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Step 4 <br /> Determine the ratio between the critical height(Hc2) of the soil arch within <br /> the waste and the diameter (B2) of the unsupported foundation at the base of <br /> the waste layer. <br /> B2 =2r2 <br /> C2 (From Figure 2) <br /> $ <br /> 2 <br /> Step 5 <br /> . Determine the half apex angle (®2) of the cone of soil within the waste layer. <br /> Hc2 -B2(HC2/B2) <br /> 82 = Tan-1(r2 /Hc2) <br /> Step 6 <br /> • Determine the pressure (PN) over the yielding area at the base of the soil layer. <br /> FN - 1/3 Y <br /> r1 (r1 -HIT an®l) 3 +Y2(r1 -H,Tan 01)3 <br /> l Tan 81 - r,2 Tan 01 rt2 Tan 82 <br /> (7) <br />