Trenching and Soil Classification video available on OSHA’s website

image 6 - Trenching and Soil Classification video available on OSHA's website

Classifying soil is one of the steps that employers must follow to ensure that trenching work can be done safely. OSHA requires that employers have a competent person to determine the soil type and likelihood of a cave-in. This determines how to properly slope, bench, or shore the trench to prevent a collapse. OSHA’s soil classification video demonstrates how a visual inspection of a construction site’s soil is performed. It also shows the three most common methods for testing soil stability: plasticity, thumb penetration, and pocket penetrometer.


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