POT HOLING is hydro
excavatingto locate known subsurface
utilities. It is similar to line locating with the exception that this approach is used when the exact position of
the utility is known. Potholing is most often used when a contractor needs to verify the depth, size or type of
underground utility. Potholing is also utilized for cathodic protection procedures or to safely excavate holes for
pole hole installations.
Like most all hydro excavation methods, the process
starts with a simple pot hole (8″ to 12″ in diameter). With the mechanical or manual vacuum system hovering the
designated surface area, the operator excavates straight down into the ground until the marked, known utility is
If the utility is not present, a GPR or Ground
penatrating Radar is usually used for accuracy. In this situation, the pot holing procedure gives way to
Trenching, one of the most efficient hydro excavation methods of locating subsurface utilities.