REP29511

• Permit No: C1982057
• IBM Index Class Name: Report
• Doc Date: 3/2/1993
• Doc Name: 1992 ANNUAL HYDROLOGY REPORT TEXT
• Annual Report Year: 1992
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

• tower then normal snowpacks in the vicinity during the last six years. An exception to
this would be the water levels et alluvial wells 6A1 to 6A3 which have shown higher water
levels due to recently introduced irrigation in that area.
Water Quality. Table 3 (Appendix A), Summery of Ground Water Monitoring Wells, describes
the wells that are sampled end et what frequency they are sampled. In 1992, samples were
collected from seventeen welts. In addition, four wells from which water samples are
required were either dry or had not enough water to sample.
Table 4 (Appendix A) shows the ground water parameter list used for all wells. Analyses
have been performed by pCZ Laboratory in Steamboat Springs, Colorado since Nay 31, 1983.
AC2 Laboratory performs all analyses by EPA or equivalent methods. Samples are delivered
the day of collection to the lab in an iced roofer. The following discussion of the
analytical data collected during the reporting period is arranged by strata being
monitored end coincides with the format (by aquifer type) in which the analytical data are
presented in Appendix D. Sampling techniques for each well are given in the remarks page
in the same appendix.
• Tables 5 to 7 (A
endix A) tabulate the
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ions and total dissolved solids (TDS) for each well sampled. All date prior to 1990 has
been averaged together to provide the baseline (i.e., premining) conditions that existed.
In addition, the range of total dissolved solids (TDS) that existed prior to mining is
also given. Since mining began in 1990, data from that point on is listed separately.
The following discussion of water quality wilt limit itself to a description of major
ions. A separate section, Comparison of Ground Wa[er Quality to Water Use Standards, wilt
list those samples that exceed water use standards.
Alluvium. Well bA2 displays a CaM gN a-HC03 type water with en average TDS values in 1992
of 732 mg/l. This is higher than the 611 mg/l baseline average, but falls within the
baseline range of 454 to 900 mg/l. This well exists in the Hubberson Gulch alluvium
upstream of mine discharges. [rri9ation of the pasture surrounding this well began Nay 6,
1989. All samples from this well collected after that date have had a higher TDS value
than samples collected prior to that date.
• Yell 7A2, located in the Hubberson Gulch alluvium downstream of mine discharges, displays
a CaNg-HC03 SO4 type water with an average TDS value in 1992 of 1,134 mg/l. This is higher
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