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BPOIL BPRIN4 NONITORINO • 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 are 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 year in accordance with the monitoring plan. Flow The field data of the May, 1993 spoil spring monitoring program is presented on Table 49. A plot of the historic flow data for Station 114 is presented on Figure 42. Due to pumping of Site 114 for supply water by Twentymile Coal Company, the spoil spring did not discharge for the 1993 water year. 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 Oualit The summary of the May, 1993 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 are presented on Figures 43 and 44. The data for the Mine 1 spoil springs flows show a maximum field conductivity value of 5150 umhos/cm with an average value of approximately 2500 umhos/cm during the 1993 water year. During the winter when Foidel Creek flows are dominated by spoil spring discharges, the Creek's conductivity 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 quality of the discharge from Pond A. Pond a receives the discharge of the largest spoil springs. The spoil springs are characterized by high dissolved solids, calcium, magnesium, sulfate and SAR compared with bedrock groundwater and unaffected surface waters. Station 114 also shows comparatively high manganese and high nitrate levels. Most of the Mine 1 spoil springs have elevated manganese levels. Due to the small size of the flows and the low conductivity (1630 . 8