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Step 1 <br />• Determine the ratio between the critical height ( HCI ) of the soil arch and the <br />diameter (B' ) of the depression for the soil layer. <br />H C1 (from Figure 2) <br />Bt <br />Step 2 <br />Determine the half apex angle 81 of the cone of soil within the soil layer. <br />Hct = B1(HC /Bl) <br />81 = Tan -I (rl / HCI) <br />Step 3 <br />• Determine the radius (r2) at the base of the waste layer that remains unsupported <br />by the arch within the soil layer. <br />I r2 <br />HC1 HC1—H l <br />_ rl (HCI — Hi ) <br />r2 H c1 <br />C <br />(G) <br />