Safety Trained Supervisor in Construction (STSC) Practice Exam

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How is "trench excavation" defined by OSHA?

A wide trench not exceeding 10 feet in depth
A broad excavation greater than 20 feet
A narrow excavation where depth exceeds width but not greater than 15 feet
A shallow trench with no defined width

The correct answer is: A narrow excavation where depth exceeds width but not greater than 15 feet

According to OSHA regulations, "trench excavation" is defined specifically as an excavation that has a depth greater than its width, and where the width of the trench does not exceed 15 feet. This definition emphasizes the characteristics that distinguish a trench from other types of excavations. In this context, it's essential to note that the depth-to-width ratio is critical because it directly relates to safety measures required to protect workers from cave-ins, which are more likely in narrow, deeper excavations. Trenching operations require specific safety protocols due to the increased risks associated with the structure of the excavation. The other options fail to meet the regulatory definition due to inaccuracies regarding depth, width, and the dimensions typically associated with trench excavations. Understanding this definition is crucial for ensuring compliance with safety standards and protecting workers in excavation situations.