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2.0 Data Collection <br />Data collection for this 2002 evaluation included measurements of strike and dip <br />of geologic discontinuities in the exposed rock faces of the quarry. <br />Measurements were taken from final bench walls where possible and from faces <br />of advancing benches. Figure 1 indicates the location of visible rock exposures <br />at the time (March 20 and 22, 2002) the discontinuity measurements were <br />obtained. To minimize the impact of data collection on mining activity, the <br />measurements were taken in areas safely removed from production activities. <br />The actual dates of data collection included March 20 and 22, 2002. <br />Measurements were obtained utilizing a Brunton compass both indirectly away <br />from the discontinuity by sighting along the discontinuity surface and, where <br />deemed safe, by direct measurement on the discontinuity surface. <br />A total of 83 discontinuity measurements were collected and added to the <br />previous collection of measurements for a database total of 500 observations of <br />strike and dip in the quarry. Figure 2 is a stereographic plot of poles <br />representing structural features. The diamond symbols represent the new data <br />collected for this report, while the three-pointed stars represent the 2001 data, <br />the squares represent the 1999 data, and the circles represent the 1997 and <br />1998 data collected for the previous reports. By identifying the data with the <br />year it was obtained, any major deviations or trends in discontinuity orientations <br />can be monitored as mining continues and the pit is expanded. <br />In addition to the discontinuity measurements identified above, 13 direct <br />measurements of the dip angles of exposed foliation joint surfaces were <br />collected from the west wall and south bench face of the main pit. The <br />measurements were obtained by a hand clinometer held flush to the discontinuity <br />surface. These direct dip angles are presented in Appendix B. <br />' 2002 Spec-Agg Annual Report Page 5 <br />