One of my sprinkler system valves appears to be busted but I can't locate it
since the valve box is buried in several inches of mulch somewhere. I found
one of the valvel boxes but this didn't have the valve for the zone that has
the problem. I dug around a bit in the obvious place but my lawn is too big
and it seems like an impossible task. Anyone know a better technique or
specialized equipment that I can rent to find the valve box?