Blue Line Extension to Largo Addison Route
Complete design and construction of a 3.1-mile mass transit cut-and-cover line and aerial structures in suburban Washington, D.C. This design-build contract involved 3.1 miles of concrete cut-and-cover double box units that serve the inbound and outbound tracks. Lane constructed several multi-span viaduct structures on concrete piers along with retained-cut, reinforced-concrete walls. Work included 112,000 linear feet of drilled piles, 325,000 square feet of steel plate lagging and 250,000 square feet of timber lagging.