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4_2 Zone 4 <br /> Zone 4 has the same final grade as approved in TR 02. However,the southern portion of the <br /> upper transverse pipe was not installed. Excavation in this area generated a distinct increase in - <br /> cobble sized material with high porosity. It was determined that the installation of the upper pipe <br /> would be superfluous. The slope will drain sufficiently with the central and lower pipes. <br /> 4.2.1 Slope Stability Analysis <br /> The final grade through Zone 4, along the X2-X2' grade line, was modelled in GALENA with <br /> only the lower pipe and longitudinal pipe. The final pipe arrangement and grade have been <br /> loaded into GALENA software and evaluated for slope stability based on the material properties <br /> determined by Ground Engineering. The lowest Factor of Safety was found to be 1.35 and can be <br /> seen in Figure 7. <br /> Material Keys <br /> 1,Collurium <br /> 2:Talllnps <br /> l:We <br /> 6600 <br /> 6500 <br /> 6400 <br /> 6300 <br /> 6200 <br /> 6100 <br /> 6000 Anstysis 3 <br /> Multiple Stability Analysis <br /> Method Bishop Simplified <br /> 5900 Surface: Circular(Critical Seed) <br /> -.L.__.. ---L -- L <br /> Results <br /> 1000 Crrfic <br /> 100 200 300 406 500 600 700 �0 900 al Factor of Sdaty: 1.35 <br /> Figure 7—Zone 4 Cross Section (GALENA) <br /> z Bishops Method of Slices(Mutliple) <br /> Ralston TR 03 14 Greg l.ewicki and Associate.PIRA <br />