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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />MINED LAND RECLAMATION DIVISION <br />Depanmem of Nawral Resource <br />1313 Sherman S~ . Roum 215 <br />Denver. CO 80203 <br />303 8663567 <br />Fn%.303 832-8106 <br />January 18, 1990 <br />tor. James Stover <br />t4inerec, Inc. <br />773 Valley Court <br />Grand Junction, CO 81505 <br />Re: North Thompson Creek I-0ine (Permit No. C-81-025) <br />1989 Annual Hydrologic Report <br />Dear Mr. Stover: <br />pF Cf~,r <br />4, A <br />~, .M~ ~9G <br />.~ . ~ <br />.1 L ~ <br />i. <br />~ rN]b <br />Rov Roniei <br />Governo' <br />F retl R Bama <br />Dwision D:reaor <br />The Division has reviewed the Hydrologic Report covering the Deriod 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 higher 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 Duality of this <br />alluvial water, based on field conductivity measurements, was stable to <br />slightly higher in 1989. <br />Please call or write if you have any questions. <br />Sincerely, <br />~2~~~.-- ~ ~~~~~ <br />William B. Crick <br />Reclamation Specialist <br />tJBC/ern <br />cc: t•like Savaoe <br />31 77F <br />