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nnovative onstruction olutions • Trenches greater than 4-feet deep shall be provided with a ladder, stairway, or ramp positioned so that the maximum lateral travel distance is no more than 25 feet . • The atmosphere of excavations greater than 4 feet deep shall be tested prior to entry when a hazardous atmosphere exists or could reasonably be expected to exist, such as excavating landfills, hazardous waste dumps ; or areas containing sewer or gas utility systems, petroleum distillates, or areas where hazardous substances are stored nearby . • Spoil piles, material , and equipment must be kept at minimum of 2 feet from the edge of the excavation , or a retaining device must be used to prevent the material from falling into the excavation . • Excavations shall not be entered when : o Protective systems are damaged or unstable ; o Objects or structures above the work location may become unstable and fall into the excavation ; o The potential for a hazardous atmosphere exists, unless the air has been tested and found to be at safe levels ; or o Accumulated water exists in the excavation , unless precautions have been taken to prevent excavation cave - in . • The excavation self- assessment checklist shall be used to evaluate excavations prior to entry . 4 . 2 . 25 STEEP GRADES The project site is on level ground . 4 . 2 . 26 SLIPPERY SURFACES • Be aware of changes in elevation and changes in walking surfaces . • Walk, don ' t run through work areas . • Warn others that a hazard exists by placing signs or cones or by isolation with caution tape or barricades . • Clean up, correct, remove, or report unsafe conditions such as broken concrete , piping, and other hazards that could result in a slip/trip/fall injury . • Notify superintendent and clean up all puddles and or mud . 4 . 2 . 27 UNEVEN TERRAIN / UNSTABLE SURFACES Uneven Terrain/ Unstable surface may include changes in grade, and excessive ground cover or 37