Electronic Pipe Locators are the main method used to locate buried metal facilities or locator wires on polyethylene pipe.

• A. Ground-penetrating radar
• B. Visual inspection
• C. Acoustic detection
• D. Electronic Pipe Locators

Answer: (D)

Electronic Pipe Locators are the main method because they provide an active signal that can be traced from the surface to the buried pipe or tracer wire, giving a clear path and depth estimate. For buried metal facilities, the pipe itself conducts the signal, or a transmitter is attached to it, allowing the receiver to follow the underground route. Polyethylene pipe, being non-metallic, wouldn’t carry a signal unless a tracer wire is installed along its length; that wire creates a detectable path for the locator to follow, making the locator approach the standard practice for locating such pipes before digging. Ground-penetrating radar can detect subsurface features, including some non-metallic pipes, but it’s slower, more expensive, and requires more interpretation, so it isn’t the default method. Visual inspection can’t reveal buried lines, and acoustic detection is used for other purposes like leak sounding rather than precise locating.