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2003 ANNUAL HYDROLOGY REPORT <br />7.0 INTRODUCTION <br />The following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the RAG Empire <br />Corporation (RAG EC) underground mine sites neaz Craig, Colorado for the 2003 calendaz yeaz, Site <br />locations aze described below. This AHR is provided in fulfilhnent of reporting requirements under the <br />Colorado State Division of Minerals and Geology (DMG} Pemut No. C-81-044. All references to "2003" in <br />this report refer to the 2003 calendaz year (January 1, 2003 through December 31, 2003). <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 2002) 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 [his AHR. Following a discussion of Site Locafion and Background, <br />this AHR provides a section on the RAG EC 2003 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 ai <br />the back of this AHR. <br />2.0 SITE LOCATION AND BACKGROUND <br />RAG 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 azea lie along the <br />northern foot of the Williams Fork Mountains, which trend east to west. The elevation of the pemut 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 aze two (2) major northwestern Colorado Rivers, which intersect the permit area. These aze: 1) the <br />Yampa River and 2) the Williams Fork River. The Yampa River runs from north to south through the permit <br />• azea, while the Williams Fork River runs from south to north and intersects the Yampa River just north of the <br />mine facilities azea. The northern portion of the pemtit azea is dominated by the Big Bottom alluvium, while <br />1 <br />I:1Env\EmpireV+HR120031Text\Empire2003AHR.doc <br />