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IV. GEOTECHNICAL DATA COLLECTION SUMMARY <br />4.01 General <br />During 2002, detailed geotechnical data collection was necessary for two highwalls in the <br />North Quarry excavated at slope angle steeper than default slope angle of 1H:1V as required <br />by the Amendments. Data from highwalls was collected and used to reevaluate the steeper <br />slope. <br />During 2002, filling of the reservoir occurred in the Central Quarry. Slope conditions were <br />inspected, however conditions did not change that would require reevaluation of stability of <br />the cut slopes. <br />Geologic mapping of new fmal highwalls was performed in the North Quarry. The strike and <br />dip of structural features was measured with a Brunton compass (using a 14~E magnetic <br />declination) and recorded using "right hand rule" convention (bearing of strike direction with <br />dip direction being 90~ to the right). In addition, the optical survey. of surface survey monitor <br />points in and around the repaired faiNre area in the east side of the Central Quarry continued <br />in 2002. <br />4.02 Central Quarry <br />No new geologic mapping data was collected for the Central Quarry since there was no <br />mining activity in 2002. 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 continued during 2002 in the form of continued monitoring <br />of the post-repair surface settlement points via optical survey. Survey data from March 1997, <br />May 1997, March 1998, October 1998, August 1999, August 2000, and April 2002 document <br />the performance of the repair. A discussion of these data is provided in Section 5.02, and the <br />data are included as Appendix A. <br />4.03 North Quarry <br />New geologic mapping data was collected for Bench 3 and 2 at the north side of the North <br />Quarry. Joint orientation data was measured at approximately 100 fr intervals and/or areas of <br />structural interest for final highwall segments established during 2002. Other mapping data <br />and observations such as fault/shear zone locations, fold axis trends, and intrusive dike <br />locations, as well as notes about rock type and condition, were documented. This <br />information is shown on Figure 1. <br />G:\PROJ ECTS\20200 Morrison Quarry\008\2002\2002 geotechnical addendum.doc <br />