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• 1992 Annual Hydrologic Report <br />Page 2 <br />The enclosed graph shows that the conductivity of spring SP-1 has <br />consistently been below its historic average during the period 1989 <br />through 1992. For Spring SP-3, the enclosed graph shows that its <br />conductivity has consistently been above its historic average and <br />below its historic maximum. There is no indication that the water <br />from the flooded mine workings is discharging into the alluvial <br />aquifer. <br />The hydrologic monitoring program provides for monitoring to determine <br />if run-off from the mine site has any impact on the water quality in <br />the Carbon Ditch. SP-D is the upstream monitoring point and SP-DA is <br />the downstream monitoring point on the Carbon Ditch. SP-D is located <br />on the Carbon Ditch at a point that would not be impacted by surface <br />run-off from the mine site. SP-DA is located downstream on the Carbon <br />Ditch at a point that could be impacted by surface run-off from the <br />mine site. Both points are monitored during May and September for <br />field parameters and total suspended solids, (TSS). In May the TSS <br />for SP-D and SP-DA was 340 and 180 respectively which indicates that <br />no degradation of the quality of flow occurred on this stretch of the <br />ditch.' The ditch did not have flow when the monitoring was performed <br />for September. <br />The sediment pond did not discharge during the year. The pond did not <br />have any significant amount of water in it during the year. A few <br />puddles in the pond were noted by DMG during their inspections. <br />GROUND WATER <br />Table G-92 shows the ground water monitoring results for this water <br />year compared to the averages of previous monitoring results for the <br />same months. The alluvial piezometers near the sediment pond are the <br />only ground water that is currently being monitored. <br />The alluvial piezometers showed water levels lower than prior years <br />average except during April when the water levels were slightly <br />higher. The low water level in the piezometers reflects the lack of <br />run-off reaching the sediment pond possibly because of the good <br />vegetative cover that has established on site: The higher level in <br />April might be explained by snowmelt reaching the pond and increasing <br />the water level in the alluvium. <br />MINE WATER <br />The underground workings were not accessible <br />monitoring in 1992 nor will they be accessible in <br />water level in the mine is projected to stabilize <br />according to the Kaman Tempo Report, Volume 8 of <br />application. For a projection of the mine filling <br />refer to the 1987 Annual Hydrologic Report. <br />• CONSUMPTIVE USE <br />None. <br />for mine inflow <br />the future. The <br />below the portal <br />8 of the permit <br />schedule, please <br /> <br />