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