RHD Utility Locating provides underground utility locating, ground penetrating radar (GPR), and video pipe inspection services. RHD Services has been providing subsurface utility information to our clients since 1990 and Ground Penetrating Radar (GPR) services since 2000. Often it is necessary to know the exact depth, size, or material of the underground utility. This can be accomplished using a non-destructive method of digging known as Vacuum Excavation. This method uses either high pressure water or air to loosen and disturb the soil. A high suction vacuum then removes the soil.