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<br />1 <br />The emergence of F-2 and F-3 as definitive discontinuity sets has only been identified <br />over the past few years starting as a result of the 2003 geotechnical investigation, the <br />' subsequent years investigations and the current 2008 mapping effort. Another <br />possibility to explain the variance in the foliation orientations is that localized faulting <br />within the quarry has resulted in "structural regions" or areas where the dominant <br />foliation sets occur separately, although more data are required to fully support this <br />t hypothesis. The intersection of the foliation planes (F-1, F-2 and F-3) with each other <br />will not be evaluated in the wedge stability analyses presented herein. <br />Overall, the discontinuity sets obtained by analysis of the entire dataset (i.e., 3036 <br />1 points) are consistent with the cluster analysis from previous years' individual analyses <br />(Figure 8). Both of the foliation discontinuity orientations, F-2 and F-3 are identifiable <br />' within the quarry, but have not been recorded in large enough quantities to create a <br />strong signature in the analysis of the entire dataset. However, based on the <br />' prevalence of these discontinuities in the southern expansion area, both of these <br />orientations have also been continued to be used in this analysis. <br />To adequately understand the impacts of the new data on wall stability, the planes <br />' <br />' representing each discontinuity set and the plane representing the orientation of the <br />respective quarry wall slope face were plotted. The stereographic analysis of each <br />quarry wall is presented in Figures 11 - 16. <br />' 5.2 Wedge Stability Analysis <br />As presented in previous annual reports, the method of stereographic analysis <br />' developed by Markland (1972) was used for this study. Markland's test is designed to <br />identify the possibility of a wedge failure in which sliding takes place along the line of <br />1 intersection of two discontinuities (Hoek & Bray, 1977). <br />' According to Markland's test, sliding can occur when: <br />1) The plunge of the lines of intersection is less than the dip of the slope face. <br />-13-