl Howe from the WHMD at 517-373-9881 if you need a copy of this document.

Updated Quality Assurance Project Plan, Dow Midland Offsite Corrective Action Program (12/29/2005) 

Updated Field Standard Operating Procedures (12/29/2005)