Ground Penetrating Radar (GPR) is used to measure changes in the dielectric properties of subsurface materials. Quality Geophysics uses GPR to delineate subsurface features such as underground storage tanks, buried drums, and utilities. GPR is also used to locate karst-related voids in the subsurface. Other applications include mapping landfilled and excavated areas and site stratigraphy.

GPR can be used in non-destructive testing (NDT) to assess cement voids, rebar locations and corrosion.