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Client: Chevron Pipeline
Company Completion
Date: 2000 Contract Value:
$120K
Chevron Pipeline Company transports
aircraft fuel to Sacramento Airport through an 8”-diameter pipeline buried
beneath the 7-mile wide Sacramento Delta.
At 5-year intervals (1987, 1992, and 1997), Chevron Pipeline contracted
Sea Surveyor to map the pipeline’s location and depth-of-burial as it crossed
the Delta, the Deep Water Ship Channel, and several sloughs. A subbottom profiler used seismic reflection
techniques to locate the buried pipeline and determine its burial depth. Divers used “jet probes” to directly measure
the pipe’s depth-of-burial at selected locations to calibrate the seismic
reflection data. A Class 1 hydrographic
survey mapped the elevation of the seafloor over the pipeline.
The pipeline was
exposed by scour during the 1998 El Nino flood and damaged when struck by a
ship’s anchor. Sea Surveyor provided
emergency survey services to Chevron Pipeline Company, and located the exposed
pipeline and ship’s anchor. Sections of
the pipeline had been damaged by the ship’s anchor, dragged out of its trench,
and were unsupported above the seafloor.
Sea Surveyor provided navigation services to divers and contractors that
recovered the anchor, repaired the pipeline, and covered the exposed pipeline
with protective rock armor.
In 1999-2000, Sea Surveyor provided precision
navigation
services to assist a contractor that used
directional
drilling techniques to install a new pipeline
across the
960-C Grant
Street, Benicia CA 94510 (707)
746-1853 info@seasurveyor.com Pipe in Subbottom Record. Chart and Profile of Pipe crossing under Ship Channel.
Deep Water Ship Channel.
