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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.
I would run the yellow poly plastic gas line with a tracer wire and teflon coated risers on each end. That needs to be buried at least 18. Probably the easiest,cheapest, and most reliable as you only have 2 joints underground. You can use a teflon coated steel pipe that can be buried 12.