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• of Pond M3S (Site 76). Due to 11te timing of this installation, CYCC did not provide initial monitoring information for the replacement well until the 1993 AHR submittal. Water Levels -Plots of historic water levels in the hvo currently monitored Mine 3 spoil wells are presented as Figures 12 and 13 in this report. 1998 water levels were measured at depths typical for these sites. Tables 8B and 9B provide period of record statistical summary inforntation for water levels at wells 008-SP-4B and 008-SP-SA. Water Quality -Water quality data for the Mine No. 3 spoil wells is presented on Tables 8, 8A, 9, and 9A. A plot of historic total dissolved solids concentration for well 008-SP-SA is presented as Figure 14. Water quality constituent concentrations for all parameters monitored at well 0(IS-SP-SA during 1998 were within the established ranges historically associated with this site, except for the new minimum value recorded for pH (lab) in August. Three water quality constituent concentrations measured for well 008-SP-4B during 1998 fell beyond the rmtges previously established for this site. During May a new maximum value was recorded for conductivity (lab}, and new minimum values were recorded for pH (lab) and SAR in August. Two full suite analyses are required from each spoil well, these were collected in May and August. Dissolved solids concentrations appear highly variable in well 008-SP-SA (see Figure 14). The spoil well water is a calciwu-sulfate type with high bicarbonate and relatively low SAR. The water is higher in dissolved solids than [he background bedrock levels. The 1998 data does not indicate any significantly high trace metals concentrations. • Sl1RFACE WATER MONITORING Foidel Creek in the vicinity of Mine 3 is monitored for flow and water quality at USGS Site 09243900 also known as Site 900. Site 900 is located on Foidel Creek approximately one-half mile upstream of the confluence of Foidel and Middle Creeks (see Figure 2). Middle Creek in the vicinity of Mine 3 is monitored for flow and water quality at hvo (2) locations. USGS Site 09243700, also known as Site 700, is located on Middle Creek approximately one mile upstream of dte cotdluence of Foidel and Middle Creeks; Site 29 is located on Middle Creek approximately one mile downstream of [he confluence with Foidel Creek (see Figure 2). Flows - Streamflow measurements are gauged at [he pvo USGS sites and at Site 29. Due to the size of the streams at the established monitoring locations, flows are rated rather than measured using a more accurate controlled section such as a flwne. The USGS maintains continuous recorders at Sites 700 and 900 and provides data sunwtaries to CYCC. Plots of historic maximum, minimum, and mean Clow measurements on Foide! Creek at Site 900 are presented as Figure IS in this report. The 1998 Water Year runoff hydrograph for site 900 is presented as Figure IG. Plots of historic maximum, minimum, and mean flow measurements on Middle Creek at Site 700 are presented as Figure 17. The 1998 Water Year runoff hydrograplt for site 7(1(1 is presented as Figure 18. Mean historic monthly flows for Site 29 are presented as Figure 19; flow data for the 1998 Water Year as Figure 20. Selected Clow rate data consisting of historical and 1998 Water Year maximum and minimum recorded flows, and 1998 irrigation season (June tlvough September) mean Oows for Sites 900,700, and 29 are presented on Table I G. Flow magnitudes in general o•ere noted to be very similar to those experienced during 1997. 1998 Water Year data for these sites shows typical seasonal variation with rapid rise and fall of flow • rates associated with spring runoff. Historically these tlvce surface water sites often slopped (lowing during the fall and wmtcr. Currently however, and since approximately 1985, Sites 900 and 29 have 4