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Spot rate for 40-foot container moving from Shanghai to the U.S. East Coast estimated to be more than $5,000.
Terminal operator says it will seek other carriers for container terminal.
Southern California ports plan continued cooperation to get containers moving.
Transpacific carriers cite port congestion and stronger demand as economy improves.
New style port directors are trying to tailor ports to industry supply chain needs.
Senate moves to decouple fight over immigration policy from Homeland Security, but resistance remains in House.