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3.4 SAR <br />The sodium-adsorption ratio (SAR) is tabulated on the second series of pages in <br />Table B-1. The SAR of water from wells GC-1, GC-2, and GC-3 have been typically near <br />2. No definite trends are shown by the data. <br />The Twenty Mile Sandstone water from well GD-1 (2) contains a SAR value of <br />slightly less than 1.0. The SAR from well GD-2 has generally been close to 0.5. Backfill <br />well GD-3 contains water with a similar SAR value. <br />The average SAR values from well GE-1 for 1997 was 14. SAR values from well <br />GE-2 have varied from 3.6 to 152 with a 1997 value of 49. A large variation of values from <br />well GE-3 has also been observed with the most recent value at 3.3. <br />SAR has generally been below one for well GF-1 and at 36 and 62 for wells GF-2 <br />and GF-3 in 1997. These values are thought to be representative of natural conditions in <br />these aquifers at this location. The SAR values for GF-2 and GF-3 could create a problem <br />for irrigation on tight soils. Water from well GF~3 and GF-5 also contains high SAR values. <br />The SAR value for water from well GF-6 has varied from 0.34 to 6.2. Backfill well GF-7 <br />has exhibited SAR values between 7 and 23 with a most recent value of 9.5. Data from <br />Backfill well GF-11 shows a low value at less than one. <br />SAR values for wells GP-1 and GP-2 were 20 and 3.9 in 1997. SAR values for <br />well GP-3 are less than 2, while values from well GPI are generally between 50 and 100. <br />Well GP-5 has had SAR values from 22 to 81. SAR values for well GP-6 have <br />been below 4 for the last ten years. The SAR values from well GP-7 are below 1, while the <br />• <br />3-10 <br />