June 2022 G-01483.84-017-R-Rev0 iii 6.11 WRS Staging and Construction Methodology ...............................................................................27 6.11.1 Construction Methodology ........................................................................................................27 6.11.2 Materials Movement Schedule .................................................................................................27 7.0 WATER MANAGEMENT ..........................................................................................................................29 7.1 Approach Overview........................................................................................................................29 7.2 Ponds .............................................................................................................................................30 7.3 Willows Collection Pond.................................................................................................................31 7.3.1 Excavation and Cut Slopes.......................................................................................................32 7.3.2 Embankment Design.................................................................................................................32 7.3.3 Lining.........................................................................................................................................35 7.3.4 Spillway and Freeboard ............................................................................................................35 7.3.5 Earthquake Performance ..........................................................................................................35 7.4 WRS Toe Seepage Pond...............................................................................................................36 7.4.1 Seepage Collection...................................................................................................................36 7.5 Surface Drainage ...........................................................................................................................36 7.5.1 Catchment Data ........................................................................................................................36 7.5.2 SCS Rainfall Runoff Method .....................................................................................................36 7.5.3 Culvert Sizing............................................................................................................................42 7.5.4 Channel Lining and Geometry ..................................................................................................43 7.5.5 Energy Dissipation ....................................................................................................................46 7.6 Site Surface Infrastructure .............................................................................................................46 7.6.1 Surface Elements Overview .....................................................................................................46 7.6.2 Mine Industrial Area ..................................................................................................................46 7.6.3 Magazine ..................................................................................................................................49 8.0 WRS ALTERNATIVES AND FUNCTIONAL NEED ASSESSMENT .......................................................50 9.0 WRS CLOSURE PLAN.............................................................................................................................51 10.0 CONCLUSION...........................................................................................................................................51 11.0 RECOMMENDATIONS .............................................................................................................................52 12.0 REFERENCES ..........................................................................................................................................53
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