January

February

GeoMorph Pilot Site Characterization Report - Upper Tittabawassee River and Floodplain Soils (2/1/2007)

• Submittal Letter from Dow
• Text
• Attachment A 
  • Study Area - Reaches A Through O, Upper Tittabawassee River
  • Reach Overview, Upper Tittabawassee River
  • 100-Year Floodplain, Upper Tittabawassee River
• Attachment B - Thalweg/Longitudinal Profile, Tittabawassee River
• Attachment C - 1937 and 2005 Channel Comparison - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment D - Sample Location Summary, GeoMorph Site Characterization, Upper Tittabawassee River
• Attachment E - Method Comparability Study Summary, USEPA 1613B and 1613-TRP/RT, GeoMorph Site Characterization, Upper Tittabawassee River
• Attachment F - USEPA Appendix IX Target Analyte List, GeoMorph Site Characterization, Upper Tittabawassee River
• Attachment G - 2006 Aerial Photography and High Resolution Topographic Mapping, Upper Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment H - Historic Outfalls, The Dow Chemical Company - Midland, Michigan - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment I- Geochemistry Protocol and Results, GeoMorph Site Characterization, Upper Tittabawassee River
• Attachment J - Report on Development of Hydrodynamic Model of the Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment K - Conceptual Model of Solids Movement in the Tittabawassee River and Floodplain
• Attachment L - Maximum TEQ by Location Maps, GeoMorph Site Characterization, Upper Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment M - Surface TEQ by Location Maps, GeoMorph Site Characterization, Upper Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment N - Cross-Sections, GeoMorph Site Characterization, Upper Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment O - Fixed-Interval and Random-on-Grid Statistical Comparison and Verification, GeoMorph Site Characterization, Upper Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment P - Technical Memorandum, Statistical Calibration and Verification, GeoMorph Site Characterization, Upper Tittabawassee River - Currently, the file size for this attachment is too large to place on this site.  However - The attachment is available on the Dow Regulatory Activities - Dioxin and Furan Situation - web page.
• Attachment Q- Preliminary In-Channel Sediment Inventory, GeoMorph Site Characterization, Upper Tittabawassee River
• Attachment R - GeoMorph Site Characterization Data Summary, Upper Tittabawassee River
• Attachment S- GeoMorph Site Characterization Data Summary - Erosion Scar Sampling, Upper Tittabawassee River
• Attachment T
  • USEPA Appendix IX Laboratory Report,  GeoMorph Site Characterization, Upper Tittabawassee River
  • Summary of Site Positives, USEPA Appendix IX,  GeoMorph Site Characterization, Upper Tittabawassee River
  • Tentatively Identified Compounds, USEPA 8260B, GeoMorph Site Characterization, Upper Tittabawassee River
  • Tentatively Identified Compounds, USEPA 8270C, GeoMorph Site Characterization, Upper Tittabawassee River

March

April

May

DEQ Letter to Dow - Approval to use GeoMorph process for Middle and Lower Tittabawassee River/Upper Saginaw River site characteriztion, including Interim Response Activities/Pilot Corrective Action Plan Decision Tree (5/3/2007)

Dow Response to GeoMorph Approval Letter (5/22/2007)

Dow E-mail Response Regarding Exposure Unit Sampling - Priority 1 and 2 Properties (5/25/2007)   

June

EPA Comments to the DEQ on Revised Dow Tittabawassee River and Floodplain and Midland Area Soils Remedial Investigation Work Plans (6/7/2007)

DEQ Letter to Dow - Response to May 22, 2007, letter from Dow in response to May 3, 2007, GeoMorph approval letter and May 25, 2007, e-mail from Dow on exposure unit sampling of Priority 1 and 2 properties (6/22/07)

DEQ Response to EPA Comments on Revised Dow Tittabawassee River and Floodplain and Midland Area Soils Remedial Investigation Work Plans (6/25/2007)   

July

EPA CERCLA Orders (7/12/2007)

• Reach D 
• Reach J-K
• Reach O 

DEQ Letter to Dow - Approval of the 2007 GeoMorph Sampling and Analysis Plan, Upper Tittabawassee River and Middle Tittabawassee River, and the 2007 Quality Assurance Project Plan, GeoMorph Investigation Tittabawassee River (7/12/2007)

Dow Remedial lnvestigation Scope of Work for the Saginaw River and Floodplain and Saginaw Bay, Michigan (7/13/2007)

DEQ Letter to Dow - Approval with modification of Compliance Schedules for the Tittabawassee River and Floodplain Soils and Midland Area Soils Remedial Investigation Work Plans (7/24/2007)   

August

DEQ Letter to Dow - Notice of Deficiency; Remedial lnvestigation Scope of Work for the
Saginaw River and Floodplain and Saginaw Bay, Michigan (8/29/2007)

September

Draft Current Conditions Report for the Saginaw River, Floodplain, and Bay (9/17/2007)

• Text
• Tables 
• Figure 1-1 
• Figure 2-1a 
• Figure 2-1b 
• Figure 2-1c 
• Figure 2-2 
• Figure 2-3a 
• Figure 2-3b 
• Figure 2-4 
• Figure 2-5 
• Figure 2-6
• Figure 2-7 
• Figure 2-8a 
• Figure 2-8b 
• Figure 2-8c 
• Figure 2-9a 
• Figure 2-9b 
• Figure 2-9c 
• Figure 2-10a 
• Figure 2-10b
• Figure 2-10c 
• Figure 2-11 
• Figure 2-12a 
• Figure 2-12b 
• Figure 2-12c 
• Figure 3-1a 
• Figure 3-1b 
• Figure 3-1c 
• Figure 3-2a 
• Figure 3-2b 
• Figure 3-2c 
• Figure 3-2d 
• Figure 3-3 
• Figure 4-1 
• Figure 4-2
• Figure 4-3 
• Figure 4-4 
• Appendix A 
• Appendix B 

October

Revised Remedial Investigation Scope of Work for the Saginaw River and Saginaw Bay, Michigan (10/15/2007)

Revised Dow Midland Area Soils Remedial Investigation Work Plan (10/15/2007)

• Cover Letter and Text
• Appendix A - Existing Data Quality and Usability Assessment - Midland Area Soils
• Appendix B - Interim Measures Report - Salzburg Road Area
• Appendix C - Soil Sample Results from Previous Studies
• Appendix D - Development of Target Analyte List
• Appendix E - Human Health Risk Assessment Work Plan Attachments
• Appendix F - Site History Attachments
• Appendix G - Data Evaluation Report in Support of Bioavailability Study, Midland Area Soils (Pre-RI Study Report)
• Dow Direct Contact Criteria Report for Midland Area Soils (10/15/2007) 
• Text (Pages 0-124)
• Text (Pages 125-211)
• Text (Pages 212-308)
• Appendix A - Calculation Spreadsheet
• Appendix E-3 - Pilot Study Report: Oral Bioavailability of Dioxins/Furans in Midland and Tittabawassee River Floodplain Soils
• Appendix E-3 (cont) - Follow-Up Study Report: Oral Bioavailability of Dioxins/Furans in Tittabawassee River Floodplain Soil
• Appendix E-3 (cont) - Summary of University of Michigan Dioxin Exposure Study - This appendix is too large to post; it is available for review at the DEQ Lansing and Bay City Offices or it can be provided upon request on CD.

Work Plan for Exposure Unit Sampling, Middle and Lower Tittabawassee River (10/15/2007) - This is a large file.  If it is too large for individuals without high speed Internet to download, it is available for review at the DEQ Lansing and Bay City Offices or it can be provided upon request on CD.

November

DEQ Letter to Dow - Disapproval and Letter of Warning:  Direct Contact Criteria Report for Midland Area Soils (11/9/2007)

December