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<br /> <br /> As mentioned previously for the east wall, the individual benches along the south <br />' walls with near vertical faces enable additional discontinuities to form potential <br /> wedges that may slide during the temporary condition prior to reclamation. <br />' Wedge failures limited to individual benches have been consistently observed in <br /> the past along the south walls. <br /> <br /> The newly identified discontinuity set, F-3, may facilitate some failures along the <br />' south walls that would involve either P-2 or P-4. Both of these discontinuity <br /> combinations fall within the failure envelope for both the southwest and <br /> th <br />ll <br />ll <br />t <br />ll <br />thi <br />f <br />li <br />ti <br />t <br />Additi <br />th <br />th <br />i <br />t <br />t <br /> y, on <br />, <br />on <br />sou <br />eas <br />wa <br />s. <br />ona <br />e sou <br />eas <br />wa <br />s <br />o <br />a <br />n <br />ersec <br />s <br /> discontinuities P-3 and P-6 within the failure envelope as well, The average <br />i <br />i <br />f F <br />3 i <br />i <br />l <br />ll <br />l <br />h <br />h <br />h <br />ll <br />i <br />h <br /> orientat <br />on o <br />- <br />s approx <br />mate <br />y para <br />w <br />t <br />t <br />e sout <br />east wa <br />, w <br />t <br />e <br />an <br />' average dip that is only a few degrees shallower than the southeast wall (45°). <br /> In previous annual reports, toppling about discontinuity plane P-1 also existed as <br /> another mechanism of potential block movement for the southeast wall. <br />' However, as shown on Figure 17 both the slope face and discontinuity plane P-1 <br /> no longer share the same basic strike. A review of photographs during previous <br /> annual studies does indicate that there are some continuous surfaces that form <br /> the face of the south wall. However, none of these surfaces appear to be <br /> discontinuity plane P-1, which has a dip of 72° to the south. <br />' The foliation F-1 also strikes in the same general direction as both the slope face <br />and discontinuity plane P-1, although at an overall shallower dip. It is believed <br />' that the foliation will prevent large failure surfaces from developing along the <br />south wall simply by creating a systematic set of blocks that cannot dislodge. <br />' This has been observed in the rock exposures on the south wall that have a <br />broken reverse-stepped orientation, and that also expose the undersides of the <br />' foliation surfaces. <br /> <br />