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2015 ANNUAL HYDROLOGY REPORT <br />1.0 INTRODUCTION <br />The following Annual Hydrology Report (AHR) presents 2015 hydrologic monitoring data from the Twentymile <br />Coal, LLC's (TC's) Foidel Creek Mine located near Oak Creek, Colorado. Hydrologic monitoring locations and <br />specific data results are discussed below. This AHR fulfills the reporting requirements under the Colorado State <br />Division of Reclamation Mining and Safety (DRMS) Permit No. C-82-056. Unless otherwise indicated, all <br />references to "2015" in this report refer to the 2015 Water Year (October 1, 2014 through September 30, 2015). <br />Monitoring results for prior water years are presented in previous AHRs, although selected historical data from <br />prior years are summarized in some of the tables and figures for comparison with 2015 data. <br />Following Section 2.0's discussion of Site Location and Background, this AHR provides Section 3.0 on the TC <br />2015 Hydrologic Monitoring Program, which in turn is divided into nine subsections: <br />3.1) Bedrock Groundwater monitoring, <br />3.2) Alluvial groundwater monitoring, <br />3.3) 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 />3.9) Water Balance <br />Next follows Section 4.0, 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 this AHR. <br />2.0 SITE LOCATION AND BACKGROUND <br />The TC Foidel Creek Mine site is located approximately 20 miles southwest of Steamboat Springs, Colorado, at <br />the south end of Twentymile Park (see Figure 1). This is an active underground coal mining operation, having <br />affected a cumulative total of roughly 15,200 acres in south Routt County through 2015. The total Life -Of -Mine <br />permit area encompasses approximately 22,530 acreas. The primary TC surface facilities cover about 800 acres, <br />including discharge ponds and railroad loadout areas. The Foidel Creek Mine portals and surface facility areas <br />are bordered on the south and south west by strip mine spoils from the former Colorado Yampa Coal Company <br />(CYCC). Trench and berm rockfall mitigation structures, located north of the primary TC facilities along Routt <br />County Road 27 beneath the Twentymile Sandstone cliffs, covers approximately 30 acres. The coal refuse pile is <br />currently at 105 acres (as of July 2016). Expansion of the refuse pile footprint was intended to add an additional <br />1 <br />