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• Creek via the Fish Creek Borehole facilities. At the Fish Creek Tipple site and to the south of the TCC Foidel <br />Creek Mine surface facilities are reclaimed azeas of the surface operations, which have been released from bond. <br />Since mid-1987 hydrologic monitoring has been conducted primarily by Cyprus personnel with water quality <br />analyses primarily performed by ACZ Laboratories (formerly Bookcliffs) of Steamboat Springs, Colorado. <br />Prior to June, 1986 some water quality analyses were performed by the CYCC laboratory. In May of 1995, a <br />private fnm (Miller Water Monitoring Service) was contracted to assist with hydrology monitoring at the Foidel <br />Creek Mine. Two surface water sites addressed in this report (USGS 09243800nad USGS 09243900) are <br />monitored for flow by the US Geologic Survey (USGS). Prior to the 1989 Water Year, the USGS also collected <br />and analyzed water quality samples from the site. Since the 1989 Water Year, Cyprus collects water quality <br />samples for subsequent analysis by ACZ laboratories. Unless otherwise indicated, all references to "1997" in <br />this report to refer to the 1997 Water Year. <br />BEDROCK GROUNDWATER MONITORING <br />The Wadge Overbwden formation (including the Wadge coal seam) overlies the Trout Creek Sandstone and <br />underlies the Twentymile Sandstone. All three geologic units are monitored within the Foidel Creek Mine permit <br />area. <br />• Wadae Overbwden: During 1997, seven Wadge Overbwden wells (009-79-4, FBR-11-A, 006-82-74C, <br />91M006, 008-77-58, 93M001, and 93M003) required monitoring for water levels, field parameters, and water <br />quality parameters on asemi-annual basis. All monitoring requirements were completed at these sites with field <br />measwements obtained and water quality samples collected during April, May, and September. Tables 1 <br />through 7 provide summaries of the 1997 Water Year data collected at each site. Tables la through 7a provide <br />period of record statistical summaries of collected data at each site. Tables lb through 76 provide period of <br />record water level summaries for each site. Figures 3 through 16 provide graphical representations of water <br />levels and selected water quality parameters recorded at each site. <br />The potentiometric surface in the Wadge Overburden is generally observed to slope from south to north in <br />monitored wells in the vicinity of the TCC facilities as shown by water levels in wells 009-79-4, 006-82-74C, <br />and 91M006. During 1997, water levels in wells 009-79-4 (Figwe 3) and 006-82-74C (Figwe 7) returned <br />values comparable to 1996 figwes with a more pronounced seasonal fluctuation evident and probably due to the <br />wetter than usual spring occurring in 1997. Well 91M006 (Figure 9) continued to show a steady decline in <br />water level. The potentiometric surface reflected by wells 93M001, 93M003, and FBR-I I-A is generally <br />observed to slope from southeast to northwest. Wells FBR-11-A (Figwe 5), 93M001 (Figwe 13), and 93M003 <br />(Figwe l5) all showed declines relative to last fall. These declines aze associated with mining of the Eastern <br />• Mining District (EMD). The potentiometric surface in the vicinity of well 008-77-58 (Figwe 11) is lower than <br />-2- <br />