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III III11tIIIIIIIIII MINREC, INC., RED CANYON MINE <br />-_ 1992 ANNUAL RYDROLOGIC REPORT ~ jbc/U-4+~'~~ <br />~cc.~l~: ~b~jd 194 a- NYDROLOGIC YEAR 10/91 - 9/92 <br />The reclamation of the Red Canyon mine site was performed during 1988. <br />A vegetation study performed during 1992 demonstrated that the <br />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 was <br />discharged from the site during the year. <br />This year's report is formatted the same as the 1987 - 1991 reports. <br />Monitoring values are compared with the average of previous values for <br />the same month which generally include monitoring results from 1981 <br />through 1991. The averages shown in this report are slightly <br />different from prior years reports because the 1991 monitoring results <br />are included in the averages. <br />Current monitoring requirements are shown on pages 144 and 144a of the <br />Permit. The location of the monitoring sites is shown on Map <br />2.05.6(3)-1. <br />SURFACE WATER <br />Table 5-92 shows the surface water monitoring results for this water <br />• year compared to the averages of previous years monitoring results for <br />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 lower than prior years averages. However, the measured <br />flow at Upper ward Creek of 7.5 cfs, was about equal to the flow <br />measured during the years 1988 - 1990. <br />The late season flow in the creeks is augmented by reservoir <br />discharge. The September flow in Ward Creek was relatively close to <br />its historic average. <br />There does not appear to be any impact on Ward Creek from the <br />abandoned mine. <br />The hydrologic monitoring program requires the sampling of springs SP- <br />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 historical <br />average during both May and September. In May the conductivity of SP- <br />3 was higher than its historical average but less than the historical <br />high of 666 umhos/cm. In September the conductivity of SP-3 was <br />almost equal to its historical average. The pH of the spring water, <br />both SP-1 and SP-3, is within an acceptable range but somewhat higher <br />that historical averages. <br />• <br /> <br />