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INTRODUCTION The Colorado Yampa Coal Company Mine 1, Mine 2 and Eckman Park Mine are located approximately 25 miles southwest of Steamboat Springs, Colorado in Twentymile Park (Figure 1). They are all inactive surtace coal mining operations. Mine 1 and the Eckman Park Mine (collectively called Mine 1 in this report) are located near the top of the Foidel Creek drainage in the south end of Twentymile Park. Avery small portion of the disturbed area extends into the Middle Creek drainage. The Wadge Coal seam was extracted during active mining operations. Active mining has ceased with a total of approximately 2200 acres having been mined in Eckman Park. Only a small dragline "parking" area remains to be reclaimed at the operation. A total of approximately 3175 acres has been disturbed at Mine 1. This includes a coal loadout, and maintenance and administrative facilities, most of which have been transferred to Twentymile Coal Company. Also, Mine 1 is adjacent to Twentymile Coal Company's Foidel Creek underground mine. The operations share some of the discharge control facilities. A spur of the Southern Pacific Railroad runs to the mine site. Mine 2 is located on the south side of the Fish Creek drainage in the middle of Twentymile Park. The Fish Creek coal seam, which overlies the Wadge coal seam, was extracted at Mine 2. No active mining is taking place at Mine No. 2 and the area has been completely backfilled, regraded, and revegetated. A total of approximately 885 acres were disturbed at Mine 2. • Hydrologic monitoring has been conducted in the area since 1975. Surface coal mining and reclamation activities in the Mine 1 area were conducted from the 1970's to 1991. Surface coal mining in the Mine 2 area was conducted from 1975 to 1981. This report covers the hydrologic monitoring for the 1998 water year. The previous monitoring of this area has been presented in prior Annual Hydrologic Reports. The following discussions regarding 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 Figures 2 and 3 and monitoring requirements are summarized on Table 1. The required monitoring parameter lists are shown on Tables 2 and 3. Complete listings of all water data collected at the monitoring sites during the 1998 water year are provided with this report on Tables 4 through 49. Statistical summaries of period of record water quality data are typically presented as Tables 4a through 49a. Statistical summaries of period of record flow rate or water level data as appropriate are typically provided as Tables 4b through 49b. Surface water station historical flow summaries are presented on Table 17. Spoil spring survey data from May 1998 is presented on Table 30 and sediment pond flow summary information is presented on Table 44. Selected data is plotted on Figures 4 through 76. Unless otherwise indicated, reference to a year means the 1998 water year (October 1, 1997 through September 30, 1998). Hydrologic monitoring during 1998 was conducted by Colorado YampalTwentymile Coal Company personnel and Miller Water Monitor Service. Water quality analyses were performed by ACZ Laboratories of Steamboat Springs, Colorado. Until the 1989 water year the U. S. Geological Survey (USGS) collected and analyzed the water samples for three surface water monitoring sites (USGS 09234700, 09243800 and 09234900). Beginning in the 1989 water . year, Cyprus collected the samples and ACZ Laboratories analyzed the samples, however, USGS continued to monitor flows. cycc98 06/11/99 1