Locating is hydroexcavating (Non Destructive Digging)to locate known or unknown subsurface utilities. Similar to
trenching is most often used when the exact position of the utility is unknown. The process starts with
a pot hole, ranging from 8 to 12 inches in diameter. With the mechanical or manual vacuum system hovering the
designated area, the operator excavates down to a reasonable depth.
If the utility is not located at the anticipated
depth, an experienced operator will generally excavate an additional vertical foot then begin cutting a narrow slot
trench horizontal to the utility. This is done in 1 to 2 foot increments on either side of the pot hole until the
existing utility is located.
If after using these techniques the utility is still
not located, careful consideration should be given to referenced above-ground markings. It is not uncommon for
these useful preliminary guides to be inaccurate and grossly off the mark. The utility may be
located more than a dozen feet away from the previously evidenced or "designated” area.
One advantage that clients get with Envirogen is a
clear plan of action for the necessary discovery of specific utilities. Our experience allows us to apply a hybrid
of techniques to locate underground utilities.