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West Elk Mine 2001 Annual Hydrology Report • WEST ELK MINE 2001 ANNUAL HYDROLOGY REPORT MOUNTAIN COAL COMPANY, LLC 1.0 INTRODUCTION The 2001 Annual Hydrology Report (AHR) details Mountain Coal Company's (MCC) hydrologic monitoring activifies at the West Elk Mine (Project) for the Water Year 2001 (WY2001). The report summarizes the monitoring information and presents an analysis of the data with respect to mining operations as required by MCC's Permit C-80-007 with the Colorado Division of Minerals and Geology (CDMG). 1.1 Overview of Mining Operations In WY2001, mining was completed in longwall panel 13 and mining was advanced up to crosscut 16 in longwall panel 14. Development mining continued in longwall panels 14, 15, and 16. 2.0 HYDROLOGIC SUMMARY OF 2001 WATER YEAR During WY2001 precipitation and snowfall were below average, resulting in reduced streamflows in the North Fork of the Gunnison River and Minnesota Creek 2.1 Climatological Data Precipitation and snow data for the project azea for WY2001 were derived from the Paonia 1 SW (56306), Overland Reservoir (59853), and McClure Pass (59743) meteorological and Snotel stations. Figure 1 shows WY2001 monthly average data compazed to 30-yeaz historical averages. The monthly average precipitation for WY2001 compazed to the 30-year average ranged from 26 percent of average in September 2001 to 193 percent of average in August 2001. Overall WY2001 precipitation was 75 percent of the 30-year average. The accumulated snow water equivalent, a standard measure of snow pack, was collected from Snotel data at Overland Reservoir and McClure Pass. The Overland Reservoir data showed that the accumulated snow water equivalent from October 2000 through Februazy 2001 was 62 percent of the 30-year historical average. The McClure Pass WY2001 snow data showed a similar trend, r 1 U l~oi~caoosot HydroGeo, Inc.