For a simple slope excavation of 20 feet or less, what is the maximum allowable slope?

When considering slope excavations, it's important to ensure stability and safety. For simple slope excavations of 20 feet or less, regulations dictate a maximum allowable slope that reduces the risk of collapse.

The correct answer, a slope ratio of 3/4:1, indicates that for every vertical foot of height, the slope should extend 0.75 feet horizontally. This relatively steep slope helps maintain structural integrity while safely supporting the weight of the soil above.

In the context of slope stability, the selected ratio balances safety and practicality. A slope that is 3/4:1 is steep enough to limit the footprint of the excavation while still managing the forces acting on the soil. Such guidelines are critical in preventing landslides and protecting workers in excavation sites.

Other options present either steeper or more gradual slopes, which may not adhere to safety standards for excavations of this depth. A steeper slope, like 1/2:1, introduces significant risk factors, while a gentler slope, such as 4:1, is more suitable for deeper excavations, making it impractical for a depth of 20 feet or less. These considerations emphasize the importance of adhering to established ratios to ensure the safety and feasibility of temporary