For Type B soil, for every 1 foot of depth, how much must the trench be excavated back?

In the context of excavation for trenching in Type B soil, the requirement for sloping the trench walls is a crucial safety consideration. For every foot of depth in Type B soil, the trench must be excavated back 1 foot. This is recommended to prevent cave-ins and ensure worker safety.

Type B soils are characterized as having lower cohesion than Type A soils but stronger than Type C soils. Therefore, they require a more cautious approach in excavation practices. By sloping back the trench at a ratio of 1:1 (1 foot back for every 1 foot of depth), it helps distribute the weight of the soil above the trench and provides a stable wall that can resist shifting or falling into the work area.

Other excavation angles are recommended for Type A and Type C soils, reflecting their different physical properties, which is why the excavation requirement changes based on the soil type. By maintaining a 1:1 slope for Type B soil, it aligns with established safety standards and practices in construction and excavation.