• The International Longshoremen and Warehouse Union caucus began reviewing a tentative deal with port ownership Tuesday.
• The full union member voting process is expected to begin Thursday and Friday, with no set date for a release of the results.
• Billions of dollars in trade has been slowed as a result of the strike.

The fate of operations at West Coast ports in Canada hinges on the results of a vote among rank-and-file members of the International Longshoremen and Warehouse Union Canada.

The full union began reviewing the tentative deal with port ownership Tuesday after a week of confusion and turmoil at the ports, and the voting process among rank-and-file members of the ILWU Canada is expected to begin Thursday and Friday.

The union has told CNBC there is no set timetable to announce vote results.

Last week, the Canadian government had said the strike was over and the deal its mediators had put together was accepted by both parties, but the union caucus later voted down the tentative deal. That set off a series of on-again, off-again work stoppages, creating confusion and frustration among shippers.

Ultimately, the ILWU caucus approved and recommended to its membership the terms of settlement proposed by the senior federal mediator and ratified by the British Columbia Maritime Employers Association, or BCMEA, which represents port ownership, on July 13.

In a tweet, Canadian Labor Minister Seamus O'Regan thanked the caucus for sending the tentative deal to the membership.

According to the BCMEA, the settlement package includes a compounded 19.2% wage increase over four years, which would result in the median ILWU income moving from $136,000 to $162,000, not including benefits and pension. The proposed deal also provides an 18.5% increase in retirement lump sum payments, increased tool allowances, benefits, and pension contributions.

Damage to supply chain

Logistics managers and trade experts tell CNBC the delays created by the strike, which began July 1 and lasted 13 days before ending July 20, and the half-day strike this week, created costly diversions and delays.

Weekly rail trade data aggregated by the American Association of Railroads reveals a continued decrease of 82.4% in rail trade.

The Railway Association of Canada has estimated that it would take three to five days for every day the strike lasted for networks and supply chains to recover. When the first strike ended on its 13th day, delays for rail containers were estimated at 39 to 66 days. That does not include the delays in vessels waiting to get processed.

The ports of Vancouver and Prince Rupert are critical for U.S. trade, with 15% of U.S. trade coming into the Port of Vancouver, and 60% of all the containers bound for rail destined for the U.S.

Trade delays lead to late fees on cargo containers that shippers pass onto the consumer. The delays also are taking place during peak shipping season, including back-to-school and holiday orders bound for the U.S.

The National Association of Chemical Distributors told CNBC some chemical companies are expecting supply chain congestion until October as a result of the strike. Critical chemicals that go into food, cleaning, water purification, and personal care, among many others, flow through the West Coast ports of Canada and down to the United States. The association's CEO, Eric Byer, said chemical distributors were already seeing significant delays in the movement of products and that the second strike will add to what is already "millions of dollars of chemicals" stranded on the water.

"It is imperative that both the BCMEA and ILWU come to an immediate agreement to ensure the stability of a global supply chain that continues to encounter significant operating challenges," Byer said.

In a statement, Canadian National Railroad said it is concerned about the impact of this renewed work stoppage on the North American economy and on Canada's reputation as a trading partner. "We will be communicating with our customers to discuss next steps. Our supply chains need reliability, stability, and predictability to function properly. We urge the Government and both parties to do whatever is necessary to get goods moving again," it said.

Trade on the water waiting to enter the ports of Vancouver and Prince Rupert has decreased to around $3 billion as vessels have either left to go to U.S. ports first or have left altogether. At the height of the strike, the amount of trade was around $12 billion.

Destine Ozuygur, head of operations at eeSea, said that given this latest supply chain surprise, carriers and terminals are weighing decisions and waiting on more information before taking action.

Correction: This article has been updated to reflect that ILWU Canada union members began reviewing a tentative deal with port management Tuesday. The voting process is expected to begin Thursday and Friday, with no set timetable for results to be released. An earlier version of this article misstated the timeline for the union process.