WASHINGTON — Virginia Gov. Tim Kaine has until Friday to respond to concerns raised by the Federal Transit Administration that the first phase of a proposed $5.1 billion, 23-mile subway extension to Washington Dulles International Airport does not currently meet cost/benefit requirements for federal funding.

“I am writing to notify you that the Federal Transit Administration has agreed to your request for additional time to consider FTA’s concerns about the Dulles Corridor Metrorail-Extension to Wiehle Avenue Project,” FTA administrator James Simpson said in a Jan. 28 letter to Kaine that gives him until Feb. 1 to respond.

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