Project overview
Deep-shaft excavation and ground freezing monitored for City Tunnel No. 3 and Delaware Aqueduct connections.
A major municipal water delivery modernization program executed by the New York City Department of Environmental Protection (DEP) to expand network redundancy. The initiative encompasses deep-shaft excavation, ground freezing, structural liner construction, and surface distribution chamber integration for City Tunnel No. 3 (Stage 2) and Delaware Aqueduct connections, securing long-term drinking water conveyance across the five boroughs.
Instrumentation & services deployed
10 types
PS
Pre- & Post-Construction Condition Photo Survey
AMTS
Automated Motorized Total Station
AOP
Airblast Overpressure Microphone
ACM
Automated Crackmeter
CG
Manual Crack Gauge (Tell-Tale)
DMP
Optical Deformation Target / Monitoring Prism
INC
Inclinometer
NM
Real-Time Sound Level & Acoustic Monitor
SG
Strain Gauge
VM
Vibration Monitor
Instrument codes follow the legend on the Projects index. Detailed scopes, contract values, and references available on request.
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