Phase 2 of the Light Rail Efficiency project in Mountain View included adding a second light rail track over a distance of 3,500 feet between the west side of SR 85 overcrossing, across Central Expressway, to join the existing double track southwest of Whisman Light Rail Station. The new eastbound track provides double-tracking capabilities for the VTA light rail in Mountain View. For this project DMZ was the lead subcontractor to prime contractor B&C Transit. DMZ’s scope of work included all construction work necessary to provide a complete working light rail segment including civil, track, and systems elements. This contract also included demolishing portions of the existing Evelyn Station and modifications to the traffic signals and crossing gates at Central Expressway. Construction work was performed within Caltrain and VTA operating envelopes and under a live traction power system that required extensive coordination with the agencies. A significant portion of the work was required to be done at night and on weekends during non-revenue hours, and DMZ completed all construction work with zero negative impacts to VTA and Caltrain revenue service.
The contract consisted of the following major items of work: demolition of existing improvements for construction of new facilities; earthwork; protection of underground utilities; removal and re-installation of fencing, signs, and thermoplastic striping; removal and reconstruction of curb, sidewalk and gutter; construction of retaining wall, sound wall, ballasted track way, track underdrain; installation of VTA-furnished special track work; furnishing and installing LRT systems including additions and modifications to combined systems ductbank, traction electrification system and supporting infrastructure and foundations for signals and signal housing.