A. Specified: If the confined space has been determined to be a "hazardous atmosphere only", as contained in section (c)(5)(i) of 29 CFR 1910.146, and it can be determined by the data on file that the only hazard posed by the permit- required confined space is an actual or potential hazardous atmosphere, the space may be entered with a written permit; provided, that the space can be maintained in a safe condition by continuous forced air ventilation alone.
B. Reclassification: A space classified as a permit-required confined space may be reclassified as a nonpermit confined space if the permit space poses no actual or potential atmospheric hazards and if all hazards within the space are eliminated without entry into the space. These spaces shall be considered as permit required until the atmosphere in the confined space has been tested, using a properly calibrated gas detector and the space continuously ventilated.
C. Atmosphere Testing: The atmosphere shall be tested at four foot (4') intervals in the direction of entrant travel and side to side, for a minimum response time as specified by the manufacturer of the test instrument being used, down to the level where work is to be performed.
D. Elimination Of Hazards: Any conditions making it unsafe to remove an entrance cover shall be eliminated before the cover is removed.
E. Barrier: When entrance covers are removed, the opening shall be promptly guarded by a temporary barrier that will prevent an accidental fall through the opening and that will protect each employee, working in the space, from foreign objects entering the space.
F. Notification To Supervisor: The designated entry supervisor shall be notified prior to entry.
G. Ventilation: Ventilation of the space shall be continuous for the duration of the entry, and shall be supplied from a clean source.
H. Smoking Prohibited: Smoking in or around a confined space is prohibited.
I. Constant Communication: Constant communication shall be maintained between the entrants inside the space and the attendant.
J. Continuous Monitoring: The atmosphere within the space shall be continuously monitored to assure that the continuous forced air ventilation is maintaining a safe atmosphere.
K. Hazardous Atmosphere Detected: If at any time during the entry, a hazardous atmosphere is detected, all employees shall leave the space immediately and contact their designated entry supervisor. (2019 Compilation)