[2] 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 hydraulic cutter-suction dredger, which pumps the sand-water mixture through a fish screen.

[2] See the Lange's metalmark article for some background on the decline of the Antioch Dunes habitat prior to the formation of the Refuge.

[3] This article incorporates public domain material from websites or documents of the United States Fish and Wildlife Service.