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Dispute should be resolved soon: Long Beach port CEO

Import of port dispute

U.S. Labor Secretary Thomas Perez's involvement in the West Coast port labor negotiations is a "welcome addition" that should help resolve the ongoing dispute, the CEO of the Port of Long Beach told CNBC on Tuesday.

"We're so close I can't imagine they can't resolve this very, very soon," Jon Slangerup said in an interview with "Closing Bell."

Slangerup noted he is not involved in the negotiations, but said "we have worked as hard as we can to make sure that both sides know and feel what the ultimate customers are feeling in this entire process and it is a severe amount of pain right now."

Secretary of Labor Thomas Perez
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West Coast ports reopened Tuesday after shutting down for the long weekend because of an ongoing contract dispute between dockworkers and shipping and port terminal operators. The disagreements at the bargaining table have led to gridlock at the ports, disrupting supply distributions from household goods and clothing to food.

Perez flew to San Francisco on Monday to help bring the monthslong negotiations to a resolution.

Read MoreUS official overseeing West Coast port talks

At the Port of Long Beach, the second-largest port in the United States, there are about 32 ships at anchor, 22 of which are container vessels, waiting to come into port, Slangerup said.

"That is an enormous and almost record level of backlog sitting out at anchor," he said.

On top of that, its six container terminals are above 95 percent physical capacity.

"The challenge of digging out from under this is immense. It's epic. We've not ever experienced this before and of course this is tied to these very, very large vessels that are now calling upon the ports."

Read MorePort fight costing us $400,000 a day: CEO

That said, once a labor agreement is signed, Slangerup said he expects congestion to start easing up within several weeks.

"We think that we're going to make tremendous headway within about six to eight weeks," he said. "We'll certainly be back to normal by our next peak, which is really the September time frame."

Port upgrade needed

Meanwhile, the Port of Long Branch is about halfway through a $4.5 billion infrastructure program to upgrade the port so it can handle the larger vessels now coming its way, Slangerup said.

"They dwarf anything that we've seen in the past and these are small compared to being what's being built right now," he said.

—The Associated Press contributed to this report.