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Section 13 Confined Space Program To the extent feasible , provision shall be made to permit ready entry and exit. Where it is not feasible to provide for ready exit from spaces equipped with automatic fire suppression systems employing harmful design concentrations of toxic or oxygen - displacing gases , or total foam flooding , such systems shall be deactivated . Where it is not practical or safe to deactivate such systems , the provisions related to the use of respiratory protective equipment shall apply during entry into and work within such spaces . In order to keep unauthorized persons safe , delineators and danger tape will be used to secure the work area before confined space entry can begin . Confined Space Operations Entry Into and Work Within Confined Spaces The requirements of this subsection apply to entry into and work within a confined space whenever an atmosphere free of dangerous air contamination and/or oxygen deficiency cannot be ensured through the implementation of the applicable provisions listed above whenever, due to the existence of an emergency, it is not feasible to ensure the removal of dangerous air contamination and/or an oxygen deficiency through the implementation of the applicable provisions of the Pre-entry subsection . Tanks , vessels , or other confined spaces with side and top openings shall be entered from side openings when practicable. Note: side openings are those within 3 1/2 feet of the bottom. Appropriate , approved respiratory protective equipment , in accordance with Section §5144 (in the California Code of Regulations) , shall be provided and worn . An approved safety harness with an attached line shall be used . The free end of the line shall be secured outside the entry opening . The line shall be at least 1 /2 -inch diameter and 2 , 000-pounds test. Exception: Where it can be shown that a safety harness and attached line would further endanger the life of the employee. At least one employee shall stand by as an attendant on the outside of the confined space ready to give assistance in case of emergency. At least one additional employee who may have other duties shall be within sight or call of the standby employee(s) . o The standby employee shall have appropriate , approved , respiratory protective equipment, including an independent source of breathing air which conforms with Section §5144 (in the California Code of Regulations) , available for immediate use .