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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