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2004 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 2004 calendar year. Site <br />locations are described below. This AHR is provided in fulfillment of reporting requirements under the <br />Colorado Slate Division of Minerals and Geology (DMG) Permit No. C-81-044. All references to "2004" in <br />[his report refer to the 2004 calendar year (January 1, 2004 through December 31, 2004). <br />In June 2001, Technical Revision TROT-32 was approved, allowing cessation 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 2003) are <br />presented in previous AHRs, although selected historical data (period of record - POR) are summarized 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 BTU EC 2004 Hydrologic Monitoring Program, which is further divided <br />into the following subsections: <br />1) Groundwater Monitoring <br />2) Surface Water Monitoring <br />Next follows the Summary and Conclusions Section. Tables and Figures are located in the tabbed sections at <br />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 ffighway 13. The mine sites, and adjacent area lie along the <br />northern foot of the Williams Fork Mountains, which [rend east to 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 Colomdo Rivers, which intersect [he permit area. These are: 1) the <br />Yampa River and 2) the Williams Fork River. The Yampa River runs from north to south through [he pemvi <br />area, while the Williams Fork ffiver 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 />I:\Env\Em pi reW H R\2004\TeM\Em pire2004AH R.doc <br />1 <br />