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2001 ANNUAL HYDROLOGY REPORT <br />1.0 INTRODUCTION <br />The following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the RAG Empire <br />Corporation (RAGEC) underground mine sites neaz Craig, Colorado for the 2001 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 "2001" in <br />this report refer to the 2001 calendaz year (January 1, 2001 through December 31, 2001). Monitoring results <br />for prior calendar years (1983 through 2000) aze presented in previous AHRs, although selected historical <br />data (period of record - POR) are summarized in some of the tables and figures within this AHR. Following <br />a discussion of Site Location and Background, this AHR provides a section on the RAGEC 2001 Hydrologic <br />Monitoring Program, which is further divided into the following subsections: <br />1) Groundwater Monitoring <br />2) Surface Water Monitoring <br />• Next follows a section discussing Hydrologic Impacts for the site. Tables and Figures (with associated <br />support data), and Appendices, are located in the tabbed sections at the back of this AHR. <br />2.0 SITE LOCATION AND BACKGROUND <br />RAGEC'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 l3. The mine sites, and adjacent area lie along the <br />northern foot of [he Williams Fork Mountains, which trend east to west. The elevation of the pemtit 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 nortltwestem Colorado rivers, which intersect the permit area. These are: 1) the <br />Yampa River and 2) the Williams Fork Rivet The Yampa River runs from north to south through the permit <br />area, while the Williams Fork River mns from south to north and intersects the Yampa Riverjust north of the <br />mine facilities area. The northern portion of the permit area is dominated by the Big Bottom alluvium, while <br />the southern and eastern portions of the permit area are dominated by the Williams Fork Mountains and the <br />river beds of the Yampa and Williams Fork Rivers. <br />The Eagle Mine sites are located in an azea, which has been historically mined by surface and underground <br />• mining. The earliest records of mining indicate that underground mining began in this area in the late 1920's <br />I:\Env\Empire\AHR\2001 \Text\Empire2001 AHR.doc <br />