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Western Dredging Association Midwest Chapter – 2010 Annual Meeting

Western Dredging Association Midwest Chapter – 2010 Annual Meeting. St. Louis River / Interlake / Duluth Tar (SLRIDT) Superfund Site – Duluth, Minnesota 2010 Tallas Island Compensatory Mitigation Project – Winter Dredging. Overview. SLRIDT Site Background

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Western Dredging Association Midwest Chapter – 2010 Annual Meeting

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  1. Western Dredging AssociationMidwest Chapter – 2010 Annual Meeting St. Louis River / Interlake / Duluth Tar (SLRIDT) Superfund Site – Duluth, Minnesota 2010 Tallas Island Compensatory Mitigation Project – Winter Dredging

  2. Overview • SLRIDT Site Background • SLRIDT Site Remediation Activities (2006-2009) • 2010 Tallas Island Winter Dredging • Options • Pros/Cons • Winter Dredging Activities • Challenges Experienced • Project Benefits

  3. SLRIDT Site Background

  4. SLRIDT Site Background 54th Ave. Peninsula Slip 6 59thAve. Peninsula Stryker Bay Dock 6 Slip 7 Dock 7

  5. SLRIDT Site Remediation 2006 54th Ave. Peninsula Stryker Bay Cap/ Surcharge CAD Dock 6 Slip 7 Dock 7 Sheet Pile Wall CADEnd Dike Turbidity Curtain

  6. SLRIDT Site Remediation 2007 Water Filtration Plant Discharge Pipe Compost Area 54th Ave. Peninsula Cap/ Surcharge Dock 6 Stryker Bay Wetland Excavation Areas CAD Dock 7 Tremie Barge Return Water Line Aggregate Material Placement Dredge Barge Slip 7 Aqua Dam & Weir CADEnd Dike Turbidity Curtain Sediment Slurry Pipeline

  7. SLRIDT Site Remediation 2008 Water Filtration Plant Discharge Pipe Compost Area Aggregate Material Placement Wetland Excavation Areas Cap/ Surcharge Return Water Line Stryker Bay CAD Dock 6 Dock 7 Slip 7 Tremie Barge 54th Ave. Peninsula Aggregate Material Placement Sediment Slurry Pipeline Dredge Barge Turbidity Curtain

  8. SLRIDT Site Remediation 2009 Water Filtration Plant Discharge Pipe Compost Area 54th Ave. Peninsula Aggregate Material Placement Cap/ Surcharge CAD Return Water Line Stryker Bay Dock 6 Dock 7 Slip 7 Aggregate Material Placement Tremie Barge Wetland Excavation Areas Aggregate Material Placement Sediment Slurry Pipeline Dredge Barge Turbidity Curtain

  9. 2010 Tallas Island Compensatory Mitigation Project

  10. 2010 Tallas Island Compensatory Mitigation Project

  11. 2010 Tallas Island Compensatory Mitigation Project

  12. Tallas Island Winter Dredging • Options….. • Dredge and Transport via Barge • Dredge and Transport via Over-the-Road Trucks • Dredge and Hydraulic Transport

  13. Tallas Island Winter Dredging • Pros • Expedite 2010 Construction Schedule • Minimizes Environmental Impacts • Minimizes Community Nuisances • Allows Shallow Draft Dredge Equipment Access • Cost savings

  14. Tallas Island Winter Dredging • Cons • Potential Hazards of On-Ice Dredge Work • Schedule Constraints • Temperature Dependent • Vegetation Segregation

  15. Tallas Island Winter Dredging Environmental Media Stockpile Location Turbidity Curtain Vegetation Removal Limits

  16. Tallas Island Winter Dredging

  17. Tallas Island Winter Dredging

  18. Tallas Island Winter Dredging

  19. Tallas Island Winter Dredging

  20. Tallas Island Winter Dredging

  21. Tallas Island Winter Dredging

  22. Tallas Island Winter Dredging

  23. Tallas Island Winter Dredging

  24. Tallas Island Winter Dredging

  25. Tallas Island Winter Dredging

  26. Tallas Island Winter Dredging

  27. Tallas Island Winter Dredging

  28. Tallas Island Winter Dredging Challenges Experienced

  29. Tallas Island Winter Dredging Unseasonably Mild Temperatures

  30. Tallas Island Winter Dredging On-Ice Construction Safety Hazards

  31. Tallas Island Winter Dredging Frost Road Construction

  32. Tallas Island Winter Dredging Segregation of Vegetative Root Mass from Ice

  33. Tallas Island Winter Dredging Thin Ice Experiences

  34. Tallas Island Winter Dredging Extreme Working Conditions

  35. Tallas Island Winter Dredging Sub Zero Porta Johns!

  36. Tallas Island Winter Dredging • Project Benefits • Flexible 2010 Construction Schedule • Minimized Environmental/Community Impacts • Expedited Other SLRIDT Work Activities • Monetary Impact • Restoration of the Surrounding Environment

  37. Special Thanks To:

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