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• Detailed discharge measurements on the Yampa River showed that significant <br />groundwater discharges to the Yampa River do not occur (Machin, 979-Apendix N). <br />Overall, eight to nine cubic feet per second of wate/charge <br />Itfrom the river <br />into its alluvium. A small (two to eight cubic feet groundwater dis- <br />charge over a one mile stretch beginning two miles bighway 13 bridge <br />was indicated. Volume of this potential groundwater approached confi- <br />dence limits of the field techniques. <br />Pit -bottom disposal should be avoided in the ext eme northern ends of the mine <br />pits, as waste saturation is most likely to be a countered at the northern end of <br />the pit bottoms. Waste should not be dispos d of below the water table. No <br />relatively small areas of the mine have suf ciently greater disposal suitabili- <br />ties from a hydrological point to warrant ncentrated disposal in those areas as <br />opposed to disposal throughout the mine. Shallow waste disposal should not be <br />practiced in existing drainages. <br />A recent inventory of water wells t the vicinity of the Trapper Mine was con- <br />. ducted by Utah International, Inc This inventory indicates that a number of <br />water wells are present in the ea. The total number of water wells found in <br />T6N, R91W is about 50, but most of these wells are located in Craig South High- <br />lands. About thirteen bedroc wells and two alluvial wells could potentially be <br />affected by waste disposal, f contaminated groundwater leaves the disposal area. <br />These wells are as follows• <br />4-93 <br />