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• 2006 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 located near Oak Creek, Colorado for the 2006 water year. Hydrologic monitoring locations and data results are discussed below. This AHR is provided in fulfillment of reporting requirements under the Colorado State Division of Reclamation Mining and Safety (DBMS) Permit No. C-82- 056. Unless otherwise indicated, all references to "2006" in this report refer to the 2006 Water Year (October 1, 2005 through September 30, 2006). 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 for comparison with 2005 data. Following Section 2.0's discussion of Site Location and Background, this AHR provides Section 3.0 on the TCC 2006 Hydrologic Monitoring Program, which in tum is divided into eight subsections: 3.1) Groundwater monitoring, 3.2) Alluvial groundwater monitoring, 3.3) Bedrock Surface water monitoring, 3.4) Spoil springs monitoring, 3.5) Natural springs monitoring, 3.6) Mine water discharge sites monitoring, 3.7) CDPS discharge sites monitoring, and 3.8) Mine inflow study. 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 provided in appendices located at the back of this AHR. 2.0 SITE LOCATION AND BACKGROUND The TCC Foidel Creek Mine site is located approximately 20 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 cumulative total of roughly 7,000 acres in south Routt County through 2006. In 2006, 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 loadout areas. The Foidel Creek Mine portals and surface facility areas are bordered by strip mine spoils from the former Colorado Yampa Coal Company (CYCC). Trench and berm rockfall mitigation structures, located north of the primary TCC facilities, cover approximately 30 acres. The coal refuse pile at TCC covers approximately 35 acres. Other associated satellite TCC support facilities contribute an additional 10 to 15 acres. The associated Fish Creek Tipple site is located approximately 15 miles southwest of Steamboat Springs at the north end of Twentymile Park, covering an area of approximately 15 acres.