Why soft digging wins near a line
Mechanical excavators cause most serious utility strikes, which is why state one-call programs require non-destructive exposure inside tolerance zones around marked utilities, commonly 18 to 24 inches on either side. Hydrovac excavation uses a high-pressure water jet to loosen soil and a vacuum to lift it, so the utility is exposed by sight before any bucket moves. The Common Ground Alliance DIRT report shows locate accuracy and late locates remain the top root causes of damage, which means the paint on the ground cannot be the last word.
Daylighting is verification, not theatre
A daylighting pothole shows the line's true position, depth, and crossings, including utilities the locator may have missed or marked in the wrong place. Potholing ahead of mechanical excavation on a well pad, a flowline tie-in, or a rig move converts a guess into a known. The cost of the hydrovac hour is small next to the cost of a severed gas line or a bored-through fiber cable.
The hydrovac unit needs its own checks
The tool has its own hazards: high-pressure water can cut flesh, debris tanks and hoses need inspection, relief valves must work, and the boom needs overhead clearance. The operator position, the water temperature, and the vacuum line condition are all pre-job checks, and a ground disturbance permit and one-call ticket still apply before the first cut. Soft digging does not remove the process, it makes the process safer.
Daylighting belongs in the same pre-work sequence as 811 tickets and rig move planning. If the locate, the pothole record, and the permit are three separate notes in three different notebooks, an operations audit will show which jobs actually verified the ground before breaking it.