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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.
In terms of underground natural gas facilities, excavators will deal with different gas lines with different colors, materials and sizes. Natural gas lines typically range from Â½ inch to 30 inches in diameter with pressure from 15 pounds per square inch to 1,000 pounds per square inch. Materials used can include copper, steel or polyethylene.