REP50217

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 8/25/2005
• Doc Name: 2004 Annual Hydrology Report
• From: HydroGeo Inc
• To: DMG
• Annual Report Year: 2004
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

West Elk Mine 2004 Annual Hydrology Report i
MOUNTAIN COAL COMPANY, LLC
WEST ELK MINE
WATER YEAR 2004 (WY 2004) ANNUAL HYDROLOGY REPORT
TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................................... 1
1.1 Overview of Mining Operations ........................................................................ ................ 1
2.0 HYDROLOGIC SUMMARY OF WY 2004 ........................................................................ ................ 1
2.1 Climatological Data .......................................................................................... ................ 1
2.2 Stream Flow Data .............................................................................................. ............... 4
3.0 HYDROLOGIC MONITORING .......................................................................................... ............... 6
3.1 Surface Water Monitoring ................................................................................. ............... 7
3.1.1 Upper North Fork Drainage Basin Surface Water Monitoring Stations .. ............... 9
3.1.1.1 Deep Creek ............................................................................... ............... 9
3.1.1.2 Box Canyon .............................................................................. ............... 9
• 3.1.1.3 North Fork Upper .....................................................................
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3.1.2 Lower North Fork Drainage Basin Surface Water Monitoring Stations .. ..............10
3.1.2.1 North Fork Lower ..................................................................... ..............10
3.1.2.2 Lower Gribble Gu-ch ................................................................ ..............10
3.1.3 Minnesota Creek Drainage Basin Surface Water Monitoring Stations .... ..............10
3.1.3.1 Lick Creek Flume ..................................................................... ..............10
3.1.3.2 Dry Fork ................................................................................... ..............10
3.1.3.3 Horse Gulch and East Gulch, East of Horse Gulch .................... ..............10
3.1.3.4 Upper and Lower Minnesota Creek ........................................... ..............I1
3.2 Spring and Seep Monitoring .............................................................................. ..............11
3.2.1 Springs above the F Seam in the North Fork Drainage Basin ................. ..............13
3.2.1.1 Spring 24-3 ............................................................................... ..............13
3.2.1.2 Spring 26-1 ............................................................................... ..............13
3.2.1.3 Seep E14-1 ............................................................................... ..............13
3.2.1.4 Spring 27-1 ............................................................................... ..............13
3.2.1.5 Spring G-7 ................................................................................ ..............14
. 3.2.1.6 Spring G-16 .............................................................................. ..............14
August 2005 HydroGeo, Inc.