Archive for April, 2015

S/V Taku

New Additions to the Survey Vessel Fleet

eTrac has purchased its 8th and 9th survey vessels. The first, an aluminum 21′ Thunderjet. The vessel’s first project is to support a dive operation with a local dive firm in support of a debris removal operation. Divers were positioned with GPS and motion sensor, coupled to a USBL and

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Backscatter imagery of disposal site and survey area.

Multibeam Survey of Humboldt Ocean Disposal Site

eTrac completed a multibeam survey of the Humboldt Ocean Disposal site approximately 10 miles offshore. Mulitbeam and snippets data were collected on an R2 2024 down to 400ft to create both bathymetry and backscatter grids. A sediment classification map was created using this data with sediment samples collected across the

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Sub-bottom Profiler Used for Pipeline Location

eTrac was contracted to locate a pipeline submerged approximately 15ft below the seafloor in the San Francisco Bay. A Teledyne Benthos Chirp III sub-bottom profiler was mobilized on SV Pulse for high resolution sub-surface imagery. An R2 Sonic 2024 running at 400khz was used to image subsea diffusers as well

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BEAMS in the Bay

eTrac hosted 8 students from the College of Charleston’s BEAMS (BEnthic Acoustic Mapping and Survey) Program to conduct a survey of Raccoon Strait in the San Francisco Bay. The students were able to learn and assist in the survey set up and acquisition, gaining valuable hands-on experience. Students in the

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