Mobile Home Park with water taps nowhere to be found!

[Theresa P.]

I am working on a mobile home park right now and need to hook up a vacant home to plumbing (I am not a plumber). I have called several plumbers and they each say that the drain/taps for water (it's connected to city water and sewer) are buried underground and they cannot find them. I've called the water department to try and get them to help me figure out where the tap is, but no one knows! Does anyone have a good way to figure out where access taps are when they're buried underground?