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2002 ANNUAL HYDROLOGY REPORT <br />1.0 INTRODUCTION <br />The following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the RAG Empire <br />Corporation (RAG EC) underground mine sites near Craig, Colorado for the 2002 calendar yeaz. 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 "2002" in <br />this report refer to the 2002 calendaz yeaz (January 1, 2002 through December 31, 2002). <br />In June 2001, Technical Revision TROI-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 calendaz yeazs (1983 through 2001) 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 RAG EC 2002 Hydrologic Monitoring Program, which is further divided <br />into the following subsections: <br />• <br />1) Groundwater Monitoring <br />2) Surface Water Monitoring <br />Next follows the Smnmary 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 />RAG EC's Eagle No. 5 and Eagle No. 6 Mines aze underground coal mines located approximately seven <br />miles south of Cmig, Colorado, on State Highway 13. The mine sites, and adjacent area lie along the <br />notthem foot of the Williams Fork Mountains, which trend east to west. The elevation of the pemut azea <br />ranges from a low of approximately 6,130 feet in the Big Bottom azea, 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 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 permit azea is dominated by the Big Bottom alluvium, while <br />1 <br />I:\Env\Empire\AHR\2002\Text\Empire2002AH R.doc <br />