#ndt Infrasense, Inc., one of the leading subsurface detection firms in the nation, recently completed a ground penetrating radar (GPR) survey of an asphalt overlaid intersection in Lowell, Massachusetts. The objective of the survey was to locate voids and sinkholes in an area where a water line broke. GPR was the preferred method due to its ability to view the soil condition without requiring removal of the asphalt.

GPR data was collected every 2.5 feet transversely to cover the nearly 15,000 square foot sur
Source: NDT