The sides of a 6 foot deep trench in type B soil which is sloped to prevent cave-ins should have a maximum slope angle of ________?

The correct choice indicates that the sides of a 6-foot deep trench in type B soil should have a maximum slope angle of 45 degrees from vertical. This angle is significant because it adheres to safety guidelines that are crucial for preventing trench cave-ins, which can be extremely dangerous to workers.

Type B soil is characterized by its cohesion and stability, allowing for a moderately sloped trench. A 45-degree angle from vertical represents a safe and practical sloping method for this type of soil, effectively balancing safety and excavation efficiency. Properly sloping the trench reduces the risk of soil collapse by distributing the weight and allowing for better drainage of water, which can increase soil instability.

When excavating in different soil types, the required slope may vary. Type B soil typically allows for less steep angles than other soil types that might be less stable. Understanding this distinction is crucial for excavation practices and worker safety. In this context, employing a 45-degree angle helps ensure compliance with regulations that promote safe work environments in excavation projects.