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• dry since it was installed. During ]992, the well was determined to have a separated casing. As a result, CYCC installed a replacement spoil monitoring well (008-SP-4B) near the northern embanlmrent of Pond M3S (Site 76). Due [o the 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 m the two currently monitored Mine 3 spoil wells are presented as Figures 12 and 13 in this report. 1997 water levels were measured at depths typical for these sites. Tables 8B and 9B provide period of record statistical summary information 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 008-SP-SA during 1997 were without exception within the established ranges historically associated with this site. Two water quality constituent concentrations measured for well 008-SP-4B during 1996 fell beyond the ranges previously established for this site. During August a new ma.+timum value was noted for bicarbonate, while a new minimum value was noted for dissolved manganese. 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 acalcium-sulfate type with high bicarbonate and relatively low SAR. The water is higher m dissolved solids than the background bedrock levels. The 1997 data does not indicate any significantly high trace metals concentrations, • SURFACE WATER MONITORING Foidel Creek in the vicwty of Mine 3 is monitored for flow and water quality a[ 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 Crcek in the vicinity of Mine 3 is monitored for flow and water quality at two (2) locations. USGS Site 09243700, also known as Site 700, is located on Middle Creek approximately one mile upstream of the confluence of Foidel and Middle Creeks; Si[e 29 is located on Middle Creek approximately one mile downstream of the confluence with Foidel Creek (see Figure 2). Flows - Streamflow measurements are gauged at the two USGS sites and at Site 29. Due to the size of fhe streams at the established monitoring locations, flows are rated rasher than measured using a more accurate controlled section such as a flume. The USGS maintains continuous recorders at Sites 700 and 900 and provides data summaries to CYCC. Plots of historic maximum, minimum, and mean flow measurements on Foidel Creek at Site 900 are presented as Figure 15 in this report. The 1997 Water Year runoff hydrograph for site 900 is presented as Figure 16. Plots of historic maximum, minimum, and mean flow measurements on Middle Creek at Site 700 are presented as Figure 17. The 1997 Water Year runoff hydrograph for site 700 is presented as Figure 18. Mean historic monthly flows for Site 29 are presented as Figure 19; flow data for the 1997 Water Year as Figure 20. Selected flow rate data consisting of historical and 1997 Water Year maximum and minimum recorded flows, and 1997 irrigation season (June through September) mean flows for Sites 900,700, and 29 are presented on Table l6. Flow magnitudes in general were noted to be lower than those experienced during 1996. • 1997 Water Year data for these sites shows typical seasonal venation with rapid rise and fall of flow rates associated with spring runoff Historically these Three surface water sites otton stopped flowing 4