Which of the following is not required on a pipeline marker?

• A. Pipelines are located above ground
• B. Pipelines depth underground
• C. The contents of the pipeline
• D. Emergency contact information

Answer: (B)

Pipelines are typically marked to provide critical information for safety and emergency response. Among the aspects required on a pipeline marker, it is important to identify the location of the pipeline and what it contains, as well as how to contact someone in case of an emergency.

One key piece of information that is not required on pipeline markers is the depth at which pipelines are buried underground. This information can be variable and potentially misleading since it can change along the pipeline's route due to the topography, construction, and natural wear over time. Therefore, while knowing the depth might be useful for certain applications, it is not a standard requirement for pipeline markers, focusing instead on more immediate safety concerns regarding identification and emergency protocols. The other elements—location, contents, and emergency contact information—are essential for ensuring public safety around pipeline operations.