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gas lines are usually buried 450 and 600mm deep. Gas to a house is most likely around 18 inches for the house line around 30 to 36 gas main and water is around 3 to 4 feet towards the north where it gets cold. I guess you know the electric and phone could be buried too.
The left-to-right gap, near the top of the contour map indicates a Fault line. This fault line is between the blue/green contour lines and the purple/red/yellow contour lines. The thin red circular contour line in the middle of the map indicates the top of the oil reservoir. Because gas floats above oil, the thin red contour line marks the gas/oil contact zone.