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and dip measurements of discontinuities in the quarry have been obtained over <br />the past 10 years. Figure 4 is a stereographic contour plot of all of the data <br />collected since 1997. <br />In the southern expansion area, only a single south facing temporary wall was <br />exposed at the time of our data collection (Figure 2, Station 2), and all 18 points <br />were collected from this mining area. Factors that contributed to limited <br />exposures being available included: recent and multiple snowfall events, <br />temporary walls covered by blasting debris that has not yet been removed, and <br />efficient reclamation of exposed walls by Lafarge. <br />4.2 Slope 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 have been the same since the 2004 report. <br />' The dip direction and slope angle utilized to represent the final quarry walls are <br />presented in Table 1 below. <br />ranee ~: rcepresen>:atrve i.tuarrv wan urren>:airons <br />Quar Wall Slo a Direction of Wall ~ Slo a An le de rees z <br />East 242° 45° <br />Northeast 175° 35° <br />Northwest 151° 35°` <br />West 091 ° 45° <br />West 120° 45° <br />Southwest 036° 45° <br />Southwest 016° 45° <br />Southeast 335° 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 />-$- <br />