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• <br /> 3.4 SAR <br /> The sodium-adsorption ratio (SAR) is tabulated on the second <br />•. series of pages in Table B-1, starting on Page B-69: The SAR <br /> values measured for water from well GA1 and GA2 are low with an <br /> average value of approximately 0.3. SAR values for water from <br /> well GB2 are typically slightly less than one. The SAR from well <br /> GB5 was typically less than 10 prior to 1985. The present SAR <br /> value is significantly higher at 42. <br /> The SAR of water from wells GC1, GC2 and GC3 have been <br /> typically near 2. No definite trends are shown by this data. <br /> The Twenty Mile Sandstone water from well GD1 has had <br /> variable SAR values from 0.5 to 4.5. A trend of these values does <br />• not exist, but some of the variation could have been affected by <br /> the length of pumping prior to sampling. The SAR from well GD2 <br /> has generally been close to 0.5. Backfill well GD3 seems to <br /> contain water with a similar SAR value. <br /> The early SAR values from well GE1 were close to 20, while <br /> most of the more recent values have ranged from 4.8 to 14. The <br /> change in SAR values could be caused by an increased rate of <br />movement of ground water in this area due to the early drawdowns <br />and recent recovering water levels. These SAR values with the TDS <br />of this water should not make irrigation prohibitive for most <br />soils. SAR values from well GE2 have varied from 3.6 to 152. <br />Although the .1989 SAR of 152 was noticeably higher, the 1990 value <br />of 28 was about average. A large variation of values from well <br />• GE3 has also been observed with the most recent value low. <br />3-12 <br />