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<br />' <br /> IV. GEOTECHNICAL DATA COLLECTION SUMMARY <br /> <br /> 4.01 General <br /> During 2005, continued water storage occurred in the Central Quany. Slope conditions were <br /> inspected, however conditions did not change that would require reevaluation of stability of the <br /> rock slopes. <br /> <br /> Geologic mapping was performed for the northern side of Benches B and C in the North Quarry <br /> and for the westem side of Benches B, and C. The strike and dip of structural features were <br /> measured with a Brunton compass (using a 9.5 degree east magnetic declination) and recorded <br /> using the quadrant method (bearing of strike direction in relation to north). <br />~~~ <br /> <br /> <br /> <br /> <br /> <br />LI <br /> <br /> <br /> <br /> <br /> <br /> <br />4.02 Central Quarry <br />No new geologic mapping data was collected for the Central Quarry since there was no mining <br />activity in 2004. General observations were made in the final mined area. <br />Aggregate Industries has provided survey support of the stabilized slope movement in the east <br />side since 1996. Survey support consists of continued monitoring of the post-repair surface <br />settlement points via optical survey. Survey data from March 1997, May 1997, March 1998, <br />October 1998, August 1999, August 2000, Apri12002, and Febmary 2004 document the <br />performance of the repair. Based on this monitoring and the fact that mining is completed in <br />this area, continued monitoring will be performed once every 3 years or as conditions are <br />observed to change. <br />4.03 North Quarry <br />New geologic mapping data was collected for $enches B and C at the lower north area of the <br />North Quarry and for Benches B and C at the westem central and lower areas of the North <br />Quarry. Joint orientation data was measured at areas of stmctural interest for apparent final <br />highwall segments established during 2005. Other mapping data and observations such as <br />fault/shear zone locations as well as notes about rock type and condition were documented. <br />Figure 2 illustrates where the measurements were made and approximate stationing along the <br />benches. This figure also highlights a shear zone and a prominent joint observed during the <br />explorations. The data are presented in Appendix A. <br />