A project to restore wildlife habitat, sponsored by the Port of Stockton and implemented by the U.S. Army Corps of Engineers, began during 2013. This work involves dredging sandy spoil from the San Joaquin River and pumping it to the Antioch Dunes. The purpose is to spur population growth of the Lange's metalmark butterfly The process employs a hydrulic cutter-suction dredger, which pumps the sand-water mixture through a fish screen. The mixture flows through a series of berms, which separate the sand from the water, which is pumped back to the river. The sand is then distributed onshore. When the sand is in place, the project will replant it with buckwheat and two endangered plants.[3]
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