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2014 ANNUAL HYDROLOGY REPORT <br />1.0 INTRODUCTION <br />The following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the Williams Fork <br />underground mine sites near Craig, Colorado for the 2014 calendar year. Site locations are described below. <br />This AHR is provided in fulfillment of reporting requirements under the Colorado State Division of <br />Reclamation, mining and Safety (DRMS), Permit No. C -81 -044. All references to "2014" in this report refer <br />to the 2014 calendar year (January 1, 2014 through December 31, 2014). Monitoring results for prior <br />calendar years (1983 through 2012) are presented in previous AHRs, although selected historical data (period <br />of record — POR) are summarized in some of the tables and figures within this AHR. <br />Following a discussion of Site Location and Background, this AHR provides a section on the 2014 <br />Hydrologic Monitoring Program, which is further divided into the following subsections: <br />1) Groundwater Monitoring <br />2) Surface Water Monitoring <br />This is followed by the Summary and Conclusions Section. Tables, Figures, and back -up documentation are <br />located in the tabbed sections at the back of this AHR. <br />2.0 SITE LOCATION AND BACKGROUND <br />Williams Fork No. 5 and Eagle No. 6 Mines are underground coal mines located approximately seven miles <br />south of Craig, Colorado, on State Highway 13. The mine sites, and adjacent area lie along the northern foot <br />of the Williams Fork Mountains, which trend east to west. The elevation of the pen-nit area ranges from a low <br />of approximately 6,130 feet in the Big Bottom area, to a high of about 7,400 feet in the Williams Fork <br />Mountains. The entire operation is located in Moffat County, Colorado. The general location of the site is <br />shown on Figure 1. <br />There are two (2) major northwestern Colorado Rivers, which intersect the permit area. These are: 1) the <br />Yampa River and 2) the Williams Fork River. The Yampa River runs from north to south through the permit <br />area, while the Williams Fork River runs from south to north and intersects the Yampa River just 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 />U -8I -044 2014 AIIR <br />