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INTRODUCTION <br />• The Twentymile Coal Company (TCC) Foidel Creek Mine is located approximately 25 miles southwest of <br />Steamboat Springs, Colorado at the south end of Twentymile Park (Figure 1). The associated Fish Creek <br />Tipple is located approximately 20 miles southwest of Steamboat Springs at the north end of Twentymile <br />Park. The Fish Creek Tipple and related areas cover approximately 70 acres. The TCC surface facilities <br />cover approximately 330 acres. <br />The Foidel Creek Mine portals and surface facility areas are bordered by spoil from the Colorado Yampa <br />Coal Company (CYCC) strip mines. The portals are faced-up in the down dip low-wall of the strip mine. <br />Hydrologic monitoring was initiated in the area during 1979. The Foidel Creek Mine was established in <br />1983, however, surface coal mining has been conducted in the area since the 1960's. The Fish Creek Tipple <br />was constructed in 1974. This report covers the hydrologic monitoring for the 1994 Water Year. Previous <br />monitoring results are presented in prior Annual Hydrologic Reports. The TCC Foidel Creek Mine <br />~I~ hydrologic monitoring program and the following discussions are divided into eight parts: 1) bedrock <br />\ .,~ ~~ groundwater, 2) alluvial groundwater, 3) surface water, 4) natural springs, 5) spoil springs, 6) mine water <br />~~ ~' discharge sites, 7) NPDES discharge sites, and 8) mine inflow monitoring. The Fish Creek Alluvial Valley <br />~~~t') Floor mining area hydrology data is presented in the First Half 1994 and Second Haif 1994 Subsidence <br />Reports previously submitted to the Division by TCC. Monitoring site locations and elevations are shown <br />• on Figure 2. For required monitoring frequencies and associated parameter lists the reader is referred to <br />Permit No. C-82-056 Exhibit 14. The 1994 Water Year data collected at each monitoring site is presented <br />as Tables 1 through 48. Data values returned during 1994 which are beyond previously established normal <br />ranges are italicized and bolded on these tables. Statistical summaries of selected site's period of record <br />data sets are presented as Tables la through 48a. Figures 1 and 2 depictthe general location of the project <br />area and specific monitoring locations associated with the TCC operations. Figures 3 through 91 provide <br />graphical representations of selected data. Figure 92 presents data documented during the 1994 Mine Inflow <br />Study. <br />Foidel Creek flows adjacent to the TCC Foidel Creek Mine surface facilities and receives treated effluent <br />from a series of sediment ponds established at the facility. Mine site drainage is controlled through seven <br />(7) sediment ponds (Ponds T, B, C, D, E, F, and G). The Fish Creek drainage is located north of the <br />Foidel Creek Mine surface facilities area and overlies tracts which have been longwall mined. Mine water <br />is discharged into Fish Creek via the Fish Creek Borehole facilities. At the Fish Creek Tipple site and to <br />the south of the TCC Foidel Creek Mine surface facilities are reclaimed areas of the surface operations <br />which have been released from bond. <br />Since mid-1987 hydrologic monitoring has been wnducted primarily by Cyprus personnel with water quality <br />analyses primarily performed by ACZ Laboratories (formerly Bookcliffs) of Steamboat Springs, Colorado. <br />. Prior to Jtme, 1986 some water quality analyses were performed by the CYCC laboratory. One surface <br />water site addressed in this report (USGS 09243800) is monitored for flow by the US Geologic Survey <br /> <br />-1- <br />