Safety Trained Supervisor (STS) Practice Exam

Trenches that are 4 feet or deeper must be inspected how often?

1. Weekly before use

2. Daily prior to start of work

3. Only after heavy rainfall

4. Three times a week

The correct answer is: Daily prior to start of work

Trenches that are 4 feet or deeper require daily inspections prior to the start of work to ensure the safety of workers. This practice is crucial because trenching and excavation sites are inherently hazardous, with risks such as collapses, falls, and exposure to other environmental factors. Daily inspections help identify any changes in conditions that could compromise safety, such as soil movement, water accumulation, or other hazards that may develop overnight or during idle periods. The emphasis on daily checks aligns with general safety regulations and best practices in the field of excavation and trenching. By performing these inspections before work begins, supervisors can ensure that appropriate safety measures such as shoring, sloping, or benching are in place to protect workers. This proactive approach significantly minimizes the risk of accidents and enhances overall site safety.