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required slope is about 5,000 cubic yards, which is about the ~~ <br />amount of rock that it will require to complete the excavation of <br />• the tunnel (see attached computation sheets for details). <br />Reclamation of the pad after final closure will require a further <br />approximately 5,000 cubic yards of rock. <br />The stability of the extended pad has been computed using a IIj1 <br />bilinear wedge analysis (see attached computation sheets). The ((~~ll <br />computed factor of safety for the extended pad is 1.82, greater <br />than the 1.5 factor of safety required in the regulation. <br />Computations have been performed assuming drained conditions, due <br />to the depth to the water table, and the expected high permeability <br />of the materials. <br />4.3 #2 Portal pad <br />Portal #2 pad will also be extended to the north, with the facel'~ <br />slope being flattened from the current 35° to the somewhat less <br />than required 2h:ly (26.5°). The plan of the extension is <br />presented on Figure 3, together with a cross section through the <br />thickest portion of the pad. <br />The volume of material that would be required to achieve the <br />required slope is also about 5,000 cubic yards, to complete the II~ <br />excavation of the tunnel (see attached computation sheets for <br />• details). 'Reclamation of the pad after final closure will also II <br />require a further approximately 5,000 cubic yards of rock. <br />The stability of the extended pad has been computed using a sliding I <br />block analysis (see attached computation sheets). The computed <br />factor of safety for the extended pad is 2.04, greater than the 1.5 IIi <br />factor of safety required in the regulation. A drained assumption <br />is again made. <br />Adrian Brown Consultants -9- 1145/900531 <br />