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PMA neither loaded nor unloaded ships over the weekend, leaving yard and gate operations up to individual terminals.
Opponents say the fee drives port costs higher and those costs are difficult to pass on to shippers.
Move comes as ILWU, PMA talks enter 10th month.
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.