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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 Twentymile Coal <br />Company's (TCC's) Foidel Creek Mine site located near Oak Creek, Colorado for the 2005 water year. <br />Hydrologic monitoring locations and data results are discussed below. This AHR is provided in fulfillment of <br />reporting requirements under the Colorado State Division of Minerals and Geology (DMG) Permit No. C-82-056. <br />Unless otherwise indicated, al] references to "2005" in this report refer to the 2005 Water Year (October 1, 2004 <br />through September 30, 2005). Monitoring results for prior water years are presented in previous AHRs, although <br />historical data from prior years are summarized in same of the tables and figures for comparison with 2005 data. <br />Following Section 2.0's discussion of Si[e Location and Background, [his AHR provides Section 3.0 on the TCC <br />2005 Hydrologic Monitoring Program, which in turn is divided into eight subsections: <br />3.1} Groundwater monitoring, <br />3.2) Alluvial groundwater monitoring, <br />3.3) Bedrock Surface water monitoring, <br />3.4) Spoil springs monitoring, <br />3.5) Natural springs monitoring, <br />• 3.6) Mine water discharge sites monitoring, <br />3.7) CDPS discharge sites monitoring, and <br />3.8) Mine inflow study. <br />Next follows Section 4.Q, discussing Subsidence impacts for local creeks (Fish, Foidel, and Middle Creeks), and <br />lastly Section 5.0, Summary and Conclusions. Tables and Figures are provided in appendices located at the back <br />of [his AHR. <br />2.0 SITE LOCATION AND BACKGROUND <br />The TCC Foidel Creek Mine site is located approximately 20 miles southwest of Steamboat Springs, Colorado, at <br />[he south end of Twen[ymile Park (see Figure 1). This is an active underground coal mining operation, having <br />affected a cumulative total of roughly 7,000 acres in south Routt County through 2005. In 2005, TCC mining <br />affected on the order of 1,300 acres. The primary TCC surface facilities cover on the order of 800 acres, <br />including discharge pond and railroad loadout areas. The Foidel Creek Mine portals and surface facility azeas are <br />bordered by strip mine spoils from the farmer Colorado Yampa Coal Company (CYCC). Trench and berm <br />rockfall mitigation structures, located north of the primary TCC facilities, cover approximately 30 acres. The <br />coal refuse pile at TCC covers approximately 35 acres. Other associated satellite TCC support facilities <br />contribute an additional 10 to 15 acres. The associated Fish Creek Tipple site is located approximately 15 miles <br />• southwest of Steamboat Springs at the north end of Twentymile Park, covering an area of approximately 15 acres <br />1 <br />