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• GCC RIO GRANDE -RED ROCK PLANT AND MINE <br />SURFACE WATER MANAGEMENT PLAN <br />Table of Contents <br />INTRODUCTION ..........................................................................................................................1 <br />Purpose and Scope ...............................................................................................................1 <br />Site Location and Description .............................................................................................2 <br />Reference Documents and Standards ..................................................................................2 <br />HYDROLOGIC ANALYSIS ........................................................................................................3 <br />SEDCAD Model ....................................................................................................:..............3 <br />Watershed Delineation .............................................................................................3 <br />Design Storm Precipitation ......................................................................................4 <br />Soil Parameters ........................................................................................................4 <br />Hydrologic and Sedimentology Results ...............................................................................5 <br />Existing Conditions ..................................................................................................5 <br />Critical Mining Period Analysis ..............................................................................5 <br />• Post Reclamation Analysis .......................................................................................6 <br />STORM DRAINAGE PLAN ........................................................................................................6 <br />Ancillary Mining Activities ..................................................................................................6 <br />Protect Transportation Facilities ............................................................................6 <br />Protect the Plant from Storm Water Runoff .............................................................7 <br />Control Runofj°from Disturbed Areas ......................................................................8 <br />Manage Process Water Without Surface Water Discharge .....................................8 <br />Manage Domestic Wastewater ................................................................................8 <br />Mining Activities ...........-~ .....................................................................................................8 <br />Control Storm Water within Active Mining Area ....................................................8 <br />Control Stormwater Discharges from Active Mine Area .........................................9 <br />Post Reclamation .................................................................................. ...............................9 <br />Restore Existing Arroyo Alignmeni .......................................... .............................10 <br />Restore Existing Arroyo Cross Section ..................................... .............................10 <br />Restore Arroyo Watershed Boundaries .................................... .............................10 <br />Provide Additional Protection Measures .................................. .............................10 <br />Preserve and Restore Existing Stock Ponds ............................. .............................11 <br />BIBLIOGRAPHY ........................................................................................................................12 <br />• <br />