This video shows the Santa Cruz Harbor dredging project.
The material dredged from the bottom of the Santa Cruz Small Craft harbor is a combination of sand, natural organic plant life and seawater. Dredged material (averaging 200,000 cubic yards per year) is an important sand resource for beach replenishment downcoast of the harbor (see “Littoral Drift”).
Occasionally, low level odors emanate from the dredged material in the immediate proximity of the discharge point. These odors are created by the natural decay of aquatic plant life and are principally due to the minute presence of hydrogen sulfide gas, a natural byproduct of the decay process.
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Dredging Today Staff, March 20, 2013