REV94505

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 5/24/1999
• Doc Name: DRAFT WEST PIT EVAPORATION POND SYSTEM DESIGN SAN LUIS PROJECT COSTILLA CNTY CO
• Type & Sequence: TR26
• Media Type: D
• Archive: No

TABLE OF CONTENTS
• 1.0 INTRODUCTION ..........................................................................................................1-1
2.0 SITE DESCRIPTION ....................................................................................................2-1
2.1 West Pit Post-Mining Hydrogeology ................................................................... 2-1
3.0 FACILITIES LAYOUT AND DESIGN ......................................................................3-1
3.1 Water Balance - Operations ..................................................... ............................ 3-1
3.2 Holding Pond and Spray Area ................................................. ............................ 3-2
3.3 Evaporative Spray Stations ...................................................... ............................ 3-2
3.4 Pumping Operations ................................................................. ............................ 3-3
3.5 Diversion Channel Design ....................................................... ............................ 3-4
3.5.1 General ......................................................................... ............................3-4
3.5.2 Watershed Hydrology .................................................. ............................ 3-4
3.5.3 Method of Analyses ..................................................... ............................ 3-5
3.5.3.1 HEC-1 Model ............................................. ............................3-5
3.5.3.2 Diversion Channel and Riprap Sizing ........ ............................ 3-6
3.5.4 Results of Analyses ...................................................... ............................ 3-7
4.0 CONSTRUCTION SEQUENCE .................................................................................. 4-1
4.1 Phase 1 ................................................................................................................. 4-1
4.2 Phase 2 ................................................................................................................. 4-1
•
4.3 Phase 3 ................................................................................................................. 4-1
5.0 OPERATIONS AND MAINTENANCE ...................................................................... 5-1
5.1 Monitoring ........................................................................................................... 5-1
5.2 Costs ..................................................................................................................... 5-2
6.0 CLOSURE AND RECLAMATION ............................................................................. 6-1
7.0 SUMMARY ....................................................................................................................7-1
8.0 REFERENCES ...............................................................................................................8-1
LIST OF TABLES
Table 3-1 Summary of Basin Chazacteristics
Table 3-2 Basin Flow Contributions
Table 3-3 Diversion Channel Dimensions
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