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INTRODUCTION <br />The Colorado Yampa Coal Company Mine No. 3 is located approximately 25 miles southwest <br />of Steamboat Springs, Colorado in Twentymile Park (Figure 1). It was primarily a surface coal <br />mining operation with limited underground mining. The surface mine, which was activated <br />between 1974 and 1980, was called Mine No. 3. It was faced-up in a Mine No. 3 highwall. <br />Operations began May 16, 1979, but the mine was abandoned on June 5, 1980 due to adverse <br />mining conditions. No significant amounts of coal were extracted. The Wadge coal seam was <br />extracted at both mines. There is no active mining in this area and a total of approximately 296 <br />acres were disturbed. Mine 3 straddles the confluence of Middle and Foidel Creeks. A small <br />portion of Mine No. 3 drains into Fish Creek; however, bond has been released for this area. <br />All impacts related to Fish creek aze discussed in the 1990 Water Yeaz Annual Hydrologic <br />Report for the foidel Creek Mine (Permit No. C-82-056). Mine No. 3 azea has been backfilled, <br />regraded, and revegetated. An administrative facility located in the Mine 3 azea is still used by <br />Colorado Yampa Coal Company. County road 33 runs through the site. <br />Hydrologic monitoring has been conducted in the azea since 1975. This report covers the <br />hydrologic monitoring for the Water Year 1990. The previous monitoring of this azea was <br />presented in the previous Annual Hydrologic Reports. The hydrologic monitoring has been <br />divided into four parts: 1) ground water, 2) surface water, 3) spoil springs, and 4) efFluent <br />sites. The monitoring locations are shown on Tables 2 and 3 and summarized on Table 1. The <br />parameter lists are shown on Tables 2 and 3. A complete listing of all water data collected at <br />the monitoring sites is submitted sepazately. Summaries of the complete data set and the 1990 <br />data are presented on Tables 4 to 24 and Figures 4 to 21. <br />Since mid-1987 most of the monitoring has been conducted by Cyprus personnel. Most of the <br />water quality analyses were performed by ACZ Laboratories (formerly Bookcliffs) of Steamboat <br />-1- <br />