Project Details

Supplied and installed 1100m of 2250mm dia. concrete pressure pipe in a 4m deep, drilled, blasted and excavated trench in Lake Ontario. Blasting occurred within 500m of a working marine fuel dock and within 400m of waterfront residences. Most of the marine work occurred within Dean-designed bubble curtains to control turbidity, contain blast waves and protect the environment. Full-time monitoring of turbidity and blasting activities was required by the DFO, as well as providing third-party counts of any fish killed. The concrete pipe was connected using the HydroPull technology.

The intake pipe was laid between a precast concrete riser placed and grouted into a 4.3m dia., 12m deep hole installed at the on-shore end in 5m of water and a 70t, precast concrete intake structure in 20m of water at the off-shore end. All connections and structures were vacuum-tested for water-tightness prior to the tunneling operations connecting the riser to the water treatment plant.