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Third 4ihite Sandstone aquifer well GP9 field pH values are • <br />typically near neutral. <br />The alluvial (P1), Lewis Shale (P3), Seco~ad White (P5), and <br />Third White Sandstonei(PS) wells in Pyeatt Gulch all contain water <br />with fi~;ld pH that is; generally near neutral. <br />The 1991 values~,for well J1 were near neutral. The 1991 pH <br />value for the COY well was neutral. The field ]>H values for well <br />81-03a have been near'8.5, while the pH values fir the GLUX-1 well <br />are near 8.0. <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 Pa@e B-75. The SAR • <br />values measured for water from well GA1 and GA'? are low with an <br />average value of approximately 0.3. SAR values fir water from well <br />GB2 are typically slightly less than one. The SAR from well GB5 <br />was typically less than 10 prior to 1985. The East six years have <br />seen an increase in the SAR value to its 1991 value of 28. <br />The SAR of water from wells GC1, GC2 acid GC3 have been <br /> <br />typically near 2. No definite trends are shown by the data. <br />The Twenty Mile Sandstone water (well GD1) has had variable <br />SAR values from PJ.5 to 4.5. A trend does not exist, but some of <br />the variation could have been affected by the length of pumping <br />prior to sampling. The SAR from well GD2 has generally been close <br />to 0.5. Backfill well GD3 seems to contain water with a similar <br />SAR value. <br />• <br />3-1H <br />