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Precautions must be taken to assure the safety of men involved in the construction and inspection of caisson excavations. Full-length protective casing shall be provided for all personnel.
(a) Inspection personnel shall not be permitted to enter caisson excavations without full-length protective casing and evidence by means of certified gas detections that no harmful gas is present.
(b) Self-contained breathing apparatus shall be available at all times for personnel entering caisson excavations.
(c) Rescue equipment for immediately withdrawing personnel shall be continuously operative when workers are in the caisson excavation.
(Prior code § 70-12.7)