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