2.3.1.1. Mechanical vs. Hydraulic Dredging

Try these first

1. 1.

   What is monitored natural recovery?

   Hint

   Think about how nature can clean itself.

2. 2.

   List one advantage of hydraulic dredging.

   Hint

   Consider how the mechanics differ between the two methods.

3. 3.

   What is the primary benefit of hydraulic dredging over mechanical dredging?

   • Higher contaminant retention
   • Lower resuspension
   • Faster operation

   Hint

   Think about how each method disturbs the sediment.

4. 4.

   True or False: In-situ capping can negatively impact aquatic life.

   • True
   • False

   Hint

   Consider what happens to organisms buried under clean material.

5. 5.

   Analyze the choice between mechanical and hydraulic dredging for a highly contaminated site. What considerations would affect the decision?

   Hint

   Consider both the ecological and operational consequences.

6. 6.

   Suppose a monitoring program indicates that natural recovery is occurring slower than predicted. What alternative strategies should be proposed?

   Hint

   Think about modifying the approach to meet environmental goals.