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water with a pH slightly greater than neutral. <br />The alluvial, Lewis Shale, Second White and Tk~ird White Sandstone <br />aquifers in Pyeatt Gulch all contain water with a pH generally <br />slightly above 7. The pH of water from U aquifer well GZ2 has <br />generally been between 6.5 and 7. <br />Table B-1 shows that the pH of wells GBB1 and GBB2 has been <br />elevated above the expected values while the values for the other GBB <br />well is normal. The bailing of well GBB1 caused the pH to drop <br />drastically. The pH of water from well GBB1 was gradually declining <br />during the pumping of the November sample. Addit:(onal pumping would <br />probably decrease the pH value to the true aquifer value. The very <br />low pumping rate (0.15 gpm) of well GBB1 would probably require the <br />length of continued pumping to be very long for the pH to stabilize. <br />The pH of water from well GBB2 was in the expected range during <br />the September sampling (see Table B-1 of Appendix B). Well GBB2 was <br />not mechanically bailed because its September results were normal. <br />Concentrations from well GBB2 in November of 1985 returned to their <br />abnormal levels. The September results are thought to be fairly <br />indicative of this aquifer's water quality. <br />• The pH of water from well GBB3 has been in the expected range. <br />The variations in pH of water from well GBB3 seem natural. The pH <br />values from alluvial wells J1 and Coy have been slightly above 7 and <br />seem to be stable. <br />3.3 SAR <br />The sodium-absorption ratio (SAR) is tabulai:ed on the second <br />series of pages in Table B-1, starting on page B-46. The SAR values <br />measured for water from well GA1 and GA2 are low with an average value <br />of approximately 0.3. SAR values for water from well GB2 are <br />typically slightly less than one. The SAR from wel]. GB5 has typically <br />been slightly less than 10. A definite trend in SAR is not <br />observable. <br />The SAR of water from wells GC1, GC2, and GC3 Y.~ave been typically <br />less than 2, slightly greater than 2, and approximately 2. No <br />definite trends are shown by this data. <br />The Twenty Mile Sandstone water from well GD7. has had variable <br />SAR values from 0.5 to 4.5. A trend of these values does not exist. <br />The SAR from well GD2 has generally been close to 0.5. <br />• <br />3-5 <br />