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The Colorado Yampa Coal Company Mine No. 3 is located approximately 25 miles southwest of Steamboat Springs, Colorado in Twentymile Park (Figure 1). This was primarily a surface coal mining operation with limited underground mining. The surface mine, which was active between 1974 and 1980, was called Mine No. 3. The underground operation, known as the Middle Creek Mine, was faced-up in a Mine No. 3 highwall. Underground operations began May 16, 1979, but the mine was abandoned on June 5, 1980 due to adverse mining conditions. No significant amounts of coal were extracted by the underground operation. The Wadge coal seam was extracted at both mines. There is no active mining in this area and a total of approximately 350 acres were disturbed. Mine 3 straddles the confluence of Middle and Foidel Creeks. A small portion of Mine No. 3 drains into Fish Creek; however, bond has been released for this area. All impacts related to Fish creek are discussed in the Annual Hydrologic Report for the Foidel Creek Mine (Permit No. C-82-056). The Mine No. 3 area has been backfilled, regraded, and revegetated. An administrative facility located in the Mine 3 area is still used by Colorado Yampa Coal Company and the Trout Creek Ranch. County road 33 runs through the site. Hydrologic monitoring has been conducted in the area since 1975. This report covers the hydrologic monitoring for the Water Year 1993. The previous monitoring of this area has been presented in the prior Annual Hydrologic Reports. The hydrologic monitoring has been divided into four parts: 1) ground water, 2) surface water, 3) spoil springs, and 4) effluent sites. The monitoring locations are shown on Figure 2 and are summarized on Table 1. The associated parameter lists are shown on Tables 2 and 3. A listing of the water year data collected at the monitoring sites is submitted as a separate section. Summaries of the complete data set and the 1993 data are presented on Tables 4 to 24 and Figures 4 to 21. Since mid-1987 most of the monitoring has been conducted by Cyprus personnel. Most of the water quality analyses were performed by ACZ Laboratories (formerly Bookcliffs) of Steamboat Springs, Colorado. Prior to June, 1986 some of the water quality testing was performed by the Colorado Yampa Coal Company laboratory. Two sites are monitored for flow by the US Geologic Survey (USGS). Until the 1989 Water Year the USGS also collected and analyzed the water samples for the two sites. Beginning the 1989 water Year Cyprus collected the samples and ACZ laboratories analyzed the samples. Unless otherwise indicated all references to "1993" in this report to refer to Water Year 1993. /• Page 1