Port of Long Beach officials Tuesday approved a $1.2 billion budget to turn an old pair of shipping terminals into one mega terminal that is expected to handle more than 2 million additional containers.

Tuesday’s action by the Board of Harbor Commissioners formalizes the budget for the 342-acre project, though construction already began in 2011. About $513.4 million in work on the Middle Harbor project has been completed or is under way, according to port officials.

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