Which type of soil can be benched according to the guidelines?

Benching is a construction technique used for sloping and supporting excavated areas to prevent cave-ins. According to the guidelines established by OSHA and other regulatory bodies, Type B soil is considered suitable for benching due to its moderate stability.

Type B soil typically includes silty or sandy loam that may be slightly cohesive but does not have the same structural integrity as Type A soil. It can typically withstand some degree of excavation without excessive risk for collapse, allowing for safe benching practices. The recommended benching ratios (a horizontal measurement to vertical height) ensure that the walls of the excavation remain stable while allowing for a safe working area.

Type A soil, while stable, is generally not recommended for benching due to its cohesive properties that require more stringent safety measures. Type C soil, being the least stable, does not allow for safe benching because of its loose granular nature, which can easily lead to collapses. Therefore, the correct answer reflects the guidelines that enable safe and effective benching practices for Type B soil specifically.