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Published Ground Truth entries in this archive.
A locator never lies about what it measures. It measures the field — and the field is not always centered on the line. The two mechanisms that move it are distortion and coupling, and recognizing them is what separates a mark from a guess.
A locator does not detect metal. It detects a magnetic field produced by current travelling along a conductor. Almost everything that goes wrong in the field follows from that one sentence.
A congested corridor is where every lesson in this track lands at once: coupling, distortion, non-conductive lines, unreliable depths. No single method survives it. A sequence does.
A plastic pipe with no tracer wire gives an EM locator nothing to work with. The honest answers are a sonde pushed through the line, radar from the surface, or admitting the line can't be traced today — and knowing which applies is the skill.
A tracer wire is the cheapest component on the job and the one that decides whether a plastic line can ever be traced again. Most tracer wire problems were installed, not developed — and a locator inherits all of them.
The Common Ground Alliance's annual damage data is out, and the direction is the wrong one: a record-high index, telecom and gas absorbing 87 percent of reported damages, and the same root causes as every year before.
Two standards changes that quietly invalidate boilerplate: the SUE standard was replaced and retitled in 2022, and residential post-tensioned slabs picked up a code reference in the 2024 IRC.
The paint and flags on a job site are a standardized language. Eight colors, each with a defined meaning, plus a set of conventions for what the marks are actually telling you about position, depth and age.
A Missouri consent judgment reported in May 2026 is worth reading by anyone whose job involves telling somebody else that a site has been marked.
A trench discovers its mistakes one shovel-width at a time, in the open. A bore makes its mistakes in the dark, at depth, and tells you about them later. The locate has to be built for the difference.
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