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Third White Sandstone aquifer well GP9 field pH values are • <br />typically near neutral. <br />The alluvial (P1), Lewis Shale (P8), Second White (P5), and <br />Third White Sandstone (P8) wells in Pyeatt Gulch all contain water <br />with field pH that i.s generally near neutral. <br />The 1992 values for alluvial wells .J1 and COY were near <br />neutral. The field pH values for well 81-03a have been near 8.5, <br />while the pH values ,for the GLUX-1 well are near 8.0. <br />3.4 SAR <br />The sodium-.adsorption ratio (SAR) is tabulated on the seconrl <br />series of pages in Table B-?, starting on Pae:e B-77. The SAR <br />values measured fer water from well GA1 and GA2 are low with an • <br />average value of a few tenths. SAR values for water from well GB2' <br />are typically slight,:ly less than one. The SAR from well GB5 was <br />typically less than 10 prior to 1985. The last seven years have <br />seen an increase in the SAR value to its 1992 value of 26. <br />The SAR of water frorn wells GC1, GC2 and GC3 have been <br />typically near 2. No definite trends are shown by the data. <br />The Twenty Mi1e~ Sandstone water (well GDi) has had variable <br />SAR values from O.5 to 4.4. A trend does not exist. but some of <br />the variation could have been affected by the length of pumpine. <br />prior to sampling. The SAR from well GD2 has generally been close <br />to 0.5. Bar_k£i11 well GD3 seems to contain water with .a similar <br />SAR value. <br />The early SAR v:slues from well GE1 were close to 20, while the • <br />3-10 <br />