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Geocomp won the instrumentation subcontract for New York City’s Second Avenue Subway line’s 96th Street Station Heavy Civil/Structural Package contract. The Second Avenue Subway will be the city’s first major expansion of its subway system in over 50 years. When completed, the line will stretch 8.5 miles along the length of Manhattan's East Side, and will include a connection to a second subway line.
Geocomp will install a system that will monitor construction noise, vibrations, and ground movements that may affect buildings and utilities surrounding the project site. A key component of this monitoring program will be a networked series of Automated Total Stations that will provide precise, redundant measurements of the existing above-ground infrastructure.
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Data processing, presentation and reporting will be carried out using Geocomp’s proven iSiteCentral web-based data management system.
Geocomp was selected in a competitive bid to install an extensive suite of automated instrumentation to monitor Rhode Island’s aging Sakonnet River Bridge during foundation installation of piers for a new replacement bridge.
The instrumentation program includes vibrating wire and resistance strain gages installed on steel columns, girders and beams that have been identified as the most critical for the bridge’s performance and safety. Many of these sensors are monitored at high speed (50 samples per second) using Geocomp’s iSiteHS data loggers - the data are used to evaluate both dynamic and long-term changes in loads for the key bridge members.
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The program also includes automated surveying on the existing bridge abutments to detect and record differential settlement on the bridge foundation. This system is comprised of a combination of terrestrial and GPS equipment to best provide baselines for survey control.
Other components of the suite are automated vibration monitoring on the piers to evaluate the dynamic impacts of the foundation piling work on the existing bridge foundations, and automated surveying and vibration monitoring on abutter buildings/properties for construction control and disturbance mitigation for local residences and businesses.
The data for the system is fed into Geocomp’s iSiteCentral web-based data collection and reporting system enabling the project team to evaluate and interpret the data consistently across the different monitoring systems. 
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