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INTRODUCTION <br />The Twentymile Coal Company Foidel Creek Mine is located approximately 25 <br />miles southwest of Steamboat Springs, Colorado on the south end of Twentymile Park <br />(Figure 1). The surface facilities cover approximately 190 acres. Approximately <br />24 acres of the Wadge Coal seam have been mined using continuous miners. Of this <br />area approximately 1.3 acres have been pillared. A spur of the Denver and Rio <br />Grande Western Railroad runs to the site. Immediately north of the portal area is <br />Foidel Creek into which the mine water is discharged. The site drainage is into <br />two sediment ponds(Pond D and Pond G) which drain northward into Foidel <br />Creek. Further north of the portal area is Fish Creek. In the future mining is <br />planned to extend into the Fish Creek drainage. The portal area is bordered by <br />spoils from the Colorado Yampa Coal Company (CYCC) strip mines. The portal is <br />faced-up in the down dip low-wall of the strip mine. <br /> Hydrologic Monitoring has been conducted in the area since 1979. The <br /> underground mine was begun in 1983; however,surface coal mining has been conducted <br /> in the immediate vicinity since the 1960's. This report covers the hydrologic <br /> monitoring for calendar year 1986. The previous monitoring of this area was <br /> presented in the 1985 Annual Hydrologic Report. The hydrologic monitoring has <br />' been divided into five parts: 1) ground water, 2) surface water, 3) springs, 4) <br />mine inflows, and 5) effluent sites. The monitoring locations are shown on Figure <br />2 and summarized on Table 1. The parameter lists are shown on Table Z through 4. <br />A complete listing of all water data collected at these sites is submitted <br />' separately. Summaries of the complete data set and the 1986 water year data are <br />presented on Tables 5 to 52 and Figures 3 to 41. Most of the monitoring is <br />conducted by a consultant, Al Miller of Steamboat Springs, Colorado. Some of the <br />sampling is conducted by mine personnel. Most of the water quality analyses were <br />performed by ACZ Laboratories (formerly Bookcliffs) of Steamboat Springs, <br />' Colorado. Prior to June, 1986 some of the water quality testing was performed by <br />the Colorado Yampa Coal Company laboratory. <br />J <br /> <br />