There are many hazards that are unknown to the stump grinder as well as the homeowner. These hazards can be buried have grass growing up and over them or the stumps actually growing over top of them.
Fence posts chain link fence rebar and rocks are the main things that The stump has grown over.
Most utilities are buried deeply enough that they are not an issue.
But this is typically not the case with the irrigation lines cable television lines Homeowner installed landscape lighting gas lines or electric lines.
They usually buried very near to the surface and in some cases above the surface of the ground These Are the most commonly damaged buried obstacles
Unfortunately we cannot be responsible for damaging these items due to the unknown or unforeseen conditions on each grind site.