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The Twentymile Coal Company (TCC) Foidel Creek Mine is located approximately 25 miles southwest of Steamboat Springs, Colorado at the south end of Twentymile Park (Figure I). The associated Fish Creek Tipple is located approximately 20 miles southwest of Steamboat Springs at [he north end of Twentymile Park. The TCC surface facilities cover approximately 330 acres. The Fish Creek Tipple area covers approximately I S acres. The trench and berm rockfall mitigation structures located north of the primary TCC facilities cover approximately 30 acres. The coal refuse pile at TCC covers approximately 70 acres. Other associated satellite TCC support facilities contribute approximately an additional 10 to I S acres of disturbance. The Foidel Creek Mine portals and surface facility areas are bordered by spoil from the Colorado Yampa Coal Company (CYCC) strip mines. The portals are faced-up in the down dip low-wall of the strip mine. Hydrologic monitoring was initiated in the area during 1979. The Foidel Creek Mine was established in 1983, however, surface coal mining has been conducted in the area since the 1960's. The Fish Creek Tipple was constructed in 1974. This report covers the hydrologic monitoring for the 1998 Water Year. Previous monitoring results are presented in prior Annual Hydrologic Reports. The TCC Foidel Creek Mine hydrologic monitoring program and [he following discussions are divided into eight parts: 1) bedrock groundwater, 2) alluvial groundwater, 3) surface water, 4) natural springs, 5) spoil springs, 6) mine water discharge sites, 7) NPDES discharge sites, and 8) mine inflow monitoring. Fish Creek Alluvial Valley Floor mining area hydrology data has been presented previously • in [he First Half 1994 and Second Half 1994 Subsidence Reports submitted to the Division by TCC. Monitoring site locations and elevations are shown on Figure 2. For required monitoring frequencies and associated parameter lists the reader is referred to Permit No. C-82-056 Exhibit 14. The 1998 Water Year data collected a[ each monitoring site is presented as Tables I through 49 and 51 through 65. Data values returned during 1998 which lie beyond previously established ranges are highlighted on the tables providing 1998 Water Year data. Table 50 provides a historical summary of flow rate data for the surface water monitoring sites. Table 66 provides low-quality coal haulage figures for the 1998 Water Year. Statistical summaries of monitoring site's period of record data sets follow the 1998 Water Year data. Period of record statistical summaries of water levels or flows as appropriate are presented as well. Figures 1 and 2 depict the general location of the project area and specific monitoring locations associated with the TCC operations. Figures 3 through 119 provide graphical representations of selected data. Figure 120 presents data documented during the 1998 Mine Inflow Study. Foidel Creek Flows adjacent to the TCC Foidel Creek Mine surface facilities and receives treated effluent from a series of sediment ponds established at the facility. Mine site drainage is controlled through seven (7) sediment ponds (Ponds T, B, C, D, E, F, and G). Mine water is discharged from the mine and routed through Pond D prior to being discharged to Foidel Creek. The Fish Creek drainage is located north of the Foidel Creek Mine surface facilities area and overlies tracts, which have been longwall mined. Mine water is discharged into Fish Creek via the Fish Creek Borehole facilities. At the Fish Creek Tipple site and to the south of the TCC Foidel Creek Mine . surface facilities are reclaimed areas of the surface operations, which have been released from bond.