FINAL REPORT DIOXIN-LIKE TOXICITY IN THE SAGINAW BAY WATERSHED GREAT LAKES NATIONAL PROGRAM OFFICE GRANT PROJECT # GL965334010 AND PBDE DISTRIBUTION IN THE SAGINAW BAY WATERSHED GREAT LAKES NATIONAL PROGRAM OFFICE GRANT PROJECT # GL96558601-0 Prepared by Michigan Department of Environmental Quality Allan B. Taylor, Deborah R. MacKenzie-Taylor, Arthur Ostaszewski, John M. McCabe May 2, 2006 Revised August 31, 2006 Dioxin-Like Toxicity in the Saginaw Bay Watershed GLNPO Grant Project # GL965334010 PDDE Distribution in the Saginaw Bay Watershed GLNPO Grant Project # GL96558601-0 Table of Content List of Tables................................................................................................................................ iii List of Figures .............................................................................................................................. iv Abstract 1 Introduction 2 General......................................................................................................................................2 Study Area.................................................................................................................................3 Background ...............................................................................................................................4 Previously Collected Information: Dioxins, Furans, and Coplanar PCBs .............................4 Previously Collected Information: PBDEs.............................................................................4 Study Objectives .......................................................................................................................5 Materials and Methods..................................................................................................................5 Sample Collection .....................................................................................................................5 Floodplain Soils .....................................................................................................................6 Sediment Grab Samples........................................................................................................6 Sediment Core Samples........................................................................................................7 Sample Analysis........................................................................................................................8 Table 1. Laboratory Analysis and Preparation Methods.......................................................8 Results 9 Table 2. Sample Allocation by Location, Type, and Lab.......................................................9 Distribution of TEQ (Dioxins, Furans, and Coplanar PCBs) Concentrations...........................10 Floodplain TEQ Results ..........................................................................................................11 Table 3. Shiawassee River Floodplain Total TEQ in ppt ....................................................11 Table 4. Saginaw River Floodplain Total TEQ in ppt..........................................................12 Table 5. Saginaw Bay Floodplain Total TEQ in ppt ............................................................14 SEDIMENT TEQ RESULTS....................................................................................................15 Table 6. Shiawassee River Sediments Total TEQ in ppt....................................................15 Table 7. Saginaw River Sediments Total TEQ in ppt .........................................................16 Table 8. Saginaw Bay Sediments Total TEQ in ppt............................................................17 Distribution of PBDE Concentrations ......................................................................................17 Floodplain Soils PBDE Summary Results...............................................................................18 Table 9. Shiawassee River Floodplain PBDE Summary Results in ppb ............................18 Table 10. Saginaw River Floodplain PBDE Summary Results in ppb ................................19 Table 11. Saginaw Bay Floodplain PBDE Summary Results in ppb ..................................20 Sediment PBDE Summary Results .........................................................................................21 Table 12. Shiawassee River Sediment PBDE Summary Results in ppb............................21 Table 13. Saginaw River Sediment PBDE Summary Results in ppb .................................22 Table 14. Saginaw Bay Sediment PBDE Summary Results in ppb....................................24 Quality Assurance and Quality Control – Dioxins, Furans, and Coplanar PCBs ........................24 Table 15. Quality Control Limits..........................................................................................24 Accuracy..................................................................................................................................25 2004 Survey Lab Accuracy .....................................................................................................25 Total TEQ Field Replicates .....................................................................................................25 Table 16. Total TEQ FR Results.........................................................................................26 Representativeness.................................................................................................................26 2004 Survey Representativeness ...........................................................................................26 Comparability ..........................................................................................................................26 2004 Survey Comparability .....................................................................................................26 Table 17. NY Lab vs. Eno River Lab Total TEQ Results in ppt ..........................................27 Completeness .........................................................................................................................27 2004 Survey Completeness ....................................................................................................28 i Dioxin-Like Toxicity in the Saginaw Bay Watershed GLNPO Grant Project # GL965334010 PDDE Distribution in the Saginaw Bay Watershed GLNPO Grant Project # GL96558601-0 Quality Assurance and Quality Control - PBDEs.....................................................................28 Table 18. Quality Control Limits..........................................................................................28 Accuracy..................................................................................................................................28 2004 Survey Lab Accuracy .....................................................................................................28 Total PBDE FR........................................................................................................................28 Table 19. Total PBDE FR Results ......................................................................................29 Representativeness.................................................................................................................29 2004 Survey Representativeness ...........................................................................................29 Comparability ..........................................................................................................................29 2004 Survey Comparability .....................................................................................................29 Completeness .........................................................................................................................29 2004 Survey Completeness ....................................................................................................30 Discussion 30 Dioxins, Furans, and Coplanar PCBs......................................................................................30 Shiawassee River ................................................................................................................30 Saginaw River......................................................................................................................30 Saginaw Bay........................................................................................................................31 PBDEs.....................................................................................................................................32 Shiawassee River ................................................................................................................32 Saginaw River......................................................................................................................32 Saginaw Bay........................................................................................................................33 Table 20. Total TEQ Floodplain Soil Results......................................................................33 Table 21. Total TEQ Sediment Results ..............................................................................34 Conclusions and Recommendations ..........................................................................................34 Dioxins, Furans, and Coplanar PCBs Conclusions .................................................................34