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show the natural increase in TDS as water moves downgradient in <br />this aquifer. <br />Wells GP7 and GP8 were installed in 1985 to monitor the HI <br />and KLM aquifers in the easternmost part of the Trapper Mine <br />permit area. Figures H-2H and 8-29 present plots of the TDS <br />versus time data for the respective wells. TDS has remained <br />fairly steady for each well. The Third White Sandstone is <br />monitored by well GP9 in the eastern part of the Trapper permit <br />area. TDS concentrations have been steadily increasing in water <br />from the Third White Sandstone near well GP9. All the GP series <br />wells, except GP3, GP4, GPS and GP6, are at least two miles from <br />active mining, while wells GP3 through GP6 are at least 1500 feet <br />from present active mining. Fluctuations in concentrations are <br />• thought to be within the natural range of change for these <br />aquifers at these wells and are not presently influenced by <br />mining activity. <br />The TDS concentration from Pyeatt alluvial well P1 has <br />gradually increased in the last four years. Recent <br />concentrations are closer to those values measured prior to 1984. <br />The base flow in the Pyeatt Gulch has gradually decreased in the <br />last few years and the percentage of the alluvial water near P1 <br />which is contributed from the Lewis Shale probably has increased. <br />This increase would cause a natural increase in the TDS in the <br />alluvium in this area. Values for the first three quarters of <br />1988 are significantly lower, but correlate with higher flows in <br />Pyeatt Gulch during 1988. The TDS for water from the Lewis Shale <br />well P3 has varied considerably. Water quality in a shale <br />3-7 <br />