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In the southern expansion area, a south facing temporary wall and a portion of a north <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />facing final wall were exposed at the time of our data collections in January 2008 (Photo <br />5), with 34 points collected from this mining area were included in this report (Figure 2, <br />Stations 2 and 3). Factors that contributed to limited exposures being available for data <br />collection included: recent and multiple snowfall events, temporary walls covered by <br />blasting debris that has not yet been removed, and efficient reclamation of exposed <br />walls by Lafarge. <br />3.2 Slope Geometry <br />An adequate evaluation of the structural geologic conditions of the quarry must also <br />include accurate information regarding the long-term orientations of the pit walls. The <br />wall orientations utilized in this report are based on the current mine plan developed by <br />Lafarge West, Inc. in December, 2003 and match the current Colorado Division of <br />Minerals and Geology mine plan (Figure 5). The wall orientations used for this analysis <br />have been the same since the 2004 report. The dip direction and slope angle utilized to <br />represent the final quarry walls are presented in Table 1 below. <br />i aoie "i . meLmeSentailye wual l y Yran v11C11Lauv11a <br />Quarry Wall Slope Direction of Wall Slope Angle 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 />3.3 Friction Angle Estimation <br />In early LF&A annual quarry evaluation reports (L&A, 1997-2002), a total representative <br />angle of friction (? + i) = 40° was used for the wedge stability analysis, where "?" was <br />-6-