How can you tell where a pipeline is located?

Since pipelines are buried underground, line markers are used to indicate their approximate location along the route. The markers can be found where a pipeline intersects a street, highway or railroad. Markers display the material transported in the line, the name of the pipeline operator, and a telephone number where the operator can be reached in the event of an emergency.

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1. How can you tell where a pipeline is located?
2. Can I move a pipeline marker sign?
3. Are markers always placed on top of the pipeline?
4. How can you recognize a pipeline leak?
5. What should I do if you suspect a leak: