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Table 2 Calculated Accelerations for Selected Mine-Related Earthquakes <br />Year Magnitude Distance (km) Depth (km) Media pga (g) <br />1994 3.10 5 1 0.065 <br />1994 2.80 3 1 0.075 <br />1995 3.00 2 1 0.10 <br />1995 2.90 1 1 0.12 <br />2001 3.40 8 1 0.05 <br />2003 3.40 3 1 0.11 <br />Expected E Seam 2.30 2.73 0.30 0.06 <br />Events 2.00 1.06 0.20 0.077 <br />Note: Earthquake events are from NEIC Catalog except where noted as maximum expected E Seam <br />event. <br />In summary, the natural seismicity at Monument Dam is expected to generate more severe ground <br />motions (i.e., a = O.15g) than the mine-induced seismicity (i.e., a = 0.077g). Therefore, the design <br />ground motion for the proposed modifications is O.15g. <br />P:\Mpls\06 CO\26\0626067\WorkFiles\DesigtReport\FINAL\DesignReportFINAL.doc 17 <br />