This project called for the replacement of the Boundary Dam Spillway near Estevan, Saskatchewan. In addition to the demolition and reconstruction of a larger spillway, this two-year, two-phase project included the reshaping of adjacent earthwork, the addition of an extensive drainage system below the spillway, and the construction of shoring and approach slabs to the exiting bridge over the spillway.
The project was awarded as a unit price contract when the design of Phase 1 was complete and Phase 2 was in concept. The schedule was threatened when groundwater information couldn’t be collected in time to complete Phase 2 design, and the resulting delayed start pushed Phase 2 well into the winter of 2009/10. PCL subsequently designed and successfully implemented measures to allow the construction of the concrete structures and installation of the rock anchors to continue throughout the winter, in preparation for completion of the spillway prior to the 2010 spring melt.