Slough’s expansion from a minor coaching stop to a major industrial hub fundamentally altered how we interact with the underlying ground. The historical brickmaking industry left a legacy of clay pits and variable backfill across the borough, while the natural geology—dominated by the stiff, overconsolidated London Clay Formation—presents subtle but critical mapping challenges. A standard borehole tells you what happens at a single point, but it rarely captures lateral transitions between the clay, underlying Lambeth Group sands, and perched water tables that can derail excavation budgets. For linear infrastructure and brownfield redevelopment, we deploy electrical resistivity tomography and Vertical Electrical Sounding to build a continuous resistivity model of the subsurface. When combined with targeted Spt Drilling for physical validation, the resulting ground model provides the spatial resolution that spot sampling alone cannot deliver.
Mapping resistivity contrasts across the London Clay reveals perched water and sand lenses that conventional boreholes can miss between sampling points.
