Thirteen ships are at anchor in San Pedro Harbor including eight containerships.
Liner carriers in the transpacific say they will begin to impose a $1,000-per-FEU surcharge on Monday.
The Obama administration is monitoring the contract negotiations, while shippers groups are asking for presidential intervention.
A congressional watchdog agency said the Agency for International Development could do more to assist AGOA countries develop export strategies.
Arkansas-based intermodal carrier sees growth in all divisions, aided by lower fuel prices, but offset by increased costs in hiring and retaining drivers.
Railroad sees increased volumes in nearly all commodity groups.