Ground Penetrating Radar (GPR)
GPR is the newest technology for locating hard to detect utilities such as plastic pipe that is used for water and gas lines. GPR is also the most effect way for detecting voids and underground storage tanks (UST’s).
GPR works by sending a radio signal or series of signals into the ground. The returning signals provide information about changing ground characteristic with depth.
GPR is not without its limitations. GPR radio wave signals are absorbed by soils with high clay, moisture or saline content greatly limiting exploration depth. GPR effectiveness is thus site specific and varies greatly from place to place.