Walk the first hour after a micro positive
Sequence containment, fact gathering, countermeasure, and verification after an environmental monitoring positive.
The moment A Zone 3 positive appears near an RTE line after drain maintenance. Product-contact results are negative, but traffic and tools crossed the area yesterday. The first hour determines whether the team preserves evidence or simply cleans away the clue. A3 sequence Current condition -> containment -> cause logic -> verified countermeasure A3 problem-solving keeps the investigation factual and visible. The goal is not to fill a template; it is to make the reasoning strong enough that another person can see why the countermeasure should work. Shortcut Clean and close A traceable countermeasure instead of a cosmetic cleanup. Do…
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