Elevated Work Platforms (EWP) Licensing Practice Exam

What is the recommended safety distance from trenches when setting up in hard soil?

1. 2 to 1 Ratio

2. 1 to 1 Ratio

3. 3 to 1 Ratio

4. 1.5 to 1 Ratio

The correct answer is: 1 to 1 Ratio

When setting up near trenches in hard soil, maintaining a proper safety distance is vital to prevent collapses and ensure the safety of personnel and equipment. The recommended safety distance is based on the angle of repose of the soil, which is influenced by several factors including the type of soil, moisture content, and sloping within the trench. A 1 to 1 ratio means that for every meter of depth in the trench, the equipment or activity is set back one meter horizontally. This ensures adequate safety and stability when working near trenches by providing enough distance to mitigate risks associated with potential soil collapse. This ratio is considered applicable for hard soils because they generally have a higher resistance to collapse, allowing for a more direct approach compared to softer or looser soil types where greater distances may be necessary. Overall, adhering to a 1 to 1 ratio when working near trenches in hard soil helps ensure that the trench walls remain stable while providing safe working conditions for employees.