14 Confined Spaces the development of hazardous atmospheres. • Evacuate the space and take corrective measures if any prohibited condition develops during entry (i.e., monitor alarm, hazards in or out of the space develop, symptoms of exposure experienced by entrant or observed by Attendant, etc.). STOP the entry and notify your supervisor if acceptable conditions cannot be reestablished. • Conclude work in the space by removing tools and restoring function to all systems in the space. • Evacuate the space, close all entrances and remove barricade equipment. • Conduct a post entry debriefing with all personnel involved in the entry. • Return Entry Permit to the Entry Supervisor for cancellation and retain documents for a minimum of one year.