According to OSHA recommendations (but no formal standard), the ratio should be 1.5:1. In the United States, the answer may be 6 metres.
The distance to the top of the slope > depth of the excavation, or at least 1.5 metres.
So the answer is 1.5m
What is Soil?
The mixture of organic matter, minerals, gases, liquids, and living things that makes up soil—also referred to as earth or dirt—supports life. (In some scientific definitions, the distinction between dirt and soil is made by limiting the former term to displaced soil only.) The word pedolith, which is frequently used to describe soil, is derived from the ancient Greek word v, which means "ground, earth," and means "ground stone" in the sense of foundation stone.
In addition to a porous phase that contains water and gases (the soil atmosphere), soil consists of a solid phase made up of minerals and organic matter (the soil matrix) (the soil solution).
The three states of soil are thus solids, liquids, and gases.
To learn more about Soil
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