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Cruise News: R/V David Johnson

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Hank testing camera system
At Pier 39 in San Francisco, Hank Chezar tests the underwater camera system.
In mid-January 1999, the R/V David Johnson returned to central San Francisco Bay for follow-up studies of three bedrock knobs that rise above the unconsolidated sediment to water depths of <39' (LLW). The rocks are within the general westbound traffic zone and about 200 m from the Deep Water Traffic Lane, where oil tankers and cargo vessels with drafts of 50' routinely enter the bay; thus, a potential catastrophe awaits. The rocks have been lowered by blasting in the past (late 1800s and early 1900s) and the Harbor Safety committee is meeting frequently to determine how to tackle this problem under present rules and regulations.

At their invitation, John Chin and Paul Carlson have attended several of the meetings. We (Mike Boyle, Paul Carlson, John Chin, and boat skipper Gordon Smith) ran very successful high-resolution seismic lines and a few sidescan sonar lines across the rocks and over some of the sand shoal areas. Hank Chezar joined us for one day and we obtained some good video over two of the rocks and over one of the sand shoals. Fortunately, we had our camera deployment before the rains came to muddy up the water.

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