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SPOIL SPRING MONITORING <br />• A spoil spring monitoring program was initiated in 1986 and will be conducted annually until <br />such time as the monitoring requirement is eliminated. According to the approved plan, the <br />annual mine-wide survey is conducted during May, and springs aze measured for flow and field <br />parameters. If a spring is discharging 35 gallons per minute or greater then it is monitored <br />throughout the remainder of the year in accordance with the monitoring plan. <br />Flow <br />The field data of the May 1992 spoil spring monitoring program is presented on Table 49. A <br />plot of the historic flow data for Station 114 is presented on Figure 42. Due to pumping of Site <br />114 for supply water by Twentymile Coal Company, the spoil spring did not discharge for most <br />of the 1992 water year. No significant spoil springs were observed at Mine 2. The flow data <br />indicates that the spoil springs follow the same pattern as the surface runoff: very low flow <br />during most of the year and a very rapid increase in flow during the spring runoff followed by <br />a moderately rapid decrease in flow. <br />Water Quality <br />- - -- <br />The summary of the May 1992 spoil spring field data are presented on Table 49. The summary <br />of the water quality data for Station 114 is presented on Tables 53 and 54. Additional spoil <br />spring data is presented on Tables 50 and 51 for Mine 1 and on Table 52 for Mine 2. Plots of <br />the historic water quality data for Station 114 are presented on Figures 43 and 44. <br />The data for the Mine 1 spoils spring flows show a maximum field conductivity value of 5620 <br />umhos/cm with an average value of approximately 3350 umhos/cm during 1992 water year. <br />During the winter when Foidel Creek flows are dominated by spoil spring discharges, the <br />Creek's conductivity level approaches that of the spoil springs. The conductivity of the spoil <br />springs show temporal fluctuations that most likely reflect spoil recharge events of low TDS <br />snowmelt. The lowest TDS concentrations in the spoil springs occur during the Spring snowmelt <br />period. <br />10 <br />