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Tom Gillis - 2 - April 4, 1985 4. There are certain trace metals and ions which indicate, at certain locations, that concentrations were very low or below detection level. The operator should review at least two years of data, while in operation, to determine the necessity of future analyses for certain trace elements or ions. Ground Water Data 1. Ground water quality appears to be good for the coal seam and alluvial wells from the data submitted. However, the refuse pile data indicated high TDS and EC levels, this is to be expected in most cases. Again, the discharge or runoff from the refuse piles is the cause for the high TDS and EC values at SP-B. 2. Again, data should be reviewed to determine the feasibility of future analyses of certain trace elements. Mine Water 1. Mine inflows were accurately located and described. Mine discharge volumes were reported from measured data or estimates during times of flowmeter failure. 2. It is stated that the calculated mass average conductivity may be in error due to a sampling error. If this is due to a sampling procedure, the operator should correct sampling procedures, if feasible, to prevent errors in the future. Consumptive Use Data 1. Water is purchased and metered at present from Coalby Domestic Water Company. An augmentation plan has been approved for 15 gpm, this water right has not yet been developed. The Division should be informed when development will occur. Groundwater Data 1. The maps submitted, accurately depict sample locations and monitoring stations. The data compiled is submitted in an accurate and easily understood format, which indicates water levels and quality. 2, Data indicates that TDS and EC readings are high at certain locations. Specifically, these readings relate to high sodium bicarbonate waters, sulfate and trace metals which, in general, are low for the coal seams. Alluvial aquifers also have sodium bicarbonate waters but in lower concentration that bedrock aquifers. 3. The refuse pile water quality is poor with acidic pH and very high TDS calcium bicarbonate-sodium sulfate water. Iron and manganese concentrations are also high. Again, this is to be expected in coal refuse piles. The routing of any discharge from this pile should be through a sediment pond, and I believe that this occurs.