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r~ <br />U <br />the aquifer water because well GD1 has been pumped consistently in the <br />last two years. Field pH from well GD2 does not demonstrate a trend. <br />The upgradient mining in the QR aquifer has not affected the pH in <br />this area of the aquifer. Values from GE1 gradually declined for <br />several years and seem to have stabilized slightly above neutral. The <br />pH of water from well GE2 has varied from slightly less than 7 to <br />approximately 9. The pH values for well GE3 were similar through <br />1985, but have remained in a lower range of 7.6 to 8.6 since 1985. <br />Twenty Mile Sandstone well GF1 generally contains water with a pH <br />near neutral while the U aquifer well (GF2) and RLM aquifer well (GF3) <br />at this site contain water with a pH of approximately 8.5 with the <br />• November 1986 and September 1987 values being lower. A slightly <br /> higher pH (near 9) has been observed for the HI aquifer at well GF4. <br />Data from backfill well GFS indicates that the backfill water will <br />initially be slightly alkaline with a pH of 8 while the June and <br />September 1986 and September 1967 values were slightly lower. Well <br />GF6 contains water with a pH slightly greater than neutral. Backfill <br />well GF7, completed in September 1987, has only been sampled once and <br />had a pH of slightly above neutral. <br />The alluvial, Lewis Shale, Second White and Third White Sandstone <br />aquifers in Pyeatt Gulch all contain water with a pH that generally is <br />slightly above 7. <br />• The pH values for wells GP3 and GP4 have shown little change for <br />3-9 <br />