The glacial stratigraphy underlying Richmond Hill tells a story of ancient Lake Iroquois shorelines and drumlin fields—and with it, a subsurface where permeability can flip from tight silty till to open sand and gravel lenses within a meter. On a recent project near the Oak Ridges Moraine, perched groundwater in a sand seam went undetected until our in-situ permeability testing mapped a preferential flow path feeding the excavation. That kind of surprise is expensive. A proper field permeability test (Lefranc or Lugeon) in Richmond Hill isn't just a checkbox for the hydrogeological report; it captures the mass hydraulic conductivity that lab tests on small samples routinely miss, especially in heterogeneous overburden or fractured shale of the Georgian Bay Formation. We run these tests in boreholes across Richmond Hill to give dewatering contractors and foundation designers numbers they can actually rely on, whether for a deep basement near Yonge Street or an infiltration gallery serving a low-impact development.
A single Lugeon test in fractured Georgian Bay Formation tells you more about how the rock mass handles water than a dozen lab perm tests on intact core.
