Laserfiche WebLink
2012 ANNUAL HYDROLOGY REPORT <br />1.0 INTRODUCTION <br />The following Annual Hydrology Report (AHR) presents hydrologic monitoring data from the Williams Fork <br />Mines site near Craig, Colorado for the 2012 calendar year. Site locations are described below. This AHR is <br />provided in fulfillment of reporting requirements under the Colorado State Division of Reclamation, Mining <br />and Safety (DRMS), Permit No. C -81 -044. All references to "2012" in this report refer to the 2012 calendar <br />year (January 1, 2012 through December 31, 2012). Monitoring results for prior calendar years (1983 <br />through 2011) are presented in previous AHRs, although selected historical data (period of record — POR) are <br />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 2012 <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's Eagle No. 5 and Eagle No. 6 Mines are underground coal mines located approximately <br />seven miles south of Craig, Colorado, on State Highway 13. The mine sites, and adjacent area lie along the <br />northern foot of the Williams Fork Mountains, which trend east to west. The elevation of the permit area <br />ranges from a low of approximately 6,130 feet in the Big Bottom area, to a high of about 7,400 feet in the <br />Williams Fork Mountains. The entire operation is located in Moffat County, Colorado. The general location <br />of the site is shown on Figure 1. <br />There are two 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 />C -81 -044 2012 AHR <br />