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DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SNELTON, Director <br />Richard D. Lamm <br />Governor <br />May 8, 1985 <br />Mr. Scott Jones <br />Environmental Engineer <br />Snowmass Coal Company <br />P.O. Box 980 <br />Carbondale, Colorado 81623 <br />RE: Review of Annual Hydrologic Report for Water Year 1984, North Thompson <br />Creek Mines - Fire No. C-025-81 <br />Dear Mr. Jones: <br />The Division has reviewed the above-referenced report. The report is well <br />organized, concise, and contains all informational requirements. Presented <br />below is a brief discussion organized according to the format of the report. <br />Any comments requiring a response from the operator are numbered. <br />Surface Water Quality <br />Frequency of sampiing and chemical parameter analysis are in compliance with <br />Section 3.6.1.3 of the permit application document. No definable trends were <br />noted in surface water quality from upstream to downstream sites or with time <br />for either. North Thompson Creek or the Roaring fork River. The discussion <br />provided by the operator adequately describes the minor observed water quality <br />variations. <br />For each of the four surface water quality sampling sites, quarterly data from <br />water year 1984 are compared to pre-permit mean values. The following <br />suggestions are included for future reporting. <br />1. For clarification purposes, the number of pre-permit samples used <br />to generate the mean values should be given, and the location of <br />this data (i.e., permit application document, mine files, published <br />report, etc.) should be indicated by reference. <br />2. Field measurements of sample pH, conductivity, flow and temperature <br />should be included with the other water quality data in the annual <br />report to facilitate review of the data. <br />Ground Water Quality <br />No significant water quality trends are noted for the ground water monitoring <br />wells with the exception of Hole No. 1, which has shown an increase in Total <br />;~ Dissolved Solids (TDS) from a pre-permit mean of 1427 mg/L to 7030 mg/L on <br />May 30, 1984. This increase is due to increases in calcium, magnesium, sodium <br />and sulfate. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />