consider possibility of environmental hazards (rain) in excavation.know in advance what excavation equipment and tools are needed.determine how workers will enter and exit excavation.Reasonable precautions under OHSA section 25(2)(h) obtaining utility locations before digging.worker(s) not performing work in a trench unless another worker is working above ground.requirements for when support system must be engineered.identification of soil types and applying controls as required such as: sloping, shoring or pre-fabricated, hydraulic or engineered systems.identification and locating of overhead power lines and underground services.removal of excess water from excavations.preventing persons from falling into excavation. removal of debris and excavated soil near excavation site.incidents involving vehicles and other mobile equipment.toxic, irritating or flammable and explosive gases.hazardous atmosphere (noxious gases/lack of oxygen).exposure to underground services or overhead electrical cables.excavated material or other objects falling on workers.tripping over equipment, debris and spoil.Many cave-ins occur on small jobs of short duration, such as water, gas, electrical and sewer line connections as well as building foundation repair projects.Įmployers, supervisors and workers must follow the requirements set out in the Occupational Health and Safety Act ( OHSA) and O. Workers can be critically injured or die as a result of excavation cave-ins. Health and safety inspectors apply and enforce these laws based on the facts they find in the workplace. This resource does not replace the Occupational Health and Safety Act ( OHSA) and its regulations and should not be used as or considered legal advice. Hazards involving excavations, in particular trenches, can lead to serious incidents involving workers at construction sites.
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