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Shallowly Buried. Gas lines can be as shallow as 12 inches below the surface. Plastic lines need to be at least 18 inches in some areas and require a metal wire to be wrapped around them. This allows a pipe finder to locate the pipe if necessary. The gas lines run to a meter that is normally located on the side of the house.
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.