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204.4.4 Inspection of Excavation V Excavations must be observed daily by the "competent person". If evidence for potential cave- ins or slides is apparent, all work in the excavation must be suspended until necessary steps V have been taken to safeguard employees. 204.4.5 Operations of Vehicles Near Excavations When vehicles or heavy equipment must operate near an excavation, the sides of the excavation must be shored or braced as necessary to withstand forces exerted by the superimposed load and the earth pressure. Stop logs or other types of secure barriers must be installed at the edges of the excavations. 204.4.6 Bell-Bottom Pier Holes Employees entering drilled pier holes must be protected by a casing proportioned to sustain the maximum stresses imposed by earth and water or slurry that extends the full depth of the shaft and to the bottom of the bell. A safety cage or a shoulder harness secured to a full-time tended lifeline shall be required for entry and exit. Air monitoring and related requirements of HS- 205, Confined Space entry, shall be followed. 204.4.7 Bridges and Walkways Walkways or bridges with standard guardrails must be provided where employees or equipment are required or permitted to cross over excavations. Pedestrian walkways shall be of sufficient strength to permit a vertical deflection of no more than 0.5 inch when a 250-pound weight is applied to the center of the walkway. All bridges intended for vehicular traffic must be constructed to withstand twice the load of the heaviest vehicle expected. 204.4.8 Barricades and Fences- Excavated areas must be 'completely guarded on all sides with barricades or fences, as appropriate. If barricades are used, they must be spaced no more than 20 feet apart and shall not be less than 35 inches high when erected. A yellow or yellow and black tape, at least 0.75 inches wide, shall be stretched between the barricades. ,-, Revised: 11/93 HS-204-4 Woodward-Clyde