Wire, cable and water line locating.
Stumpgrinding, concerning locating electrical wiring, TV cables, water lines, irrigation lines, there is a simple solution, I've used for 10 years, and it;s fool proof.
I use wire devining rods, home made, here's how:
For locating water lines, water supply, irrigation, ect. Take a steel coat hanger, straighten, cut to an 18 inch overall straight length, bend at a 90 degree angle in the center, 9 inches each leg. Make two of these. Hold at waist level, with wires held loosy in each hand about 8 inches apart, with the forward pointing wires at a horizonal position. The wires should be shaped like a "L". Hold the verticle ,"handles", loosy, allowing the wires to pivot easily.
Walk slowly across the ground around the stump to be ground. The horizonal wires, pointing directly forward will cross like an X when you cross a water line, any water line, supply or irrigation. You can try this anywhere, mabe in your own yard, practice makes perfect. It has never failed me in 10 years.
To locate electrical , or underground cables, use brazing rods, with flux removed, I use a wire brush on a bench grinder for this, cut these at 20 inches, bend at a 90 degree bend, with bend at 8 and 12 inch, using the 8 inch legs for horizonal forward pointers, held 8 inches apart. They will cross when they cross a wire of any kind.
This method will work, never fails, and at times when commercial locating services have markedthe utility runs, I find their mistakes, or wrong markings, so I double check them with my system, which never is wrong, try this at home, practice makes perfect, haven't hit anything in years, Oh!, the steel water line finder,( steel coat hanger), will find PVC also.