The extension was given so that the public has more time to read, comprehend and comment on the nearly 6,000-page proposal, a statement from the port said.
The US' largest port seeks to expand and modernise the TraPac container terminal at berths 136-147 in Wilmington, California, and upgrade existing wharf facilities, add an on-dock rail yard, and install a buffer area between the terminal and the community.
The proposed project includes a 30-year lease and would involve two phases of construction from 2008-2015 and 2015-2025.