Cook Plant preoperational studies 1970 / John C. Ayers ... [et al.].

some turbulence on the bottom. Small patches of black organic material were
found on top of the silt in this area.
Several pockets of silt were found in the 17 to 10 m depth zone along
this transect. Although these pockets of silt varied somewhat in size, they
all averaged about 25 to 30 cm in depth. Silt depth was estimated by pulling
a vertically held forearm through the pockets while the extended fingers remained in contact with firm bottom.
At a depth of 12 m the bottom type became a silty sand exhibiting large
bifurcating ripple marks. The wave length of the ripple marks was about 30 cm
and their heights varied from 10 to 16 cm.
During the last 91 m of this transect visibility was reduced to near zero
because of dredging operations at the plant site. The dive was terminated at
a depth of 6 m.
No macrophytes were observed on transect number one. The bottom topography indicated a degree of turbulence which would not offer a stable environment for macrophytes.
Date 13 October 1970 Dive No. 2
Location Transect No. 2 - one-quarter mile north of Transect No. 1
Depth 6 to 15 meters
Team Bob Anderson, Tom Bottrell Dive time 23 minutes
Work Brief/Notes. Boarded the Zodiac at the completion of transect
number one and moved approximately one-quarter of a mile north of transect
one. Started transect number two at a depth of 6 m and proceeded offshore.
The observations made during this dive were almost identical to those
made on dive number one. The bottom type out to a depth of 12 m consisted
of a silty sand. Large bifurcating ripple marks were again found in the
area of silty sand. The bottom type in the area between 12 and 15 meters

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