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groundwater along the East Wall. No damp areas or seeps were observed. <br /> As previously discussed, Figure 5 is a stereonet plot of the structural geologic conditions <br /> affecting the East Wall of the Spec-Agg Quarry. This plot indicates plunges of lines of <br /> intersection less than the angle of the slope face, therefore, some small wedge failures are <br /> possible. However, the development and size of these wedge failures will be limited by <br /> ' the discontinuous nature of the overall planar features of the quarry. No large potential <br /> failure wedges were apparent at the time of this investigation. <br /> It should be noted, that though no major stability issues currently exist for the East Wall, <br /> ravelling, the occasional loosening of individual rocks which roll or bounce down the slope, <br /> 1 is still possible due to weathering forces acting on the exposed face. <br /> NORTH WALL <br /> Figure 6 is a stereonet plot which represents the structural geology affecting the stability <br /> of the North Wall. The conditions of stability along the North Wall are rather rare in that <br /> ' the conditions required to produce a true plane failure are satisfied. The plane failure <br /> condition is a special case of the wedge failure (i.e. the wedge becomes a plane when the <br /> ' dip and dip direction of the two controlling planes are equal). <br /> ' The following four general conditions, defined by Hoek & Bray, must be met in order for <br /> plane failure to occur: <br /> 1. The plane on which sliding occurs must strike parallel or nearly parallel to the slope <br /> face. <br /> 2. The failure plane must"daylight" in the slope face (i.e. the dip of the plane must be <br /> ' smaller than the dip of the slope face). <br /> 3. The dip of the failure plane must be greater than the angle of friction of the plane. <br /> 13 <br />