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Judgment & ambiguity · When to act

A trench your crew is about to enter is five feet deep in soil the competent person rates borderline between two classifications, and sloping it to the safer class means re-excavating half a day's work. Do you let them in, and when?

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Nobody enters until the protective system matches the worse of the two classifications — when soil is borderline, you treat it as the more hazardous class, full stop.

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