Which of the following is essential documentation to maintain during a re-entry operation?

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A permit-to-work that authorizes entry is the essential documentation. This entry permit explicitly authorizes personnel to enter a controlled space and ties together the plan, hazards, and safety controls. It names the entry team, defines the scope of work, lists required atmospheric monitoring, PPE, and rescue procedures, and sets the time window and conditions under which entry may occur. It also records who can cancel the permit and the conditions that would stop entry, providing a clear, auditable control from planning through completion. Weather forecasts inform planning but are not the live document that authorizes and governs the entry itself. Training records show qualifications but don’t authorize or control the current operation. Maintenance logs ensure equipment readiness but don’t serve as the entry authorization document.