Replacement Of The Five Fingers Marine Outfall

Regional District of Nanaimo
Nanaimo, BC

A McNally JJM Five Fingers JV was formed to carry out the Replacement of the Five Fingers Marine Outfall Project for the Regional District of Nanaimo. The work consisted of providing general contracting services for the supply and installation of just over 2 km of 1372 mm diameter HDPE pipe complete with associated anchors and fittings to replace the existing Hammond Bay marine outfall from the Greater Nanaimo Water Pollution Control Centre. The diffuser for the outfall is located in approximately 75m deep water in the Strait of Georgia.

Work included underwater drilling, blasting and excavating to create the necessary trench for the transition between land and sea for the outfall, and preparing the outfall pipe. The HDPE pipe sections were fused together, kept airtight in order to float and the concrete weight assemblies attached, creating two assemblies approximately 1,800 m and 200 m in length, respectively. These assemblies were then towed to the installation site at Hammond Bay, where they were joined together, carefully sunk into position, and tied into the on-shore section to form the completed outfall.

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