If a contractor uses a slope of 1h:1V for type B soil but notices sloughing from vibrations, does this indicate a "sign of distress" according to OSHA?

Using a slope of 1h:1v for type B soil refers to a specific angle of repose that is often considered safe for excavations. However, if sloughing occurs as a result of vibrations, it indicates that the stability of the excavation is compromised. According to OSHA standards, "signs of distress" can include any evidence that the excavation is failing or that soil conditions are becoming hazardous. Sloughing is a clear indication that the soil is displacing and is no longer stable, which warrants immediate attention and possible adjustments to the slope or further protective measures. Therefore, the observation of sloughing from vibrations aligns with OSHA's criteria for recognizing signs of distress in excavation safety, making this option the correct answer.