For excavations greater than what depth must atmospheric hazards be tested?

The correct threshold for testing atmospheric hazards in excavations is 4 feet. According to OSHA's regulations, when excavations reach a depth of four feet or more, there is an increased risk for potential atmospheric hazards, including toxic gases, low oxygen levels, and flammable vapors. To ensure worker safety, it is imperative to monitor the atmosphere within these excavated spaces at or above this depth.

This requirement is based on the understanding that as excavations become deeper, they are more likely to be influenced by factors that can affect the air quality, such as soil type, depth, and surrounding conditions. Testing the atmosphere in these situations helps prevent occupational exposure to hazardous conditions, protecting workers from health risks associated with harmful air quality. Therefore, understanding this threshold helps enforce safety standards necessary for safe excavation practices.