Is it true that a 3/4:1 slope is commonly specified for temporary excavations in stable soils?

A 3/4:1 slope, meaning a horizontal distance of 3/4 feet for every 1 foot of vertical drop, is indeed commonly specified for temporary excavations in stable soils. This slope ratio helps ensure that the sidewalls of the excavation are stable and reduces the risk of cave-ins. It is important to design slopes that are safe for workers in and around the excavation, and this particular slope is generally recognized for providing adequate support in stable conditions.

Using this slope allows for a balance of safety and operational efficiency. If excavations are too steep, the risk of collapse increases; conversely, if they are too shallow, unnecessary space may be taken up, making operations less efficient. In addition, it reflects industry guidelines and safety regulations aimed at protecting workers during excavation operations, demonstrating its acceptance within standard practices for temporary work in stable soil conditions.

The other options suggest that the slope is not commonly used as specified, which does not align with the established guidelines for best practices in excavation safety.