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The sentiment was backed by Ben Brubeck, director of government relations for Associated Builders and Contractors, a national trade association representing merit shop contractors, subcontractors, and material suppliers.

Mr. Brubeck said firms were reluctant to come out publicly until they see the actual language in the procurement documents.

“I am personally aware of at least three firms that are not interested in working on the project if there is … a mandatory Phase 2 mandate,” he said.

Nevertheless, mechanisms to fund the second leg are gradually moving forward.

In addition to the agency’s unanimous vote Wednesday on the funding plan, Loudoun County has also signed off on the agreement, under which it would pay for the design and construction of three parking garages in the county. And to the extent the law allows, it would allow the county to receive land from the agency for the Route 606 station.

Fairfax County would assume responsibility for building the Route 28 station and two parking facilities. But the process is by no means over.

Under the broader funding agreement, Virginia’s General Assembly must appropriate its additional $150 million. And the state has not yet signed off on the labor agreement or the broader memorandum among the stakeholders, which also include the Transportation Department and the Washington Metropolitan Area Transit Authority.

“We’ve got to fund the thing,” said MWAA Board Vice Chairman Thomas Davis III. “This is an important step. But we’ve got a long way to go.”