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.:, <br />• Mr. Scott Jones - 2 - May 8, 1985 <br />3. The operator's explanation for this increase in TDS since <br />pre-permit monitoring should be expanded to include a discussion of <br />why water quality has changed with time. What is the precise <br />nature of the well completion and how might this be affecting water <br />quality (i.e., is ground water from the Rollins Sandstone being <br />allowed to react with the Mancos Shale due to the nature of the <br />well completion)1 Also, is proper evacuation of the well volume <br />occurring prior to sampling so that a representative sample of the <br />formation water can be collected? <br />4. As with comment No. 2 above, field water quality results for the <br />ground water wells should be presented in the annual report. <br />Water quality results for Holes D-lA and D-2A near the refuse pile indicate <br />that the refuse pile is having no measurable affect on alluvial ground water <br />quality. Similarly, no definable trends exist in water quality data results <br />for the three loadout wells. <br />Ground Water Levels <br />No information on ground water levels has been presented in the annual <br />• report. As indicated on page 11 of the Proposed Decision and Findings of <br />Compliance document (dated July 14, 1983) for the North Thompson Creek Mines, <br />water level monitoring for both bedrock and alluvial aquifers is part of the <br />monitoring plan. <br />5. Snowmass Coal Company needs to submit water level monitoring data <br />for the 1984 water year along with a summary of previous years' <br />monitoring data. In order to facilitate review by both the <br />Division and the operator, it is recommended that water level data <br />for each site be plotted with time to enable efficient evaluation <br />of any trends. <br />Impacts <br />Mine inflow studies for the No. 1 and No. 3 mines were performed twice during <br />the year, in the fall (11/83) and early summer (6/84). No comments or <br />problems are noted with the studies or discussion presented in the report. <br />Anticipated Impacts <br />Snowmass Coal Company intends to provide a more complete description of <br />impacts in terms of mine inflow quantities, for the 1985 annual report, after <br />data has been collected from the flumes in Middle and North Thompson Creeks. <br /> <br />