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hopper dredge required portions of Reach 1 for access to the shoaled area. At
1651 hr dredging was ceased, and the Beachbuilder moved further to the RDB
side of the channel. All anchors were retrieved and plans were made to move the
Beachbuilder to Reach 2. Weeks Marine personnel started work on breaking the
submerged line and moving the hard point to Reach 2. Operations were termi-
nated at dusk due to potential safety issues. Total downtime for 6 June was 17 hr
35 min.
7 June 2002
Work on adding additional submerged line and moving the hard point
resumed at daylight on 7 June. Sections of steel pipe were added and submerged
on the RDB side of the channel extending the discharge line to the selected
location for the hard point in Reach 2. Operations were terminated at dusk on
7 June (resulting in a total downtime of 24 hr) and resumed at daylight on 8 June.
8 June 2002
Weeks Marine personnel completed setting the hard point at mid-morning on
8 June. The floating hose was connected to the hard point and two upstream
anchors were set, one on each side of the channel. Water was pumped through
the discharge line to test equipment and pipeline integrity.
Dredging was initiated in Reach 2 at 1230 hr on 8 June. The Beachbuilder
was configured with the Delta Pacer as the push boat and the Delta Eagle on the
starboard side. The dredge made adjacent 750-ft-long cuts in Reach 2 south of
the hard point working across the channel from the RDB side of the channel to
the LDB side. Dredging continued on a 24-hr basis. The total downtime for
8 June was 14 hr 5 min. In addition to the time required to reset the hard point,
the main engine shut down eight times for a total downtime of 50 min and
dredging was stopped to add a length of shore line (35 min).
Vessel traffic passage was accomplished by dropping the starboard bow
cable, the one across the channel, as the vessel traffic approached, and picking
the cable back up after the vessel traffic cleared. By free-spooling the winch, the
cable dropped to the bottom of the channel and went slack within 5 sec. With the
additional power from the Delta Pacer, the Beachbuilder was able to continue
dredging with the starboard bow cable slack for vessel traffic passage. After
consultation with various river pilots, it was decided that the Beachbuilder could
safely dredge during the passage of vessel traffic without moving if the
Beachbuilder was dredging in the RDB half of the channel and the vessel traffic
could pass in the LDB half of the channel. The Beachbuilder would cease opera-
tions and move back to the RDB side if it was dredging in the LDB half of the
channel, if two vessels were passing each other in the channel, or if the river pilot
in command of the vessel requested additional clearance. This policy was suc-
cessfully practiced during the remainder of the demonstration project.
In addition to the vessel traffic moving up and down the river, up to four
hopper dredges were working in the HOP area during the dustpan demonstration
15
Chapter 2
Project Description

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