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• 1994 Annual Hydrologic Report Page 2 The hydrologic monitoring program requires the sampling of springs SP-1 and SP-3 for flow, pH and conductivity twice each year. This monitoring is done to determine if the quality of the springs is impacted by water which may seep into the alluvium from the flooded mine workings. In May and September the conductivity of SP-1 was 820 and 860 uhmos/cm respectively. Both values are higher than the historical average of 734 uhmos/cm but lower than the historic high of 990 uhmos/cm. In May the conductivity of SP-3 was 670 uhmos/cm which is higher than its historical average and slightly greater than the historical high of 666 uhmos/cm. In September the conductivity of SP-3 was 630 uhmos/cm which is greater than its historical average of 591 uhmos/cm but less than the historic high of 666 uhmos/cm. The pH of the spring water, both SP-1 and SP-3, is within an acceptable range. The enclosed graph shows that the conductivity of spring SP-1 has consistently been below its historic maximum during the period 1989 through 1994. For Spring SP-3, the enclosed graph shows that its conductivity has consistently been above its historic average and below its historic maximum except during 1993 when the measured conductivity of SP-3 was about 12$ greater than it historic maximum. • The hydrologic monitoring program provides for monitoring to determine if run-off from the mine site has any impact on the water quality in the Carbon Ditch. SP-D is the upstream monitoring point and SP-DA is the downstream monitoring point on the Carbon Ditch. SP-D is located on the Carbon Ditch at a point that would not be impacted by surface run-off from the mine site. SP-DA is located downstream on the Carbon Ditch at a point that could be impacted by surface run-off from the mine site. Both points are monitored during May and September for field parameters and total suspended solids, (TSS). In May the TSS for SP-D and SP-DA was 370 and 410 respectively. In September SP-D was dry. The TSS. measurement taken in May indicates that no significant degradation of the quality of flow occurred on this stretch of the Carbon Ditch. The sediment pond did not discharge during the year. The pond did not have any signi~i \ nt amount of water in it during the year. A "spring" was notedlis t e northeast corner of the pond. During May the pH and conduct}'vit of the Spring was measured (ph = 7.9 cond = 1800 uhmos/cm). Vlu ing September the "spring" was just a damp spot so no water same a could be taken. I~ ~ ~ P 1 , D D ~ C , I,1 ~-O GROUND WATER fl I Table G-94 shows the ground water monitoring results for this water • year compared to the averages of previous monitoring results for the same months. The alluvial piezometers (P-1 & P-2) showed water levels consistent with prior years averages.