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•. <br />West Elk Mine 2007 Annual Hydrology Report <br />i <br />MOUNTAIN COAL COMPANY, LLC <br />WEST ELK MINE <br />WATER YEAR 2007 (WY 2007) ANNUAL HYDROLOGY REPORT <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION ..................................................................................................................... 1 <br />1.1 Overview of Mining Operations ............................................................................ 1 <br />2.0 HYDROLOGIC SUMMARY OF WATER YEAR 2007 ......................................................... 1 <br />2.1 Climatological Data ............................................................................................... 1 <br />2.2 Stream Flow Data .................................................................................................. 3 <br />?J <br />• <br />3.0 HYDROLOGIC MONITORING PLAN .................................................................................. 6 <br />3.1 Surface Water Monitoring ..................................................................................... 9 <br />3.1.1 Upper North Fork Drainage Basin Surface Water Monitoring Stations. 11 <br /> 3.1.1.1 Deep Creek (Upper, Lower) ...................................................... 11 <br /> 3.1.1.2 Raven Gulch (Upper, Lower) .................................................... 11 <br /> 3.1.1.3 Box Canyon ............................................................................... 11 <br /> 3.1.1.4 North Fork Upper ...................................................................... 12 <br /> 3.1.1.5 Sylvester Gulch (Upper, Middle, Lower) .................................. 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.. 13 <br /> 3.1.3.1 Lick Creek Flume ...................................................................... 13 <br /> 3.1.3.2 Dry Fork Flumes (Upper, Middle, and Lower) ......................... 13 <br /> 3.1.3.3 Poison Gulch ............................................................................. 13 <br /> 3.1.3.4 Deer Creek ................................................................................. 14 <br /> 3.1.3.5 Horse Gulch and East Gulch, East of Horse Gulch ................... 14 <br /> 3.1.3.6 Minnesota Creek (Upper, Lower) .............................................. 14 <br />3.1.4 New Stream Monitoring Sites Established in WY 2005 & WY 2006.... 15 <br /> 3.1.4.1 Deep Creek Ditch Flume ........................................................... 15 <br /> 3.1.4.2 Minnesota Reservoir Flume ....................................................... 15 <br /> 3.1.4.3 South Prong Creek ..................................................................... 15 <br />June 2008 HydroGeo, Inc.