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2004 ANNUAL HYDROLOGY REPORT 1.0 INTRODUCTION The following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the Twentymile Coal Company's (TCC's) Foidel Creek Mine site located in Oak Creek, Colorado for the 2004 water year. Hydrologic monitoring locations and data results are described below. This AHR is provided in fulfillment of reporting requirements under the Colorado State Division of Minerals and Geology (DMG) Permit No. C-82-056. Unless otherwise indicated, all references to "2004" in this report refer to the 2004 Water Year (October 1, 2003 through September 30, 2004). Simi]arily, unless otherwise indicated, discussions or hydrologic data refer to the 2004 water year. Monitoring results for prior water years are presented in previous AHRs, although historical data from prior years are summarized in some of the tables and figures within this AHR for the purpose of comparison with 2004 data. Following Section 2.0's discussion of Site Location and Background, this AHR provides Section 3.0 on the TCC 2004 Hydrologic Monitoring Program, which in tum is divided into eight subsections: • 3.1) 3.2) 3.3) 3.4) 3.5) 3.6) 3.7) 3.8) Groundwater monitoring, Alluvial groundwater monitoring, Bedrock Surface water monitoring, Spoil springs monitoring, Natural springs monitoring, Mine water discharge sites monitoring, CDPS discharge sites monitoring, and Mine inflow monitoring. Next follows Section 4.0, discussing Subsidence Impacts for local creeks (Fish, Foidel, and Middle Creeks), and lastly Section 5.0, Summary and Conclusions. Tables and Figures are appendices located at the back of this AHR. 2.0 SITE LOCATION AND BACKGROUND The TCC Foidel Creek Mine site is located approximately 25 miles southwest of Steamboat Springs, Colorado, at the south end of Twentymile Park (see Figure 1). This is an active underground coal mining operation, having affected a wmulative total of roughly 7,000 acres in south Routt County through 2004. In 2004, TCC mining affected on the order of 1,300 acres. The primary TCC surface facilities cover on the order of 800 acres, • including discharge pond and railroad ]oadout areas. The Foide] Creek Mine portals and surface facility areas are bordered by strip mine spoils from the former Colorado Yampa Coal Company (CYCC). Trench and berm 1