East River Esplanade 71st-74th Street
Technical subsurface investigation on a tidal waterfront site flanked by the FDR Drive.
Technical subsurface investigation on a tidal waterfront site, with the FDR Drive running directly alongside.
The East River Esplanade reconstruction between 71st and 74th Streets required physical verification of the subsurface conditions supporting the corridor — including the legacy timber pile and cribbing foundations.
The site made that verification technically difficult. Test pits had to reach the pile tops and cribbing, at depths that required engineered shoring. Groundwater followed the East River tides, which meant active dewatering through every pit and tide-coordinated excavation planning to keep pit faces stable and working conditions safe.
Site context added further constraint: the esplanade sits immediately against the FDR Drive, with the East River on the other side, in a tight footprint with limited access for mobilization and material movement.
Deep shored pits. Continuous dewatering. Tide-coordinated execution.
Test pits were executed across the corridor to physically locate timber piles and cribbing beneath the esplanade. Shoring systems were designed and installed for the deeper pits. Dewatering ran continuously, with excavation sequencing planned around East River tide cycles to keep pit faces stable and working conditions safe.
Landscape restoration followed each opening — rebuilt behind the work, not patched. Material transport and staging were sequenced around the constrained waterfront footprint and the FDR adjacency.
Project management held the scope together end-to-end: one team, one point of accountability.
Subsurface verification delivered. Pits executed clean. Corridor restored.
The test pit program gave the design team physical verification of the timber pile and cribbing conditions supporting the esplanade. Landscape restoration closed out every opening behind the work.
The technical difficulty of the site was real — tidal dewatering, shored deep pits, a constrained footprint with the FDR on one side and the East River on the other — and Seylone delivered the scope through it without incident.
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