The owner or operator must maintain aisle space to allow the unobstructed movement of personnel, fire protection equipment, spill control equipment, and decontamination equipment to any area of facility operation in an emergency, unless it can be demonstrated to the Regional Administrator that aisle space is not needed for any of these purposes.
Code of Federal Regulations
[45 FR 33221, May 19, 1980, as amended at 48 FR 14294, Apr. 1, 1983]