Purple Line Extension Section 3 Stations and Tunnels

As the last part of the transformative $9.3 billion Los Angeles County Metropolitan Transportation Authority (Metro) D Line Extension Project (formerly Purple Line), Section 3 runs 2.56-miles between the future Century City/Constellation Station site in the Century City neighborhood, to a new station on the southwest corner of the UCLA campus, then west under I-405, terminating at another new station at the U.S. Department of Veterans Affair property in Westwood.

STV is part of two design-build teams that are developing the stations and tunnels. For the station component, STV, as part of the team led by the Tutor Perini/O&G joint venture, is serving as the lead designer and systems integrator. STV is responsible for all associated civil, architectural, structural, mechanical, electrical, plumbing, landscape, track and traction power systems design for two new stations at Westwood/UCLA and Westwood/VA Hospital. Both stations will include station entrance portals equipped with stairs, escalators, elevators and bicycle parking.

For this contract, the firm is also performing all infrastructure design for the traction power, automatic train control, and communications systems, as well as specifications, and selection of tunnel ventilation fans, silencers dampers, and actuators, HVAC units, fire smoke dampers, fire dampers, pumps, and plumbing.

STV is also serving as the principal engineer and architect-of-record for the Section 3 tunnels component. The Frontier-Kemper/Tutor Perini joint venture is leading the design-build team. The final design of the project includes guideway tunnels, segmental standard tunnel lining and special seismic fault crossing tunnel lining for twin tunnels, cross passages, and connections to seismically resistant stations. The program also includes a tail track exit shaft for tunnel boring machine launching, utility relocations, ground improvement, ground settlement instrumentation, building protection and other design services during construction.

In addition to performing design services for Section 3 stations and tunnels, STV is also the principal engineering and lead design firm for the 2.59-mile Section 2 of the Metro D (Purple) Line Extension Project.

Rendering of what the stations may look like is subject to change. Images courtesy of Los Angeles County Metropolitan Transportation Authority (Metro)