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2005 ANNUAL HYDROLOGY REPORT <br />1.0 INTRODUCTION <br />The Following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the BTU Empire <br />Corporation (BTU EC) underground mine sites near Craig, Colorado for the 2005 calendar year. Site <br />locations are described below. This AHR is provided in fulfillment of reporting requirements under the <br />Colorado State Division of Minerals and Geology (DMG) Permit No. C-81-044. All references to "2005" in <br />this report refer to the 2005 calendar year (January 1, 2005 through December 31, 2005). <br />In June 2001, Technical Revision TROI-32 was approved, allowing suspension of many DMG hydrologic <br />monitoring requirements while the mine is in temporary cessation (TC). Thus, this AHR addresses only the <br />monitoring requirements under TC. Monitoring results for prior calendar years (1983 through 2004) are <br />presented in previous AHRs, although selected historical data (period of record - POR) are surrunarized in <br />some of the tables and figures within this AHR. Following a discussion of Site Location and Background, <br />this AHR provides a section on the 2005 Hydrologic Monitoring Program, which is further divided into the <br />• following subsections: <br />1) Groundwater Monitoring <br />2) Surface Water Monitoring <br />This is followed by the Summary and Conclusions Section. Tables, Figures, and back-up documentation are <br />located in the tabbed sections at the back of this AHR. <br />2.0 SITE LOCATION AND BACKGROUND <br />BTU EC's Eagle No. 5 and Eagle No. 6 Mines are underground coal mines located approximately seven <br />miles south of Craig, Colorado, on State Highway 13. The mine sites, and adjacent area lie along the <br />northem foot of the Williams Fork Mountains, which trend east [o west. The elevation of the permit area <br />ranges from a low of approximately 6,130 feet in the Big Bottom area, to a high of about 7,400 feet in the <br />Williams Fork Mountains. The entire operation is located in Moffat County, Colorado. The general location <br />of the site is shown on Figure 1. <br />There are two (2) major northwestern Colorado Rivers, which intersect the permit area. These are: 1) the <br />Yampa River and 2) the Williams Fork River. The Yampa River runs from north to south through the pemvt <br />area, while the Williams Fork River runs from south to north and intersects the Yampa River just north of the <br />• mine facilities area. The northern portion of the permit area is dominated by the Big Bottom alluvium, while <br />1 <br />I:\Env\Empire\AHR\2005\Text\Empi re2005AH R.doc <br />