Line Markers and Signage for Hazardous Liquid Pipelines and Facilities Addresses the permanent marking of liquid petroleum pipeline transportation facilities. It covers the design, message, installation, placement, inspection, and mainte c e of markers and signs on pipeline facilities located onshore and at inland waterway crossings. Markers and signs indicate the presence of a pipeli ne facility and warn of the potential hazards associated with its presence and operation. The markers and signs may contain information to be used by the public when reporting emergencies and seeking assistance in determining the precise location of a buried pipeline. The provisions of this recommended pr actice cover the minimum marker and sign requirements for liquid petroleum pi peline facilities. Alternative markers, which are recommended for some loca tions under certain circumstances, are also discussed. The pi peline operator is respons ible for determining the extent of pipeline marking. Cons ideration should be given to the consequences of pipeline failure or damage; hazardous characteristics of the commodity being transported; and the pi peline's proximity to industrial, commercial, residential, and environmentally sensit ive areas. The pipeline marking programs are also integral parts of the pipeline operator's mainte ce and emergency plans. This recommended practice is not inte nded to be applied retroactively. Its recommendations are for new construction and for normal marker mainte ce programs subsequent to th e effective date of this edition