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collected were analyzed using the Schmidt, equal area projection method. This method <br /> allows the traces of geologic discontinuities to be represented on a two dimensional <br /> surface by the construction of poles and great circles that define the dip and dip direction <br /> of the discontinuities (Ibid). <br /> For this project analysis, 134 discontinuities were mapped from the four main walls of the <br /> iquarry. The poles representing these features are shown in Figure 3. The figure was <br /> generated using the SpheriStat stereonet plotting utility by Pangea Scientific, Inc. The <br /> concentration centers of the measured discontinuities were then located by contouring the <br /> pole plot (Figure 4). Based on the results of this contouring, six predominant geologic <br /> discontinuity planes were identified and defined by their dip azimuth and dip angle from <br /> the horizontal: <br /> P-1. 172/46 Represents rock mass foliation <br /> P-2. 090/63 <br /> 1 P-3. 256/78 <br /> P-4. 287/71 <br /> ' P-5. 337/87 <br /> P-6. 035/67 <br /> As a first principal, one must accept that in a hard rock quarry such as the Spec-Agg <br /> Quarry, the rock mass stability is controlled by the existing discontinuities. To evaluate <br /> the stability and interaction of these discontinuities relative to each quarry wall, the great <br /> circles representing each of these discontinuities and the great circle representing the <br /> orientation of the respective quarry wall slope face were plotted for each wall. The azimuth <br /> 1 and slope of each wall were defined as shown below. The South Wall was further defined <br /> by four separate orientations based on current and future mining activity. S1, S2, and S3 <br /> represent separate faces of the current South Wall configuration. While S4 represents the <br /> long term orientation of the South Wall. <br /> 1 7 <br />