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Page Title: Table 8. Summary of Selected Capping Projects
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Table 8
Summary of Selected Capping Projects
Project
Contaminated Material
Capping Material
Volume
Site Name and  Volume
Location
Dredging
Placement
Cap Thickness
Placement
Positioning
Literature
Characteristics yd3 103
yd3 103
(Date)
Material
Method
ft
Method
Method
Source
Duwamish
Existing
1.1
Clamshell
Scow (sand)
3.6
1-3
Sprinkling from
Surveying
Truitt 1986b
Waterway
subaqueous
scow
instruments
Sumeri 1984
Seattle (1984)
depression
70 ft deep
Phase I Botlek
1,200
Trailing
Pump-out
-- (clay)
2-3
Scow, then
Surveying
d'Angremond,
Rotterdam
suction
submerged
leveled over
instruments
de Jong, and
Harbor excav
Harbor
Netherlands
to 98 ft deep
hopper
diffuser
site
de Waard 1986
(1981-1983)
d'Angremond,
Phase II 1st
620
Matchbox
Pipeline
-- (clay
2-3
Scow, then
Automated
de Jong, and
Petro. Harbor
suction
submerged
leveled over
dredge/suction
de Waard 1986
excav to 80 ft
diffuser
site
head
deep
positioning
equipment
Surveyed grid
Kikegawa 1983
N/A
N/A
N/A
-- (sand with
1.6
Conveyor to
Hiroshima Bay,
Contaminated
and winch/
Togashi 1983
shell)
gravity-fed
Japan
bottom
anchor wires
submerged
(1979-1980)
sediment
tremie suction
overlaid in situ
pump-out thru
with capping
submerged
material 70 ft
spreader bar
deep
New York Bight
Generally flat
860 (mounded
Clamshell
Scows
1,800 (majority
avg: 3-4
Scow, hopper
Buoy, real-time
Freeland 1983,
(1980)
bottom 80-90 ft
to 6 ft thick)
fine sand)
max: 5-9
dredge
navigation
Mansky 1984,
deep
electronics
O'Connor and
O'Connor 1983,
Suszkowski 1983
Morton, Parker,
34 (mounded
Clamshell
Scows
65.4 (sand)
7-10
Hopper
Buoy,
Central Long
Stamford-New
and Richmond
to 3-6 ft thick)
dredge
LORAN-C
Haven North,
Island Sound
1984; O'Connor
flat bottom 65 ft
coupled
Disposal Area
and O'Connor
deep
positioning
(CLIS) (1979)
1983
system
Morton, Parker,
50 (mounded
Clamshell
Scows
100 (cohesive)
13
Scow
Buoy,
CLIS (1979)
Stamford-New
and Richmond
to 4-6 ft thick
LORAN-C
Haven South,
1984; O'Connor
coupled
flat bottom
and O'Connor
positioning
70 ft deep
1983
system
(Continued)

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