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Dredging: Methods, Options, and Issues

Dredging: Methods, Options, and Issues. Presentation to Adirondack Sustainable Communities. By Dave Wick, District Manager Warren County Soil and Water Conservation District. Project Goals. Why dredging? Environmental or Economic benefit? Scale of Project Finances available.

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Dredging: Methods, Options, and Issues

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  1. Dredging: Methods, Options, and Issues Presentation to Adirondack Sustainable Communities By Dave Wick, District Manager Warren County Soil and Water Conservation District

  2. Project Goals • Why dredging? • Environmental or Economic benefit? • Scale of Project • Finances available

  3. Define the Project • What is the material to be dredged? • Dredging technique (mechanical vs. hydraulic) • Who will “own” the project, who will “run” the project • Permitability • Liability

  4. Techniques Mechanical Dredging • Excavators, Trucks, Loaders, Dozers, etc. • 50-70% solids • No large dewatering area required

  5. Techniques Hydraulic Dredging • Augur in front, like a snowblower • 10-20% solids • 80-90% water • Need large dewatering area

  6. Dewatering

  7. Dewatering

  8. Project Containment

  9. Project Containment

  10. Permits • NYS DEC / US Army Corps of Engineers Joint Application for permit • State Environmental Quality Review Act (SEQRA) • Wetlands disturbance permit (APA)

  11. Sediment Sampling • Over 1,500 cubic yards, cost per sample approximately $800 each • Scale of project determines sampling density • NYS DEC determination • Under 1,500 cubic yards, costs greatly reduced

  12. Project Ownership • Who will sign the permit, i.e. own the project? • Project management • Liability coverage • Insurance requirements

  13. Costs • Highly variable, based upon methods, access, equipment availability, etc. • Glen Lake shoreline dredging project was approximately $100,000

  14. Timeframes • Project planning and permitting, approximately one year if all goes well • Actual dredge time dependent upon scale of project

  15. Case Study: Glen Lake

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