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• 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. Prior <br />to June, 1986 some water quality analyses were performed by the CYCC laboratory. In May of 1995, a private <br />firm (Miller Water Monitoring Service) was contracted to assist with hydrology monitoring at the Foidel Creek <br />Mine. Two surface water sites addressed in this report (USGS 09243800nad USGS 09243900) are monitored for <br />flow by the US Geologic Survey (USGS). Prior to the 1989 Water Year, the USGS also collected and analyzed <br />water quality samples from the site. Since the 1989 Water Year, Cyprus collects water quality samples for <br />subsequent analysis by ACZ laboratories. Unless otherwise indicated, all references to "1998" in this report to <br />refer to the 1998 Water Year. <br />BEDROCK GROUNDWATER MONITORING <br />The Wadge Overburden formation (including the Wadge coal seam) overlies the Trout Creek Sandstone and <br />underlies [he Twentymile Sandstone. All three geologic units are monitored within [he Foidel Creek Mine permit <br />area. <br />Wadge Overburden: During 1998, seven Wadge Overburden wells (009-79-4, FBR-1 I-A, 006-82-74C, 91M006, <br />• 008-77-58, 93M001, and 93M003) required monitoring for water levels, field parameters, and water quality <br />parameters on asemi-annual basis. All monitoring requirements were completed at these sites with field <br />measurements obtained and water quality samples collected during April, May, and September. Tables 1 through <br />7 provide summaries of the 1998 Water Year data collected at each site. Tables la through 7a provide period of <br />record statistical summaries of collected data at each site. Tables I b through 7b provide period of record water <br />level summaries for each site. Figures 3 through 16 provide graphical representations of water levels and selected <br />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, and <br />91M006. During 1998, The water levels in wells 009-79-4 (Figure 3) returned values comparable to those of <br />recent years. 006-82-74C (Figure 7) shows a steady increase in the water level, while Well 91M006 (Figure 9) <br />continued to show a steady decline in water level. The potentiomeVic surface relected by wells 93M001, <br />93M003, and FBR-11-A is generally observed to slope from southeast to northwest. Wells FBR-1 I-A (Figure 5), <br />93M001 (Figure 13), and 93M003 (Figure 15) all showed declines relative to last fall. These declines are <br />associated with mining of the Eastern Mining District (EMD). The potentiometric surface in the vicinity of well <br />008-77-58 (Figure 1 I) is slightly lower than that occurring over the EMD. This well experienced an unusually <br />long seasonal decline during 1998, but the previously established recovering water level Vend continues. <br />• Seasonal fluctuations in water levels are pronounced at this site. <br />-2- <br />