NYC MTA Selects Geocomp for Second Avenue Subway Expansion

Geocomp, a Sercel business specializing in infrastructure monitoring, has been contracted by the Connect Plus Partners, JV to deliver geotechnical and structural monitoring for Phase 2 of New York City Metropolitan Transportation Authority’s (MTA) Second Avenue Subway, one of the most complex transit infrastructure projects in North America. The 40-month contract reflects the long-term scope and critical importance of monitoring throughout construction.

This phase of the project will extend the Q line north into East Harlem, requiring excavation of an existing cavern at 116th Street, upgrades to active stations, and construction of new tunnels and underground access points. Operating beneath such a dense urban environment requires a precise understanding of how the ground and nearby structures respond during construction.

Geocomp will combine automated and manual monitoring systems to track surface and subsurface movement in real time. All data will be delivered through iSiteCentral®, the company’s secure, web‑based platform, giving project teams clear, timely insight to support safe construction, regulatory compliance, and rapid decision‑making.

Sean P. O’Brien, PE, President of Geocomp, said: “Projects of this scale demand more than the best data and technology, they require comprehensive expertise. With decades of experience on complex subway and tunneling programs in New York and around the world, we know how critical it is to continuously understand ground and structural behavior. Our role is to work closely with the project team to determine what matters at each stage and translate monitoring information into insight that supports confident, timely decisions.”