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• SPOII. SPRING MONTI'ORING A spoil spring monitoring program was initiated in 1986 and will be conducted annually until such time as the monitoring requirement is eliminated. According to the approved plan, the annual mine-wide survey is conducted during May, and springs aze measured for flow and field parameters. If a spring is discharging 35 gallons per minute or greater then it is monitored throughout the remainder of the yeaz in accordance with the monitoring plan. Flow The field data for the May 1991 spoil spring monitoring program is presented on Table 49. A plot of the historic flow data for Station 114 is presented on Figure 42. No significant spoil springs were observed at Mine 2. The flow data indicates that the spoil springs follow the same pattern as the surface runoff: very low flow during most of the year and a very rapid increase in flow during the spring runoff followed by a moderately rapid decrease in flow. • Water Quality The summary of the May 1991 spoil spring field data are presented on Table 49. The summary of the water quality data for Station 114 is presented on Tables 53 and 54. Additional spoil spring data is presented on Tables 50 and 51 for Mine 1 and on Table 52 for Mine 2. Plots of the historic water quality data for Station 114 aze presented on Figures 43 and 44. The data for the Mine 1 spoils spring flows show a maximum field conductivity value of 4780 umhos/cm with an average value of approximately 3200 umhos/cm during 1991 spring runoff. During the winter when Foidel Creek flows are dominated by spoil spring discharges, the Creek's wnductivity level approaches that of the spoil springs. The conductivity of the spoil springs show temporal fluctuations that most likely reflect spoil recharge events of low TDS snowmelt. The lowest TDS concentrations in the spoil springs occur during the Spring snowmelt period. . Figure 50 indicates that the water quality in Foidel Creek is dominated by the water - 11 -