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Step l <br /> Determine the ratio between the critical height ( HCl } of the soil arch and the <br /> diameter(B' )of the depression for the soil layer. <br /> B, = 2rt <br /> HCl (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 /> HC1 = B,l(Hcl /B1) <br /> 81 = Tan-l(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 /> HCI HCl -Hi <br /> r = rl(HCl _HI) <br /> 2 H Cl <br /> (6) <br />