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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.
When working around buried facilities, remember that main lines are typically at least 2 feet deep while service lines are only at about 18 inches deep. Existing grades can change and the current depth may be different when it first was installed. Use clearance guidelines when working around these types of facilities.