When potholing, utility crews use a transportable vacuum excavator. Initial, test holes, usually measuring 6 to twelve inches deep, are made along the line exactly where they want to dig or begin building. They excavate soil with large-pace suction straight down till the utility line is partly uncovered. Air excavation https://cloudasset.s3.amazonaws.com/Bess-Utility-Solutions-Hayward/Potholing-Utilities.html