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Page Title:
Table 3. Compatibility of Capping and Contaminated Material Placement Options |
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 Table 3
Compatibility of Capping and Contaminated Material Placement Options
Barge Point
Hopper Point
Hopper
Disposal
Disposal
Pipeline
or Barge
Spread
Pipeline5
CAD slurry6
I7
C8
I
I
I
I
I
I
I
C
Slurry clay
C
C
I
C
C
C
C
C
C
C
balls
Sandy
C
C
C
C
C
C
C
C
C
C
Hopper9
CAD slurry
I
I
I
I
I
I
I
C
I
C
Slurry clay
C
C
I
C
C
C
C
C
C
C
balls
Sandy
C
C
C
C
C
C
C
C
C
C
Barge10
Maint.
C
I
I
C
I
I
C
C
I
C
silt/clay
Clumps
C
C
C
C
C
C
C
C
C
C
Sandy
C
C
C
C
C
C
C
C
C
C
Note: The compatibility designation of incompatible (Footnote 7) and compatible (Footnote 8) is a general recommenda-
tion. Site-specific or material-specific considerations could over-ride these general designations.
1
Sand - Predominantly cohesionless material (sand).
2
Clumps - Predominantly fine-grained material mechanically dredged with in situ water content sufficiently low to cause
clumping to occur and be maintained.
3
Clay balls - Small balls of clay formed during hydraulic dredging of fine-grained material.
4
Slurry - Predominantly fine-grained material hydraulically dredged (pipeline or hopper) with water content sufficiently
high to allow slurry.
5
Pipeline - Material is used by hydraulic pipeline dredge (slurried) with direct pipeline transport for placement. May
include use of submerged diffusers. Would include hopper dredge or barge pump-out (reslurried). For capping
operations, appropriate means to spread the material is recommended. Clay balls are assumed to act as slurry.
6
Contaminated material in slurry form placed without lateral confinement (CAD) is not recommended for a capping
project.
7
Generally incompatible.
8
Generally compatible.
9
Hopper - Material is dredged by trailing suction hopper (slurried) and transported directly to site for surface release.
This would also include hydraulically filled barges.
10 Barge - Material is mechanically dredged, placed in barges, and transported to site for surface release (no slurry).
Could either point dump or incorporate provision to sprinkle or spread material by controlled release from the barge.
40
Chapter 5 Equipment and Placement Techniques
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