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A summary of the data gathering process is given in Table 1. The first column <br />~• designates the line or area number for each group of collected data in our field notes. The <br />second column defines the Hazard Zone in which this group of data falls for the purposes of <br />l slope design. The other columns give the number of fractures mapped, the strike of the <br />outcrop, and the conversion of the face orientation to dip direction and dip. <br />4.2 Statistical Validity of Data <br />1 <br />Statistical validity of data to a particular distribution (e.g., normal, log normal) can <br />be demonstrated by plotting the data points as a graph. Aligned or clustered data points <br />indicate that the distribution is valid. Data not included along the alignment or in the cluster <br />1 may be considered "outliers". <br />The planar orientations (dip direction, dip) for the total sample are shown on <br />Figure 11. Several clusters are evident: Sets 1, 2, 4, 5 and 7, and the weak set at 66/86; <br />• these numbers correspond to joints sets given in Tables 2 and 3. Other concentrations of <br />joints are not evident within the total sample; concentrations within design zones are <br />probably valid within each zone. The interpretation of these data is that a stability analysis <br />based on the total sample could be misleading and that a zone by zone analysis, as done for <br />l this report, is probably a more reasonable approach. These data are considered to be valid <br />I orientations. The scatter of outliers is interpreted as randomly oriented fractures in the <br />sandstone. <br />4.3 Analysis of Fabric Data <br />1 The rock fabric data (i.e. dip direction and dips) of planes was organized in <br />1 different ways so that we could determine joint sets and compare them for each hazard zone. <br />Scatter diagrams and Schmidt equal area plots were developed for Hazard Zone 2, Hazard <br />t Zones 1 through 4, Hazard Zone 5, Hazard Zone 6, and a combined plot for all zones. <br />J These are shown in Figures 6 through 10. <br />16 <br />