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<br />near 2. No definite trends are shown by this data. <br />The Twenty Mile 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 <br />but some of the variation could have been affected by the length of <br />pumping prior to sampling. The SAR from well GD2 has generally been <br />close to 0.5. <br />The early SAR values from well GE1 were close to 20 while the <br />• <br />more recent values have ranged from 8 to 14. The change in SAR values <br />could be caused by an increased rate of movement of ground water in <br />this area due to the drawdowns. These SAR values with the TDS of this <br />water should not make irrigation prohibitive for most soils. SAR <br />values from well GE2 have varied from 3.6 to 40. The value of 96 for <br />1987 is significantly higher than normal. More data is needed with <br />time to determine if a significant increasing trend exists. A similar <br />large variation of values from well GE3 have also been observed. <br />SAR has generally been below 1 for well GF1 and above 30 and 40 <br />r1 <br />LJ <br />at wells GF2 and GF3, respectively. These values are thought to be <br />representative of natural conditions in the aquifer. SAR values for <br />well GF3 from 1986 to 1987 are significantly higher than past values. <br />The SAR values for GF2 and GF3 could create a problem for irrigation <br />of tight soils. Water from well GF4 and GFS also containc high SAR <br />values. The SAR value for water from well GF6 has declined gradually <br />and additional monitoring with time is needed to establish a good mean <br />3-11 <br />