SamCarnaggio (By Gerald Martineau / The Washington Post) Sam Carnaggio has been part of the Silver Line project team for more than a decade. (File photo by Gerald Martineau / The Washington Post)

One of the top executives responsible for overseeing construction of the first phase of the Silver Line rail project announced this week he is retiring.

Project director Sam Carnaggio’s move is one of many personnel shifts taking place as construction on the second phase of the rail line moves forward under new leadership. His announcement comes the same week that the Silver Line’s new executive director Charles Stark began his duties.

In a written statement, Jack Potter, president and chief executive of the Metropolitan Washington Airports Authority, which is overseeing Silver Line construction said: “Sam provided key leadership for this project over the last decade.  We are grateful for his service and we wish him well.”

In the same statement, Stark, the project’s new executive director also praised Carnaggio’s work.

“Congratulations to Sam on his retirement and I thank him for his leadership and success on Phase 1,” Stark said. “I am confident that the Phase 1 close-out team established by Sam will diligently work with our stakeholders to finish all outstanding issues in order to fully complete Phase 1.”

Since the first phase of the $5.6 billion opened July 26, Carnaggio has focused his energies on leading the team that is closing out that phase of the project. It’s a complex and lengthy task that involves working with the project’s contractor Dulles Transit Partners and the Washington Metropolitan Area Transit Authority to finish the work on the rail line and to review outstanding claims and expenses. The $2.9 billion first phase is $150 million over budget, but some watchers believe the costs will increase once the final bills are totaled and claims are settled.

Carnaggio’s last day will be Sept. 18.

According to officials at the Metropolitan Washington Airports Authority, which is overseeing construction of the rail line, Al Kolodne, will serve as the new Phase 1 close-out director. Kolodne also serves as WMATAliaison for the entire Silver Line Project.

Carnaggio, 66, is a seasoned transportation expert with more  than 30 years of experience in developing, overseeing, planning, designing and building major capital transit projects throughout the country. He also worked for the Federal Transit Administration. He has been part of the Silver Line team for more than a decade.

The first phase of the Silver Line included five new stops — four in Tysons Corner and one in Reston at Wiehle Avenue. Construction on Phase 2 has already begun and is expected to be completed in 2018. The second phase, expected to cost $2.7 billion will have six stops, including one at Dulles International Airport and will provide a Metro link to communities in eastern Loudoun County.