2008-05-29_REVISION - M1977285

• Permit No: M1977285
• IBM Index Class Name: REVISION
• Doc Date: 5/29/2008
• Doc Name: Drainage report for Sunday Mines Group
• From: Denison Mines
• To: DRMS
• Type & Sequence: AD1
• Email Name: RCO
• Media Type: D
• Archive: No

Contents
Section 1 Introduction
1.1 Location .............................
1.2 Procedure and Approach
Section 2 Topaz Mine
1-1
..........
1-1
..........
2.1 Existing Drainage Conditions .............................................................. 2-1
2.2 Tetra Tech Drainage Plan ...................................................................... 2-1
2.3 Peak Discharge Comparison ................................................................ 2-1
2.4 . Surface Water Control Structure Design ............................................ 2-2
2.4.1 Channel Design ....................................................................... 2-2
2.4.2 Berm Design ............................................................................ 2-4
2.5 Conclusions and Recommendations ................................................... 2-5
Section 3 West Sunday Mine
3.1 Existing Drainage Conditions .............................................................. 3-1
3.2 Drainage Plan ......................................................................................... 3-1
3.3 Peak Discharge Estimate ....................................................................... 3-1
3.4 Surface Water Control Structure Design ............................................ 3-2
3.4.1 Channel Design ....................................................................... 3-2
3.4.2 Berm Design ............................................................................ 3-3
3.5 Conclusions and Recommendations ................................................... 3-4
Section 4 St. Jude Mine
4.1 Existing Drainage Conditions .............................................................. 4-1
4.2 Drainage Plan ......................................................................................... 4-1
4.3 Peak Discharge Estimate ....................................................................... 4-1
4.4 Surface Water Control Structure Design ............................................ 4-2
4.4.1 Channel Design ....................................................................... 4-2
4.4.2 Berm Design ............................................................................ 4-3
4.5 Conclusions and Recommendations ................................................... 4-4
Section 5 Carnation Mine
5.1 Existing Drainage Conditions .............................................................. 5-1
5.2 Drainage Plan ......................................................................................... 5-1
5.3 Peak Discharge Estimate ....................................................................... 5-1
5.4 Surface Water Control Structure Design ............................................ 5-2
5.4.1 Channel Design ....................................................................... 5-2
5.4.2 Berm Design ............................................................................. 5-3
5.5 Conclusions and Recommendations ................................................... 5-4

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O:\84988 - Denison\Task Order 1 - Sunday Mines Drainage Study\Report\Flnal Reporffinal Sunday Mines Drainage Report_052208.doc