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III IIIIIIIIIIIII III <br />999 _ <br />_ Doc Date:12111l2001 <br />• SIL" TABLE OF CONTENTS <br />Paae No. <br />LIST OF TABLES iii <br />LIST OF FIGURES iv <br />LIST OF APPENDICES iv <br />INTRODUCTION 1 <br />METHODOLOGY AND ASSUMPTIONS 4 <br />THYD1 Computer Model (Structures Maintaining Original <br />Design) . 4 <br />SEDCAD+ Computer Model (Structures Revised in 1989) 4 <br />MINE AREA PONDS 11 <br />General Description 11 <br />Sedimentation Pond No. 1 12 <br />Water Treatment and Recycle Pond No. 2 20 <br />• Freshwater Pond No. 3 22 <br />Sedimentation Pond No. 4 24 <br />Sedimentation Pond No. 5 74 <br />MINE AREA DIVERSIONS AND DITCHES 93 <br />Sediment Collection Ditches 93 <br />Permanent Diversion No. 1 and Refuse Collection Ditches 105 <br />Magpie Creek Diversion 138 <br />South Mine Fan Light Use Road Ditch 155Ra <br />MINE AREA CULVERTS 156 <br />Haul Road Culvert at Refuse Pile 156 <br />Pond No. 1 Inlet Culvert 158 <br />Pond No. 5 Inlet Culverts 159 <br />Yard Area Catch Basin Culvert 160 <br />South Mine Fan Light Use Road Culvert 16bRa <br />South Mine Fan Light Use Road Crossing 166Ra <br />LOADOUT AREA PONDS AND DRAINAGE STRUCTURES 168 <br />East Loadout Area 168 <br />West Loadout Area 177 <br />iR <br />Revised - June 1992 <br />.,..,,.o.,m <br />m~ ~~. <br />