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PMA neither loaded nor unloaded ships over the weekend, leaving yard and gate operations up to individual terminals.
Draymen say they could be forced out of business by huge demurrage and detention bills.
PMA says it offered the ILWU a 5-year contract with 3% annual wage increases, and negotiations will continue, but a lockout could occur in 5-10 days.
Experimental off dock drop yard at the Port of Los Angeles could help speed containers.
The International Association of Classifications Societies said it would continue to study the report and the will finalized the requirements soon.
The federal agency alleges shipments did not include relevant documents and were improperly packaged and labeled.