Dulles International Airport APM Tunnel

Washington Dulles International Airport’s $3.4 billion D2 Development Program will improve the airport facility to handle increased airport traffic. The D2 program includes a network of tunnels for new systems including:

• An Automated People Mover (APM) system
• A pedestrian tunnel
• Underground baggage conveyors
• Underground roads for the airport tugs
• Utility tunnels

The APM System replaced most of the Mobile Lounges that transport passengers between the terminal and concourses.  The lounges will continue to be used to serve aircraft that do not have access to gates and for unscheduled or emergency situations.

Phase 1: Detail Design and Design Management for the APM, baggage, and tug tunnels. HMM’s scope included tunnel structures, mechanical/electrical systems, ventilation systems and fire/life safety design for all tunnels and the Vehicle Maintenance Facility.  All design elements were progressed through feasibility studies and analysis of alternatives to 60% completion. In addition, HMM performed management and design coordination of security and communication systems for both the tunnels and vehicle maintenance facility. However, following the events of September 11th, the Authority, like all airports nationwide, was required to reevaluate its construction plans. Decreased passenger figures and new security requirements caused some adjustments to prioritizing projects and schedule. The first segment of the APM connecting the Main Terminal and Concourses A, B, and C, was openened in January 2010.

Phase 2: Following a reassessment and updating of the deferred Phase 1 work to suit current airport requirements, HMM lead a team of 10 subconsultants to complete the design of the 1875 ft long, 40 ft wide NATM Pedestrian Tunnel Extension, 2,800 ft long twin 35 ft diameter TBM tunnels that link to a 700 ft long cut and cover tunnel for a baggage conveyor system and a 2,400 ft long extension of the West APM Twin NATM Tunnels.