After 49 CFR 192.721, insert:
192.722w Distribution Mains: Markers. When distribution mains are located outside urban areas, their location shall be marked, recognizable to the public, at each fence line, road crossing, railroad crossing, river, lake, stream, or drainage ditch crossing and wherever it is considered necessary to identify the location of a pipeline to reduce the possibility of damage or interference.
Wis. Admin. Code Public Service Commission PSC 135.722