For excavations 12 feet or less in depth, what is the maximum allowable slope?

For excavations that are 12 feet or less in depth, a maximum allowable slope of 1/2:1 (run:rise) is established to ensure safety and stability. This means for every half unit of vertical rise, there should be one full unit of horizontal run. This slope ratio is designed to reduce the risk of soil movement and potential cave-ins, which can occur in steeper slopes, especially in loose or unstable soils.

The 1/2:1 slope provides a balance between safety and efficiency, allowing for more straightforward excavation within this depth range without compromising the structural integrity of the excavation site. This guideline is in accordance with safety regulations and best practices in excavation work, aimed at protecting workers and ensuring that the walls of the excavation do not collapse.