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• iiiiu-iiiiiiiii-ii ~ <br />STATE OF COLOKADO <br />MINED LAND RECLAMATION DIVISION <br />Department o1 Nawral Resources <br />1313 Sherman St . Roum 2t5 <br />Denver. CO 80203 <br />303 6663567 <br />Fn%: 303 832 8106 <br />January 18, 1990 <br />Mr. James Stover <br />Minerec, Inc. <br />773 Valley Court <br />Grand Junction, CO 81505 <br />Re: North Thompson Creek Mine (Permit No. C-81-025) <br />1989 Annual Hydrologic Report <br />Dear Mr. Stover: <br />pF Cp~~A <br />t, <br />•I\ ~- 1U <br />~ /e ]6 ~ <br />Rpv Romer. <br />Governor <br />Fred R 6anra <br />Davison D rector <br />The Division has reviewed the Hydrologic Report covering the period October 1, <br />1988 to September 30, 1989, received by this office on January 2, 1990. The <br />format, with graphs and historical data, provides a very readable report. <br />The surface water samples from North Thompson Creek show somewhat higher Total <br />Dissolved Solids than in the 1988 samples. This may due to sampling during <br />times of relatively lower discharge. The dissolved iron concentrations were <br />elevated in both upstream and downstream samples, indicating that there are <br />significant sources of iron in North Thompson Creek besides the mine. Other <br />constituents were also hioher in the 1989 samples (sulfate, calcium, and <br />magnesium), possibly due to sampling during lower flows. <br />Water levels in the two piezometers remain stable, as they have been in the <br />past. It was noted that results from the June, 1989 sampling period were <br />missing from the report for both wells. Please let me know if these samples <br />were not taken, or if they were why the data was omitted. The a.uality of this <br />alluvial water, based on field conductivity measurements, was stable to <br />slightly hioher in 1989. <br />Please call or write if you have any questions. <br />Sincerely, <br />William B. Crick <br />Reclamation Specialist <br />WBC/ern <br />cc: F1ike Savage <br />31 77F <br />