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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, 1979-Apendix N). <br />Overall, eight to nine cubic feet per second of water were lost from the river <br />into its alluvium. A small (two to eight cubic feet per second) groundwater dis- <br />charge over a one mile stretch beginning two miles below the Highway 13 bridge <br />was indicated. Volume of this potential groundwater discharge approached confi- <br />dence limits of the field techniques. <br />Pit-bottom disposal should be avoided in the extreme northern ends of the mine <br />pits, as waste saturation is most likely to be encountered a[ [he norChern end of <br />the pit bottoms. Waste should not be disposed of below the water table. No <br />relatively small areas of the mine have sufficiently greater disposal suitabili- <br />ties from a hydrological point [o warrant concentrated disposal in those areas as <br />opposed to disposal throughout the mine. Shallow waste disposal should no[ be <br />practiced in existing drainages. <br />A recent inventory of water wells in 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 area. 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 seven bedrock wells and two alluvial wells could potentially be <br />affected by waste disposal, if contaminated groundwater leaves the disposal area. <br />These wells are as follows: <br /> <br />4-93 <br />y~d ~ <br />