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for 1985 and 1986 compare well with values in 1975-1977 when the well was <br />consistently used. <br />Figure 4.8-31 shows a steady TDS concentration plot for well GF1, a Twentymile <br />Sandstone well. TDS concentrations for this well have not varied as the Twentymile <br />at well GD1 has. A fairly steady concentration would be expected of a deep aquifer <br />as the Twentymile Sandstone. The concentration plot from well GF1 is thought to be <br />more typical of this aquifer. The TDS value for December of 1982 is thought to be a <br />lab error because the DSSUM indicates a TDS similar to the remainder of the values. <br />Twentymile Sandstone well GD1 had a significant increase in pH in 1984. Field <br />pH values are presently back to levels that are expected and that were present for <br />i <br />the first several years from this well. The recent <br />pH values <br />are thought to be more <br />representative of the aquifer water because well GD1 <br />has been <br />pumped consistently in <br />the last two years. Twentymile Sandstone well GF1 generally contains water with a <br />pH near neutral. <br />SAR values for the Twentymile Sandstone water from well GD1 has had variable <br />SAR values from 0.5 to 4.5. A trend of these values does not exist but some of the <br />variation could have been affected by the length of pumping prior to sampling. SAR <br />has generally been below 1 for well GF1. <br />U AQUIFER <br />The TDS for well GF2 has also been steady (see Figure 4.8-32). This well is <br />completed in the U aquifer below the R coal seam. The December, 1982 value is <br />• <br />4-233w REVISED- FOk 13'00-17 <br />