Ex and Trench
Before workers enter a trench, what is the first thing that must be checked to ensure safety?
What is "soil stability and the need for protective systems"?
What is the primary purpose of shoring in excavation and trenching operations?
What is "to prevent trench walls from collapsing"?
What type of soil is considered the most unstable and requires special protective systems in trenching?
What is "Type C soil"?
What is one of the most common underground hazards that can be encountered during excavation?
What is "unidentified utility lines"?
What is the first thing you should do before starting work in a trench?
What is "Make sure the trench is safe"?
What is the minimum depth at which a trench requires a protective system, according to OSHA standards?
What is "5 feet"?
What is the required strength of shoring to support the walls of a trench?
What is "the shoring must be designed to withstand the weight of the soil, equipment, and any additional load"?
What should be done if the soil in a trench shows signs of being unstable or loose?
What is "installing a protective system, such as sloping or shoring"?
If workers are digging near underground utilities, what must be done before beginning excavation?
What is "locating and marking all utilities"?
What should be used to keep the sides of a trench from collapsing?
What is "shoring or trench boxes"?
What is the main purpose of using trench boxes or shields in excavation work?
What is "to prevent cave-ins and protect workers"?
What type of shoring is used to push against the walls of a trench to prevent collapse?
What is "hydraulic shoring"?
Which soil type is most stable and generally does not require a protective system in a trench less than 5 feet deep?
What is "Type A soil"?
What underground hazard poses a serious risk of cave-ins, especially in older urban areas?
What is "unmapped or outdated underground infrastructure"?
What is the main danger in a trench?
What is "a cave-in"?
What must be done if a trench is over 20 feet deep in order to keep workers safe?
What is "having a registered professional engineer design the protective system"?
When should shoring be inspected during excavation work?
What is "before each shift and after any event that may affect its stability, such as heavy rainfall"?
When working in soil that is between Type A and Type C, which protective system is commonly used to prevent collapse?
What is "sloping or benching"?
When working near underground electrical cables, what should be done to avoid the risk of electrocution?
What is "de-energizing and grounding electrical lines, or using proper protective equipment"?
What must you do if you see cracks in the walls of a trench?
What is "stop work immediately"?
If workers are working near a trench with nearby traffic, what should be used to protect them from being struck by falling objects?
What is "a barrier or warning system"?
What is the OSHA requirement for shoring when working in trenches over 20 feet deep?
What is "a professional engineer must design the shoring system"?
If there is water or moisture in the soil, what must be done to ensure trench safety?
What is "increased sloping, shoring, or installation of a dewatering system"?
What is the risk of encountering gas lines during excavation, and what safety measure should be taken?
What is "the risk of explosion or asphyxiation, and using gas detectors or calling utilities before digging"?
If you’re digging a trench and you find a treasure chest filled with gold, what should you do?
What is "Quit"