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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.
Most utilities are buried an average of 3 feet in most of this country due to the frost line. Places like Mn. where I am at now are 4 to 6 feet down. For fencing you do not need to go very deep.