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III IIIIIIIIIIIII III <br />DEPARTMENT OF NATURAL RESOURCES <br />Devitl H. Getchea. Esecuhve Director <br />MINED LAND RECWMATION DIVISION <br />DAVID f. SHELTON, DlneLOr <br />Richard D. Lamm <br />Governor <br />March 10, 1986 <br />Mr. Scott Jones <br />Environmental Engineer <br />Snowmass Coal Compny <br />P.O. Box 980 <br />Carbondale, Colorado 81623 <br />Re: Review of Annual Hydrologic Report for Water Year 1985, North Thompson <br />Creek Mines - File No. C-81-025 <br />Dear Mr. Jones: <br />Mr. Dale Plume and I have reviewed the above-referenced report. The report is <br />well organized, concise, and contains most informational requirements. <br />Presented below is a brief discussion organized according to the format of the <br />report. Any comments requiring a response from the operator are numbered. <br />Surface Water Quality <br />• 1. As you discussed with Candace Thompson on February 20, 1986, the last <br />quarter sampling of 1985 was not included in the Hydrologic Report. This data <br />needs to be included in the report. <br />2. The Division understands that sulfate analysis was left off the <br />laboratory request list for the middle two quarters of 1985. Snowmass Coal <br />needs to contact the laboratory and ensure that sulfate analysis is included <br />on all quarterly analyses for the future. <br />For your information, analysis of the discharge from the peat bog treatment <br />gave the following results in the summer of 1985. <br />TDS 4400 mg/1 <br />Mg 390 mg/1 <br />Ca as Ca Cog 1390 mg/1 <br />SOq 3380 mg/1 <br />These elevated levels correspond to the unusually high levels of these <br />parameters in the August 8, 1985 analysis of the North Thompson Creek <br />downstream site. _ <br />Ground Water Quality <br />No significant water quality trends are noted for the ground water monitoring <br />• wells, however, data that indicates sharp fluctuations in water quality and <br />water levels are still evident in Hole No. M-1. Although this well's <br />fluctuations are similar to seasonal variations seen in other well at the <br />mine, Hole No. M-1 variability is of a greater magnitude. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />