The hydroelectric dam was located at kilometer 151.8 of the Péribonka River, immediately upstream of its confluence with the Manouane River. During the summer of 2005, Hydro-Québec awarded Menard Canada the soil improvement works including both Vibrocompaction and Dynamic Compaction. Two areas were treated in order to ensure the dam’s stability : Main Dyke and Dyke A.
The dam was located right over a glacial trough where, over time, more than 50 m of sandy and gravelly sediments accumulated in the bed of the Péribonka River. In order to improve these loose and thick natural soils under the dykes’ footprints, Vibro-compaction and Dynamic Compaction were implemented. During more than five months (2 200 hours), the 4 teams completed thousands of linear meters of vibro-compaction and compacted 3 300 dynamic compaction prints. Specifications were to achieve a minimum resistance of 125 bars measured with Cone Penetration Test over an average thickness of 22 meters.