North Gorge Interceptor Obstruction
Evaluation/Remediation

Very restricted access into the obstructed section of the NGI, together with health and safety concerns, demanded creative data collection efforts in the field to characterize the problem. Information was obtained using innovative technology, including: Chemical tracers, topographic surveys, video inspection, and sub-bottom profiling sonar.

The efforts led to the conclusion that, rather than a single obstruction such as a crown collapse, a long-term accumulation of debris had built up along the tunnel, severely restricting the flow of wastewater. O’Brien & Gere provided construction management and supervised construction activities. Services included: Coordinating and attending periodic progress meetings , providing back-up technical direction, and maintaining communications with the City and interested parties/monitoring the contractor’s activities.

City of Niagara Falls

Niagara Falls, NY

Located and quantifed the obstruction

Integrated technical, financial, organizational, and public outreach process

Identified key problems

Prepared plans and specifications to correct the problem