REP16717

• Permit No: C1981034
• IBM Index Class Name: Report
• Doc Date: 11/30/1994
• Doc Name: 1994 ANNUAL HYDROLOGIC REPORT
• Annual Report Year: 1994
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

•

MINREC, INC., RED CANYON MINE
~pc. rV q-~Y~Q ~~ 1994 ANNUAL HYDROLOGIC REPORT
HYDROLOGIC YEAR 10/93 - 9/94
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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 - 1993
reports. Monitoring values are compared with the average of
previous values for the same month which generally include
monitoring results from 1981 through 1993. The averages shown in
this report are slightly different from prior years reports because
the 1993 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 5-94 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 flow in Ward Creek was less than
prior years averages.
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.
The Division's letter dated March 3, 1994 requested that Minrec
sample and analyze Ward Creek for Total Dissolved Solids (TDS), and
the main anions and cations to allow comparison of current
conditions to conditions predicted in the PHC in regards to
salinity and TDS. The predicted values are presented in the Kaman
Tempo Report on pages 68 and 69. The report states that prior to
mining, Ward Creek had an average TDS concentration of 214 mq/1 and
an average SAR of 0. 9.
Minrec sampled Ward Creek for TDS and SAR during the low flow
period in September 1994. Upstream Ward Creek had a TDS value of
60 mg/1 and an SAR value of 0.67. Downstream Ward Creek had a TDS
value of 105 mg/1 and an SAR value of 1.02. This sampling
confirms that the Red Canyon Mine has not had an adverse impact on
the quality of water in the creek.