Energetic EM locating will involve actively transmitting a frequency in the underground utility’s conductive material. This is done by connecting by way of many points dependant upon the utility. We have quite a few geo-physical procedures employing a range of technologies to perform this. Our “go-to” procedures employ radio frequencies https://blissdriveteam.github.io/Bess-Utility-Solutions-Hayward/Underground-Utility-Locating-Services-Hayward-CA.html