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INTRODUCTION <br />The Colorado Yampa Coal Company Mine 1, Mine 2 and Eckman Park Mine are <br />located approximately 25 miles southwest of Steamboat Springs, Colorado in <br />Twentymile Pazk (Figure 1). They are all inactive surface wal mining operations. <br />Mine 1 and the Eckman Pazk Mine (collectively called Mine 1 in this report) are <br />located neaz the top of the Foidel Creek drainage in the south end of Twentymile Park. <br />A very small portion of the disturbed area extends into the Middle Creek drainage. <br />The Wadge coal seam was extracted during active mining operations. Active mining <br />has ceased with a total of approximately 2200 acres having been mined in Eckman <br />Park. Reclamation activities continue in this area. A total area of approximately 3175 <br />acres has been disturbed at Mine 1. This includes a coal loadout, maintenance and <br />administrative facilities. Also, Mine 1 is adjacent to Twentymile Coal Company's <br />Foidel Creek underground mine. The operations share some of the discharge control <br />facilities. A spur of the Denver and Rio Grande Western Railroad runs to the site. <br />• Mine 2 is located on the south side of the Fish Creek drainage in the middle of <br />Twentymile Pazk. The Fish Creek coal seam, which overlies the Wadge Coal seam <br />was extracted at Mine 2. No active mining is taking place at Mine No. 2 and the area <br />has been completely backfilled, regraded, and revegetated. A total azea of <br />approximately 885 acres was disturbed at Mine 2. <br />Hydrologic monitoring has been conducted in the area since 1975. Surface coal mining <br />and reclamation activities in the Mine 1 area were wnducted from 1960's to 1991. <br />Surface coal mining in the Mine 2 area was conducted from 1975 to 1981. This report <br />covers the hydrologic monitoring for the 1991 water year. The previous monitoring of <br />this azea was presented in the previous Annual Hydrologic Reports. The hydrologic <br />monitoring has been divided into four parts: 1) ground water, 2) surface water, 3) <br />spoil springs, and 4) effluent sites. The monitoring locations aze shown on Figures 2 <br />and 3 and summarized on Table 1. The parameter lists are shown on Tables 2 and 3. <br />A complete listing of all water data collected at the monitoring sites is submitted <br />separately. Summaries of the complete data set and the 1991 data are presented on <br />• Tables 4 to 71 and Figures 4 to 53. Unless otherwise indicated reference to a year <br />means a water year. <br />- 1 - <br />