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Step 1 <br /> • Determine the ratio between the critical height ( HCl ) of the soil arch and the <br /> diameter(B 1 );of the depression for the soil layer. <br /> B, =2rt <br /> HCI (from Figure 2) <br /> B.I <br /> Step 2 <br /> • Determine the half apex angle 01 of the code of soil within the soil layer. <br /> Hct —BI(HCI /Bl) <br /> 81 =Tan—I(rj /HCl) <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 /> rl ` r2 <br /> HCI HC1 —H! <br /> r2 _ <br /> r,(H •1 <br /> HCl <br /> (6) <br />