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How many feet must the excavated soil, your tools, and other supplies be kept back from the excavation’s edge?
At what depth must a ladder, ramp, steps or runway be present for quick worker exit?
What is the greatest hazard facing a worker while working in a trench?
Unless a competent person indicates that there is a potential for a cave-in, at what depth is a protective system required for a trench?
A ________ is the separation of a mass of soil or rock material from the side of an excavation and its sudden movement into the excavation either by falling or sliding that could entrap, bury, or otherwise injure and immobilize a worker.
Having a pre-job discussion with all workers to review the work that will be done, the hazards that exists, and the controls and procedures that will be followed to eliminate or minimize those risks.
Cave-ins can be caused by the type of soil, adjoining buildings or walls or other structures and equipment.
The excavated area between the outside of the trench box and the face of the trench should be as small as possible.
The employer is responsible for the safe condition of materials and equipment used for protective systems.
Competent Person is one who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate them.