Permanent markers are placed as close as practical at the entrance and exit points of facilities located underneath bodies of water where facilities are at risk of being damaged. For natural (and other) gas and hazardous liquids pipelines, these affected bodies of waters are “commercially navigable waterways” that have been defined in 49 CFR 195.450 for hazardous liquids pipelines as “waterways where a substantial likelihood of commercial navigation exists.”
Markers are used by underwater facility owners (e.g., cable, telecommunication, electric, water, sewer, and oil/gas pipelines, etc.) to indicate the presence of an underwater facility in the area. There are many excavating activities (e.g., dredging, bridge construction, anchors, directional boring, and other activities) that can damage these underwater facilities. The proper placement and maintenance of visible permanent markers raise the awareness of these facilities and reduce the likelihood of damage. Markers for underwater facilities follow local, state, and federal laws and regulations. Facility type, name, and contact number of the facility operator are included on markers for all facility types. In some cases, the facility contact is the one call center. Markers include the words “Do Not Anchor or Dredge” and/or applicable warning language.