Peter Kiewit Sons Co., a subsidiary of Kiewit Corporation, was awarded this C$17 million project that involved excavating more than 280,000 cu. meters of material from the left abutment to provide access for construction of a 4,700-sq.-meter slurry cutoff wall. More than 12,000 cu. meters of roller-compacted concrete was placed on top and up the slope of the slurry wall. The roller-compacted concrete was then protected with a 60,000-cu.-meter zoned embankment consisting of an impermeable blanket, sand filter zone and a shot rock shell.
With all work being constructed in an active drinking water reservoir, an extensive pumping and settling pond system was developed to divert and treat contaminated water and prevent entry into the reservoir. The reservoir was gradually drawn down during construction to allow all work to be performed under dry conditions.
Excavated materials were processed on site into concrete aggregates and embankment materials. A site-specific high water evacuation plan was developed for the project and the job was successfully evacuated three times. Associated work included landscaping and instrumentation.