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<br /> <br />' (see Figure B-22). <br />The TDS concentration from Pyeatt alluvial weal P1 has gradually <br />' increased in the last three years. Recent concentrations are still <br />significantly less than the values prior to 1984. The base flow in <br />the Pyeatt Gulch has gradually decreased in the last two years and the <br />percentage of the alluvial water near P1 which is contributed from the <br />' Lewis Shale probably has increased. This increase would cause a <br />natural increase in the TDS in the alluvium in this area. The TDS for <br />1 water from the Lewis Shale well P3 has varied considerably the last <br />' three years. Water quality in a shale aquifer as the Lewis Shale <br />would be expected to contain high concentrations at times. TDS <br />' concentration in the Second White Sandstone well (PS) has varied <br />concentrations with time (see Figure 8-253. This variation is <br />t probably caused by variable amounts of recharge. The TDS <br />' concentrations from the Third White Sandstone (P B) in this area have <br />been much more stable. Figure B-26 shows a gradual increase in <br />' concentrations with time, except for the August, 1'.83 value. <br />' Only a few TDS data values are available for alluvial wells J1 <br />and Coy. Figure B-27 indicates an increasing trend in TDS for the <br />' Johnson Gulch well, A declining trend had been observed in the Flume <br />Gulch well (Coy) until January 1986. TDS values for 1986 show a sharp <br />upward trend. Additional monitoring is needed to establish any long- <br />' term trends for either of these aquifers. <br /> <br />' 3-6 <br />