Florida Fire State Practice Exam 2025 - Free Firefighter State Exam Practice Questions and Study Guide

In the context of a trench incident, a secondary hazard refers to a risk that may arise as a result of the primary incident. While all of the options listed can potentially present dangers in various situations, the likelihood of a secondary collapse is particularly relevant to trench incidents.

When a trench is undermined or improperly supported, the soil can become unstable. After the initial trench collapse, the surrounding materials may also give way, leading to a further collapse. This is especially dangerous and can pose significant risks to any personnel who may be inside or near the trench at the time. The forces involved in the soil structure can cause a domino effect, exacerbating the risk of injury or entrapment.

This potential for further collapse emphasizes the importance of maintaining proper shoring or bracing and conducting thorough safety evaluations before any work begins. Understanding the risks of secondary collapses allows responders and workers to implement appropriate safety measures, thereby reducing the overall risk during trench operations.