The following soil profile was identified in the boreholes:

• A fill of gravelly sand on the first 1.2m
• The natural soil was composed of silty sand with a mixture of silt and sand to a depth of 10m
• A silt beyond a thickness of more than 20m

Menard Canada carried out a Dynamic Compaction treatment by placing the high-energy phases directly under the foundations in order to meet the performance criteria in the specifications (bearing capacity of 150 kPa ELTS for the building’s conventional foundations up to 3.66mx3.66m and 100 kPa ELTS to remove it). The first 1.8m of soil had been excavated and replaced beforehand with MG112 Class A sand. The depth of the excavation reached 2.7m at the raft’s location. The underlying soils were composed of a mixture of sand and silt, and a filter point system had been set up in order to maintain the water table at 1.5m depth from the working platform and dissipate the interstitial overpressures. The 6 CPT type inspection tests and the calculations carried out showed that the performance criteria were effectively met