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pH in 1984. Field pH values are presently back to levels that <br />• are expected and that were present for the first several years <br /> from this we ll. The recent pH values are thought to be more <br /> representative of the aquifer water because well GD1 has been <br />pumped consistently in the last four years. Field pH from well <br />GD2 does not demonstrate a trend. The upgradient mining in the <br />OR aquifer has not affected the pH in this area of the aquifer. <br />The pH values from backfill well GD3 are near neutral. Values <br />from GEI gradually declined for several years and seem to have <br />stabilized slightly above neutral. The pH of water from well GE2 <br />has varied from slightly less than 7 to approximately 9. The pH <br />values for well GE3 were similar through 1985, but have remained <br />in a lower range of 7.6 to 8.6 since 1985. <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 (GFS> at this site contain water with a pH of approximately <br />B.5 with the November 1986, September 1987 and March 1988 values <br />for well GF3 being lower. A slightly higher pH (near 9) has been <br />observed for the HI aquifer at well GF4. Data from backfill well <br />GFS indicates that the backfill water will initially be slightly <br />alkaline with a pH of near 8, while the June and September 1986 <br />and September 1987 values were slightly lower. Well GFb contains <br />water with a pH slightly greater than neutral. Backfill well <br />GF7, completed in September 1987, has shown pH values near <br />neutral at 7.7, with the September 1988 value slightly lower. <br />Backfill well GF11 was installed in July 1988 and has only two <br />• analyses. Values for pH of water from well GF11 are slightly <br />below neutral at 6.7. <br />3-IB <br />