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III IIIIIIIIIIIII III MINREC, INC., RED CANYON MINE ~. sss ~c/~A'(Me~j 1993 ANNUAL HYDROLOGIC REPORT DocDate:- ~ ~I30~ 1993 HYDROLOGIC YEAR 10/92 - 9/93 The reclamation of the Red Canyon mine site was performed during 1988. A vegetation study performed during 1992 demonstrated that the vegetation on the mine site was adequate to control erosion. Therefore, the sediment pond and the alternate sediment control for the small area exemption are no longer required. No run-off water was discharged from the site during the year. This year's report is formatted the same as the 1987 - 1992 reports. Monitoring values are compared with the average of previous values for the same month which generally include monitoring results from 1981 through 1992. The averages shown in this report are slightly different from prior years reports because the 1992 monitoring results are included in the averages. Current monitoring requirements are shown on pages 144 and 144a of the Permit. The location of the monitoring sites is shown on Map 2.05.6(3)-1. SURFACE WATER • Table S-92 shows the surface water monitoring results for this water year compared to the averages of previous years monitoring results for the same month. Spot flow readings taken in May will vary because of the timing and intensity of snow melt. The May flows in Ward Creek were substantially greater than prior years averages. The flow in both the upstream (4' flume) and the downstream gauge was above their calibrated limits. This indicates that the area had a good snowpack and a relatively quick run-off. The late season flow in the creeks is augmented by reservoir discharge. The September flow in Ward Creek was relatively close to its historic average. There does not appear to be any impact on Ward Creek from the abandoned mine Red Canyon Mine. 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. The conductivity of SP-1 was lower than its historical average during May. In May the conductivity of SP-3 was 630 uhmos/cm which is higher than its historical average but less • than the historical high of 666 uhmos/cm. In September the conductivity of SP-1 was 910 uhmos/cm which is greater than its historical average of 734 uhmos/cm but less than is historic high