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Design Report for Alteration of Monument Dam <br />Table of Contents <br />1 Introduction ...........................................................................................................................................1 <br />2 Background ......................................................................................................................................... ..2 <br />3 Hazard Classification and Dam Size ................................................................................................... ..4 <br />4 Project Components ............................................................................................................................. ..5 <br /> 4.1 Dam ........................................................................................................................................... ..5 <br /> 4.2 Landslide ................................................................................................................................... ..6 <br />5 Hydrology and Hydraulics .................................................................................................................. ..7 <br /> 5.1 Intake Structure Design ............................................................................................................. ..7 <br /> 5.1.1 Intake Structure ............................................................................................................ ..7 <br /> 5.1.2 Cast Iron Slide Gate ..................................................................................................... .. 8 <br /> 5.1.3 Operator's Platform ...................................................................................................... ..8 <br /> 5.2 Outlet Works Analysis and Design .......................................................:................................... ..8 <br />6 <br />........................................................... <br />Geology .......:.......................................................... .................. 11 <br />7 Seismic Hazard .................................................................................................................................... 12 <br /> 7.1 Natural Seismicity ..................................................................................................................... 12 <br /> 7.1.1 Historic Earthquakes .................................................................................................... 13 <br /> 7.1.2 Ground Motions ........................................................................................................... 13 <br /> 7.2 Mine-Induced Seismicity .......................................................................................................... 14 <br /> 7.2.1 Historic Mine-Induced Earthquakes ............................................................................. 14 <br /> 7.2.2 Anticipated Seismicity Associated with E Seam Mining ............................................. 16 <br /> 7.2.3 Ground Motions for Mine-Induced Seismicity ............................................................ 16 <br />8 Dam Analysis and Design ...................................................................................................................18 <br />8.1 Seepage Analysis .......................................................................................................................18 <br />8.1.1 Geometry ......................................................................................................................18 <br />8.1.2 Parameters ....................................................................................................................19 <br />8.1.3 Modeling ............................................................................:.........................................20 <br />8.1.3.1 Mesh, Boundary Conditions, and Type of Analysis .....................................21 <br />8.1.3.2 Calibration Using Field Performance (Existing Conditions) . .......................22 <br />8.1.4 Summary of Seepage Results .......................................................................................23 <br />8.2 Slope Stability Analysis ............................................................................................................24 <br />8.2.1 Geometry ......................................................................................................................25 <br />8.2.2 Parameters ....................................................................................................................25 <br />8.2.2.1 Unit Weight ........................................................................................:.........25 <br />8.2.2.2 Embankment Material .......................................................... ........................26 <br />8.2.2.3 Soft Sediment ....................................................................... ........................26 <br />8.2.2.4 Colluvium ............................................................................. ........................27 <br />8.2.2.5 Failure Surface Material ....................................................... ........................28 <br />8.2.2.6 Buttress ................................................................................. ........................29 <br />8.2.2.7 Downstream Drainage Blanket ...........................•................. ........................29 <br />P:\Mpis\06 CO\26\0626067\WorkFiles\DesignReport\FINAL\DesignReportFINAL.doc 1 <br />