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West Elk Mine 2006 Annual Hydrology Report 1 <br />• MOUNTAIN COAL COMPANY, LLC <br />WEST ELK MINE <br />WATER YEAR 2006 (WY 2006) ANNUAL HYDROLOGY REPORT <br />TABLE OF CONTENTS <br />1.0 1NTRODUCTION .................................................................................................................................... 1 <br />1.1 Overview of Mining Operations ........................................................................................... 1 <br />2.0 HYDROLOGIC SUMMARY OF 2006 WATER YEAR :....................................................................... 1 <br />2.1 Climatological Data .............................................................................................................. 1 <br />2.2 Stream Flow Data .................................................................................................................. 5 <br /> 3.0 HYDROLOGIC MONITORING PLAN .................................................................................................. 6 <br />• 3.1 Surface Water Monitoring .................................................................................................... . 8 <br /> 3.1.1 Upper North Fork Drainage Basin Surface Water Monitoring Stations ................ 11 <br /> 3.1.1.1 Deep Creek ................................................................................................ 11 <br /> 3.1.1.2 Raven Gulch .............................................................................................. 11 <br /> 3.1.1.3 Box Canyon ............................................................................................... 11 <br /> 3.1.1.4 North Fork Upper ...................................................................................... 11 <br /> 3.1.1.5 Sylvester Gulch ......................................................................................... 12 <br /> 3.1.2 Lower North Fork Drainage Basin Surface Water Monitoring Stations ............... 12 <br /> 3.1.2.1 North Fork Lower ..................................................................................... 12 <br /> ' 3.1.2.2 Lower Gribble Gulch ................................................................................ 12 <br /> 3.1.3 Minnesota Creek Drainage Basin Surface Water Monitoring Stations .................. 12 <br /> 3.1.3.1 Lick Creek Flume ...................................................................................... 12 <br /> 3.1.3.2 Dry Fork .................................................................................................... 13 <br /> 3.1.3.3 Poison Gulch ............................................................................................. 13 <br /> 3.1.3.4 Deer Creek ................................................................................................ 13 <br /> 3.1.3.5 Horse Gulch and East Gulch, East of Horse Gulch ................................... 13 <br />• 3.1.3.6 Upper and Lower Minnesota Creek .......................................................... 14 <br /> 3.1.4 New Stream Monitoring Sites Established in WY 2005 & WY 2006 ................... 14 <br /> <br /> December 2007 HydroGeo, Inc. <br />