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and dip measurements of discontinuities in the quarry have been obtained. <br />Figure 4 is a stereographic contour plot of all of the data collected since 1997. <br />A total of 25 datapoints were collected from the main pit area and 49 points were <br />collected in the middle level of the quarry, along temporarily exposed north facing <br />highwalls (Figure 2, Station 2). In the southern expansion area, only a two small <br />east facing temporary walls were exposed at the time of our data collection <br />(Figure 2, Stations 3 and 4), and 23 points were collected from this mining area. <br />Slone Geometry <br />An adequate evaluation of the structural geologic conditions of the quarry must <br />also include accurate information regarding the long-term orientations of the pit <br />walls. The wall orientations utilized in this report are based on the most recent <br />mine plan developed by Lafarge West, Inc. in December, 2003 and match the <br />current Colorado Division of Minerals and Geology mine plan (Figure 5). The <br />orientations used for this analysis are the same as the 2004 report. The dip <br />direction and slope angle utilized to represent the final quarry walls are presented <br />in Table 1 below. <br />Table 1: Representative Quarry Wall Orientations <br />Quarry Wall Slope Direction of Wallttt <br />East 242° <br />Northeast 175° <br />Northwest 151 ° <br />West 091 ° <br />West 120° <br />Southwest 036° <br />Southwest 016° <br />Southeast 335° <br />Slope Angle (degrees)tz~ <br />45° <br />35° " <br />35° <br />45° <br />45° <br />45° <br />45° <br />45° <br />Note: 1: Slope orientations are presented as dip directions measured from true north (0°). <br />2: Slope angles are measured relative to the horizontal. <br />Based on lower slope angles as recommended from previous studies <br />-8- <br />