Daylighting underground utilities or Vacuum excavation
PNEUMATIC EXCAVATION
Is the process of using compressed air to disturb the earth's soil which is then vacuumed up into a debris tank. Air excavation is used to safely expose underground utilities and allows backfill with the dry material.
HYDRO EXCAVTION
the practice of digging to expose and locate underground utilities. During daylighting the hydro excavation truck will use water to break up the ground and the vacuum system to remove the soil onsite. The water and vacuum, if used properly, does not disturb or damage these existing utilities.