2013-07-02_REPORT - C1980007 ‎(3)‎

• Permit No: C1980007
• IBM Index Class Name: REPORT
• Doc Date: 7/2/2013
• Doc Name: 2012 Annual Hydrology Report
• From: Hydro Geo, Inc
• To: DRMS
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JRS
• Email Name: DIH
• Media Type: D
• Archive: No

West Elk Mine 2012 Annual Hydrology Report i
MOUNTAIN COAL COMPANY, LLC
WEST ELK MINE
WATER YEAR 2012 (WY 2012) ANNUAL HYDROLOGY REPORT
TABLE OF CONTENTS
1.0 INTRODUCTION
1.1 Overview of Mining Operations
2.0 HYDROLOGIC SUMMARY OF WATER YEAR 2012 ......... ..............................2
2.1 Climatological Data ....................................................... ..............................2
2.2 Stream Flow Data .......................................................... ..............................6
2.2.1 Flows in the North Fork of the Gunnison River ..............................6
2.2.2 Flows in Minnesota Creek near Paonia, CO ...... ..............................7
3.0 HYDROLOGIC MONITORING PLAN ................................... ..............................9
3.1 Surface Water Monitoring Program .............................. .............................12
3.1.1 Upper North Fork Drainage Basin Surface Water Monitoring
Stations.............................................................. .............................14
3.1.1.1 Deep Creek (Upper, Lower) ........... .............................14
3.1.1.2 Raven Gulch (Upper, Lower) ......... .............................14
3.1.1.3 Box Canyon .................................... .............................14
3.1.1.4 North Fork Upper ............................ .............................14
3.1.1.5 Sylvester Gulch (Upper, Middle, Lower) ....................15
3.1.2 Lower North Fork Drainage Basin Surface Water Monitoring
Stations.............................................................. .............................15
3.1.2.1 North Fork Lower ........................... .............................15
3.1.2.2 Lower Gribble Gulch ...................... .............................15
3.1.3 Minnesota Creek Drainage Basin Surface Water Monitoring
Stations.............................................................. .............................15
3.1.3.1 Lick Creek Flume ........................... .............................15
3.1.3.2 Dry Fork Flumes ............................. .............................16
3.1.3.2.1 Upper, Middle, and Lower Dry Fork Flumes.. 16
3.1.3.2.2 Minnesota Reservoir Flume .............................16
3.1.3.3 Deep Creek Ditch Flume ................ .............................16
3.1.3.4 Poison Gulch ................................... .............................17
3.1.3.5 Deer Creek ...................................... .............................17
3.1.3.6 Horse Gulch and East Gulch, East of Horse Gulch .....17
3.1.3.7 Minnesota Creek (Upper, Lower) ... .............................17
3.1.3.8 South Prong Creek .......................... .............................18
June 20 13 HydroGeo, Inc.