The John Hart Dam and Generating Station are located on the Campbell River system, approximately 5 km upstream from Discovery Passage, immediately to the northwest of the City of Campbell River. BC Hydro is proposing to replace the John Hart Generating Station, a 126 megawatt facility, with a new 135 megawatt generating station, and replace the surface-mounted pipelines and penstocks with a tunnel.
In 2011, BC Hydro (BCH) conducted subsurface site investigations in the John Hart Reservoir to examine the feasibility of a proposed tunnel alignment. As part of these on-going investigations, BC Hydro contracted Klohn Crippen Berger Ltd. (KCB) to provide recommendations on geotechnical requirements for future design phases.
In-water drilling works in the John Hart Reservoir were conducted to identify the sub-bottom bedrock profile in strategic areas. ECODynamic Solutions (EDS) Inc. was retained by BCH, to provide input on the Environmental Management Plan (EMP) and deliver third party environmental monitoring services. The key Contractor task involved deploying an HT750 track mounted drill on an anchored barge, conducting drilling and managing drill fluids such that there were no releases to water of any kind, and no impacts to the municipal drinking water system (meters away) or fisheries values in the reservoir. EDS utilized a hydrophone to monitor acoustic impacts of some preliminary drill casing hammer work.
The project was successful in attaining the geotechnical information and achieving the environmental protection objectives set for the John Hart Reservoir.