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n U MINREC, INC., RED CANYON MINE 1991 ANNUAL HYDROLOGIC REPORT HYDROLOGIC YEAR 10/90 - 9/91 The reclamation of the Red Canyon mine site was performed during 1988. Sedimentation control for the site is accomplished with a sediment pond and the use of alternate sediment control for a small area exemption. Both systems worked effectively during the year. No run-off water was discharged from the site during the ,year. This year's report is formatted the same as the 1987, 1988, 1989 and 1990 reports. Monitoring values are compared with the average of previous values for the same month which generally in- clude monitoring results from 1981 through 1990. The averages shown in this report are slightly different from prior years reports because the 1990 monitoring results are included in the averages. As a result oi' a technical revision approved September 5, 1989, required hydrologic monitoring of the area around the mine • site has been reduced. 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(31-1 The ne~a monitoring program ,cent into effect during the 1990 water ,year. SURFACE WATER Table S-91 shows the surface water monitoring results for this water year compared to the averages of previous ,years monitoring results for the same month. According to the local irrigation office, 1991 was a below average year for snowpack and run-off. However, the 1991 water year produced more run-off than the three prior years. The land owners are still hoping for an above average year to make up for the prior three dry years. 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 lower than prior years averages. However, the measured flow at Upper Ward Creek of 12.3 cfs was nearly double the flow measured during the prior three years. The late season flow in the creeks is augmented by reservoir discharge. The September flow in Ward Creek was low but about • what would be expected for a dry year and the flow was relatively close to its historic average.