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West Elk Mine 2002 Annual Hydrology Report <br />• WEST ELK MINE <br />2002 ANNUAL HYDROLOGY REPORT <br />MOUNTAIN COAL COMPANY, LLC <br />1.0 INTRODUCTION <br />The 2002 Annual Hydrology Report (AHR) details Mountain Coal Company's (MCC) hydrologic <br />monitoring activities at the West Elk Mine (Project) for the Water Year 2002 (WY2002). The <br />report summarizes the monitoring information and presents an analysis of the data with respect to <br />mining operations as required by MCC's Permit C-80-007 with the Colorado Division of Minerals <br />and Geology (CDMG). <br />1.1 Overview of Mining Operations <br />In WY2002, mining was completed in longwall panels 14 and 15 and mining was advanced up to <br />crosscut 36 in longwall panel 16. Development mining continued in longwall panels 17 and 22 <br />• (see Map 1). <br />2.0 HYDROLOGIC SUMMARY OF 2002 WATER YEAR <br />During the Water Year 2002, October 2001 through September 2002 (WY2002), precipitation and <br />snowfall were below average, resulting in reduced stream flows in Western Colorado. <br />2.1 Climatological Data <br />Precipitation and snow data for the project area for WY2002 were derived from the Paonia 1 SW <br />(56306), Overland Reservoir (59853), and McClure Pass (59743) meteorological and Snotel <br />stations (Colorado Climate Center, 2003 and NRCS, 2003). Figures la,b, and c show WY2002 <br />monthly average precipitation data compared to 30-year historical averages for Paonia, Overland <br />Reservoir and McClure Pass. The annual precipitation was 64%, 66% and 74% of the 30-year <br />historical averages for Paonia, Overland Reservoir and McClure Pass, respectively. <br />I~ <br />Project #00301 HydroGeo, Inc. <br />