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PMA said ships will not load or unload cargo Thursday, Saturday, Sunday or Monday due to continuing ILWU slowdowns.
Employers "hopeful that this will allow us to move toward conclusion of an agreement in the near term."
The Taft-Hartley Act gives presidents ability to intervene in damaging work stoppages such as the one engulfing West Coast ports.
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.