EM locators use an electromagnetic radio frequency transmitter and receiver to establish utility strains. The transmitter sends out a radio signal in a particular frequency, which transmits throughout the conductive substance within an underground pipe or other bit of infrastructure. We are able to generally locate utilities nearly 15ft deep; https://cloudasset.s3.amazonaws.com/Bess-Utility-Solutions-Hayward/Utility-Detection-Hayward-CA.html