Drummondville sits on the St. Lawrence Lowlands, where thick marine clay deposits — known as Leda clay — dominate the subsurface. These clays are highly sensitive and can lose strength rapidly when disturbed, making slope stabilization design a critical step before any cut or fill operation. Freeze-thaw cycles add another layer of complexity, with spring thaws often triggering shallow slides. Our team evaluates each site using borehole data and lab testing to model failure surfaces accurately before recommending a solution. Complementing this work with a [MASW survey](/masw-vs30/) helps us map stiffness contrasts across the property without drilling extra holes.
Leda clay in Drummondville can lose 80% of its undrained shear strength upon remolding — that is why stabilization must start with a proper site investigation.