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approximately 9. The pH values for well GE3 showed a slight <br />decrease from 1992 values to 6.8-7.3 in 1993. <br />Twenty Mile Sandstone well GF1 generally contains water with <br />a pH near neutral, while the U aquifer well (GF2) and KLM aquifer <br />well (GF3) at this site contain eater with a pH of approximately <br />8.5. A slightly higher pH (near 9) has been observed for the HI <br />aquifer at well GF4. All three backfill wells, GF5, GF7, and GF11, <br />have field pH values near neutral. The field pH in well GF6 (QR) <br />is also near neutral. <br />Well GP1 (QR) has water with pH values above neutral, while <br />well GP2 (KLM) water is generally near neutral. The field pH <br />values for wells GP3 and GP4 have shown little change for water <br />collected from the HI and KLM aquifers, respectively. Well GP3 has <br />had pH values near neutral, while values for well GP4 have been <br />slightly less than 9. <br />Wells GP5 and GP6 are completed in the QR aquifer. The field <br />pH values from well GP5 are generally near a value of 8.6, while <br />the pH from well GP6 is generally above 7. <br />HI aquifer well GP7 has typically had water with field pH <br />values slightly above 7. Well GP8 (KLM) has water with a pH of <br />near 8. The 3rd White Sandstone aquifer well GP9 field pH values <br />are typically near neutral. <br />The alluvial (P1), Lewis Shale (P3), 2nd White (P5), and 3rd <br />White Sandstone (P8) wells in Pyeatt Gulch all contain water with <br />field pH that is generally near neutral. <br />u <br />3-10 <br />