Underground Solutions, Inc., or USI is a leader in subsurface utility exploration in Southern California. USI locates utilities using an air-vacuum excavation method that provides zero damage to the existing utilities while maximizes the holes visibility. Combining our air vac process with our PositiveID locating technology using GPR, Electromagnetic Locating and Concrete Scanning to mark, locate, and manage underground asset points; delivering the most accurate data possible, faster and more cost-efficiently than our competitors. USI partners with design and civil engineering firms, municipalities, water districts and general and engineering contractors for a variety of utility locating needs prior to actual digging on any project.