The Rio Tinto Alcan Kitimat Modernization Project is a $3.3-billion project to expand the Kitimat Works aluminum smelter with state-of-the-art technology to achieve a leading-edge, highly efficient and world-class operation in British Columbia. As part of this project, there was a need to complete tunnel maintenance and repairs on the Kemano penstocks which had not been completed since the mid 1950’s.
The scope of work for the project was the water diversion of one tunnel to the other for inspection and repair purposes. The work involved excavation of temporary and permanent galleries between two existing hydropower tunnels, excavation and construction of valve chambers, replacement and installation of eight new 3 m diameter valves, welding and concrete backfill with steel pipes (3 m diameter) and connection of new lines to the existing penstocks.
Allnorth’s scope of work was the provision of materials testing services for concrete and shotcrete.