There's an apparent winner in the race to build the second half of Metro's Silver Line.

A team led by Clark Construction Group and Kiewit Infrastruction Co. South was the low bidder Friday for a contract to build the Silver Line's second phase, from Reston into Loudoun County via Dulles International Airport. The team, named Capital Rail Constructors, bid about $1.18 billion.

A team led by the contractor working on the first phase, Bechtel, came in second, with a bid of $1.19 billion, just $14 million more than the winner.

Engineers who did preliminary work on the second phase estimated it would cost between $1.4 billion and $1.6 billion.

Project officials will review the winning bid to make sure it is "responsive and responsible," project manager Pat Nowakowski said. It could be one to two weeks before officials announce they are satisfied with the bid and award the contract, Nowakowski said. Work could begin in July. Riders would be able to ride the Silver Line to Dulles by 2018.

Clark and Kiewit are both American companies.

"They are a local firm who does a lot of work in the area and knows the area," Nowakowski said of Clark.