USGS CMG P-2-79-SC Metadata

To collect 300 nautical miles of seismic reflection and side scan
sonar data at selected locations along the Southern California coast for
the U.S. Army Coastal Engineering Research Center for the purpose of
selecting tentative core locations and correlating seismic data with cores
when collected to delineate sand resources.

A total of 300 nautical miles of surveying were proposed for four
areas (offshore Oceanside, La Jolla, Mission Beach, and San Diego) and the
interconnecting lines. The survey area extended offshore from the seaward limit
of breaking waves to a water depth of about 250 ft. The actual shoreline
limit of survey lines varied between water depths of 20 to 30 ft depending
on weather and shoreline conditions. Where kelp beds prevented survey
operations, it was necessary to alter or eliminate some of the proposed survey
lines. The kelp bed areas were not considered as viable locations of offshore
sand resources because kelp beds require an exposed bedrock or cobble bottom
with only sparce sand overburden. The survey plan included simultaneous data
collection from the following systems along each line of the survey: navigation
system with track plotter, fathometer, side scan sonar, tuned transducer,
and high resolution subbottom profiler.

Woodward-Clyde Consultants contract